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 comprises a battery cover plate, the battery cover plate comprises a cover plate body and a sealing piece, a mounting hole is formed in the cover plate body, a liquid injection hole penetrating through the cover plate body is formed in the hole bottom of the mounting hole, the sealing piece is arranged in the mounting hole, and the peripheral side wall of the sealing piece and the hole wall of the mounting hole are welded and sealed; a containing groove used for containing welding slag is concavely formed in the center of the side, away from the liquid injection hole, of the sealing piece. According to the battery cover plate provided by the utility model, the accommodating groove is formed in the surface of the sealing sheet, so that welding slag generated during welding is splashed and falls into the accommodating groove, the welding slag is prevented from protruding out of the upper surface of the sealing sheet, the flatness and the attractiveness of the appearance of the battery cover plate are ensured, secondly, the welding slag cannot jack up an insulating film during subsequent film coating, and the service life of the battery cover plate is prolonged. And the risks of poor appearance and piercing of the insulating film are avoided, so that the insulating property of the battery is ensured.

Description

Technical Field

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

[0002] During battery production, after the battery is filled, the injection channel on the battery cover needs to be sealed to ensure the safety of the battery cell during use. The battery cover has a mounting hole, and at the bottom of the mounting hole is an injection hole that runs through the battery cover. The sealing process involves using elastic sealing pins to seal the injection hole, blocking the internal electrolyte leakage channel. Then, a sealing sheet is placed in the mounting hole and the edge of the sealing sheet and the edge of the mounting hole are laser welded to complete the seal.

[0003] However, when the sealing sheet is welded using a laser, the presence of impurities on the weld surface can easily cause micro-explosions in the molten pool, or insufficient laser stability can cause instability inside the molten pool. The molten metal liquid splashes out of the molten pool and easily lands on the surface of the sealing sheet. After solidification, it will form convex welding slag. The welding slag not only affects the appearance of the cover plate, but also lifts up the insulating film during the subsequent battery packaging process, posing a risk of puncturing the insulating film and affecting the insulation performance of the battery.

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

[0005] One purpose of the present utility model is to provide a battery cover plate, which can solve the technical problems that welding slag falls on the surface of the sealing sheet and affects the aesthetics and pierces the insulating film.

[0006] Another object of the present invention is to provide a battery cover plate that can solve the technical problems of welding slag falling on the surface of the sealing sheet, affecting the aesthetics and piercing the insulating film.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] Battery cover, including:

[0009] A cover plate body, wherein a mounting hole is formed on the cover plate body, and a liquid injection hole is formed at the bottom of the mounting hole and passes through the cover plate body;

[0010] A sealing sheet is arranged in the mounting hole, the outer peripheral side wall of the sealing sheet is welded and sealed with the hole wall of the mounting hole, and a receiving groove for receiving welding slag is recessed at the center of the side of the sealing sheet away from the injection hole.

[0011] As an optional solution, the depth of the accommodating groove is 0.2 to 0.4 times the thickness of the sealing sheet.

[0012] As an optional solution, the width b between the top edge of the accommodating groove and the top outer edge of the sealing sheet is 0.1-0.5 mm.

[0013] As an optional solution, the bottom edge of the accommodating groove is a sharp corner or a rounded corner.

[0014] As an optional solution, the thickness of the sealing sheet is 0.8 to 0.98 times the depth of the mounting hole.

[0015] As an optional solution, there is a gap between the top outer edge of the sealing sheet and the hole wall of the mounting hole, and a molten pool is formed by welding between the sealing sheet and the cover plate body along the circumference of the gap, and one side of the molten pool intersects with the side wall of the accommodating groove.

[0016] As an optional solution, the width of the gap is 0.06-0.14 mm.

[0017] As an optional solution, the battery cover further includes a sealing pin, which is interference-fitted in the injection hole, and a side of the sealing sheet close to the injection hole is provided with an escape groove for evading the sealing pin.

[0018] As an optional solution, the depth of the avoidance groove is 0.35 to 0.65 times the thickness of the sealing sheet; and / or the aperture of the avoidance groove is 0.5 to 0.9 times the diameter of the top end of the sealing sheet.

[0019] A battery comprises a shell, a battery cell and the above-mentioned battery cover plate, wherein the battery cell is accommodated in the shell and the battery cover plate is covered on the shell.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a battery cover, in which the outer peripheral side wall of the sealing sheet and the hole wall of the mounting hole are sealed by welding. By arranging a receiving groove on the surface of the sealing sheet, welding slag generated during welding will splash and fall into the inside of the receiving groove, preventing the welding slag from protruding from the upper surface of the sealing sheet, thereby ensuring the smoothness and aesthetics of the appearance of the battery cover; secondly, during the subsequent film coating, the welding slag will not lift up the insulating film, avoiding the risk of causing poor appearance and puncturing the insulating film, thereby ensuring the insulation performance of the battery.

[0022] The present invention also provides a battery. By providing the above-mentioned battery cover, welding slag can be prevented from protruding from the upper surface of the sealing sheet, thereby ensuring the flatness and aesthetics of the appearance of the battery cover. Secondly, during the subsequent film coating, the welding slag will not lift up the insulating film, avoiding the risk of causing poor appearance and puncturing the insulating film, thereby ensuring the insulation performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a top view of the battery cover provided by the present utility model;

[0024] Figure 2 This is a cross-sectional view of the battery cover provided by the present utility model;

[0025] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle;

[0026] Figure 4 It is a cross-sectional view of a battery cover provided by the prior art;

[0027] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0028] Figure 6 This is a cross-sectional view of a sealing sheet provided by one embodiment of the present utility model;

[0029] Figure 7 It is a cross-sectional view of a sealing sheet provided in another embodiment of the present invention.

[0030] In the picture:

[0031] 10. Cover plate body; 11. Mounting hole; 12. Liquid injection hole; 13. Step surface;

[0032] 20. Sealing piece; 21. Accommodating groove; 211. Groove sidewall; 212. Sharp corner; 213. Rounded corner; 22. Avoidance groove; 23. Positioning hole;

[0033] 30. Molten pool;

[0034] 40. Sealing nails. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] This embodiment provides a battery cover suitable for use in square batteries. Figure 1 and Figure 2 As shown, the battery cover includes a cover body 10 and a sealing sheet 20. The cover body 10 is provided with a mounting hole 11. The bottom of the mounting hole 11 is provided with an injection hole 12 that penetrates the cover body 10. The mounting hole 11 is arranged around the injection hole 12, and electrolyte can be injected into the battery through the injection hole 12. The sealing sheet 20 is arranged in the mounting hole 11. The outer peripheral side wall of the sealing sheet 20 is welded and sealed with the hole wall of the mounting hole 11 to form a molten pool 30. After the molten pool 30 solidifies, a weld is formed. The sealing sheet 20 is made of the same metal material as the cover body 10, so that the two can be fixedly connected as one by laser welding. A receiving groove 21 for receiving welding slag is recessed in the center of the side of the sealing sheet 20 away from the injection hole 12. The receiving groove 21 is coaxial with the sealing sheet 20.

[0040] In the battery cover provided by this embodiment, the outer peripheral side wall of the sealing sheet 20 and the hole wall of the mounting hole 11 are sealed by welding. By providing a receiving groove 21 on the surface of the sealing sheet 20, the welding slag generated during welding will splash and fall into the inside of the receiving groove 21, preventing the welding slag from protruding from the upper surface of the sealing sheet 20, thereby ensuring the flatness and aesthetics of the appearance of the battery cover; secondly, during the subsequent coating, the welding slag will not lift up the insulating film, avoiding the risk of causing poor appearance and piercing the insulating film, thereby ensuring the insulation performance of the battery; in addition, the receiving groove 21 can also serve as a stress release groove, which reduces the overall thickness of the sealing sheet 20, improves the ductility of the sealing sheet 20, can effectively release the stress near the weld, prevents cracks in the weld, and improves the sealing performance of the battery cover.

[0041] The cross-sectional shape of the receiving groove 21 can be trapezoidal, rectangular, arc-shaped or other shapes, which are not specifically limited here. In this embodiment, the cross-sectional shape of the receiving groove 21 is trapezoidal as an example for description.

[0042] Specifically, if Figure 3 As shown, there is an annular gap between the top outer edge of the sealing sheet 20 and the hole wall of the mounting hole 11, and a molten pool 30 is formed by laser welding between the sealing sheet 20 and the cover plate body 10 along the circumference of the gap, and one side of the molten pool 30 intersects with the groove side wall 211 of the accommodating groove 21. Figure 4 and Figure 5 The sealing sheet 20 without the receiving groove 21 in the prior art is shown, and compared with the prior art, as shown in FIG. Figure 3 As shown, around the sealing sheet 20 with the receiving groove 21, the molten metal liquid will instantly solidify along the groove sidewall 211 of the receiving groove 21 to form a molten pool 30. The internal stress of the molten pool 30 during the solidification process can be released through the receiving groove 21, reducing the risk of cracks in the center of the weld. Figure 4 and Figure 5 As shown, after the sealing sheet 20 without the receiving groove 21 is welded, the molten pool 30 and the top of the sealing sheet 20 are fused together. The internal stress of solidification during the solidification process cannot be released through the deformation of the sealing sheet 20. Therefore, the reaction force of the sealing sheet 20 and the cover plate body 10 will stretch the weld, and there is a risk of cracking in the center of the weld.

[0043] In an optional embodiment, the gap width between the top outer edge of the sealing sheet 20 and the wall of the mounting hole 11 is 0.06 to 0.14 mm. For example, the gap can be 0.06 mm, 0.08 mm, 0.10 mm, 0.12 mm, or 0.14 mm. By properly setting the gap width, the width and position of the weld can be guaranteed, the weld quality can be improved, and the sealing reliability of the sealing sheet 20 can be guaranteed.

[0044] Furthermore, if Figure 2As shown, the battery cover also includes a sealing pin 40, which is interference-fitted within the injection hole 12. The circumferential surface of the sealing pin 40 tightly mates with the wall of the injection hole 12, forming a primary seal. The sealing sheet 20 is fixed to the mounting hole 11 by laser welding, thereby forming a secondary seal and ensuring the sealing reliability of the battery cover. In an optional embodiment, the injection hole 12 is a circular hole, and the sealing pin 40 is a stepped cylinder. The size of the sealing pin 40 is slightly larger than that of the injection hole 12. The sealing pin 40 is a rubber pin, and forms an interference fit with the injection hole 12 through its own elastic deformation.

[0045] In an optional embodiment, if Figure 2 As shown, the mounting hole 11 and the injection hole 12 are coaxially arranged. The radial dimension of the mounting hole 11 is larger than the radial dimension of the injection hole 12. Therefore, the mounting hole 11 and the injection hole 12 together form a stepped hole, and a step surface 13 is formed at the connection between the mounting hole 11 and the injection hole 12. The bottom end of the sealing piece 20 can abut against the step surface 13. The above arrangement can limit the installation of the sealing piece 20, preventing the sealing piece 20 from squeezing the sealing pin 40, thereby ensuring the sealing performance. Secondly, the step surface 13 can also support the sealing piece 20 during welding, so that the sealing piece 20 is placed stably and the welding quality is guaranteed.

[0046] In an optional embodiment, the circumferential side wall of the mounting hole 11 is an inclined surface, and the diameter of the mounting hole 11 gradually increases along the axial direction of the mounting hole 11 and in the direction gradually away from the injection hole 12, that is, the mounting hole 11 is an inverted truncated cone arranged on the side away from the injection hole 12; correspondingly, Figure 6 As shown, the sealing sheet 20 also has an inverted truncated cone shape, with the larger end facing away from the injection hole 12. That is, the diameter of the sealing sheet 20 gradually increases along the axial direction of the mounting hole 11 and in a direction gradually away from the injection hole 12, thus adapting to the mounting hole 11. Therefore, the sealing sheet 20 and the mounting hole 11 form an inclined surface, which enhances the sealing effect. In another optional embodiment, the mounting hole 11 and the sealing sheet 20 can also be cylindrical, which is not specifically limited here.

[0047] In an optional embodiment, the thickness of the sealing sheet 20 is 0.8 to 0.98 times the depth of the mounting hole 11. For example, the thickness of the sealing sheet 20 can be 0.8, 0.83, 0.86, 0.89, 0.92, 0.95, or 0.98 times the depth of the mounting hole 11. By properly setting the relationship between the thickness of the sealing sheet 20 and the depth of the mounting hole 11, when the sealing sheet 20 is placed in the mounting hole 11, the upper surface of the sealing sheet 20 is not completely flush with the upper surface of the cover body 10, but is slightly lower than the upper surface of the cover body 10. On the one hand, this prevents the sealing sheet 20 from being higher than the surface of the cover body 10 due to poor tolerance control and being unable to be fully placed in the mounting hole 11; on the other hand, since the upper surface of the sealing sheet 20 is lower than the upper surface of the cover body 10, it also has the function of accommodating welding slag, preventing the welding slag from protruding from the upper surface of the cover body 10, ensuring the aesthetics of the battery cover, and preventing the welding slag from piercing the insulating film.

[0048] In an optional embodiment, if Figure 6 As shown, a positioning hole 23 is recessed at the center of the bottom of the receiving groove 21 , and the positioning hole 23 is coaxially arranged with the receiving groove 21 to facilitate visual identification of subsequent welding equipment.

[0049] Furthermore, if Figure 2 and Figure 6 As shown, a relief groove 22 is recessed on one side of the sealing sheet 20 near the injection hole 12 for circumventing the sealing pin 40. The radial dimension of the relief groove 22 is larger than the radial dimension of the top of the sealing pin 40, thereby circumventing the sealing pin 40 and preventing interference between the sealing sheet 20 and the sealing pin 40. This not only ensures the normal installation of the sealing pin 40, but also ensures the normal installation of the sealing sheet 20. In addition, the relief groove 22 can further reduce the thickness of the sealing sheet 20 while ensuring the structural strength of the sealing sheet 20, thereby further improving the stress release effect of the sealing sheet 20 and preventing cracks in the weld.

[0050] In an optional embodiment, if Figure 6 As shown, the depth h1 of the receiving groove 21 is 0.2 to 0.4 times the thickness H of the sealing sheet 20. For example, the depth h1 of the receiving groove 21 can be 0.2 times, 0.3 times, or 0.4 times the thickness H of the sealing sheet 20. By setting the relationship between the depth h1 of the receiving groove 21 and the thickness H of the sealing sheet 20 within the above-mentioned reasonable range, it is possible to ensure that the depth of the receiving groove 21 is greater than the height of the welding slag splashed into the receiving groove 21, prevent the welding slag from protruding from the upper surface of the sealing sheet 20, ensure the aesthetics of the battery cover and prevent the welding slag from piercing the insulating film, while also ensuring the structural strength of the sealing sheet 20.

[0051] In an optional embodiment, if Figure 6As shown, the width b between the top edge of the receiving groove 21 and the top outer edge of the sealing sheet 20 is 0.1 to 0.5 mm. Exemplarily, the width b between the top edge of the receiving groove 21 and the top outer edge of the sealing sheet 20 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm. It is understandable that if the width b is set too large, it cannot be guaranteed that the receiving groove 21 is within the range of the side of the molten pool 30, resulting in the internal stress of the molten pool 30 during the solidification process cannot be effectively released through the receiving groove 21. At the same time, a certain thickness of welding part needs to be reserved on the outer peripheral side of the sealing sheet 20 for welding. Therefore, the width b cannot be set too small. Therefore, by setting the width b within the above-mentioned reasonable range, it is possible to ensure that the receiving groove 21 is within the range of the side of the molten pool 30, so that the internal stress of the molten pool 30 during the solidification process can be effectively released through the receiving groove 21. At the same time, the outer peripheral side of the sealing sheet 20 can reserve a welding part of sufficient thickness for welding, so that the sealing sheet 20 and the cover plate body 10 can be welded and sealed to ensure the welding quality.

[0052] In an optional embodiment, if Figure 7 As shown, the bottom edge of the receiving groove 21 is a rounded corner 213. That is, the bottom edge of the receiving groove 21 adopts an arc transition, which can avoid the risk of cracking of the bottom edge of the groove due to the sharp angle transition.

[0053] In another optional embodiment, as Figure 6 As shown, if actual processing issues are considered, the bottom edge of the receiving groove 21 can also be a sharp corner 212. Compared with the arc transition, the receiving groove 21 with a sharp corner 212 transition is easier to process and saves processing costs. It can be selected according to actual needs.

[0054] In an optional embodiment, if Figure 6 As shown, the depth h2 of the avoidance groove 22 is 0.35 to 0.65 times the thickness H of the sealing sheet 20. For example, the depth h2 of the avoidance groove 22 can be 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, or 0.65 times the thickness H of the sealing sheet 20. By setting the relationship between the depth h2 of the avoidance groove 22 and the thickness H of the sealing sheet 20 within the above range, firstly, the avoidance groove 22 can ensure the avoidance effect of the sealing nail 40. Secondly, the avoidance groove 22 can meet a certain stress release capacity and also ensure the structural strength of the sealing sheet 20.

[0055] It should be noted that, combined with Figure 6When selecting the depth h1 of the receiving groove 21 and the depth h2 of the avoidance groove 22, it is first necessary to ensure that the depth h1 of the receiving groove 21 and the depth h2 of the avoidance groove 22 each satisfy the above-mentioned relationship with the thickness H of the sealing sheet 20. In addition, it is also necessary to ensure that there is sufficient wall thickness between the receiving groove 21 and the avoidance groove 22 to ensure the structural strength of the sealing sheet 20.

[0056] In an optional embodiment, if Figure 6 As shown, the diameter d of the avoidance groove 22 is 0.5 to 0.9 times the diameter D of the top end of the sealing plate 20. For example, the diameter d of the avoidance groove 22 can be 0.5, 0.6, 0.7, 0.8, or 0.9 times the diameter D of the top end of the sealing plate 20. By setting the relationship between the diameter d of the avoidance groove 22 and the diameter D of the top end of the sealing plate 20 within the above range, the avoidance groove 22 can achieve a certain stress relief capacity while meeting the requirements for avoiding the sealing pin 40, and can also ensure the structural strength of the sealing plate 20.

[0057] For example, in an optional embodiment, the thickness H of the sealing sheet 20 can be selected to be 0.7~1.6 mm, the top diameter D of the sealing sheet 20 can be selected to be 7.65~7.80 mm, the depth h2 of the avoidance groove 22 can be selected to be 0.35~0.55 mm, and the diameter d of the avoidance hole can be selected to be 4.00~7.00 mm, as long as the relationship between the depth h2 of the avoidance groove 22 and the thickness H of the sealing sheet 20 and the relationship between the diameter d of the avoidance groove 22 and the top diameter D of the sealing sheet 20 are satisfied.

[0058] Furthermore, the cover body 10 is made of a plain aluminum plate, and the sealing sheet 20 is made of metal, preferably aluminum, which has high structural strength and wear resistance. It should be noted that in addition to the cover body 10 and sealing sheet 20 described above, the battery cover also includes a terminal, an explosion-proof valve, a lower plastic plate, and other structures. The other structures of the battery cover belong to the existing technology and will not be repeated here.

[0059] This embodiment also provides a battery comprising a housing, a battery cell, and the aforementioned battery cover. The battery cell is housed within the housing, and the battery cover is sealed against the housing. The injection hole 12 on the cover body 10 is used to inject electrolyte into the battery so that the battery cell is soaked in the electrolyte.

[0060] The battery provided in this embodiment, by providing the aforementioned battery cover, can prevent welding slag from protruding from the upper surface of the sealing sheet 20, thereby ensuring the smoothness and aesthetic appearance of the battery cover. Secondly, during the subsequent coating, the welding slag will not lift up the insulating film, avoiding the risk of causing poor appearance and puncturing the insulating film, thereby ensuring the insulation performance of the battery. In addition, the receiving groove 21 can also serve as a stress relief groove, which reduces the overall thickness of the sealing sheet 20, improves the ductility of the sealing sheet 20, and can effectively relieve stress near the weld, preventing cracks in the weld, and improving the sealing performance of the battery cover.

[0061] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Battery cover, characterized in that: include: A cover plate body (10), wherein a mounting hole (11) is provided on the cover plate body (10), and a liquid injection hole (12) penetrating the cover plate body (10) is provided at the bottom of the mounting hole (11); A sealing sheet (20) is disposed in the mounting hole (11), the outer peripheral side wall of the sealing sheet (20) being welded and sealed to the hole wall of the mounting hole (11), and a receiving groove (21) for receiving welding slag is recessed at the center of a side of the sealing sheet (20) away from the injection hole (12).

2. The battery cover according to claim 1, characterized in that: The depth of the accommodating groove (21) is 0.2 to 0.4 times the thickness of the sealing sheet (20).

3. The battery cover according to claim 1, characterized in that: The width b between the top edge of the receiving groove (21) and the top outer edge of the sealing sheet (20) is 0.1 to 0.5 mm.

4. The battery cover according to claim 1, characterized in that: The bottom edge of the accommodating groove (21) is a sharp corner (212) or a rounded corner (213).

5. The battery cover according to claim 1, characterized in that: The thickness of the sealing sheet (20) is 0.8 to 0.98 times the depth of the mounting hole (11).

6. The battery cover according to any one of claims 1 to 5, characterized in that: A gap is provided between the top outer edge of the sealing sheet (20) and the hole wall of the mounting hole (11), and a molten pool (30) is formed by welding between the sealing sheet (20) and the cover plate body (10) along the circumference of the gap, and one side of the molten pool (30) intersects with the groove side wall (211) of the accommodating groove (21).

7. The battery cover according to claim 6, characterized in that: The width of the gap is 0.06-0.14 mm.

8. The battery cover according to any one of claims 1 to 5, characterized in that: The battery cover plate further comprises a sealing nail (40), wherein the sealing nail (40) is interference-fitted in the liquid injection hole (12), and a side of the sealing sheet (20) close to the liquid injection hole (12) is recessed with an avoidance groove (22) for avoiding the sealing nail (40).

9. The battery cover according to claim 8, characterized in that: The depth of the avoidance groove (22) is 0.35 to 0.65 times the thickness of the sealing sheet (20); and / or the diameter of the avoidance groove (22) is 0.5 to 0.9 times the diameter of the top end of the sealing sheet (20).

10. A battery, characterized in that The battery comprises a shell, a battery cell and a battery cover as claimed in any one of claims 1 to 9, wherein the battery cell is accommodated in the shell and the battery cover is covered on the shell.

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