Battery cover plate and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises a cover plate body and a pole column assembly, the cover plate body is provided with a pole column through hole, the pole column assembly comprises an upper pole body, a lower pole body and a connecting pole body which are all solid bodies, and the connecting pole body is arranged in the pole column through hole in a penetrating mode. The upper pole body is connected to the first end, located outside the cover plate body, of the connecting pole body, the second end of the connecting pole body is connected with the lower pole body, and the connecting area is larger than or equal to the end face area of the second end. By adopting the split type pole composed of the upper pole body, the lower pole body and the connecting pole body, the pole does not need to be riveted, so that the assembling yield is improved, the upper pole body, the lower pole body and the connecting pole body are all of a solid structure, and the connecting mode of the connecting pole body and the lower pole body is controlled, so that the assembling efficiency is improved. The connection area of the first end and the second end is larger than or equal to the end face area of the second end, so that the contact area is enlarged, the current conduction area is increased, and the current conduction capacity is improved.

Description

Technical Field

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

[0002] A battery generally includes a battery cover plate, a battery housing and an electric core. The battery housing is a housing structure with one side open. By covering the battery cover plate on the open port of the battery housing, a accommodating space is formed. The electric core is arranged in the accommodating space, and electrolyte is injected into the accommodating space.

[0003] For a battery cover plate with functions of fixing and sealing, current conduction, pressure relief and fusing protection, during assembly, the pole column and the riveting block are usually assembled by riveting. By applying pressure to the pole column, the pole column is deformed, so as to realize the connection with the riveting block. However, during the riveting process, the deformation of the pole column is uncontrollable, resulting in a low yield rate of products.

[0004] In order to improve this situation, a split pole column is generally used to replace the riveted pole column for assembly. However, in order to facilitate connection, the split pole column will inevitably lose a part of the current conduction area, resulting in weak current conduction ability.

[0005] Therefore, there is an urgent need for a battery cover plate and a battery to solve the above problems. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a battery cover plate and a battery, which have a large current conduction area, strong current conduction ability and high assembly yield rate.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions:

[0008] On the one hand, a battery cover plate is provided, which includes:

[0009] A cover plate body, on which a pole column through hole is opened;

[0010] A pole column assembly, which includes an upper pole body, a lower pole body and a connecting pole body that are all solid. The connecting pole body penetrates through the pole column through hole. The upper pole body is connected to the first end of the connecting pole body located outside the cover plate body. The second end of the connecting pole body is connected to the lower pole body, and it satisfies that: the connection area is greater than or equal to the end face area of the second end;

[0011] A sealing assembly, which is arranged between the pole column assembly and the cover plate body, and is used for sealing the battery to prevent the electrolyte from flowing out and also prevent substances outside the battery from entering the battery and affecting the performance of the battery;

[0012] An insulating component is provided on both sides of the cover body to insulate the pole column component from the cover body.

[0013] Optionally, the end face of the second end of the connecting pole body is connected to the surface of the lower pole body. At this time, the connection area between the second end of the connecting pole body and the lower pole body is equal to the end face area of the second end.

[0014] Optionally, in the end face of the connecting pole body facing the lower pole body and the surface of the lower pole body facing the connecting pole body, a connecting groove is formed on one of them, and a connecting protrusion is provided on the other. The connecting protrusion is inserted and matched with the connecting groove. At this time, the connection area between the second end of the connecting pole body and the lower pole body is larger than the end face area of the second end.

[0015] Optionally, the depth of the connecting groove is less than the height of the connecting pole body.

[0016] Optionally, the cross-section of the connecting pole body is non-circular, and the cross-sectional shape of the pole column through-hole is the same as the cross-sectional shape of the connecting pole body.

[0017] Optionally, the orthographic projection area of the upper pole body on the cover body is larger than the area of the pole column through-hole;

[0018] and / or,

[0019] The orthographic projection area of the lower pole body on the cover body is larger than the area of the pole column through-hole.

[0020] Optionally, the connecting pole body is integrally formed or welded with the upper pole body;

[0021] The connecting pole body is welded to the lower pole body.

[0022] Optionally, the sealing component includes:

[0023] A first seal, which is clamped between the cover body and the lower pole body;

[0024] A second seal, which is clamped between the inner wall of the pole column through-hole and the outer wall of the connecting pole body;

[0025] A third seal, which is clamped between the cover body and the upper pole body.

[0026] Optionally, the second seal is integrally formed with any one of the first seal or the third seal;

[0027] Alternatively, the second seal includes a first part and a second part. The first part and the second part are arranged axially along the pole post through-hole and are in contact with each other. The first part is integrally formed with the first seal, and the second part is integrally formed with the second seal;

[0028] Alternatively, the first seal, the second seal, and the third seal are integrally formed.

[0029] Optionally, the insulation assembly includes:

[0030] an upper insulation member disposed on one side of the cover body facing the upper pole body;

[0031] a lower insulation member partially disposed between the cover body and the lower pole body.

[0032] On the other hand, a battery is also provided. The battery includes the battery cover as described above, and the battery further includes a battery housing and an electric core. The battery cover is disposed on the battery housing to form a storage space for placing the electric core.

[0033] Advantages of the present utility model:

[0034] The present utility model provides a battery cover. By adopting a split-type pole post composed of an upper pole body, a lower pole body, and a connecting pole body, the present battery cover does not require riveting of the pole post, avoiding uncontrollable deformation during the riveting process, thereby improving the yield rate of assembly. Moreover, the upper pole body, the lower pole body, and the connecting pole body all adopt solid structures, and by controlling the connection method between the connecting pole body and the lower pole body, the connection area between the two is made greater than or equal to the end face area of the second end, thereby expanding the contact area between the lower pole body and the connecting pole body, increasing the current conduction area, and improving the current conduction ability.

[0035] The present utility model also provides a battery. By applying the above battery cover, the battery has a stronger current conduction ability and improves the power supply performance of the battery. Description of the Drawings

[0036] Figure 1 is an exploded view of the structure of the battery cover provided by the present utility model;

[0037] Figure 2 is a cross-sectional view of the battery cover provided by the present utility model;

[0038] Figure 3 is a structural exploded view of the pole post assembly in the battery cover provided by the present utility model;

[0039] Figure 4 is a connection schematic diagram of the upper pole body and the connecting pole body in the battery cover provided by the present utility model;

[0040] Figure 5 It is a three-dimensional structural view of the battery provided by the present utility model.

[0041] In the figure:

[0042] 1. Cover body; 11. Pole post through hole; 12. Mounting hole; 13. Liquid injection hole;

[0043] 2. Pole post assembly; 21. Upper pole body; 22. Lower pole body; 221. Connecting protrusion; 23. Connecting pole body; 231. Connecting groove; 232. Cutting surface; 233. Arc surface;

[0044] 3. Explosion-proof valve;

[0045] 4. Sealing assembly; 41. First seal; 42. Second seal; 43. Third seal;

[0046] 5. Insulating assembly; 51. Upper insulating part; 511. Placing groove; 512. First through hole; 52. Lower insulating part; 521. Second through hole; 522. Explosion-proof through hole; 523. Liquid injection through hole;

[0047] 6. Battery housing. Detailed implementation manners

[0048] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0049] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0050] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0051] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0052] A battery generally includes a battery cover plate, a battery housing and an electrode core. The battery housing is a housing structure with an open side. By covering the battery cover plate on the open portion of the battery housing, a storage space is formed. The electrode core is disposed in the storage space, and electrolyte is injected into the storage space.

[0053] The battery cover plate having functions of fixing and sealing, current conduction, pressure relief and fuse protection is usually assembled by riveting the pole column and the riveting block. By applying pressure to the pole column, the pole column is deformed to achieve connection with the riveting block. However, during the riveting process, the deformation of the pole column is uncontrollable, resulting in a low yield rate of the product.

[0054] To improve this situation, generally a split pole column is used to replace the riveted pole column for assembly. However, in order to facilitate connection, the split pole column will inevitably lose a part of the current conduction area, resulting in weak current conduction ability.

[0055] Therefore, in order to improve the current conduction area and enhance the current conduction ability on the premise of ensuring the yield rate of product assembly, this embodiment provides a battery cover plate.

[0056] Such as Figures 1 to 4As shown, the battery cover plate includes a cover plate body 1 and a pole assembly 2. A pole through hole 11 is formed in the cover plate body 1. The pole assembly 2 includes an upper pole body 21, a lower pole body 22, and a connecting pole body 23 that are all solid. The connecting pole body 23 passes through the pole through hole 11. The upper pole body 21 is connected to the first end of the connecting pole body 23 located outside the cover plate body 1. The second end of the connecting pole body 23 is connected to the lower pole body 22, and it satisfies that the connection area is greater than or equal to the end face area of the second end.

[0057] By adopting a split pole composed of the upper pole body 21, the lower pole body 22, and the connecting pole body 23, the battery cover plate does not require riveting of the pole, avoiding uncontrollable deformation during the riveting process, thereby improving the yield rate of assembly. Moreover, the upper pole body 21, the lower pole body 22, and the connecting pole body 23 all adopt solid structures, and by controlling the connection method between the connecting pole body 23 and the lower pole body 22, the connection area between the two is made greater than or equal to the end face area of the second end, thereby expanding the contact area between the lower pole body 22 and the connecting pole body 23, increasing the current conduction area, and improving the current conduction ability.

[0058] In one embodiment, the lower pole body 22 is a plate-like structure with the same thickness everywhere. The plate-like structure can be a polygon or a circle, and the shape of the plate-like structure is not limited in this application. The end face of the second end of the connecting pole body 23 is connected to the surface of the lower pole body 22. At this time, the connection area between the second end of the connecting pole body 23 and the lower pole body 22 is equal to the end face area of the second end.

[0059] In one embodiment, in order to improve the protection performance of the battery, the battery cover plate further includes an explosion-proof valve 3. An installation hole 12 for placing the explosion-proof valve 3 is also formed in the cover plate body 1. In addition, in order to facilitate the injection of electrolyte, a liquid injection hole 13 for injecting electrolyte is also formed in the cover plate body 1.

[0060] Optionally, as Figure 2 、 Figure 4 shown, in the end face of the second end of the connecting pole body 23 facing the lower pole body 22 and the surface of the lower pole body 22 facing the connecting pole body 23, a connecting groove 231 is formed on one of them, and a connecting protrusion 221 is provided on the other. The connecting protrusion 221 is in plug-in fit with the connecting groove 231. At this time, the connection area between the second end of the connecting pole body 23 and the lower pole body 22 is greater than the end face area of the second end.

[0061] By the mutual plugging of the plugging protrusion and the plugging groove, the contact area between the connecting pole body 23 and the lower pole body 22 is increased, a larger current conduction area is obtained, and the current conduction ability is improved.

[0062] In this embodiment, the connecting groove 231 is opened at one end of the connecting pole body 23 away from the upper pole body 21, and the connecting protrusion 221 is arranged on the lower pole body 22. Among them, the connecting protrusion 221 and the connecting groove 231 for increasing the contact area between the lower pole body 22 and the connecting pole body 23 can be of various different structures. In this embodiment, the connecting protrusion 221 is a cylinder, and the connecting groove 231 is a circular groove.

[0063] In other embodiments, the connecting protrusion 221 can be a column with serrations on its outer periphery, and the connecting groove 231 can be a serrated groove.

[0064] Optionally, as Figure 2 shown, the depth of the connecting groove 231 is less than the height of the connecting pole body 23. By making the height of the connecting pole body 23 greater than the depth of the connecting groove 231, the structural strength of the connecting pole body 23 is ensured even after grooving.

[0065] Optionally, as Figure 4 shown, the cross-section of the connecting pole body 23 is non-circular, and the cross-section shape of the pole post through-hole 11 is the same as that of the connecting pole body 23. By setting the cross-section of the connecting pole body 23 to be non-circular, the connecting pole body 23 and the pole post through-hole 11 of the corresponding shape cooperate with each other to achieve the effect of limiting rotation.

[0066] In this embodiment, the connecting pole body 23 is a columnar structure with at least one cut surface 232, and the pole post through-hole 11 is provided with a limiting surface corresponding to the cut surface 232 one by one, and the limiting surface abuts against the cut surface 232. By setting the cut surface 232 on the connecting pole body 23 and the limiting surface abutting against the cut surface 232 on the pole post through-hole 11, the effect of limiting the rotation of the connecting pole body 23 is achieved.

[0067] The number of cut surfaces 232 on the connecting pole body 23 can be freely set according to requirements. In this embodiment, two opposite cut surfaces 232 are provided on the connecting pole body 23. Therefore, two limiting surfaces are provided on the pole post through-hole 11 for corresponding thereto. Since the connecting pole body 23 is a column, two cut surfaces 232 and two arc surfaces 233 are provided on the outer periphery of the connecting pole body 23. Among them, although the upper pole body 21 and the connecting pole body 23 are manufactured by an integral molding process, the shape of the upper pole body 21 can be the same as or different from that of the connecting pole body 23.

[0068] In other embodiments, three cut surfaces 232 can also be provided on the connecting pole body 23. Therefore, three limiting surfaces are provided on the pole post through-hole 11 for corresponding thereto, so as to improve the strength of limiting rotation.

[0069] Optionally, as Figure 2As shown, the orthographic projection area of the upper pole body 21 on the cover plate body 1 is larger than the area of the pole post through hole 11. By making the orthographic projection area of the upper pole body 21 on the cover plate body 1 larger than the area of the pole post through hole 11, the upper pole body 21 abuts against the cover plate body 1, playing a role in limiting the connecting pole body 23 connected to the upper pole body 21, and realizing the connection between the pole post assembly 2 and the cover plate body 1. In addition, when the pole post assembly 2 is pressed by an external force, the upper pole body 21 can prevent the pole post assembly 2 from denting into the battery interior, improving the connection reliability of the pole post assembly 2.

[0070] Optionally, as Figure 2 shown, the orthographic projection area of the lower pole body 22 on the cover plate body 1 is larger than the area of the pole post through hole 11. By making the orthographic projection area of the lower pole body 22 on the cover plate body 1 larger than the area of the pole post through hole 11, the lower pole body 22 abuts against the cover plate body 1, playing a role in limiting the connecting pole body 23 connected to the lower pole body 22, and realizing the connection between the pole post assembly 2 and the cover plate body 1. In addition, when the pole post assembly 2 is pulled by an external force, the lower pole body 22 can prevent the pole post assembly 2 from falling out and detaching from the pole post through hole 11 through cooperation with the cover plate body 1, improving the connection reliability of the pole post assembly 2.

[0071] Optionally, the connecting pole body 23 is integrally formed or welded with the upper pole body 21, and the connecting pole body 23 is welded to the lower pole body 22. By manufacturing the upper pole body 21 and the connecting pole body 23 using an integral forming process, the number of components is reduced, improving the assembly convenience. The separately formed lower pole body 22 is in a plate-like structure, facilitating connection with the connecting pole body 23. And the projection area of the lower pole body 22 is larger than the projection area of the connecting pole body 23, facilitating the connection between the lower pole body 22 and the connecting pole body 23. Among them, the lower pole body 22 and the connecting pole body 23 are connected as a whole by welding. On the one hand, it ensures the current conduction between the upper pole body 21, the lower pole body 22, and the connecting pole body 23. On the other hand, it improves the overall structural strength of the pole post assembly 2.

[0072] Optionally, as Figures 1 to 2 shown, the battery cover plate further includes a sealing assembly 4. The sealing assembly 4 is arranged between the pole post assembly 2 and the cover plate body 1, used for sealing the battery, preventing the electrolyte from flowing out, and also preventing substances outside the battery from entering the battery and affecting the battery performance. The sealing assembly 4 includes a first sealing member 41, a second sealing clip, and a third sealing member 43. The first sealing member 41 is clamped between the cover plate body 1 and the lower pole body 22, the second sealing member 42 is clamped between the inner wall of the pole post through hole 11 and the outer wall of the connecting pole body 23, and the third sealing member 43 is clamped between the cover plate body 1 and the upper pole body 21.

[0073] As one of the preferred embodiments, by sleeving the first seal 41 outside the connecting pole body 23 and arranging it between the cover plate body 1 and the lower pole body 22, a first insulating seal is formed between the lower pole body 22 and the cover plate body 1. By sleeving the second seal 42 outside the connecting pole body 23 and arranging it between the inner wall of the pole hole 11 and the outer wall of the connecting pole body 23 to form a second insulating seal, and by sleeving the third seal 43 on the connecting pole body 23 and arranging it between the cover plate body 1 and the upper pole body 21 to form a third insulating seal. Thus, the insulating and sealing performance of the battery cover plate is improved by using these three insulating seals, and the quality of the battery cover plate is improved.

[0074] In this embodiment, the first seal 41, the second seal 42, and the third seal 43 can be made of the same material, or can be made of three different materials with gradually increasing sealing performance. In a step-by-step improvement manner, the sealing performance is enhanced and the cost is reduced.

[0075] Optionally, as Figures 1 to 2 shown, the second seal 42 is integrally formed with either the first seal 41 or the third seal 43. By manufacturing the sealing assembly 4 in a way that part of the structure is integrally formed, the number of components is reduced, and the convenience during assembly is improved.

[0076] In this embodiment, the first seal 41 and the second seal 42 are manufactured by an integrally formed process, and the third seal 43 is manufactured separately.

[0077] Optionally, the second seal 42 includes a first part and a second part. The first part and the second part are arranged along the axial direction of the pole hole 11 and are in contact with each other. The first part is integrally formed with the first seal 41, and the second part is integrally formed with the second seal 42. Thus, the unilateral cross-section of the first seal 41 and the third seal 43 is L-shaped. When the first structure and the second structure are in contact, the unilateral cross-sections of the first seal 41 and the third seal 43 together form a C-shaped.

[0078] Optionally, the first seal 41, the second seal 42, and the third seal 43 are integrally formed. By manufacturing the sealing assembly 4 in an integrally formed way, the number of components is reduced, and the convenience during assembly is improved.

[0079] Optionally, as Figures 1 to 2 shown, the battery cover plate further includes an insulating assembly 5. The insulating assembly 5 is arranged on both sides of the cover plate body 1 to achieve insulation between the pole assembly 2 and the cover plate body 1. The insulating assembly 5 includes an upper insulating member 51 and a lower insulating member 52. The upper insulating member 51 is arranged on the side of the cover plate body 1 facing the upper pole body 21, and the lower insulating member 52 is partially clamped between the cover plate body 1 and the lower pole body 22.

[0080] As a preferred embodiment, the upper insulating member 51 is provided with a placement groove 511 and a first through hole 512 connected to the pole through hole 11. The upper pole body 21 is arranged in the placement groove 511, and the connecting pole body 23 is inserted in the first through hole 512. The lower insulating member 52 is provided with a second through hole 521 connected to the pole through hole 11. The connecting pole body 23 passes through the second through hole 521 and is connected to the lower pole body 22.

[0081] By providing the upper insulating member 51 and the lower insulating member 52, the insulation performance of the battery cover is improved and the safety is improved. In one embodiment, the upper insulating member 51 is a ring structure with a placement groove 511, and the lower insulating member 52 is a plate-like structure attached to the cover body 1, and is provided with an explosion-proof through hole 522 and a liquid injection through hole 523 corresponding to the explosion-proof valve 3 and the liquid injection hole 13 on the cover body 1.

[0082] In this embodiment, the upper insulating member 51 and the lower insulating member 52 are both made of plastic.

[0083] In this embodiment, if Figure 5 As shown, a battery is also provided, which includes the above-mentioned battery cover, and the battery also includes a battery shell 6 and a battery cell. The battery cover is arranged on the battery shell 6 to form a storage space for placing the battery cell.

[0084] By applying the above-mentioned battery cover, the battery has a stronger current conducting capability, thereby improving the power supply performance of the battery.

[0085] When assembling the battery cover in this embodiment, since the upper pole body 21 and the connecting pole body 23 are an integrally formed structure, the upper pole body 21 is placed in the placement groove 511 of the upper insulating member 51, and the connecting pole body 23 is passed through the first through hole 512, and then the third sealing member 43 is sleeved on the outside of the connecting pole body 23, and then the connecting pole body 23 is inserted into the pole through hole 11 of the cover body 1. At this time, the third sealing member 43 is sandwiched between the upper insulating member 51 and the cover body 1, and then the lower insulating member 52 is attached to the cover body 1 away from the upper pole body 2 1, and the connecting pole body 23 is inserted into the second through hole 521, then the first sealing member 41 and the second sealing member 42 formed in one piece are sleeved on the outside of the connecting pole body 23, and the second sealing member 42 is inserted into the gap between the connecting pole body 23 and the pole through hole 11, the connecting protrusion 221 of the lower pole body 22 is inserted into the connecting groove 231 of the connecting pole body 23, and the lower pole body 22 and the connecting pole body 23 are welded, and finally the explosion-proof valve 3 is installed in the mounting hole 12 on the cover body 1, thereby completing the assembly operation of the battery cover.

[0086] Finally, the battery cell is placed into the battery housing 6, the battery cover plate is covered on the battery housing 6, and electrolyte is injected through the liquid injection hole 13 on the battery cover plate to complete the assembly of the battery.

[0087] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A battery cover, characterized in that: The battery cover comprises: A cover plate body (1), wherein a pole through hole (11) is provided on the cover plate body (1); A pole assembly (2), the pole assembly (2) comprising an upper pole body (21), a lower pole body (22) and a connecting pole body (23), all of which are solid; the connecting pole body (23) is inserted into the pole through hole (11); the upper pole body (21) is connected to a first end of the connecting pole body (23) located outside the cover plate body (1); the second end of the connecting pole body (23) is connected to the lower pole body (22), and the following conditions are satisfied: a connection area is greater than an end surface area of ​​the second end; A sealing assembly (4) is arranged between the pole assembly (2) and the cover plate body (1); Insulation components (5) are arranged on both sides of the cover body (1) to achieve insulation between the pole component (2) and the cover body (1); A connecting groove (231) is provided on one of the end surface of the second end of the connecting electrode body (23) and the surface of the lower electrode body (22) facing the connecting electrode body (23), and a connecting protrusion (221) is provided on the other, and the connecting protrusion (221) is plugged into and matched with the connecting groove (231).

2. The battery cover according to claim 1, characterized in that: The depth of the connecting groove (231) is smaller than the height of the connecting pole body (23).

3. The battery cover according to claim 1, characterized in that: The cross-section of the connecting pole body (23) is non-circular, and the cross-section shape of the pole through hole (11) is consistent with the cross-section shape of the connecting pole body (23).

4. The battery cover according to claim 1, characterized in that: The orthographic projection area of ​​the upper pole body (21) on the cover plate body (1) is larger than the area of ​​the pole through hole (11); and / or, The orthographic projection area of ​​the lower pole body (22) on the cover plate body (1) is larger than the area of ​​the pole through hole (11).

5. The battery cover according to claim 1, characterized in that: The connecting pole body (23) and the upper pole body (21) are integrally formed or welded; The connecting pole body (23) is welded to the lower pole body (22).

6. The battery cover according to claim 1, characterized in that: The sealing assembly (4) comprises: A first sealing member (41), the first sealing member (41) being sandwiched between the cover plate body (1) and the lower pole body (22); A second sealing member (42), the second sealing member (42) being sandwiched between the inner wall of the pole through hole (11) and the outer wall of the connecting pole body (23); A third sealing member (43), wherein the third sealing member (43) is sandwiched between the cover plate body (1) and the upper pole body (21).

7. The battery cover according to claim 6, characterized in that: The second sealing member (42) is integrally formed with either the first sealing member (41) or the third sealing member (43); Or, the second sealing member (42) comprises a first part and a second part, the first part and the second part are arranged along the axial direction of the pole through hole (11) and abut against each other, the first part and the first sealing member (41) are integrally formed, and the second part and the second sealing member (42) are integrally formed; Alternatively, the first sealing member (41), the second sealing member (42) and the third sealing member (43) are integrally formed.

8. The battery cover according to claim 1, characterized in that: The insulating component (5) comprises: An upper insulating member (51), the upper insulating member (51) being arranged on a side of the cover plate body (1) facing the upper pole body (21); A lower insulating member (52), wherein the lower insulating member (52) is partially disposed between the cover plate body (1) and the lower pole body (22).

9. A battery, characterized in that The battery comprises a battery cover as claimed in any one of claims 1 to 8, and further comprises a battery housing (6) and a battery cell, wherein the battery cover is arranged on the battery housing (6) to form a storage space for placing the battery cell.

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