CN221994673U - Battery cell, battery device, electricity utilization device and energy storage device - Google Patents

Abstract

The application provides a battery monomer, a battery device, an electricity utilization device and an energy storage device, and belongs to the technical field of batteries. Wherein, the battery cell includes a housing, an electrode assembly, and an insulating member. The wall of the housing is provided with a pressure relief member. The electrode assembly is disposed within the housing. The insulating part is arranged between the wall part and the electrode assembly, and a first groove is arranged at the position, facing one side of the wall part, of the insulating part and corresponding to the pressure release part. The wall sets up the second recess towards one side of electrode assembly, the second recess includes first slot segment and a plurality of second slot segment, first slot segment extends along first direction, the part of the projection of first slot segment on the thickness direction of wall portion is located first recess, a plurality of second slot segments are arranged along first direction interval, a plurality of second slot segments all communicate with first slot segment, and the extending direction of second slot segment intersects with the extending direction of first slot segment, the extending direction of first direction and second slot segment all is perpendicular to the thickness direction of wall portion, thereby can increase the inside exhaust path of battery monomer.

Description

Battery cell, battery device, electricity utilization device and energy storage device

Technical Field

The application relates to the technical field of batteries, in particular to a battery cell, a battery device, an electric device and an energy storage device.

Background

In recent years, new energy automobiles have been developed dramatically, and in the field of electric automobiles, a power battery plays an important role as a power source of the electric automobile. Along with the great popularization of new energy automobiles, the demand for power battery products is also growing, wherein the battery device has higher requirements on the aspects of use reliability and service life as a core part of the new energy automobile.

In battery technology, in order to guarantee the security of battery monomer, generally set up the pressure release part that is used for releasing the internal pressure of battery monomer on the single shell of battery for pressure release part can actuate and split when the battery monomer takes place thermal runaway, in order to release the inside thermal runaway gas of battery monomer. However, the internal exhaust smoothness of the existing battery monomer is poor when thermal runaway occurs, so that the pressure release rate of the battery monomer is low, and the risk of ignition explosion and the like caused by untimely pressure release of the battery monomer is caused, which is not beneficial to improving the use reliability of the battery monomer.

Disclosure of utility model

The embodiment of the application provides a battery monomer, a battery device, an electricity utilization device and an energy storage device, which can effectively improve the use reliability of the battery monomer.

In a first aspect, embodiments of the present application provide a battery cell including a housing, an electrode assembly, and an insulator; the housing has a wall portion provided with a pressure relief member; the electrode assembly is disposed within the housing; the insulating piece is arranged between the wall part and the electrode assembly, and a first groove is formed in the position, facing one side of the wall part, of the insulating piece and corresponding to the pressure release part; wherein a second groove is provided along a thickness direction of the wall portion, the wall portion facing one side of the electrode assembly, the second groove including a first groove section and a plurality of second groove sections, the first groove section extending in a first direction, a portion of a projection of the first groove section onto the insulating member along the thickness direction of the wall portion being located in the first groove, the second groove sections are distributed at intervals along the first direction, the second groove sections are communicated with the first groove sections, the extending direction of the second groove sections is intersected with the extending direction of the first groove sections, and the extending directions of the first direction and the second groove sections are perpendicular to the thickness direction of the wall portion.

In the above-mentioned technical scheme, the inside of shell is provided with the insulating part, and the insulating part is located between wall and the electrode assembly, make the insulating part can play the effect of insulating division wall and electrode assembly, with reduce the short circuit risk between electrode assembly and the wall, wherein, one side of insulating part towards the wall is provided with the first recess that corresponds with the pressure release part, through set up the second recess on the surface of wall one side towards the insulating part, the second recess is provided with first slot section and a plurality of second slot section, and a plurality of second slot section is for arranging along the extending direction interval of first slot section and with the structure of first slot section intercommunication each other, so that a plurality of slot sections that have vertically and horizontally staggered are formed to make the second slot section, and the first slot section sets up to be located first recess in the projection on the thickness direction of wall, make when the battery monomer takes place thermal runaway, can gather to get into to the first slot section in the back through the thermal runaway gas between second slot section guide piece and the wall and get into after the first slot section, and then can carry out the thermal runaway through the thermal runaway section through the second slot section and carry out the thermal runaway through the thermal runaway section and the pressure release part through the first recess, the thermal runaway can be increased through the thermal runaway section and the thermal runaway can the inside the battery can be carried out the thermal runaway section through the second slot section and the thermal runaway section through the thermal runaway section has the thermal runaway section to the first through the section.

In some embodiments, the wall portion is provided with two second grooves on one side of the wall portion facing the electrode assembly in the thickness direction thereof, the two second grooves being located on both sides of the pressure relief member in the first direction, respectively.

In the above technical scheme, the wall portion all sets up the second recess in the pressure release part along the both sides of first direction for the thermal runaway gas that is located the both sides of first recess in first direction can be respectively through the second recess that corresponds entering back rethread pressure release part in the first recess release, is favorable to further increasing the inside thermal runaway gas's of battery exhaust route, thereby can further promote the inside exhaust smoothness of battery monomer, with promotion battery monomer decompression rate.

In some embodiments, the orthographic projection of the second recess does not overlap the orthographic projection of the pressure relief feature in the same plane perpendicular to the thickness direction of the wall portion.

In the above technical scheme, through setting up second recess and pressure release part to the structure that does not overlap at the thickness direction's of wall projection to reduce interference influence and stress influence between second recess and the pressure release part, be favorable to reducing the degree of difficulty that sets up second recess and pressure release part on the wall, and be favorable to alleviating the phenomenon that the pressure release part is damaged or structural strength descends.

In some embodiments, the second groove section extends along a second direction, a dimension of the second groove section in the second direction being greater than a dimension of the first groove section in the second direction, the second direction being perpendicular to the thickness direction of the wall portion and the first direction.

In the above technical scheme, through setting up the second slot section to the structure that extends along the second direction for the extending direction of second slot section and the extending direction mutually perpendicular of first slot section, the battery monomer that adopts this kind of structure can promote the regularity of second recess on the one hand, is favorable to reducing the shaping degree of difficulty of second recess, on the other hand makes the second recess both through first slot section with electrode assembly and the casing in the first epaxial clearance thermal runaway gas guide to first recess in, still can be through the second slot section with electrode assembly and the casing in the epaxial thermal runaway gas guide of second in the clearance to first recess, thereby can effectively promote the inside exhaust smoothness of battery monomer, with promote the pressure release rate of battery monomer.

In some embodiments, a first protrusion is formed at a position of the wall portion facing away from one side of the insulating member and corresponding to the second groove in a thickness direction of the wall portion.

In the above technical scheme, through the position that deviates from one side of insulating part and corresponds the second recess at the wall portion forms first arch for the second recess that sets up on one side of wall portion facing the insulating part is the structure that can form through the punching press, in order to form the second recess in one side of wall portion, and form first arch in the opposite side and the position that corresponds the second recess, the battery monomer that adopts this kind of structure can reduce the degree of difficulty that forms the second recess in processing on the wall portion, is favorable to promoting the free production efficiency of battery, and can reduce the influence to the structural strength of wall portion, in order to reduce the wall portion and appear cracking or deformation phenomenon in the use.

In some embodiments, a third groove is formed on one side of the wall facing the insulating member along the thickness direction of the wall, a second protrusion is formed on one side of the wall facing away from the insulating member and corresponding to the third groove, the second protrusion is connected with the first protrusion, and the pressure release component is arranged on the second protrusion; wherein the first groove section penetrates a groove side surface of the third groove along the first direction.

In the above technical scheme, the wall still is provided with the third recess towards one side of insulating part, and the wall portion deviates from one side of insulating part and corresponds the position of third recess and be formed with the second arch, through set up pressure release part on the second arch, and set up the first slot section of second recess to the structure of running through the groove side of third recess along first direction for the first slot section of second recess can communicate with the third recess, in so that the thermal runaway gas in the second recess gets into the third recess in the back release through the pressure release part that sets up on the second arch, be favorable to further promoting the inside exhaust smoothness of battery monomer.

In some embodiments, the insulating member is provided with fourth grooves on both sides of the wall portion in the thickness direction, the fourth grooves provided on both sides of the insulating member in the thickness direction of the wall portion are arranged in the first direction and are communicated with each other between the adjacent fourth grooves, and the first groove is communicated with the adjacent fourth grooves; the fourth groove is arranged on one side of the insulating piece facing the wall part and is a first groove, the first groove is arranged on at least one side of the first groove in the first direction, the second groove sections are arranged in one-to-one correspondence with the first grooves on the same side of the first groove in the first direction along the thickness direction of the wall part, and at least part of projection of the second groove sections is positioned in the corresponding first grooves.

In the above-mentioned technical scheme, through all setting up the fourth recess in the insulator along the both sides of wall on the thickness direction, and set up in the insulator between two adjacent fourth recesses in the fourth recess of wall on the thickness direction both sides, through set up the first recess into the structure of mutual intercommunication with adjacent fourth recess, make the inside thermal runaway gas of battery can get into fourth recess and first recess back in proper order and release through the pressure release part, thereby can increase the inside exhaust route of battery, be favorable to promoting the inside exhaust smoothness of battery, wherein, set up in the fourth recess of insulator in the thickness direction of wall towards one side of wall for first groove, through the first groove correspondence setting of second groove section and the same one side that is located first groove in first direction, and the second groove section is located corresponding first groove in the projection on the thickness direction of wall, so that the inside thermal runaway gas of realization entering to first groove can also get into the inside of first groove through the second groove section and first groove section back entering to the inside through the inside of first recess in proper order, the inside thermal runaway gas of this kind of battery can be carried out through the inside the first groove of this kind of thermal runaway section and the inside thermal runaway section that can be realized to the inside the first groove of carrying out in proper order through the thermal runaway section of this kind of the first groove of the thermal runaway section is reached.

In some embodiments, a through hole is formed on at least one side of the insulating member along the second direction, at least one fourth groove is correspondingly provided with the through hole communicated with the through hole, and the first direction, the second direction and the thickness direction of the wall part are perpendicular to each other.

In the above technical scheme, at least one side of the fourth groove in the second direction is correspondingly provided with the through hole, so that the thermal runaway gas in the gap between the electrode assembly and the shell in the second direction can more smoothly enter the fourth groove through the through hole, then enter the first groove and then be discharged through the pressure release component, so that the thermal runaway gas in the gap between the electrode assembly and the shell in the second direction can be more easily discharged and flows, and the exhaust smoothness of the interior of the battery cell can be effectively improved when the battery cell is in thermal runaway, so that the pressure release rate of the battery cell is improved.

In some embodiments, at least one of the fourth grooves extends through a surface of at least one side of the insulator in the second direction to form the through opening in the insulator.

In the above technical scheme, through setting the fourth recess to the structure of running through at least one side of insulating part along the second direction to form the through-hole on the insulating part, the battery monomer of adopting this kind of structure can promote the smoothness that the thermal runaway gas in the clearance between electrode assembly and shell in the second direction gets into in the fourth recess through the through-hole, thereby can promote the inside exhaust smoothness of battery monomer when thermal runaway, be favorable to promoting the pressure release rate of battery monomer.

In some embodiments, a first through hole is provided on a groove sidewall of at least one side of at least one of the fourth grooves along the second direction, and the first through hole is the through hole.

In the above technical scheme, through set up first through-hole on the groove lateral wall of at least one side along the second direction at the fourth recess, first through-hole runs through the groove lateral wall of fourth recess to form the through-hole on one side of insulating part, the battery monomer of adopting this kind of structure can also satisfy the demand of the structural strength of insulating part when realizing that the thermal runaway gas in the clearance between electrode assembly and the shell can get into in the fourth recess through the through-hole, is favorable to reducing the risk such as fracture or deformation appear in the use of insulating part.

In some embodiments, in a plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the insulating member is rectangular, and the length direction of the orthographic projection of the insulating member is the first direction, and the width direction of the orthographic projection of the insulating member is the second direction.

In the above technical scheme, the projection of insulating part on the thickness direction of wall portion is rectangle, and the length direction and the width direction of the projection of insulating part are first direction and second direction respectively, on the one hand make the fourth recess that sets up in insulating part on the thickness direction both sides of wall portion be the structure of arranging along the length direction of insulating part, be favorable to reducing the degree of difficulty that processing set up fourth recess on the insulating part, on the other hand make the through-hole be located insulating part in its width direction's at least one side, so that processing formation through-hole on the insulating part, and be convenient for all correspond to setting up the through-hole to one or more fourth recesses, be favorable to reducing the manufacturing degree of difficulty of insulating part.

In some embodiments, the fourth groove provided on a side of the insulating member facing away from the wall portion in a thickness direction of the wall portion is a second groove; wherein at least one first groove is correspondingly provided with the through hole communicated with the first groove; and/or at least one second groove is correspondingly provided with the through hole communicated with the second groove.

In the technical scheme, through correspondingly arranging the through holes on at least one first groove, the thermal runaway gas in the gap between the electrode assembly and the shell in the second direction directly enters the first groove and then enters the first groove through the second groove, and the exhaust smoothness of the inside of the battery cell is improved. Through correspond the at least one second groove and set up the through-hole for the second groove can enough collect the thermal runaway gas of insulating part towards one side of electrode assembly, can also collect the thermal runaway gas in the clearance between electrode assembly and the shell in the second direction, in order to optimize the inside thermal runaway gas flow's of battery monomer route, in order to promote the free pressure release rate of battery.

In some embodiments, at least one side of the first groove is provided with the first groove and the second groove along the first direction.

In the above technical scheme, through set up first groove and second groove along first direction's at least one side at first recess, on the one hand make first recess and fourth recess be the structure of arranging along first direction, and first recess is provided with the fourth recess in first direction's at least one side, so that the direction of arranging of a plurality of fourth recesses is the same with first recess and fourth recess's direction of arranging, be favorable to reducing the degree of difficulty that sets up first recess and fourth recess on the insulating part, on the other hand can realize that first recess's same side in first direction both is provided with the first groove towards wall portion, still be provided with the second groove that deviates from wall portion, in order to be located first groove and second groove mutually supporting the inside thermal runaway gas of guide shell of same one side of first recess in first direction get into first recess, be favorable to promoting the free inside exhaust smoothness of battery.

In some embodiments, the first grooves and the second grooves located on the same side of the first groove are alternately arranged along the first direction.

In the technical scheme, the first grooves and the second grooves on the same side of the first groove in the first direction are arranged in an alternating arrangement, so that the fourth grooves arranged towards the wall part and the fourth grooves arranged away from the wall part in the fourth grooves on the same side of the first groove in the first direction are alternately arranged.

In some embodiments, the fourth groove adjacent to the first groove is the second groove in the first direction.

In the above technical scheme, through setting the fourth recess adjacent to the first recess as the second groove in first direction for first recess and the structure of the both sides in the thickness direction of wall portion of insulating part for setting up respectively in the insulating part with its adjacent fourth recess, the insulating part that adopts this kind of structure can promote the structural strength of insulating part, is favorable to reducing the insulating part and appears fracture or deformation's phenomenon in the use, in order to promote the life of insulating part.

In some embodiments, the second slot has a slot width in the first direction that is greater than a slot width of the first slot.

In the above technical scheme, the groove width of the second groove in the first direction is set to be larger than the groove width of the first groove in the first direction, so that the fourth grooves arranged for facing the electrode assembly in the fourth grooves are larger than the fourth grooves arranged for facing the wall part in the first direction, and the smoothness of the insulating part for entering the second groove from the thermal runaway gas on one side of the insulating part facing the electrode assembly can be improved under the condition of meeting the structural strength requirement of the insulating part, so that the discharge rate of the thermal runaway gas inside the battery cell entering the second groove and then being discharged through the first groove is improved.

In some embodiments, the first groove is located on the same side of the first groove in the first direction; and/or, along the first direction, the second grooves are positioned on the same side of the first groove.

In the above technical scheme, through setting up the first groove that is located the same side of first recess in first direction to a plurality of to make the inside thermal runaway gas of battery monomer gather to the first recess in through a plurality of first grooves, release through the pressure release part again, be favorable to further promoting the inside exhaust route of battery monomer, in order to promote the free pressure release rate of battery. Likewise, through setting up the second groove that is located the same side of first recess in first direction to a plurality of to make the inside thermal runaway gas of battery monomer can gather to the first recess in through a plurality of second grooves, release through the pressure release part again, be favorable to further promoting the inside exhaust route of battery monomer, in order to promote the free pressure release rate of battery.

In some embodiments, the insulating member has a first partition wall, and in the first direction, the first partition wall partitions two adjacent fourth grooves, and a second through hole is provided on the first partition wall, and the second through hole communicates two adjacent fourth grooves.

In the above technical solution, the insulating member has the first partition wall that separates two adjacent fourth grooves in the first direction, that is, the first partition wall is one wall that is formed and shared between two adjacent fourth grooves in the first direction, so that two adjacent fourth grooves can be mutually communicated by providing the second through hole penetrating the first partition wall on the first partition wall, and the insulating member has a simple structure and is convenient to manufacture and process.

In some embodiments, a bottom wall of the first groove is provided with a third through hole extending in a thickness direction of the wall portion, the third through hole penetrating a bottom wall of the first groove.

In the above technical scheme, through set up the third through-hole that runs through the diapire of the groove diapire of first groove along the thickness direction of wall portion on the diapire of first groove for the insulating part is towards the thermal runaway gas of one side of electrode assembly still can get into in the first groove through the third through-hole again through second recess, first recess and pressure release part discharge in proper order, thereby can further increase the inside exhaust route of battery monomer, be favorable to promoting the free decompression speed of battery, in order to promote the free reliability of use of battery.

In some embodiments, the insulator has a second partition wall that separates the first groove and the fourth groove, the second partition wall being provided with a fourth through hole that communicates the first groove and the fourth groove.

In the above technical solution, the insulating member has a second partition wall for separating the adjacent first groove and fourth groove, that is, the second partition wall is a wall formed and shared between the adjacent first groove and fourth groove, so that the adjacent first groove and fourth groove can be mutually communicated by providing a fourth through hole penetrating the second partition wall on the second partition wall, and the insulating member has a simple structure and is convenient to manufacture and process.

In some embodiments, the first groove and the fourth groove are arranged along the first direction, the second partition wall includes a first wall, a second wall, and a third wall, the first wall and the third wall are arranged at intervals along the first direction, and the second wall connects the first wall and the third wall; wherein at least one of the first wall, the second wall, and the third wall is provided with the fourth through hole.

In the above technical solution, the first groove and the fourth groove are arranged along the first direction, so that the second partition wall is located between the adjacent first groove and fourth groove along the first direction, the difficulty of arranging the fourth through hole on the second partition wall can be reduced, the area of arranging the fourth through hole can be increased by adopting the second partition wall with the structure that the first wall and the third wall are arranged along the first direction at intervals, the cross section of the second partition wall is similar to the structure of a Z shape, correspondingly, the first groove is of a stepped groove structure, and the adjacent first groove and the fourth groove can be mutually communicated by arranging the fourth through hole on at least one of the first wall, the second wall and the third wall.

In some embodiments, a bottom wall of the first groove is provided with a fifth through hole extending in a thickness direction of the wall portion, the fifth through hole penetrating a bottom wall of the first groove.

In the above technical scheme, through set up the fifth through-hole that runs through the tank bottom wall of first recess along the thickness direction of wall portion on the tank diapire of first recess for the inside thermal runaway gas of battery monomer can also directly get into in the first recess through the fifth through-hole again through the pressure release part and release, be favorable to reducing the insulating part and blockking the pressure release part, in order to promote the free pressure release rate of battery.

In some embodiments, the housing is rectangular, and the largest dimension of the housing is L, satisfying 310 mm.ltoreq.L.ltoreq.600 mm, and the electrode assembly is a laminated structure.

In the above technical scheme, through setting the length of the outer shell of the battery monomer to between 310mm and 600mm to promote the holistic size of the battery monomer, thereby can promote the free electric capacity of the battery, in order to realize the free battery of large capacity, because the free battery of large capacity produces more thermal runaway gas when taking place thermal runaway, and then the free battery of adopting this kind of structure can be convenient for the free battery of large capacity in the free battery of thermal runaway gas flow and discharge, in order to promote the free pressure release rate of the free battery of large capacity, be favorable to reducing the free battery of large capacity because of the untimely scheduling risk of pressure release. In addition, through setting up the electrode assembly into lamination formula structure to be convenient for process according to actual demand and form the single battery of large capacity, be favorable to reducing the single manufacturing degree of difficulty of battery.

In some embodiments, the housing comprises a shell and an end cap; the inside of the case is formed with a receiving chamber having an opening, in which the electrode assembly is received; the end cap closes the opening; wherein the end cap is the wall portion; or, one wall of the housing is the wall portion.

In the above technical scheme, through setting up the wall portion of shell into the open-ended end cover that the shell is used for closed casing, the battery monomer of adopting this kind of structure is convenient for set up the insulating part between wall portion and electrode assembly, and can reduce the degree of difficulty that sets up pressure release part and second recess on the wall portion to be favorable to reducing the manufacturing degree of difficulty at the battery monomer, in order to promote the free production efficiency of battery. Likewise, through setting the wall portion of shell to a wall of casing, the battery monomer that adopts this kind of structure can realize that the shell is provided with the wall portion of pressure release part and keeps away from the end cover to can effectively alleviate the phenomenon that the stress that end cover and casing interconnect produced directly acts on pressure release part, in order to reduce the influence that causes pressure release part, and then be favorable to reducing pressure release part and appear fracture or structural strength decline's risk under the effect of pulling of stress, in order to promote battery monomer's life and reliability in use.

In a second aspect, an embodiment of the present application further provides a battery device, including the above battery cell.

In a third aspect, an embodiment of the present application further provides an electrical device, including the above battery cell or the above battery device.

In a fourth aspect, an embodiment of the present application further provides an energy storage device, including the above battery cell or the above battery device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

Fig. 2 is an exploded view of a battery device according to some embodiments of the present application;

fig. 3 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

fig. 4 is a structural exploded view of a battery cell according to some embodiments of the present application;

FIG. 5 is a schematic view of a wall portion of a housing according to some embodiments of the present application;

Fig. 6 is a cross-sectional view of a battery cell provided in some embodiments of the application;

FIG. 7 is a schematic view of an insulator according to some embodiments of the present application;

FIG. 8 is a partial cross-sectional view of an insulator provided in accordance with some embodiments of the present application;

Fig. 9 is an isometric view of a side of an insulator facing an electrode assembly provided in some embodiments of the application;

FIG. 10 is a schematic view of an insulator according to still other embodiments of the present application;

FIG. 11 is a schematic view of an insulator according to still other embodiments of the present application;

FIG. 12 is a schematic view of an insulator according to further embodiments of the present application;

fig. 13 is a cross-sectional view of an energy storage device according to some embodiments of the present application.

Icon: 1000-vehicle; a 100-cell device; 10-a box body; 11-a first tank body; 12-a second tank body; 20-battery cells; 21-a housing; 211-wall portion; 2111-pressure relief means; 2112-a second groove; 2112 a-a first groove section; 2112 b-a second groove section; 2113-first protrusions; 2114-third groove; 2115-second protrusions; 212-a housing; 2121-opening; 213-end caps; 214-a first plate; 22-electrode assembly; 221-tab; 23-insulating member; 231-a first groove; 2311-a first groove part; 2312-a second slot portion; 232-fourth groove; 2321-a first slot; 2322-a second slot; 233-through opening; 234-a first via; 235-a first partition wall; 2351-second through holes; 236-a third via; 237-a second partition wall; 2371-fourth through holes; 2372-a first wall; 2373-a second wall; 2374-a third wall; 238-fifth through hole; 24-electrode terminals; 25-a current collecting member; 26-exhaust gap; 200-a controller; 300-motor; 2000-energy storage device; 2001-energy storage box; x-thickness direction of wall; y-a first direction; z-second direction.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

In the embodiment of the application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cell may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited by the embodiment of the application.

The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.

As an example, the positive electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, surface-silver-treated aluminum, surface-silver-treated stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material may be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of the lithium-containing phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO ₄ (which may also be referred to simply as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO ₄), a composite of lithium manganese phosphate and carbon, lithium manganese phosphate, and a composite of lithium manganese phosphate and carbon.

In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.

As an example, the negative electrode current collector may employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, or the like can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy and the like. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

As an example, the anode current collector has two surfaces opposing in its own thickness direction, and the anode active material is provided on either or both of the two surfaces opposing the anode current collector.

As an example, a negative active material for a battery cell, which is well known in the art, may be used. As an example, the anode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, and the like. The silicon-based material may be at least one selected from elemental silicon, silicon oxygen compounds, silicon carbon composites, silicon nitrogen composites, and silicon alloys. The tin-based material may be at least one selected from elemental tin, tin oxide, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery anode active material may be used. These negative electrode active materials may be used alone or in combination of two or more.

In some embodiments, the material of the positive electrode current collector may be aluminum and the material of the negative electrode current collector may be copper.

In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

In some embodiments, the separator is a separator film. The type of the separator may be various, and any known porous separator having good chemical stability and mechanical stability may be selected.

As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multilayer composite film. When the separator is a multilayer composite film, the materials of the respective layers may be the same or different. The separator may be a single member located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes.

In some embodiments, the separator is a solid state electrolyte. The solid electrolyte is arranged between the anode and the cathode and plays roles in transmitting ions and isolating the anode and the cathode.

In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive and negative electrodes. The electrolyte may be liquid, gel or solid. Wherein the liquid electrolyte comprises an electrolyte salt and a solvent.

In some embodiments, the electrode assembly is a rolled-up structure. The positive plate and the negative plate are wound into a winding structure.

In some embodiments, the electrode assembly is a laminated structure.

As an example, a plurality of positive electrode sheets and negative electrode sheets may be provided, respectively, and a plurality of positive electrode sheets and a plurality of negative electrode sheets may be alternately stacked.

As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheets are folded to form a plurality of folded sections arranged in a stacked manner, with one positive electrode sheet sandwiched between adjacent folded sections.

As an example, the positive and negative electrode sheets are each folded to form a plurality of folded sections in a stacked arrangement.

As an example, the separator may be provided in plurality, respectively between any adjacent positive electrode sheet or negative electrode sheet.

As an example, the separator may be continuously provided, being disposed between any adjacent positive or negative electrode sheets by folding or winding.

In some embodiments, the electrode assembly may have a cylindrical shape, a flat shape, a polygonal column shape, or the like.

In some embodiments, the electrode assembly is provided with tabs that can conduct current away from the electrode assembly. The tab includes a positive tab and a negative tab.

In some embodiments, the battery cell may include a housing. The case is used to encapsulate the electrode assembly, the electrolyte, and the like. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), an aluminum-plastic film or the like.

As examples, the battery cells may be cylindrical battery cells, prismatic battery cells, pouch battery cells, or other shaped battery cells, including but not limited to square-case battery cells, blade-shaped battery cells, polygonal prismatic batteries, such as hexagonal-prismatic batteries, and the like.

The battery device (Battery Apparatus) as referred to in embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells connected in series, parallel, or series-parallel by a bus bar.

In some embodiments, the battery cell assembly (Battery Cell Assembly) is generally formed from an arrangement of a plurality of battery cells; as an example, the Battery cell assembly may be a Battery Module (Battery Module) formed by arranging and fixing a plurality of Battery cells to form an independent Module. As an example, the battery module may be formed by binding a plurality of battery cells by a tie.

In some embodiments, the battery device may be a battery Pack (battery Pack) that includes a case and one or more battery cell assemblies housed in the case.

As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the case in such a manner that the battery module is fixed in the case.

As an example, the battery cell assembly may be accommodated in the case by directly fixing a plurality of battery cells to the case.

As an example, the case may include a first case body and a second case body. The first box body and the second box body are buckled, so that a closed space is formed inside the box body to accommodate the battery cell assembly. The closing means covering or closing, and can be sealing or unsealing. The first tank body may be a top cover or a bottom plate.

As an example, the case may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

As an example, the tank may be part of the chassis structure of the vehicle. For example, the roof of the tank may become at least part of the floor of the vehicle, or the frame of the tank may become at least part of the cross and longitudinal beams of the vehicle.

In some embodiments, the battery device refers to an energy storage device that includes a housing with a door on at least one side of the housing. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

The battery device has the outstanding advantages of high energy density, small environmental pollution, high power density, long service life, wide application range, small self-discharge coefficient and the like, and is an important component of the development of new energy sources at present. The development of battery technology is taking into consideration various design factors such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters, and the safety of battery devices.

For a general battery cell, the battery cell comprises a shell and an electrode assembly accommodated in the shell, and a pressure release part is generally arranged on the wall part of the shell, so that the pressure release part can be cracked when the battery cell is in thermal runaway so as to release the internal pressure of the battery cell, thereby being beneficial to ensuring the use safety of the battery cell. In the related art, in order to reduce the single short circuit risk of battery, can set up the insulating part usually between electrode assembly and shell wall for the insulating part can insulate and keep apart electrode assembly and wall, with the short circuit risk between electrode assembly and the wall reduced, but in the single battery of this kind of structure, the insulating part can cause certain blocking to the gas exhaust path of the inside thermal runaway gas of single battery when thermal runaway takes place for single battery, and the thermal runaway gas between insulating part and the wall can't pass through the outside of pressure release part discharge shell comparatively smoothly, thereby lead to single battery's inside exhaust smoothness degree when thermal runaway is relatively poor, with lead to the fact single battery's decompression rate lower, and then make single battery extremely easy because of the untimely risk such as ignition explosion that causes of decompression, be unfavorable for promoting single battery's reliability in use.

Based on the above considerations, in order to solve the problem of low use reliability of the battery cell, the embodiment of the application provides a battery cell, which includes a housing, an electrode assembly, and an insulating member. The housing has a wall portion provided with a pressure relief member configured to relieve an internal pressure of the battery cell. The electrode assembly is disposed within the housing. The insulating part is arranged between the wall part and the electrode assembly, and a first groove is arranged at the position, facing one side of the wall part, of the insulating part and corresponding to the pressure release part. Along the thickness direction of wall portion, the wall sets up the second recess towards one side of electrode assembly, the second recess includes first slot segment and a plurality of second slot segment, first slot segment extends along first direction, the part of the projection of first slot segment on the insulating part along the thickness direction of wall portion is located first recess, a plurality of second slot segments are arranged along first direction interval, a plurality of second slot segments all communicate with first slot segment, and the extending direction of second slot segment intersects with the extending direction of first slot segment, the extending direction of first direction and second slot segment all is perpendicular to the thickness direction of wall portion.

In the battery monomer of this kind of structure, the inside of shell is provided with the insulating part, and the insulating part is located between wall and the electrode assembly, make the insulating part can play the effect of insulating division wall and electrode assembly, with the short circuit risk between reduction electrode assembly and the wall, wherein, one side of insulating part towards wall is provided with the first recess that corresponds with the pressure release part, through set up the second recess on the surface of one side at wall face insulating part, the second recess is provided with first slot section and a plurality of second slot section, and a plurality of second slot section is for arranging along the extending direction interval of first slot section and with the structure of first slot section intercommunication each other, and make the second recess form a plurality of slot sections that have vertically and horizontally staggered, and the first slot section sets up to be located first recess in the projection on the thickness direction of wall, make when the battery monomer takes place thermal runaway, can be through the second slot section under the prerequisite of the thermal runaway gas demand between guide insulating part and the wall to the first slot section reentry recess in the surface, and can carry out the thermal runaway gas through the second slot section again after entering the first recess, thereby the thermal runaway gas can the thermal runaway section carries out the thermal runaway rate through the second slot section and the thermal runaway section can the thermal runaway section, the thermal runaway can be carried out the thermal runaway section can the thermal runaway section through the second through the first slot section and the second slot section, the thermal runaway section can be more than the battery can the thermal runaway section, the battery can be carried out the thermal runaway section and the battery can be carried out the single through the battery can the battery has the thermal runaway section and the thermal runaway section to the battery section has the thermal runaway section to the thermal runaway section to the battery section has the thermal runaway section and the battery section has the thermal runthis section to the thermal section and the battery section has the thermal device.

The battery cell disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the electric devices. The power supply system with the battery cell, the battery device and the like which are disclosed by the application can be used for forming the power supply device, so that the problem that the battery cell is easy to cause fire explosion due to untimely pressure release is solved, and the use reliability of the battery cell is improved.

The embodiment of the application provides an electric device using a battery monomer or a battery device as a power supply, wherein the electric device can be, but is not limited to, a mobile phone, a flat plate, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments will take an electric device according to an embodiment of the present application as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery device 100 is provided in the vehicle 1000, and the battery device 100 may be provided at the bottom of the vehicle 1000, at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery device 100 may be used for power supply of the vehicle 1000, for example, the battery device 100 may be used as an operation power source or a use power source of the vehicle 1000, or the like. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery device 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, the battery device 100 may not only be used as an operating power source or a utility power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2 and 3, fig. 2 is an exploded view of a battery device 100 according to some embodiments of the present application, and fig. 3 is a schematic view of a battery cell 20 according to some embodiments of the present application. The battery device 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10.

The case 10 is used to provide an assembly space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first case body 11 and a second case body 12, the first case body 11 and the second case body 12 being covered with each other, the first case body 11 and the second case body 12 together defining an assembly space for accommodating the battery cell 20. The second box body 12 may have a hollow structure with one end opened, the first box body 11 may have a plate-shaped structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 define an assembly space together; the first tank body 11 and the second tank body 12 may each have a hollow structure with one side opened, and the open side of the first tank body 11 may be closed to the open side of the second tank body 12.

Of course, the case 10 formed by the first case body 11 and the second case body 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or a square, etc. Illustratively, in fig. 2, the case 10 is rectangular in shape.

In the battery device 100, the number of battery cells 20 provided in the case 10 may be one or more. When the number of the battery cells 20 disposed in the case 10 is plural, the plurality of battery cells 20 may be connected in series or parallel or a series-parallel connection, and the series-parallel connection means that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery device 100 may also be a battery module form formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole, and integrally accommodated in the case 10.

In some embodiments, the battery device 100 may further include other structures, for example, the battery device 100 may further include a bus member for connecting the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may have a rectangular parallelepiped, cylindrical, prismatic, or other shape. Illustratively, in fig. 3, the battery cell 20 is of a rectangular parallelepiped structure.

Referring to fig. 3, and further referring to fig. 4, 5, 6 and 7, fig. 4 is a structural exploded view of a battery cell 20 according to some embodiments of the present application, fig. 5 is a structural schematic view of a wall portion 211 of a housing 21 according to some embodiments of the present application, fig. 6 is a cross-sectional view of the battery cell 20 according to some embodiments of the present application, and fig. 7 is a structural schematic view of an insulating member 23 according to some embodiments of the present application. The present application provides a battery cell 20, and the battery cell 20 includes a case 21, an electrode assembly 22, and an insulating member 23. The housing 21 has a wall portion 211, the wall portion 211 being provided with a pressure release member 2111, the pressure release member 2111 being configured to release the internal pressure of the battery cell 20. The electrode assembly 22 is disposed within the case 21. The insulator 23 is disposed between the wall portion 211 and the electrode assembly 22, and a first groove 231 is provided at a position of the insulator 23 facing the wall portion 211 and corresponding to the pressure release member 2111. Along the thickness direction X of the wall portion, a second groove 2112 is provided in a side of the wall portion 211 facing the electrode assembly 22, the second groove 2112 includes a first groove section 2112a and a plurality of second groove sections 2112b, the first groove section 2112a extends in a first direction Y, a portion of the projection of the first groove section 2112a onto the insulator 23 along the thickness direction X of the wall portion is located in the first groove 231, the plurality of second groove sections 2112b are arranged at intervals along the first direction Y, the plurality of second groove sections 2112b are all communicated with the first groove section 2112a, and the extending direction of the second groove section 2112b intersects with the extending direction of the first groove section 2112a, and the extending directions of the first direction Y and the second groove section 2112b are all perpendicular to the thickness direction X of the wall portion.

Wherein the housing 21 may also be used to house an electrolyte, such as an electrolyte solution or the like. The material of the housing 21 may be various, such as copper, iron, aluminum, steel, or aluminum alloy.

In some embodiments, the case 21 may include a case 212 and an end cap 213, the case 212 having a receiving cavity formed therein for receiving the electrode assembly 22, and the receiving cavity having an opening 2121, that is, the case 212 has a hollow structure having one end opened 2121, and the end cap 213 is covered at the opening 2121 of the case 212 and forms a sealing connection to form a sealed space for receiving the electrode assembly 22 and electrolyte.

In assembling the battery cell 20, the electrode assembly 22 may be placed in the case 212, and the case 212 may be filled with the electrolyte, and then the end cap 213 may be covered on the opening 2121 of the case 212 to complete the assembly of the battery cell 20.

The housing 212 may be of various shapes, such as a cylinder or prismatic structure, etc. The shape of the case 212 may be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, a cylindrical structure of the case 212 may be selected. Of course, the structure of the end cap 213 may be various, for example, the end cap 213 may be a plate structure or a hollow structure with one end opened. Illustratively, in fig. 3 and 4, the housing 212 is a rectangular parallelepiped structure and the end cap 213 is a rectangular plate-like structure.

The wall portion 211 is provided with a pressure release member 2111, and the pressure release member 2111 is configured to release the pressure of the battery cell 20, i.e., the pressure release member 2111 is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

Alternatively, the pressure release member 2111 and the wall portion 211 may be integrally formed, or may be separately formed. Illustratively, in fig. 3 and 4, the pressure release member 2111 and the wall portion 211 are configured as separate bodies, that is, the pressure release member 2111 and the wall portion 211 are configured as separate bodies, the pressure release member 2111 may be connected to the wall portion 211 by welding or the like, and correspondingly, the pressure release member 2111 may be a member such as an explosion-proof valve, an explosion-proof sheet, an air valve, a pressure release valve, or a safety valve. Of course, in other embodiments, the pressure release member 2111 and the wall portion 211 may be integrally formed, that is, the pressure release member 2111 and the wall portion 211 are integrally formed, and the pressure release member 2111 is a region of the wall portion 211 formed with a weak structure, for example, the pressure release member 2111 is a region of the wall portion 211 provided with a pressure release groove.

The wall 211 provided with the pressure release member 2111 may be the end cap 213 of the housing 21 or may be one wall of the case 212. Illustratively, in fig. 3 and 4, the wall 211 is an end cap 213 of the housing 21. Of course, the structure of the battery cell 20 is not limited to this, in other embodiments, the housing 212 may include a side wall and a bottom wall, the side wall is disposed around the bottom wall, the bottom wall is disposed opposite to the end cap 213 along the thickness direction X of the wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall is enclosed to form the opening 2121, and correspondingly, the wall 211 may be a bottom wall or a side wall of the housing 212.

In the embodiment of the present application, the electrode assembly 22 is a component in which electrochemical reaction occurs in the battery cell 20, and the structure of the electrode assembly 22 may be various, and the electrode assembly 22 may be a wound structure formed by winding a positive electrode sheet, a separator and a negative electrode sheet, or a laminated structure formed by laminating a positive electrode sheet, a separator and a negative electrode sheet.

Illustratively, in fig. 3 and 4, the case 21 has a rectangular parallelepiped shape, the height direction of the case 21 is the thickness direction X of the wall portion, the length direction of the case 21 is the first direction Y, the thickness direction of the case 21 is the second direction Z, correspondingly, the electrode assembly 22 is a laminated structure formed by laminating a positive electrode sheet, a separator and a negative electrode sheet, and the lamination direction of the positive electrode sheet, the separator and the negative electrode sheet is the second direction Z, and the first direction Y, the second direction Z and the thickness direction X of the wall portion are perpendicular to each other.

The separator is exemplified by a separator, and the separator may be made of at least one material selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

Alternatively, the electrode assembly 22 accommodated in the case 21 may be one or more. Illustratively, in fig. 4, two electrode assemblies 22 are disposed within the case 21 of the battery cell 20, and the two electrode assemblies 22 are stacked in the thickness direction thereof, that is, the two electrode assemblies 22 are stacked in the second direction Z. Of course, in other embodiments, the electrode assembly 22 accommodated in the case 21 may be one, three, four, five, six, seven, eight, or the like.

In some embodiments, referring to fig. 4, the battery cell 20 may further include an electrode terminal 24, the electrode terminal 24 being insulatively mounted on the case 21, and the electrode terminal 24 being electrically connected with the electrode assembly 22 to output or input electric power of the battery cell 20.

The electrode terminal 24 is mounted on the case 21 in an insulating manner, that is, no electrical connection is formed between the electrode terminal 24 and the case 21.

In fig. 3 and 4, the battery cell 20 includes two electrode terminals 24, and the two electrode terminals 24 are mounted on the housing 21 in an insulating manner, and correspondingly, each electrode assembly 22 has two tabs 221, and the polarities of the two tabs 221 are opposite, and the two electrode terminals 24 are electrically connected to the two tabs 221 of the electrode assembly 22, respectively, so as to implement input or output of the positive electrode and the negative electrode of the battery cell 20. The tab 221 of the electrode assembly 22 is a member formed by stacking and connecting regions of the positive electrode sheet where the positive electrode active material layer is not coated, or a member formed by stacking and connecting regions of the negative electrode sheet where the negative electrode active material layer is not coated. If the tab 221 is used for the positive electrode of the output electrode assembly 22, the tab 221 is a member formed by laminating and connecting regions of the positive electrode sheet, which are not coated with the positive electrode active material layer, to each other; if the tab 221 is used for the negative electrode of the output electrode assembly 22, the tab 221 is a member formed by laminating and connecting regions of the negative electrode sheet where the negative electrode active material layer is not coated.

Alternatively, the structure in which the tabs 221 are disposed on the electrode assembly 22 may be various, for example, two tabs 221 of the electrode assembly 22 may be disposed at both ends of the electrode assembly 22 in the first direction Y, respectively, and correspondingly, two electrode terminals 24 of the battery cell 20 may be disposed at both ends of the case 21 in the first direction Y, may be disposed at the same end of the case 21 in the thickness direction X of the wall portion, or may be disposed at both ends of the case 21 in the thickness direction X of the wall portion, respectively. Of course, in other embodiments, the two tabs 221 may be disposed at the same end of the electrode assembly 22 facing the wall portion 211 in the thickness direction X of the wall portion, and correspondingly, the two electrode terminals 24 may be disposed on the wall portion 211.

Illustratively, in fig. 3 and 4, two tabs 221 of the electrode assembly 22 are disposed at both ends of the electrode assembly 22 in the first direction Y, respectively, and two electrode terminals 24 are disposed on the wall portion 211.

For example, the electrode terminal 24 may be made of various materials, for example, the electrode terminal 24 may be made of copper, iron, aluminum, steel, aluminum alloy, or the like.

In some embodiments, referring to fig. 4, the battery cell 20 may further include two current collecting members 25, where the two current collecting members 25 are disposed in the housing 21, and each current collecting member 25 is used to connect one electrode terminal 24 and the tab 221 with the same polarity in the plurality of electrode assemblies 22, so as to achieve the electrical connection between the electrode terminal 24 and the electrode assemblies 22, which is beneficial to reducing the assembly difficulty between the tab 221 and the electrode terminal 24.

Illustratively, the material of the current collecting member 25 may be various, for example, the material of the current collecting member 25 may be copper, iron, aluminum, steel or aluminum alloy.

Alternatively, the connection structure between the current collecting member 25 and the tab 221 and between the current collecting member 25 and the electrode terminal 24 may be various, such as welding connection or abutment.

In the embodiment of the present application, the insulator 23 is disposed within the case 21 and between the wall portion 211 and the electrode assembly 22 such that the insulator 23 is configured to insulate the wall portion 211 from the electrode assembly 22 to reduce the risk of shorting between the electrode assembly 22 and the wall portion 211, and likewise, in the embodiment in which the battery cell 20 further includes the current collecting member 25, the current collecting member 25 is located on the side of the insulator 23 facing away from the wall portion 211 in the thickness direction X of the wall portion such that the insulator 23 is further configured to insulate the wall portion 211 and the current collecting member 25.

Illustratively, the material of the insulating member 23 may be various, for example, the material of the insulating member 23 may be polypropylene, polyethylene terephthalate, or the like.

In fig. 3 and 4, the housing 21 of the battery cell 20 is formed as a rectangular parallelepiped, and the insulating member 23 is formed as a rectangular plate-like structure, so that the orthographic projection of the insulating member 23 in a plane perpendicular to the thickness direction X of the wall portion is formed as a rectangle, and it is noted that the thickness direction X of the wall portion is also formed as the thickness direction of the insulating member 23, the first direction Y is also formed as the length direction of the insulating member 23, and the second direction Z is also formed as the width direction of the insulating member 23.

The insulating member 23 faces one side of the wall portion 211 and is provided with a first groove 231 corresponding to the position of the pressure release member 2111, that is, the insulating member 23 is provided with the first groove 231 on one side facing the wall portion 211 in the thickness direction X of the wall portion, and the first groove 231 is provided opposite to the pressure release member 2111 in the thickness direction X of the wall portion, that is, at least part of the projection of the pressure release member 2111 in the thickness direction X of the wall portion is located in the first groove 231, and illustratively, in the embodiment of the application, the projection of the pressure release member 2111 in the thickness direction X of the wall portion is located entirely in the first groove 231, and the first groove 231 is of a stepped groove structure, that is, the first groove 231 includes a first groove 2311 and a second groove 2312 arranged in the thickness direction X of the wall portion, the first groove 2311 is provided on the surface of the insulating member 23 facing the one side of the wall portion 211, and the second groove 2312 is provided on the groove bottom surface of the first groove 2311.

In the embodiment of the application, the second grooves 2112 are provided along the thickness direction X of the wall portion, on the side of the wall portion 211 facing the electrode assembly 22, that is, the second grooves 2112 are provided on the surface of the wall portion 211 facing the electrode assembly 22 in the thickness direction X of the wall portion.

Alternatively, there may be one or more second grooves 2112 provided on the wall portion 211, and illustratively, in fig. 5, two second grooves 2112 are provided on a side of the wall portion 211 facing the electrode assembly 22, the two second grooves 2112 are respectively provided on both sides of the pressure relief member 2111 in the first direction Y, and correspondingly, each second groove 2112 is provided with a plurality of second groove sections 2112b, and the plurality of second groove sections 2112b are configured to be spaced along the first direction Y.

The second groove 2112 includes a first groove section 2112a and a plurality of second groove sections 2112b, the first groove section 2112a extends along the first direction Y, the plurality of second groove sections 2112b are arranged at intervals along the first direction Y, that is, the second groove 2112 is provided with a plurality of groove sections, which are the first groove section 2112a and the plurality of second groove sections 2112b, respectively, and the plurality of second groove sections 2112b are structures arranged at intervals along the extending direction of the first groove section 2112 a.

Illustratively, in fig. 5, each second groove 2112 includes two second groove segments 2112b, the two second groove segments 2112b being spaced apart along the first direction Y and each communicating with the first groove segment 2112 a. Of course, in other embodiments, the number of second groove segments 2112b of each second groove 2112 may be three, four, five, etc.

The plurality of second groove segments 2112b are each in communication with the first groove segment 2112a, and the extending direction of the second groove segment 2112b intersects with the extending direction of the first groove segment 2112a, that is, the first groove segment 2112a and the second groove segment 2112b are in an intersecting and communicating structure.

Illustratively, in fig. 5, the first groove section 2112a is configured to extend along the first direction Y, and the second groove section 2112b extends along the second direction Z, such that the extending direction of the second groove section 2112b is perpendicular to the extending direction of the first groove section 2112a, however, in other embodiments, the extending direction of the second groove section 2112b and the extending direction of the first groove section 2112a may be disposed at an acute angle. It should be noted that the first groove section 2112a extends along the first direction Y, that is, the dimension of the first groove section 2112a in the first direction Y is larger than the dimension of the first groove section 2112a in the second direction Z, and the second groove section 2112b extends along the second direction Z, that is, the dimension of the second groove section 2112b in the second direction Z is larger than the dimension of the second groove section 2112b in the first direction Y.

The projected portion of the first groove section 2112a on the insulating member 23 in the thickness direction X of the wall portion is located in the first groove 231, that is, the portion of the first groove section 2112a of the second groove 2112 in the thickness direction X of the wall portion is a structure opposite to and facing the first groove 231 on the insulating member 23, so that the second groove 2112 can discharge the thermal runaway gas between the wall portion 211 and the insulating member 23 through the pressure release member 2111 after guiding the thermal runaway gas into the first groove 231 when the thermal runaway of the battery cell 20 occurs.

In the present embodiment, the inside of the case 21 is provided with the insulating member 23 being located between the wall portion 211 and the electrode assembly 22, so that the insulating member 23 can function as insulating the partition wall portion 211 and the electrode assembly 22 to reduce the risk of shorting between the electrode assembly 22 and the wall portion 211, wherein the side of the insulating member 23 facing the wall portion 211 is provided with the first groove 231 corresponding to the pressure release member 2111, the second groove 2112 is provided with the first groove 2112a and the plurality of second groove 2112b by providing the second groove 2112 on the surface of the side of the wall portion 211 facing the insulating member 23, and the plurality of second groove 2112b is a structure arranged at intervals in the extending direction of the first groove 2112a and in communication with the first groove 2112a, so that the second groove 2112 forms a plurality of groove segments with criss-cross, and the projected portion of the first groove 2112a in the thickness direction X of the wall portion is provided to be located within the first groove 231, so when the battery monomer 20 is out of control thermally, under the premise of meeting the structural strength requirement of the wall portion 211, the thermal runaway gas between the insulating piece 23 and the wall portion 211 can be guided by the second groove section 2112b and is collected into the first groove section 2112a and then enters the first groove 231, and then the pressure release part 2111 is used for releasing the thermal runaway gas, so that the exhaust path of the thermal runaway gas inside the battery monomer 20 can be increased, the range of the thermal runaway gas contacted by the second groove 2112 can be increased through the structures of the first groove section 2112a and the second groove section 2112b which are intersected and communicated, so that the thermal runaway gas can enter the first groove 231 through the second groove 2112 and then is released through the pressure release part 2111, the pressure release rate of the battery monomer 20 can be effectively improved, and the use reliability of the battery monomer 20 can be improved.

According to some embodiments of the present application, as shown in fig. 5, the wall portion 211 is provided with two second grooves 2112 on a side facing the electrode assembly 22 in the thickness direction X of the wall portion, and the two second grooves 2112 are located on both sides of the pressure release member 2111 in the first direction Y, respectively.

Wherein two second grooves 2112 are located on both sides of the pressure release member 2111 in the first direction Y, respectively, that is, the pressure release member 2111 is located between the two second grooves 2112 in the first direction Y.

In this embodiment, the wall portion 211 is provided with the second grooves 2112 on both sides of the pressure release member 2111 along the first direction Y, so that the thermal runaway gas located on both sides of the first groove 231 in the first direction Y can be released through the pressure release member 2111 after entering into the first groove 231 through the corresponding second grooves 2112, which is beneficial to further increasing the exhaust path of the thermal runaway gas inside the battery cell 20, so as to further improve the exhaust smoothness inside the battery cell 20 and improve the pressure release rate of the battery cell 20.

In some embodiments, referring to fig. 5, the orthographic projection of the second groove 2112 does not overlap the orthographic projection of the pressure relief feature 2111 in the same plane perpendicular to the thickness direction X of the wall. That is, the projection of the pressure release member 2111 in the thickness direction X of the wall portion does not fall into the second groove 2112.

It should be noted that, in other embodiments, in the same plane perpendicular to the thickness direction X of the wall portion, the front projection of the second groove 2112 and the front projection of the pressure release member 2111 may also be partially overlapped, for example, the pressure release member 2111 and the wall portion 211 are separately disposed, the wall portion 211 is provided with a pressure release hole, the pressure release hole penetrates through two sides of the wall portion 211 along the thickness direction X of the wall portion, the pressure release member 2111 is connected to one side of the wall portion 211 facing away from the electrode assembly 22, the pressure release member 2111 covers and seals the pressure release hole, and a portion of the projection of the pressure release member 2111 in the thickness direction X of the wall portion is located in the pressure release hole, so that the projection of the pressure release member 2111 in the thickness direction X of the wall portion can be partially located in the second groove 2112, so that the front projection of the second groove 2112 and the front projection of the pressure release member 2111 may be partially overlapped in the same plane perpendicular to the thickness direction X of the wall portion.

In the present embodiment, by providing the second groove 2112 and the pressure release member 2111 in a structure in which projections in the thickness direction X of the wall portion do not overlap, interference influence and stress influence between the second groove 2112 and the pressure release member 2111 are reduced, difficulty in providing the second groove 2112 and the pressure release member 2111 on the wall portion 211 is reduced, and a phenomenon in which the pressure release member 2111 is damaged or structural strength is reduced is facilitated.

According to some embodiments of the application, referring to fig. 5, the second groove section 2112b extends along a second direction Z, and the dimension of the second groove section 2112b in the second direction Z is greater than the dimension of the first groove section 2112a in the second direction Z, and the second direction Z is perpendicular to the thickness direction X and the first direction Y of the wall portion.

The second groove segment 2112b has a dimension in the second direction Z that is greater than the dimension of the first groove segment 2112a in the second direction Z, that is, in the second direction Z, the second groove segment 2112b is a structure protruding from at least one side of the first groove segment 2112a, so that the second groove segment 2112b is a structure extending along the second direction Z, and correspondingly, the first groove segment 2112a extends along the first direction Y, that is, the extending direction of the second groove segment 2112b is perpendicular to the extending direction of the first groove segment 2112a, and the second groove segment 2112b protrudes from both sides of the first groove segment 2112a in the second direction Z.

In some embodiments, referring to fig. 5 and 6, the housing 21 has a rectangular parallelepiped shape, and the housing 21 has two first plates 214 opposite to each other in the second direction Z, and the first plates 214 are walls having the largest area among the walls of the housing 21.

The housing 21 has two first plates 214 opposite to each other in the second direction Z, and the first plates 214 are walls with the largest area among the walls of the housing 21, that is, the outer surfaces of the first plates 214 are the largest surface among the plurality of outer surfaces of the housing 21, and correspondingly, the second direction Z is the thickness direction of the battery cell 20. That is, the extending direction of the second groove section 2112b of the second groove 2112 is the thickness direction of the battery cell 20, so that the extending direction of the second groove section 2112b is the same as the arrangement direction of the two first plates 214 of the housing 21.

In this embodiment, by arranging the second groove section 2112b in a structure extending along the second direction Z, the extending direction of the second groove section 2112b is perpendicular to the extending direction of the first groove section 2112a, and the battery cell 20 adopting this structure can improve the regularity of the second groove 2112, which is beneficial to reducing the forming difficulty of the second groove 2112, and on the other hand, the second groove 2112 can guide the thermal runaway gas in the gap between the electrode assembly 22 and the casing 21 in the first direction Y into the first groove 231 through the first groove section 2112a, and can guide the thermal runaway gas in the gap between the electrode assembly 22 and the casing 21 in the second direction Z into the first groove 231 through the second groove section 2112b, so as to effectively improve the exhaust smoothness inside the battery cell 20, so as to improve the pressure release rate of the battery cell 20.

According to some embodiments of the present application, as shown in fig. 4, 5 and 6, a first protrusion 2113 is formed at a position corresponding to the second groove 2112 on a side of the wall portion 211 facing away from the insulating member 23 in the thickness direction X of the wall portion.

Wherein, the first protrusion 2113 is correspondingly formed at the position of the first groove section 2112a and the second groove section 2112b of the wall portion 211 facing away from the insulating member 23 and corresponding to the second groove 2112, so that the shape of the projection of the first protrusion 2113 in the thickness direction X of the wall portion is the same as the shape of the projection of the second groove 2112 in the thickness direction X of the wall portion.

Illustratively, the second grooves 2112 provided on the side of the wall portion 211 facing the electrode assembly 22 are structures formed by a stamping process to form the second grooves 2112 on the side of the wall portion 211 facing the electrode assembly 22 and to form the first protrusions 2113 on the side of the wall portion 211 facing away from the electrode assembly 22 and corresponding to the positions of the second grooves 2112. Of course, the machining manner of the second grooves 2112 provided on the side of the wall portion 211 facing the electrode assembly 22 is not limited thereto, and in other embodiments, the second grooves 2112 provided on the side of the wall portion 211 facing the electrode assembly 22 may be formed by a machining process such as casting or milling.

In the present embodiment, by forming the first protrusion 2113 at the position of the wall portion 211 facing away from the insulating member 23 and corresponding to the second groove 2112, the second groove 2112 provided on the side of the wall portion 211 facing the insulating member 23 is a structure that can be formed by punching, so as to form the second groove 2112 on one side of the wall portion 211, and form the first protrusion 2113 at the position of the other side and corresponding to the second groove 2112, the battery cell 20 adopting this structure can reduce the difficulty of forming the second groove 2112 by processing on the wall portion 211, which is beneficial to improving the production efficiency of the battery cell 20, and can reduce the influence on the structural strength of the wall portion 211, so as to reduce the occurrence of cracking or deformation phenomena of the wall portion 211 during use.

According to some embodiments of the present application, as shown in fig. 4 and 5, a third groove 2114 is provided on a side of the wall portion 211 facing the insulating member 23 in a thickness direction X of the wall portion, and a second protrusion 2115 is formed on a side of the wall portion 211 facing away from the insulating member 23 and corresponding to the third groove 2114, the second protrusion 2115 is connected to the first protrusion 2113, a pressure release member 2111 is provided on the second protrusion 2115, and the first groove section 2112a penetrates a groove side surface of the third groove 2114 in the first direction Y.

In the embodiment in which the wall portion 211 is provided with two second grooves 2112, the third groove 2114 is located between the two second grooves 2112 in the first direction Y, and the first groove sections 2112a of the two second grooves 2112 are each a structure penetrating through the groove side surfaces of the third groove 2114 in the first direction Y, that is, the first groove sections 2112a of the second grooves 2112 located on both sides of the third groove 2114 in the first direction Y are each in communication with the third groove 2114. Correspondingly, the second protrusions 2115 are connected to the first protrusions 2113, i.e. the second protrusions 2115 are connected between two first protrusions 2113 in the first direction Y.

The second groove 2112 and the third groove 2114 are formed by simultaneously punching the wall portion 211 to form the second groove 2112 and the third groove 2114 which are in communication with each other on a side of the wall portion 211 facing the insulating member 23, and to form the first protrusion 2113 and the second protrusion 2115 which are integrally formed on a side of the wall portion 211 facing away from the insulating member 23.

The second protrusion 2115 is provided with a pressure release component 2111, that is, the pressure release component 2111 is provided on the second protrusion 2115, alternatively, the pressure release component 2111 and the second protrusion 2115 may be integrally formed or separately provided. Illustratively, in fig. 3 and 4, the pressure release member 2111 and the second protrusion 2115 are configured as separate bodies, that is, the pressure release member 2111 and the second protrusion 2115 are configured as separate bodies, the pressure release member 2111 may be connected to the second protrusion 2115 by welding or the like, and the second protrusion 2115 is configured to surround the pressure release member 2111, and accordingly, the pressure release member 2111 may be a member such as an explosion-proof valve, an explosion-proof sheet, an air valve, a pressure release valve, or a safety valve. Of course, in other embodiments, the pressure release member 2111 and the second protrusion 2115 may be integrally formed, that is, the pressure release member 2111 and the second protrusion 2115 are integrally formed, and the pressure release member 2111 is a region of the second protrusion 2115 where a weak structure is formed, for example, the pressure release member 2111 is a region of the second protrusion 2115 where a pressure release groove is provided.

In this embodiment, a third groove 2114 is further disposed on a side of the wall portion 211 facing the insulating member 23, and a second protrusion 2115 is formed on a side of the wall portion 211 facing away from the insulating member 23 and corresponding to the position of the third groove 2114, and by disposing the pressure release member 2111 on the second protrusion 2115 and disposing the first groove section 2112a of the second groove 2112 to penetrate the groove side of the third groove 2114 along the first direction Y, the first groove section 2112a of the second groove 2112 can communicate with the third groove 2114, so that the thermal runaway gas in the second groove 2112 can be released after entering the third groove 2114 through the pressure release member 2111 disposed on the second protrusion 2115, which is beneficial for further improving the smoothness of the exhaust inside the battery cell 20.

Referring to fig. 4, 5, 6 and 7, and further referring to fig. 8 and 9, fig. 8 is a partial cross-sectional view of an insulating member 23 according to some embodiments of the present application, and fig. 9 is an axial side view of a side of the insulating member 23 facing an electrode assembly 22 according to some embodiments of the present application. The insulating member 23 is provided with fourth grooves 232 on both sides in the thickness direction X of the wall portion, the fourth grooves 232 provided on both sides in the thickness direction X of the wall portion of the insulating member 23 are arranged in the first direction Y and communicate with each other between the adjacent fourth grooves 232, and the first grooves 231 communicate with the adjacent fourth grooves 232. The fourth groove 232 disposed on the side of the insulating member 23 facing the wall portion 211 is a first groove 2321, at least one side of the first groove 231 in the first direction Y is provided with the first groove 2321, along the thickness direction X of the wall portion, the second groove sections 2112b are disposed in one-to-one correspondence with the first groove 2321 located on the same side of the first groove 231 in the first direction Y, and at least part of the projection of the second groove sections 2112b is located in the corresponding first groove 2321.

Wherein, the insulating member 23 is provided with the fourth grooves 232 on both sides in the thickness direction X of the wall portion, and the fourth grooves 232 on each side are plural, the fourth grooves 232 disposed on both sides of the insulating member 23 in the thickness direction X of the wall portion are arranged along the first direction Y, the first grooves 231 are located between the plural fourth grooves 232 in the first direction Y, that is, the fourth grooves 232 are disposed on both sides of the first grooves 231 in the first direction Y, and in the first direction Y, each adjacent two fourth grooves 232 are communicated with each other.

The first groove 231 communicates with the adjacent fourth grooves 232, that is, in the first direction Y, the fourth groove 232 closest to the first groove 231 among the plurality of fourth grooves 232 communicates with the first groove 231, and in the embodiment in which the plurality of fourth grooves 232 are provided on the insulating member 23, the structure of the insulating member 23 may be various, for example, each fourth groove 232 may directly communicate with the first groove 231, that is, the plurality of fourth grooves 232 are disposed around the first groove 231, and each fourth groove 232 may directly communicate with the first groove 231, or the plurality of fourth grooves 232 may communicate with each other, and one fourth groove 232 adjacent to the first groove 231 among the plurality of fourth grooves 232 communicates with the first groove 231.

The first groove 2321 is a fourth groove 232 on a side of the insulator 23 facing the wall portion 211 in the thickness direction X of the wall portion, and correspondingly, the fourth groove 232 provided on a side of the insulator 23 facing away from the wall portion 211 is a second groove 2322, i.e., the second groove 2322 is a fourth groove 232 on a side of the insulator 23 facing away from the wall portion 211 in the thickness direction X of the wall portion.

The fourth grooves 232 provided on both sides of the insulating member 23 in the thickness direction X of the wall portion are in communication, that is, the first groove 2321 and the second groove 2322 are in communication with each other, and of course, the first groove 2321 and the second groove 2322 may be in a direct communication structure or an indirect communication structure, for example, in fig. 7, the first grooves 231 are provided with the first groove 2321 and the second groove 2322 on both sides in the first direction Y, the fourth grooves 232 located on the same side of the first groove 231 in the first direction Y are sequentially arranged in the first direction Y and are in communication with each other between two adjacent fourth grooves 232, and the fourth grooves 232 located on both sides of the first groove 231 in the first direction Y are in communication through the first groove 231.

Illustratively, in fig. 7, the first groove 231 is provided with first grooves 2321 on both sides in the first direction Y, and correspondingly, in fig. 5, the wall portion 211 is provided with two second grooves 2112, the two second grooves 2112 being respectively located on both sides of the pressure release member 2111 in the first direction Y, each second groove 2112 being provided corresponding to the first groove 2321 located on the same side of the first groove 231 in the first direction Y.

The second groove sections 2112b are arranged in one-to-one correspondence with the first grooves 2321 located on the same side of the first groove 231 in the first direction Y, and at least part of the projection of the second groove sections 2112b is located within the corresponding first groove 2321, that is, one second groove section 2112b is provided for each first groove 2321 located on the same side of the first groove 231 in the first direction Y, and at least part of each first groove 2321 is arranged opposite to and overlaps with the corresponding second groove section 2112b in the thickness direction X of the wall.

As illustrated in fig. 5 and 7, the first grooves 2321 located on the same side of the first groove 231 in the first direction Y are two and are arranged at intervals along the first direction Y, and correspondingly, the second groove 2112 located on one side of the pressure release member 2111 is provided with two second groove sections 2112b, and the two second groove sections 2112b are arranged at intervals along the first direction Y.

In the present embodiment, by providing the fourth grooves 232 on both sides of the insulating member 23 in the thickness direction X of the wall portion and communicating each other between two adjacent ones of the fourth grooves 232 provided on both sides of the insulating member 23 in the thickness direction X of the wall portion, by providing the first grooves 231 in a structure communicating each other with the adjacent fourth grooves 232, the thermal runaway gas inside the battery cell 20 can be discharged through the pressure release member 2111 after sequentially entering the fourth grooves 232 and the first grooves 231, so that the exhaust path inside the battery cell 20 can be increased, which is advantageous in improving the exhaust smoothness inside the battery cell 20, wherein the fourth grooves 232 provided on the side of the insulating member 23 facing the wall portion 211 in the thickness direction X of the wall portion are the first grooves 2321, through setting up second slot section 2112b and the first groove 2321 that is located the same side of first recess 231 in first direction Y corresponding, and the projection of second slot section 2112b on thickness direction X of wall is located corresponding first groove 2321 in at least partially, in order to realize that the thermal runaway gas that gets into in the first groove 2321 can also pass through second slot section 2112b and first slot section 2112a in proper order and get into in the first recess 231 after the pressure release part 2111 releases, the battery cell 20 adopting this kind of structure can increase the path that the thermal runaway gas in the first groove 2321 gets into in the first recess 231, and can realize that the thermal runaway gas in each first groove 2321 gathers through corresponding second slot section 2112b and gets into first recess 231 after the thermal runaway gas gathers respectively in first slot section 2112a, be favorable to promoting the inside exhaust smoothness of battery cell 20.

According to some embodiments of the present application, as shown in fig. 6 and 7, at least one side of the insulating member 23 is formed with a through-hole 233 along the second direction Z, and at least one fourth groove 232 is correspondingly provided with the through-hole 233 communicating therewith, and the first direction Y, the second direction Z, and the thickness direction X of the wall portion are perpendicular to each other.

In the second direction Z, at least one side of the insulating member 23 is formed with a through hole 233, and at least one fourth groove 232 is correspondingly provided with a through hole 233 in communication with the through hole, that is, the insulating member 23 may be provided with the through hole 233 on only one side in the second direction Z, or may be provided with the through hole 233 on both sides in the second direction Z, and at least one fourth groove 232 is correspondingly provided with the at least one through hole 233 and is mutually communicated.

Illustratively, in fig. 6 and 7, through holes 233 are formed on both sides of the insulating member 23 in the second direction Z, and through holes 233 are formed on both sides of the fourth groove 232 formed on the side of the insulating member 23 facing the wall portion 211 in the thickness direction X of the wall portion, that is, both sides of the first groove 2321 in the second direction Z are formed on both sides of the insulating member 23 in the second direction Z, and of course, in other embodiments, through holes 233 are formed on both sides of the fourth groove 232 formed on the side of the insulating member 23 facing away from the wall portion 211 in the thickness direction X, that is, both sides of the second groove 2322 in the second direction Z are formed on both sides of the insulating member.

It should be noted that, referring to fig. 6 and 7, in the embodiment in which the housing 21 has two first plates 214 opposite to each other in the second direction Z, and the first plates 214 are the walls with the largest area among the walls of the housing 21, the insulating member 23 is formed with a through hole 233 on a side facing the first plates 214, and correspondingly, an exhaust gap 26 is formed between the insulating member 23 and the first plates 214, and the exhaust gap 26 is in communication with the through hole 233, so that the thermal runaway gas in the gap between the electrode assembly 22 and the first plates 214 can enter the fourth groove 232, so that the thermal runaway gas in the gap between the electrode assembly 22 and the first plates 214 can enter the exhaust gap 26 and then enter the first groove 231 through the through hole 233, and then be discharged through the pressure relief member 1, so that the thermal runaway gas in the region with the largest area among the gap between the electrode assembly 22 and the housing 21 can flow and be discharged more easily, and the thermal runaway gas in the region with the largest area among the gap between the electrode assembly 22 and the housing 21 can be lifted smoothly.

In the present embodiment, at least one side of the fourth groove 232 in the second direction Z is correspondingly provided with the through hole 233, so that the thermal runaway gas in the gap between the electrode assembly 22 and the case 21 in the second direction Z can more smoothly enter the fourth groove 232 through the through hole 233, and then enter the first groove 231 and then be discharged through the pressure release member 2111, so that the thermal runaway gas in the gap between the electrode assembly 22 and the case 21 in the second direction Z can be more easily discharged and flowed, and the smoothness of the exhaust inside the battery cell 20 can be effectively improved when the battery cell 20 is thermally out of control, so as to improve the pressure release rate of the battery cell 20.

According to some embodiments of the present application, referring to fig. 7 and 9, at least one fourth groove 232 penetrates a surface of at least one side of the insulating member 23 in the second direction Z to form a through-hole 233 on the insulating member 23.

In the present embodiment, by providing the fourth groove 232 in a structure penetrating at least one side of the insulating member 23 in the second direction Z to form the through-hole 233 in the insulating member 23, the battery cell 20 employing such a structure can promote smoothness of the thermal runaway gas in the gap between the electrode assembly 22 and the case 21 in the second direction Z into the fourth groove 232 through the through-hole 233, so that the smoothness of the internal exhaust of the battery cell 20 at the time of thermal runaway can be promoted, which is advantageous for promoting the pressure release rate of the battery cell 20.

In some embodiments, as shown in fig. 7 and 9, at least one fourth groove 232 penetrates the surfaces of both sides of the insulating member 23 in the second direction Z to form a through hole 233 on both sides of the insulating member 23. That is, at least one fourth groove 232 is provided with a through hole 233 correspondingly at both sides in the second direction Z, respectively.

For example, the plurality of first slots 2321 are respectively provided with through openings 233, and two sides of each first slot 2321 in the second direction Z are respectively provided with through openings 233, in fig. 7, two ends of each first slot 2321 in the second direction Z respectively penetrate through two sides of the insulating member 23, so that two sides of each first slot 2321 in the second direction Z are respectively provided with through openings 233.

In the present embodiment, the fourth groove 232 is configured to penetrate through both sides of the insulating member 23 along the second direction Z, so that both sides of the fourth groove 232 in the second direction Z are correspondingly provided with the through-holes 233, so that smoothness of the thermal runaway gas in the gap between the electrode assembly 22 and the housing 21 in the second direction Z entering the fourth groove 232 through the through-holes 233 can be further improved, and further smoothness of the internal exhaust of the battery cell 20 in the thermal runaway can be further improved, so as to further improve the pressure release rate of the battery cell 20.

Referring to fig. 10, fig. 10 is a schematic structural diagram of an insulating member 23 according to still another embodiment of the present application. Along the second direction Z, a first through hole 234 is provided on a groove sidewall of at least one side of the at least one fourth groove 232, and the first through hole 234 is a through hole 233.

Wherein, the at least one fourth groove 232 is provided with a first through hole 234 on a groove sidewall of at least one side in the second direction Z, and the first through hole 234 penetrates the insulating member 23 along the second direction Z to form a through hole 233 on one side of the insulating member 23 in the second direction Z.

Alternatively, the number of the first through holes 234 provided on the groove sidewall of one side of the at least one fourth groove 232 in the second direction Z may be one or more, and illustratively, in fig. 10, two first through holes 234 are provided on the groove sidewall of one side of the at least one fourth groove 232 in the second direction Z, and the two first through holes 234 on the groove sidewall of the same fourth groove 232 are arranged at intervals along the thickness direction X of the wall portion, which corresponds to that one side of the at least one fourth groove 232 in the second direction Z being correspondingly provided with two through holes 233. Of course, in other embodiments, the first through holes 234 provided on the groove side wall of one side of the fourth groove 232 in the second direction Z may be three, four, five, or the like.

In the present embodiment, by providing the first through-hole 234 on the groove side wall of at least one side of the fourth groove 232 in the second direction Z, the first through-hole 234 penetrates the groove side wall of the fourth groove 232 to form the through-hole 233 on one side of the insulating member 23, and the battery cell 20 adopting this structure can also satisfy the requirement of the structural strength of the insulating member 23 while realizing that the thermal runaway gas in the gap between the electrode assembly 22 and the case 21 can enter into the fourth groove 232 through the through-hole 233, which is advantageous in reducing the risk of breakage or deformation and the like of the insulating member 23 during use.

In some embodiments, as shown in fig. 10, a first through hole 234 is provided on the groove sidewall on both sides of the at least one fourth groove 232 along the second direction Z, so as to form a through hole 233 on both sides of the insulating member 23.

Illustratively, the plurality of first slots 2321 are respectively provided with through holes 233, and two sides of each first slot 2321 in the second direction Z are respectively provided with through holes 233, in fig. 10, then the two opposite slot side walls of each first slot 2321 in the second direction Z are respectively provided with a first through hole 234.

In this embodiment, the first through holes 234 are formed on the groove side walls of the two sides of the fourth groove 232 along the second direction Z, so that the two sides of the fourth groove 232 along the second direction Z are respectively provided with the through holes 233, so that the smoothness of the thermal runaway gas in the gap between the electrode assembly 22 and the casing 21 entering the fourth groove 232 through the through holes 233 can be further improved, and the smoothness of the internal exhaust of the battery cell 20 during thermal runaway can be further improved, so as to further improve the pressure release rate of the battery cell 20.

In some embodiments, referring to fig. 7 and 10, in a plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the insulating member 23 is rectangular, and the length direction of the orthographic projection of the insulating member 23 is a first direction Y, and the width direction of the orthographic projection of the insulating member 23 is a second direction Z.

In the plane perpendicular to the thickness direction X of the wall, the front projection of the insulator 23 is rectangular, that is, the insulator 23 is rectangular parallelepiped, and correspondingly, the first direction Y is the length direction of the insulator 23, the second direction Z is the width direction of the insulator 23, and the thickness direction X of the wall is also the thickness direction of the insulator 23.

In this embodiment, the projection of the insulating member 23 in the thickness direction X of the wall portion is rectangular, and the length direction and the width direction of the projection of the insulating member 23 are the first direction Y and the second direction Z, so that, on one hand, the fourth grooves 232 disposed on both sides of the insulating member 23 in the thickness direction X of the wall portion are structures arranged along the length direction of the insulating member 23, which is beneficial to reducing the difficulty of disposing the fourth grooves 232 on the insulating member 23, and on the other hand, the through holes 233 are located on at least one side of the insulating member 23 in the width direction thereof, so that the through holes 233 are formed on the insulating member 23, and the through holes 233 are disposed corresponding to one or more fourth grooves 232, which is beneficial to reducing the manufacturing difficulty of the insulating member 23.

According to some embodiments of the present application, referring to fig. 7 and 10, at least one first groove 2321 is correspondingly provided with a through-hole 233 communicating therewith.

Here, at least one first groove 2321 is correspondingly provided with a through-hole 233 communicating therewith, that is, at least one fourth groove 232 on a side of the insulating member 23 facing the wall portion 211 in the thickness direction X of the wall portion is correspondingly provided with a through-hole 233, and illustratively, in fig. 7 and 10, a plurality of first grooves 2321 are each correspondingly provided with a through-hole 233, and both sides of each first groove 2321 in the second direction Z are each correspondingly provided with a through-hole 233, and in fig. 7, both ends of each first groove 2321 in the second direction Z penetrate through both sides of the insulating member 23, respectively, and in fig. 10, both groove side walls of each first groove 2321 opposite in the second direction Z are each provided with a first through-hole 234.

Of course, the structure of the battery cell 20 is not limited to this, and in other embodiments, the through hole 233 may be disposed corresponding to the second slot 2322, and referring to fig. 11 and 12, fig. 11 is a schematic structural view of the insulating member 23 provided in still other embodiments of the present application, and fig. 12 is a schematic structural view of the insulating member 23 provided in still other embodiments of the present application. The fourth groove 232 provided on the side of the insulator 23 facing away from the wall 211 in the thickness direction X of the wall is a second groove 2322, and at least one second groove 2322 is correspondingly provided with a through hole 233 communicating therewith.

Here, at least one second groove 2322 is correspondingly provided with a through-hole 233 communicating therewith, that is, at least one fourth groove 232 on a side of the insulating member 23 facing away from the wall portion 211 in the thickness direction X of the wall portion is correspondingly provided with a through-hole 233, and illustratively, in fig. 11 and 12, a plurality of second grooves 2322 are each correspondingly provided with a through-hole 233, and both sides of each second groove 2322 in the second direction Z are each correspondingly provided with a through-hole 233, and in fig. 11, both ends of each second groove 2322 in the second direction Z penetrate through both sides of the insulating member 23, respectively, and in fig. 12, both groove side walls of each second groove 2322 facing in the second direction Z are each provided with a first through-hole 234.

It should be noted that, in other embodiments, the insulating member 23 may further have at least one first slot 2321 and at least one second slot 2322 provided with a through hole 233 correspondingly.

In the present embodiment, through the at least one first groove 2321 is correspondingly provided with the through hole 233, so that the thermal runaway gas in the gap between the electrode assembly 22 and the housing 21 in the second direction Z directly enters the first groove 2321 and then enters the first groove 231 through the second groove 2112, which is beneficial to improving the exhaust smoothness inside the battery cell 20. By providing the through-holes 233 corresponding to the side of the at least one second groove 2312, the second groove 2322 is enabled to collect the thermal runaway gas of the side of the insulating member 23 facing the electrode assembly 22 and also collect the thermal runaway gas in the gap between the electrode assembly 22 and the case 21 in the second direction Z, so as to optimize the path of the thermal runaway gas flow inside the battery cell 20 to promote the pressure release rate of the battery cell 20.

According to some embodiments of the present application, referring to fig. 7 and 8, at least one side of the first groove 231 is provided with a first groove 2321 and a second groove 2322 along the first direction Y.

Wherein, along the first direction Y, at least one side of the first groove 231 is provided with a first groove 2321 and a second groove 2322, that is, a region of the insulating member 23 located at one side of the first groove 231 in the first direction Y is provided with fourth grooves 232 at both sides of the wall portion in the thickness direction X.

In this embodiment, by providing the first groove 2321 and the second groove 2322 on at least one side of the first groove 231 along the first direction Y, on one hand, the first groove 231 and the fourth groove 232 are in a structure of being arranged along the first direction Y, and at least one side of the first groove 231 along the first direction Y is provided with the fourth groove 232, so that the arrangement direction of the plurality of fourth grooves 232 is the same as the arrangement direction of the first groove 231 and the fourth groove 232, which is beneficial to reducing the difficulty of providing the first groove 231 and the fourth groove 232 on the insulating member 23, and on the other hand, the same side of the first groove 231 along the first direction Y can be provided with the first groove 2321 facing the wall portion 211, and the second groove 2322 facing away from the wall portion 211 is also provided, so that the first groove 2321 and the second groove 2322 on the same side of the first groove 231 along the first direction Y cooperate with each other to guide the thermal runaway gas inside the housing 21 into the first groove 231, which is beneficial to improving the internal exhaust smoothness of the battery cell 20.

In some embodiments, referring to fig. 7 and 8, the first grooves 2321 and the second grooves 2322 located on the same side of the first groove 231 are alternately arranged in the first direction Y.

In this embodiment, by arranging the first grooves 2321 and the second grooves 2322 located on the same side of the first groove 231 in the first direction Y in an alternately arranged structure, the fourth grooves 232 disposed facing the wall portion 211 and the fourth grooves 232 disposed facing away from the wall portion 211 in the plurality of fourth grooves 232 located on the same side of the first groove 231 in the first direction Y are alternately arranged, and the insulating member 23 adopting this structure can achieve a better structural strength of the insulating member 23, which is beneficial to reducing the phenomena of breakage or deformation of the insulating member 23 during use, so as to improve the service life of the insulating member 23.

In some embodiments, referring to fig. 7, 8 and 9, first grooves 2321 and second grooves 2322 are provided on both sides of the first groove 231 in the first direction Y. That is, the regions of the insulator 23 on both sides of the first groove 231 in the first direction Y are provided with fourth grooves 232 on both sides of the wall portion in the thickness direction X.

In this embodiment, the first grooves 2321 and the second grooves 2322 are disposed on both sides of the first groove 231 along the first direction Y, so that both sides of the first groove 231 along the first direction Y are provided with the first grooves 2321 facing the wall portion 211 and the second grooves 2322 facing away from the wall portion 211, so that the first grooves 2321 and the second grooves 2322 located on both sides of the first groove 231 along the first direction Y correspondingly cooperate to guide the thermal runaway gas inside the housing 21 into the first groove 231, which is beneficial to further improving the internal exhaust smoothness of the battery cell 20.

In some embodiments, referring to fig. 8 and 9, in the first direction Y, the fourth groove 232 adjacent to the first groove 231 is the second groove 2322. That is, among the plurality of fourth grooves 232 located on the same side of the first groove 231 in the first direction Y and arranged in the first direction Y, the fourth groove 232 closest to the first groove 231 is the second groove 2322, i.e., in the first direction Y, at least one second groove 2322 is a structure disposed between the first groove 2321 and the first groove 231.

It should be noted that, in the embodiment in which the first groove 231 is provided with the first groove 2321 and the second groove 2322 on both sides along the first direction Y, then both sides of the first groove 231 along the first direction Y and the adjacent fourth groove 232 are the second grooves 2322, so that the first groove 231 is located between the two second grooves 2322 along the first direction Y.

In the present embodiment, the fourth groove 232 adjacent to the first groove 231 is set as the second groove 2322 in the first direction Y, so that the first groove 231 and the fourth groove 232 adjacent thereto are respectively disposed on two sides of the insulating member 23 in the thickness direction X of the wall portion, and the insulating member 23 adopting such a structure can improve the structural strength of the insulating member 23, thereby being beneficial to reducing the phenomenon that the insulating member 23 breaks or deforms during use, so as to improve the service life of the insulating member 23.

In some embodiments, referring to fig. 8, the second slot 2322 has a greater slot width than the first slot 2321 in the first direction Y. That is, the fourth groove 232 provided at the side of the insulating member 23 facing the electrode assembly 22 has a larger dimension in the first direction Y than the fourth groove 232 provided at the side of the insulating member 23 facing the wall portion 211.

In the present embodiment, by setting the groove width of the second groove 2322 in the first direction Y to be larger than the groove width of the first groove 2321 in the first direction Y, the structure in which the groove width of the fourth groove 232 provided for facing the electrode assembly 22 is larger than the groove width of the fourth groove 232 provided for facing the wall portion 211 in the first direction Y among the plurality of fourth grooves 232 is made, so that the smoothness of the thermal runaway gas entering the second groove 2322 at the side of the insulating member 23 facing the electrode assembly 22 can be improved to improve the discharge rate of the thermal runaway gas inside the battery cell 20 through the first groove 231 after entering the second groove 2322 while satisfying the structural strength requirement of the insulating member 23.

In some embodiments, referring to fig. 7 and 8, the first grooves 2321 located on the same side of the first groove 231 are plural in the first direction Y; and/or, along the first direction Y, the second grooves 2322 located at the same side as the first groove 231 are plural.

The insulating member 23 may have various structures, and may have one first groove 2321 located on the same side of the first groove 231 in the first direction Y, and a plurality of second grooves 2322, and may have one second groove 2322 located on the same side of the first groove 231 in the first direction Y, and a plurality of first grooves 2321, and may have a plurality of first grooves 2321 and second grooves 2322 located on the same side of the first groove 231 in the first direction Y.

Illustratively, the number of the first grooves 2321 and the second grooves 2322 located at the same side of the first groove 231 in the first direction Y is two, and the two first grooves 2321 and the two second grooves 2322 located at the same side of the first groove 231 in the first direction Y are alternately arranged in turn, however, in other embodiments, the number of the first grooves 2321 and the second grooves 2322 located at the same side of the first groove 231 in the first direction Y may be three, four, five, or the like.

In this embodiment, the first grooves 2321 located on the same side of the first groove 231 in the first direction Y are provided in plurality, so that the thermal runaway gas inside the battery cell 20 can be collected into the first groove 231 through the plurality of first grooves 2321 and then discharged through the pressure release component 2111, which is beneficial to further improving the exhaust path inside the battery cell 20, so as to improve the pressure release rate of the battery cell 20. Likewise, the second grooves 2322 located on the same side of the first groove 231 in the first direction Y are provided in plurality, so that the thermal runaway gas in the battery cell 20 can be collected into the first groove 231 through the plurality of second grooves 2322 and then discharged through the pressure release component 2111, which is beneficial to further improving the exhaust path in the battery cell 20, so as to improve the pressure release rate of the battery cell 20.

According to some embodiments of the present application, referring to fig. 7 and 8, the insulating member 23 has a first partition wall 235, the first partition wall 235 partitions adjacent two fourth grooves 232 in the first direction Y, and a second through hole 2351 is provided in the first partition wall 235, the second through hole 2351 communicating the adjacent two fourth grooves 232.

The first partition wall 235 is a wall formed and shared between two adjacent fourth grooves 232, so that the two adjacent fourth grooves 232 are separated from each other by the first partition wall 235. Illustratively, in fig. 8, the first grooves 2321 and the second grooves 2322 located on the same side of the first groove 231 in the first direction Y are alternately arranged, and correspondingly, the first partition wall 235 is a wall formed between the adjacent first grooves 2321 and second grooves 2322 located on the same side of the first groove 231 in the first direction Y.

The second through hole 2351 is formed to penetrate the first partition wall 235 in the first direction Y such that both ends of the second through hole 2351 in the first direction Y penetrate the groove side surfaces of the adjacent two fourth grooves 232, respectively, such that the adjacent two fourth grooves 232 can communicate through the second through hole 2351.

Alternatively, the number of the second through holes 2351 provided on the first partition wall 235 may be one or more, and as an example, as shown in fig. 7 and 8, two second through holes 2351 are provided on the first partition wall 235 at intervals along the second direction Z.

In the present embodiment, the insulating member 23 has the first partition wall 235 that separates the adjacent two fourth grooves 232 in the first direction Y, that is, the first partition wall 235 is one wall formed and shared between the adjacent two fourth grooves 232 in the first direction Y, so that the adjacent two fourth grooves 232 can communicate with each other by providing the second through holes 2351 penetrating the first partition wall 235 on the first partition wall 235, and the structure is simple and easy to manufacture and process.

According to some embodiments of the present application, referring to fig. 6, 8 and 9, the groove bottom wall of the first groove 2321 is provided with a third through hole 236 extending in the thickness direction X of the wall portion, the third through hole 236 penetrating the groove bottom wall of the first groove 2321, the third through hole 236 communicating with the first groove 2321.

Wherein the third through-hole 236 is a structure penetrating the bottom wall of the first groove 2321 in the thickness direction X of the wall portion, such that the third through-hole 236 can communicate the first groove 2321 with the side of the insulating member 23 facing the electrode assembly 22.

Alternatively, the number of the third through holes 236 provided in the bottom wall of the first slot 2321 may be one or plural, and for example, in fig. 9, the plurality of the third through holes 236 are provided in the bottom wall of the first slot 2321.

In this embodiment, the third through hole 236 penetrating the bottom wall of the first groove 2321 along the thickness direction X of the wall portion is provided on the bottom wall of the first groove 2321, so that the thermal runaway gas on the side of the insulating member 23 facing the electrode assembly 22 can also enter into the first groove 2321 through the third through hole 236 and then be discharged through the second groove 2112, the first groove 231 and the pressure release component 2111 in sequence, thereby further increasing the exhaust path inside the battery cell 20, being beneficial to improving the pressure release rate of the battery cell 20, and improving the use reliability of the battery cell 20.

According to some embodiments of the present application, referring to fig. 8, the insulating member 23 has a second partition wall 237, the second partition wall 237 dividing the first groove 231 and the fourth groove 232, the second partition wall 237 being provided with a fourth through hole 2371, the fourth through hole 2371 communicating the first groove 231 and the fourth groove 232.

The second partition wall 237 is a wall formed and shared between the first groove 231 and the adjacent fourth groove 232, so that the first groove 231 and the adjacent fourth groove 232 are separated from each other by the first partition wall 235. Illustratively, in fig. 8, the plurality of fourth grooves 232 are arranged in the first direction Y, the first grooves 231 are provided with the fourth grooves 232 on both sides in the first direction Y, and the fourth grooves 232 closest to the first grooves 231 in the first direction Y are the second grooves 2322, and correspondingly, the second partition walls 237 are walls formed between the first grooves 231 and the adjacent second grooves 2322 in the first direction Y.

The fourth through hole 2371 is formed to penetrate the second partition wall 237 such that both ends of the fourth through hole 2371 penetrate the wall surfaces of the adjacent first and fourth grooves 231 and 232, respectively, such that the adjacent first and fourth grooves 231 and 232 can communicate through the fourth through hole 2371.

Alternatively, the number of the fourth through holes 2371 provided in the second partition wall 237 may be one or more, and for example, in fig. 8, a plurality of the fourth through holes 2371 are provided in the second partition wall 237.

In the present embodiment, the insulating member 23 has the second partition wall 237 that separates the adjacent first groove 231 and fourth groove 232, that is, the second partition wall 237 is one wall formed and shared between the adjacent first groove 231 and fourth groove 232, so that the adjacent first groove 231 and fourth groove 232 can communicate with each other by providing the fourth through hole 2371 penetrating the second partition wall 237 on the second partition wall 237, which is simple in structure and convenient to manufacture and process.

In some embodiments, referring to fig. 7 and 8, the first groove 231 and the fourth groove 232 are arranged along the first direction Y, the second partition wall 237 includes a first wall 2372, a second wall 2373 and a third wall 2374, the first wall 2372 and the third wall 2374 are spaced apart along the first direction Y, and the second wall 2373 connects the first wall 2372 and the third wall 2374. At least one of the first wall 2372, the second wall 2373, and the third wall 2374 is provided with a fourth through hole 2371.

Wherein the first wall 2372 is closer to the wall 211 than the third wall 2374 in the thickness direction X of the wall, and the thickness direction of the second wall 2373 coincides with the thickness direction X of the wall.

As shown in fig. 7 and 8, the first groove 231 has a stepped groove structure, that is, the first groove 231 includes a first groove 2311 and a second groove 2312 arranged along a thickness direction X of the wall, the first groove 2311 is provided on a surface of the insulating member 23 facing the wall 211, the second groove 2312 is provided on a groove bottom surface of the first groove 2311, correspondingly, a groove side wall shared by the first groove 2311 and an adjacent fourth groove 232 in the first direction Y is a first wall 2372, a groove bottom wall shared by the first groove 2311 and an adjacent fourth groove 232 in the thickness direction X of the wall is a second wall 2373, and a groove side wall shared by the second groove 2312 and an adjacent fourth groove 232 in the first direction Y is a third wall 2374.

At least one of the first wall 2372, the second wall 2373 and the third wall 2374 is provided with a fourth through hole 2371, that is, only one of the first wall 2372, the second wall 2373 and the third wall 2374 may be provided with the fourth through hole 2371, any two of the first wall 2372, the second wall 2373 and the third wall 2374 may be provided with the fourth through hole 2371, and all of the first wall 2372, the second wall 2373 and the third wall 2374 may be provided with the fourth through hole 2371.

Illustratively, in fig. 8, the second wall 2373 and the third wall 2374 are each provided with a fourth through hole 2371, the fourth through hole 2371 provided in the second wall 2373 extends in the thickness direction X of the wall portion and penetrates the second wall 2373, and the fourth through hole 2371 provided in the third wall 2374 extends in the first direction Y and penetrates the third wall 2374.

In the present embodiment, the first groove 231 and the fourth groove 232 are configured to be arranged along the first direction Y, such that the second partition wall 237 is located between the adjacent first groove 231 and fourth groove 232 in the first direction Y, by arranging the second partition wall 237 to be the first wall 2372, the second wall 2373 and the third wall 2374 connected in sequence, and the first wall 2372 and the third wall 2374 are configured to be spaced along the first direction Y, such that the cross section of the second partition portion is configured to be a structure similar to a "Z", and correspondingly, such that the first groove 231 is configured to be a stepped groove, such that the adjacent first groove 231 and fourth groove 232 can be mutually communicated by arranging the fourth through hole 2371 on at least one of the first wall 2372, the second wall 2373 and the third wall 2374, on the one hand, the difficulty of arranging the fourth through hole 2371 on the second partition portion can be reduced, and on the other hand, the second partition wall 237 adopting such a structure can increase the area of arranging the first hole 2371, thereby being capable of lifting the fourth through hole 2371, and smoothly entering the first cell 231 and smoothly flowing into the inside of the first cell and the fourth groove 231, and smoothly lifting the inside of the first cell and the out-of the first cell.

According to some embodiments of the present application, referring to fig. 7 and 8, the groove bottom wall of the first groove 231 is provided with a fifth through hole 238 extending in the thickness direction X of the wall portion, the fifth through hole 238 penetrates the groove bottom wall of the first groove 231, and the fifth through hole 238 communicates with the first groove 231.

Illustratively, a plurality of fifth through holes 238 are provided in the bottom wall of the first recess 231, and the fifth through holes 238 are configured to extend in the thickness direction X of the wall portion and penetrate the bottom wall of the first recess 231, such that the fifth through holes 238 can communicate the first recess 231 with the side of the insulating member 23 facing the electrode assembly 22.

In the embodiment where the first groove 231 has a stepped groove structure and includes the first groove 2311 and the second groove 2312, the fifth through hole 238 is disposed on the bottom wall of the second groove 2312.

It should be noted that, in other embodiments, the fifth through hole 238 may not be disposed on the bottom wall of the first groove 231, so that the thermal runaway gas generated in the thermal runaway of the battery cell 20 is discharged through the pressure release member 2111 after entering the first groove 231 through the fourth groove 232, that is, the first groove 231 is indirectly communicated with the side of the insulating member 23 facing the electrode assembly 22 through the fourth groove 232.

In this embodiment, the fifth through hole 238 penetrating the bottom wall of the first groove 231 along the thickness direction X of the wall portion is provided on the bottom wall of the first groove 231, so that the thermal runaway gas inside the battery cell 20 can also directly enter the first groove 231 through the fifth through hole 238 and then be discharged through the pressure release component 2111, which is beneficial to reducing the blocking of the insulating member 23 to the pressure release component 2111, so as to improve the pressure release rate of the battery cell 20.

According to some embodiments of the present application, referring to FIG. 3, the housing 21 is rectangular, and the maximum dimension of the housing 21 is L, satisfying 310 mm.ltoreq.L.ltoreq.600 mm.

The length direction of the housing 21 is a first direction Y, the height direction of the housing 21 is a thickness direction X of the wall portion, the thickness direction of the housing 21 is a second direction Z, and the dimension of the housing 21 in the first direction Y is larger than the dimension of the housing 21 in the thickness direction X of the wall portion and the dimension of the housing 21 in the second direction Z, and correspondingly, the largest dimension L of the housing 21 is the dimension of the housing 21 in the first direction Y, that is, the largest dimension L of the housing 21 is the length of the housing 21.

Illustratively, the maximum dimension L of the housing 21 may be 310mm、320mm、330mm、340mm、350mm、360mm、370mm、380mm、390mm、400mm、410mm、420mm、430mm、440mm、450mm、460mm、470mm、480mm、490mm、500mm、510mm、520mm、530mm、540mm、550mm、560mm、570mm、580mm、590mm or 600mm, or the like.

In this embodiment, the maximum size of the housing 21 of the battery cell 20 is set to be between 310mm and 600mm, so as to improve the overall size of the battery cell 20, thereby improving the capacitance of the battery cell 20, so as to realize a large-capacity battery cell 20, and further, the battery cell 20 adopting this structure can facilitate the flow and discharge of the thermal runaway gas in the large-capacity battery cell 20 due to the large quantity of thermal runaway gas generated by the large-capacity battery cell 20 when the thermal runaway occurs, so as to improve the pressure release rate of the large-capacity battery cell 20, and be favorable for reducing the risks of untimely pressure release and the like of the large-capacity battery cell 20.

In some embodiments, referring to fig. 3 and 4, electrode assembly 22 is a laminated structure. That is, the electrode assembly 22 is a laminated structure formed by laminating a positive electrode sheet, a separator, and a negative electrode sheet.

Illustratively, in the embodiment of the present application, the lamination direction of the positive electrode sheet, the separator, and the negative electrode sheet of the electrode assembly 22 is the second direction Z.

In the present embodiment, the electrode assembly 22 is configured as a lamination structure, so that the battery cell 20 with a large capacity can be formed according to the actual requirement, which is beneficial to reducing the manufacturing difficulty of the battery cell 20.

According to some embodiments of the present application, referring to fig. 3, 4 and 6, the case 21 may include a case 212 and an end cap 213, the case 212 may have a receiving cavity formed therein with an opening 2121, the electrode assembly 22 may be received in the receiving cavity, the end cap 213 may close the opening 2121, and the end cap 213 may be a wall 211.

Wherein the end cap 213 is a wall portion 211, that is, the pressure relief member 2111 is provided on the end cap 213 of the case 21, and the insulator 23 is provided between the electrode assembly 22 and the end cap 213 of the case 21, and correspondingly, a second groove 2112 is provided on a surface of the end cap 213 facing the side of the electrode assembly 22.

In the present embodiment, by providing the wall portion 211 of the case 21 as the end cap 213 of the case 21 for closing the opening 2121 of the case 212, the battery cell 20 adopting such a structure facilitates the provision of the insulating member 23 between the wall portion 211 and the electrode assembly 22, and the difficulty of providing the pressure release member 2111 and the second groove 2112 on the wall portion 211 can be reduced, thereby facilitating the reduction of the manufacturing difficulty at the battery cell 20 to improve the production efficiency of the battery cell 20.

It should be noted that, in some embodiments, the structure of the battery cell 20 is not limited to this, and the battery cell 20 may be other structures, for example, the housing 21 may include a housing 212 and an end cap 213, the housing 212 includes a side wall and a bottom wall that are integrally formed, the side wall is enclosed around the bottom wall, one end of the side wall is connected to the bottom wall along the thickness direction X of the wall, the other end encloses an opening 2121, the side wall and the bottom wall together define a receiving cavity, the electrode assembly 22 is received in the receiving cavity, the end cap 213 closes the opening 2121, and one wall of the housing 212 is the wall 211.

The housing 212 includes a side wall and a bottom wall that are integrally formed, that is, the housing 212 is manufactured by an integral forming process, such as stamping, casting, or extrusion, that is, the side wall and the bottom wall of the housing 212 are integrally formed.

One wall of the housing 212 is a wall portion 211, that is, the pressure release member 2111 may be provided on the bottom wall of the housing 212 or on one wall of the side wall of the housing 212.

In this embodiment, by setting the wall portion 211 of the housing 21 as the bottom wall of the casing 212, the battery cell 20 adopting this structure can realize that the wall portion 211 of the housing 21 provided with the pressure release member 2111 is far away from the end cover 213, so as to effectively alleviate the phenomenon that the stress generated by the interconnection between the end cover 213 and the casing 212 directly acts on the pressure release member 2111, so as to reduce the influence on the pressure release member 2111, and further be beneficial to reducing the risk that the pressure release member 2111 cracks or the structural strength is reduced under the pulling action of the stress, so as to improve the service life and the service reliability of the battery cell 20.

According to some embodiments of the present application, the present application also provides a battery device 100, the battery device 100 including the battery cell 20 of any one of the above aspects.

As shown in fig. 2, the battery device 100 may further include a case 10, and the battery cells 20 are accommodated in the case 10.

In some embodiments, the case 10 may include a first case body 11 and a second case body 12, the first case body 11 and the second case body 12 being covered with each other, the first case body 11 and the second case body 12 together defining an assembly space for accommodating the battery cell 20.

Alternatively, the second casing body 12 may be a hollow structure with one end opened, the first casing body 11 may be a plate-shaped structure, and the first casing body 11 covers the open side of the second casing body 12, so that the first casing body 11 and the second casing body 12 together define an assembly space; the first tank body 11 and the second tank body 12 may each have a hollow structure with one side opened, and the open side of the first tank body 11 may be closed to the open side of the second tank body 12.

Of course, the case 10 formed by the first case body 11 and the second case body 12 may be various shapes, such as a cylinder, a rectangular parallelepiped, or the like. Illustratively, in fig. 2, the case 10 is of a rectangular parallelepiped structure.

Alternatively, the number of the battery cells 20 may be one or more, which are disposed in the case 10. For example, in fig. 2, a plurality of battery cells 20 are disposed in a case 10 of the battery device 100, and the plurality of battery cells 20 may be connected in series or in parallel or in series-parallel, where a series-parallel refers to both of the plurality of battery cells 20 being connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery device 100 may also be a battery module form formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole and be accommodated in the case 10.

The battery device 100 may further include other structures, for example, the battery device 100 may further include a bus member connecting the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20.

It should be noted that, in some embodiments, the battery device 100 may not include the case 10, the battery device 100 includes a plurality of battery cells 20, and the battery device 100 including the plurality of battery cells 20 may be directly assembled to the power consumption device to provide the power consumption device with the plurality of battery cells 20. That is, the case 10 may be used as a part of an electric device. For example, the electrical device may be the vehicle 1000, the tank 10 may be part of the chassis structure of the vehicle 1000, for example, a portion of the tank 10 may be at least part of the floor of the vehicle 1000, or a portion of the tank 10 may be at least part of the cross member and the side members of the vehicle 1000.

According to some embodiments of the present application, there is also provided an electric device including the battery cell 20 of any one of the above aspects or the battery device 100 of any one of the above aspects, and the battery cell 20 or the battery device 100 is used to provide electric power to the electric device.

The power utilization device may be any of the aforementioned devices or systems using the battery cell 20 or the battery device 100.

Referring to fig. 13, fig. 13 is a cross-sectional view of an energy storage device 2000 according to some embodiments of the present application. The present application also provides an energy storage device 2000, where the energy storage device 2000 includes the battery cell 20 according to any of the above aspects or the battery device 100 according to any of the above aspects.

Illustratively, in fig. 13, the energy storage device 2000 includes an energy storage case 2001 and a plurality of battery devices 100, and the plurality of battery devices 100 are accommodated in the energy storage case 2001, however, in other embodiments, the energy storage device 2000 may also include the energy storage case 2001 and a plurality of battery cells 20, and the plurality of battery cells 20 are accommodated in the energy storage case 2001.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (27)

1. A battery cell, comprising:

a housing having a wall portion provided with a pressure relief member;

An electrode assembly disposed within the housing; and

An insulating member disposed between the wall portion and the electrode assembly, the insulating member facing one side of the wall portion and having a first groove provided at a position corresponding to the pressure relief member;

Wherein a second groove is provided along a thickness direction of the wall portion, the wall portion facing one side of the electrode assembly, the second groove including a first groove section and a plurality of second groove sections, the first groove section extending in a first direction, a portion of a projection of the first groove section onto the insulating member along the thickness direction of the wall portion being located in the first groove, the second groove sections are distributed at intervals along the first direction, the second groove sections are communicated with the first groove sections, the extending direction of the second groove sections is intersected with the extending direction of the first groove sections, and the extending directions of the first direction and the second groove sections are perpendicular to the thickness direction of the wall portion.

2. The battery cell according to claim 1, wherein the wall portion is provided with two second grooves on a side facing the electrode assembly in a thickness direction of the wall portion, the two second grooves being located on both sides of the pressure release member in the first direction, respectively.

3. The battery cell according to claim 1, wherein an orthographic projection of the second groove does not overlap an orthographic projection of the pressure release member in the same plane perpendicular to a thickness direction of the wall portion.

4. The battery cell of claim 1, wherein the second channel section extends in a second direction, a dimension of the second channel section in the second direction being greater than a dimension of the first channel section in the second direction, the second direction being perpendicular to the thickness direction of the wall portion and the first direction.

5. The battery cell according to claim 1, wherein a first protrusion is formed at a position of a side of the wall portion facing away from the insulating member and corresponding to the second groove in a thickness direction of the wall portion.

6. The battery cell according to claim 5, wherein a third groove is provided on a side of the wall portion facing the insulating member in a thickness direction of the wall portion, and a second protrusion is formed on a side of the wall portion facing away from the insulating member and corresponding to the third groove, the second protrusion being connected to the first protrusion, and the pressure release member is provided on the second protrusion;

Wherein the first groove section penetrates a groove side surface of the third groove along the first direction.

7. The battery cell according to any one of claims 1 to 6, wherein the insulating member is provided with fourth grooves on both sides in a thickness direction of the wall portion, the fourth grooves provided on both sides in the thickness direction of the wall portion of the insulating member are arranged in the first direction and communicate with each other between the adjacent fourth grooves, the first grooves communicate with the adjacent fourth grooves;

the fourth groove is arranged on one side of the insulating piece facing the wall part and is a first groove, the first groove is arranged on at least one side of the first groove in the first direction, the second groove sections are arranged in one-to-one correspondence with the first grooves on the same side of the first groove in the first direction along the thickness direction of the wall part, and at least part of projection of the second groove sections is positioned in the corresponding first grooves.

8. The battery cell according to claim 7, wherein a through hole is formed in at least one side of the insulating member in the second direction, the through holes communicating therewith are provided in correspondence with at least one of the fourth grooves, and the first direction, the second direction, and the thickness direction of the wall portion are perpendicular to each other.

9. The battery cell of claim 8, wherein at least one of the fourth grooves extends through a surface of at least one side of the insulating member in the second direction to form the through-hole in the insulating member.

10. The battery cell of claim 8, wherein a first through-hole is provided in a groove sidewall of at least one side of at least one of the fourth grooves in the second direction, the first through-hole being the through-hole.

11. The battery cell according to claim 8, wherein the orthographic projection of the insulating member is rectangular in a plane perpendicular to the thickness direction of the wall portion, and the length direction of the orthographic projection of the insulating member is the first direction, and the width direction of the orthographic projection of the insulating member is the second direction.

12. The battery cell according to claim 8, wherein the fourth groove provided on a side of the insulating member facing away from the wall portion in a thickness direction of the wall portion is a second groove;

wherein at least one first groove is correspondingly provided with the through hole communicated with the first groove; and/or

At least one of the second grooves is correspondingly provided with the through hole communicated with the second groove.

13. The battery cell of claim 12, wherein at least one side of the first groove is provided with the first groove and the second groove along the first direction.

14. The battery cell of claim 13, wherein the first and second grooves on the same side of the first groove alternate in the first direction.

15. The battery cell of claim 13, wherein the fourth groove adjacent to the first groove is the second groove in the first direction.

16. The battery cell of claim 13, wherein the second slot has a greater slot width than the first slot in the first direction.

17. The battery cell of claim 13, wherein the first groove is located on the same side of the first groove in the first direction; and/or

The second grooves are located on the same side of the first groove along the first direction.

18. The battery cell according to claim 7, wherein the insulating member has a first partition wall that separates adjacent two of the fourth grooves in the first direction, and a second through hole is provided in the first partition wall, the second through hole communicating the adjacent two of the fourth grooves.

19. The battery cell according to claim 7, wherein a bottom wall of the first groove is provided with a third through hole extending in a thickness direction of the wall portion, the third through hole penetrating a bottom wall of the first groove.

20. The battery cell according to claim 7, wherein the insulating member has a second partition wall that partitions the first groove and the fourth groove, the second partition wall being provided with a fourth through hole that communicates the first groove and the fourth groove.

21. The battery cell of claim 20, wherein the first groove and the fourth groove are arranged along the first direction, the second partition wall comprises a first wall, a second wall, and a third wall, the first wall and the third wall are arranged at intervals along the first direction, and the second wall connects the first wall and the third wall;

Wherein at least one of the first wall, the second wall, and the third wall is provided with the fourth through hole.

22. The battery cell according to any one of claims 1 to 6, wherein a bottom wall of the first groove is provided with a fifth through hole extending in a thickness direction of the wall portion, the fifth through hole penetrating a bottom wall of the first groove.

23. The battery cell of any one of claims 1-6, wherein the housing is cuboid and has a largest dimension L, with 310mm L600 mm, and the electrode assembly is a laminated structure.

24. The battery cell of any one of claims 1-6, wherein the housing comprises:

A case having an accommodating chamber formed therein, the electrode assembly being accommodated in the accommodating chamber;

An end cap closing the opening;

Wherein the end cap is the wall portion; or (b)

One wall of the housing is the wall portion.

25. A battery device comprising a battery cell according to any one of claims 1-24.

26. An electrical device comprising a battery cell according to any one of claims 1 to 24 or a battery device according to claim 25.

27. An energy storage device comprising a battery cell according to any one of claims 1 to 24 or a battery device according to claim 25.