CN220963537U

CN220963537U - Battery monomer and end cover thereof, battery and power utilization device

Info

Publication number: CN220963537U
Application number: CN202420347018.8U
Authority: CN
Inventors: 庄永杰; 白璐璐; 郑挺; 李全坤
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-02-26
Filing date: 2024-02-26
Publication date: 2024-05-14
Anticipated expiration: 2034-02-26

Abstract

The application is applicable to the technical field of power batteries, and provides a battery monomer, an end cover of the battery monomer, a battery and an electric device, wherein the battery monomer comprises the end cover, the end cover comprises a first surface and a second surface which are oppositely arranged in the thickness direction of the end cover, the first surface is a plane, and a first groove is formed in the second surface; in the battery monomer provided by the application, the first surface of the end cover is made to be a plane so as to reduce the interference of the end cover on the connection of the bus plate to the battery monomer, thereby enabling the bus plate to be better and more stably connected to the battery monomer, simultaneously avoiding the need of arranging the bus plate into a special-shaped structure for avoiding the position, and the interference of the end cover on wiring can be reduced due to the fact that the first surface is made to be a plane; the first groove is formed in the second surface and is used for accommodating the insulating piece in the battery cell so as to increase the internal space of the battery cell, so that space can be provided for structures such as lugs and switching pieces in the battery cell, and the energy density of the battery cell is increased.

Description

Battery monomer and end cover thereof, battery and power utilization device

Technical Field

The application belongs to the technical field of power batteries, and particularly relates to a battery monomer, an end cover of the battery monomer, a battery and an electric device.

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.

Adjacent battery monomers inside the battery are conducted through a bus bar, and the bus bar is welded at a preset position of an end cover of the battery monomer. In the current battery cell, the end cover is generally provided with a convex structure protruding to the outside, and the convex structure easily has a negative effect on the welding of the bus bar.

Disclosure of utility model

In view of the above, the present application provides a battery cell, an end cover thereof, a battery and an electric device, which can reduce the negative influence of the top cover on the welding of the bus bar.

In a first aspect, an embodiment of the present application provides a battery cell, including:

the end cover comprises a first surface and a second surface which are oppositely arranged in the thickness direction of the end cover, the first surface is a plane, and a first groove is formed in the second surface.

In the technical scheme of the embodiment, the first surface of the end cover is made to be a plane so as to reduce the interference of the end cover on the connection of the bus plate to the battery cell, so that the bus plate can be better and more stably connected to the battery cell, meanwhile, the bus plate is not required to be set to be a special-shaped structure for avoiding, and the interference of the end cover on wiring can be reduced due to the fact that the first surface is made to be a plane; the first groove is formed in the second surface and is used for accommodating the insulating piece in the battery cell so as to increase the internal space of the battery cell, so that space can be provided for structures such as lugs and switching pieces in the battery cell, and the energy density of the battery cell is increased.

In some embodiments, the end cap is provided with a second slot opening onto the bottom wall of the first slot.

In the technical scheme of this embodiment, hold partial electrode terminal through the second groove to reduce electrode terminal to battery monomer inner space's occupation, and can reduce the difference in height between insulating part and the electrode terminal, so that insulating part, electrode terminal, utmost point ear, change piece among the battery monomer and other structures can lay inseparabler, thereby be convenient for better increase battery monomer's energy density.

In some embodiments, the projected area of the bottom wall of the first groove on the second surface is larger than the projected area of the bottom wall of the second groove on the second surface in the thickness direction of the end cover.

In the technical solution of this embodiment, since the first groove is used for accommodating the insulating member, and the insulating member needs to cover most of the area of the end cover, the projection area of the bottom wall of the first groove on the second surface is larger, so that the first groove can better accommodate the insulating member; meanwhile, the strength of the end cover is not too low, and the second groove is formed in the bottom wall of the first groove, namely, the end cover has lower strength at the second groove, so that the projection area of the second groove on the second surface is smaller, and the negative influence of the second groove on the strength of the end cover is reduced.

In some embodiments, the depth of the first groove is greater than 0 and the depth of the first groove is less than or equal to 2mm in the thickness direction of the end cap.

The technical solution of this embodiment provides a depth range of some first grooves, so that the first grooves can not only accommodate at least part of the insulating member to increase the energy density of the battery cell, but also reduce the negative influence of the first grooves on the strength of the end cover, so that the strength of the end cover can meet the requirements.

In some embodiments, the depth of the second groove is greater than 0 and the depth of the second groove is less than or equal to 2mm in the thickness direction of the end cap.

The technical solution of this embodiment provides a depth range of some second grooves, so that the second grooves can not only accommodate part of the electrode terminals to increase the energy density of the battery cell, but also reduce the negative influence of the second grooves on the strength of the end cover, so that the strength of the end cover can meet the requirements.

In some embodiments, the thickness of the end cap where the thickness of the end cap is at a minimum is greater than or equal to 1.2mm in the thickness direction of the end cap.

The technical scheme of the embodiment provides the thickness range of the end cover at the minimum thickness position, so that the strength of the end cover at the minimum thickness position can also meet the requirements.

In some embodiments, the end cap is provided with a through hole, the through hole penetrates through the end cap along the thickness direction of the end cap, and the through hole is communicated with the first groove and the second groove.

In the technical scheme of the embodiment, the end cover comprises a through hole so that the electrode terminal passes through the through hole and is connected with a structure outside the battery cell; the through holes are communicated with the first groove and the second groove, so that part of electrode terminals located inside the battery cells can be contained in the second groove, occupation of the electrode terminals to the inner space of the battery cells is reduced, and energy density of the battery cells is increased.

In some embodiments, the end cap further comprises a reinforcing structure disposed within the first channel.

In the technical scheme of this embodiment, because first groove and second groove have been seted up on the end cover, so set up additional strengthening on the end cover to increase the intensity of end cover through additional strengthening, thereby make the intensity of end cover can satisfy the requirement, reduce the battery monomer and appear in the circumstances that the end cover warp under gas production or other circumstances.

In some embodiments, the reinforcing structure includes a first reinforcing member, opposite ends of the first reinforcing member being connected to opposite sidewalls of the first groove, respectively.

In the technical solution of this embodiment, the reinforcing structure includes a first reinforcing member, and two ends of the first reinforcing member are respectively connected to two opposite sidewalls of the first groove, so as to increase the overall strength of the end cover.

In some embodiments, there are at least two first stiffeners spaced apart along the width or length of the end cap.

In the technical scheme of the embodiment, at least two first reinforcing pieces are arranged to better increase the strength of the end cover; at the same time, at least two first reinforcing members are arranged at intervals so as to reduce the occupation of the first reinforcing members to the inner space of the first groove, and the first groove is convenient for accommodating the insulating member.

In some embodiments, the reinforcing structure further comprises a second reinforcing member disposed within the first groove.

In the technical solution of this embodiment, the reinforcing structure further includes a second reinforcing member, so as to further increase the overall strength of the end cover.

In some embodiments, opposite ends of the second reinforcement are respectively connected to adjacent sidewalls of the first groove.

The technical solution of the present embodiment provides some connection modes of the second reinforcement member, so as to increase the overall strength of the end cover.

In some embodiments, opposite sides of the second stiffener are connected to the sidewall of the first slot and the first stiffener, respectively.

The technical scheme of the embodiment provides other connection modes of the second reinforcing piece so as to increase the integral strength of the end cover; and meanwhile, the integrity of the first reinforcing piece, the second reinforcing piece and the end cover is improved, and the integral strength of the end cover is further improved.

In some embodiments, the second reinforcement members are connected at opposite ends to adjacent ones of the first reinforcement members, respectively.

The technical proposal of the embodiment provides other connection modes of the second reinforcement so as to increase the integral strength of the end cover; and meanwhile, the integrity of the first reinforcing piece and the second reinforcing piece is improved, so that the integral strength of the end cover is further improved.

In some embodiments, the projection of the reinforcing structure onto the bottom wall of the first groove does not overlap with the projection of the bottom wall of the second groove onto the wall of the first groove bottom in the thickness direction of the end cap.

The technical scheme of this embodiment can make the additional strengthening can not stride across the second groove to reduce the interference that additional strengthening held electrode terminal to the second groove, and make electrode terminal can better hold in the second groove, thereby can better increase the free energy density of battery.

In some embodiments, a surface of the reinforcing structure facing away from the bottom wall of the first groove is flush with the second surface; or (b)

The surface of the reinforcing structure facing away from the bottom wall of the first groove is located in the first groove.

The technical scheme of this embodiment can reduce that the condition of additional strengthening outside first groove of end cover thickness direction protrusion appears to reduce the occupation of additional strengthening to battery monomer inner space, thereby can be better increase battery monomer energy density.

In some embodiments, the battery cell further includes an insulator, at least a portion of which is received in the first slot.

In the technical scheme of the embodiment, the end cover, the electrode terminal and the electrode assembly in the battery cell are separated by the insulating piece, so that the safety and the stability of the battery cell are improved; at least part of the insulating piece is contained in the first groove, so that the occupation of the insulating piece to the inner space of the battery cell is reduced, and the energy density of the battery cell is increased conveniently.

In some embodiments, a side of the insulating member facing the end cap is provided with a clearance groove for accommodating the reinforcing structure.

In the technical scheme of this embodiment, set up on the insulating part and keep away the position groove in order to keep away a additional strengthening to reduce additional strengthening and install the interference in first inslot to the insulating part, and make more parts of insulating part can be held in first inslot, thereby increase battery cell's energy density that can be better.

In some embodiments, the battery cell further includes an electrode terminal and an electrode assembly electrically connected to the electrode terminal;

The electrode terminal includes a first portion and a second portion connected to each other in a thickness direction of the end cap, at least a portion of the first portion being received in the second groove, the second portion penetrating the through-hole.

The technical scheme of the embodiment provides structures of some electrode terminals, so that the first step of the electrode terminals can be accommodated in the second groove, and occupation of the first step to the inner space of the battery cell is reduced, thereby increasing energy density of the battery cell.

In some embodiments, the end cap further comprises a third groove open at the first surface, the third groove in communication with the through hole;

The electrode terminal further includes a third portion connected to an end of the second portion opposite to the first portion;

The battery cell also includes a fixing member coupled to the third portion, at least a portion of the fixing member being received in the third slot.

The technical scheme of the embodiment provides structures of other electrode terminals, so that the fixing piece is connected to the third part of the electrode terminal, and the electrode terminal is fixed on the end cover; a third groove is formed in the first surface and at least part of the fixing member is accommodated in the third groove, so that the height of the fixing member protruding from the first surface is reduced, and the height difference between the current electrode terminal and the first surface is reduced, so that the bus bar can be welded to the electrode terminal more stably.

In a second aspect, some embodiments of the present application further provide an end cap, where the end cap includes a first surface and a second surface disposed opposite to each other in a thickness direction of the end cap, the first surface being planar, and the second surface having a first groove formed therein.

In a third aspect, some embodiments of the present application also provide a battery, including the battery cells provided by some embodiments of the first aspect.

In a fourth aspect, some embodiments of the present application also provide an electrical device comprising a battery provided by some embodiments of the third aspect.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

Fig. 1 is a schematic structural diagram of an electric device according to some embodiments of the present application.

Fig. 2 is a schematic view of an explosion structure of a battery according to 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 schematic top view of an end cap and an electrode terminal in a battery cell according to some embodiments of the application.

Fig. 5 is a schematic cross-sectional view at A-A in fig. 4.

Fig. 6 is a partially enlarged schematic structural view at B in fig. 5.

Fig. 7 is a partially enlarged schematic view of the structure at C in fig. 6.

Fig. 8 is a partially enlarged schematic structural view of fig. 6 at D.

Fig. 9 is a schematic perspective view illustrating an end cap in a battery cell according to some embodiments of the present application.

Fig. 10 is a schematic diagram showing a second perspective structure of an end cap in a battery cell according to some embodiments of the present application.

Fig. 11 is a schematic three-dimensional view of an end cap in a battery cell according to some embodiments of the present application.

Fig. 12 is a schematic perspective view of an end cap in a battery cell according to some embodiments of the present application.

Fig. 13 is a schematic perspective view illustrating an insulating member in a battery cell according to some embodiments of the present application.

The meaning of the labels in the figures is:

100. An electric device;

10. a motor;

20. a controller;

200. A battery;

30. a case; 31. an upper case; 32. a lower box body;

300. A battery cell;

40. An end cap; 401. a first surface; 402. a second surface; 41. a first groove; 42. a second groove; 43. a through hole; 44. a reinforcing structure; 441. a first reinforcement; 442. a second reinforcement; 45. a third groove;

50. A housing;

60. An insulating member; 61. a clearance groove;

70. An electrode terminal; 71. a first section; 72. a second section; 73. a third section;

80. an electrode assembly; 90. and a fixing piece.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the 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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein 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 appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

The battery cells in the battery are generally electrically connected with each other through a bus bar, and the bus bar needs to be arranged at an end cover of the battery cell, in particular to an electrode terminal on the end cover; the bus bar mainly bears the functions of power transmission and mechanical connection between the battery cells so as to connect the battery cells and form the whole battery module.

In the current battery cells, in order to increase or decrease the internal space of the battery cell, the end cover is usually protruded (e.g. protruded upwards) out of the battery cell, and is easy to have a negative effect on the busbar. Specifically, because the both ends of converging the piece are connected respectively on two battery cell's electrode terminal, the piece that converges needs to cross the bulge on the end cover this moment, for making the piece that converges can be comparatively stable connect on electrode terminal, the piece that converges needs to make corresponding dysmorphism design according to the shape of end cover bulge.

Besides the bus plate, the battery is also provided with a wire harness, a partition plate and other structures, and the protruding part on the end cover also can interfere the arrangement of the wire harness, the partition plate and other structures, so that the design and the arrangement difficulty of the internal structure of the battery are increased.

Based on the above consideration, in order to reduce the interference of the end cover on the bus plate, the wire harness, the isolation plate or other structural arrangement in the battery, the embodiment of the application provides a battery cell, wherein the first surface of the end cover facing the outside is a plane, and the second surface of the end cover facing the inside of the battery cell is provided with a first groove.

In such a battery cell, the first surface is a plane, so that the interference of the end cover on the arrangement of other structures in the battery box body such as the bus bar, the wire harness and the isolation plate can be reduced, the two ends of the bus bar can be better connected to the electrode terminals without special-shaped design, and meanwhile, the arrangement of the structures such as the wire harness is convenient; the first groove can increase the internal space of the battery cell so as to provide more installation space for the internal structures of the battery cell such as the tab, the switching piece and the like, thereby increasing the energy density of the battery cell. The battery cell provided by the embodiment of the application not only can increase the energy density of the battery cell, but also can reduce the interference on the structural arrangement of the bus plate, the wire harness, the isolation plate and the like.

The battery cell disclosed by the embodiment of the application can be used for an electric device using a battery as a power supply or various energy storage systems using the battery as an energy storage element. The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. 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 embodiment will take an electric device 100 according to an embodiment of the present application as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electric device 100 according to some embodiments of the present application. The vehicle can be a fuel oil vehicle, a fuel 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. The battery 200 is provided in the interior of the vehicle, and the battery 200 may be provided at the bottom or the head or the tail of the vehicle. The battery 200 may be used for power supply of a vehicle, for example, the battery 200 may be used as an operating power source of the vehicle. The vehicle may also include a controller 20 and a motor 10, the controller 20 being configured to control the battery 200 to power the motor 10, for example, for operating power requirements during start-up, navigation, and travel of the vehicle.

In some embodiments of the application, the battery 200 may be used not only as an operating power source for a vehicle, but also as a driving power source for a vehicle to supply driving power to the vehicle instead of or in part instead of fuel oil or natural gas.

Referring to fig. 2, fig. 2 is an exploded view of a battery 200 according to some embodiments of the present application. The battery 200 includes a case 30 and a battery cell 300, and the battery cell 300 is accommodated in the case 30. The case 30 is used to provide an accommodating space for the battery cell 300, and the case 30 may have various structures. In some embodiments, the case 30 may include an upper case 31 and a lower case 32, the upper case 31 and the lower case 32 being covered with each other, the upper case 31 and the lower case 32 together defining an accommodating space for accommodating the battery cell 300. The lower case 32 may have a hollow structure with one end opened, the upper case 31 may have a plate-shaped structure, and the upper case 31 covers the opening side of the lower case 32, so that the upper case 31 and the lower case 32 define an accommodating space together; the upper case 31 and the lower case 32 may be hollow structures each having an opening at one side, and the opening side of the upper case 31 may be closed to the opening side of the lower case 32. Of course, the case 30 formed by the upper case 31 and the lower case 32 may be of various shapes, such as a cylinder, a rectangular parallelepiped, etc.

In the battery 200, the number of the battery cells 300 may be plural, and the plural battery cells 300 may be connected in series, parallel, or series-parallel, where series-parallel refers to both of the plural battery cells 300 being connected in series and parallel. The plurality of battery cells 300 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 300 is accommodated in the box 30; of course, the battery 200 may also be a form of a plurality of battery cells 300 connected in series or parallel or series-parallel to form a battery 200 module, and a plurality of battery 200 modules connected in series or parallel or series-parallel to form a whole and accommodated in the case 30. The battery 200 may further include other structures, for example, the battery 200 may further include a bus bar member for making electrical connection between the plurality of battery cells 300.

Wherein each battery cell 300 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 300 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 300 according to some embodiments of the present application. The battery cell 300 refers to the smallest unit constituting the battery 200. As shown, the battery cell 300 includes the end cap 40, the case 50, the electrode assembly 80, and other functional components.

The end cap 40 refers to a member that is covered at the opening of the case 50 to isolate the inner environment of the battery cell 300 from the outer environment. The cap 40 may be provided with functional parts such as electrode terminals 70. The electrode terminal 70 may be used to be electrically connected with the electrode assembly 80 for outputting or inputting electric power of the battery cell 300. In some embodiments, the end cap 40 may also be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 300 reaches a threshold. In some embodiments, an insulator 60 may also be provided on the inside of the end cap 40, the insulator 60 may be used to isolate electrical connection components within the housing 50 from the end cap 40 to reduce the risk of shorting. By way of example, the insulator 60 may be plastic, rubber, or the like.

The case 50 is an assembly for mating with the end cap 40 to form an internal environment of the battery cell 300, wherein the formed internal environment may be used to house the electrode assembly 80, electrolyte, and other components. The case 50 and the end cap 40 may be separate components, and an opening may be provided in the case 50, and the interior of the battery cell 300 may be formed by covering the opening with the end cap 40 at the opening. It is also possible to integrate the end cap 40 and the housing 50, but specifically, the end cap 40 and the housing 50 may form a common connection surface before other components are put into the housing, and when the interior of the housing 50 needs to be sealed, the end cap 40 is then covered with the housing 50. The housing 50 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 50 may be determined according to the specific shape and size of the electrode assembly 80. The material of the housing 50 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 electrode assembly 80 is a component in which an electrochemical reaction occurs in the battery cell 300. One or more electrode assemblies 80 may be contained within the housing 50. The electrode assembly 80 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having active material constitute the main body portion of the electrode assembly 80, and the portions of the positive and negative electrode sheets having no active material constitute the tabs, 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 200, the positive and negative electrode active materials react with the electrolyte, and the tab is connected to the electrode terminal 70 to form a current loop.

In a first aspect, referring to fig. 3 to 6, some embodiments of the present application provide a battery cell 300, where the battery cell 300 includes an end cap 40, and the end cap 40 includes a first surface 401 and a second surface 402 opposite to each other in a thickness direction of the end cap 40, the first surface 401 is a plane, and the second surface 402 is provided with a first groove 41.

Referring to fig. 3 and 5, the direction of the X axis is the length direction of the battery cell 300; the direction in which the Y axis is located is the width direction of the battery cell 300; the Z-axis is located in the height direction of the battery cell 300 and also in the thickness direction of the cap 40.

The end cap 40 refers to a member of the battery cell 300 for engaging the case 50 to isolate the internal environment of the battery cell 300 from the external environment; the shape of the end cap 40 may be rectangular, circular or other shape, and the shape of the end cap 40 may also be adapted to the shape of the housing 50 to fit the housing 50; the material of the end cover 40 may include metal, plastic or other materials, and by way of example, the material of the end cover 40 may include a material having a certain hardness and strength (such as an aluminum alloy), so that the end cover 40 is not easy to deform when being impacted by extrusion, thereby enabling the battery cell 300 to have a higher structural strength and improving the safety performance of the battery cell 300.

The end cap 40 has a first surface 401 and a second surface 402, and the first surface 401 and the second surface 402 are disposed opposite to each other in the thickness direction (Z) of the end cap 40.

The first surface 401 of the end cap 40 refers to the surface of the end cap 40 facing the environment outside the battery cell 300; the first surface 401 may be a smooth and horizontal surface, or a substantially smooth and substantially horizontal surface having microscopic irregularities; at this time, the first surface 401 has no structure protruding to the outside of the battery cell 300, so as to reduce interference of the end cover 40 with the arrangement of the bus bar, the wire harness, and the like.

The second surface 402 of the end cap 40 refers to the surface of the end cap 40 opposite the first surface 401, i.e., the second surface 402 is the surface of the end cap 40 that faces the interior of the battery cell 300; with the end cap 40 capped to the housing 50, the second surface 402 is located inside the battery cell 300.

The first groove 41 has a groove structure formed on the second surface 402, and when the end cap 40 is covered on the case 50, the first groove 41 has a groove structure that is open toward the inside of the battery cell 300 and recessed toward the inside of the end cap 40; the first groove 41 may be a circular groove, a square groove, or other shaped groove structure.

The first groove 41 is mainly used for increasing the internal space of the battery cell 300, and since the first groove 41 is formed on the end cover 40, the first groove 41 can be used for accommodating components inside the battery cell 300, such as a tab, a switching piece, an insulating piece 60, and the like; depending on the thickness of the end cap 40, the first groove 41 may accommodate only a part of the structure of the tab, the insulator 60, etc., or may accommodate the structure of the tab, the insulator 60, etc. entirely.

Depending on the configuration in which the first groove 41 is specifically accommodated, the first groove 41 may cover only a small portion of the second surface 402, or may cover a large portion of the second surface 402.

By way of example, the first groove 41 may be used to receive a portion of the insulator 60, while the first groove 41 may also be used to fuse portions of the adapter plate, seal ring.

The first grooves 41 can increase the inner space of the battery cell 300 and accommodate a part of the structure in the battery cell 300, so that the battery cell 300 can have more space to accommodate the electrode assembly 80, thereby being capable of functioning to increase the energy density of the battery cell 300.

In this embodiment, the first surface 401 of the end cover 40 is made to be a plane, so as to reduce the interference of the end cover 40 on the connection of the bus bar to the battery cell 300, so that the bus bar can be better and more stably connected to the battery cell 300, and meanwhile, the bus bar does not need to be set to be a special-shaped structure for avoiding, and the interference of the end cover 40 on the wiring can be reduced due to the first surface 401 being a plane; the first groove 41 is provided on the second surface 402, and the first groove 41 is used for accommodating the insulating member 60 in the battery cell 300, so as to increase the internal space of the battery cell 300, thereby providing space for the tab, the switching piece and other structures in the battery cell 300, and increasing the energy density of the battery cell 300.

Referring to fig. 4-7, in some embodiments, the end cap 40 is provided with a second slot 42 that opens onto the bottom wall of the first slot 41.

The bottom wall of the first groove 41 is an inner wall of the first groove 41 opposite to the opening thereof, and the bottom wall of the first groove 41 is located above the electrode assembly 80 in the case where the cap 40 is covered with the case 50; in addition to the bottom wall, the first groove 41 includes a side wall connected to the bottom wall, and the bottom wall and the side wall of the first groove 41 can collectively enclose an inner space of the first groove 41.

The second groove 42 is a groove structure formed on the bottom wall of the first groove 41, and the second groove 42 is a groove structure which is opened towards the first groove 41 and concavely arranged towards the inside of the end cover 40, so that the second groove 42 can be communicated with the first groove 41; with the end cap 40 covered on the case 50, the opening of the second groove 42 faces the inside of the battery cell 300; the second groove 42 may be a circular groove, a square groove, or other shaped groove configuration.

The second groove 42 is mainly used for increasing the internal space of the battery cell 300, and since the second groove 42 is formed on the end cover 40 and on the bottom wall of the first groove 41, the second groove 42 can also be used for accommodating the structures such as the tab, the switching piece, the insulator 60, etc., and the second groove 42 can also accommodate the structures such as the electrode terminal 70, the gasket, etc.; depending on the thickness of the end cap 40, the second slot 42 may receive only a portion of the corresponding structure or may fully receive the corresponding structure.

Depending on the structure in which the second groove 42 is specifically accommodated, the second groove 42 may cover only a small portion of the bottom wall of the first groove 41, or may cover a large portion of the bottom wall of the first groove 41.

In some embodiments, the second groove 42 may be used to receive a seal ring; in other embodiments, the second groove 42 may also be used to accommodate a portion of the electrode terminal 70, and in the case where the first groove 41 is used to accommodate the insulating member 60, the second groove 42 accommodates the portion of the electrode terminal 70 to reduce a height difference between a side of the electrode terminal 70 facing the inside of the battery cell 300 and a side of the insulating member 60 facing the inside of the battery cell 300, so that the arrangement of the tab, the switching piece, and the insulating member 60 in the battery cell 300 can be more compact and occupy a smaller space, thereby facilitating an increase in energy density of the battery cell 300.

In this embodiment, the second groove 42 accommodates a portion of the electrode terminal 70, so as to reduce the occupation of the electrode terminal 70 to the internal space of the battery cell 300, and reduce the height difference between the insulating member 60 and the electrode terminal 70, so that the structures such as the insulating member 60, the electrode terminal 70, the tab, the switching piece, etc. in the battery cell 300 can be arranged more tightly, thereby facilitating better increase of the energy density of the battery cell 300.

Referring to fig. 4 to 7, in some embodiments, in the thickness direction of the end cover 40, the projected area of the bottom wall of the first groove 41 on the second surface 402 is larger than the projected area of the bottom wall of the second groove 42 on the second surface 402.

The projection of the bottom wall of the first groove 41 onto the second surface 402 in the thickness direction (Z) of the end cap 40 means that the larger the projected area is, the larger the area of the bottom wall of the first groove 41 covering the second surface 402 is, and the larger the accommodation space of the first groove 41 is.

For example, in the case that the insulating member 60 is received in the first groove 41, the larger area of the first groove 41 covering the second surface 402 can allow more portion of the insulating member 60 to be received in the first groove 41, so that the space occupied by the insulating member 60 for the electrode assembly 80 can be reduced, and thus the energy density of the battery cell 300 can be better increased.

The projection of the bottom wall of the second groove 42 on the second surface 402 in the thickness direction (Z) of the end cover 40 refers to the coverage area of the bottom wall of the second groove 42 on the second surface 402, and since the second groove 42 is opened on the bottom wall of the first groove 41, the projection area also refers to the coverage area of the bottom wall of the second groove 42 on the bottom wall of the first groove 41; since the second groove 42 is formed in the bottom wall of the first groove 41, the end cap 40 has a thinner thickness and lower strength at the second groove 42, and the larger the projected area of the bottom wall of the second groove 42 on the second surface 402 in the thickness direction (Z) of the end cap 40 is, the larger the area of the second groove 42 covering the second surface 402 is, and the more the lower strength of the end cap 40 is.

The projected area of the bottom wall of the first groove 41 on the second surface 402 is larger than the projected area of the second groove 42 on the second surface 402, that is, the area of the second surface 402 covered by the first groove 41 is larger, and the area of the bottom wall of the first groove 41 covered by the second groove 42 is smaller; since the first groove 41 is mainly used for accommodating the structures such as the insulator 60, the tab and the switching piece, the first groove 41 covers a larger area to better accommodate the structures; since the second groove 42 is mainly used for accommodating a portion of the electrode terminal 70, and the projected area of the electrode terminal 70 on the second surface 402 in the thickness direction (Z) is generally smaller, the smaller covered area of the second groove 42 can reduce the adverse effect on the overall strength of the end cap 40 on the premise that the second groove 42 can accommodate a portion of the electrode terminal 70.

In this embodiment, since the first groove 41 is used for accommodating the insulating member 60, and the insulating member 60 needs to cover most of the area of the end cap 40, the area of the bottom wall of the first groove 41 on the second surface 402 is larger, so that the first groove 41 can better accommodate the insulating member 60; meanwhile, since the strength of the end cap 40 should not be too low, and the second groove 42 is formed in the bottom wall of the first groove 41, that is, the end cap 40 has a lower strength at the second groove 42, the projected area of the second groove 42 on the second surface 402 is smaller, so as to reduce the negative influence of the second groove 42 on the strength of the end cap 40.

Referring to fig. 4 to 8, in some embodiments, the depth of the first groove 41 is greater than 0 in the thickness direction of the end cap 40, and the depth of the first groove 41 is less than or equal to 2mm (millimeters).

The depth of the first groove 41 in the thickness direction (Z) of the end cap 40 means the depth at which the first groove 41 is recessed inward of the end cap 40; by way of example, referring to fig. 7, the depth of the first groove 41 is the dimension indicated by h1 in the figure.

The depth of the first groove 41 is greater than 0, and the depth of the first groove 41 is less than or equal to 2mm, and the depth of the first groove 41 may be 0.1mm, 0.3mm, 0.5mm, 0.7mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, or other values.

By way of example, the depth of the first groove 41 may be a value of 0.1mm or less, i.e., the depth of the first groove 41 is shallower at this time, so that the end cap 40 can have higher strength, thereby reducing the deformation amount of the end cap 40 when the battery cell 300 generates gas.

By way of example, the depth of the first groove 41 may be 1mm, which may increase the accommodating space of the structure such as the insulating member 60 to increase the energy density of the battery cell 300, and may also reduce the adverse effect of the first groove 41 on the strength of the end cap 40, thereby reducing the deformation amount of the end cap 40 when the battery cell 300 generates gas.

By way of example, the depth of the first groove 41 may be 2mm, i.e., the depth of the first groove 41 is deeper at this time, so that there is more space in the battery cell 300 to better increase the energy density of the battery cell 300.

It will be appreciated that, on the basis that the depth of the first groove 41 is greater than 0 and the depth of the first groove 41 is less than or equal to 2mm, the depth of the first groove 41 should be less than the thickness of the end cap 40 to reduce the occurrence of the first groove 41 penetrating the end cap 40.

The present embodiment provides a range of depths for the first slots 41 such that the first slots 41 can both accommodate at least a portion of the insulator 60 to increase the energy density of the battery cell 300 and also reduce the negative impact of the first slots 41 on the strength of the end cap 40 such that the strength of the end cap 40 can meet the requirements.

Referring to fig. 4-8, in some embodiments, the depth of the second groove 42 is greater than 0 and the depth of the second groove 42 is less than or equal to 2mm in the thickness direction of the end cap 40.

The depth of the first groove 41 in the thickness direction (Z) of the end cap 40 means the depth at which the first groove 41 is recessed inward of the end cap 40; by way of example, referring to fig. 8, the depth of the first groove 41 is the dimension indicated by h2 in the figure.

The depth of the second groove 42 is greater than 0, and the depth of the second groove 42 is less than or equal to 2mm, and the depth of the second groove 42 may be 0.1mm, 0.3mm, 0.5mm, 0.7mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, or other values.

By way of example, the depth of the second groove 42 may be a value of 0.1mm or less, i.e., the depth of the second groove 42 is shallower at this time, so that the second groove 42 has less negative effect on the strength of the end cap 40, thereby reducing the amount of deformation of the end cap 40 when the battery cell 300 is producing gas.

By way of example, the depth of the second groove 42 may be 1mm, which may increase the accommodating space of the electrode terminal 70 and the like to increase the energy density of the battery cell 300, and may also prevent the negative influence of the second groove 42 on the strength of the end cap 40 from being excessive, thereby reducing the deformation amount of the end cap 40 when the battery cell 300 generates gas.

By way of example, the depth of the second groove 42 may be 2mm, i.e., the depth of the second groove 42 is deeper at this time, to enable more space in the cell 300 to better increase the energy density of the cell 300.

It will be appreciated that, based on the depth of the second groove 42 being greater than 0 and the depth of the second groove 42 being less than or equal to 2mm, the depth of the second groove 42 should be less than the thickness of the end cap 40 to reduce the occurrence of the second groove 42 penetrating the end cap 40.

The present embodiment provides a range of depths of some of the second grooves 42 such that the second grooves 42 can both accommodate a portion of the electrode terminals 70 to increase the energy density of the battery cell 300 and also reduce the negative influence of the second grooves 42 on the strength of the end cap 40 such that the strength of the end cap 40 can meet the requirements.

Referring to fig. 4-8, in some embodiments, the thickness of the end cap 40 where the thickness of the end cap 40 is at a minimum is greater than or equal to 1.2mm in the thickness direction of the end cap 40.

When only the first groove 41 is provided in the end cap 40, the portion of the end cap 40 where the thickness in the thickness direction (Z) is smallest is the portion of the end cap 40 facing the first groove 41; in the case where the first groove 41 and the second groove 42 are provided in the end cap 40, the portion of the end cap 40 where the thickness in the thickness direction (Z) is smallest is a portion of the end cap 40 facing the second groove 42.

The thickness of the end cap 40 at the minimum thickness in the thickness direction (Z) may be 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, or other values.

By way of example, the thickness of the end cap 40 at the minimum thickness in the thickness direction (Z) is 1.2mm, so that the negative influence of the first and second grooves 41, 42 on the strength of the end cap 40 is reduced, thereby reducing the deformation amount of the end cap 40 when the battery cell 300 generates gas.

The present embodiment provides a range of thickness of the end cap 40 where the thickness is minimized so that the strength of the end cap 40 where the thickness is minimized is also satisfactory.

Referring to fig. 9, in some embodiments, the end cap 40 is provided with a through hole 43, the through hole 43 penetrates the end cap 40 in the thickness direction of the end cap 40, and the through hole 43 communicates with the first groove 41 and the second groove 42.

The through hole 43 refers to a hole structure penetrating through the end cap 40 in the thickness direction (Z), the through hole 43 may be a square hole, a circular hole or another hole structure, and the through hole 43 may be a stepped hole, a tapered hole or another hole structure.

The through holes 43 are used for allowing one end of the electrode terminal 70 to pass through and extend out of the battery cell 300, and the through holes 43 are communicated with the first groove 41 and the second groove 42, so that the electrode terminal 70 can be partially accommodated in the first groove 41 and the second groove 42 under the condition that the electrode terminal 70 passes through the through holes 43, and therefore, the insulating piece 60, the tab, the switching piece or other structures adjacent to or connected with the electrode terminal 70 can be accommodated in the first groove 41 and the second groove 42, and further, the structures of the insulating piece 60, the electrode terminal 70 and the like can be more tightly arranged in the battery cell 300, and the energy density of the battery cell 300 can be increased.

In the present embodiment, the end cap 40 is provided with a through-hole 43 so that the electrode terminal 70 passes through the through-hole 43 and is coupled to a structure other than the battery cell 300; the through holes 43 are communicated with both the first and second grooves 41 and 42 so that a portion of the electrode terminals 70 located inside the battery cell 300 can be received in the second groove 42 to reduce the occupation of the electrode terminals 70 to the inner space of the battery cell 300 and increase the energy density of the battery cell 300.

Referring to fig. 10-12, in some embodiments, the end cap 40 further includes a reinforcing structure 44, the reinforcing structure 44 being disposed within the first slot 41.

Reinforcing structure 44 refers to a structure on end cap 40 that serves to increase the strength of end cap 40, and reinforcing structure 44 may include a frame structure, beams, ribs, or other structures; the material of the reinforcing structure 44 may include metal, plastic or other materials, and the material of the reinforcing structure 44 may be the same as or different from that of the end cap 40.

The reinforcing structure 44 is disposed in the first groove 41, and the reinforcing structure 44 may be only partially accommodated in the first groove 41 or may be completely accommodated in the first groove 41; the reinforcing structure 44 may be attached to the bottom wall of the first tank 41, or may be attached to the side wall of the first tank 41, and the reinforcing structure 44 may be attached to the bottom wall or the side wall of the first tank 41 by welding, bonding or other means, or may be attached to the bottom wall or the side wall of the first tank 41 by integral molding or other means.

In this embodiment, since the end cover 40 is provided with the first groove 41 and the second groove 42, the end cover 40 is provided with the reinforcing structure 44, so that the strength of the end cover 40 is increased by the reinforcing structure 44, thereby enabling the strength of the end cover 40 to meet the requirement and reducing the occurrence of deformation of the end cover 40 under the condition of gas production or other conditions of the battery cell 300; the reinforcing structure 44 is disposed in the first groove 41, so that the occupation of the reinforcing structure 44 to the internal space of the battery cell 300 can be reduced, and the negative influence of the reinforcing structure 44 on the energy density of the battery cell 300 can be reduced.

Referring to fig. 10 to 12, in some embodiments, the reinforcing structure 44 includes a first reinforcing member 441, and opposite ends of the first reinforcing member 441 are respectively connected to opposite sidewalls of the first groove 41.

The first reinforcing member 441 refers to a part of the structure in the reinforcing structure 44, the first reinforcing member 441 may be a bar beam structure or other structures, and the cross-sectional shape of the first reinforcing member 441 may be rectangular, circular, trapezoidal or other shapes; the material of the first reinforcing member 441 may include metal, plastic or other materials; the number of the first reinforcing members 441 may be one, or may be two or more.

Opposite ends of the first reinforcing member 441 are respectively connected to opposite sidewalls of the first groove 41; for example, the first reinforcing member 441 may extend along the length direction (X) of the end cap 40 and be connected to opposite side walls of the first groove 41 along the length direction (X) of the end cap 40; for another example, the first reinforcing member 441 may extend in the width direction (Y) of the end cover 40 and be connected to both side walls of the first groove 41 opposite to each other in the width direction (Y) of the end cover 40.

The first reinforcing member 441 can increase the deformation resistance of the end cap 40, such as increasing the shear resistance of the end cap 40, when the end cap 40 is subjected to a force generated by an increase in the internal gas pressure of the battery cell 300; the first reinforcing member 441 can also increase the torsion resistance of the end cap 40 when the end cap 40 is deformed by an external force.

In this embodiment, the reinforcing structure 44 includes a first reinforcing member 441, and two ends of the first reinforcing member 441 are respectively connected to two opposite sidewalls of the first groove 41, so as to increase the overall strength of the end cover 40.

Referring to fig. 10 to 12, in some embodiments, there are at least two first reinforcing members 441, and at least two first reinforcing members 441 are spaced apart in a width direction or a length direction of the end cover 40.

The first reinforcing member 441 may be two or three or more; as the number of the first reinforcing members 441 increases, the strength of the end cap 40 increases, but the space of the first groove 41 for accommodating the structures such as the insulating member 60 decreases accordingly, and the effect of the end cap 40 on the increase in the energy density of the battery cell 300 is worse; for example, there are four first stiffeners 441.

At least two first reinforcing members 441 are disposed at intervals in the width direction (Y) of the end cap 40 or in the length direction (X) of the end cap 40, and at least two first reinforcing members 441 may be disposed at intervals in the width direction (Y) of the end cap 40, in which case the extending direction of the first reinforcing members 441 may be parallel to the length direction (X) of the end cap 40; at least two first reinforcing members 441 may also be disposed at intervals along the length direction (X) of the end cap 40, and the extending direction of the first reinforcing members 441 may be parallel to the width direction (Y) of the end cap 40.

All the first reinforcing members 441 may be disposed at intervals along the width direction (Y) of the end cover 40 or the length direction (X) of the end cover 40, or only a portion of the first reinforcing members 441 may be disposed at intervals along the width direction (Y) of the end cover 40 or the length direction (X) of the end cover 40, and a portion of the first reinforcing members 441 may be bonded to another adjacent first reinforcing member 441, so as to achieve the effect of enhancing the local strength.

For example, there are six first reinforcing members 441, four of which are disposed at intervals along the length direction (X) of the end cap 40, and two other first reinforcing members 441 are respectively connected to the two first reinforcing members 441 of the middle portion so that the two first reinforcing members 441 of the middle portion have higher strength.

In this embodiment, there are at least two first reinforcing members 441 to better increase the strength of the end cap 40; at the same time, at least two first reinforcing members 441 are disposed at intervals to reduce the occupation of the first reinforcing members 441 to the inner space of the first groove 41, so that the first groove 41 accommodates the insulating member 60.

Referring to fig. 10-12, in some embodiments, the reinforcing structure 44 further includes a second reinforcement 442 disposed within the first groove 41.

The second reinforcement 442 refers to a part of the structure in the reinforcement structure 44, the second reinforcement 442 may be a bar beam structure or other structure, and the second reinforcement 442 may have a rectangular, circular, trapezoidal or other cross-sectional shape; the material of the second reinforcement 442 may include metal, plastic or other materials; the number of the second reinforcing members 442 may be one or two or more.

The direction of extension of the second stiffening member 442 and the first stiffening member 441 may be different to enable the end cap 40 to better withstand forces from different directions; for example, when the extending direction of the first reinforcement 441 is parallel to the length direction (X) of the end cover 40, the extending direction of the second reinforcement 442 may be parallel to the width direction (Y) of the end cover 40; for another example, when the extending direction of the first reinforcement 441 is parallel to the width direction (Y) of the end cover 40, the extending direction of the second reinforcement 442 may be parallel to the length direction (X) of the end cover 40.

The second reinforcement 442 can better increase the deformation resistance of the end cap 40, such as increasing the shear resistance of the end cap 40, when the end cap 40 is subjected to forces resulting from an increase in the gas pressure within the battery cell 300; the second reinforcement 442 can also cooperate with the first reinforcement 441 to better increase the torsional resistance of the end cap 40 when the end cap 40 is deformed by an external force.

The reinforcing structure 44 in this embodiment further includes a second reinforcement 442 to further increase the overall strength of the end cap 40.

Referring to fig. 12, in some embodiments, opposite ends of the second reinforcement 442 are respectively connected to adjacent sidewalls of the first groove 41.

Since the adjacent side walls of the first slot 41 are not on the same plane, the opposite ends of the second reinforcement 442 are respectively connected to the adjacent side walls of the first slot 41, even if the second reinforcement 442 is inclined with respect to the adjacent sides of the first slot 41; in the case where both ends of the first reinforcing member 441 are respectively connected to opposite side walls of the first groove 41, the provision of the second reinforcing member 442 can increase the strength of the adjacent side walls of the end cap 40 and reduce the stress concentration of the first groove 41 at the connection of the adjacent side walls.

For example, in the case where the end cap 40 is rectangular and the first groove 41 is a rectangular groove, the second reinforcing members 442 may have four corners and be provided at four corners of the first groove 41, respectively, to reinforce the strength between the adjacent end surfaces of the end cap 40.

In this embodiment, the second reinforcement 442 is connected in such a manner that two ends of the second reinforcement 442 are respectively connected to two adjacent side walls of the first groove 41, so as to enhance the strength of the two adjacent side walls of the end cover 40 and reduce the stress concentration on the end cover 40, thereby increasing the overall strength of the end cover 40.

Referring to fig. 12, in some embodiments, opposite sides of the second reinforcement 442 are connected to the sidewall of the first groove 41 and the first reinforcement 441, respectively.

The second reinforcement 442 may extend in the longitudinal direction (X) of the cap 40, may extend in the width direction (Y) of the cap 40, or may be inclined with respect to the longitudinal direction (X) of the cap 40, depending on the positional relationship of the first reinforcement 441 and the side wall of the first groove 41, which are connected to the second reinforcement 442.

For example, referring to fig. 12, the second reinforcement 442 is disposed between the first reinforcement 441 and the sidewall of the first groove 41 connected to the first reinforcement 441, where the second reinforcement 442 is inclined with respect to the first reinforcement 441 and the second reinforcement 442 is inclined with respect to the sidewall of the connected first groove 41.

The second reinforcing member 442 is disposed between the first reinforcing member 441 and the sidewall of the first slot 41 opposite to the first reinforcing member 441, and the second reinforcing member 442 may be perpendicular to the sidewall of the first slot 41.

The second reinforcement 442 can strengthen a certain sidewall of the end cap 40 when the sidewall is stressed, and can also transmit the force applied thereto to the connected first reinforcement 441 and other end cap 40 sidewalls to strengthen the overall strength of the end cap 40.

This embodiment provides some means of attachment of the second reinforcement 442 to increase the overall strength of the end cap 40; at the same time, the integrity of the first and second stiffeners 441, 442 and the end cover 40 is also improved, thereby further increasing the overall strength of the end cover 40.

Referring to fig. 11, in some embodiments, opposite ends of the second reinforcement 442 are connected to adjacent two first reinforcement 441, respectively.

In the case where the first reinforcing members 441 are disposed at intervals in the same direction, the second reinforcing member 442 may be disposed between any adjacent two of the first reinforcing members 441, and one or more second reinforcing members 442 may be disposed between the connected two of the first reinforcing members 441; the second reinforcing member 442 may be provided between each adjacent two of the first reinforcing members 441, or the second reinforcing member 442 may be provided only at the partially connected two of the first reinforcing members 441; the second reinforcing member 442 may be perpendicular to the connected first reinforcing member 441 or may be inclined with respect to the connected first reinforcing member 441.

For example, referring to fig. 11, two second reinforcing members 442 are provided between two adjacent first reinforcing members 441, and both the second reinforcing members 442 are perpendicular to the connected first reinforcing members 441.

This embodiment provides some means of attachment of the second reinforcement 442 to increase the overall strength of the end cap 40; at the same time, the integrity of the first and second stiffeners 441, 442 is also improved, further increasing the overall strength of the end cap 40.

Referring to fig. 10-12, in some embodiments, the projection of the reinforcing structure 44 onto the bottom wall of the first slot 41 does not overlap with the projection of the bottom wall of the second slot 42 onto the bottom wall of the first slot 41 in the thickness direction of the end cap 40.

The projection of the reinforcing structure 44 onto the bottom wall of the first groove 41 in the thickness direction (Z) of the end cover 40 means the coverage area of the reinforcing structure 44 onto the bottom wall of the first groove 41, and the projection of the bottom wall of the second groove 42 onto the bottom wall of the first groove 41 in the thickness direction (Z) of the end cover 40 means the coverage area of the second groove 42 onto the bottom wall of the first groove 41.

The fact that the projection of the reinforcing structure 44 does not overlap with the projection of the bottom wall of the second groove 42 means that the projection of the reinforcing structure 44 and the projection of the bottom wall of the second groove 42 are independent of each other and do not have an overlapping portion, so that the reinforcing structure 44 is not easy to cross the second groove 42, and interference of the reinforcing structure 44 on the structure of the second groove 42 for accommodating the electrode terminal 70 and the like can be reduced, so that the structure of the electrode terminal 70 and the like is better accommodated in the second groove 42.

The present embodiment can prevent the reinforcement structure 44 from crossing the second groove 42, so as to reduce interference of the reinforcement structure 44 to the second groove 42 for accommodating the electrode terminal 70, and enable the electrode terminal 70 to be better accommodated in the second groove 42, thereby better increasing the energy density of the battery cell 300.

Referring to fig. 4-7, in some embodiments, a surface of the reinforcing structure 44 facing away from the bottom wall of the first slot 41 is flush with the second surface 402, or a surface of the reinforcing structure 44 facing away from the bottom wall of the first slot 41 is located within the first slot 41.

The surface of the reinforcing structure 44 facing away from the bottom wall of the first groove 41 means the surface of the reinforcing structure 44 facing toward the inside of the battery cell 300, and the surface of the reinforcing structure 44 facing away from the bottom wall of the first groove 41 is flush with the second surface 402 so that the reinforcing structure 44 does not protrude out of the first groove 41; the surface of the reinforcing structure 44 facing away from the bottom wall of the first groove 41 is also located in the first groove 41 such that the reinforcing structure 44 does not protrude beyond the first groove 41.

The surface of the reinforcing structure 44 facing away from the bottom wall of the first groove 41 being flush with the second surface 402 can reduce the occupation of the inner space of the battery cell 300 by the reinforcing structure 44, thereby increasing the energy density of the battery cell 300; while also enabling the reinforcing structure 44 to have a greater thickness in the thickness direction (Z) of the end cap 40 so that the reinforcing structure 44 can have a higher strength, thereby facilitating a better increase in the strength of the end cap 40.

The surface of the reinforcing structure 44 facing away from the bottom wall of the first groove 41 is located in the first groove 41 to further reduce the occupation of the inner space of the battery cell 300 by the reinforcing structure 44, thereby further increasing the energy density of the battery cell 300.

The present embodiment can reduce the occurrence of the situation that the reinforcing structure 44 protrudes out of the first groove 41 in the thickness direction of the end cover 40, so as to reduce the occupation of the reinforcing structure 44 to the internal space of the battery cell 300, thereby better increasing the energy density of the battery cell 300.

Referring to fig. 4 to 8, in some embodiments, the battery cell 300 further includes an insulating member 60, at least a portion of the insulating member 60 being received in the first groove 41.

The insulating member 60 is provided with a structure of providing insulation protection in the battery cell 300, and the insulating member 60 can reduce contact conduction between the anode and the cathode of the electrode assembly 80 and the end cover 40, so as to reduce the occurrence of short circuit between the electrode assembly 80 and the end cover 40, thereby improving the safety and stability of the battery cell 300.

The insulating member 60 can also play a role in fixing and buffering, and in case that the battery cell 300 receives an external force to move or collide, the insulating member 60 can better fix the position of the electrode assembly 80 in the case 50 to reduce the movement or collision of the electrode assembly 80 in the case 50, thereby playing a role in protecting the electrode assembly 80 and the circuit.

The shape of the insulating member 60 may be rectangular, circular or other shapes, the shape of the insulating member 60 may be set according to the shape of the end cap 40 and/or the first groove 41, and the insulating member 60 may be a thin sheet structure, a plate structure or other structures having a certain thickness; the material of the insulator 60 may include plastic, asbestos, or other insulating materials.

The insulating member 60 may cover a large portion of the second surface 402, or may cover only a portion of the second surface 402 according to the distance between the electrode assembly 80 and the end cap 40.

At least part of the insulator 60 is accommodated in the first groove 41, i.e., the insulator 60 may be accommodated in the first groove 41 only partially or may be accommodated in the first groove 41 entirely.

In some embodiments, where a portion of the insulator 60 is received in the first groove 41, the thickness of the insulator 60 is greater than the depth of the first groove 41, i.e., the insulator 60 may be partially received in the first groove 41 in the thickness direction (Z) of the end cap 40, and the surface area of the insulator 60 facing the bottom wall of the first groove 41 is smaller than the area of the bottom wall of the first groove 41.

In other embodiments, where a portion of the insulator 60 is received in the first groove 41, the thickness of the insulator 60 is greater than the depth of the first groove 41, i.e., the insulator 60 may be partially received in the first groove 41 in the thickness direction (Z) of the end cap 40, and the surface area of the insulator 60 facing the bottom wall of the first groove 41 is greater than the area of the bottom wall of the first groove 41, i.e., a portion of the insulator 60 extends beyond the first groove 41 in the length direction (X) and/or width direction (Y) of the end cap 40.

In still other embodiments, where a portion of the insulator 60 is received in the first slot 41, the thickness of the insulator 60 is less than the depth of the first slot 41, i.e., the insulator 60 is received in the first slot 41 in the thickness direction (Z) of the end cap 40, and the surface area of the insulator 60 facing the bottom wall of the first slot 41 is greater than the area of the bottom wall of the first slot 41, i.e., a portion of the insulator 60 extends beyond the first slot 41 in the length direction (X) and/or width direction (Y) of the end cap 40.

In the present embodiment, the end cap 40 and the electrode terminal 70 in the battery cell 300, and the electrode assembly 80 are separated by the insulating member 60 to improve the safety and stability of the battery cell 300; at the same time, at least a portion of the insulating member 60 is received in the first groove 41 to reduce the occupation of the insulating member 60 with respect to the inner space of the battery cell 300, thereby facilitating the increase of the energy density of the battery cell 300.

Referring to fig. 13, in some embodiments, a side of the insulator 60 facing the end cap 40 is provided with a clearance groove 61, the clearance groove 61 being adapted to receive the reinforcing structure 44.

The clearance groove 61 is a structure on the insulating member 60 for matching with the reinforcing structure 44, the clearance groove 61 may be a circular groove, a square groove or a groove structure with other shape, and the shape of the clearance groove 61 may be set according to the shape of the opposite reinforcing structure 44; the depth of the clearance groove 61 may be set according to the thickness of the reinforcing structure 44, the depth of the first groove 41, and the like; the number of the avoidance grooves 61 may be one or two or more, and the specific number of the avoidance grooves 61 may be set according to the number of the reinforcing structures 44.

The clearance groove 61 is formed on the side of the insulating member 60 facing the end cover 40 and is used for accommodating the reinforcing structure 44, and since the insulating member 60 can be at least partially accommodated in the first groove 41 and the clearance groove 61 is formed on the side of the insulating member 60 facing the end cover 40 and is used for accommodating the reinforcing structure 44, the interference of the reinforcing structure 44 on the insulating member 60 accommodated in the first groove 41 can be reduced, and more part of the insulating member 60 can be accommodated in the first groove 41; for example, in the case where the insulator 60 is accommodated in the first groove 41, the side wall of the reinforcement structure 44 is in contact with the side wall of the space-avoiding groove 61, and the surface of the reinforcement structure 44 facing the inside of the battery cell 300 is in contact with the bottom wall of the space-avoiding groove 61.

In this embodiment, the spacer grooves 61 are formed on the insulating member 60 to avoid the spacer reinforcement structure 44, so as to reduce the interference of the spacer reinforcement structure 44 on the mounting of the insulating member 60 in the first groove 41, and to enable more portion of the insulating member 60 to be accommodated in the first groove 41, thereby better increasing the energy density of the battery cell 300.

Referring to fig. 3 to 6, in some embodiments, the battery cell 300 further includes an electrode terminal 70 and an electrode assembly 80 electrically connected to the electrode terminal 70; in the thickness direction of the cap 40, the electrode terminal 70 includes a first portion 71 and a second portion 72 connected, at least a portion of the first portion 71 is received in the second groove 42, and the second portion 72 penetrates the through-hole 43.

The electrode terminal 70 refers to a structure in the battery cell 300 for conducting the electrode assembly 80 and an external circuit, that is, one end of the electrode terminal 70 is electrically connected to the electrode assembly 80 and the other end of the electrode terminal 70 can be electrically connected to the external circuit; the electrode terminal 70 may be directly electrically connected to the electrode assembly 80, or may be indirectly electrically connected to the electrode assembly 80 through an adapter; the electrode terminal 70 may be cylindrical, prismatic, or other shape; the electrode terminal 70 may be made of copper, nickel, silver or other materials having conductive ability.

The electrode terminal 70 includes a first portion 71 and a second portion 72 connected, and the first portion 71 and the second portion 72 are arranged in a thickness direction (Z) of the cap 40, and the first portion 71 and the second portion 72 are sequentially arranged in the thickness direction (Z) of the cap 40 from bottom to top, as an example; the first portion 71 and the second portion 72 may be integrally formed or may be electrically connected by welding or other means.

The first portion 71 is configured to be electrically connected to the electrode assembly 80, and at least a portion of the first portion 71 is received in the second groove 42, so as to reduce the occupation of the electrode terminal 70 to the internal space of the battery cell 300, and also reduce the height difference between the surface of the first portion 71 facing the inside of the battery cell 300 and the surface of the insulating member 60 facing the inside of the battery cell 300, thereby reducing the occupation of the electrode terminal 70 to the internal space of the battery cell 300 and increasing the energy density of the battery cell 300.

The second portion 72 is for passing through the through-hole 43 and extending to the outside so that the electrode terminal 70 is electrically connected to an external circuit; it will be appreciated that the diameter of the second portion 72 is less than or equal to the inner diameter of the through-hole 43 so that the second portion 72 penetrates the through-hole 43, and the diameter of the first portion 71 may be greater than the inner diameter of the through-hole 43 to reduce the occurrence of the electrode terminal 70 coming out of the battery cell 300.

The present embodiment provides some structures of the electrode terminals 70 such that the first step of the electrode terminals 70 can be received in the second grooves 42 to reduce the occupation of the inner space of the battery cell 300 by the first step, thereby increasing the energy density of the battery cell 300.

Referring to fig. 3-6, in some embodiments, the end cap 40 further includes a third groove 45 open to the first surface 401, the third groove 45 in communication with the through hole 43;

The electrode terminal 70 further includes a third portion 73, the third portion 73 being connected to an end of the second portion 72 opposite to the first portion 71;

the battery cell 300 further includes a fixing member 90 coupled to the third portion 73, and at least a portion of the fixing member 90 is received in the third groove 45.

The third portion 73 is one end of the electrode terminal 70 connected to an external circuit, and the third portion 73 extends outside the battery cell 300; the third portion 73 is connected to a side of the second portion 72 opposite to the first portion 71, that is, the first portion 71, the second portion 72, and the third portion 73 are sequentially arranged from bottom to top along the thickness direction (Z) of the end cover 40; the first portion 71, the second portion 72, and the third portion 73 may be integrally formed, or may be electrically connected by welding or other means.

The fixing member 90 is mainly used for fixing the electrode terminal 70 in the battery cell 300, and the fixing member 90 is connected to the third portion 73, so that the third portion 73 is not easy to enter the through hole 43, thereby improving the stability of connection between the electrode terminal 70 and an external circuit, and reducing the damage to the electrode assembly 80 or other structures caused by the entering of the electrode terminal 70 into the battery cell 300.

The shape of the fixing member 90 may be cylindrical, prismatic, or other shape; the material of the fixing member 90 may include metal, plastic or other materials; the fixing member 90 may be fitted around the third portion 73, or may be provided on one side of the third portion 73; the fixing member 90 may be detachably connected to the third portion 73 by means of a snap fit or the like, or may be fixedly connected to the third portion 73 by means of an adhesive, welding or the like.

The third groove 45 is a groove structure formed on the first surface 401, and when the end cap 40 is covered on the case 50, the third groove 45 is a groove structure which is opened toward the outside of the battery cell 300 and is recessed toward the inside of the end cap 40; the first groove 41 may be a circular groove, a square groove, or other shaped groove structure.

The third groove 45 is mainly used for accommodating the fixing member 90 to reduce the height of the fixing member 90 protruding from the first surface 401, thereby reducing the occupation of the fixing member 90 to the inner space of the case 30 and increasing the energy density of the battery 200.

Depending on the thickness of the end cap 40, the thickness of the fixing member 90, the thickness of the third portion 73, etc., the third groove 45 may receive only a portion of the fixing member 90 or may completely receive the fixing member 90.

The third groove 45 may cover a small portion of the first surface 401 or may cover a large portion of the first surface 401; illustratively, the third groove 45 covers only a small portion of the first surface 401 and is compatible with the fixture 90 to reduce the impact of the third groove 45 on the strength of the end cap 40.

Since the second groove 42 and the third groove 45 are used for part of the electrode terminal 70, the second groove 42, the through hole 43 and the third groove 45 are sequentially arranged along the thickness direction (Z) of the end cover 40 from bottom to top, and at this time, the position where the thickness of the end cover 40 is the smallest is the position where the end cover 40 is opposite to the second groove 42 and the third groove 45.

The present embodiment provides a structure of some electrode terminals 70 such that the fixing member 90 is connected to the third portion 73 of the electrode terminal 70, and thereby fixes the electrode terminal 70 to the cap 40; the third groove 45 is provided on the first surface 401, and at least a portion of the fixing member 90 is received through the third groove 45 to reduce the height of the fixing member 90 protruding from the first surface 401 and to reduce the height difference between the electrode terminal 70 and the first surface 401, thereby enabling the bus bar to be more stably welded to the electrode terminal 70.

In some embodiments, the end cap 40 includes a first surface 401 and a second surface 402 opposite to each other along a thickness direction (Z), the first surface 401 is a plane, the second surface 402 is provided with a first groove 41, a bottom wall of the first groove 41 is provided with a second groove 42, and a bottom wall of the second groove 42 is provided with a through hole 43 penetrating the end cap 40; the second surface 402 is provided with a third groove 45, and the third groove 45 communicates with the through hole 43.

The end cover 40 is also provided with a first reinforcing member 441 and a second reinforcing member 442 which are accommodated in the first groove 41, the first reinforcing member 441 is four and is arranged at intervals along the length direction (X) of the end cover 40, and two ends of the first reinforcing member 441 are respectively connected with two side walls of the first groove 41 which are oppositely arranged along the width direction (Y) of the end cover 40; the second reinforcing members 442 have a plurality of second reinforcing members 442, wherein two ends of a part of the second reinforcing members 442 are respectively connected to two adjacent side walls of the first slot 41, two ends of another part of the second reinforcing members 442 are respectively connected to two adjacent first reinforcing members 441, and two ends of the remaining second reinforcing members 442 are respectively connected to the first reinforcing members 441 and the side walls of the first slot 41 connected to the first reinforcing members 441.

The surfaces of the first and second reinforcing members 441 and 442 facing the inside of the battery cell 300 are flush with the second surface 402.

The battery cell 300 further includes an insulating member 60, a plurality of avoidance grooves 61 are formed on a side of the insulating member 60 facing the end cover 40, and a portion of the insulating member 60 can be received in the first groove 41, so that the first reinforcing member 441 and the second reinforcing member 442 can be respectively received in the opposite avoidance grooves 61.

The battery cell 300 further includes an electrode terminal 70, a portion of the first portion 71 of the electrode terminal 70 is received in the second groove 42, the second portion 72 of the electrode terminal 70 penetrates the through-hole 43, and the third portion 73 of the electrode terminal 70 extends outside the motor cell.

The battery cell 300 further includes a fixing member 90, the fixing member 90 is coupled to the third portion 73, and a portion of the fixing member 90 is received in the third groove 45.

In a second aspect, some embodiments of the present application also provide an end cap 40 including a first surface 401 and a second surface 402 disposed opposite in a thickness direction (Z) thereof. The first surface 401 is a plane to reduce interference to the structural arrangement of the bus bar, the wire harness, and the like, and the second surface 402 is provided with a first groove 41 to increase or decrease the internal space of the battery cell 300, thereby increasing the energy density of the battery cell 300.

In a third aspect, some embodiments of the present application also provide a battery 200, including the battery cell 300 provided by some embodiments of the first aspect.

The battery 200 includes a case 30 and a battery cell 300, and the battery cell 300 is accommodated in the case 30. The battery cell 300 may be a square battery cell or a cylindrical battery cell; the number of the battery cells 300 may be plural, and the plurality of battery cells 300 may be connected in series, parallel, or series-parallel.

Two ends of the bus bar can be respectively connected to the electrode terminals 70 of two adjacent battery monomers 300, and the bus bar does not need to be specially-shaped because the first surface 401 of the end cover 40 of each battery monomer 300 is a plane, so that the design and the production cost of the bus bar are reduced, the occupation of the internal space of the battery 200 is reduced, and the energy density of the battery 200 is increased; while the wiring harness in the battery 200 can be more easily routed.

In a fourth aspect, some embodiments of the present application also provide an electrical device 100, including a battery 200 provided by some embodiments of the third aspect.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. A battery cell, comprising:

The end cover in the thickness direction of the end cover, the end cover comprises a first surface and a second surface which are oppositely arranged, the first surface is a plane, a first groove is formed in the second surface, and the first groove is used for accommodating at least part of components inside the battery cell.

2. The battery cell of claim 1, wherein the end cap is provided with a second slot opening into the bottom wall of the first slot.

3. The battery cell of claim 2, wherein a projected area of the bottom wall of the first groove on the second surface is larger than a projected area of the bottom wall of the second groove on the second surface in a thickness direction of the end cap.

4. The battery cell of claim 1, wherein the depth of the first groove is greater than 0 and the depth of the first groove is less than or equal to 2mm in the thickness direction of the end cap.

5. The battery cell of claim 2, wherein the depth of the second groove is greater than 0 and the depth of the second groove is less than or equal to 2mm in the thickness direction of the end cap.

6. The battery cell of claim 2, wherein the thickness of the end cap at the minimum thickness is greater than or equal to 1.2mm in the thickness direction of the end cap.

7. The battery cell as recited in claim 3, wherein the end cap is provided with a through hole, the through hole penetrates through the end cap along a thickness direction of the end cap, and the through hole is communicated with the first groove and the second groove.

8. The battery cell of claim 2 or 3, wherein the end cap further comprises a reinforcing structure disposed within the first groove.

9. The battery cell of claim 8, wherein the reinforcement structure comprises a first reinforcement member having opposite ends respectively connected to opposite sidewalls of the first groove.

10. The battery cell of claim 9, wherein the first reinforcement members are at least two, and wherein the at least two first reinforcement members are disposed at intervals along the width or length direction of the end cap.

11. The battery cell of claim 9, wherein the reinforcement structure further comprises a second reinforcement disposed within the first groove.

12. The battery cell of claim 11, wherein opposite ends of the second reinforcement are connected to adjacent side walls of the first groove, respectively.

13. The battery cell of claim 11, wherein opposite sides of the second reinforcement are connected to the sidewall of the first channel and the first reinforcement, respectively.

14. The battery cell of claim 11, wherein opposite ends of the second reinforcement member are connected to adjacent ones of the first reinforcement members, respectively.

15. The battery cell of claim 8, wherein a projection of the reinforcing structure to the bottom wall of the first slot and a projection of the bottom wall of the second slot to the bottom wall of the first slot do not overlap in a thickness direction of the end cap.

16. The battery cell of claim 8, wherein a surface of the reinforcing structure facing away from the bottom wall of the first groove is flush with the second surface; or (b)

The surface of the reinforcing structure facing away from the bottom wall of the first groove is located within the first groove.

17. The battery cell of claim 8, further comprising an insulator, at least a portion of the insulator being received within the first slot.

18. The battery cell of claim 17, wherein a side of the insulator facing the end cap is formed with a clearance groove for receiving the reinforcement structure.

19. The battery cell of claim 7, further comprising an electrode terminal and an electrode assembly electrically connected to the electrode terminal;

In the thickness direction of the end cap, the electrode terminal includes a first portion and a second portion connected, at least a portion of the first portion is received in the second groove, and the second portion penetrates the through hole.

20. The battery cell of claim 19, wherein the end cap further comprises a third groove open to the first surface, the third groove in communication with the through hole;

The battery cell also includes a securing member coupled to the third portion, at least a portion of the securing member being received in the third slot.

21. The end cover is characterized by comprising a first surface and a second surface which are oppositely arranged in the thickness direction of the end cover, wherein the first surface is a plane, and a first groove is formed in the second surface.

22. A battery comprising a cell according to any one of claims 1-20.

23. An electrical device comprising the battery of claim 22.