Battery cover plate assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate assembly and a battery. The battery cover plate assembly comprises a cover plate body, a pole piece, a sealing assembly, a pole fixing assembly, a first insulating assembly and a second insulating assembly, the cover plate body is provided with a pole through hole, and the pole piece is arranged in the pole through hole in a penetrating mode. And the sealing assembly is partially clamped between the inner wall of the pole through hole and the pole piece. The first insulating component is arranged on one side, deviating from the battery cell, of the cover plate body; and the second insulating component is arranged on one side, facing the battery cell, of the cover plate body. The pole fixing assembly is clamped on one side, deviating from the battery cell, of the cover plate body, and one part of the pole piece is positioned between the pole fixing assembly and the cover plate body. According to the battery cover plate assembly, the structural stability can be effectively improved, and the problem of battery failure caused by separation of the pole piece can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover assembly and a battery. Background Art

[0002] The battery includes a cover plate, a battery shell and a battery cell. The battery cell is arranged inside the battery shell, and the cover plate is sealed at the opening of the battery shell to encapsulate the battery cell in the battery shell. One end of the pole is connected to the pole ear of the battery cell, and the other end extends out of the cover plate and is connected to the external conductor to realize the current conduction inside and outside the battery.

[0003] In the production process of the above-mentioned battery, the pole is generally assembled with the cover plate by insertion. In subsequent use, if the pole is subjected to external force, it is easy to come out of the pole through hole on the cover plate, causing damage to the battery and failure.

[0004] Therefore, there is an urgent need for a battery cover assembly and a battery to solve the above problems. Utility Model Content

[0005] According to one aspect of the utility model, an object is to provide a battery cover assembly, which can effectively improve the structural stability and prevent the problem of battery failure caused by the pole part falling out.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Battery cover assembly, including:

[0008] A cover plate body, wherein the cover plate body is provided with a pole through hole;

[0009] A pole piece, penetrating through the pole through hole;

[0010] A sealing assembly, wherein the sealing assembly is partially sandwiched between the inner wall of the pole through hole and the pole piece;

[0011] A first insulating component, the first insulating component is arranged on a side of the cover body away from the battery cell;

[0012] A second insulating component, the second insulating component is arranged on a side of the cover body facing the battery cell;

[0013] A pole fixing assembly is clamped on a side of the cover body away from the battery core, and a portion of the pole piece is located between the pole fixing assembly and the cover body;

[0014] The pole fixing assembly comprises a pressing portion and a clamping portion, and the clamping portion and the pressing portion have the same length extension direction;

[0015] The cover body is provided with a slot on the circumferential outer side of the pole through hole, and the clamping portion is clamped in the slot;

[0016] The back side of the pole fixing assembly abuts against the cover plate body.

[0017] As a preferred solution of the battery cover assembly provided by the utility model, a protruding structure is arranged on the inner wall of the card slot close to the pole piece, and the height of the upper end surface of the card slot gradually decreases along the direction close to the central axis of the pole fixing assembly, and the side of the protruding structure facing the card slot is an inclined pressing surface, and the inclined pressing surface presses against the upper end surface of the card slot.

[0018] As a preferred solution of the battery cover assembly provided by the utility model, a protruding structure is arranged on one side of the card slot close to the pole piece, the upper end face of the card slot is parallel to the cover body, the protruding structure extends toward the card slot and parallel to the cover body to form a pressing platform, and the pressing platform presses against the upper end face of the card slot.

[0019] As a preferred solution of the battery cover assembly provided by the utility model, the pole piece includes a pole body and a protrusion, and the protrusion is arranged around the circumference of the pole body;

[0020] The protruding portion is located between the pressing portion and the cover plate body.

[0021] As a preferred solution of the battery cover assembly provided by the utility model, an annular boss is provided around the inner wall of the pole through hole, and the protruding portion abuts against the annular boss.

[0022] As a preferred solution of the battery cover assembly provided by the utility model, at least part of the sealing component is sandwiched between the side of the annular boss away from the battery cell and the protrusion; and / or,

[0023] At least part of the sealing assembly is sandwiched between the side of the annular boss and the pole body; and / or,

[0024] The sealing component abuts against the second insulating component.

[0025] As a preferred solution of the battery cover assembly provided by the utility model, the sealing assembly includes a first sealing portion and a second sealing portion arranged at an angle, the first sealing portion is axially clamped between the side of the annular boss away from the battery cell and the protruding portion, and the second sealing portion is radially clamped between the side of the annular boss and the pole body; the first sealing portion and the second sealing portion are fixedly connected to each other or abut against each other.

[0026] As a preferred solution of the battery cover assembly provided by the utility model, the second insulating component is arranged on the side of the cover body facing the battery cell, and the second insulating component has a through hole corresponding to the position of the pole through hole, and the pole member is electrically connected to the battery cell through the through hole.

[0027] According to another aspect of the utility model, the object is to provide a battery, which includes a battery cell and a battery shell, and also includes a battery cover assembly as described in any of the above schemes, wherein the cover body is sealed at the opening of the battery shell, and the pole piece is connected to the battery cell.

[0028] Beneficial effects of the utility model:

[0029] The battery cover assembly provided by the utility model includes a cover body, a pole piece, a sealing component, a pole fixing component, a first insulating component and a second insulating component. The cover body is provided with a pole through hole, and the pole piece passes through the pole through hole. The sealing component is partially sandwiched between the inner wall of the pole through hole and the pole piece. The sealing component can prevent external substances from entering the pole through hole, and can also prevent the electrolyte from leaking out of the pole through hole. The first insulating component is arranged on the side of the cover body away from the battery cell; the second insulating component is arranged on the side of the cover body facing the battery cell. A part of the pole piece is located between the pole fixing component and the cover body, and the pole fixing component is clamped on the side of the cover body away from the battery cell, and the back of the pole fixing component is in contact with the cover body. The cover body forms a wrapping fixing structure for the pole fixing component, which can effectively prevent external forces from all directions from damaging the sealing of the battery. In other words, through the pole fixing assembly, the pole piece can be further positioned in the pole through hole, improving the structural integrity and structural stability of the pole piece and the cover plate body, and preventing the pole piece from slipping out of the pole through hole, causing battery failure. And the first insulating assembly can further improve the stability of the pole fixing assembly and achieve insulation at the pole through hole. Through the second insulating assembly, the insulation performance of positions other than the pole piece can be guaranteed, and the sealing performance at the pole through hole can be further improved by abutting with the sealing assembly.

[0030] The battery provided by the utility model adopts the battery cover assembly, which can improve the structural reliability and prevent failure due to structural damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of a battery provided by an embodiment of the utility model;

[0032] Figure 2 It is a partial structural schematic diagram of a battery cover assembly provided by an embodiment of the utility model;

[0033] Figure 3It is a schematic diagram of the exploded structure of the battery cover assembly provided by the embodiment of the utility model;

[0034] Figure 4 It is a partial structural cross-sectional view of a battery cover assembly provided by an embodiment of the utility model;

[0035] Figure 5 It is a schematic diagram of the structure of the pole member provided in the embodiment of the utility model;

[0036] Figure 6 It is a structural schematic diagram of a pole fixing assembly provided by an embodiment of the utility model;

[0037] Figure 7 is a cross-sectional view of a pole fixing assembly provided in an embodiment of the utility model;

[0038] Figure 8 It is a partial structural cross-sectional view of a cover plate body provided by an embodiment of the utility model;

[0039] Fig. 9 It is a partial structural sectional view of a cover body provided by another embodiment of the utility model.

[0040] In the figure:

[0041] 1. Battery housing;

[0042] 100, cover plate body; 110, pole through hole; 111, annular boss; 120, slot; 130, raised structure; 131, inclined pressing surface; 132, pressing platform; 140, injection hole; 150, explosion-proof hole;

[0043] 200, pole piece; 210, pole body; 220, protrusion;

[0044] 300, pole fixing assembly; 310, pressing portion; 320, clamping portion; 321, back side; 330, connecting portion;

[0045] 400, sealing assembly; 410, first sealing part; 420, second sealing part;

[0046] 500, a first insulating component;

[0047] 600, second insulating component; 610, penetration hole;

[0048] 700, explosion-proof component; 710, explosion-proof valve; 720, explosion-proof disk; 730, protective film. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0050] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0053] Figure 1 A schematic diagram showing the structure of a battery provided by an embodiment of the utility model is shown; Figure 2 A partial structural schematic diagram of a battery cover assembly provided by an embodiment of the utility model is shown; Figure 3 The following is a schematic diagram of the exploded structure of the battery cover assembly provided by the embodiment of the utility model. Figure 1-Figure 3 , this embodiment provides a battery cover assembly and a battery.

[0054] Reference Figure 1The battery includes a battery cell and a battery housing 1, and also includes a battery cover assembly provided in this embodiment. The battery cell is arranged in the battery housing 1, and the cover body 100 is sealed at the opening of the battery housing 1 to encapsulate the battery cell.

[0055] Continue to refer to Figure 1-Figure 3 The battery cover assembly includes a cover body 100, a pole piece 200, a sealing assembly 400, a pole fixing assembly 300, a first insulating assembly 500 and a second insulating assembly 600. Two pole through holes 110 are provided on the cover body 100 along its length direction. The pole pieces 200 correspond to each other and are arranged through the pole through holes 110, extending to the side of the cover body 100 away from the battery cell. It should be noted that the two pole pieces 200 are respectively connected to the positive and negative poles of the battery cell. A portion of the pole piece 200 is located between the pole fixing assembly 300 and the cover body 100, which is conducive to improving the structural stability of the battery cover assembly.

[0056] Figure 4 A partial structural cross-sectional view of a battery cover assembly provided by an embodiment of the utility model is shown; Figure 5 The schematic diagram of the structure of the pole member provided by the embodiment of the utility model is shown. Figure 3-Figure 5 The pole piece 200 includes a pole body 210 and a protrusion 220, and the protrusion 220 is arranged around the circumference of the pole body 210. Preferably, in this embodiment, the pole body 210 and the protrusion 220 are integrally formed. Compared with a split pole connected by welding, the pole piece 200 provided in this embodiment can effectively increase the current conduction area.

[0057] As an embodiment, the orthographic projection of the protrusion 220 on the cover body 100 can completely cover the pole through hole 110. Due to the setting of the protrusion 220, the pole piece 200 can be effectively prevented from moving into the battery. However, under the action of external force, the pole piece 200 is easy to fall out of the pole through hole 110. By setting a pole fixing assembly 300, the pole fixing assembly 300 includes a pressing portion 310, and the protrusion 220 is located between the pressing portion 310 and the cover body 100, which can effectively prevent the pole piece 200 from falling out of the pole through hole 110. The cover body 100 and the pressing portion 310 simultaneously form upper and lower limits for the protrusion 220 along the central axis direction of the pole piece 200, thereby ensuring the structural integrity and structural stability of the battery cover assembly.

[0058] The first insulating component 500 is arranged on the side of the cover body 100 away from the battery cell. As one of the implementation methods of this embodiment, the first insulating component 500 is arranged around the circumference of the pole piece 200, wrapping a portion of the pole fixing component 300. On the one hand, it can effectively achieve insulation between the pole fixing component 300 and the pole piece 200, and insulation between the pole fixing component 300 and the cover body 100. On the other hand, it can also effectively improve the overall stability of the battery cover assembly.

[0059] The second insulating component 600 is disposed on the side of the cover body 100 facing the battery cell, and the sealing component 400 abuts against the second insulating component 600. The second insulating component 600 can ensure the insulation performance of the positions other than the pole piece 200, and further improve the sealing performance of the pole through hole 110 by abutting against the sealing component 400.

[0060] Figure 6 A schematic diagram showing the structure of a pole fixing assembly provided by an embodiment of the utility model is shown; Figure 7 The cross-sectional view of the pole fixing assembly provided by the embodiment of the utility model is shown. Figure 4-Figure 7 The pole fixing assembly 300 is annular in structure, and an avoidance hole is provided along the central axis direction thereof, and the avoidance hole is specifically for the pole body 210 to pass through. The pole fixing assembly 300 specifically includes a pressing portion 310, a clamping portion 320 and a connecting portion 330. The connecting portion 330 is a hollow cylindrical structure, forming the above-mentioned avoidance hole. One end of the connecting portion 330 extends toward the central axis direction of the pole fixing assembly 300 to form a pressing portion 310. The pressing portion 310 is embedded in the first insulating assembly 500, and its projection in the vertical direction partially overlaps with the projection of the protrusion 220 in the vertical direction. The protrusion 220 and at least part of the first insulating assembly 500 can be pressed against the cover plate body 100 by the pressing portion 310 to achieve the positioning of the pole member 200.

[0061] Specifically, an annular boss 111 is provided around the inner wall of the pole through hole 110. Figure 4 As shown. The upper end surface of the annular boss 111 is lower than the upper end surface of the cover body 100 away from the battery cell, forming a step structure. The protrusion 220 abuts against the annular boss 111. It can be understood that the abutment here is that the protrusion and the annular boss abut through an intermediate structure, such as the protrusion 220 and the annular boss 111 abut through an insulating member sandwiched in the middle.

[0062] More specifically, refer to Figure 4 , at least part of the sealing assembly 400 is sandwiched between the side of the annular boss 111 facing away from the battery cell and the protrusion 220; and / or, at least part of the sealing assembly 400 is sandwiched between the side of the annular boss 111 and the pole body 210.

[0063] In the present embodiment, the sealing assembly 400 includes a first sealing portion 410 and a second sealing portion 420 arranged at an angle. The first sealing portion 410 is axially clamped between the upper end surface of the annular boss 111 and the lower end surface of the protrusion 220 to improve the sealing performance at the contact position between the protrusion 220 and the annular boss 111. The second sealing portion 420 is radially clamped between the side of the annular boss 111 and the peripheral side of the pole body 210 to improve the sealing performance at the contact position between the peripheral side of the pole body 210 and the annular boss 111. In the present embodiment, the angle between the first sealing portion 410 and the second sealing portion 420 is a right angle to match the shape of the annular boss 111. The sealing assembly 400 can prevent foreign substances from entering the battery housing 1 and prevent electrolyte from seeping out.

[0064] It should be noted that the first sealing portion 410 and the second sealing portion 420 may be provided as separate bodies. During installation, it is necessary to ensure that the first sealing portion 410 and the second sealing portion 420 are closely abutted against each other. In order to further improve the sealing performance, in this embodiment, the first sealing portion 410 and the second sealing portion 420 are preferably an integral structure that is fixedly connected to each other.

[0065] Figure 8 A partial structural cross-sectional view of a cover body provided by an embodiment of the utility model is shown, referring to Figure 4 and Figure 6-Figure 8 The end of the connecting portion 330 away from the pressing portion 310 is formed with a clamping portion 320. The cover body 100 is provided with a clamping groove 120 corresponding to the outer circumferential side of the pole through hole 110, and the clamping portion 320 can be clamped in the clamping groove 120. In this embodiment, the clamping portion 320 is specifically an annular structure, which extends toward the central axis direction of the pole fixing assembly 300. Correspondingly, the clamping groove 120 is an annular groove structure to realize the integral embedding of the annular clamping portion 320.

[0066] Specifically, a protruding structure 130 is provided on the inner wall of the card slot 120 close to the pole body 210. The height of the protruding structure 130 in the vertical direction is slightly lower than the upper end surface of the cover body 100. Along the direction close to the central axis of the pole fixing assembly 300, the height of the upper end surface of the clamping portion 320 gradually decreases to form an inclined upper end surface. The side of the protruding structure 130 facing the card slot 120 is an inclined pressing surface 131, and along the direction away from the card slot 120, the height of the inclined pressing surface 131 gradually decreases. The shape of the above-mentioned inclined pressing surface 131 matches the inclined upper end surface of the clamping portion 320, and can stably press against the upper end surface of the clamping portion 320. Through the above-mentioned arrangement, the connection reliability between the clamping portion 320 and the cover body 100 can be improved, and the accident of separation of the pole fixing assembly 300 and the cover body 100 due to external force can be avoided.

[0067] Fig. 9 A partial structural cross-sectional view of a cover plate body provided by another embodiment of the present invention is shown. Fig. 9 In another embodiment, the upper end surface of the clamping portion 320 is parallel to the cover body 100, and the protruding structure 130 extends toward the clamping slot 120 to form a pressing platform 132 parallel to the cover body 100. The upper end surface of the clamping portion 320 is parallel to the cover body 100, and the pressing surface of the pressing platform 132 is parallel to the cover body 100 and can press against the upper end surface of the clamping portion 320.

[0068] That is to say, the protruding structure 130 is capable of pressing and fixing the clamping portion 320 , and the specific structure thereof is not limited in this embodiment.

[0069] The back surface 321 of the pole fixing assembly 300 abuts against the cover body 100 .

[0070] Specifically, the card slot 120 limits the card-mounting portion 320 from at least four directions, such as Figure 4-8 As shown, the two pressing surfaces of the bottom groove wall, the two side groove walls, and the inclined pressing surface 131 or the pressing platform 132 of the card slot 120 limit the position of the card slot 320.

[0071] Continue to refer to Figure 2-Figure 4 As one of the implementation modes of this embodiment, the first insulating component 500 is specifically arranged around the circumference of the pole body 210, and can be in contact with the side of the cover body 100 away from the battery cell. The first insulating component 500 is provided with an annular groove on the side facing the cover body 100, and a part of the pressing part 310 and the connecting part 330 of the pole fixing component 300 can be embedded in the annular groove. A part of the first insulating component 500 located on the side of the connecting part 330 away from the central axis of the pole fixing component 300 is tightly pressed against the cover body 100; a part of the first insulating component 500 located on the side of the connecting part 330 close to the central axis of the pole fixing component 300 is sandwiched between the pole piece 200 and the pole fixing component 300. Specifically, the first insulating component 500 can fill the space between the pressing portion 310, part of the cover body 100 at the corresponding position below the pressing portion 310, the side of the pole body 210 facing the connecting portion 330, the side of the connecting portion 330 facing the pole body 210, and a portion of the first sealing portion 410 above the annular boss 111 that is not overlapped, and the first insulating component 500 can abut against the first sealing portion 410, thereby ensuring the sealing performance and insulation performance.

[0072] Continue to refer to Figure 3 and Figure 4The size of the second insulating component 600 is basically matched with the cover body 100, and it is arranged on the side of the cover body 100 facing the battery cell. The second insulating component 600 is provided with a perforation hole 610 corresponding to the position of the pole through hole 110, and the pole member 200 is electrically connected to the battery cell through the perforation hole 610. The second insulating component 600 can ensure the insulation performance of the position other than the pole member 200, and can abut against the lower end of the second sealing portion 420, thereby ensuring the sealing performance.

[0073] Continue to refer to Figure 1-Figure 3 The cover body 100 is provided with a liquid injection hole 140 and an explosion-proof hole 150 at intervals. The explosion-proof hole 150 is mainly used to install the explosion-proof component 700. The cover body 100 is also provided with a liquid guide groove, which is at least partially located between the explosion-proof hole 150 and the liquid injection hole 140.

[0074] Specifically, the explosion-proof assembly 700 includes an explosion-proof valve 710, an explosion-proof disc 720, and a protective film 730. The explosion-proof valve 710 is disposed in the explosion-proof hole 150, the explosion-proof disc 720 is disposed in the explosion-proof valve 710, and the protective film 730 covers the explosion-proof hole 150. When electrolyte overflows from the battery housing 1, the overflowed electrolyte will flow into the liquid guide groove to prevent the electrolyte from entering the explosion-proof hole 150, thereby preventing the electrolyte from corroding the explosion-proof disc 720 and causing the explosion-proof disc 720 to fail.

[0075] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Battery cover assembly, characterized in that: include: A cover plate body (100), wherein the cover plate body (100) is provided with a pole through hole (110); A pole piece (200) is disposed through the pole through hole (110); A sealing assembly (400), wherein a portion of the sealing assembly (400) is sandwiched between an inner wall of the pole through hole (110) and the pole member (200); A first insulating component (500), the first insulating component (500) being arranged on a side of the cover body (100) facing away from the battery cell; A second insulating component (600), the second insulating component (600) being arranged on a side of the cover body (100) facing the battery core; A pole fixing assembly (300) is clamped on a side of the cover body (100) facing away from the battery core, and a portion of the pole piece (200) is located between the pole fixing assembly (300) and the cover body (100); The pole fixing assembly (300) comprises a pressing portion (310) and a clamping portion (320), and the clamping portion (320) and the pressing portion (310) have the same length extension direction; The cover plate body (100) is provided with a slot (120) on the circumferential outer side of the pole through hole (110), and the clamping portion (320) is clamped in the slot (120); The back surface (321) of the pole fixing assembly (300) abuts against the cover plate body (100).

2. The battery cover assembly according to claim 1, characterized in that: A protruding structure (130) is provided on the inner wall of the clamping slot (120) close to the pole piece (200), and the height of the upper end surface of the clamping portion (320) gradually decreases along the direction close to the central axis of the pole fixing assembly (300), and the side of the protruding structure (130) facing the clamping slot (120) is an inclined pressing surface (131), and the inclined pressing surface (131) presses against the upper end surface of the clamping portion (320).

3. The battery cover assembly according to claim 1, characterized in that: A protruding structure (130) is provided on one side of the clamping slot (120) close to the pole piece (200); the upper end surface of the clamping portion (320) is parallel to the cover plate body (100); the protruding structure (130) extends toward the clamping slot (120) and parallel to the cover plate body (100) to form a pressing platform (132); the pressing platform (132) presses against the upper end surface of the clamping portion (320).

4. The battery cover assembly according to claim 1, characterized in that: The pole piece (200) comprises a pole body (210) and a protruding portion (220), wherein the protruding portion (220) is arranged around the circumference of the pole body (210); The protruding portion (220) is located between the pressing portion (310) and the cover plate body (100).

5. The battery cover assembly according to claim 4, characterized in that: An annular boss (111) is provided on the inner wall of the pole through hole (110), and the protruding portion (220) abuts against the annular boss (111).

6. The battery cover assembly according to claim 5, characterized in that: At least part of the sealing assembly (400) is sandwiched between a side of the annular boss (111) facing away from the battery core and the protrusion (220); and / or, At least part of the sealing assembly (400) is sandwiched between the side of the annular boss (111) and the pole body (210); and / or The sealing component (400) abuts against the second insulating component (600).

7. The battery cover assembly according to claim 6, characterized in that: The sealing assembly (400) comprises a first sealing portion (410) and a second sealing portion (420); the first sealing portion (410) is axially clamped between a side of the annular boss (111) facing away from the battery cell and the protruding portion (220); the second sealing portion (420) is radially clamped between a side of the annular boss (111) and the pole body (210); the first sealing portion (410) and the second sealing portion (420) are fixedly connected to or abut against each other.

8. The battery cover assembly according to any one of claims 1 to 7, characterized in that: The second insulating component (600) is provided with a penetration hole (610) at a position corresponding to the pole through hole (110), and the pole member (200) is electrically connected to the battery core through the penetration hole (610).

9. A battery, characterized in that It comprises a battery cell and a battery casing (1), and also comprises a battery cover assembly as described in any one of claims 1 to 8, wherein the cover body (100) is sealed at the opening of the battery casing (1), and the pole piece (200) is connected to the battery cell.

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