Battery cover plate, battery and battery pack

Abstract

The utility model relates to the technical field of battery manufacturing, and discloses a battery cover plate, a battery and a battery pack, the battery comprises: a cover plate provided with an opening; the sealing plate is connected with the cover plate and seals and covers the opening; one of the insulating plate and the sealing plate is provided with a boss, the other one of the insulating plate and the sealing plate is provided with a groove, and the boss is inserted into the groove; each pole assembly comprises a pole and a connecting piece, the pole is arranged on the cover plate, the connecting piece is connected to the pole, the connecting piece is located on the side, opposite to the sealing plate, of the insulating plate, and a tab space is defined between the connecting piece and the insulating plate. The battery cover plate disclosed by the utility model not only can be used for conveniently connecting the tabs and the connecting pieces of the battery, but also can be used for improving the space utilization rate of the battery, and has the advantage of good insulating property.

Description

Technical Field

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

[0002] Batteries in related technologies usually need to weld the connecting piece to the tab, and the connecting piece and the tab are usually welded outside the battery shell to avoid interference of the battery shell on the welding. In some processing technologies, in order to facilitate welding, a through hole is opened on the battery shell to expose the connecting piece and the tab, and then welded, and then the through hole is covered by a sealing plate, which is easy to short-circuit between the sealing plate and the tab. Utility Model Content

[0003] In view of this, the utility model provides a battery and a battery pack having the same to solve the problem of easy short circuit between the sealing plate and the tab.

[0004] In the first aspect, the utility model provides a battery cover, comprising: a cover, the cover is provided with an open opening; a sealing plate, the sealing plate is connected to the cover and covers the open opening; an insulating plate, one of the insulating plate and the sealing plate is provided with a boss and the other is provided with a groove, the boss is inserted into the groove; two pole assemblies, each of the pole assemblies includes a pole and a connecting plate, the pole is provided on the cover, the connecting plate is connected to the pole, the connecting plate is located on the side of the insulating plate facing away from the sealing plate, and a pole ear space is defined between the connecting plate and the insulating plate.

[0005] Beneficial effects: By setting a sealing plate, the open mouth can be sealed to prevent the connecting piece, the pole ear and the pole group from being exposed to the air, reduce the probability of the connecting piece, the pole ear and the pole group contacting the outside world, ensure the normal operation of the battery, and reduce the probability of battery damage. By setting an insulating plate, the pole ear and the connecting piece can be isolated from the sealing plate, thereby preventing the sealing plate from being charged and causing battery leakage, and preventing the sealing plate from being connected to the two pole ears and causing a short circuit in the battery, ensuring that the battery can be used normally, and ensuring the insulation performance of the pole ear and the sealing plate, thereby improving the reliability of the battery. In addition, the insulating plate and the sealing plate are arranged in combination with grooves and bosses, which increases the contact surface between the sealing plate and the insulating plate, improves the restraining force of the sealing plate on the insulating plate, fully ensures the connection strength between the sealing plate and the insulating plate, and improves the sealing performance.

[0006] In an optional embodiment, the boss includes: a base; an undercut portion, the undercut portion is connected to the top of the base, the central axis of the base and the central axis of the undercut portion coincide with each other, the radius of the undercut portion is larger than the radius of the undercut portion, and the difference between the radius of the undercut portion and the radius of the top of the base is R, R ≥ 0.5 mm.

[0007] Beneficial effects: The matching area between the undercut portion and the groove is large, which is beneficial to improving the assembly strength between the sealing plate and the insulating plate and reducing the probability of separation of the sealing plate and the insulating plate.

[0008] In an optional embodiment, the diameter W of the bottom end of the base is 0.35 mm to 1.2 mm.

[0009] Beneficial effects: The base has a larger area, which can improve the structural strength of the root of the base, ensure the strength of the boss during the assembly and disassembly of the sealing plate and the insulating plate, and reduce the probability of the boss breaking.

[0010] In an optional embodiment, an annular rib is provided on the inner wall of the groove, and the annular rib is inserted into the undercut portion and located on a side of the undercut portion facing the base, and a height t1 of the annular rib is 0.25 mm to 0.55 mm.

[0011] Beneficial effects: The structural strength of the annular rib is sufficient and not easy to deform, which can ensure the reliability of the connection between the sealing plate and the insulating plate. The thickness of the insulating plate and the sealing plate can be reduced, saving space and improving space utilization. It can also avoid the height of the base being too large and reduce the probability of the base bending.

[0012] In an optional implementation, the height t2 of the undercut portion is 0.25 mm to 0.55 mm.

[0013] Beneficial effects: The undercut part has sufficient structural strength and is not prone to deformation, which can ensure the reliability of the connection between the sealing plate and the insulating plate. The thickness of the insulating plate and the sealing plate can be reduced, saving space and improving space utilization. It can also avoid the height of the base being too large and reduce the probability of the base bending.

[0014] In an optional embodiment, the diameter of the base gradually increases toward the undercut portion.

[0015] Beneficial effects: The connection area between the base and the undercut portion is large, which is beneficial to improving the structural strength of the boss and reducing the probability of damage to the boss. The contact area between the base and the annular rib is large, which is beneficial to improving the connection strength between the sealing plate and the insulating plate and ensuring the relative position stability between the sealing plate and the insulating plate.

[0016] In an optional embodiment, the sealing plate includes a plate body and a liquid injection platform, the liquid injection platform is arranged on the side of the sealing plate facing the insulating plate, the sealing plate is provided with a liquid injection hole, and the liquid injection hole passes through the plate body and the liquid injection platform; the insulating plate is provided with a through hole, and the liquid injection platform is inserted into the through hole.

[0017] Beneficial effects: The liquid injection hole is integrated on the sealing plate, and the insulating plate is provided with a through hole. The liquid injection hole and the through hole are communicated, so that the liquid injection of the battery can be realized. Moreover, the sealing plate includes a liquid injection table, and the liquid injection table is inserted into the through hole, which can fix the relative position between the insulating plate and the sealing plate.

[0018] In an alternative embodiment, there are a plurality of the bosses, and the plurality of bosses are arranged at intervals and arranged in multiple rows and columns; there are a plurality of the grooves, and the plurality of bosses and the plurality of grooves are connected in a one-to-one correspondence.

[0019] Beneficial effects: The connection between the sealing plate and the insulating plate is a multi-point connection, which can improve the connection strength between the sealing plate and the insulating plate and ensure the reliability of the relative position between the sealing plate and the insulating plate.

[0020] In a second aspect, the present invention also provides a battery, including: a housing, the housing is provided with a disassembly and assembly opening; the battery cover plate of the first embodiment, the cover plate is connected to the housing and seals the disassembly and assembly opening, and the cover plate and the housing enclose a receiving space; a pole group, the pole group is arranged in the receiving space and includes pole tabs, and the pole tabs are located in the pole tab space and are connected to the connecting piece.

[0021] Beneficial effects: The battery has the advantages of convenient installation and good insulation.

[0022] In a third aspect, the present invention also provides a battery pack, including the battery of the first embodiment.

[0023] Beneficial effects: The battery pack has the advantages of convenient installation and good insulation. Description of the drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is one of the structural schematic diagrams of the battery according to the embodiment of the present invention;

[0026] Figure 2 It is a cross-sectional view of the battery according to the embodiment of the present invention;

[0027] Figure 3 It is a matching schematic diagram of the sealing plate and the insulating plate of the battery according to the embodiment of the present invention;

[0028] Figure 4A cross-sectional view of a sealing plate and an insulating plate of a battery according to an embodiment of the utility model;

[0029] Figure 5 This is one of the structural schematic diagrams of the sealing plate of the battery according to the embodiment of the utility model;

[0030] Figure 6 This is a second structural schematic diagram of a sealing plate of a battery according to an embodiment of the utility model;

[0031] Figure 7 This is a cross-sectional view of a sealing plate of a battery according to an embodiment of the utility model;

[0032] Figure 8 The second cross-sectional view of the sealing plate of the battery according to the embodiment of the utility model;

[0033] Figure 9 This is a schematic structural diagram of an insulating plate of a battery according to an embodiment of the utility model;

[0034] Figure 10 A cross-sectional view of an insulating plate of a battery according to an embodiment of the utility model;

[0035] Figure 11 A schematic diagram of the matching of the battery housing and the cover plate of an embodiment of the utility model;

[0036] Figure 12 This is one of the structural schematic diagrams of the electrode group of the battery of the embodiment of the utility model;

[0037] Figure 13 This is the second structural schematic diagram of the electrode group of the battery according to the embodiment of the utility model.

[0038] Description of reference numerals:

[0039] 1. Battery; 100. Shell; 200. Pole group; 300. Pole column assembly; 310. Pole column; 320. Connecting piece; 330. Pole ear; 400. Sealing plate; 410. Groove; 411. Annular rib; 420. Liquid injection hole; 430. Explosion-proof part; 440. Liquid injection platform; 450. Plate body; 500. Insulating plate; 510. Boss; 511. Base; 512. Undercut part; 520; Through hole; 600. Cover plate; 610. Open mouth. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0041] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, 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 should not be construed as a limitation to the present utility model.

[0042] In the description of the present utility model, "a plurality of" means two or more. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" 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 directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. 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.

[0044] The following Figures 1 to 13 , describes the embodiments of the present utility model.

[0045] According to an embodiment of the present utility model, on the one hand, a battery cover plate is provided. The battery cover plate includes a cover plate 600, at least two pole column assemblies 300, a sealing plate 400, and an insulating plate 500.

[0046] The cover plate 600 is provided with an open mouth 610. The sealing plate 400 is connected to the cover plate 600 and seals the open mouth 610. One of the insulating plate 500 and the sealing plate 400 is provided with a boss 510 and the other is provided with a groove 410. The boss 510 is inserted into the groove 410. Each pole column assembly 300 includes a pole column 310 and a connecting piece 320. The pole column 310 is arranged on the cover plate 600. The connecting piece 320 is connected to the pole column 310. The connecting piece 320 is located on the side of the insulating plate 500 facing away from the sealing plate 400. An ear space is defined between the connecting piece 320 and the insulating plate 500.

[0047] For example, the groove 410 can be in shapes such as circular, square, oval, polygonal, racetrack-shaped, etc. The shape of the boss 510 can be adapted to the shape of the groove 410. The sealing plate 400 and the insulating plate 500 can be injection-molded and connected.

[0048] During the processing of the battery 1, the pole column 310 is installed on the cover plate 600, and the pole column 310 and the connecting piece 320 are welded and connected. Then, the connecting piece 320 and the tab 330 can be welded together through the open mouth 610. For example, the connecting piece 320 and the tab 330 can be welded through welding processes such as laser welding or ultrasonic welding, reducing the welding process between the connecting piece 320 and the tab 330 and improving the production efficiency.

[0049] By providing the sealing plate 400, the open mouth 610 can be sealed, preventing the connecting piece 320, the tab 330, and the electrode group 200 from being exposed to the air, reducing the probability of contact between the connecting piece 320, the tab 330, and the electrode group 200 and the outside, ensuring the normal operation of the battery 1, and reducing the probability of damage to the battery 1. Among them, the sealing plate 400 can be made of a metal material. The sealing plate 400 and the cover plate 600 can be welded. The connection strength between the sealing plate 400 and the cover plate 600 is high and the sealing performance is good. The insulating plate 500 can be made of a heat-melt material such as insulating plastic.

[0050] By providing the insulating plate 500, both the tab 330 and the connecting piece 320 can be isolated from the sealing plate 400, thus preventing the sealing plate 400 from being charged and causing the battery 1 to leak electricity, and preventing the sealing plate 400 from being connected to the two tabs 330 and causing the battery 1 to short-circuit, ensuring that the battery 1 can be used normally, ensuring the insulation performance between the tab 330 and the sealing plate 400, and improving the reliability of the battery 1.

[0051] In addition, the insulating plate 500 and the sealing plate 400 are arranged in coordination with the groove 410 and the boss 510, which increases the contact surface between the sealing plate 400 and the insulating plate 500, improves the restraint force of the sealing plate 400 on the insulating plate 500, fully ensures the connection strength between the sealing plate 400 and the insulating plate 500, and improves the sealing performance. Since the pole ear 330 is located in the pole ear space, that is, the pole ear 330 is located between the insulating plate 500 and the connecting plate 320, the pole ear 330 only needs to be bent once, which can reduce the bending process of the pole ear 330, reduce the processing difficulty, improve production efficiency, and improve the internal space utilization of the battery 1.

[0052] like Figure 9 and Figure 10 As shown, in the technical solution of this embodiment, the boss 510 includes a base 511 and an undercut portion 512, the undercut portion 512 is connected to the top of the base 511, the central axis of the base 511 coincides with the central axis of the undercut portion 512, the radius of the undercut portion 512 is greater than the radius of the base 511, and the difference between the radius of the undercut portion 512 and the radius of the top of the base 511 is R, R ≥ 0.5mm. In other words, the radius of the undercut portion 512 is greater than the radius of the top of the base 511, and the difference between the two radii is not less than 0.5mm. Among them, R can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0053] In this way, the matching area between the undercut portion 512 and the groove 410 is large, which is beneficial to improving the assembly strength between the sealing plate 400 and the insulating plate 500 and reducing the probability of separation of the sealing plate 400 and the insulating plate 500.

[0054] like Figure 10 As shown, in the technical solution of this embodiment, the diameter W of the bottom end of the base 511 is 0.35mm-1.2mm, wherein the diameter W of the bottom end of the base 511 can be 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, or 1.2mm. In this way, the base 511 has a larger area, which can improve the structural strength of the bottom of the base 511, ensure the strength of the boss 510 during the assembly and disassembly process of the sealing plate 400 and the insulating plate 500, and reduce the probability of the boss 510 breaking.

[0055] like Figure 4 and Figure 7As shown, in the technical solution of this embodiment, the inner wall of the groove 410 is provided with an annular rib 411, and the annular rib 411 is inserted on the side of the undercut portion 512 facing the base 511. The height t1 of the annular rib 411 is 0.25mm~0.55mm, and the height t1 of the annular rib 411 can be 0.25mm, 0.3mm, 0.45mm, 0.5mm or 0.55mm.

[0056] If the height t1 of the annular rib 411 is less than 0.25 mm, the strength of the annular rib 411 is too low and it is easy to deform, causing the sealing plate 400 and the insulating plate 500 to be easily separated and the connection reliability to be poor; if the height t1 of the annular rib 411 is greater than 0.55 mm, it is easy to cause the height of the base 511 to be too large, and the base 511 is easy to bend, affecting the structural stability of the boss 510, and may cause the thickness of the insulating plate 500 and the sealing plate 400 to increase, excessively occupying the space in the shell 100.

[0057] By setting t1 to 0.25mm~0.55mm, the structural strength of the annular rib 411 is sufficient and not prone to deformation, which can ensure the connection reliability of the sealing plate 400 and the insulating plate 500, and the thickness of the insulating plate 500 and the sealing plate 400 can be reduced, saving space and improving space utilization. It can also avoid the height of the base 511 being too large and reduce the probability of the base 511 bending.

[0058] like Figure 10 As shown, in the technical solution of this embodiment, the height t2 of the undercut portion 512 is 0.25 mm to 0.55 mm, and the height t2 of the undercut portion 512 can be 0.25 mm, 0.3 mm, 0.45 mm, 0.5 mm or 0.55 mm.

[0059] If the height t2 of the undercut portion 512 is less than 0.25 mm, the strength of the undercut portion 512 is too low and it is easy to deform, causing the sealing plate 400 and the insulating plate 500 to be easily separated and the connection reliability to be poor; if the height t2 of the undercut portion 512 is greater than 0.55 mm, it may cause the thickness of the insulating plate 500 and the sealing plate 400 to increase, thereby excessively occupying the space inside the shell 100.

[0060] By setting t2 to 0.25mm~0.55mm, the structural strength of the undercut portion 512 is sufficient and not prone to deformation, which can ensure the connection reliability between the sealing plate 400 and the insulating plate 500, and the thickness of the insulating plate 500 and the sealing plate 400 can be reduced, saving space and improving space utilization. It can also avoid the height of the base 511 being too large and reduce the probability of the base 511 bending.

[0061] like Figure 4 and Figure 10As shown, in the technical solution of this embodiment, the diameter of the base 511 gradually increases from low to high, that is, the diameter of the base 511 gradually increases toward the undercut portion 512. The shape of the annular rib 411 is adapted to the shape of the base 511.

[0062] In this way, the connection area between the base 511 and the undercut portion 512 is large, which is beneficial to improving the structural strength of the boss 510 and reducing the probability of damage to the boss 510. In addition, the contact area between the base 511 and the annular rib 411 is large, which is beneficial to improving the connection strength between the sealing plate 400 and the insulating plate 500 and ensuring the relative position stability between the sealing plate 400 and the insulating plate 500.

[0063] like Figure 7 As shown, in the technical solution of this embodiment, the thickness T of the sealing plate 400 is 1.2mm to 1.8mm. If T is less than 1.2mm, the thickness of the sealing plate 400 is too thin, the structural strength is low, and the sealing plate 400 is easily damaged; if T is greater than 1.8mm, the thickness of the sealing plate 400 is too thick, and too much internal space of the shell 100 is occupied, affecting the arrangement of the pole group 200 and the pole assembly 300. By setting T to 1.2mm to 1.8mm, the structural strength of the sealing plate 400 is higher and not easy to be damaged, and the thickness of the sealing plate 400 is thinner, occupying less space in the shell 100, saving internal space, and improving space utilization.

[0064] like Figure 3 , Figure 5 and Figure 6 As shown, in the technical solution of this embodiment, the sealing plate 400 includes a plate body 450 and a liquid injection platform 440, the liquid injection platform 440 is arranged on the side of the sealing plate 400 facing the insulating plate 500, and the sealing plate 400 is provided with a liquid injection hole 420, and the liquid injection hole 420 passes through the plate body 450 and the liquid injection platform 440. The insulating plate 500 is provided with a through hole 520, and the liquid injection platform 440 is inserted into the through hole 520.

[0065] In this way, the injection hole 620 is integrated on the sealing plate 400, and the through hole 520 is provided on the insulating plate 500. The injection hole 620 and the through hole 520 are connected to each other, so that the battery 1 can be injected. The sealing plate 400 includes an injection platform 440, which is inserted into the through hole 520 to fix the relative position between the insulating plate 500 and the sealing plate 400.

[0066] For example, the plate body 450 may be provided with an explosion-proof portion 430 , and the explosion-proof portion 430 and the injection hole 620 are spaced apart.

[0067] like Figures 6 to 10As shown, in the technical solution of this embodiment, there are multiple bosses 510, and the multiple bosses 510 are arranged at intervals and arranged in multiple rows and columns. There are multiple grooves 410, and the multiple grooves 410 are arranged at intervals and arranged in multiple rows and columns. The multiple bosses 510 and the multiple grooves 410 are connected in a one-to-one correspondence.

[0068] By setting the cooperation of multiple bosses 510 and multiple grooves 410, there are multiple connection points between the sealing plate 400 and the insulating plate 500, which can improve the connection strength between the sealing plate 400 and the insulating plate 500 and ensure the relative position reliability between the sealing plate 400 and the insulating plate 500. In addition, the multiple bosses 510 are arranged at intervals and arranged in multiple rows and columns, and the multiple grooves 410 are arranged at intervals and arranged in multiple rows and columns, which can increase the number of bosses 510 and grooves 410, so that the connection strength between the insulating plate 500 and the sealing plate 400 is greater.

[0069] According to an embodiment of the present invention, on the other hand, a battery 1 is also provided. The battery 1 includes a housing 100, a pole group 200, and the battery cover plate of the above embodiment.

[0070] The housing 100 is provided with a disassembly and assembly opening. The cover plate 600 is connected to the housing 100 and seals the disassembly and assembly opening. The cover plate 600 and the housing 100 enclose a receiving space. The pole group 200 is arranged in the receiving space and includes pole tabs 330. The pole tabs 330 are located in the pole tab space and are connected to the connecting piece 320. Among them, there are two pole tabs 330, one is a positive pole tab and the other is a negative pole tab. One of the two pole column assemblies 300 is a positive pole column assembly and the other is a negative pole column assembly. The positive pole tab is connected to the connecting piece 320 of the positive pole column assembly, and the negative pole tab is connected to the connecting piece 320 of the negative pole column assembly.

[0071] During the processing of the battery 1, when the cover plate 600 and the housing 100 are not connected, the pole group 200 can be installed into the housing 100 through the disassembly and assembly opening, then the pole column 310 is installed on the cover plate 600, and the pole column 310 and the connecting piece 320 are welded and connected. Then, the connecting piece 320 and the pole tab 330 can be welded together through the open opening 610. For example, the connecting piece 320 and the pole tab 330 can be welded by welding processes such as laser welding or ultrasonic welding, reducing the welding process of the connecting piece 320 and the pole tab 330 and improving the production efficiency.

[0072] Since the pole tab 330 is located in the pole tab space, that is, the pole tab 330 is located between the insulating plate 500 and the connecting piece 320, the pole tab 330 only needs to be bent once, which can reduce the bending process of the pole tab 330, reduce the processing difficulty, improve the production efficiency, and improve the space utilization rate inside the battery 1.

[0073] According to an embodiment of the present utility model, on the other hand, a battery pack is further provided, including the battery 1 of the second aspect embodiment. The battery pack of the embodiment of the present utility model utilizes the battery 1 and has the advantages of good insulation, convenient processing, and high space utilization.

[0074] Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cover, characterized in that: include: A cover plate, wherein the cover plate is provided with an opening; A sealing plate connected to the cover plate and covering the open opening; An insulating plate, wherein one of the insulating plate and the sealing plate is provided with a boss and the other is provided with a groove, and the boss is inserted into the groove; Two pole assemblies, each of which includes a pole and a connecting piece, the pole is arranged on the cover plate, the connecting piece is connected to the pole, the connecting piece is located on the side of the insulating plate facing away from the sealing plate, and a pole ear space is defined between the connecting piece and the insulating plate.

2. The battery cover according to claim 1, characterized in that: The boss comprises: Base; An undercut portion, wherein the undercut portion is connected to the top of the base, the central axis of the base coincides with the central axis of the undercut portion, the radius of the undercut portion is greater than the radius of the undercut portion, and the difference between the radius of the undercut portion and the radius of the top of the base is R, R≥0.5mm.

3. The battery cover according to claim 2, characterized in that: The diameter W of the bottom end of the base is 0.35 mm to 1.2 mm.

4. The battery cover according to claim 2, characterized in that: An annular rib is provided on the inner wall of the groove, and the annular rib is located on the side of the undercut portion facing the base, and the height t1 of the annular rib is 0.25 mm to 0.55 mm.

5. The battery cover according to claim 2, characterized in that: The height t2 of the undercut portion is 0.25 mm to 0.55 mm.

6. The battery cover according to claim 2, characterized in that: The diameter of the base gradually increases toward the direction approaching the undercut portion.

7. The battery cover according to any one of claims 1 to 6, characterized in that: The sealing plate comprises a plate body and a liquid injection platform, wherein the liquid injection platform is arranged on a side of the sealing plate facing the insulating plate, and the sealing plate is provided with a liquid injection hole, and the liquid injection hole passes through the plate body and the liquid injection platform; The insulating plate is provided with a through hole, and the liquid injection platform is inserted into the through hole.

8. The battery cover according to any one of claims 1 to 6, characterized in that: There are multiple bosses, and the multiple bosses are spaced apart and arranged in multiple rows and columns; There are a plurality of grooves, and the plurality of bosses and the plurality of grooves are connected in a one-to-one correspondence.

9. A battery, characterized in that: include: A housing, wherein the housing is provided with a disassembly opening; The battery cover according to any one of claims 1 to 8, wherein the cover is connected to the shell and covers the disassembly opening, and the cover and the shell together form a receiving space; A pole group is arranged in the accommodating space and includes a pole ear, and the pole ear is located in the pole ear space and connected to the connecting sheet.

10. A battery pack, characterized in that: Comprising a battery according to claim 9.

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