Cover plate assembly, battery and energy storage device

Abstract

The application provides a cover plate assembly, a battery and an energy storage device. The cover plate assembly comprises a top cover and a rupture disc, wherein the top cover comprises a body and a coating layer, the body is welded to the rupture disc, and the body and a welding position of the body and the rupture disc are located on the same side of the coating layer. In the cover plate assembly, welding is performed from the side of the rupture disc away from the top cover when the top cover and the rupture disc are welded, so that the welding position of the body and the rupture disc is located on the side of the coating layer facing the body, welding damage to the coating layer is avoided, the coating layer can stably prevent rust of the top cover, and rusting of the top cover is avoided.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to cover plate assemblies, batteries, and energy storage devices. Background Technology

[0002] Batteries are widely used in energy storage systems, transportation, and consumer electronics. A battery mainly consists of a casing, cover, and core.

[0003] The cover assembly is a crucial component of the battery. It typically includes a top cover and an explosion-proof diaphragm, with the top cover and diaphragm connected by welding. In related battery technologies, the top cover is prone to rusting. Utility Model Content

[0004] Embodiments of this application provide a cover plate assembly, a battery, and an energy storage device, which can improve technical problems such as the top cover being prone to rusting.

[0005] In a first aspect, embodiments of this application provide a cover assembly, including a top cover and an explosion-proof sheet, wherein, The top cover includes a body and a coating. The body is welded to the explosion-proof sheet, and the body and the welded part of the body to the explosion-proof sheet are located on the same side of the coating.

[0006] In one embodiment, the welding portion is spaced apart from the coating.

[0007] By adopting the above technical solution, it is ensured that the welding parts will not come into contact with the coating, thus preventing any impact on the coating. This ensures that the coating will not be damaged by the welding connection between the top cover and the explosion-proof sheet, allowing the coating to effectively protect the body from rust, preventing the top cover from rusting, and ensuring the continuity of the sealing path.

[0008] In one embodiment, the body includes a first connecting surface and a second connecting surface disposed opposite to each other, the coating is connected to the first connecting surface, and at least a portion of the second connecting surface is welded to the explosion-proof sheet.

[0009] By adopting the above technical solution, the welding parts of the body and the explosion-proof sheet can be spaced apart from the first connecting surface, thereby ensuring that the coating connected to the first connecting surface is spaced apart from the welding parts of the body and the explosion-proof sheet. This can effectively prevent the coating from being damaged by the welding between the top cover and the explosion-proof sheet, ensuring that the coating can play a stable anti-rust role for the top cover and preventing the top cover from rusting.

[0010] In one embodiment, the body and the explosion-proof sheet are connected by laser welding, and a molten pool is formed at the welding point of the body and the explosion-proof sheet, with the coating and the molten pool spaced apart.

[0011] By adopting the above technical solution, the explosion-proof sheet and the body are connected together by laser welding. During laser welding, a molten pool is generated at the welding point. By setting an interval between the coating and the molten pool, it is possible to prevent the coating from melting through during laser welding of the explosion-proof sheet and the body, thus ensuring the structural integrity of the coating. This allows the coating to provide stable rust protection for the top cover and prevent the top cover from rusting.

[0012] In one embodiment, the molten pool extends through the explosion-proof sheet and into the top cover, the depth of the molten pool extending into the top cover is L1, and the thickness of the top cover is L2, wherein 0.3≤L1 / L2≤0.7.

[0013] By adopting the above technical solution, the connection stability between the top cover and the explosion-proof sheet is ensured, while the molten pool can be prevented from affecting the coating, ensuring that the coating can play a stable anti-rust role for the top cover and preventing the top cover from rusting.

[0014] In one embodiment, the explosion-proof sheet is welded to the top cover, such that a welding surface is formed on the side of the explosion-proof sheet facing away from the top cover; The cover plate assembly also includes a separator that covers the welding surface and is used to seal and separate the welding surface.

[0015] By adopting the above technical solution, the welding surface of the explosion-proof sheet on the side away from the top cover can be separated from other substances by the separator, preventing the welding surface from rusting and corroding due to contact with substances such as electrolyte.

[0016] In one embodiment, one of the separator and the explosion-proof sheet has a snap-fit ​​groove, and the other of the separator and the explosion-proof sheet has a snap-fit ​​protrusion, which snaps into the snap-fit ​​groove.

[0017] By adopting the above technical solution, the snap-fit ​​protrusion and snap-fit ​​groove can be used to snap-fit ​​the separator and the explosion-proof sheet together, which improves the connection stability between the separator and the explosion-proof sheet and ensures that the separator can stably seal and separate the welded surface.

[0018] In one embodiment, the explosion-proof sheet has the snap-fit ​​groove, and the welding surface is spaced apart from the snap-fit ​​groove.

[0019] By adopting the above technical solution and setting the welding surface and the snap-fit ​​groove at intervals, damage to the structure of the snap-fit ​​groove due to welding can be avoided, ensuring that the explosion-proof plate and the separator can be stably connected together by snap-fit.

[0020] Meanwhile, if the explosion-proof sheet and the top cover are welded together at the snap-fit ​​groove, the explosion-proof sheet at the snap-fit ​​groove is relatively thin, which may easily lead to unstable welding connection between the explosion-proof sheet and the top cover or damage to the coating. Therefore, setting the welding surface and the snap-fit ​​groove at an interval can effectively avoid the above problems.

[0021] In one embodiment, the explosion-proof sheet has at least two of the snap-fit ​​grooves, and the welding surface is located between the two snap-fit ​​grooves.

[0022] By adopting the above technical solution, the separator has at least two snap-fit ​​protrusions, each corresponding to one of at least two snap-fit ​​grooves. Since the snap-fit ​​protrusions snap into the snap-fit ​​grooves, the connection between the separator and the explosion-proof sheet between the two snap-fit ​​grooves is relatively tight. Therefore, designing the welding surface between the two snap-fit ​​grooves can effectively ensure the sealing and separation effect of the separator on the welding surface, preventing electrolytes and other substances from seeping into the welding surface from between the separator and the explosion-proof sheet.

[0023] In one embodiment, the distance from the center of the welding surface to the snap-fit ​​groove is greater than or equal to 1 mm.

[0024] By adopting the above technical solution, if the distance from the center of the welding surface to the snap-fit ​​groove is less than 1mm, the distance is too close, and the structure of the snap-fit ​​groove may be easily damaged when welding the explosion-proof sheet and the top cover. Therefore, in this embodiment, the distance from the center of the welding surface to the snap-fit ​​groove is designed to be greater than or equal to 1mm to ensure the smooth welding connection between the explosion-proof sheet and the top cover without damaging the structure of the snap-fit ​​groove.

[0025] In one embodiment, the cover assembly further includes a perforated plate disposed on the side of the explosion-proof sheet opposite to the top cover, and the separator is located between the perforated plate and the explosion-proof sheet.

[0026] By adopting the above technical solution, the separator is sandwiched between the orifice plate and the explosion-proof sheet, which improves the installation stability of the separator and enables the separator to effectively seal and separate the welding surface.

[0027] In one embodiment, the separator includes a seal that seals the connection between the orifice plate and the explosion-proof sheet.

[0028] By adopting the above technical solution, the separator can not only seal the welded surfaces, but also seal the connecting orifice plate and the explosion-proof plate, thereby improving the sealing performance between the orifice plate and the explosion-proof plate and effectively improving the sealing performance of the cover plate assembly.

[0029] Secondly, embodiments of this application provide a battery including the cover assembly described above.

[0030] Thirdly, embodiments of this application provide an energy storage device, including the battery described above.

[0031] The beneficial effects of the embodiments of this application are as follows: In the embodiments of this application, when welding the top cover and the explosion-proof sheet, welding is performed from the side of the explosion-proof sheet away from the top cover, so that the welding part of the body and the explosion-proof sheet is located on the side of the coating facing the body, avoiding welding damage to the coating, ensuring that the coating can play a stable anti-rust role for the top cover, and preventing the top cover from rusting. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the cover plate assembly provided in an embodiment of this application; Figure 2 This is provided by the embodiments of this application. Figure 1 Enlarged structural diagram at point A; Figure 3 This is a partial structural schematic diagram of the cover plate assembly provided in an embodiment of this application; Figure 4 This is an exploded view of the cover plate assembly provided in an embodiment of this application; Figure 5 This is a schematic diagram of the assembly of the separator and the explosion-proof sheet provided in the embodiments of this application.

[0034] Explanation of reference numerals in the attached figures: 1. Top cover; 2. Explosion-proof sheet; 3. Welding part; 4. Separator; 5. Snap-fit ​​groove; 6. Snap-fit ​​protrusion; 7. Orifice plate; 11. Body; 12. Coating; 21. Welding surface; 31. Molten pool; 41. Sealing element; 111. First connecting surface; 112. Second connecting surface. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0036] The following is combined Figures 1 to 5 This application describes the cover plate assembly, battery, and energy storage device.

[0037] According to the embodiments of the first aspect of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the cover assembly includes a top cover 1 and an explosion-proof sheet 2. The top cover 1 includes a body 11 and a coating 12. The body 11 is welded to the explosion-proof sheet 2, and the body 11 and the welding part 3 between the body 11 and the explosion-proof sheet 2 are located on the same side of the coating.

[0038] According to the cover assembly of the present application embodiment, when welding the top cover 1 and the explosion-proof sheet 2, welding is performed from the side of the explosion-proof sheet 2 away from the top cover 1, so that the welding part 3 between the body 11 and the explosion-proof sheet 2 is located on the side of the coating 12 facing the body 11, avoiding welding damage to the coating 12, ensuring that the coating 12 can play a stable anti-rust role for the top cover 1, and preventing the top cover 1 from rusting.

[0039] In some examples, the weld portion 3 may extend to the body 11 but not penetrate it, so that the weld portion 3 does not come into contact with the coating 12, thus avoiding damage to the coating 12. Alternatively, the weld portion 3 may penetrate the body 11 but not extend into the coating 12, to ensure the integrity of the coating 12.

[0040] Understandably, in related technologies, when welding the top cover 1 and the explosion-proof sheet 2, welding is generally performed from the side of the top cover 1 away from the explosion-proof sheet 2. This inevitably causes the welded part 3 to penetrate the coating 12, damaging the coating 12 and making the welded area of ​​the top cover 1 prone to rusting. However, this application welds from the side of the explosion-proof sheet 2 away from the top cover 1, placing the welded part 3 on the side of the coating 12 facing the body 11. This effectively avoids damaging the coating 12 during welding, ensuring that the coating 12 provides stable and effective rust prevention for the top cover 1, preventing it from rusting.

[0041] In some examples, the connection part of the explosion-proof sheet 2 is welded to the body 11, and the connection part of the explosion-proof sheet 2, the body 11, and the coating 12 are stacked in sequence.

[0042] In some embodiments, such as Figure 2 and Figure 3 As shown, the welding part 3 and the coating 12 are spaced apart.

[0043] In this way, the welding part 3 will not come into contact with the coating 12, and thus will not affect the coating 12. This ensures that the coating 12 will not be damaged by the welding connection between the top cover 1 and the explosion-proof sheet 2, so that the coating 12 can effectively protect the body 11 from rust and prevent the top cover 1 from rusting.

[0044] In some embodiments, such as Figure 3 and Figure 4 As shown, the body 11 is welded to the explosion-proof sheet 2 on the side facing the explosion-proof sheet 2.

[0045] Thus, the welding position between the body 11 and the explosion-proof sheet 2 is located on one side of the body 11, while the coating 12 is located on the other side of the body 11. This ensures that the welding between the body 11 and the explosion-proof sheet 2 will not affect the coating 12, thus preventing the coating 12 from being damaged by welding. This ensures that the coating 12 can effectively protect the body 11 from rust, thereby preventing the top cover 1 from rusting.

[0046] In some embodiments, such as Figure 3 and Figure 4 As shown, the body 11 includes a first connecting surface 111 and a second connecting surface 112 disposed opposite to each other. The coating 12 is connected to the first connecting surface 111, and at least a portion of the second connecting surface 112 is welded to the explosion-proof sheet 2.

[0047] In this way, the welding part 3 between the main body 11 and the explosion-proof sheet 2 can be spaced apart from the first connecting surface 111, thereby ensuring that the coating 12 connected to the first connecting surface 111 is spaced apart from the welding part 3 between the main body 11 and the explosion-proof sheet 2. This can effectively prevent the coating 12 from being damaged by the welding between the top cover 1 and the explosion-proof sheet 2, ensuring that the coating 12 can play a stable anti-rust role for the top cover 1 and prevent the top cover 1 from rusting.

[0048] In some embodiments, such as Figure 2 and Figure 3 As shown, the body 11 and the explosion-proof sheet 2 are connected by laser welding. A molten pool 31 is formed at the welding part 3 of the body 11 and the explosion-proof sheet 2. The coating 12 is spaced apart from the molten pool 31.

[0049] It is understandable that when the explosion-proof sheet 2 and the body 11 are connected by laser welding, a molten pool 31 will be generated at the welding point 3 during laser welding. By setting the coating 12 and the molten pool 31 alternately, the coating 12 can be prevented from melting through during laser welding of the explosion-proof sheet 2 and the body 11, thus ensuring the structural integrity of the coating 12. This allows the coating 12 to provide stable rust prevention for the top cover 1 and prevent the top cover 1 from rusting.

[0050] In some embodiments, such as Figure 3 and Figure 4 As shown, the molten pool 31 penetrates the explosion-proof sheet 2 and extends to the top cover 1. The depth of the molten pool 31 extending into the top cover 1 is L1, and the thickness of the top cover 1 is L2, wherein 0.3≤L1 / L2≤0.7.

[0051] It is understandable that if the ratio of the depth of the molten pool 31 extending into the top cover 1 to the thickness of the top cover 1 is less than 0.3, it indicates that the depth of the molten pool 31 extending into the top cover 1 is insufficient, which may lead to insufficient connection stability between the top cover 1 and the explosion-proof sheet 2. If the ratio of the depth of the molten pool 31 extending into the top cover 1 to the thickness of the top cover 1 is greater than 0.7, the molten pool 31 is likely to affect the coating 12, such as causing the coating 12 to melt. Therefore, in this embodiment, the ratio of the depth of the molten pool 31 extending into the top cover 1 to the thickness of the top cover 1 is set between 0.3 and 0.7, ensuring the connection stability between the top cover 1 and the explosion-proof sheet 2, while avoiding the molten pool 31 affecting the coating 12, ensuring that the coating 12 can play a stable anti-rust role for the top cover 1, and preventing the top cover 1 from rusting.

[0052] In some embodiments, such as Figure 3 and Figure 4 As shown, the explosion-proof sheet 2 is welded to the top cover 1 so that a welding surface 21 is formed on the side of the explosion-proof sheet 2 facing away from the top cover 1; The cover plate assembly also includes a separator 4, which covers the welding surface 21 and is used to seal and separate the welding surface 21.

[0053] Thus, the separator 4 can separate the welding surface 21 of the explosion-proof sheet 2 away from the top cover 1 from other substances, preventing the welding surface 21 from rusting or corroding due to contact with substances such as electrolyte.

[0054] It is understandable that the explosion-proof sheet 2 and the top cover 1 are welded together from the side of the explosion-proof sheet 2 away from the top cover 1. Since the welding part 3 does not penetrate the coating 12, this means that only the welding surface 21 on the side of the explosion-proof sheet 2 away from the top cover 1 is exposed. In this embodiment, the separator 4 is used to seal and separate the welding surface 21, thus separating the welding surface 21 from the electrolyte inside the battery, protecting the welding surface 21 and preventing corrosion caused by the electrolyte.

[0055] In some embodiments, such as Figure 3 , Figure 4 and Figure 5 As shown, one of the separator 4 and the explosion-proof sheet 2 has a snap-fit ​​groove 5, and the other of the separator 4 and the explosion-proof sheet 2 has a snap-fit ​​protrusion 6, which snaps into the snap-fit ​​groove 5.

[0056] Thus, through the snap-fit ​​engagement of the snap-fit ​​protrusion 6 and the snap-fit ​​groove 5, the separator 4 and the explosion-proof sheet 2 can be snap-fitted together, which improves the connection stability between the separator 4 and the explosion-proof sheet 2 and ensures that the separator 4 can stably play a sealing and separating role on the welding surface 21.

[0057] In some examples, the separator 4 may have a snap-fit ​​groove 5, and the explosion-proof sheet 2 may have a snap-fit ​​protrusion 6. Alternatively, the separator 4 may have a snap-fit ​​protrusion 6, and the explosion-proof sheet 2 may have a snap-fit ​​groove 5.

[0058] In some embodiments, such as Figure 3 , Figure 4 and Figure 5 As shown, the explosion-proof sheet 2 has the snap-fit ​​groove 5, and the welding surface 21 is spaced apart from the snap-fit ​​groove 5.

[0059] In this way, by setting the welding surface 21 and the snap-fit ​​groove 5 at intervals, the structure of the snap-fit ​​groove 5 can be avoided from being damaged by welding, and the explosion-proof sheet 2 and the separator 4 can be stably connected together by snap-fit.

[0060] Meanwhile, if the explosion-proof sheet 2 and the top cover 1 are welded together at the snap-fit ​​groove 5, the explosion-proof sheet 2 at the snap-fit ​​groove 5 is relatively thin, which may easily lead to unstable welding connection between the explosion-proof sheet 2 and the top cover 1 or damage to the coating 12. Therefore, by setting the welding surface 21 and the snap-fit ​​groove 5 at intervals, the above problems can be effectively avoided.

[0061] In some embodiments, such as Figure 3 , Figure 4 and Figure 5 As shown, the explosion-proof sheet 2 has at least two snap-fit ​​grooves 5, and the welding surface 21 is located between the two snap-fit ​​grooves 5.

[0062] In this way, the connection stability between the separator 4 and the explosion-proof plate 2 can be effectively improved.

[0063] It is understandable that the separator 4 has at least two snap-fit ​​protrusions 6, and the at least two snap-fit ​​protrusions 6 correspond one-to-one with at least two snap-fit ​​grooves 5. Since the snap-fit ​​protrusions 6 snap into the snap-fit ​​grooves 5, the connection between the separator 4 and the explosion-proof sheet 2 between the two snap-fit ​​grooves 5 is relatively tight. Therefore, designing the welding surface 21 between the two snap-fit ​​grooves 5 can effectively ensure the sealing and separation effect of the separator 4 on the welding surface 21, preventing electrolyte and other substances from seeping into the welding surface 21 from between the separator 4 and the explosion-proof sheet 2.

[0064] In some embodiments, the distance from the center of the welding surface 21 to the snap-fit ​​groove 5 is greater than or equal to 1 mm.

[0065] It is understandable that if the distance from the center of the welding surface 21 to the snap-fit ​​groove 5 is less than 1mm, the distance is too close, and the structure of the snap-fit ​​groove 5 may be damaged when welding the explosion-proof sheet 2 and the top cover 1. Therefore, in this embodiment, the distance from the center of the welding surface 21 to the snap-fit ​​groove 5 is designed to be greater than or equal to 1mm to ensure the smooth welding connection between the explosion-proof sheet 2 and the top cover 1 without damaging the structure of the snap-fit ​​groove 5.

[0066] In some examples, the distance between the solder line at the top cover 1 and the snap-fit ​​groove 5 is greater than or equal to 1 mm.

[0067] In some embodiments, such as Figure 1 As shown, the cover plate assembly also includes a perforated plate 7, which is disposed on the side of the explosion-proof sheet 2 away from the top cover 1, and the separator 4 is located between the perforated plate 7 and the explosion-proof sheet 2.

[0068] Thus, the separator 4 is sandwiched between the orifice plate 7 and the explosion-proof sheet 2, which improves the installation stability of the separator 4 and enables the separator 4 to effectively seal and separate the welded surface 21.

[0069] In some embodiments, such as Figure 2 The separator 4 includes a sealing element 41, which seals the connection between the perforated plate 7 and the explosion-proof sheet 2.

[0070] Thus, the separator 4 can not only seal the welded surface 21, but also seal the connecting orifice plate 7 and the explosion-proof sheet 2, thereby improving the sealing performance between the orifice plate 7 and the explosion-proof sheet 2 and effectively improving the sealing performance of the cover plate assembly.

[0071] In some examples, seal 41 is, for example, a sealing ring or gasket or any other suitable structural component with a sealing separation function.

[0072] In some examples, when assembling the perforated plate 7 with the explosion-proof sheet 2, the center of the perforated plate 7 is aligned with the center of the explosion-proof sheet 2. The pit at the center of the perforated plate 7 faces the laser source, enabling the welded connection between the perforated plate 7 and the explosion-proof sheet 2. The welding method can be multi-point welding, ring welding, or other methods.

[0073] According to an embodiment of the second aspect of this application, the battery includes the cover assembly described above.

[0074] According to the battery embodiment of this application, when welding the top cover 1 and the explosion-proof sheet 2, welding is performed from the side of the explosion-proof sheet 2 away from the top cover 1, so that the welding part 3 between the body 11 and the explosion-proof sheet 2 is located on the side of the coating 12 facing the body 11. This avoids welding damage to the coating 12, ensuring that the coating 12 can play a stable anti-rust role for the top cover 1, preventing the top cover 1 from rusting, and thus preventing the battery from short-circuiting due to the top cover 1 rusting, thereby improving the stability of the battery.

[0075] According to an embodiment of the third aspect of this application, the energy storage device includes the battery described above.

[0076] According to the energy storage device of this application embodiment, when welding the top cover 1 and the explosion-proof sheet 2, welding is performed from the side of the explosion-proof sheet 2 away from the top cover 1, so that the welding part 3 between the body 11 and the explosion-proof sheet 2 is located on the side of the coating 12 facing the body 11. This avoids welding damage to the coating 12, ensuring that the coating 12 can play a stable anti-rust role for the top cover 1, preventing the top cover 1 from rusting, thereby preventing the battery from short-circuiting due to the top cover 1 rusting, improving the stability of the battery, and thus improving the stability of the energy storage device.

[0077] It should be noted that energy storage devices can include energy storage power supplies, medical devices, smart cities, etc. It is important to note that the above are merely illustrative examples of energy storage devices and do not impose any specific limitations on them.

[0078] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A cover plate assembly, characterized in that, Including the top cover and explosion-proof plate, among which, The top cover includes a body and a coating. The body is welded to the explosion-proof sheet, and the body and the welded part of the body to the explosion-proof sheet are located on the same side of the coating.

2. The cover plate assembly according to claim 1, characterized in that, The welding area is spaced apart from the coating.

3. The cover plate assembly according to claim 1, characterized in that, The body includes a first connecting surface and a second connecting surface that are disposed opposite to each other. The coating is connected to the first connecting surface, and at least a portion of the second connecting surface is welded to the explosion-proof sheet.

4. The cover plate assembly according to claim 1, characterized in that, The body and the explosion-proof sheet are connected by laser welding. A molten pool is formed at the welding point between the body and the explosion-proof sheet, and the coating is spaced apart from the molten pool.

5. The cover plate assembly according to claim 4, characterized in that, The molten pool extends through the explosion-proof sheet and into the top cover. The depth of the molten pool extending into the top cover is L1, and the thickness of the top cover is L2, wherein 0.3≤L1 / L2≤0.

7.

6. The cover plate assembly according to any one of claims 1 to 4, characterized in that, The explosion-proof sheet is welded to the top cover so that a welding surface is formed on the side of the explosion-proof sheet away from the top cover; The cover plate assembly also includes a separator that covers the welding surface and is used to seal and separate the welding surface.

7. The cover plate assembly according to claim 6, characterized in that, One of the separator and the explosion-proof sheet has a snap-fit ​​groove, and the other of the separator and the explosion-proof sheet has a snap-fit ​​protrusion, which snaps into the snap-fit ​​groove.

8. The cover plate assembly according to claim 7, characterized in that, The explosion-proof sheet has the snap-fit ​​groove, and the welding surface is spaced apart from the snap-fit ​​groove.

9. The cover plate assembly according to claim 8, characterized in that, The explosion-proof sheet has at least two snap-fit ​​grooves, and the welding surface is located between the two snap-fit ​​grooves.

10. The cover plate assembly according to claim 8, characterized in that, The distance from the center of the welding surface to the snap-fit ​​groove is greater than or equal to 1 mm.

11. The cover plate assembly according to claim 6, characterized in that, The cover plate assembly also includes a perforated plate, which is disposed on the side of the explosion-proof sheet opposite to the top cover, and the separator is located between the perforated plate and the explosion-proof sheet.

12. The cover plate assembly according to claim 11, characterized in that, The separator includes a seal that seals the connection between the orifice plate and the explosion-proof sheet.

13. A battery, characterized in that, Includes the cover plate assembly as described in any one of claims 1 to 12.

14. An energy storage device, characterized in that, Includes the battery as described in claim 13.

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