CN216872123U

CN216872123U - Cover plate assembly, battery monomer, battery and electric equipment

Info

Publication number: CN216872123U
Application number: CN202220351523.0U
Authority: CN
Inventors: 肖俊; 伍林山; 孙彩影
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2022-07-01
Anticipated expiration: 2032-02-21
Also published as: WO2023155658A1

Abstract

The embodiment of the application discloses a cover plate assembly, a battery monomer, a battery and electric equipment. The first surface of the cover plate assembly is provided with a temperature collection area, the temperature collection area is provided with a groove or a plurality of first protruding structures, the first surface is the surface of the cover plate assembly facing the outside of the battery cell, the first protruding structures protrude from the first surface to the outside of the battery cell, the opening of the groove faces the outside of the battery cell, the temperature collection area is used for being provided with a temperature collection device, and the temperature collection device is used for collecting the temperature of the battery cell. The cover plate assembly, the single battery, the battery and the electric equipment can improve the structural strength of the battery.

Description

Cover plate assembly, battery monomer, battery and electric equipment

Technical Field

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

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry. Under such circumstances, electric vehicles are an important component of sustainable development of the automobile industry due to their energy saving and environmental protection advantages. In the case of electric vehicles, battery technology is an important factor in the development thereof.

In addition to improving the performance of batteries, safety issues are also a considerable problem in the development of battery technology. Considering that the temperature changes greatly during the use of the battery, a temperature acquisition device is usually required to acquire the temperature of the battery cells in the battery. How to set up temperature acquisition device so as to guarantee can accurately conveniently gather the free temperature of battery is the problem that awaits solution at present.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a cover plate assembly, a battery monomer, a battery and electric equipment, and the stability of the temperature control performance of the battery can be improved.

In a first aspect, a temperature collection area is arranged on a first surface of the cover plate assembly, a groove or a plurality of first protruding structures are arranged in the temperature collection area, wherein the first surface of the cover plate assembly faces the outside of the battery cell, the first protruding structures protrude from the first surface to the outside of the battery cell, an opening of the groove faces the outside of the battery cell, the temperature collection area is used for arranging a temperature collection device, and the temperature collection device is used for collecting the temperature of the battery cell.

Therefore, the cover plate assembly of the embodiment of the application is provided with the temperature acquisition device through the temperature acquisition area, and the temperature acquisition device is used for acquiring the temperature of the battery monomer so as to analyze, process and judge the subsequent temperature. In whole temperature acquisition process, the heat transfer route is short, temperature response speed is fast, and because the temperature of apron subassembly is more unanimous with the temperature of the free inside of battery, so set up temperature acquisition district on the apron subassembly, greatly reduced the deviation between temperature acquisition device's the collection temperature and the free inside actual temperature of battery, thereby improved the accuracy of temperature sampling, the temperature of guaranteeing temperature acquisition device collection can in time reflect the change and the height of the free inside temperature of battery, effectively reduce, even avoid the battery wrong report and the emergence of the power limiting condition in advance.

In addition, because the temperature acquisition region of the embodiment of the application can be provided with the groove, the temperature acquisition device can be at least partially positioned in the groove, so that the position of the temperature acquisition device is limited, the temperature acquisition device is prevented from shifting or falling relative to the cover plate assembly, and the stability of the temperature acquisition device is ensured; or, the temperature acquisition area can be provided with a first protruding structure, so that the interaction force between the first surface and the temperature acquisition device is greatly increased, the possibility that the temperature acquisition device shifts or falls off relative to the cover plate assembly is reduced, and the stability of the temperature acquisition device can be ensured. Therefore, no matter the groove or the first protruding structure is arranged, the temperature acquisition area can be relatively fixed between the temperature acquisition device and the temperature acquisition area under the condition that parts are not additionally added, and compared with the mode of using an additional pressing piece to fix the temperature acquisition device, the temperature acquisition area can effectively reduce the cost of the battery and improve the processing efficiency of the battery under the condition of improving the temperature acquisition precision.

In some embodiments, the plurality of first raised structures are the same shape and size to facilitate processing.

In some embodiments, the plurality of first protrusion structures includes a plurality of first protrusion structure columns, each of the plurality of first protrusion structure columns includes at least two first protrusion structures arranged along a first direction, so as to further improve the processing efficiency, where a direction in which the plurality of first protrusion structures are arranged along a single direction is the first direction, and the plurality of first protrusion structure columns are arranged perpendicular to the first direction.

In some embodiments, the first raised structure is a cone, the axis of which is perpendicular to the first surface, which both facilitates processing and increases the contact area between the temperature acquisition region and the temperature acquisition device to improve stability therebetween.

In some embodiments, the bottom wall of the recess is provided with a plurality of second raised structures protruding towards the opening.

Both can pass through the relative slip of recess restriction temperature acquisition device, can also increase the area of contact between the diapire of temperature acquisition device and recess through the protruding structure of second.

In some embodiments, the plurality of second projection structures are the same shape and size to facilitate processing.

In some embodiments, the plurality of second protrusion structures includes a plurality of second protrusion structure columns, each of the plurality of second protrusion structure columns includes at least two second protrusion structures arranged along a second direction, so as to further improve the processing efficiency, where a direction in which the plurality of second protrusion structures are arranged along a single direction is the second direction, and the plurality of second protrusion structure columns are arranged perpendicular to the second direction.

In some embodiments, the height of the second protrusion structure is smaller than the depth of the groove, so that the temperature acquisition device can be at least partially accommodated in the groove, and the temperature acquisition device is prevented from protruding out of the electrode terminal, thereby preventing the temperature acquisition device from affecting the installation of other components in the battery.

In some embodiments, the second projection structure is a cone, and the axis of the cone is perpendicular to the first surface, so that the processing is convenient, and the contact area between the temperature acquisition region and the temperature acquisition device can be increased, so as to improve the stability between the temperature acquisition region and the temperature acquisition device.

In some embodiments, the cover plate assembly has a second surface facing the battery cell opposite to the first surface, and an area of the second surface corresponding to the bottom wall is protruded from an area of the second surface not corresponding to the bottom wall. Or the area of the second surface corresponding to the bottom wall is flush with the area of the second surface not corresponding to the bottom wall.

For the condition that the bottom wall is flush with the surrounding area of the bottom wall on the second surface, the thickness of the groove is relatively small, so that the weight of the cover plate assembly can be effectively reduced, and the heat dissipation of the battery monomer through the groove is facilitated; and to the regional condition around the diapire on the diapire protrusion second surface, the thickness of this diapire can keep unanimous with other regions of apron subassembly, has guaranteed the intensity in temperature acquisition district, and simultaneously, this diapire is close to the free inside of battery more for the temperature that the temperature acquisition device gathered is more accurate.

In some embodiments, a surface of the bottom wall facing the outside of the battery cell is rectangular to facilitate processing.

In some embodiments, the cover plate assembly further comprises: two electrode terminals, the temperature acquisition region being located between the two electrode terminals.

Because the region between the electrode terminals and the edge of the first surface is limited, the temperature acquisition region is arranged in the edge region and is not beneficial to installation, and if the temperature acquisition region is close to the edge region, the temperature acquisition device is greatly influenced by the external environment, so that the temperature measurement is inaccurate, the temperature acquisition region can be arranged between the two electrode terminals, the installation is convenient, and the temperature acquisition precision can be ensured.

In a second aspect, a battery cell is provided, including: the cover plate assembly of the first aspect or any embodiment of the first aspect.

In a third aspect, a battery is provided, including: a battery cell comprising the cover plate assembly of the first aspect or any one of the embodiments of the first aspect; the temperature acquisition device is arranged in the temperature acquisition area and is used for acquiring the temperature of the battery monomer.

In some embodiments, the temperature collecting device includes a thermal pad disposed between a surface of the temperature collecting region facing the outside of the battery cell and the temperature sensor, and the temperature sensor is configured to measure the temperature of the battery cell through the thermal pad.

In some embodiments, the thermal pad is provided with a plurality of first raised structures, the surface of the thermal pad facing the thermal pad is provided with a plurality of recessed structures, and each first raised structure of the plurality of first raised structures is received in a corresponding recessed structure to conform the surface of the thermal pad facing the thermal pad to the surface of the thermal pad facing the thermal pad.

In some embodiments, the temperature collection area is provided with the groove, and at least part of the thermal pad is located in the groove, so that the thermal pad cannot slide relative to the first surface under the limitation of the groove, and the stability of the temperature collection device is ensured.

In some embodiments, the bottom wall of the groove is provided with a plurality of second protruding structures protruding towards the opening, the surface of the thermal pad facing the bottom wall is provided with a plurality of recessed structures, and each second protruding structure of the plurality of second protruding structures is accommodated in the corresponding recessed structure, so that the surface of the bottom wall facing the thermal pad is attached to the surface of the thermal pad facing the bottom wall.

In some embodiments, the thermal pad is bonded to the temperature acquisition region by an adhesive.

In a fourth aspect, there is provided an electrical device comprising: a battery as in any one of the embodiments of the third aspect or the third aspect.

In some embodiments, the powered device is a vehicle, a watercraft, or a spacecraft.

Drawings

FIG. 1 is a schematic illustration of a vehicle according to one embodiment of the present application;

FIG. 2 is a schematic diagram of a cell according to one embodiment of the present application;

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

FIG. 4 is a schematic top view of a cover plate assembly according to one embodiment of the present application;

FIG. 5 is a schematic view of an exploded configuration of a temperature collection zone and a temperature collection device according to one embodiment of the present application;

FIG. 6 is a side view of a thermal pad according to one embodiment of the present application;

FIG. 7 is a schematic view of a cover plate assembly provided with a temperature acquisition device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a battery cell according to another embodiment of the present application;

FIG. 9 is a schematic top view of a cover plate assembly according to another embodiment of the present application;

FIG. 10 is an exploded view of a cover plate assembly and a temperature collection device according to another embodiment of the present application;

FIG. 11 is a schematic view of a cover plate assembly provided with a temperature acquisition device according to another embodiment of the present application;

FIG. 12 is a schematic view of an exploded view of a temperature acquisition zone and a temperature acquisition device according to another embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not 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 can be included in at least one embodiment of the specification. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected 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 as appropriate.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).

In the present application, the battery cell may include a primary battery and a secondary battery, and may be, for example, a lithium ion battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are also not limited in the embodiment of the application.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. A battery pack generally includes a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the negative pole mass flow body protrusion in the negative pole mass flow body of coating the negative pole active substance layer not coating the negative pole active substance layer, and the negative pole mass flow body of not coating the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be polypropylene (PP) or Polyethylene (PE). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge and discharge rate, and other performance parameters, and also needs to consider the safety of the battery. For batteries, the main safety hazard comes from the charging and discharging process. During the charging and discharging of the battery, the temperature changes greatly, and the use of the battery is affected by the excessively high or excessively low temperature. Therefore, how to accurately detect the temperature inside the battery cell is an urgent technical problem to be solved in the industry at present.

In the related art, the battery may be warmed in the following manner: the temperature of the bus part is collected through a thermistor arranged on the flexible circuit board, and the temperature of the bus part is used as the temperature inside the battery, wherein the bus part is used for connecting electrode terminals of different battery cells so as to realize the electric connection of the battery cells. However, in practical situations, the temperature on the bus bar is high, the temperature inside the battery cell is low, if the difference between the two temperatures is large, the battery can give a false alarm, and the power is limited in advance, which can affect the normal use of the whole battery.

Therefore, the embodiment of the application provides a cover plate assembly of a battery cell, which can solve the above problems. On a first surface of the cover plate assembly far away from the interior of the battery cell, a temperature collection area is arranged, wherein the temperature collection area is provided with a groove or a plurality of first protruding structures, an opening of the groove faces the exterior of the battery cell, and the first protruding structures protrude from the first surface to the exterior of the battery cell. The temperature acquisition area is used for arranging a temperature acquisition device which is used for acquiring the temperature of the battery monomer so as to analyze, process and judge the subsequent temperature. In whole temperature acquisition process, the heat transfer route is short, temperature response speed is fast, and because the temperature of apron subassembly is more unanimous with the temperature of the free inside of battery, so set up temperature acquisition district on the apron subassembly, greatly reduced the deviation between temperature acquisition device's the collection temperature and the free inside actual temperature of battery, thereby improved the accuracy of temperature sampling, the temperature of guaranteeing temperature acquisition device collection can in time reflect the change and the height of the free inside temperature of battery, effectively reduce, even avoid the battery wrong report and the emergence of the power limiting condition in advance.

In addition, because the temperature acquisition region of the embodiment of the application can be provided with the groove, the temperature acquisition device can be at least partially positioned in the groove, so that the position of the temperature acquisition device is limited, the temperature acquisition device is prevented from shifting or falling relative to the cover plate assembly, and the stability of the temperature acquisition device is ensured; or the temperature acquisition area can be provided with the first bulge structure, so that the interaction force between the first surface and the temperature acquisition device is greatly increased, the possibility that the temperature acquisition device shifts or falls off relative to the cover plate assembly is reduced, and the stability of the temperature acquisition device can be ensured. Therefore, no matter the groove or the first protruding structure is arranged, the temperature acquisition area can be relatively fixed between the temperature acquisition device and the temperature acquisition area under the condition that parts are not additionally added, and compared with the mode that the temperature acquisition device is additionally fixed by the pressing piece, the temperature acquisition area can effectively reduce the cost of the battery and improve the processing efficiency of the battery under the condition that the temperature acquisition precision is improved.

The technical scheme described in the embodiment of the application is suitable for various electric equipment using batteries.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of explanation, the following embodiments will be described by taking an electric device as an example of a vehicle.

For example, as shown in fig. 1, which is a schematic structural diagram of a vehicle 1 according to an embodiment of the present disclosure, the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, the controller 30 being configured to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, for example, the battery 10 may be used as an operation power supply of the vehicle 1 for a circuit system of the vehicle 1, for example, for power demand for operation at the start, navigation, and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operation power source of the vehicle 1 but also as a driving power source of the vehicle 1 instead of or in part of fuel or natural gas to provide driving power to the vehicle 1.

In order to meet different power usage requirements, the battery 10 may include a plurality of battery cells. For example, fig. 2 shows a schematic structural diagram of a battery 10 according to an embodiment of the present application, and the battery 10 may include a plurality of battery cells 20. The plurality of battery cells 20 may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. Battery 10 may also be referred to as a battery pack. Alternatively, as shown in fig. 2, a plurality of battery cells 20 may be connected in series or in parallel or in series-parallel to form a battery module 200, and a plurality of battery modules 200 may be connected in series or in parallel or in series-parallel to form a battery 10. That is, the plurality of battery cells 20 may be directly assembled into the battery 10, or the battery module 200 may be assembled first, and then the battery module 200 may be assembled into the battery 10.

As shown in fig. 2, the battery 10 may further include a case 11, the case 11 has a hollow structure, and the plurality of battery cells 20 are accommodated in the case 11. Fig. 2 shows a possible implementation manner of the box 11 of the embodiment of the present application, and as shown in fig. 2, the box 11 may include two parts, which are referred to as a first part 111 and a second part 112, respectively, and the first part 111 and the second part 112 are buckled together. The shape of the first and second portions 111 and 112 may be determined according to the shape of the battery module 200 in which at least one of the first and second portions 111 and 112 has one opening. For example, as shown in fig. 2, each of the first portion 111 and the second portion 112 may be a hollow rectangular parallelepiped and only one surface of each may be an opening surface, the opening of the first portion 111 and the opening of the second portion 112 are oppositely disposed, and the first portion 111 and the second portion 112 are fastened to each other to form the case 11 having a closed chamber.

For another example, unlike the one shown in fig. 2, only one of the first and second portions 111 and 112 may be a hollow rectangular parallelepiped having an opening, and the other may be plate-shaped to cover the opening. For example, taking the second part 112 as a hollow rectangular parallelepiped with only one surface being an open surface and the first part 111 as a plate, the first part 111 covers the open surface of the second part 112 to form the case 11 with a closed chamber, which can be used to accommodate a plurality of battery cells 20. The plurality of battery cells 20 are connected in parallel or in series-parallel combination and then placed in the case 11 formed by buckling the first part 111 and the second part 112.

Optionally, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member for electrically connecting the plurality of battery cells 20, such as in parallel or in series-parallel. Specifically, the bus member may achieve electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus bar member may be fixed to the electrode terminals of the battery cells 20 by welding. The electric energy of the plurality of battery cells 20 can be further led out through the case 11 by the conductive mechanism.

Fig. 3 shows a schematic diagram of one battery cell 20 of the present embodiment. As shown in fig. 3, the battery cell 20 of the embodiment of the present application may have a polyhedral structure, and the rectangular parallelepiped battery cell 20 is described as an example below. As shown in fig. 3, the battery cell 20 includes a cap plate assembly 21 and a case 22.

The case 22 may have a hollow structure with at least one open end for accommodating the electrode assembly, wherein one or more electrode assemblies may be disposed in the case 22 according to actual use requirements. If the housing 22 is a hollow structure with an opening formed at one end, the cover plate assembly 21 may be a plate-shaped structure so as to cover the opening of the housing 22; if the housing 22 is a hollow structure with two opposite ends forming an opening, the cover plate assembly 21 may include two plate-shaped cover plates for respectively covering the openings of the two ends of the housing 22. The material of the housing 22 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The housing 22 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like. Illustratively, in the embodiment of the present application, as shown in fig. 3, the case 22 is a rectangular parallelepiped structure, and the case 22 is a hollow structure with an opening formed at one end.

The cap plate assembly 21 is a member that covers an opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the cover plate assembly 21 may be adapted to the shape of the housing 22, as shown in fig. 3, the housing 22 is a rectangular parallelepiped structure, and the cover plate assembly 21 may be a rectangular plate structure adapted to the housing 22. The cover member 21 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc., and the material of the cover member 21 may be the same as or different from that of the housing 22.

Fig. 4 shows a schematic top view of a cover plate assembly 21 according to an embodiment of the present application. As shown in fig. 3 and 4, the first surface 21a of the cover plate assembly 21 is provided with a temperature collection region 211, the temperature collection region 211 is provided with a groove or a plurality of first protrusion structures 2111, wherein the first surface 21a is the surface of the cover plate assembly 21 facing the outside of the battery cell 20, the first protrusion structures 2111 protrude from the first surface 21a to the outside of the battery cell 20, the opening of the groove faces the outside of the battery cell 20, and the temperature collection region 211 is used for providing a temperature collection device (not shown in fig. 3 and 4) for collecting the temperature of the battery cell 20.

It should be understood that the temperature acquisition region 211 in fig. 3 and 4 is exemplified by being provided with the plurality of first protrusion structures 2111, and the case where the temperature acquisition region 211 is provided with the grooves is not illustrated, but the embodiment of the present application is not limited thereto.

Therefore, in the embodiment of the present application, on the first surface 21a of the cover plate assembly 21 of the battery cell 20 away from the inside of the battery cell 20, a temperature collection region 211 is disposed, and the temperature collection region 211 may be used to provide a temperature collection device for collecting the temperature of the battery cell 20 so as to perform subsequent temperature analysis, processing and judgment. In the whole temperature collection process, the heat transfer path is short, the temperature response speed is high, and because the temperature of the cover plate assembly 21 is more consistent with the temperature of the inside of the battery cell 20, so the temperature collection area 211 is arranged on the cover plate assembly 21, the deviation between the collection temperature of the temperature collection device and the actual temperature of the inside of the battery cell 20 is greatly reduced, the accuracy of temperature sampling is improved, the temperature collected by the temperature collection device can timely reflect the change and the height of the temperature of the inside of the battery cell 20, the occurrence of the condition of power limitation in advance is effectively reduced, even the false alarm of the battery 10 is avoided.

In addition, since the temperature collection region 211 of the embodiment of the present application may be provided with a groove, the temperature collection device may be at least partially located in the groove, thereby limiting the position of the temperature collection device, preventing the temperature collection device from shifting or falling off relative to the cover plate assembly 21, and ensuring the stability of the temperature collection device; alternatively, the temperature collection region 211 may be provided with the first protrusion structure 2111, which greatly increases the interaction force between the first surface 21a and the temperature collection device, reduces the possibility of displacement or falling off of the temperature collection device relative to the cover plate assembly 21, and also ensures the stability of the temperature collection device. Therefore, no matter the groove or the first protrusion 2111 is provided, the temperature collection region 211 can realize relative fixation between the temperature collection device and the temperature collection region 211 without additionally adding components, and compared with a mode of fixing the temperature collection device by using an additional pressing member, the temperature collection region 211 of the embodiment of the present application can effectively reduce the cost of the battery 10 and improve the processing efficiency of the battery 10 under the condition of improving the temperature collection precision.

The temperature acquisition region 211 of the present application will be described with reference to fig. 3 and 4 as an example. Alternatively, the shape and size of the area occupied by the temperature acquisition region 211 on the first surface 21a according to the embodiment of the present application may be set according to practical applications. For example, the size of the area of the first surface 21a occupied by the temperature acquisition region 211 may be set according to the size of the temperature acquisition device, so as to set the temperature acquisition device; the shape of the area of the first surface 21a occupied by the temperature acquisition region 211 can be circular or rectangular for easy processing, and the embodiment of the present application is not limited thereto.

Alternatively, the temperature acquisition region 211 of the present embodiment may be disposed at any position of the first surface 21a to avoid interference with other components of the cover plate assembly 21. For example, as shown in fig. 3 and 4, the cover plate assembly 21 further includes: two

electrode terminals

212a and 212b, the temperature acquisition region 211 may be located between the two

electrode terminals

212a and 212b, i.e., the temperature acquisition region 211 may be located at any one region between the two

electrode terminals

212a and 212 b. Since the area between the

electrode terminals

212a and 212b and the edge of the first surface 21a is limited, the temperature collection region 211 is disposed at the edge area, which is not favorable for installation, and if the temperature collection region 211 is close to the edge area, the installed temperature collection device is greatly affected by the external environment, which further causes inaccurate temperature measurement, so that the temperature collection region 211 can be disposed between the two

electrode terminals

212a and 212b, which is convenient for installation and can ensure the accuracy of temperature collection.

Specifically, the cap plate assembly 21 may be provided thereon with

electrode terminals

212a and 212b, and the electrode terminal 214 is used to be electrically connected with an electrode assembly inside the battery cell 20 to output electric power of the battery cell 20. The electrode terminals may include a positive electrode terminal 212a for electrical connection with a positive tab included in the electrode assembly and a negative electrode terminal 212b for electrical connection with a negative tab of the electrode assembly. The positive electrode terminal 212a and the positive electrode tab may be directly connected or indirectly connected, and the negative electrode terminal 212b and the negative electrode tab may be directly connected or indirectly connected. For example, the positive electrode terminal 212a may be electrically connected to the positive tab through a connecting member, and the negative electrode terminal 212b may be electrically connected to the negative tab through a connecting member.

The electrode assembly is a part in which electrochemical reactions occur in the battery cell 20. The electrode assembly may be a cylinder, a rectangular parallelepiped, or the like. The electrode assembly may include a tab, which may include a positive electrode tab formed by laminating a portion of the positive electrode tab, on which the positive electrode active material layer is not coated, and a negative electrode tab formed by laminating a portion of the negative electrode tab, on which the negative electrode active material layer is not coated, and a body portion formed by laminating or winding a portion of the positive electrode tab, on which the positive electrode active material layer is coated, and a portion of the negative electrode tab, on which the negative electrode active material layer is coated.

It should be understood that in the battery cell 20, since the positive electrode terminal 212a has a higher potential than the negative electrode terminal 212a, the negative electrode terminal 212b needs to be made of a material having a higher melting point than the material of the positive electrode terminal 212a in order to prevent the electrolyte from electrochemically corroding the negative electrode terminal 212 b. For example, the material of the positive electrode terminal 212a may be aluminum, and the material of the negative electrode terminal 212b may be copper.

Since the melting point of the material of the positive electrode terminal 212a is lower than that of the material of the negative electrode terminal 212b, the temperature of the positive electrode terminal 212a rises quickly and generates much heat under the same current, which also results in a higher temperature of the positive electrode terminal 212a and its vicinity and a larger temperature difference with the inside of the battery cell 20; on the contrary, the temperature near the negative electrode terminal 212b is closer to the temperature inside the battery cell 20, and therefore, as shown in fig. 3 and 4, the temperature acquisition region 211 may be disposed at the region near the negative electrode terminal 212b, so that the temperature acquisition device can acquire the temperature closer to the inside of the battery cell 20, but the embodiment of the present application is not limited thereto.

Optionally, the cover plate assembly 21 further comprises: a pressure relief mechanism 213, the pressure relief mechanism 213 being located between the two

electrode terminals

212a and 212b, the pressure relief mechanism 213 being configured to be actuated when the pressure or temperature inside the battery cell 20 reaches a threshold value, so as to relieve the pressure inside the battery cell 20. The temperature-sensing region 211 should be kept free from the pressure-releasing mechanism 213 to avoid affecting the pressure-releasing mechanism 213. For example, the temperature collecting region 211 is located between the negative electrode terminal 212b and the pressure relief mechanism 213, that is, the temperature collecting region 211 can be disposed in any region between the negative electrode terminal 212b and the pressure relief mechanism 213, so that the temperature collecting device can obtain the temperature closer to the inside of the battery cell 20 through the temperature collecting region 211 without affecting the pressure relief mechanism 213.

It should be appreciated that in order to improve the safety of the battery 10, a pressure relief mechanism 213 is typically provided for the battery cell 20. The pressure relief mechanism 213 refers to an element or a component that is actuated to relieve the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a predetermined threshold. The predetermined threshold may be adjusted according to design requirements. The predetermined threshold may depend on the material of one or more of the positive electrode tab, the negative electrode tab, the electrolyte and the separator in the battery cell 20. The pressure relief mechanism 213 may be implemented by, for example, a pressure-sensitive or temperature-sensitive element or component, i.e., when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 213 is actuated to form a channel through which the internal pressure or temperature can be relieved. For example, the pressure relief structure 213 may be provided with a notch groove, and when the pressure or temperature inside the battery cell 20 reaches a threshold value, the pressure relief structure 213 is broken along the notch groove, thereby releasing the internal pressure. For another example, the pressure relief mechanism 213 may adopt a temperature-sensitive structure, and when the temperature inside the battery cell 20 reaches a threshold value, the pressure relief mechanism 213 is melted, thereby releasing the internal pressure.

The "actuation" referred to in this application means that the pressure relief mechanism 213 acts so that the internal pressure and temperature of the battery cell 20 are relieved. The actions generated by the pressure relief mechanism 213 may include, but are not limited to: at least a portion of the pressure relief mechanism 213 is broken, torn, melted, or the like. After the pressure relief mechanism 213 is activated, the high-temperature and high-pressure substances inside the battery cell 20 are discharged as an exhaust from the pressure relief mechanism 213. In this way, the battery cell 20 can be vented under controlled pressure or temperature, thereby avoiding potentially more serious accidents.

Emissions from the battery cell 20 as referred to in this application include, but are not limited to: electrolyte, dissolved or split anode and cathode pole pieces, fragments of a separation film, high-temperature and high-pressure gas generated by reaction, flame and the like.

The pressure relief mechanism 213 on the battery cell 20 has an important influence on the safety of the battery. For example, when the battery cell 20 is short-circuited or overcharged, thermal runaway may occur inside the battery cell 20, and the pressure or temperature may suddenly rise. In this case, the internal pressure and temperature can be released outward by the actuation of the pressure release mechanism 213, so as to prevent the explosion and the fire of the battery cell 20.

It should be understood that the cover assembly 21 of the present embodiment may also include other components, and the various components included in the cover assembly 21 and the temperature acquisition region 211 are appropriately positioned to avoid interference. For example, the cover plate assembly 21 may further include a liquid injection hole 214, through which the electrolyte is injected into the battery cell 20, the position of the liquid injection hole 214 being different from the position of the temperature collection area 211 to avoid interference. For another example, the cover assembly 21 may include a cover patch, and the cover patch may serve as an outer surface of the cover assembly 21 to protect the cover assembly 21, wherein the cover patch may include a through hole to avoid the temperature collection region 211, so as to avoid affecting a temperature collection device disposed in the temperature collection region 211.

Specific implementations of the temperature acquisition region 211 and the corresponding temperature acquisition device according to the embodiments of the present application will be described below with reference to the accompanying drawings.

Optionally, as an embodiment, the temperature acquisition region 211 of embodiments of the present application may comprise a plurality of first protrusion structures 2111. FIG. 5 shows an exploded view of the temperature acquisition zone 211 and the temperature acquisition device 12 of an embodiment of the present application. Taking fig. 5 as an example, the temperature collecting device 12 of the embodiment of the present application includes a thermal pad 121 and a temperature sensor 122, the thermal pad 121 is disposed between a surface of the temperature collecting region 211 facing the outside of the battery cell 20 and the temperature sensor 122, and the temperature sensor 122 is used for measuring the temperature of the battery cell 20 through the thermal pad 121.

Alternatively, the temperature sensor 122 of the embodiment of the present application may be implemented in various ways. For example, the temperature sensor 122 may be a Negative Temperature Coefficient (NTC) temperature sensor. Specifically, the temperature sensor 122 may be a water drop head type NTC temperature sensor. The water drop type NTC temperature sensor comprises a head and a lead connected with the head, wherein the head is in a water drop shape and can be also called as a water drop head or an end part. The head of the water drop type NTC temperature sensor may be in direct contact with the thermal pad 121, or a film structure that hardly affects temperature transmission may be interposed therebetween.

Alternatively, the temperature sensor 122 may also be a patch type NTC temperature sensor, where the patch type NTC temperature sensor includes a head portion and a lead connected to the head portion, and the head portion is substantially in a rectangular parallelepiped structure. The head of the patch type NTC temperature sensor is in direct contact with the thermal pad 121 or in contact through a film structure that hardly affects temperature transfer.

Optionally, the thermal pad 121 of the embodiment of the application may have a higher thermal conductivity and a good compressibility, and by using the thermal pad 121, the heat transfer efficiency is improved, and the thermal pad can also bear the expansion deformation and the extrusion of the battery cell 20 during the charging and discharging processes.

The thermal pad 121 and the temperature collection area 211 of the present embodiment are bonded by an adhesive. The transmission path of the internal temperature of the battery cell 20 includes: the temperature of the cover plate assembly 21 is transferred to the thermal pad 121, and the temperature of the thermal pad 121 is transferred to the temperature sensor 122. The temperature sensor 122 transmits the collected temperature signal to the circuit board of the battery 10 for analysis and processing, thereby realizing the control of the discharge power of the battery 10.

From the above analysis, the temperature sensor 122 collects the temperature at the first surface 21a of the cap plate assembly 21 of the battery cell 20. The temperature of the first surface 21a is consistent with the temperature inside the battery cell 20, and the first surface 21a can reflect the change and the level of the temperature inside the battery cell 20 in time. Moreover, the temperature transmission path is short, and the response speed of temperature acquisition of the temperature sensor 122 is high, so that the control is more accurate when the subsequent processing is performed based on the acquired temperature, and therefore, the occurrence of the condition of limiting the power of the battery 10 in advance can be effectively reduced or even avoided, the efficiency of the battery 10 can be effectively exerted, and the structure and the performance of the battery 10 are effectively optimized.

As shown in fig. 5, in case that the temperature acquisition region 211 is provided with a plurality of first raised structures 2111, the surface of the thermal pad 121 facing the temperature acquisition region 211 is provided with a plurality of recessed structures 1211, and each first raised structure 2111 of the plurality of first raised structures 2111 is received in a corresponding recessed structure 1211, so that the surface of the temperature acquisition region 211 facing the thermal pad 121 is conformed to the surface of the thermal pad 121 facing the temperature acquisition region 211. Fig. 6 shows a schematic side view of the thermal pad 121 according to an embodiment of the present application, and fig. 7 shows a schematic view of disposing the temperature acquisition device 12 on the temperature acquisition region 211, as shown in fig. 5 to 7, a plurality of recessed structures 1211 are correspondingly disposed on a surface of the thermal pad 121 facing the temperature acquisition region 211, such that each first raised structure 2111 in the plurality of first raised structures 2111 is correspondingly received in the recessed structure 1211, and further, the temperature acquisition region 211 and the thermal pad 121 are attached to each other, so as to increase a contact area therebetween, and the thermal pad 121 is further stabilized. Specifically, during the use of the battery 10, since the temperature sensor 122 connected to the thermal pad 121 and the circuit board can be connected by a circuit, the thermal pad 121 may be subjected to a pulling force of the circuit, and the plurality of first raised structures 2111 and the corresponding plurality of recessed structures 1211 are provided, so that the thermal pad 121 can be prevented from slipping or even falling off from the temperature acquisition region 211 under the pulling action of the circuit, and even in the case that the adhesive between the thermal pad 121 and the temperature acquisition region 211 is aged, the possibility of slipping or even falling off between the thermal pad 121 and the temperature acquisition region 211 can be reduced.

As shown in fig. 5 to 7, the shapes of the plurality of first protruding structures 2111 may be the same or different, the sizes of the plurality of first protruding structures 2111 may be the same or different, and the plurality of recessed structures 1211 are disposed corresponding to the plurality of first protruding structures 2111. For example, the plurality of first raised structures 2111 may be randomly arranged to facilitate processing of the temperature acquisition region 211 and also to facilitate increasing the contact area between the temperature acquisition region 211 and the thermal pad 121. However, when the plurality of first raised structures 2111 are randomly arranged, the plurality of recessed structures 1211 need to be arranged corresponding to the plurality of first raised structures 2111, which increases the difficulty in processing the thermal pad 121.

For another example, as shown in fig. 5 to 7, the plurality of first raised structures 2111 may be configured to have the same shape and the same size, and correspondingly, the plurality of recessed structures 1211 may be formed and the same size, such that the plurality of first raised structures 2111 and the plurality of recessed structures 1211 cooperate with each other to facilitate the processing and mounting of the thermal pad 121 and the temperature acquisition region 211.

As shown in fig. 5 to 7, a plurality of identical first protrusion structures 2111 may be arranged according to a certain rule, further improving the processing efficiency. Specifically, the plurality of first protrusion structures 2111 includes a plurality of first protrusion structure columns arranged along the direction X, each of which includes at least two first protrusion structures 2111 arranged along the direction Y, the direction X being perpendicular to the direction Y. Correspondingly, the thermal pad 121 includes a plurality of concave structure columns arranged along the direction X, and each of the plurality of concave structure columns includes at least two concave structures 1211 arranged along the direction Y, so that the plurality of first convex structures 2111 and the plurality of concave structures 1211 are matched with each other.

Alternatively, the first protrusion structure 2111 of the embodiment of the present application may be provided in any shape according to the actual application. For example, the first raised structures 2111 are cones having axes perpendicular to the first surface 21a, which both facilitate processing and improve stability between the thermal pad 121 and the temperature acquisition region 211.

Optionally, as another embodiment, the temperature acquisition region 211 of the embodiments of the present application may further comprise a groove 2112. Fig. 8 shows a schematic diagram of another battery cell 20 according to the embodiment of the present application, fig. 9 shows a schematic diagram of a top view of another cover plate assembly 21 according to the embodiment of the present application, fig. 10 shows an exploded structural schematic diagram of the cover plate assembly 21 and the temperature collection device 12 according to the embodiment of the present application, and fig. 11 shows a schematic diagram of the cover plate assembly 21 provided with the temperature collection device 12. Unlike the embodiment shown in fig. 3-7, the temperature acquisition region 211 is provided with grooves 2112 instead of the first raised structures 2111, as shown in fig. 8-11. The temperature acquisition region 211 of the cover plate assembly 21 of the embodiment of the present application is provided with the groove 2112, which can reduce the weight of the cover plate assembly 21, and thus reduce the weight of the battery 10; the groove 2112 is also beneficial to heat dissipation of the battery cell 20, and reduces the possibility of thermal runaway of the battery cell 20.

Specifically, as shown in fig. 8 to 11, the temperature collection region 211 is provided with a groove 2112, and correspondingly, at least a portion of the thermal pad 121 is located in the groove 2112, so that the thermal pad 121 does not slip relative to the first surface 21a under the limitation of the groove 2112, thereby ensuring the stability of the temperature collection device 12.

It is to be understood that the opening 2112a of the groove 2112 of the embodiment of the present application faces the outside of the battery cell 20, and the groove 2112 includes a bottom wall 2112b and a side wall, the bottom wall 2112b being the wall opposite to the opening 2112a, and the side wall being the wall adjacent to the opening 2112 a. The thermal pad 121 may be adhesively fixed to the bottom wall 2112b by an adhesive; further, in order to increase the stability of the thermal pad 121, the thermal pad 121 may also be fixed to the sidewall by adhesion, which is not limited in the embodiment of the present application.

Alternatively, the shape of the notch 2112 in the embodiment of the present application may be set according to practical applications. For example, the groove 2112 may be a circular groove or a rectangular groove, and for example, the surface of the bottom wall 2112b facing the outside of the battery cell 20 may be rectangular, for ease of machining.

In the present embodiment, the cap plate assembly 21 has a second surface facing the battery cell 20 opposite to the first surface 21a, and the bottom wall 2112b of the groove 2112 may be protruded or flush with respect to the second surface. Specifically, the region of the second surface corresponding to the bottom wall 2112b protrudes from the region of the second surface not corresponding to the bottom wall 2112 b; alternatively, the area of the second surface corresponding to the bottom wall 2112b is flush with the area of the second surface not corresponding to the bottom wall 2112b, wherein the second surface is flush except the area corresponding to the bottom wall 2112 b. However, in practical applications, the second surface of the cover plate assembly 21 may have irregularities, and therefore, the bottom wall 2112b may protrude or be flush with the area of the second surface around the bottom wall 2112 b. For the case that the bottom wall 2112b is flush with the area around the bottom wall 2112b on the second surface, the thickness of the groove 2112 is relatively small, which can effectively reduce the weight of the cover plate assembly 21 and is also beneficial to the heat dissipation of the battery cell 20 through the groove 2112; in the case that the bottom wall 2112b protrudes from the second surface to the area around the bottom wall 2112b, the thickness of the bottom wall 2112b can be kept consistent with the other areas of the cover plate assembly 21, so as to ensure the strength of the temperature collection region 211, and meanwhile, the bottom wall 2112b is closer to the inside of the battery cell 20, so that the temperature collected by the temperature collection device 12 is more accurate.

It should be understood that the above describes an embodiment in which the temperature acquisition region 211 is provided with a plurality of first protrusion structures 2111, taking fig. 3 to 7 as an example, and describes an embodiment in which the temperature acquisition region 211 is provided with grooves 2112, taking fig. 8 to 11 as an example. The two embodiments can be used separately and independently; alternatively, the two embodiments described above may also be combined with each other.

Specifically, fig. 12 shows another exploded schematic view of the temperature collection region 211 and the temperature collection device 12 according to the embodiment of the present application. As shown in fig. 12, in case the temperature acquisition region 211 is provided with a groove 2112, a bottom wall 2112b of the groove 2112 is provided with a plurality of second protrusion structures 2113 protruding toward the opening 2112 a. In this way, the relative sliding movement of the temperature collection device 12 can be restricted by the groove 2112, and the contact area between the temperature collection device 12 and the bottom wall 2112b of the groove 2112 can be increased by the second projection structure 2113.

In the present embodiment, as shown in fig. 12, when the bottom wall 2112b of the groove 2112 is provided with the plurality of second convex structures 2113 protruding toward the opening 2112a, the surface of the heat conduction pad 121 facing the bottom wall 2112b is provided with the plurality of concave structures 1211, and each of the second convex structures 2113 of the plurality of second convex structures 2113 is received in the corresponding concave structure 1211, so that the surface of the bottom wall 2112b facing the heat conduction pad 121 is fitted to the surface of the heat conduction pad 121 facing the bottom wall 2112b, and at least a part of the heat conduction pad 121 is located in the groove 2112.

It should be understood that the second protrusion structure 2113 is different from the first protrusion structure 2111 only in that the second protrusion structure 2113 protrudes from the bottom wall 2112b toward the outside of the battery cell 20, and the first protrusion structure 2111 protrudes from the first surface 21a toward the outside of the battery cell 20. Other configurations of the second protrusion structure 2113 are similar to the first protrusion structure 2111, and are applicable to the description of the first protrusion structure 2111, and for brevity, no further description is provided here.

For example, the plurality of second protruding structures 2113 of the embodiment of the present application may have the same or different shapes, and the plurality of second protruding structures 2113 may have the same or different sizes, and the plurality of recessed structures 1211 are disposed corresponding to the plurality of second protruding structures 2113. For example, as shown in fig. 12, the plurality of second raised structures 2113 may be identically shaped and identically sized, and correspondingly, the plurality of recessed structures 1211 may be identically formed and identically sized, such that the plurality of second raised structures 2113 and the plurality of recessed structures 1211 cooperate to facilitate fabrication and installation of the thermal pad 121 and the temperature acquisition region 211.

As shown in fig. 12, in some embodiments, the plurality of second raised structures 2113 includes a plurality of second raised structure columns arranged along the direction X, each second raised structure column of the plurality of second raised structure columns including at least two second raised structures 2113 arranged along the direction Y, the direction X being perpendicular to the direction Y. Thus, the plurality of second protrusion structures 2113 may be arranged according to a certain rule, further improving the processing efficiency.

In some embodiments, as shown in FIG. 12, the second raised structures 2113 are cones having axes perpendicular to the first surface 21a, which both facilitate processing and improve stability between the thermal pad 121 and the temperature acquisition region 211.

In the present embodiment, with the cover plate assembly 21 provided with the temperature-collecting devices 12 in the respective embodiments described above, the temperature-collecting devices 12 do not normally exceed the

electrode terminals

212a and 212b in the height direction Z. Specifically, in the height direction Z, the surface of the temperature collection device 12 away from the battery cell 20 is closer to the battery cell 20 than the surfaces of the

electrode terminals

212a and 212b away from the battery cell 20, so that the temperature collection device 12 does not protrude from the

electrode terminals

212a and 212b, and does not affect the mounting of the components located above the cover plate assembly 21 in the battery 10, for example, the mounting of the bus bar component.

Due to the limitation in the height direction Z, when the temperature collection area 211 is provided with the first protrusion structure 2111, the first protrusion structure 2111 should not be set too high to leave enough space for installing the temperature collection device 12. Similarly, when the temperature collection region 211 is provided with a recess 2112, the recess 2112 can accommodate at least a portion of the temperature collection device 12, and the installation space of the temperature collection device 12 can be increased; if the second protrusion structures 2113 are provided in the recess 2112, the height of the second protrusion structures 2113 is generally smaller than the depth of the recess 2112, so that the temperature collection device 12 can be at least partially accommodated in the recess 2112, and the temperature collection device 12 is prevented from protruding from the

electrode terminals

212a and 212 b.

The battery 10 in the embodiment of the present application includes a plurality of battery cells 20, wherein at least some of the battery cells 20 in the plurality of battery cells 20 are provided with a temperature collection region 211; for a plurality of battery cells 20 provided with the temperature collection regions 211, a temperature collection device 12 may be disposed in each temperature collection region 211, or alternatively, a part of the temperature collection regions 211 may be provided with the temperature collection device 12, and the temperature collection regions 211 without the temperature collection devices 12 may be used for heat dissipation, so as to reduce the possibility of thermal runaway of the battery cells 20. If the temperature acquisition device 12 is set less, that is, only acquires the temperature of a small number of battery cells 20, less temperature information may be collected, which is not favorable for optimizing the performance of the battery 10; if the temperature acquisition device 12 is more, that is, the temperature of the battery cells 20 in an excessive number is acquired, the temperature acquisition precision can be improved, the control efficiency of the battery 10 can be improved, but the circuit complexity of the temperature acquisition device 12 can be increased, and the installation is not facilitated. Therefore, the number of the temperature collection devices 12 should be set reasonably, and an appropriate number of the battery cells 20 should be selected for temperature collection.

While the 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 application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. Cover plate assembly (21) of a battery cell (20), characterized in that a first surface (21a) of the cover plate assembly (21) is provided with an temperature acquisition region (211), the temperature acquisition region (211) being provided with a groove (2112) or a plurality of first raised structures (2111),

wherein the first surface (21a) is a surface of the cover plate assembly (21) facing the outside of the battery cell (20), the first protrusion structure (2111) protrudes from the first surface (21a) to the outside of the battery cell (20), the opening (2112a) of the groove (2112) faces the outside of the battery cell (20), the temperature collection area (211) is used for arranging a temperature collection device (12), and the temperature collection device (12) is used for collecting the temperature of the battery cell (20).

2. The cover plate assembly (21) of claim 1, wherein the plurality of first raised structures (2111) are identical in shape and size.

3. The cover plate assembly (21) of claim 2, wherein the plurality of first raised structures (2111) includes a plurality of first raised structure columns, each of the plurality of first raised structure columns including at least two first raised structures (2111) aligned along a first direction, the first raised structure columns aligned perpendicular to the first direction.

4. The cover plate assembly (21) according to any one of claims 1 to 3, wherein the first raised structure (2111) is a cone, the axis of which is perpendicular to the first surface (21 a).

5. The decking assembly (21) according to claim 1, wherein the bottom wall (2112b) of the groove (2112) is provided with a plurality of second raised formations (2113) projecting towards the opening (2112 a).

6. The cover plate assembly (21) of claim 5, wherein the plurality of second raised structures (2113) are identical in shape and size.

7. The cover plate assembly (21) of claim 6, wherein the plurality of second raised structures (2113) includes a plurality of columns of second raised structures, each of the plurality of columns of second raised structures including at least two second raised structures (2113) aligned along a second direction, the plurality of columns of second raised structures aligned perpendicular to the second direction.

8. The cover plate assembly (21) according to any one of claims 5 to 7, wherein the height of the second protrusion structure (2113) is smaller than the depth of the groove (2112).

9. The cover plate assembly (21) according to any one of claims 5 to 7, wherein the second projection arrangement (2113) is a cone, the axis of which is perpendicular to the first surface (21 a).

10. The cover plate assembly (21) according to any one of claims 5 to 7, wherein the cover plate assembly (21) has a second surface facing the battery cell (20) opposite to the first surface (21a), and a region of the second surface corresponding to the bottom wall (2112b) is protruded beyond a region of the second surface not corresponding to the bottom wall (2112 b); or,

an area of the second surface corresponding to the bottom wall (2112b) is flush with an area of the second surface not corresponding to the bottom wall (2112 b).

11. The cover plate assembly (21) according to any one of claims 5 to 7, wherein a surface of the bottom wall (2112b) facing the outside of the battery cell (20) is rectangular.

12. The cover plate assembly (21) according to any one of claims 1 to 3, wherein the cover plate assembly (21) further comprises:

two electrode terminals (212a, 212b), the temperature acquisition region (211) being located between the two electrode terminals (212a, 212 b).

13. A battery cell (20), comprising:

the cover plate assembly (21) of any one of claims 1 to 12.

14. A battery, comprising:

a battery cell (20), the battery cell (20) comprising a cover plate assembly (21) according to any one of claims 1 to 12;

the temperature acquisition device (12), the temperature acquisition device (12) set up in temperature acquisition district (211), temperature acquisition device (12) are used for gathering the temperature of battery monomer (20).

15. The battery according to claim 14, characterized in that the temperature acquisition device (12) comprises a thermal pad (121) and a temperature sensor (122),

the thermal conductive pad (121) is disposed between a surface of the temperature collection region (211) facing the outside of the battery cell (20) and the temperature sensor (122), and the temperature sensor (122) is used for measuring the temperature of the battery cell (20) through the thermal conductive pad (121).

16. The battery according to claim 15, wherein the temperature acquisition region (211) is provided with the plurality of first raised structures (2111), a surface of the thermal pad (121) facing the temperature acquisition region (211) is provided with a plurality of recessed structures (1211),

each first raised structure (2111) of the plurality of first raised structures (2111) is received in a corresponding recessed structure (1211) to conform a surface of the thermal conduction pad (211) facing the thermal conduction pad (121) to a surface of the thermal conduction pad (121) facing the temperature acquisition region (211).

17. The battery according to claim 15, wherein the temperature collection region (211) is provided with the recess (2112), at least part of the thermal pad (121) being located within the recess (2112).

18. The battery according to claim 17, wherein a bottom wall (2112b) of the groove (2112) is provided with a plurality of second convex structures (2113) protruding toward the opening (2112a), and a surface of the thermal pad (121) facing the bottom wall (2112b) is provided with a plurality of concave structures (1211),

each second raised structure (2113) of the plurality of second raised structures (2113) is received in a corresponding recessed structure (1211) to conform a surface of the bottom wall (2112b) facing the thermal pad (121) to a surface of the thermal pad (121) facing the bottom wall (2112 b).

19. The battery according to any of claims 15 to 18, wherein the thermal pad (121) is bonded to the temperature acquisition region (211) by an adhesive.

20. An electrical device, comprising: a battery as claimed in any one of claims 14 to 19 for providing electrical energy to the powered device.