Cover plate, top cover assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a cover plate, a top cover assembly and a battery. The cover plate is applied to the top cover assembly, the top cover assembly further comprises an additional assembly, a welding process hole and a sinking groove are formed in the cover plate, the additional assembly can be welded and positioned on the cover plate through the welding process hole, and the sinking groove surrounds the welding process hole. According to the cover plate, the sinking groove blocks a flow path between the welding process hole and the cover plate area outside the sinking groove, when an additional assembly is welded to the welding process hole, only materials, located in the area inside the sinking groove and close to the center of the welding process hole, of the cover plate are affected, and the situation that the materials in the cover plate area outside the sinking groove are molten is avoided; therefore, the deformation area of the cover plate near the welding process hole is effectively reduced, the geometric stability and the use performance of the cover plate are improved, the production quality and the use stability and reliability of the top cover assembly are improved, and the service life of the battery is prolonged.

Description

Technical Field

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

[0002] In modern society, more and more power tools and new energy vehicles are developing power sources that require high capacity and high safety. Batteries, with their excellent properties such as high capacity, are widely used in these tools and new energy vehicles. In addition to high capacity, these batteries must also exhibit excellent safety to meet usage standards and meet people's needs.

[0003] Currently, battery top cover assemblies often feature welding holes on the cover plate, providing a physical connection interface for mounting additional components on the top cover assembly. However, during the subsequent welding of additional components onto the welding holes, the cover plate material near the weld point melts due to the high temperature, causing the cover plate material around the welding hole to flow toward the center of the welding hole. This can cause deformation of the cover plate near the welding hole, degrading its performance and affecting the quality and reliability of the entire top cover assembly.

[0004] Based on the above, there is an urgent need for a cover plate, a top cover assembly and a battery to solve the problems existing in the prior art. Utility Model Content

[0005] The first object of the present utility model is to provide a cover plate, which can solve the technical problem that the cover plate is deformed during the process of welding additional components on the welding process holes, resulting in a decrease in the performance of the cover plate.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] The cover plate is applied to the top cover assembly of the battery. The top cover assembly also includes an additional component. The cover plate is provided with a welding process hole and a sink groove. The additional component can be welded through the welding process hole and positioned on the cover plate. The sink groove is arranged around the welding process hole.

[0008] Preferably, the welding process hole includes a first hole, and the first hole is set through the cover plate, and the first hole is used to inject electrolyte into the battery shell;

[0009] The additional component includes a liquid injection sealing nail and an explosion-proof valve assembly, wherein the liquid injection sealing nail is arranged in the first hole and is sealed and welded to the inner wall of the first hole, and the explosion-proof valve assembly is installed on the cover plate;

[0010] The sink includes a first groove, which is arranged around the first hole and is located between the liquid injection sealing nail and the explosion-proof valve assembly.

[0011] Preferably, the first hole includes a first stepped hole and a second stepped hole, and the first stepped hole and the second stepped hole are arranged in sequence along a direction from the top surface of the cover plate to the bottom surface of the cover plate, and the aperture of the first stepped hole is larger than the aperture of the second stepped hole, and a first stepped surface is formed between the first stepped hole and the second stepped hole;

[0012] The liquid injection sealing nail includes a large diameter section and a small diameter section, and a second step surface is formed between the large diameter section and the small diameter section. The large diameter section is sealed and fitted with the inner wall of the first step hole and welded together, and the small diameter section is sealed and fitted with the inner wall of the second step hole, and the second step surface is fitted and connected to the first step surface.

[0013] Preferably, the welding process hole includes a second hole, and the second hole is arranged through the cover plate;

[0014] The explosion-proof valve assembly is disposed in the second hole and is sealed and welded to the inner wall of the second hole;

[0015] The sink includes a second groove, and the second groove is arranged around the second hole.

[0016] Preferably, the radial distance between the first groove and the first hole is m1, and m1 is greater than or equal to 2 mm;

[0017] And, a radial distance between the second groove and the second hole is m2, and m2 is greater than or equal to 2 mm.

[0018] Preferably, the depth of the first groove is h1, and h1 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm;

[0019] And, the depth of the second groove is h2, h2 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

[0020] Preferably, the horizontal cross-section of the trough is annular.

[0021] Preferably, the vertical cross-sectional area of ​​the trough gradually decreases along the direction from the opening of the trough to the bottom of the trough.

[0022] A second object of the present invention is to provide a top cover assembly that can increase the production quality and the stability and reliability of the top cover assembly.

[0023] To achieve this purpose, the present invention adopts the following technical solutions:

[0024] The top cover assembly includes the above-mentioned cover plate.

[0025] The third object of the present utility model is to provide a battery that can enhance the sealing and safety of the battery during use, increase the service life of the battery, and reduce the cost of use.

[0026] To achieve this purpose, the present invention adopts the following technical solutions:

[0027] A battery comprises a shell, a battery cell and the above-mentioned top cover assembly, wherein the battery cell is arranged in the shell, and the top cover assembly is arranged at the opening of the shell.

[0028] Beneficial effects of the utility model:

[0029] This embodiment provides a cover plate, which is provided with a sink groove surrounding the welding process hole. The sink groove blocks the flow path between the welding process hole and the cover plate area outside the sink groove. When the additional component is welded to the welding process hole, it will only affect the material of the cover plate in the internal area of ​​the sink groove and close to the center of the welding process hole. There is no possibility that the material of the cover plate area outside the sink groove will melt or even move toward the center of the welding process hole, thereby effectively reducing the deformation area of ​​the cover plate near the welding process hole and improving the geometric stability and performance of the cover plate.

[0030] This embodiment also provides a top cover assembly. By arranging the above-mentioned cover plate in the top cover assembly, the production quality and the stability and reliability of the top cover assembly are effectively improved.

[0031] This embodiment also provides a battery. Since the battery is made of the above-mentioned top cover assembly, the welding quality of the shell and the top cover assembly in the battery is good, which ensures the sealing and safety of the battery during use, improves the service life of the battery, and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of a top cover assembly provided by an embodiment of the present utility model;

[0033] Figure 2 This is a schematic diagram of the exploded structure of the top cover assembly provided by an embodiment of the present utility model;

[0034] Figure 3 is a top view of the top cover assembly provided by an embodiment of the present utility model;

[0035] Figure 4 It is along Figure 2 Cross-sectional view at AA in the middle;

[0036] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0037] Figure 6 yes Figure 4 A partial enlarged view of point C in the middle.

[0038] In the picture:

[0039] 1. Cover plate; 11. Welding process hole; 111. First hole; 1111. First stepped hole; 1112. Second stepped hole; 112. Second hole; 121. First groove; 12. Sink; 122. Second groove; 13. Pole hole;

[0040] 2. Pole; 21. Positive pole; 22. Negative pole;

[0041] 31. Explosion-proof valve assembly; 32. Positive electrode aluminum block; 33. Negative electrode aluminum block; 34. Positive electrode upper plastic part; 35. Negative electrode upper plastic part; 36. Lower plastic part; 37. Positive electrode sealing ring; 38. Negative electrode sealing ring. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Currently, if Figure 1 As shown, a battery generally includes a shell, a battery cell and a top cover assembly. The battery cell is arranged in the shell. The top cover assembly includes a cover plate 1, a pole 2 and an additional component installed on the cover plate 1. The cover plate 1 is arranged at the opening of the shell to seal the shell. The pole 2 is arranged through the cover plate 1. The tabs on the battery cell are electrically connected to the pole 2, thereby realizing electrical conduction between the inside and the outside of the battery.

[0046] The cover plate 1 is provided with a welding process hole 11, which provides a physical connection interface for mounting an additional component on the top cover assembly. The additional component is then welded and positioned on the cover plate 1 through the welding process hole 11. However, in the top cover assembly provided by the prior art, during the subsequent welding process of the additional component to the cover plate 1 through the welding process hole 11, the material of the cover plate 1 near the welding point is affected by the high temperature and melts, causing the material of the cover plate 1 around the welding process hole 11 to flow toward the center of the welding process hole 11. This causes deformation of the cover plate 1 near the welding process hole 11, which reduces the performance of the cover plate 1.

[0047] In order to solve the above technical problems, this embodiment provides a cover plate 1, such as Figures 1 to 6 As shown, the cover plate 1 is further provided with a sink 12, which is arranged around the periphery of the welding process hole 11. The sink 12 blocks the flow path between the welding process hole 11 and the area of ​​the cover plate 1 outside the sink 12. When additional components are welded to the welding process hole 11, only the material of the cover plate 1 within the sink 12 and close to the center of the welding process hole 11 is affected. There is no possibility of material in the area of ​​the cover plate 1 outside the sink 12 melting or even moving toward the center of the welding process hole 11. This effectively reduces the deformation area of ​​the cover plate 1 near the welding process hole 11 and improves the geometric stability and performance of the cover plate 1.

[0048] In this embodiment, the horizontal cross-section of the sink 12 is annular, that is, the sink 12 is wrapped around the outer periphery of the welding process hole 11. Compared with the sink 12 composed of multiple annular trough structures arranged at intervals along the circumferential direction, it can not only reduce the difficulty of production and manufacturing, but also ensure that only the cover plate 1 material in the internal area of ​​the sink 12 melts and moves toward the center of the welding process hole 11, which facilitates the control of the welding process effect and quality.

[0049] In this embodiment, the vertical cross-sectional area of ​​the trough 12 gradually decreases along the direction from the opening of the trough 12 to the bottom of the trough 12. In this way, when the side wall material of the trough 12 close to the center of the welding process hole 11 melts, due to the gradual decrease in cross-sectional area, the side wall of the trough 12 away from the center of the welding process hole 11 will be subjected to less stress transfer, so that it can better maintain its shape and reduce the possibility of its deformation, thereby reducing the risk of melting and deformation of the material in the cover plate 1 area outside the trough 12.

[0050] In this embodiment, reference Figure 5 As shown, the welding process hole 11 includes a first hole 111, which is arranged through the cover plate 1 and is used to inject electrolyte into the battery shell; the additional components include a liquid injection sealing nail (not shown in the figure) and an explosion-proof valve assembly 31, the liquid injection sealing nail is arranged in the first hole 111, and is sealed and fitted with the inner wall of the first hole 111 and welded, and the explosion-proof valve assembly 31 is installed on the cover plate 1 so that when the internal air pressure of the battery is large, the battery will open the explosion-proof valve and discharge the gas out of the shell; the sink 12 includes a first groove 121, the first groove 121 is annular in structure, and is circumferentially arranged around the first hole 111.

[0051] Through the above-mentioned arrangement, during the process of welding the liquid injection sealing nail, the first groove 121 can cut off the possibility of movement of the cover plate 1 material between the first groove 121 and the explosion-proof valve assembly 31, and will only affect the cover plate 1 material between the first groove 121 and the first hole 111 when welding the liquid injection sealing nail, thereby eliminating the possibility that the cover plate 1 material between the first hole 111 and the explosion-proof valve assembly 31 will all move toward the center of the first hole 111 due to the welding of the liquid injection sealing nail, thereby causing poor welding of the explosion-proof valve assembly 31.

[0052] It should be noted that, in this embodiment, the first hole 111 includes a first stepped hole 1111 and a second stepped hole 1112. The first stepped hole 1111 and the second stepped hole 1112 are arranged in sequence along the direction from the top surface of the cover plate 1 to the bottom surface of the cover plate 1, and the aperture of the first stepped hole 1111 is larger than the aperture of the second stepped hole 1112. The liquid injection sealing nail is T-shaped and includes a large diameter section and a small diameter section. After the liquid injection sealing nail is inserted into the first hole 111, the large diameter section is sealed and fitted with the inner wall of the first stepped hole 1111 and welded, and the small diameter section is sealed and fitted with the inner wall of the second stepped hole 1112, and the second stepped surface is fitted and connected to the first stepped surface. Through the above arrangement, not only can the sealing surface area between the liquid injection sealing nail and the first hole 111 be effectively increased, thereby improving the sealing effect, but also the liquid injection sealing nail can be prevented from sinking and moving during the welding process, thereby ensuring the welding quality of the liquid injection sealing nail.

[0053] In this embodiment, to ensure that the first groove 121 maintains its shape and reduces the possibility of deformation during welding, the horizontal cross-sectional area of ​​the first groove 121 gradually decreases along the direction from the top surface of the cover plate 1 to the bottom surface of the cover plate 1. Exemplarily, the top diameter d1 of the first groove 121 ranges from d1 greater than or equal to 1 mm to less than or equal to 2 mm. For example, d1 is 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm. The bottom diameter d2 of the first groove 121 ranges from d2 greater than or equal to 0.6 mm to less than 1 mm. For example, d2 is 0.6 mm, 0.7 mm, 0.8 mm, or 0.9 mm.

[0054] Furthermore, in this embodiment, the depth of the first groove 121 is h1, and h1 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm. For example, h1 is 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. By setting the depth of the first groove 121 within the above range, it is not only possible to prevent the depth of the first groove 121 from exceeding the threshold and affecting the structural strength of the cover plate 1, but also to ensure that the material of the cover plate 1 in the area between the first groove 121 and the first hole 111 can respond in time during welding, melt, and move toward the first hole 111, thereby reducing the degree of impact on the material of the cover plate 1 in the area between the first groove 121 and the explosion-proof valve assembly 31.

[0055] Furthermore, in this embodiment, referring to Figure 3 As shown, the radial distance between the first groove 121 and the first hole 111 is m1, which is greater than or equal to 2 mm. The size of m1 is determined based on the external dimensions of the cover plate 1. By setting the radial distance between the first groove 121 and the first hole 111 within the above range, the impact of welding on the cover plate 1 material in the area between the first groove 121 and the explosion-proof valve assembly 31 can be further reduced, thereby ensuring the reliability of the sealed installation of the explosion-proof valve assembly 31 on the cover plate 1.

[0056] In this embodiment, reference Figure 6 As shown, the welding process hole 11 also includes a second hole 112, which is provided through the cover plate 1. The explosion-proof valve assembly 31 is provided in the second hole 112 and is sealed and welded to the inner wall of the second hole 112. The sink 12 includes a second groove 122, which is provided around the second hole 112. Preferably, the second hole 112 and the second groove 122 are both waist-shaped annular structures to match the shape of the explosion-proof valve assembly 31.

[0057] Through the above-mentioned arrangement, during the welding process of the explosion-proof valve assembly 31, the second groove 122 can cut off the possibility of the cover plate 1 material moving between the second groove 122 and the edge of the cover plate 1. When welding the explosion-proof valve assembly 31, only the cover plate 1 material between the second groove 122 and the second hole 112 will be affected, thereby eliminating the possibility of deformation of the cover plate 1 caused by the entire cover plate 1 material between the second hole 112 and the edge of the cover plate 1 moving toward the center of the second hole 112 due to the welding of the explosion-proof valve assembly 31. It should be noted that when welding the explosion-proof valve assembly 31, the length dimension of the cover plate 1 will not be substantially affected. Therefore, the main effect of the arrangement of the above-mentioned second groove 122 is to ensure that the width of the cover plate 1 will not suddenly shrink and deform, thereby avoiding structural failure of the cover plate 1, maintaining stable welding quality between the cover plate 1 and the battery shell, and ensuring that the weld is uniform and defect-free, thereby ensuring the sealing safety of the battery.

[0058] In this embodiment, the horizontal cross-sectional area of ​​the second groove 122 gradually decreases from the bottom surface of the cover plate 1 to the top surface of the cover plate 1. For example, the bottom diameter d3 of the second groove 122 ranges from d3 greater than or equal to 1 mm to less than or equal to 2 mm. For example, d3 is 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm. The top diameter d4 of the second groove 122 ranges from d2 greater than or equal to 0.6 mm to less than 1 mm. For example, d4 is 0.6 mm, 0.7 mm, 0.8 mm, or 0.9 mm.

[0059] Furthermore, in this embodiment, the depth of the second groove 122 is h2, and h2 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm. For example, h2 is 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. Similar to the principle of the first groove 121, by setting the depth of the second groove 122 within the above-mentioned range, it is possible not only to ensure that the structural strength of the cover plate 1 will not be reduced due to the excessive depth of the second groove 122, but also to enable the material of the cover plate 1 in the area between the second groove 122 and the second hole 112 to melt in time and move to the second hole 112 when welding the explosion-proof valve assembly 31, thereby preventing the melting and movement of the material of the cover plate 1 in the area between the second groove 122 and the explosion-proof valve assembly 31.

[0060] Furthermore, refer to Figure 3As shown, in this embodiment, the radial distance between the second groove 122 and the second hole 112 is m2, which is greater than or equal to 2 mm. The radial distance between the second groove 122 and the second hole 112 can be determined based on the external dimensions of the cover plate 1 and is not limited in this embodiment. By setting the radial distance between the second groove 122 and the second hole 112 within the above range, the impact of welding on the cover plate 1 material in the area between the second groove 122 and the edge of the cover plate 1 can be further reduced, thereby maintaining the dimensions of the cover plate 1 stable and preventing sudden shrinkage and deformation.

[0061] This embodiment also provides a top cover assembly, which has a square structure and is applied to square batteries. The top cover assembly includes a positive electrode post 21, a negative electrode post 22, an additional assembly, and the cover plate 1 of the above embodiment. The two ends of the surface of the cover plate 1 are penetrated by a post hole 13. The positive electrode post 21 is inserted into one of the post holes 13 for electrically connecting to the positive electrode tab of the battery cell. The negative electrode post 22 is inserted into the other post hole 13 for electrically connecting to the negative electrode tab of the battery cell so as to charge or discharge through the positive electrode post 21 and the negative electrode post 22. The additional assembly includes multiple components, such as a positive electrode aluminum block 32, a negative electrode aluminum block 33, a positive electrode upper plastic part 34, a negative electrode upper plastic part 35, a lower plastic part 36, a positive electrode sealing ring 37, a negative electrode sealing ring 38, a liquid injection sealing nail, and an explosion-proof valve assembly 31. Each component in the additional assembly is a commonly used component of square batteries in this field, so this embodiment will not further elaborate on the structure and function of the above components.

[0062] The above-mentioned cover plate 1 is provided with a sink groove 12 on the periphery of the external welding process hole 11, so that the sink groove 12 can block the flow path between the welding process hole 11 and the area of ​​the cover plate 1 outside the sink groove 12. When the additional components are welded, only the material of the cover plate 1 in the internal area of ​​the sink groove 12 and close to the center of the welding process hole 11 will be affected. There is no possibility that the material of the cover plate 1 outside the sink groove 12 will melt or even move toward the center of the welding process hole 11, thereby effectively reducing the deformation area of ​​the cover plate 1 near the welding process hole 11, improving the geometric stability and performance of the cover plate 1, and effectively increasing the production quality and stable reliability of the top cover assembly.

[0063] This embodiment also provides a battery comprising a housing, a battery cell, and the top cover assembly of the above embodiment, wherein the battery cell is disposed within the housing. Because the battery is manufactured using the above-described top cover assembly, the welding quality between the housing and the top cover assembly is excellent, ensuring the sealing and safety of the battery during use, extending the battery's service life, and saving costs.

[0064] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0065] Throughout this specification, references to terms such as "some embodiments" and "other embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0066] 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. A cover plate, applied to a top cover assembly of a battery, wherein the top cover assembly also includes an additional assembly, characterized in that: The cover plate (1) is provided with a welding process hole (11) and a sink groove (12); the additional component can be welded through the welding process hole (11) and positioned on the cover plate (1); and the sink groove (12) is arranged around the welding process hole (11).

2. The cover plate according to claim 1, wherein: The welding process hole (11) includes a first hole (111), and the first hole (111) is set through the cover plate (1), and the first hole (111) is used to inject electrolyte into the shell of the battery; The additional component comprises a liquid injection sealing nail and an explosion-proof valve component (31); the liquid injection sealing nail is arranged in the first hole (111) and is sealed and welded to the inner wall of the first hole (111); and the explosion-proof valve component (31) is installed on the cover plate (1); The sink (12) comprises a first groove (121), the first groove (121) is arranged around the first hole (111), and the first groove (121) is located between the liquid injection sealing nail and the explosion-proof valve assembly (31).

3. The cover plate according to claim 2, wherein: The first hole (111) comprises a first stepped hole (1111) and a second stepped hole (1112), and the first stepped hole (1111) and the second stepped hole (1112) are arranged in sequence along a direction from the top surface of the cover plate (1) to the bottom surface of the cover plate (1), and the aperture of the first stepped hole (1111) is larger than the aperture of the second stepped hole (1112), and a first stepped surface is formed between the first stepped hole (1111) and the second stepped hole (1112); The liquid injection sealing nail includes a large diameter section and a small diameter section, a second step surface is formed between the large diameter section and the small diameter section, the large diameter section is sealed and fitted with the inner wall of the first step hole (1111) and is welded, the small diameter section is sealed and fitted with the inner wall of the second step hole (1112), and the second step surface is fitted and connected to the first step surface.

4. The cover plate according to claim 2, wherein: The welding process hole (11) includes a second hole (112), and the second hole (112) is arranged through the cover plate (1); The explosion-proof valve assembly (31) is arranged in the second hole (112) and is sealed and welded to the inner wall of the second hole (112); The sink (12) comprises a second groove (122), and the second groove (122) is arranged around the second hole (112).

5. The cover plate according to claim 4, characterized in that: The radial distance between the first groove (121) and the first hole (111) is m1, and m1 is greater than or equal to 2 mm; And, the radial distance between the second groove (122) and the second hole (112) is m2, and m2 is greater than or equal to 2 mm.

6. The cover plate according to claim 4, characterized in that: The depth of the first groove (121) is h1, which is greater than or equal to 0.2 mm and less than or equal to 0.5 mm; And, the depth of the second groove (122) is h2, and h2 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

7. The cover plate according to any one of claims 1 to 6, characterized in that: The horizontal cross section of the trough (12) is annular.

8. The cover plate according to any one of claims 1 to 6, characterized in that: Along the direction from the opening of the trough (12) to the bottom of the trough (12), the vertical cross-sectional area of ​​the trough (12) gradually decreases.

9. Top cover assembly, characterized in that, The invention comprises a cover plate (1) according to any one of claims 1 to 8.

10. A battery, characterized in that The invention comprises a shell, a battery cell and the top cover assembly according to claim 9, wherein the battery cell is arranged in the shell, and the top cover assembly is arranged at the opening of the shell.

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