CN219321573U - Battery monomer, battery and electric equipment - Google Patents

Abstract

The application relates to a battery monomer, a battery and electric equipment. The battery unit comprises a first adapter, a second adapter and a fixing piece. The first adapter is used for connecting the electrode assembly, the second adapter comprises a first connecting section and a second connecting section, the first connecting section is used for connecting the electrode terminal, and the second connecting section is connected with the first adapter. The fixing member is configured to fix the second connection section to the first adapter member. The battery cell has higher reliability.

Description

Battery monomer, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles.

In addition to improving the energy density of batteries, reliability is also a non-negligible problem in the development of battery technology. Therefore, how to improve the reliability of the battery is a technical problem to be solved in the battery technology.

Disclosure of Invention

The application provides a battery monomer, battery and consumer, this battery monomer has higher reliability.

The application is realized by the following technical scheme:

in a first aspect, the present application provides a battery cell, including a first adapter, a second adapter, and a fixing member. The first adapter is used for connecting the electrode assembly, the second adapter comprises a first connecting section and a second connecting section, the first connecting section is used for connecting the electrode terminal, and the second connecting section is connected with the first adapter. The fixing member is configured to fix the second connection section to the first adapter member.

According to the battery monomer of this application embodiment, be fixed in first changeover portion through the mounting with the second linkage segment, play the effect of constraint to the second linkage segment, the effort that second changeover portion and first changeover portion received can be undertaken to the mounting, reduces the connection position damage inefficacy of second linkage segment and first changeover portion, causes first changeover portion and second changeover portion to break away from each other, leads to the risk of electrical connection inefficacy for the battery monomer has higher reliability.

According to some embodiments of the present application, the fixing member includes a body and a protruding portion, along a thickness direction of the first adapter, the second connection section is located between the body and the first adapter, the protruding portion is disposed on a side of the body facing the first adapter and protrudes from the body, the first adapter is provided with a first through hole corresponding to the protruding portion, and a portion of the protruding portion is inserted into the first through hole so that the body and the first adapter clamp the second connection section.

In the above scheme, the second linkage segment is located between body and the first transfer piece, and the first through-hole is located in the partly interpolation of bulge to body and first transfer piece cooperation centre gripping second linkage segment of being convenient for play the guard action to the junction of second linkage segment and first transfer piece, reduce the risk that the junction atress of second linkage segment and first transfer piece is damaged.

According to some embodiments of the application, the second connecting section is connected with the first connector to form a connecting portion, and a projection of the body on the first connector at least partially overlaps with the connecting portion along a thickness direction of the first connector.

In the scheme, the projection of the body on the first adapter is at least partially overlapped with the connecting part, so that the external force born by the connecting part can be effectively born, and the risk of stress damage of the connecting part is reduced.

According to some embodiments of the application, the projection of the body onto the first adapter covers the connection in the thickness direction of the first adapter.

In the above scheme, the projection of body on first adaptor covers connecting portion, namely, the body has great overlap area with connecting portion, can effectively bear the external force that connecting portion received, reduces the risk that connecting portion atress was damaged.

According to some embodiments of the present application, the second connection section is provided with a second through hole corresponding to the protruding portion, and the protruding portion is inserted into the second through hole and the first through hole.

In the scheme, the protruding part passes through the second connecting section and the first adapter simultaneously, so that the body and the first adapter have a good clamping effect on the second connecting section, and the risk of damage of the connecting part is reduced. When the fixing piece is a conductive part, the first adapter piece and the second adapter piece can be better electrically connected.

According to some embodiments of the present application, the protrusion has a first end far away from the body, the first end is located at a side of the first adapter facing away from the body, and the first end is formed with a limiting protrusion, and the limiting protrusion is abutted with the first adapter.

In the above scheme, the first end is located one side of deviating from the body of first transition piece after passing first through-hole, and spacing arch forms in first end and with first transition piece butt to make body and first transition piece can press from both sides tight second linkage segment, have better protection effect to connecting portion.

According to some embodiments of the present application, the protrusion is integrally formed with the body.

In the scheme, the protruding part and the body are integrally formed, so that the processing and manufacturing are facilitated, and the protruding part and the body are firmly connected.

According to some embodiments of the present application, the first adapter includes a main body and two first connection regions for connection with the electrode assembly, the second connection section is connected to the main body, the second connection section is located between the two first connection regions, and the fixing member is located between the two first connection regions.

In the above scheme, the second connecting section is located between two first connecting regions, and the assembly space is reasonably distributed, so that the connection stress of the first adapter and the electrode assembly is balanced, and the first adapter and the second connecting section are connected stably.

According to some embodiments of the present application, the body is located on a side of the first adapter facing away from the electrode assembly.

In the above scheme, the body is located at one side of the first transfer member, which is away from the electrode assembly, so that the risk of interference between the fixing member and the electrode assembly after the fixing member and the first transfer member are assembled can be reduced, and the first transfer member is connected with the electrode assembly conveniently.

According to some embodiments of the present application, the first connection region protrudes from a side of the main body facing the electrode assembly, and the protrusion protrudes from a side of the main body facing the electrode assembly and does not exceed the first connection region.

In the above scheme, the one end of keeping away from the body of bulge is located the one side of main part towards electrode assembly to the bulge surpasses the height of the protruding main part of main part and is less than the height of first connecting region, is convenient for reduce assembly height, reduces the space occupation of the structure after mounting and the assembly of first connecting piece, is convenient for first connecting region and electrode assembly to be connected.

According to some embodiments of the application, the material of the fixing element is the same as the material of the second adapter element.

In the above scheme, the material of mounting is the same with the material of second adaptor, and the mounting is fixed in first adaptor with the second linkage segment for have better overflow ability between first adaptor and the second adaptor.

According to some embodiments of the present application, the second interposer is a multilayer structure and includes a plurality of conductive sheets disposed in a stack.

In the scheme, the second adapter is of a multi-layer structure, so that the second adapter can be bent conveniently.

According to some embodiments of the present application, the strength of the fastener is greater than the strength of the single layer conductive sheet.

In the above scheme, the intensity of mounting is greater than the intensity of individual layer conducting strip, and the connection reliability of being convenient for make second adaptor and first adaptor is higher, and simultaneously, the intensity of individual layer conducting strip is lower, can reduce the degree of difficulty that the second adaptor was bent for first adaptor.

According to some embodiments of the present application, the second adaptor further comprises a third connecting section, the third connecting section connects the first connecting section and the second connecting section, the third connecting section is bent relative to the second connecting section, the first connecting section is bent relative to the third connecting section, and the first connecting section and the second connecting section are located on two sides of the third connecting section in the thickness direction.

In the above-mentioned scheme, the second adaptor can be S-shaped bending for the extension of bending of each layer conducting strip is the same, namely, the both ends edge of each layer conducting strip flushes, and then makes each layer conducting strip atress of second adaptor even on the one hand, difficult emergence fracture, on the other hand control the second adaptor highly after bending, make the battery monomer have higher energy density, avoid multilayer structure to appear layering phenomenon, and the inlayer appears the fold easily, and then leads to highly increasing after bending, occupy installation space and the problem of the single assembly of battery of inconvenience.

According to some embodiments of the application, the first adapter is a single layer structure.

In the above scheme, the first adapter is of a single-layer structure, so that the connection reliability of the first adapter and the electrode assembly is high.

In a second aspect, embodiments of the present application further provide a battery, where the battery includes the battery cell provided in any one of the embodiments above.

In a third aspect, an embodiment of the present application further provides an electric device, where the electric device includes the battery monomer provided in any one of the embodiments.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

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 limiting the scope, and that 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 provided in some embodiments of the present application;

FIG. 3 is an exploded view of a battery cell according to some embodiments of the present application;

fig. 4 is a cross-sectional view of a first adapter, a second adapter, and an electrode terminal according to some embodiments of the present disclosure;

FIG. 5 is a schematic illustration of a connection of a second adapter to a first adapter in an expanded state according to some embodiments of the present disclosure;

FIG. 6 is a schematic structural view of a first adapter, a second adapter, and a fixing member according to some embodiments of the present disclosure;

FIG. 7 is a schematic diagram illustrating an assembly of a fixing member (in a deployed state) with a second connecting section and a first adapter according to some embodiments of the present disclosure;

FIG. 8 is an enlarged view of a portion of FIG. 7 at A;

fig. 9 is a schematic diagram illustrating the cooperation between the second connection section and the protrusion according to some embodiments of the present application.

Icon: 100-cell; 10-a box body; 11-a first sub-tank; 12-a second sub-tank; 20-battery cells; 21-a housing; 211-a housing; 212-end caps; 22-electrode assembly; 23-electrode terminals; 24-insulating member; 25-a first adapter; 251-first through holes; 252-body; 252 a-a second surface; 252 b-a third surface; 253—a first connection region; 26-a second adapter; 26 a-a first inflection region; 26 b-a second inflection region; 261-first connection segment; 262-a second connecting section; 2621-a second through hole; 263-third connecting section; 264-conductive sheets; 27-a fixing piece; 271-a body; 2711-first surface; 272-a protrusion; 272 a-a first end; 272 b-a second end; 273-limit bump; 30-connecting part; f1-a first bending axis; f2-a second bending axis; 200-a controller; 300-motor; 1000-vehicle.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the 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. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

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 and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. 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. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with 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 terms in this application will be understood by those of ordinary skill in the art as the case may be.

The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.

The term "plurality" as used herein refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In some embodiments, the battery may be a battery module, and when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form one battery module.

In some embodiments, the battery may be a battery pack including a case and a battery cell, the battery cell or battery module being housed in the case.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

In some embodiments, the battery may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

In this embodiment of the present application, the battery cell may be a secondary battery, and the secondary battery refers to a battery cell that can activate the active material by charging after discharging the battery cell and continue to use.

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, or the like, which is not limited in the embodiment of the present 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, silver-surface-treated aluminum or 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.

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 or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used.

In some embodiments, the anode current collector has two surfaces opposing in a thickness direction thereof, 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 electrode active material for a battery 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 separator is a separator film. The type of the separator is not particularly limited, and any known porous separator having good chemical stability and mechanical stability may be used.

As an example, the main material of the separator may be at least one selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator may be a single-layer film or a multilayer composite film, and is not particularly limited. When the separator is a multilayer composite film, the materials of the respective layers may be the same or different, and are not particularly limited. 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 electrode assembly is a rolled structure. The positive plate and the negative plate are wound into a winding structure.

In some embodiments, the electrode assembly is a lamination stack.

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.

In some embodiments, the case includes an end cap and a case, the case is provided with an opening, and the end cap closes the opening to form a closed space for accommodating the electrode assembly, electrolyte, and the like. The housing may be provided with one or more openings. One or more end caps may also be provided.

In some embodiments, at least one electrode terminal is provided on the case, and the electrode terminal is electrically connected with the tab of the electrode assembly. The electrode terminal may be directly connected to the tab, or may be indirectly connected to the tab through the adapter. The electrode terminal may be provided on the terminal cover or may be provided on the case.

In some embodiments, an explosion proof valve is provided on the housing. The explosion-proof valve is used for discharging the internal pressure of the battery cell.

The development of battery technology is taking into consideration various design factors such as energy density, discharge capacity, charge-discharge rate and other performance parameters, and the reliability of the battery.

The battery cell includes a switching member connected with the electrode terminal and the electrode assembly. In some embodiments, the switching part includes a first switching part for connecting the electrode assembly and a second switching part, the first connecting section of the second switching part is for connecting the electrode terminal, and the second connecting section of the second switching part is connected with the first switching part. The second connecting section is typically welded to the first adapter by ultrasonic bonding. In the use of the battery cell, the adapting part is easily subjected to impact force, for example, the acting force of the end cover acting on the adapting part, or the acting force of the electrode assembly acting on the adapting part, so that the stress at the connecting part of the first adapting part and the second adapting part is easily concentrated, the connecting part of the second connecting section and the first adapting part is damaged (such as cracked), and the electric connection between the first adapting part and the second adapting part is invalid, the reliability of the battery cell is influenced, and the reliability of the battery cell is lower. Especially when the second adapter comprises a plurality of layers of conducting strips, in order to ensure the bending strength of the second adapter, the ultrasonic welding power cannot be too high, otherwise, the conducting strips are easy to break after welding; however, the welding strength of the conductive sheet is easily insufficient under certain power by ultrasonic welding, and the conductive sheet is easily dropped under the stress, so that the electrical connection is invalid, and the reliability of the battery cell is lower.

In view of this, in order to solve the connection position atress of second adaptor and first adaptor damage, lead to the electrical connection inefficacy of second adaptor and first adaptor, and then lead to the lower problem of the reliability of battery monomer, this application embodiment provides a technical scheme, increases the mounting, and the mounting is fixed in first adaptor with the second linkage segment, plays the constraint effect to the second linkage segment.

In such battery monomer, the effort that second changeover portion and first changeover portion received can be transmitted to the mounting, and the mounting can share the effort that second linkage segment received with first changeover portion, reduces the junction portion damage of second linkage segment and first changeover portion, causes second linkage segment and first changeover portion to break away from each other, leads to the risk of electrical connection inefficacy for battery monomer has higher reliability.

The battery cell disclosed by the embodiment of the application can be used in electric equipment such as vehicles, ships or aircrafts, but is not limited to the electric equipment. The power supply system with the battery cells, batteries and the like disclosed by the application can be used for forming the electric equipment.

The embodiment of the application provides electric equipment using a battery as a power supply, and the electric equipment can be, but is not limited to, a mobile phone, a tablet personal computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, 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 take a powered device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present 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 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. Battery 100 may be used to power vehicle 1000, for example, battery 100 may be used as an operating power source for vehicle 1000, for the circuitry of vehicle 1000, such as for the operational power requirements of vehicle 1000 during start-up, navigation, and operation.

The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 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, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery according to some embodiments of the present application. The battery 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 accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first sub-case 11 and a second sub-case 12, the first sub-case 11 and the second sub-case 12 being covered with each other, the first sub-case 11 and the second sub-case 12 together defining an accommodating space for accommodating the battery cell 20. The second sub-box 12 may have a hollow structure with an opening at one end, the first sub-box 11 may have a plate-shaped structure, and the first sub-box 11 covers the opening side of the second sub-box 12, so that the first sub-box 11 and the second sub-box 12 together define an accommodating space; the first sub-tank 11 and the second sub-tank 12 may be hollow structures each having one side opened, and the opening side of the first sub-tank 11 may be closed to the opening side of the second sub-tank 12.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to 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 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

The battery cell 20 may be a secondary battery or a primary battery; the battery cell 20 may also be a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery, but is not limited thereto.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell according to some embodiments of the present application. As shown in fig. 3, the battery cell 20 includes a case 21, an electrode assembly 22, and an electrode terminal 23. The case 21 includes a housing 211 and an end cap 212, the housing 211 having an opening, the end cap 212 closing the opening to isolate the internal environment of the battery cell 20 from the external environment.

The case 211 is a component for cooperating with the end cap 212 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to accommodate the electrode assembly 22, the electrolyte, and other components. The housing 211 and the end cap 212 may be separate components. The housing 211 may be a variety of shapes and sizes. Specifically, the shape of the case 211 may be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 211 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The end cap 212 refers to a member that is covered at the opening of the case 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 212 may be adapted to the shape of the housing 211 to fit the housing 211. Optionally, the end cap 212 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the end cap 212 is not easy to deform when being extruded and collided, so that the battery cell 20 can have a higher structural strength, and the safety performance can be improved. The end cap 212 may be provided with functional parts such as the electrode terminals 23. The electrode terminals 23 may be used to be electrically connected with the electrode assembly 22 for outputting or inputting electric power of the battery cell 20. The material of the end cap 212 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiments of the present application. In some embodiments, an insulator 24 may also be provided on the inside of the end cap 212, and the insulator 24 may be used to isolate electrical connection components within the housing 211 from the end cap 212 to reduce the risk of shorting. By way of example, the insulator 24 may be plastic, rubber, or the like.

The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 22 may be contained within the housing 211. The electrode assembly 22 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet, and is used for separating the positive electrode sheet and the negative electrode sheet so as to avoid an internal short circuit between the positive electrode sheet and the negative electrode sheet. The parts of the positive pole piece and the negative pole piece with active substances form a main body part of the electrode assembly, and the parts of the positive pole piece and the negative pole piece without active substances form electrode lugs respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected to the electrode terminal 23 to form a current loop.

Referring to fig. 3, and further referring to fig. 4 to fig. 6, fig. 4 is a cross-sectional view of the assembled first adaptor, second adaptor and electrode terminal according to some embodiments of the present application, fig. 5 is a schematic view of the connection between the second adaptor and the first adaptor in the unfolded state according to some embodiments of the present application, and fig. 6 is a schematic view of the structure of the first adaptor, second adaptor and fixing member according to some embodiments of the present application. According to some embodiments of the present application, there is provided a battery cell 20, the battery cell 20 including a first adapter 25, a second adapter 26, and a fixture 27. The first adapter 25 is used to connect the electrode assembly 22, the second adapter 26 includes a first connection section 261 and a second connection section 262, the first connection section 261 is used to connect the electrode terminal 23, and the second connection section 262 is connected with the first adapter 25. The securing member 27 is configured to secure the second connecting segment 262 to the first adapter member 25.

The first adapter 25, the second adapter 26 and the fixing member 27 may be separately provided members.

The second connecting section 262 and the first adaptor 25 can be welded and connected, so that the second connecting section 262 and the first adaptor 25 are firmly connected, and better overcurrent capacity is achieved between the first adaptor 25 and the second adaptor 26.

The fixing member 27 is a member for fixing the second connecting section 262 to the first adapter member 25. The material of the fixing member 27 may be a conductive material, for example, metal; alternatively, the fixing member 27 may be made of an electrically insulating material, such as plastic. In some embodiments, the fixing member 27 may cooperate with the first adapter member 25 to fix the second connection section 262 to the first adapter member 25, e.g., the fixing member 27 may clamp the second connection section 262 with the first adapter member 25, such as by riveting the fixing member 27 to the first adapter member 25; alternatively, the fixing member 27 is disposed around the structure of the second connecting section 262 and the first adapter 25 after connection, for example, the fixing member 27 is an adhesive tape.

According to the battery unit 20 of the embodiment of the application, the second connecting section 262 is fixed on the first adapter 25 through the fixing piece 27, the second connecting section 262 is restrained, the fixing piece 27 can bear acting force borne by the second adapter 26 and the first adapter 25, the damage failure of the connecting part of the second connecting section 262 and the first adapter 25 is reduced, the second adapter 26 and the first adapter 25 are separated from each other, and the risk of failure of electrical connection is caused, so that the battery unit 20 has higher reliability.

Referring to fig. 3, and further referring to fig. 7 and 8, fig. 7 is an assembly schematic diagram of the fixing member (in the unfolded state of the second adaptor), the second connecting section and the first adaptor according to some embodiments of the present application, and fig. 8 is a partial enlarged view of a portion a in fig. 7. According to some embodiments of the present application, the fixing member 27 includes a body 271 and a protruding portion 272, along a thickness direction Z of the first adapter 25, the second connecting section 262 is located between the body 271 and the first adapter 25, the protruding portion 272 is disposed on a side of the body 271 facing the first adapter 25 and protrudes from the body 271, the first adapter 25 is provided with a first through hole 251 corresponding to the protruding portion 272, and a portion of the protruding portion 272 is inserted into the first through hole 251, so that the body 271 and the first adapter 25 clamp the second connecting section 262.

In the figure, the direction indicated by the letter Z is the thickness direction of the first adapter 25.

The body 271 is a portion of the fixing member 27 for connecting with the second connecting section 262, and a larger contact area can be provided between the body 271 and the second connecting section 262, so as to fix the second connecting section 262 to the first adaptor 25.

The body 271 may include a first surface 2711 facing the first adapter 25, with the protrusion 272 protruding from the first surface 2711. One end of the protruding portion 272 is connected to the body 271, and the other end of the protruding portion 272 may pass over or through the second connecting section 262 and be connected to the first adapter 25. The protruding portion 272 is connected to the body 271, and the protruding portion 272 may be fixed to the body 271, for example, the protruding portion 272 may be welded, riveted, adhered, or fastened to the body 271, or the protruding portion 272 may be integrally formed with the body 271.

A portion of the protrusion 272 is inserted into the first through hole 251 so that the body 271 and the first adapter 25 clamp the second connecting section 262", and may be that one end of the protrusion 272 passes through the first through hole 251 and is riveted with the first adapter 25 so that the body 271 and the first adapter 25 are respectively contacted with the second connecting section 262; alternatively, an end of the protruding portion 272 remote from the body 271 is located within the first through hole 251, and the protruding portion 272 is interference fit with the first through hole 251 or is screw-coupled with the first through hole 251 such that the body 271 and the first adapter 25 are respectively in contact with the second connecting section 262; alternatively, the protruding portion 272 is injection molded on the first adapter 25, and a portion of the protruding portion 272 is located in the first through hole 251, so that the body 271 and the first adapter 25 are respectively contacted with the second connecting section 262, so that the protruding portion 272 and the first adapter 25 are firmly connected.

In some embodiments, the tab 272 may be riveted with the first adapter 25 such that the tab 272 is securely connected with the first adapter 25.

The second connecting section 262 is located between the body 271 and the first adaptor 25, and a part of the protruding portion 272 is inserted into the first through hole 251, so that the body 271 and the first adaptor 25 can clamp the second connecting section 262 in a matched mode, the connection part of the second connecting section 262 and the first adaptor 25 is protected, and the risk of stress damage of the connection part of the second connecting section 262 and the first adaptor 25 is reduced.

Referring to fig. 8, according to some embodiments of the present application, the second connecting section 262 is connected to the first adaptor 25 to form the connecting portion 30, and along the thickness direction Z of the first adaptor 25, the projection of the body 271 on the first adaptor 25 at least partially overlaps with the connecting portion 30.

The connecting portion 30 may be a welded seal formed after the second connecting section 262 is welded to the first adaptor 25, that is, the second connecting section 262 may be welded to the first adaptor 25, so that, on one hand, current is facilitated to pass through a connection portion between the second connecting section 262 and the first adaptor 25, and on the other hand, the second connecting section 262 is firmly connected to the first adaptor 25.

The projection of the body 271 onto the first adapter 25 in the thickness direction Z of the first adapter 25 at least partially overlaps the connecting portion 30, i.e. the body 271 at least partially overlaps the connecting portion 30 as seen in the thickness direction Z of the first adapter 25. For example, a part of the projection of the body 271 onto the first adapter 25 overlaps a part of the connecting portion 30, or all of the projection of the body 271 onto the first adapter 25 overlaps all of the connecting portion 30, or all of the projection of the body 271 onto the first adapter 25 overlaps a part of the connecting portion 30, or all of the projection of the body 271 onto the first adapter 25 overlaps all of the connecting portion 30.

In the above-mentioned scheme, the projection of the body 271 on the first adapter 25 at least partially overlaps with the connecting portion 30, so that the external force applied to the connecting portion 30 can be effectively borne, and the risk of stress damage to the connecting portion 30 is reduced.

Referring to fig. 8, according to some embodiments of the present application, along a thickness direction Z of the first adapter 25, a projection of the body 271 on the first adapter 25 covers the connection portion 30.

Along the thickness direction Z of the first adapter 25, the projection of the body 271 onto the first adapter 25 covers the connection portion 30, and may be such that the projection of the body 271 onto the first adapter 25 has a larger area relative to the connection portion 30, that is, the projection of the body 271 onto the first adapter 25 has an area greater than or equal to the area of the connection portion 30.

The projection of the body 271 on the first adaptor 25 along the thickness direction Z of the first adaptor 25 covers the connecting portion 30, that is, the body 271 and the connecting portion 30 have a larger overlapping area, so that the external force applied to the connecting portion 30 can be effectively borne, and the risk of stress damage to the connecting portion 30 is reduced.

Referring to fig. 9, fig. 9 is a schematic diagram illustrating the cooperation between the second connecting section and the protruding portion according to some embodiments of the present disclosure. According to some embodiments of the present application, the second connection section 262 is provided with a second through hole 2621 corresponding to the protrusion 272, and the protrusion 272 is inserted into the second through hole 2621 and the first through hole 251.

The second through hole 2621 is a through hole disposed on the second connecting section 262, and the second through hole 2621 may penetrate through the second connecting section 262 along the thickness direction Z of the first adapter 25. The second through hole 2621 may be disposed corresponding to the first through hole 251, and the protrusion 272 may be disposed through the second through hole 2621.

In some embodiments, the protruding portion 272 may be connected with the first adapter 25 after passing through the second through hole 2621 and the first through hole 251. In other embodiments, the protruding portion 272 may be connected with the second connection section 262 after passing through the first through hole 251 and the second through hole 2621.

In the above-mentioned scheme, the protrusion 272 passes through the second connecting section 262 and the first adaptor 25 at the same time, so that the body 271 and the first adaptor 25 have a better clamping effect on the second connecting section 262, and the risk of damaging the connecting portion 30 is reduced. When the fixing member 27 is a conductive member, the first and second adapters 25 and 26 can be made to have a good electrical connection.

Referring to fig. 8 and 9, according to some embodiments of the present application, the protruding portion 272 has a first end 272a far away from the body 271, the first end 272a is located on a side of the first adapter 25 far away from the body 271, the first end 272a is formed with a limiting protrusion 273, and the limiting protrusion 273 abuts against the first adapter 25.

The first end 272a is an end of the protruding portion 272 away from the body 271, and after the first end 272a passes through the first through hole 251, the limiting protrusion 273 abuts against the first adaptor 25, and the limiting protrusion 273 is located on a side of the first adaptor 25 facing away from the second connecting section 262.

The protruding portion 272 further has a second end 272b, the second end 272b is connected to the body 271, the first end 272a and the second end 272b are two ends of the protruding portion 272 that are disposed opposite to each other in the thickness direction Z of the first adapter 25, and the protruding portion 272 may be disposed in the thickness direction Z of the first adapter 25, that is, the length direction of the protruding portion 272 may be parallel to the thickness direction Z of the first adapter 25.

The limiting protrusion 273 abuts against the first adaptor 25, so that the protrusion 272 applies a pulling force to the body 271 towards the first adaptor 25, so that the body 271 and the first adaptor 25 cooperate to clamp the second connecting section 262, and limit the second connecting section 262 in the thickness direction Z of the first adaptor 25.

The limiting protrusion 273 abuts against the first adapter 25, and the protruding portion 272 may be riveted to the first adapter 25, or the protruding portion 272 may be injection molded to the first adapter 25. Alternatively, the fixing member 27 may be a metal member, and the protruding portion 272 is riveted with the first adapter member 25, so that the fixing member 27 is connected with the first adapter member 25, and the second connecting section 262 has better overcurrent capability with the first adapter member 25.

In the above-mentioned scheme, the first end 272a is located at one side of the first adaptor 25 facing away from the body 271 after passing through the first through hole 251, and the limiting protrusion 273 is formed at the first end 272a and abuts against the first adaptor 25, so that the body 271 and the first adaptor 25 can clamp the second connection section 262, and has a better protection effect on the connection portion 30.

In some embodiments, the body 271 may be located on a side of the first adapter 25 facing away from the second connecting section 262, the first adapter 25 is provided with a first through hole 251, the second connecting section 262 is provided with a second through hole 2621, the first end 272a of the protruding portion 272 is formed with a limiting protrusion 273, the protruding portion 272 is disposed through the first through hole 251 and the second through hole 2621, and the limiting protrusion 273 abuts against the second connecting section 262.

According to some embodiments of the present application, the protrusion 272 is integrally formed with the body 271.

The protrusion 272 and the body 271 may be integrally formed, for example, the protrusion 272 and the body 271 may be mechanically formed, for example, the protrusion 272 and the body 271 may be formed by a metal piece through a process such as turning or grinding, or the protrusion 272 and the body 271 may be injection molded, for example, a hot melt plastic may be cooled by an injection mold to form the protrusion 272 and the body 271.

In the above scheme, the protruding portion 272 and the body 271 are integrally formed, so that the protruding portion 272 and the body 271 are firmly connected.

Referring to fig. 3, 5 and 6, according to some embodiments of the present application, the first adapter 25 includes a main body 252 and two first connection regions 253 for connecting with the electrode assembly 22, the second connection section 262 is connected to the main body 252, the second connection section 262 is located between the two first connection regions 253, and the fixing member 27 is located between the two first connection regions 253.

The first connection region 253 is a region of the first adapter 25 for connection with the electrode assembly 22, and the first connection region 253 is connected with the main body 252.

The second connection section 262 may be connected to the second connection region of the main body 252 to form the connection part 30.

The two first connection regions 253 are disposed at intervals, and the two first connection regions 253 may be located at both sides of the main body 252.

The second connection section 262 is positioned between the two first connection regions 253, and the fixing member 27 is positioned between the two first connection regions 253 to avoid interference with the connection of the first adapter 25 and the electrode assembly 22.

In some embodiments, the electrode assembly 22 may be a rolled configuration.

In some embodiments, the first connection region 253 may have a V-shape, and the V-shape is directed toward the center of the first adapter 25, and the two first connection regions 253 may be disposed opposite each other such that the first connection member is connected with both inner and outer ring pole pieces of the wound structure of the electrode assembly 22.

In the above-described scheme, the second connection section 262 is positioned between the two first connection regions 253, and the assembly space is reasonably allocated, so that the connection stress of the first adapter 25 and the electrode assembly 22 is balanced, and the first adapter 25 and the second connection section 262 are stably connected.

According to some embodiments of the present application, the shape of the body 271 may be triangular, T-shaped, or "mountain" shaped, and the shape of the body 271 is not limited in this application.

Alternatively, the body 271 may have a triangular shape, and the body 271 may have a larger area between the two first connection regions 253 such that the body 271 has a larger contact area with the second connection section 262.

Referring to fig. 3 and 4, according to some embodiments of the present application, a body 271 is located on a side of the first adapter 25 facing away from the electrode assembly 22.

The body 271 is located at a side of the first adapter 25 facing away from the electrode assembly 22, the second connection section 262 is located at a side of the first adapter 25 facing away from the electrode assembly 22, and the second connection section 262 may be located between the first adapter 25 and the body 271.

In the above-described aspects, the body 271 is positioned at the side of the first adapter 25 facing away from the electrode assembly 22, so that the risk of interference between the fixing member 27 and the electrode assembly 22 after the assembly of the first adapter 25 can be reduced, thereby facilitating the connection of the first adapter 25 and the electrode assembly 22.

Referring to fig. 3, 4 and 8, according to some embodiments of the present application, the first connection region 253 protrudes from a side of the main body 252 facing the electrode assembly 22, and the protruding portion 272 protrudes from a side of the main body 252 facing the electrode assembly 22 and does not exceed the first connection region 253.

The main body 252 has a second surface 252a facing the electrode assembly 22 and a third surface 252b facing away from the electrode assembly 22, the second surface 252a and the third surface 252b being disposed opposite to each other in the thickness direction Z of the first adapter 25.

The first connection region 253 protrudes from a side of the main body 252 facing the electrode assembly 22, that is, the first connection region 253 protrudes from the second surface 252a. The corresponding region of the first connection region 253 on the third surface 252b may form a groove, that is, the first connection region 253 may be concavely formed from the third surface 252b toward the second surface 252a such that the first connection region 253 protrudes from the second surface 252a. The first connection region 253 is closer to the electrode assembly 22 than the main body 252 so that the first connection region 253 is connected with the electrode assembly 22.

The protruding portion 272 protrudes from a side of the main body 252 facing the electrode assembly 22, that is, the protruding portion 272 protrudes from the second surface 252a.

The protruding portion 272 does not exceed the first connecting region 253, for example, the protruding portion 272 protrudes from the second surface 252a by a height H1, and the protruding portion 253 protrudes from the second surface 252a by a height H2, which is satisfied by H1 < H2.

In the above-described aspect, the end of the protruding portion 272 remote from the body 271 is located at the side of the main body 252 facing the electrode assembly 22, and the protruding portion 272 protrudes from the main body 252 to a height lower than that of the first connection region 253 protruding from the main body 252, so that the assembly height can be reduced, the space occupation of the structure of the fixing member 27 assembled with the first adapter member 25 can be reduced, and the first connection region 253 can be connected with the electrode assembly 22.

According to some embodiments of the present application, the material of the fixing member 27 is the same as that of the second adaptor 26.

The material of the fixing member 27 may be the same as that of the second adaptor 26, for example, the material of the fixing member 27 is a conductive material, such as copper, iron or alloy.

In the above-mentioned scheme, the material of the fixing element 27 is the same as that of the second adaptor 26, and the fixing element 27 fixes the second connecting section 262 to the first adaptor 25, so that the first adaptor 25 and the second adaptor 26 have better overcurrent capability.

Referring to fig. 8, according to some embodiments of the present application, the second interposer 26 is a multi-layer structure and includes a plurality of conductive sheets 264 stacked together.

The second interposer 26 has a multilayer structure, and the second interposer 26 includes a plurality of conductive sheets 264 stacked one on another, and the plurality of conductive sheets 264 are stacked one on another in the thickness direction. The conductive sheet 264 may be a metal sheet (e.g., a copper sheet, an aluminum sheet, or other conductive metal sheet) having good electrical conductivity to facilitate the removal of electrical energy from the electrode assembly 22. The conductive sheet 264 may also be a non-metallic conductive sheet 264, such as a graphite sheet, a conductive ceramic sheet.

Optionally, the conductive sheet 264 is a metal sheet.

The thickness of each layer of conductive sheets 264 in the multi-layer conductive sheets 264 may be equal.

In the above-mentioned scheme, the second adaptor 26 has a multi-layer structure, so that the second adaptor 26 is bent conveniently.

According to some embodiments of the present application, the strength of the fixture 27 is greater than the strength of the single-layer conductive sheet 264.

The intensity of mounting 27 is greater than the intensity of individual layer conducting strip 264, and the connection reliability that is convenient for make second adaptor 26 and first adaptor 25 is higher, and simultaneously, the intensity of individual layer conducting strip 264 is lower, can reduce the degree of difficulty that second adaptor 26 was bent for first adaptor 25.

Referring to fig. 4, according to some embodiments of the present application, the second adapter 26 further includes a third connecting section 263, the third connecting section 263 connects the first connecting section 261 and the second connecting section 262, the third connecting section 263 is bent relative to the second connecting section 262, the first connecting section 261 is bent relative to the third connecting section 263, and the first connecting section 261 and the second connecting section 262 are located at two sides of the third connecting section 263 in the thickness direction.

The thickness direction of the third connection section 263 may be parallel to the thickness direction Z of the first adapter 25.

When the second adapter 26 is unfolded, the first connection section 261, the third connection section 263 and the second connection section 262 may be sequentially distributed along the length direction of the second adapter 26. The first connecting section 261, the third connecting section 263 and the second connecting section 262 are integrally formed.

Referring to fig. 4 and 6, a first bending region 26a is disposed between the first connecting section 261 and the third connecting section 263, a second bending region 26b is disposed between the third connecting section 263 and the second connecting section 262, and the second adaptor 26 is bent to form an S shape. That is, the first connecting section 261 forms a first bending region 26a after being bent around the first bending axis F1 relative to the third connecting section 263, and the second connecting section 262 forms a second bending region 26b after being bent around the second bending axis F2 relative to the third connecting section 263. The second adaptor 26 has a first face (not shown) and a second face (not shown) opposite to each other in the thickness direction thereof, the second adaptor 26 has an S-shaped bent form, the first face is located at the inner ring of the first bending region 26a at the first bending region 26a, the second face is located at the outer ring of the first bending region 26a, the bending radius of the conductive sheet 264 near the first face is smaller, and the bending radius of the conductive sheet 264 near the second face is larger; at the second bending region 26b, the first surface is located at the outer ring of the second bending region 26b, the second surface is located at the inner ring of the second bending region 26b, the bending radius of the conductive sheet 264 near the first surface is larger, and the bending radius of the conductive sheet 264 near the second surface is smaller. After the second adaptor 26 is bent twice, the bending amounts of the conductive sheets 264 of each layer are the same, that is, the edges of the two ends of the conductive sheets 264 of each layer in the length direction are flush.

In the above-mentioned scheme, the second adaptor 26 can be S-shaped bending for the extension of bending of each layer of conducting strip 264 is the same, namely, each layer of conducting strip 264' S both ends edge flushes, and then makes each layer of conducting strip 264 atress of second adaptor 26 even on the one hand, difficult emergence fracture, on the other hand control the height after the second adaptor 26 is bent, make battery monomer 20 have higher energy density, avoid multilayer structure to the layering phenomenon appears, and the inlayer appears the fold easily, and then leads to bending the back high increase, occupy installation space and the problem of the assembly of battery monomer 20 of being inconvenient for.

According to some embodiments of the present application, the first adapter 25 is of a single layer structure.

The first transfer member 25 has a single-layer structure, so that the connection reliability of the first transfer member 25 and the electrode assembly 22 is high.

According to some embodiments of the present application, there is provided a battery 100 including the battery cell 20 provided in any of the embodiments described above.

According to some embodiments of the present application, an electrical device is provided, where the electrical device includes the battery cell 20 provided in any one of the embodiments, and the battery cell 20 is used to provide electrical energy.

The powered device is any of the systems or devices described above that employ the battery cells 20.

The strength referred to herein is tensile strength and may be measured by a tensile test method (e.g. GB/T228.1-2010 method for tensile test of metallic materials).

Referring to fig. 3 to 8, a battery cell 20 is provided in the embodiment of the present application, the battery cell 20 has a cylindrical shape, and the battery cell 20 includes a housing 21, an electrode assembly 22, an electrode terminal 23, an insulating member 24, a first adapter 25, a second adapter 26, and a fixing member 27.

The housing 21 includes a case 211 and an end cap 212, the case 211 having an opening, the end cap 212 closing the opening. The insulator 24 is disposed on the side of the end cap 212 facing the interior of the battery cell 20.

The electrode terminal 23 is disposed at the end cap 212, and the electrode assembly 22 is disposed in the case 211.

The first and second transfer members 25 and 26 are disposed in the case 211, the second transfer member 26 is disposed at a side of the first transfer member 25 facing away from the electrode assembly 22, the first transfer member 25 is electrically connected with the electrode assembly 22, and the second transfer member 26 connects the first transfer member 25 and the electrode terminal 23. The first adaptor 25 has a single-layer structure, and the second adaptor 26 has a multi-layer structure and includes a plurality of conductive sheets 264 stacked.

The second adaptor 26 includes a first connecting section 261, a third connecting section 263 and a second connecting section 262 sequentially connected, the second connecting section 262 is connected to the electrode assembly 22, the first connecting section 261 is connected to the electrode terminal 23, the insulating member 24 is disposed between the first connecting section 261 and the end cap 212, and the insulating member 24 is used for insulating and isolating the first connecting section 261 and the end cap 212.

The first connecting section 261 is bent relative to the third connecting section 263 to form a first bending region 26a, the second connecting section 262 is bent relative to the third connecting section 263 to form a second bending region 26b, the second adapter 26 is S-shaped, and the first connecting section 261 and the second connecting section 262 are respectively located at two sides of the third connecting section 263 in the thickness direction.

The second connecting section 262 is welded with the first adapter 25 to form the connection 30. The fixing member 27 includes a body 271 and a protrusion 272, and the second connecting section 262 is located between the body 271 and the first adapter 25 along a thickness direction Z of the first adapter 25, and the protrusion 272 is disposed on a side of the body 271 facing the first adapter 25 and protrudes from the body 271. Along the thickness direction Z of the first adapter 25, the projection of the body 271 on the first adapter 25 covers the connection portion 30. The first adapter 25 is provided with a first through hole 251 corresponding to the protruding portion 272, and a portion of the protruding portion 272 is inserted into the first through hole 251. The protruding portion 272 has a first end 272a far away from the body 271, the first end 272a is formed with a limiting protrusion 273, the limiting protrusion 273 is located on one side of the first adaptor 25 far away from the body 271, the limiting protrusion 273 is abutted with the first adaptor 25, and the protruding portion 272 is riveted with the first adaptor 25, so that the body 271 and the first adaptor 25 clamp the second adaptor 26.

While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (17)

1. A battery cell, comprising:

a first adapter for connecting the electrode assembly;

the second adapter comprises a first connecting section and a second connecting section, the first connecting section is used for connecting an electrode terminal, and the second connecting section is connected with the first adapter;

a securing member configured to secure the second connection section to the first adapter member.

2. The battery cell according to claim 1, wherein the fixing member includes a body and a protruding portion, the second connection section is located between the body and the first adapter member in a thickness direction of the first adapter member, the protruding portion is provided at a side of the body facing the first adapter member and protrudes from the body, the first adapter member is provided with a first through hole corresponding to the protruding portion, and a portion of the protruding portion is inserted into the first through hole so that the body and the first adapter member clamp the second connection section.

3. The battery cell of claim 2, wherein the second connection section is connected to the first adapter member to form a connection portion, and wherein a projection of the body onto the first adapter member in a thickness direction of the first adapter member at least partially overlaps the connection portion.

4. The battery cell as recited in claim 3, wherein a projection of the body onto the first adapter member covers the connection portion in a thickness direction of the first adapter member.

5. The battery cell according to claim 2, wherein the second connection section is provided with a second through hole corresponding to the protruding portion, and the protruding portion is inserted into the second through hole and the first through hole.

6. The battery cell of claim 2 or 5, wherein the projection has a first end remote from the body, the first end being located on a side of the first adapter facing away from the body, the first end being formed with a limit projection that abuts the first adapter.

7. The battery cell of claim 2, wherein the projection is integrally formed with the body.

8. The battery cell of claim 2, wherein the first adapter member includes a main body and two first connection regions for connection with the electrode assembly, the second connection section is connected to the main body, the second connection section is located between the two first connection regions, and the fixing member is located between the two first connection regions.

9. The battery cell of claim 8, wherein the body is located on a side of the first adapter facing away from the electrode assembly.

10. The battery cell of claim 9, wherein the first connection region protrudes from a side of the body facing the electrode assembly, and the protrusion protrudes from a side of the body facing the electrode assembly and does not exceed the first connection region.

11. The battery cell of claim 1, wherein the securing member is the same material as the second adapter member.

12. The battery cell of claim 1, wherein the second adapter is a multi-layer structure and includes a plurality of layers of conductive sheets arranged in a stack.

13. The battery cell of claim 12, wherein the fastener has a strength greater than a strength of a single layer of the conductive sheet.

14. The battery cell of claim 12, wherein the second adapter further comprises a third connecting section connecting the first and second connecting sections, the third connecting section being bent with respect to the second connecting section, the first connecting section being bent with respect to the third connecting section, the first and second connecting sections being located on both sides of the third connecting section in a thickness direction.

15. The battery cell of claim 1, wherein the first adapter is of a single layer construction.

16. A battery comprising a cell according to any one of claims 1-15.

17. A powered device comprising a battery cell as claimed in any one of claims 1-15.

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