CN218448168U

CN218448168U - End cover assembly, battery monomer, battery and power consumption device

Info

Publication number: CN218448168U
Application number: CN202222392964.8U
Authority: CN
Inventors: 雷育永; 郭志君; 李川; 严涵; 陈龙
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-09-08
Filing date: 2022-09-08
Publication date: 2023-02-03
Anticipated expiration: 2032-09-08

Abstract

The embodiment of the application provides an end cover assembly, a single battery, a battery and an electric device, wherein the end cover assembly (10) comprises a first cover plate (1), a second cover plate (2) and an anti-rotation device (9), the first cover plate (1) is used for sealing a first shell (20), the second cover plate (2) is used for sealing a second shell (30), the second cover plate (2) and the first cover plate (1) are arranged oppositely along a first direction, and the anti-rotation device (4) is configured to prevent relative rotation between the first cover plate (1) and the second cover plate (2). The cell includes an end cap assembly (10).

Description

End cover assembly, battery monomer, battery and power consumption device

Technical Field

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

Background

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

During the use process of the battery, the relative stability among some components is related to the overall quality of the battery; in particular, for some assembled battery cells, the housing is generally formed by connecting at least two housing bodies together at their ends, and two adjacent housing bodies are connected together by an end cap having an integrated structure. The relative stability relationship between these components directly affects the structural stability of the battery cell.

SUMMERY OF THE UTILITY MODEL

The application provides an end cover assembly, battery monomer, battery and power consumption device can keep the relative stability between first apron and the second apron, improves the free structural stability of battery.

In a first aspect, the present application provides an end cap assembly, including a first cover plate for closing a first housing, a second cover plate for closing a second housing, and an anti-rotation device, the second cover plate being disposed opposite to the first cover plate along a first direction; the anti-rotation device is configured to prevent relative rotation between the first cover plate and the second cover plate.

In this embodiment, through set up anti-rotation device between first apron and second apron, can prevent to take place relative rotation between first apron and the second apron, keep the relative stability between first apron and the second apron, and then improve the free antitorque commentaries on classics ability of end cover subassembly and whole battery, improve the free structural stability of battery.

In some embodiments, the end cap assembly further comprises a first insulator disposed between the first and second cover plates to insulate the first and second cover plates.

Through setting up first insulating part, can make and realize insulating between first apron and the second apron, and then can make first casing that first apron was sealed and second casing that the second apron was sealed mutually insulating, and can not switch on each other through first apron and second apron.

In some embodiments, the rotation prevention device includes a connection post, the first cover plate is provided with a first through hole, the second cover plate is provided with a second through hole, one end of the connection post passes through the first through hole and is used for electrically connecting a first electrode assembly in the first housing, the second through hole at the other end of the connection post is used for electrically connecting a second electrode assembly in the second housing, and the connection post is non-rotatably matched with the first through hole and the second through hole respectively.

In this embodiment, the connection posts are members for electrically connecting the first electrode assembly and the second electrode assembly, i.e., electrode terminals, and the series connection of the first electrode assembly and the second electrode assembly can be achieved; in the embodiment, the connecting column is structurally modified, and the connecting column and the first through hole are in non-rotation fit, so that the connecting column and the first cover plate can be prevented from rotating relatively; through setting up to non-normal running fit between spliced pole and the second through-hole, can prevent that spliced pole and second apron from taking place relative rotation, and then prevent the relative rotation between first apron and the second apron, consequently need not increase new part for preventing the relative rotation between first apron and the second apron, be favorable to alleviateing the free total weight of battery, reduce the free total volume of battery, can also practice thrift the cost.

In some embodiments, the portion of the connection column passing through the first through hole and the portion of the connection column passing through the second through hole are respectively square structures, and the first through hole and the second through hole are respectively square holes which are in non-rotation fit with the corresponding square structures. The connecting column can be prevented from rotating in the first through hole and the second through hole by the aid of the arrangement, the purpose that the connecting column is limited to rotate relative to the first through hole and the second through hole can be achieved, the connecting column is prevented from rotating relative to the first cover plate and the second cover plate, the connecting column is integrated with the structures matched with the first cover plate and the second cover plate in a non-rotating mode, the square hole and the square structure are simple in machining process, too much structural change is not needed to be made on the end cover assembly, and design cost is low.

In some embodiments, the anti-rotation device includes a first adhesive structure and a second adhesive structure, the first insulator is fixedly adhered to the first cover plate through the first adhesive structure, and the first insulator is fixedly adhered to the second cover plate through the second adhesive structure.

Through the arrangement of the first bonding structure, bonding connection between the first insulating part and the first cover plate can be realized, so that the relative fixation between the first insulating part and the first cover plate is kept, and the first insulating part is prevented from rotating relative to the first cover plate; through setting up second adhesive structure, can make and realize adhesive connection between first insulating part and the second apron to keep the relatively fixed of first insulating part and second apron, prevent that first insulating part from taking place to rotate for the second apron, and then realize the relatively stable between first apron and the second apron, prevent that first apron and second apron from taking place to rotate relatively, simple structure is convenient for realize.

In some embodiments, the first cover plate and the first insulating member are both provided with a first enclosing structure on the periphery of one of the first cover plate and the first insulating member, and the side wall of the other one of the first cover plate and the first insulating member abuts against the side wall of the first enclosing structure so as to limit the relative rotation of the first cover plate and the first insulating member;

in the second cover plate and the first insulating piece, a second enclosing structure is annularly arranged on the peripheral edge of one of the second cover plate and the first insulating piece, and the side wall of the other one of the second cover plate and the first insulating piece is abutted against the side wall of the second enclosing structure so as to limit the relative rotation of the second cover plate and the first insulating piece.

Through setting up first fender structure, can restrict the rotation of first insulating part relative to first apron. Enclose through setting up the second and keep off the structure, can restrict the rotation of first insulating part for the second apron, and then prevent to take place relative rotation between first apron and the second apron, keep the relative stability between first apron and the second apron, and then improve end cover subassembly and the free antitorque commentaries on classics ability of whole battery, improve the free structural stability of battery.

In some embodiments, the rotation prevention device includes a first rotation prevention portion disposed between the first insulating member and the first cover plate and configured to prevent relative rotation of the first insulating member and the first cover plate, and a second rotation prevention portion disposed between the first insulating member and the second cover plate and configured to prevent relative rotation of the first insulating member and the second cover plate.

In this embodiment, the first rotation preventing portion provided between the first insulating member and the first cover plate can prevent relative rotation between the first insulating member and the first cover plate. The second rotation prevention part is arranged between the first insulating part and the second cover plate and can prevent the first insulating part and the second cover plate from rotating relatively. Between first insulating part and first apron and between first insulating part and the second apron respectively through first portion of preventing changeing and the second of preventing change the restriction relative rotation back, antitorque commentaries on classics ability between first apron and the second apron has also obtained the improvement, first casing with first cover connection and the antitorque commentaries on classics ability between the second casing with second cover connection have also obtained the improvement, thereby correspond the assembly by this end cover assembly's battery monomer, can keep the relative stability between first apron and the second apron, can effectively improve whole battery monomer's antitorque commentaries on classics ability, improve the free structural stability of battery.

In some embodiments, a first groove is formed on one of the first cover plate and the first insulating member, a first rotation preventing portion is formed on the other of the first cover plate and the first insulating member, and the first rotation preventing portion is embedded in the first groove;

and a second groove is arranged on one of the second cover plate and the first insulating piece, a second anti-rotation part is arranged on the other one of the second cover plate and the first insulating piece, and the second anti-rotation part is embedded into the second groove.

In this embodiment, one of the first cover plate and the first insulating member is provided with a first rotation preventing portion, the other is provided with a corresponding first groove, one of the first insulating member and the second cover plate is provided with a second rotation preventing portion, and the other is provided with a corresponding second groove.

In some embodiments, a projection of the first groove and a projection of the second rotation preventing portion are offset from each other on a plane perpendicular to the embedding direction of the first rotation preventing portion.

In this embodiment, the projection of the first groove and the projection of the second rotation preventing portion are staggered with each other, so that the matching structure of the first rotation preventing portion and the first groove and the matching structure of the second rotation preventing portion and the second groove can be dispersed at different positions, thereby increasing the coverage of the rotation preventing device and improving the rotation preventing effect.

In some embodiments, a projection of the first groove on a plane perpendicular to the embedding direction of the first rotation preventing part falls within a projection range of the second rotation preventing part.

In this embodiment, the projection of first recess falls into the projection scope of second rotation prevention portion, and first recess sets up under the protruding position of second rotation prevention portion promptly, and the concave position of first recess and the protruding position of second rotation prevention portion are just in time relative, like this alright form two concave-convex cooperation structures nested each other between first apron, first insulating part and second apron to effectively strengthen anti-rotation device's bulk strength, improve anti-rotation effect.

In some embodiments, the first groove is disposed on the first insulating member, the second groove is disposed on the second cover plate, and the first rotation preventing portion at least partially extends into the second groove in the embedding direction of the first rotation preventing portion.

In this embodiment, at least part of the first anti-rotation portion can extend into the second recess, i.e. the depth of the first recess is greater than the thickness of the first insulating member, so that part of the second recess falls into the first recess, the second anti-rotation portion being located between the wall of the first recess and the wall of the second recess. The advantage of setting up like this can make also can partly get into the second recess with first recess complex first portion of preventing changeing for the torsional force that first apron received can prevent changeing the portion through the second on the first insulating part through first portion of preventing changeing and directly transmit to the second apron, thereby reduces the intensity requirement to first insulating part, allows the thickness of first insulating part to suitably reduce.

In some embodiments, in the embedding direction of the first rotation preventing portion, a protruding dimension of a portion of the first rotation preventing portion protruding into the second groove is greater than or equal to 0.2mm.

In the embodiment, the extending size of the part of the first anti-rotation part extending into the second groove is larger than or equal to 0.2mm, namely the difference between the depth of the first groove and the thickness of the first insulating part is larger than or equal to 0.2mm, so that the torsion force borne by the first cover plate can be directly transmitted to the second cover plate through the first anti-rotation part, and the force transmission and anti-rotation effects are improved.

In a second aspect, the present application provides a battery cell including the above-described end cap assembly.

In a third aspect, the present application provides a battery, which includes a box body and the above battery cell, wherein the battery cell is disposed in the box body, and the battery cell is used for providing electric energy.

In a fourth aspect, the present application provides an electric device, including the above battery cell, where the battery cell is used to supply electric energy to the electric device; alternatively, the battery is included for supplying electric energy to the electric device.

The above description is only an overview of the technical solutions of the present application, and the present application may be implemented in accordance with the content of the description so as to make the technical means of the present application more clearly understood, and the detailed description of the present application will be given below in order to make the above and other objects, features, and advantages of the present application more clearly understood.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

FIG. 1 is a schematic structural diagram of some embodiments of a powered device disclosed herein;

fig. 2 is a schematic structural view of some embodiments of the batteries disclosed herein;

fig. 3 is an exploded view of some embodiments of a battery cell disclosed herein;

fig. 4 is a schematic structural view of some embodiments of a battery cell disclosed herein;

FIG. 5 is an exploded view of some embodiments of the end cap assembly disclosed herein;

FIG. 6 is a top view of some embodiments of the end cap assembly disclosed herein after assembly;

FIG. 7 isbase:Sub>A cross-sectional view taken along section A-A of FIG. 6;

FIG. 8 is an internal cross-sectional view of some embodiments of the end cap assembly disclosed herein;

FIG. 9 is an exploded view of other embodiments of the end cap assembly disclosed herein;

FIG. 10 is a top view of other embodiments of the end cap assembly disclosed herein after assembly;

FIG. 11 is a cross-sectional view taken along section B-B of FIG. 10;

FIG. 12 is an exploded view of still further embodiments of the end cap assembly disclosed herein;

fig. 13 is a side view of some embodiments of a battery cell as disclosed herein;

FIG. 14 is a cross-sectional view taken along section C-C of FIG. 13;

FIG. 15 is an exploded view of the end cap assembly of the embodiment of FIGS. 13 and 14;

FIG. 16 is a top view of the end cap assembly of the embodiment of FIGS. 13 and 14;

FIG. 17 is a cross-sectional view taken along section D-D of FIG. 16;

fig. 18 is a partial enlarged view at E in fig. 17;

FIG. 19 is an exploded view of still other embodiments of the end cap assembly disclosed herein;

FIG. 20 is a top view of still other embodiments of the end cap assembly disclosed herein;

fig. 21 is a sectional view taken along section F-F in fig. 12.

In the drawings, the drawings are not necessarily to scale.

Description of the labeling:

1000. a vehicle; 100. a battery; 200. an axle; 300. a wheel; 400. a motor; 500. a controller;

101. a battery cell; 102. a box body; 102a, a box body; 102b, a cover body;

10. an end cap assembly; 20. a first housing; 30. a second housing; 40. a first electrode assembly; 40a, a first tab; 50. a second electrode assembly; 50a, a second tab; 60. a first end cap assembly; 70. a second end cap assembly;

1. a first cover plate; 1a, a first bonding structure; 11. a first through hole; 12. a first enclosure; 13. a second boss portion; 2. a second cover plate; 2a, a second bonding structure; 21. a second through hole; 22. a fourth boss; 23. a third enclosure; 3. a first insulating member; 31. a third through hole; 32. a first boss; 33. a fourth enclosure; 34. a third boss portion; 35. a second enclosure; 4. a first conductive member; 41. connecting columns; 42. a limiting part; 5. a second conductive member; 51. a fourth via hole; 6. a second insulating member; 61. a fifth through hole; 7. a third insulating member; 71. a sixth through hole; 81. a first seal member; 82. a second seal member; 9. an anti-rotation device; 91. a first rotation prevention unit; 92. a first groove; 93. a second rotation prevention unit; 94. a second groove.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

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 "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or to implicitly indicate the number, specific order, or primary-secondary relationship of the technical features indicated. Further, the term "vertical" is not strictly vertical but is within an error allowance. "parallel" is not strictly parallel but within the tolerance of the error.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

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

In the description of the embodiments of the present application, the term "plurality" refers to two or more, unless explicitly defined otherwise. Similarly, "a plurality of sets" refers to two or more sets, and "a plurality" refers to two or more pieces, unless otherwise specifically limited.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, and are used for convenience in describing the embodiments of the present application and for simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of power batteries is more and more extensive from the development of market conditions. 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 and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The present inventors have noted that, as the application range of power batteries is expanding, the demand of various electric devices for battery capacity is increasing. In order to increase the capacity of the battery as much as possible in a limited storage space, the battery cell is initially configured to include two electrode assemblies connected in series, so that a part of the intermediate electrical connection member can be saved, and a part of the space can be saved for the battery, thereby providing support for increasing the capacity of the battery.

Because the length of the battery cell is longer than that of the battery cell comprising one electrode assembly due to the inclusion of the two electrode assemblies, the two electrode assemblies may be twisted relatively due to lateral shear force applied to the battery cell during use, so that the leakage of the electrode assemblies is caused, and the like, and the overall quality and the use safety of the battery cell are affected.

The inventor finds through research that an anti-rotation device can be arranged between the first cover plate and the second cover plate to prevent relative torsion between the first cover plate and the second cover plate, so that the torsion resistance of the end cover assembly and the whole battery cell is improved, and leakage of the electrode assembly is avoided to cause safety accidents.

The end cover assembly disclosed by the embodiment of the application is suitable for a battery monomer, a battery and an electric device using the battery.

The power consumption device may be a mobile phone, a portable device, a notebook computer, a battery car, an electric vehicle, a ship, a spacecraft, an electric toy, an electric tool, and the like, for example, the spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, and the like, the electric toy includes a stationary or mobile electric toy, for example, a game machine, an electric vehicle toy, an electric ship toy, an electric airplane toy, and the like, the electric tool includes a metal cutting electric tool, an abrasive electric tool, an assembly electric tool, and an electric tool for railways, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an electric drill impact, a concrete vibrator, and an electric planer.

As shown in fig. 1, the electric device may be a vehicle 1000, such as a new energy vehicle, where the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or a range-extended vehicle; or the electric device can be an unmanned aerial vehicle or a ship and the like. Specifically, the vehicle 1000 may include a battery 100, an axle 200, wheels 300 connected to the axle 200, a motor 400, and a controller 500, wherein the controller 500 is configured to control the motor 400 to operate, the motor 400 is configured to drive the axle 200 to rotate, the axle 200 rotates to drive the wheels 300 to rotate, and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 to provide electric power for the operation of the motor 400 and other components in the vehicle.

As shown in fig. 2, the battery 100 includes a battery cell 101 and a case 102. In the battery 100, one or more battery cells 101 may be provided. If there are a plurality of battery cells 101, the plurality of battery cells 101 may be connected in series, in parallel, or in series-parallel, where the series-parallel refers to that the plurality of battery cells 101 are connected in series or in parallel, or the plurality of battery cells 101 may be connected in series, in parallel, or in series-parallel to form a battery module, and the plurality of battery modules are connected in series, in parallel, or in series-parallel to form a whole, and are accommodated in the box 102. Or all the battery cells 101 may be directly connected in series or in parallel or in series-parallel, and the whole of all the battery cells 101 is accommodated in the case 102.

The case 102 has a hollow structure inside, and for example, the case 102 may include a case body 102a and a cover 102b. The case body 102a and the cover 102b are fastened together. For example, the box body 102a and the cover 102b may be hollow cuboids, only one surface of each of the box body 102a and the cover 102b is an opening surface, the opening of the box body 102a and the opening of the cover 102b are oppositely arranged, and the box body 102a and the cover 102b are buckled with each other to form a box body with a closed cavity. The case body 102a may be a rectangular parallelepiped having an opening and the lid 102b may be plate-shaped, or the lid 102b may be a rectangular parallelepiped having an opening and the case body 102a may be plate-shaped, and the case body 102a and the lid 102b may be disposed opposite to each other and fastened to form the case 102 having a closed chamber. At least one battery cell 101 is connected in parallel or in series-parallel combination, and then placed in a closed cavity formed by buckling the box body 102a and the cover body 102b.

The battery cell 101 includes a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the present disclosure. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc., which is not limited in the embodiments of the present disclosure. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery cell, the square battery cell and the soft package battery cell are also not limited in the embodiment of the disclosure.

In order to clearly understand the improved principle of the battery cell of the present application, the structure of the terminal assembly will be first described in detail.

In some embodiments, as shown in fig. 3 and 4, the battery cell includes an end cap assembly 10, a first case 20, a second case 30, a first electrode assembly 40, a second electrode assembly 50, a first end cap assembly 60, and a second end cap assembly 70.

The first case 20 and the second case 30 each have an opening, the first electrode assembly 40 is accommodated inside the first case 20, and the second electrode assembly 50 is accommodated inside the second case 30.

The opening of the first housing 20 and the opening of the second housing 30 are disposed opposite to each other, and the end cap assembly 10 is disposed between the first housing 20 and the second housing 30. The first and second

end cap assemblies

60 and 70 are disposed at ends of the first and

second cases

20 and 30, respectively, which are distant from the openings of each other.

The first case 20 and the second case 30 are filled with an electrolyte, respectively. The first electrode assembly 40 and the second electrode assembly 50 may each be formed by laminating or winding first and second pole pieces of opposite polarity, and a separator is typically provided between the first and second pole pieces. The coated portions of the first and second pole pieces constitute main portions of the first and

second electrode assemblies

40 and 50, and the uncoated portions of the first and second pole pieces each constitute two kinds of pole tabs having opposite polarities.

The first and

second housings

20 and 30 may be various shapes and various sizes, such as a rectangular parallelepiped shape, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shapes of the first and

second cases

20 and 30 may be determined according to the specific shapes and sizes of the first and

second electrode assemblies

40 and 50. The material of the first casing 20 and the second casing 30 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present invention is not limited thereto.

Referring to fig. 5, in some embodiments of the present application, the cap assembly 10 includes a first cap plate 1, a second cap plate 2, and an anti-rotation device 9, the first cap plate 1 is used to close a first case 20, the first case 20 is used to accommodate a first electrode assembly 40, the second cap plate 2 is used to close a second case 30, the second case 30 is used to accommodate a second electrode assembly 50, the second cap plate 2 is disposed opposite to the first cap plate 1 along a first direction for arranging the first case 20 and the second case 30 along the first direction, and the anti-rotation device 9 is configured to prevent relative rotation between the first cap plate 1 and the second cap plate.

Wherein the first direction is a direction perpendicular to the first cover plate 1 and the second cover plate 2.

In this embodiment, through set up rotational lock 9 between first apron 1 and second apron 2, can prevent to take place relative rotation between first apron 1 and the second apron 2, keep the relative stability between first apron 1 and the second apron 2, and then improve the free antitorque commentaries on classics ability of end cover subassembly and whole battery, improve the free structural stability of battery.

Through setting up rotational lock 9, can also prevent to take place relative rotation and influence the leakproofness of first casing 20 and second casing 30 because of first apron 1 and second apron 2, avoid electrode subassembly to take place the weeping, cause the incident.

As shown in fig. 5, in some embodiments, the end cap assembly further comprises a first insulator 3 disposed between the first and

second cover plates

1 and 2 to insulate the first and

second cover plates

1 and 2.

Through setting up first insulator 3, can make and realize insulating between first apron 1 and the second apron 2, and then can make first casing 20 that first apron 1 closed and second casing 30 that second apron 2 closed insulate from each other, and can not switch on each other through first apron 1 and second apron 2.

In some embodiments, the rotation prevention device 9 includes a connection post 41, the first cover plate 1 is provided with a first through hole 11, the second cover plate 2 is provided with a second through hole 21, one end of the connection post 41 passes through the first through hole 11 and is used for electrically connecting the first electrode assembly 40 in the first casing 20, the second through hole 21 at the other end of the connection post 41 is used for electrically connecting the second electrode assembly 50 in the second casing 30, and the connection post 41 is non-rotatably matched with the first through hole 11 and the second through hole 21 respectively.

In this embodiment, the connection post 41 is a part that electrically connects the first electrode assembly 40 and the second electrode assembly 50, i.e., an electrode terminal, and the series connection of the first electrode assembly 40 and the second electrode assembly 50 can be achieved; in the embodiment, the connecting column 41 is structurally modified, and the connecting column 41 and the first through hole 11 are in non-rotation fit, so that the connecting column 41 and the first cover plate 1 can be prevented from rotating relatively; through set up to non-normal running fit between spliced pole 41 and the second through-hole 21, can prevent that spliced pole 41 and second apron 2 from taking place relative rotation, and then realize preventing the relative pivoted purpose between first apron 1 and the second apron 2, consequently need not increase new part for preventing the relative rotation between first apron 1 and the second apron 2, be favorable to alleviateing the free total weight of battery, reduce the free total volume of battery, can also practice thrift the cost.

The specific implementation of setting up as non-running fit between spliced pole 41 and the first through-hole 11 and setting up as non-running fit between spliced pole 41 and the second through-hole 21 has multiple choices, for example can be with spliced pole 41 and the pore wall adhesive bonding of first through-hole 11, with spliced pole 41 and the pore wall adhesive bonding of second through-hole 21 etc..

In some embodiments, the portion of the connection column 41 passing through the first through hole 11 and the portion of the connection column 41 passing through the second through hole 21 are respectively square structures, and the first through hole 11 and the second through hole 21 are respectively square holes non-rotatably matched with the corresponding square structures.

In the embodiment shown in fig. 5 to 7, the connection column 41 is a square structure, and the first through hole 11 and the second through hole 21 are square holes, so that the connection column 41 can be prevented from rotating in the first through hole 11 and the second through hole 21, that is, the purpose of limiting the rotation of the connection column 41 relative to the first through hole 11 and the second through hole 21 can be achieved, and therefore the connection column 41 is prevented from rotating relative to the first cover plate 1 and the second cover plate 2, the connection column 41 integrates a structure which is in non-rotation fit with the first cover plate 1 and the second cover plate 2, the square holes and the square structures are simple in processing technology, excessive structural changes of the end cover assembly are not needed, and the design cost is low.

In other embodiments, the connecting column 41 may also be a triangular prism, and the first through hole 11 and the second through hole 21 are both triangular holes; alternatively, the connecting column 41 is a pentagonal prism, and both the first through hole 11 and the second through hole 21 are pentagonal holes, and the like.

As shown in fig. 8, in some embodiments, the anti-rotation device 9 includes a first adhesive structure 1a and a second adhesive structure 2a, the first insulator 3 is fixedly adhered to the first cover plate 1 through the first adhesive structure 1a, and the first insulator 3 is fixedly adhered to the second cover plate 2 through the second adhesive structure 2 a.

By arranging the first bonding structure 1a, bonding connection between the first insulating member 3 and the first cover plate 1 can be realized, so that the first insulating member 3 and the first cover plate 1 are kept relatively fixed, and the first insulating member 3 is prevented from rotating relative to the first cover plate 1; through setting up second adhesive structure 2a, can make and realize adhesive connection between first insulator 3 and the second apron 2 to keep first insulator 3 and the relative fixed of second apron 2, prevent that first insulator 3 from taking place to rotate for second apron 2, and then realize the relative stability between first apron 1 and the second apron 2, prevent that first apron 1 and second apron 2 from taking place to rotate relatively, simple structure, the realization of being convenient for.

The first bonding structure 1a and the second bonding structure 2a may use an adhesive or the like.

As shown in fig. 9 to 12, in some embodiments, the first cover plate 1 and the first insulating member 3 are both provided with a first surrounding structure on the periphery of one of them, and the side wall of the other abuts against the side wall of the first surrounding structure, so as to limit the relative rotation between the first cover plate 1 and the first insulating member 3;

in the second apron 2 and the first insulating part 3 two, the edge of the periphery of one of them is surrounded and is equipped with the second and encloses the fender structure, and the lateral wall of the other one supports and leans on in the lateral wall that encloses the fender structure to the relative rotation of restriction second apron 2 and first insulating part 3.

By providing the first enclosure structure, the first insulating member 3 can be restricted from rotating relative to the first cover plate 1. Through setting up the second and enclosing the fender structure, can restrict first insulating part 3 and for the rotation of second apron 2, and then prevent to take place relative rotation between first apron 1 and the second apron 2, keep the relative stability between first apron 1 and the second apron 2, and then improve end cover subassembly and whole free antitorque commentaries on classics ability of battery, improve the free structural stability of battery.

In some embodiments, the first enclosure structure comprises a first enclosure 12 and a second enclosure 35. The first enclosure 12 is arranged at the edge of the first cover plate 1 along the circumferential direction of the first cover plate 1, and the first insulating member 3 is at least partially accommodated in a concave part formed by combining the first enclosure 12 and the first cover plate 1 so as to limit the relative rotation of the first cover plate 1 and the first insulating member 3; the second enclosure 35 is disposed at the edge of the first insulating member 3 along the circumferential direction of the first insulating member 3, and the first cover plate 1 is at least partially accommodated in a recess formed by the combination of the second enclosure 35 and the first insulating member 3 to limit the relative rotation between the first cover plate 1 and the first insulating member 3

As shown in fig. 9 to 11, the first surrounding barrier 12 is disposed at an edge of the first cover plate 1 along a circumferential direction of the first cover plate 1 and extends from the first cover plate 1 to a direction close to the first insulating member 3, the first surrounding barrier 12 and the first cover plate 1 form a recess having an accommodating space in combination, the first insulating member 3 includes a first protruding portion 32, and the first protruding portion 32 is accommodated in the recess formed by combining the first surrounding barrier 12 and the first cover plate 1.

As shown in fig. 12, the second surrounding barrier 35 is disposed at an edge of the first insulating member 3 along a circumferential direction of the first insulating member 3 and extends from the first insulating member 3 to a direction close to the first cover plate 1, the second surrounding barrier 35 and the first insulating member 3 form a recess having an accommodating space in combination, the first cover plate 1 includes the second protruding portion 13, and the second protruding portion 13 is accommodated in the recess formed by the combination of the second surrounding barrier 35 and the first insulating member 3.

By providing the first enclosure 12, at least a portion of the first insulating member 3 can be accommodated in a recess formed by the combination of the first enclosure 12 and the first cover plate 1, so that the first enclosure 12 limits the rotation of the first insulating member 3 relative to the first cover plate 1. Alternatively, by providing the second enclosure 35, at least a portion of the first cover plate 1 may be accommodated in a recess formed by the combination of the second enclosure 35 and the first insulating member 3, so that the second enclosure 35 limits the rotation of the first insulating member 3 relative to the first cover plate 1.

In some embodiments, the first enclosure 12 and the first cover plate 1 form a non-rotation fit with the first protrusion 32, for example, the first enclosure 12 has a square structure, the first enclosure 12 and the first cover plate 1 form a square accommodating space in combination, and the first protrusion 32 has a square shape, so that the first enclosure 12 can limit the rotation of the first insulating member 3 relative to the first cover plate 1; the concave part formed by combining the second surrounding barrier 35 and the first insulating member 3 is in non-rotation fit with the second protruding part 13, for example, the second surrounding barrier 35 is in a square structure, the second surrounding barrier 35 and the first insulating member 3 are combined to form a square accommodating space, and the second protruding part 13 is square, so that the second surrounding barrier 35 can limit the rotation of the first insulating member 3 relative to the first cover plate 1.

In some embodiments, the second enclosure structure comprises a third enclosure 23 and a fourth enclosure 33. The third surrounding barrier 23 is arranged at the edge of the second cover plate 2 along the circumferential direction of the second cover plate 2, and the first insulating member 3 is at least partially accommodated in a concave part formed by combining the third surrounding barrier 23 and the second cover plate 2 so as to limit the relative rotation of the second cover plate 2 and the first insulating member 3; the fourth enclosure 33 is disposed at an edge of the first insulating member 3 along a circumferential direction of the first insulating member 3, and the second cover plate 2 is at least partially accommodated in a recess formed by combining the fourth enclosure 33 and the first insulating member 3 to limit relative rotation between the second cover plate 2 and the first insulating member 3.

As shown in fig. 12, the third surrounding barrier 23 is disposed at an edge of the second cover plate 2 along a circumferential direction of the second cover plate 2 and extends from the second cover plate 2 to a direction close to the first insulating member 3, the third surrounding barrier 23 and the second cover plate 2 form a recess having an accommodating space in combination, the first insulating member 3 includes a third protruding portion 34, and the third protruding portion 34 is accommodated in the recess formed by the combination of the third surrounding barrier 23 and the second cover plate 2.

As shown in fig. 9 to 11, the fourth surrounding barrier 33 is disposed at an edge of the first insulating member 3 along a circumferential direction of the first insulating member 3 and extends from the first insulating member 3 to a direction close to the second cover plate 2, the fourth surrounding barrier 33 and the first insulating member 3 form a recess having a receiving space in combination, the second cover plate 2 includes a fourth protruding portion 22, and the fourth protruding portion 22 is received in the recess formed by combining the fourth surrounding barrier 33 and the first insulating member 3.

By providing the third surrounding barrier 23, at least a portion of the first insulating member 3 can be accommodated in the recess formed by the combination of the third surrounding barrier 23 and the second cover plate 2, so that the third surrounding barrier 23 limits the rotation of the first insulating member 3 relative to the second cover plate 2. Alternatively, by providing the fourth surrounding barrier 33, at least a portion of the second cover plate 2 can be accommodated in a recess formed by combining the fourth surrounding barrier 33 and the first insulating member 3, so that the fourth surrounding barrier 33 limits the rotation of the first insulating member 3 relative to the second cover plate 2.

In some embodiments, the concave portion formed by the combination of the third surrounding barrier 23 and the second cover plate 2 is in non-rotation fit with the third protruding portion 34, for example, the third surrounding barrier 23 is in a square structure, the third surrounding barrier 23 and the second cover plate 2 are combined to form a square accommodating space, and the third protruding portion 34 is in a square shape, so that the third surrounding barrier 23 can limit the rotation of the first insulating member 3 relative to the second cover plate 2; the concave part formed by combining the fourth surrounding barrier 33 and the first insulating member 3 and the fourth protruding part 22 are in non-rotation fit, for example, the fourth surrounding barrier 33 is of a square structure, the fourth surrounding barrier 33 and the first insulating member 3 are combined to form a square accommodating space, and the fourth protruding part 22 is square, so that the fourth surrounding barrier 33 can limit the rotation of the first insulating member 3 relative to the second cover plate 2.

As shown in fig. 13 and 14, the manner of connecting the first electrode assembly 40 and the second electrode assembly 50 can be seen. A first tab 40a on the first electrode assembly 40 and a second tab 50a on the second electrode assembly 50 are electrically connected through the end cap assembly 10, the other tab of the first electrode assembly 40 is connected to a terminal on the first end cap assembly 60, and the other tab of the second electrode assembly 50 is connected to a terminal on the second end cap assembly 70.

As shown in fig. 15 to 21, in some embodiments, the rotation preventing device 9 includes a first rotation preventing portion 91 and a second rotation preventing portion 93, the first rotation preventing portion 91 is disposed between the first insulating member 3 and the first cover plate 1 and is configured to prevent the first insulating member 3 and the first cover plate 1 from rotating relative to each other, and the second rotation preventing portion 93 is disposed between the first insulating member 3 and the second cover plate 2 and is configured to prevent the first insulating member 3 and the second cover plate 2 from rotating relative to each other.

In this embodiment, the first rotation preventing portion 91 provided between the first insulating member 3 and the first cover 1 can prevent the relative rotation between the first insulating member 3 and the first cover 1. The second rotation preventing part 93, which is provided between the first insulating member 3 and the second cover plate 2, can prevent relative rotation between the first insulating member 3 and the second cover plate 2. After the first insulating part 3 and the first cover plate 1 and the first insulating part 3 and the second cover plate 2 are limited to rotate relatively by the first rotation preventing part 91 and the second rotation preventing part 93 respectively, the anti-rotation capacity between the first cover plate 1 and the second cover plate 2 is also improved, the anti-rotation capacity between the first shell 20 connected with the first cover plate 1 and the second shell 30 connected with the second cover plate 2 is also improved, so that the battery cell correspondingly assembled by the end cover assembly can keep the relative stability between the first cover plate and the second cover plate, the anti-rotation capacity of the whole battery cell can be effectively improved, and the structural stability of the battery cell is improved.

In some embodiments, the first cover plate 1 and the first insulating member 3 are both provided with a first groove 92 on one, and a first rotation preventing portion 91 on the other, and the first rotation preventing portion 91 is embedded in the first groove 92;

in both the second cover plate 2 and the first insulating member 3, a second groove 94 is provided on one of them, a second rotation preventing portion 93 is provided on the other one, and the second rotation preventing portion 93 is embedded in the second groove 94.

In this embodiment, the first rotation preventing portion 91 is disposed on one of the first cover plate 1 and the first insulating member 3, the corresponding first groove 92 is disposed on the other, the second rotation preventing portion 93 is disposed on one of the first insulating member 3 and the second cover plate 2, and the corresponding second groove 94 is disposed on the other, so that the first rotation preventing portion 91 and the first groove 92 are engaged with each other, and the second rotation preventing portion 93 and the second groove 94 are engaged with each other, thereby providing a better effect of preventing relative rotation between the first cover plate 1 and the first insulating member 3 and between the first insulating member 3 and the second cover plate 2.

In the embodiment shown in fig. 15 to 18, the first rotation preventing portion 91 is disposed on the second cover 2, the first rotation preventing portion 91 protrudes from the surface of the second cover 2 close to the first insulating member 3 to the direction close to the first insulating member 3, the first groove 92 of the first insulating member 3, the first groove 92 extends from the side surface of the first insulating member 3 close to the second cover 2 to the direction close to the first cover 1, and the first rotation preventing portion 91 is embedded in the first groove 92; the second rotation preventing portion 93 is disposed on the first insulating member 3, the second rotation preventing portion 93 protrudes from the surface of the first insulating member 3 close to the first cover plate 1 toward the direction close to the first cover plate 1, the first cover plate 1 is provided with a second groove 94, the second groove 94 extends from the side surface of the first cover plate 1 close to the first insulating member 3 toward the direction away from the first insulating member 3, and the second rotation preventing portion 93 is embedded in the second groove 94.

In this embodiment, the second cover plate 2 and the first insulating member 3 which are adjacently arranged are respectively provided with a corresponding first anti-rotation portion 91 and a corresponding first groove 92, the first insulating member 3 and the first cover plate 1 which are adjacently arranged are respectively provided with a corresponding second anti-rotation portion 93 and a corresponding second groove 94, the first insulating member 3 which is simultaneously provided with the first groove 92 and the second anti-rotation portion 93 is positioned between the first cover plate 1 and the second cover plate 2, the protruding directions of the first anti-rotation portion 91 and the second anti-rotation portion 93 are the same, two homodromous concave-convex matching structures are formed between the first cover plate 1, the first insulating member 3 and the second cover plate 2, and the effect of better preventing relative rotation between the first cover plate 1 and the first insulating member 3 and between the first insulating member 3 and the second cover plate 2 is achieved.

In other embodiments, the first rotation preventing portion 91 is disposed on the first cover 1, the first insulating member 3 is provided with a first groove 92, the second rotation preventing portion 93 is disposed on the first insulating member 3, the second cover 2 is provided with a second groove 94, the first rotation preventing portion 91 is embedded in the first groove 92, and the second rotation preventing portion 93 is embedded in the second groove 94. In this embodiment, two co-directional male and female mating structures are also formed between the first cover plate 1, the first insulating member 3 and the second cover plate 2, except that the protruding direction of the male and female mating structures is opposite to that of the male and female mating structures in the embodiment shown in fig. 15 to 18.

As shown in fig. 19 to 21, in some embodiments, a projection of the first groove 92 and a projection of the second rotation preventing part 93 are staggered from each other on a plane perpendicular to the insertion direction of the first rotation preventing part 91.

In this embodiment, the projection of the first groove 92 and the projection of the second rotation preventing portion 93 are staggered, so that the matching structure of the first rotation preventing portion 91 and the first groove 92 and the matching structure of the second rotation preventing portion 93 and the second groove 94 can be dispersed at different positions, thereby increasing the coverage area of the rotation preventing device 9 and improving the rotation preventing effect.

As shown in fig. 15 to 18, in some embodiments, a projection of the first groove 92 on a plane perpendicular to the fitting direction of the first rotation preventing part 91 falls within a projection range of the second rotation preventing part 93.

In this embodiment, the projection of the first groove 92 falls within the projection range of the second rotation preventing portion 93, that is, the first groove 92 is disposed under the protruding position of the second rotation preventing portion 93, and the recessed position of the first groove 92 is just opposite to the protruding position of the second rotation preventing portion 93, so that two mutually nested concave-convex matching structures can be formed between the first cover plate 1, the first insulating member 3 and the second cover plate 2, thereby effectively enhancing the overall strength of the rotation preventing device 9 and improving the rotation preventing effect.

In some embodiments, the first groove 92 is disposed on the first insulating member 3, the second groove 94 is disposed on the second cover 2, and the first rotation preventing portion 91 at least partially protrudes into the second groove 94 in the insertion direction of the first rotation preventing portion 91.

In this embodiment, at least part of the first rotation prevention part 91 can project into the second groove 94, i.e. the depth h of the first groove 92 is greater than the thickness t of the first insulating member 3, so that part of the second groove 94 falls into the first groove 92, and the second rotation prevention part 93 is located between the groove wall of the first groove 92 and the groove wall of the second groove 94. This has the advantage that the first recess 92 can include a portion higher than the side of the first insulating member 3 close to the second cover 2, and the portion can be embedded in the second recess 94 provided on the second cover 2, so that the first rotation preventing portion 91 engaged with the first recess 92 can also partially enter the second recess 94, and the torsion force applied to the first cover 1 can be directly transmitted to the second cover 2 through the first rotation preventing portion 91 via the second rotation preventing portion 93 on the first insulating member 3, thereby reducing the strength requirement on the first insulating member 3 and allowing the thickness of the first insulating member 3 to be properly reduced.

In some embodiments, a protruding dimension of a portion of the first rotation preventing part 91 protruding into the second groove 94 in the insertion direction of the first rotation preventing part 91 is greater than or equal to 0.2mm.

In this embodiment, the protruding dimension of the portion of the first rotation-preventing portion 91 protruding into the second groove 94 is greater than or equal to 0.2mm, that is, the difference between the depth h of the first groove 92 and the thickness t of the first insulating member 3 is greater than or equal to 0.2mm, which is enough to directly transmit the twisting force applied to the first cover plate 1 to the second cover plate 2 through the first rotation-preventing portion 91, thereby improving the force transmission and rotation-preventing effects.

In various embodiments of the present application, the shapes of the first rotation preventing part 91 and the second rotation preventing part 93 may be variously selected, such as a cylindrical shape, a tetragonal shape, and the like. The shapes of the first and

second grooves

92 and 94 match the shapes of the first and second

rotation preventing parts

91 and 93, respectively.

As shown in fig. 6, in some embodiments, the end cap assembly 10 further includes a first conductive member 4 and a second conductive member 5, the second conductive member 5 is disposed on a side of the second cover plate 2 away from the first insulating member 3, the first conductive member 4 includes a connection column 41 and a limiting portion 42, the limiting portion 42 is disposed on a side of the first cover plate 1 away from the first insulating member 3, the first cover plate 1 is provided with a first through hole 11, the second cover plate 2 is provided with a second through hole 21, the first insulating member 3 is provided with a third through hole 31, the connection column 41 sequentially passes through the first through hole 11, the third through hole 31 and the second through hole 21 and is connected to the second conductive member 5, and the limiting portion 42 is configured to limit the first conductive member 4 from moving along an axial direction of the first through hole 11.

In this embodiment, the electrical connection between the first electrode assembly 40 in the first case 20 and the second electrode assembly 50 in the second case 30 is achieved through the first conductive member 4 and the second conductive member 5.

In some embodiments, the second conductive member 5 is provided with a fourth through hole 51, and the connection column 41 passes through the fourth through hole 51 to connect the first conductive member 4 and the second conductive member 5.

In some embodiments, the end cap assembly 10 further includes a second insulating member 6 and a third insulating member 7, the second insulating member 6 is disposed between the first cover plate 1 and the stopper portion 42, the third insulating member 7 is disposed between the second cover plate 2 and the second conductive member 5, the second insulating member 6 is provided with a fifth through hole 61, the third insulating member 7 is provided with a sixth through hole 71, and the connection column 41 passes through the fifth through hole 61 and the sixth through hole 71.

In this embodiment, the first cover plate 1 and the stopper portion 42 of the first conductive member 4 may be electrically isolated by the second insulating member 6; the second cover plate 2 and the second conductive member 5 can be electrically isolated by the third insulating member 7.

In some embodiments, the end cap assembly 10 further includes a first sealing element 81, the first sealing element 81 is disposed between the limiting portion 42 and the second insulating element 6, the first sealing element 81 is provided with a seventh through hole, the connecting column 41 passes through the seventh through hole, and the first sealing element 81 is axially embedded in the fifth through hole 61 and the first through hole 11 to isolate the first cover plate 1 and the limiting portion 42 and the first cover plate 1 and the connecting column 41; and/or, a second sealing element 82 is further included, the second sealing element 82 is arranged between the second conducting component 5 and the third insulating component 7, the second sealing element 82 is provided with an eighth through hole, the connecting column 41 penetrates through the eighth through hole, and the second sealing element 82 is embedded into the sixth through hole 71 and the second through hole 21 along the axial direction so as to isolate the second cover plate 2 and the second conducting component 5 and the second cover plate 2 and the connecting column 41.

In this embodiment, by providing the first sealing member 81, it is possible to make the tight connection between the stopper portion 42 of the first conductive member 4 and the second insulating member 6 in the axial direction, isolate the stopper portion 42 of the first conductive member 4 and the first cover plate 1 in the axial direction, and isolate the first cover plate 1 and the connection post 41 of the first conductive member 4 in the radial direction. By providing the second sealing member 82, it is possible to provide a tight connection between the second conductive member 5 and the third insulating member 7 in the axial direction, to isolate the second conductive member 5 from the second cover plate 2 in the axial direction, and to isolate the second cover plate 2 from the connection post 41 of the first conductive member 4 in the radial direction.

Embodiments of the battery cell and end cap assembly provided by the present application are described below with reference to fig. 3-21.

As shown in fig. 3 and 4, the battery cell includes an end cap assembly 10, a first case 20, a second case 30, a first electrode assembly 40, a second electrode assembly 50, a first end cap assembly 60, and a second end cap assembly 70.

end cap assemblies

60 and 70 are disposed at ends of the first and

second cases

20 and 30, respectively, which are distant from the openings of each other.

The first case 20 and the second case 30 are both square cases.

As shown in fig. 5 to 7, the end cap assembly includes a first cap plate 1, a second cap plate 2, a first insulating member 3, a first conductive member 4, a second conductive member 5, a second insulating member 6, a third insulating member 7, a first sealing member 81, and a second sealing member 82.

The first insulating member 3 is disposed between the first cover plate 1 and the second cover plate 2 to insulate the first cover plate 1 from the second cover plate 2.

The second insulator 6 is disposed on one side of the first cover plate 1 away from the first insulator 3, and the third insulator 7 is disposed on one side of the second cover plate 2 away from the first insulator 3. The first conductive member 4 includes a connection column 41 and a limiting portion 42, the limiting portion 42 is disposed on one side of the second insulating member 6 far away from the first cover plate 1, and the connection column 41 is connected to one side of the limiting portion 42 close to the second insulating member 6. The second conductive member 5 is disposed on a side of the third insulating member 7 away from the second cover plate 2.

First apron 1 is equipped with first through-hole 11, second apron 2 is equipped with second through-hole 21, first insulating part 3 is equipped with third through-hole 31, second electrically conductive piece 5 is equipped with fourth through-hole 51, second insulating part 6 is equipped with fifth through-hole 61, third insulating part 7 is equipped with sixth through-hole 71, first sealing member 81 is equipped with the seventh through-hole, second sealing member 82 is equipped with the eighth through-hole, spliced pole 41 passes seventh through-hole, fifth through-hole 61, first through-hole 11, third through-hole 31, second through-hole 21, sixth through-hole 71, eighth through-hole and fourth through-hole 51 are in order to be connected with second electrically conductive piece 5 in proper order, spacing portion 42 is used for restricting first electrically conductive piece 4 along the axis direction motion of first through-hole 11.

The first cover plate 1, the second cover plate 2, the first insulating member 3, the limiting portion 42 of the first conductive member 4, the second conductive member 5, the second insulating member 6, and the third insulating member 7 are all square.

The first electrode assembly 40 in the first case 20 and the second electrode assembly 50 in the second case 30 are electrically connected through the first conductive member 4 and the second conductive member 5.

The first sealing member 81 is disposed between the position-limiting portion 42 and the second insulating member 6, and can enable the tight connection between the position-limiting portion 42 of the first conductive member 4 and the second insulating member 6 in the axial direction, isolate the position-limiting portion 42 of the first conductive member 4 from the first cover plate 1 in the axial direction, and isolate the first cover plate 1 from the connection post 41 of the first conductive member 4 in the radial direction. The second sealing member 82 is disposed between the second conductive member 5 and the third insulating member 7, and can make the tight connection between the second conductive member 5 and the third insulating member 7 in the axial direction, isolate the second conductive member 5 and the second cover plate 2 in the axial direction, and isolate the connection post 41 of the second cover plate 2 and the first conductive member 4 in the radial direction.

In the embodiment shown in fig. 5 to 7, the portion of the connection column 41 passing through the first through hole 11 is a square structure, and the first through hole 11 is a square hole non-rotatably matched with the square structure to limit the relative rotation of the connection column 41 and the first cover plate 1; the part of the connecting column 41 penetrating through the second through hole 21 is of a square structure, the second through hole 21 is a square hole which is in non-rotation fit with the square structure, so that relative rotation of the connecting column 41 and the second through hole 21 is limited, and the purpose of limiting relative rotation of the first cover plate 1 and the second cover plate 2 is achieved.

In the exemplary embodiment shown in fig. 8, the first insulating part 3 is fixedly bonded to the first cover plate 1 by means of a first adhesive structure 1a, and the first insulating part 3 is fixedly bonded to the second cover plate 2 by means of a second adhesive structure 2 a. This embodiment realizes the relative fixation between the first cover plate 1 and the first insulating member 3 through the first adhesive structure 1a, and realizes the relative fixation between the second cover plate 2 and the first insulating member 3 through the second adhesive structure 2a, thereby realizing the purpose of preventing the first cover plate 1 and the second cover plate 2 from rotating relatively.

In the embodiment shown in fig. 9 to 11, the rotation preventing device 9 includes a first surrounding barrier 12 and a fourth surrounding barrier 33, the first surrounding barrier 12 is disposed on the edge of the first cover plate 1 along the circumferential direction of the first cover plate 1, the first insulating member 3 includes a first protruding portion 32, and the first protruding portion 32 is accommodated in a recess formed by combining the first surrounding barrier 12 and the first cover plate 1 to limit the relative rotation between the first cover plate 1 and the first insulating member 3; the fourth surrounding barrier 33 is arranged at the edge of the first insulating member 3 along the circumferential direction of the first insulating member 3, the second cover plate 2 comprises a fourth protruding portion 22, and the fourth protruding portion 22 is accommodated in a concave portion formed by combining the fourth surrounding barrier 33 and the first insulating member 3 so as to limit the relative rotation of the second cover plate 2 and the first insulating member 3, thereby achieving the purpose of preventing the first cover plate 1 and the second cover plate 2 from relative rotation.

In the embodiment shown in fig. 12, the anti-rotation device 9 includes a second surrounding barrier 35 and a third surrounding barrier 23, the second surrounding barrier 35 is disposed at the edge of the first insulating member 3 along the circumferential direction of the first insulating member 3, the first cover plate 1 includes a second protruding portion 13, and the second protruding portion 13 is accommodated in a concave portion formed by combining the second surrounding barrier 35 and the first insulating member 3 to limit the relative rotation of the first cover plate 1 and the first insulating member 3; the third enclosing barrier 23 is arranged at the edge of the second cover plate 2 along the circumferential direction of the second cover plate 2, the first insulating member 3 comprises a third protruding part 34, and the third protruding part 34 is accommodated in a concave part formed by combining the third enclosing barrier 23 and the second cover plate 2 so as to limit the relative rotation of the second cover plate 2 and the first insulating member 3, and further realize the purpose of preventing the relative rotation of the first cover plate 1 and the second cover plate 2.

As shown in fig. 13 and 14, the first tab 40a of the first electrode assembly 40 and the second tab 50a of the second electrode assembly 50 are electrically connected through the end cap assembly 10, and the other tab of the first electrode assembly 40 is connected to a terminal of the first end cap assembly 60 and the other tab of the second electrode assembly 50 is connected to a terminal of the second end cap assembly 70.

In the embodiment shown in fig. 15 to 18, the rotation preventing device 9 includes a first rotation preventing portion 91 and a second rotation preventing portion 93, the first rotation preventing portion 91 is disposed on the second cover plate 2, the first insulating member 3 is provided with a first groove 92, the second rotation preventing portion 93 is disposed on the first insulating member 3, the first cover plate 1 is provided with a second groove 94, the first rotation preventing portion 91 is embedded in the first groove 92, and the second rotation preventing portion 93 is embedded in the second groove 94. In this embodiment, the purpose of preventing the relative rotation of the first cover plate 1 and the second cover plate 2 is achieved by the cooperation of the first rotation preventing part 91 and the first groove 92 and the cooperation of the second rotation preventing part 93 and the second groove 94.

In other embodiments, the first rotation preventing portion 91 is disposed on the first cover plate 1, the first insulating member 3 is provided with a first groove 92, the second rotation preventing portion 93 is disposed on the first insulating member 3, the second cover plate 2 is provided with a second groove 94, the first rotation preventing portion 91 is embedded in the first groove 92, and the second rotation preventing portion 93 is embedded in the second groove 94. In this embodiment, the purpose of preventing the relative rotation of the first cover plate 1 and the second cover plate 2 is also achieved by the cooperation of the first rotation preventing portion 91 and the first groove 92 and the cooperation of the second rotation preventing portion 93 and the second groove 94, but the protruding direction of the concavo-convex fitting structure is opposite to that of the concavo-convex fitting structure in the embodiment shown in fig. 15 to 18.

In the embodiment shown in fig. 15 to 18, the projection of the first groove 92 falls within the projection range of the second rotation preventing part 93 on a plane perpendicular to the fitting direction of the first rotation preventing part 91.

In the embodiment shown in fig. 19 to 21, the projection of the first groove 92 and the projection of the second rotation preventing part 93 are offset from each other on a plane perpendicular to the fitting direction of the first rotation preventing part 91.

According to the embodiment of the end cover assembly, the anti-rotation device is arranged, so that the first cover plate and the second cover plate can be effectively prevented from rotating relatively, and further the first shell connected with the first cover plate and the second shell connected with the second cover plate are prevented from rotating relatively, so that the anti-torsion capacity of the whole battery cell is improved, and the quality of the battery cell is improved; and electrolyte leakage caused by torsion of the electrode assembly in the shell can be prevented, so that safety accidents are prevented.

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

Claims

1. An end cap assembly (10) comprising:

a first cover plate (1) for closing the first housing (20);

a second cover plate (2) for closing a second housing (30), the second cover plate (2) being arranged opposite to the first cover plate (1) in a first direction; and

an anti-rotation device (9) configured to prevent relative rotation between the first cover plate (1) and the second cover plate (2).

2. The end cap assembly (10) of claim 1, further comprising a first insulator (3) disposed between the first and second cap plates (1, 2) to insulate the first and second cap plates (1, 2).

3. The end cap assembly (10) according to claim 1 or 2, wherein the rotation prevention device (9) comprises a connection post (41), the first cover plate (1) is provided with a first through hole (11), the second cover plate (2) is provided with a second through hole (21), one end of the connection post (41) passes through the first through hole (11) and is used for electrically connecting a first electrode assembly (40) in the first housing (20), the other end of the connection post (41) is provided with the second through hole (21) and is used for electrically connecting a second electrode assembly (50) in the second housing (30), and the connection post (41) is non-rotatably matched with the first through hole (11) and the second through hole (21), respectively.

4. The end cap assembly (10) of claim 3, wherein the portion of the connecting post (41) passing through the first through hole (11) and the portion of the connecting post (41) passing through the second through hole (21) are each square structures, and the first through hole (11) and the second through hole (21) are each square holes non-rotatably fitted with the corresponding square structures.

5. The end cap assembly (10) according to claim 2, wherein the anti-rotation device (9) comprises:

the first bonding structure (1 a) is used for fixedly bonding the first insulating piece (3) with the first cover plate (1) through the first bonding structure (1 a); and

and the first insulating piece (3) is fixedly bonded with the second cover plate (2) through the second bonding structure (2 a).

6. The end cap assembly (10) according to claim 2, wherein the first cover plate (1) and the first insulating member (3) are both provided with a first enclosing structure on the periphery of one, and the side wall of the other abuts against the side wall of the first enclosing structure to limit the relative rotation of the first cover plate (1) and the first insulating member (3);

and a second surrounding structure is annularly arranged on the peripheral edge of one of the second cover plate (2) and the first insulating piece (3), and the side wall of the other one of the second cover plate and the first insulating piece abuts against the side wall of the second surrounding structure so as to limit the relative rotation of the second cover plate (2) and the first insulating piece (3).

7. The end cap assembly (10) according to claim 2, wherein the rotation prevention means (9) comprises a first rotation prevention portion (91) and a second rotation prevention portion (93), the first rotation prevention portion (91) being provided between the first insulator (3) and the first cap plate (1) and preventing relative rotation of the first insulator (3) and the first cap plate (1), the second rotation prevention portion (93) being provided between the first insulator (3) and the second cap plate (2) and preventing relative rotation of the first insulator (3) and the second cap plate (2).

8. The end cap assembly (10) according to claim 7, wherein a first groove (92) is provided on one of the first cover plate (1) and the first insulator (3), the first anti-rotation portion (91) is provided on the other, and the first anti-rotation portion (91) is embedded in the first groove (92);

one of the second cover plate (2) and the first insulating member (3) is provided with a second groove (94), the other one of the second cover plate and the first insulating member is provided with a second rotation preventing part (93), and the second rotation preventing part (93) is embedded into the second groove (94).

9. The end cap assembly (10) according to claim 8, wherein a projection of the first groove (92) and a projection of the second anti-rotation portion (93) are offset from each other on a plane perpendicular to an embedding direction of the first anti-rotation portion (91).

10. The end cap assembly (10) according to claim 8, wherein a projection of the first groove (92) on a plane perpendicular to an embedding direction of the first rotation preventing portion (91) falls within a projection range of the second rotation preventing portion (93).

11. The end cap assembly (10) according to claim 10, wherein the first recess (92) is provided on the first insulating member (3) and the second recess (94) is provided on the second cover plate (2), the first anti-rotation portion (91) at least partially protruding into the second recess (94) in an embedding direction of the first anti-rotation portion (91).

12. The end cap assembly (10) of claim 11, wherein a protruding dimension of a portion of the first anti-rotation portion (91) protruding into the second groove (94) in an embedding direction of the first anti-rotation portion (91) is greater than or equal to 0.2mm.

13. A battery cell (101) comprising an end cap assembly (10) according to any one of claims 1 to 12.

14. A battery (100) comprising a case (102) with the battery cell (101) of claim 13, the battery cell (101) being disposed in the case (102), the battery cell (101) being configured to provide electrical energy.

15. An electric consumer comprising a battery cell (101) according to claim 13, the battery cell (101) being adapted to supply electric energy to the electric consumer; alternatively, comprising a battery (100) according to claim 14, the battery (100) being adapted to supply electrical energy to the electrical device.