Cover plate assembly and battery cell

Abstract

The application provides a cover plate assembly and an electric core, and relates to the technical field of batteries. The top cover sheet of the cover plate assembly is provided with an explosion-proof hole and a convex ring. The outer edge of a welding ring is welded with the inner edge of the convex ring to form a welding part. An assembly space is formed between the welding ring and the top cover sheet. A pressing ring is movably arranged in the assembly space. When the pressing ring is rotated to a first position relative to the welding ring, the welding ring limits the pressing ring in the assembly space. When the pressing ring is rotated to a second position relative to the welding ring, the pressing ring can pass through the welding ring. An explosion-proof valve and a sealing ring are sealed and assembled in the explosion-proof hole by the pressing ring. The thickness of the sealing ring in a natural state is a mm, and the thickness of the sealing ring after being compressed is b mm. The area of a pressing region between the sealing ring and the explosion-proof valve is S mm. 2 The material yield strength of the welding part is δ MPa, the circumference of the welding part is D mm, and the welding penetration of the welding part is e mm. In this way, the structural stability of the detachable explosion-proof valve in an assembled state is ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a cover plate assembly and a battery cell. Background Technology

[0002] In the battery cell structure, the explosion-proof valve plays an important role in ensuring the safety of the battery cell. When the battery cell experiences thermal runaway, it will generate a large amount of gas, which will cause excessive internal pressure. When the gas pressure reaches a certain value, the explosion-proof valve will open to release the internal gas and prevent the battery cell from side-spraying and exploding.

[0003] Explosion-proof valves are typically fixed to a cover plate by welding or integral stamping. Once assembled, they cannot be disassembled. During the battery cell manufacturing process, transportation, or operating conditions, the explosion-proof valve may accidentally open or abnormally rupture, resulting in the scrapping of the entire battery cell. Related technologies have introduced designs for detachable explosion-proof valves; however, ensuring stability in the assembled state remains a focus of research for those skilled in the art. Summary of the Invention

[0004] In view of this, this application provides a cover plate assembly and a battery cell to solve the problem of how to ensure the structural stability of a detachable explosion-proof valve in the assembled state in the prior art.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A cover plate assembly, comprising:

[0007] The top cover plate has an explosion-proof hole that extends through a first direction. The top cover plate has a protruding ring that protrudes around the explosion-proof hole and along the first direction. The first direction is the thickness direction of the top cover plate.

[0008] The outer edge of the welding ring is welded to the inner edge of the convex ring to form a welding part, and an assembly space communicating with the explosion-proof hole is formed between the welding ring and the top cover plate.

[0009] A pressure ring is movably disposed in the assembly space. When the pressure ring rotates relative to the welding ring to a first position, the welding ring limits the pressure ring in the assembly space. When the pressure ring rotates relative to the welding ring to a second position, the pressure ring can pass through the welding ring along the first direction.

[0010] An explosion-proof valve and a sealing ring are pressed and sealed in the explosion-proof hole by the pressure ring, and both the explosion-proof valve and the sealing ring can pass through the welding ring along the first direction;

[0011] Wherein, the thickness of the sealing ring in its natural state is a mm, the thickness of the sealing ring after being compressed in the explosion-proof hole is b mm, and the area of ​​the pressing region between the sealing ring and the explosion-proof valve is S mm. 2 The yield strength of the material of the welded part is δMPa, the perimeter of the welded part is Dmm, and the weld penetration depth of the welded part in the first direction is emm. .

[0012] Optionally, the inner edge of the welding ring is provided with a notch that is recessed inward along the radial direction of the welding ring;

[0013] The outer edge of the pressure ring is provided with a stop extending radially outward along the pressure ring;

[0014] When the stop body and the notch are directly opposite each other along the first direction, the pressure ring is located in the first position, and the stop body can pass through the notch along the first direction so that the pressure ring can pass through the welding ring; when the stop body and the notch are misaligned, the pressure ring is located in the second position, and the welding ring forms a stop on the pressure ring.

[0015] Optionally, the pressure ring is provided with a tooling hole for insertion into a tooling, so that the pressure ring can rotate under the drive of the tooling.

[0016] Optionally, the inner wall of the explosion-proof hole is provided with a first limiting step and a second limiting step distributed along the first direction, and the second limiting step is close to the assembly space.

[0017] The sealing ring is pressed onto the first limiting step, and the explosion-proof valve is partially pressed onto the second limiting step and partially pressed onto the sealing ring.

[0018] Optionally, the welding ring includes a first ring portion, a second ring portion, and a third ring portion. The first ring portion is in contact with the outer surface of the top cover plate, the third ring portion is away from the top cover plate relative to the first ring portion, and the third ring portion is at least partially pressed onto the pressure ring. The second ring portion is transitionally connected between the first ring portion and the third ring portion.

[0019] The outer edge of the first ring is welded to the inner edge of the convex ring.

[0020] Optional, 0.25≤(ab) / a≤0.6.

[0021] Optionally, on a plane perpendicular to the first direction, the width of the crimping area between the sealing ring and the explosion-proof valve is cmm, where c ≥ 0.5.

[0022] Optional, e ≥ 0.5; and / or,

[0023] The thickness of the welded ring in the first direction is f mm, where f ≥ 0.7.

[0024] Optionally, on a plane perpendicular to the first direction, the width of the pressing area between the pressure ring and the welding ring is d mm, where d ≥ 0.5.

[0025] A battery cell comprising the cover assembly described in any of the preceding claims.

[0026] The cover plate assembly provided in this application includes a top cover plate, a welding ring, a pressure ring, an explosion-proof valve, and a sealing ring. The top cover plate has an explosion-proof hole extending along a first direction. A convex ring protrudes from the circumference of the explosion-proof hole along the first direction, which is the thickness direction of the top cover plate. The outer edge of the welding ring is welded to the inner edge of the convex ring to form a welded portion. An assembly space communicating with the explosion-proof hole is formed between the welding ring and the top cover plate. The pressure ring is movably disposed in the assembly space. When the pressure ring rotates relative to the welding ring to a first position, the welding ring limits the pressure ring within the assembly space. When the pressure ring rotates relative to the welding ring to a second position, the pressure ring can pass through the welding ring along the first direction. The explosion-proof valve and the sealing ring are pressed and sealed within the explosion-proof hole by the pressure ring, and both the explosion-proof valve and the sealing ring can pass through the welding ring along the first direction. The thickness of the sealing ring in its natural state is a mm, the thickness of the sealing ring after compression in the explosion-proof hole is b mm, and the area of ​​the pressing region between the sealing ring and the explosion-proof valve is S mm. 2 The yield strength of the welded part is δMPa, the perimeter of the welded part is Dmm, and the weld penetration depth in the first direction is emm. .

[0027] This configuration creates an inseparable integrated structure between the welding ring and the top cover plate. During assembly, the explosion-proof valve and sealing ring are placed into the explosion-proof hole. The pressure ring, in its second position, passes through the welding ring and is placed into the assembly space between the top cover plate and the welding ring. The pressure ring is then rotated to its first position, securing it between the welding ring and the top cover plate. Simultaneously, the explosion-proof valve and sealing ring are sealed in the explosion-proof hole under the pressure of the pressure ring, thus completing the assembly of the explosion-proof valve. If the explosion-proof valve breaks unexpectedly and needs replacement, rotating the pressure ring to the second position allows it to be removed. Therefore, the sealing ring and the explosion-proof valve... The explosion-proof valve can also be easily removed, enabling convenient replacement. Simultaneously, the welding ring is fixed to the surface of the top cover plate by welding to create an assembly space, which is easy to manufacture. Furthermore, the correlation between the weld penetration of the welding ring and the compression of the sealing ring was investigated. When this relationship is satisfied, it indicates that the weld strength is not less than the rebound force generated after the sealing ring is compressed, and the welding ring has sufficiently high stability and will not fail. This ensures the stable and reliable assembly of the explosion-proof valve, solving the problem of how to guarantee the structural stability of the detachable explosion-proof valve in the assembled state in existing technologies. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 This is an exploded view of the cover plate assembly provided in an embodiment of this application.

[0030] Figure 2 This is an assembly diagram of the cover plate assembly provided in an embodiment of this application.

[0031] Figure 3 This is a schematic diagram of a welding ring provided in an embodiment of this application.

[0032] Figure 4 This is a schematic diagram of the pressure ring provided in an embodiment of this application.

[0033] Figure 5 This is a top view of the cover plate assembly provided in an embodiment of this application.

[0034] Figure 6 for Figure 5 Sectional view at point AA.

[0035] Figure 7 for Figure 6 Detailed view of point B in the middle.

[0036] Figure 8 for Figure 7 Dimensioning diagram.

[0037] Figure 9 This is a dimensioning diagram of the sealing ring provided in an embodiment of this application.

[0038] exist Figures 1-9 middle:

[0039] 100. Top cover plate; 200. Welding ring; 300. Explosion-proof valve; 400. Sealing ring; 500. Pressure ring; 600. Electrode terminal;

[0040] 101. Explosion-proof hole; 102. First limiting step; 103. Second limiting step; 104. Protruding ring; 105. Welded part;

[0041] 201. Assembly space; 202. Notch;

[0042] 210. First ring section; 220. Second ring section; 230. Third ring section;

[0043] 501, Stop body; 502, Tooling hole. Detailed Implementation

[0044] 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 some embodiments of this application, and not all 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.

[0045] like Figures 1-9 As shown, this application provides a cover plate assembly, including a top cover plate 100, a welding ring 200, a pressure ring 500, an explosion-proof valve 300, and a sealing ring 400. The top cover plate 100 has an explosion-proof hole 101 extending along a first direction. The top cover plate 100 has a protruding ring 104 located circumferentially to the explosion-proof hole 101 and protruding along the first direction, which is the thickness direction of the top cover plate 100. The outer edge of the welding ring 200 is welded to the inner edge of the protruding ring 104 to form a welded portion 105. An assembly space 201 communicating with the explosion-proof hole 101 is formed between the welding ring 200 and the top cover plate 100. The pressure ring 500 is movably disposed in the assembly space 201. When the pressure ring 500 rotates relative to the welding ring 200 to a first position, the welding ring 200 limits the pressure ring 500 in the assembly space 201. When the pressure ring 500 rotates to the second position relative to the welding ring 200, the pressure ring 500 can pass through the welding ring 200 along the first direction, so that the pressure ring 500 can be detachably assembled in the assembly space 201; the explosion-proof valve 300 and the sealing ring 400 are pressed and sealed in the explosion-proof hole 101 by the pressure ring 500, and both the explosion-proof valve 300 and the sealing ring 400 can pass through the welding ring 200 along the first direction; wherein, the thickness of the sealing ring 400 in its natural state (i.e., the initial thickness) is a mm, i.e., a millimeters, and the thickness of the sealing ring 400 after being compressed in the explosion-proof hole 101 is b mm, i.e., b millimeters, (ab) / a is the compression amount of the sealing ring 400, the thickness of the sealing ring 400 is the dimension in the first direction, and the area of ​​the pressing area between the sealing ring 400 and the explosion-proof valve 300 is S mm. 2 That is, S square millimeters; the yield strength of the material of weld 105 is δ MPa, or δ megapascals; the perimeter of weld 105 is D mm, or D millimeters; and the weld penetration depth of weld 105 in the first direction is e mm, or e millimeters. In other words, the values ​​of the above parameters in the above units conform to this relationship.

[0046] With this configuration, the welding ring 200 and the top cover plate 100 form an inseparable integral structure. During assembly, the explosion-proof valve 300 and the sealing ring 400 are placed into the explosion-proof hole 101. The pressure ring 500, in its second position, passes through the welding ring 200 and is placed into the assembly space 201 between the top cover plate 100 and the welding ring 200. Then, the pressure ring 500 is rotated to its first position, thus securing the pressure ring 500 between the welding ring 200 and the top cover plate 100. Simultaneously, the explosion-proof valve 300 and the sealing ring 400 are sealed in the explosion-proof hole 101 under the pressure of the pressure ring 500, completing the assembly of the explosion-proof valve 300. If the explosion-proof valve 300 breaks unexpectedly and needs to be replaced, the pressure ring 500 can be removed by rotating it to the second position. Therefore, the sealing ring 400 and the explosion-proof valve 300 can be easily removed, enabling convenient replacement of the explosion-proof valve 300. Simultaneously, the welding ring 200 is fixed to the surface of the top cover plate 100 by welding to create the assembly space 201, which is easy to manufacture. Furthermore, the correlation between the weld penetration of the welding ring 200 and the compression of the sealing ring 400 was investigated. Through extensive testing, verification, and data fitting, it was found that when the above relationship is satisfied, it indicates that the weld strength is not less than the rebound force generated after the sealing ring 400 is compressed, and the stability of the welding ring 200 is sufficiently high and will not fail, thus ensuring the assembly stability and reliability of the explosion-proof valve 300. This solves the problem in the prior art of ensuring the structural stability of the detachable explosion-proof valve 300 in the assembled state.

[0047] Regarding the material selection of the aforementioned components, the welding ring 200 and the top cover plate 100 may be made of the same material, preferably aluminum. The yield strength of the material of the welding part 105 is an inherent property of the material, and the yield strength of aluminum is generally 70 MPa. The pressure ring 500 may be made of aluminum or steel, preferably steel.

[0048] It should be noted that after the explosion-proof valve 300 is sealed and assembled in the explosion-proof port 101, the positional relationship between the explosion-proof valve 300 and the sealing ring 400 can be one of the following two situations: Figure 7 and Figure 8 As shown, the sealing ring 400 is pressed onto the first limiting step 102, the explosion-proof valve 300 is pressed onto the sealing ring 400, and thus the pressure ring 500 is pressed onto the sealing ring 400; or, the explosion-proof valve 300 is pressed onto the first limiting step 102, the sealing ring 400 is pressed onto the explosion-proof valve 300, and thus the pressure ring 500 is pressed onto the sealing ring 400, which is also feasible.

[0049] In addition, the test process was recorded in this application, forming eight embodiments and three comparative examples comparing the relationship between welding strength and sealing ring elasticity, as detailed in Table 1. The following embodiments and comparative examples further illustrate the content disclosed in this application. These embodiments are merely illustrative, as various modifications and changes within the scope of the disclosure of this application will be apparent to those skilled in the art.

[0050] Table 1

[0051]

[0052] It is evident that the weld penetration of the welded part 105 meets the above requirements for the cover plate assembly, ensuring that the weld strength of the welded part 105 is greater than the elasticity of the sealing ring 400. This effectively achieves the aforementioned functions and effects, realizing that on the basis of the detachable assembly of the explosion-proof valve 300, not only is the assembly method easy to process, but the explosion-proof valve 300 also has sufficient structural stability in the assembled state.

[0053] In some optional embodiments, the inner edge of the welding ring 200 is provided with a notch 202 that is recessed inward along the radial direction of the welding ring 200; the outer edge of the pressure ring 500 is provided with a stop body 501 that extends outward along the radial direction of the pressure ring 500; when the stop body 501 and the notch 202 are directly opposite each other in the first direction, the pressure ring 500 is located in the first position, and the stop body 501 can pass through the notch 202 in the first direction, that is, on the projection plane perpendicular to the first direction, the orthogonal projection edge of the stop body 501 is located within the orthogonal projection edge of the notch 202, so that the pressure ring 500 can pass through the welding ring 200; when the stop body 501 and the notch 202 are misaligned, the pressure ring 500 is located in the second position, and the welding ring 200 forms a stop on the pressure ring 500, so that the pressure ring 500 is engaged in the assembly space 201 and pressed on the sealing ring 400 and the top cover plate 100. The welding ring 200 has multiple notches 202 arranged in a circumferential pattern, and correspondingly, the pressure ring 500 also has multiple stops 501 arranged in a circumferential pattern.

[0054] With this configuration, the pressure ring 500 is adjusted so that the stop body 501 aligns with the notch 202 on the welding ring 200. The pressure ring 500 then smoothly enters the assembly space 201 between the welding ring 200 and the top cover plate 100. The pressure ring 500 is then rotated to engage between the welding ring 200 and the top cover plate 100, thus completing the assembly of the explosion-proof valve 300. If the explosion-proof valve 300 breaks unexpectedly and needs to be replaced, the position of the pressure ring 500 in the circumferential direction is adjusted, i.e., the pressure ring 500 is rotated until the stop body 501 aligns with the notch 202. The pressure ring 500 can then be removed, and the sealing ring 400 and the explosion-proof valve 300 can also be easily removed, enabling convenient replacement of the explosion-proof valve 300.

[0055] Of course, in addition to the above methods, it is also feasible to have a stop body 501 on the inner edge of the welding ring 200 and a notch 202 on the outer edge of the pressure ring 500.

[0056] In some preferred embodiments, the pressure ring 500 is provided with a tooling hole 502 for insertion with a tooling. The tooling hole 502 is opened on the outer side of the pressure ring 500. The tooling hole 502 allows relevant tooling in the battery production line to be matched and inserted, so that the pressure ring 500 can rotate under the drive of the tooling.

[0057] Preferably, the tooling holes 502 are multiple and distributed in a ring array.

[0058] With this configuration, the tooling hole 502 is adapted to a specific tooling in the production line. The tooling can be inserted into the tooling hole 502 along the first direction. The rotation of the tooling drives the pressure ring 500 to rotate around its own axis, thereby realizing that the stop body 501 on the pressure ring 500 is aligned with or offset from the notch 202 on the welding ring 200, which facilitates assembly and disassembly.

[0059] Of course, in addition to the above methods, since the pressure ring 500 is ring-shaped, it is also feasible to use a tool that can be locked on the inner wall of the pressure ring 500 to drive the pressure ring 500 to rotate.

[0060] In some other specific embodiments, the inner wall of the explosion-proof hole 101 is provided with a first limiting step 102 and a second limiting step 103 distributed along a first direction, and the second limiting step 103 is close to the assembly space 201; the sealing ring 400 is pressed on the first limiting step 102, and the explosion-proof valve 300 is partially pressed on the second limiting step 103 and partially pressed on the sealing ring 400.

[0061] With this configuration, the second limiting step 103 serves as a limiting design for the explosion-proof valve 300. The second limiting step 103 provides a precise assembly position for the explosion-proof valve 300. The explosion-proof valve 300 partially overlaps the second limiting step 103, which can provide sufficient rigid support for the outer edge of the explosion-proof valve 300, which is conducive to the balanced force on the explosion-proof valve 300, thereby helping to further optimize the assembly stability of the explosion-proof valve 300.

[0062] In some other specific embodiments, the welding ring 200 includes a first ring portion 210, a second ring portion 220, and a third ring portion 230. The first ring portion 210 has a certain width in the radial direction and fits against the outer surface of the top cover plate 100. The third ring portion 230 is away from the top cover plate 100 relative to the first ring portion 210. The third ring portion 230 has a certain width in the radial direction and is at least partially pressed onto the pressure ring 500. The third ring portion 230 is located inside the first ring portion 210. The second ring portion 220 is transitionally connected between the first ring portion 210 and the third ring portion 230. The outer edge of the first ring portion 210 is welded to the inner edge of the convex ring 104. It can be said that the second ring portion 220 and the third ring portion 230 enclose an assembly space 201 with the top cover plate 100, and the inner edge of the first ring portion 210 is provided with a notch 202.

[0063] For example, please refer to Figure 7 and Figure 8 In the cross-section of the welding ring 200, the first ring portion 210 and the third ring portion 230 are rectangular, and the second ring portion 220 is composed of multiple arc surfaces.

[0064] With this design, the welded ring 200 has better structural strength and no stress concentration, making it less prone to cracks and fissures. It also provides a stable and reliable limit for the pressure ring 500, further optimizing and improving the structural stability of the detachable explosion-proof valve 300 in the assembled state.

[0065] In some other specific embodiments, the thickness of the sealing ring 400 in its natural state is amm, that is, the initial thickness of the sealing ring 400 is amm, amm is also a millimeter, and the thickness of the sealing ring 400 after being compressed in the explosion-proof hole 101 is bmm, bmm is also b millimeter, (ab) / a is the compression amount of the sealing ring 400, where 0.25≤(ab) / a≤0.6.

[0066] Through testing and verification, it was found that when the compression of the sealing ring 400 is less than 0.25, the airtightness test at the assembly point of the explosion-proof valve 300 fails, and the explosion-proof valve 300 cannot be opened normally. When the compression of the sealing ring 400 is greater than 0.6, the sealing ring 400 has poor aging resistance, is prone to collapse, and may even experience poor airtightness. When the compression of the sealing ring 400 meets the above range, the sealing performance at the assembly point of the explosion-proof valve 300 is good, the explosion-proof valve 300 can be opened normally, and the sealing ring 400 has good aging resistance.

[0067] In addition, the test process was recorded in this application, forming a performance comparison of six embodiments and four comparative examples at the assembly point of the explosion-proof valve 300, as detailed in Table 2. The following embodiments and comparative examples further illustrate the content disclosed in this application. These embodiments are only for illustrative purposes, as various modifications and changes within the scope of the disclosure of this application will be obvious to those skilled in the art.

[0068] Table 2

[0069]

[0070] It is evident that when the compression of the sealing ring 400 is within the above range, it can effectively achieve the aforementioned functions and effects, which is beneficial to the continuous sealing of the assembly of the explosion-proof valve 300.

[0071] In some other specific embodiments, on a plane perpendicular to the first direction, the width of the crimping area between the sealing ring 400 and the explosion-proof valve 300 is cmm, or the radial width of the sealing ring 400 after being compressed in the explosion-proof hole 101 is cmm, where cmm is equivalent to c millimeters and c≥0.5.

[0072] Through testing and verification, it was found that when the width of the crimping area between the sealing ring 400 and the explosion-proof valve 300 is less than 0.5mm, the airtightness of the assembly of the explosion-proof valve 300 is poor; when the width of the crimping area between the sealing ring 400 and the explosion-proof valve 300 is at least 0.5mm, the airtightness of the assembly of the explosion-proof valve 300 can be guaranteed.

[0073] In some other specific embodiments, e ≥ 0.5. With this setting, testing and verification revealed that when the weld penetration of the welded part 105 is less than 0.5 mm, the weld strength between the welded ring 200 and the convex ring 104 is insufficient, resulting in insufficient structural stability of the welded ring 200. This also affects the compression of the sealing ring 400, i.e., insufficient sealing, leading to assembly problems with the explosion-proof valve 300. Conversely, when the weld penetration of the welded part 105 is at least 0.5 mm, the weld strength between the welded ring 200 and the convex ring 104 is sufficient, the structural stability of the welded ring 200 is sufficient, and the sealing performance of the sealing ring 400 is sufficient, which is beneficial to the assembly stability and sealing performance of the explosion-proof valve 300.

[0074] In some other specific embodiments, the thickness of the welding ring 200 in the first direction is f mm, i.e., f millimeters, f ≥ 0.7. With this setting, tests and verifications have shown that when the thickness of the welding ring 200 is at least 0.7 mm, it has sufficient structural strength to resist the reaction force of the pressure ring 500, preventing the pressure ring 500 from detaching due to deformation of the welding ring 200.

[0075] In some other specific embodiments, the width of the crimping area between the pressure ring 500 and the welding ring 200 on a plane perpendicular to the first direction is d mm, i.e., d millimeters, d ≥ 0.5. With this setting, testing and verification revealed that when the width of the crimping area between the pressure ring 500 and the welding ring 200 is less than 0.5 mm, the limiting ability of the welding ring 200 on the pressure ring 500 is insufficient, easily leading to deformation of the inner edge of the welding ring 200 and the problem of the pressure ring 500 accidentally detaching. When the width of the crimping area between the pressure ring 500 and the welding ring 200 is at least 0.5 mm, the contact range between the welding ring 200 and the pressure ring 500 is sufficient, the welding ring 200 can fully exert its limiting ability on the pressure ring 500, and the overall structural stability of the assembly of the explosion-proof valve 300 is better.

[0076] Based on the aforementioned cover plate assembly, this application embodiment also provides a battery cell, which includes a housing, an electrode assembly, and the aforementioned cover plate assembly. The electrode assembly is located within the housing, and the cover plate assembly is connected to the opening of the housing. Additionally, the cover plate assembly also includes electrode terminals 600 disposed on a top cover plate 100. Since this battery cell has the aforementioned cover plate assembly, the beneficial effects brought by the cover plate assembly are described above and will not be repeated here.

[0077] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0078] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0079] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0080] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0081] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0082] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A cover plate assembly, characterized in that, include: The top cover plate has an explosion-proof hole that extends through a first direction. The top cover plate has a protruding ring that protrudes around the explosion-proof hole and along the first direction. The first direction is the thickness direction of the top cover plate. The outer edge of the welding ring is welded to the inner edge of the convex ring to form a welding part, and an assembly space communicating with the explosion-proof hole is formed between the welding ring and the top cover plate. A pressure ring is movably disposed in the assembly space. When the pressure ring rotates relative to the welding ring to a first position, the welding ring limits the pressure ring in the assembly space. When the pressure ring rotates relative to the welding ring to a second position, the pressure ring can pass through the welding ring along the first direction. An explosion-proof valve and a sealing ring are pressed and sealed in the explosion-proof hole by the pressure ring, and both the explosion-proof valve and the sealing ring can pass through the welding ring along the first direction; Wherein, on a plane perpendicular to the first direction, the width of the pressing area between the sealing ring and the explosion-proof valve is c mm, and the width of the pressing area between the pressure ring and the welding ring is d mm, where c ≥ 0.5 and d ≥ 0.5; the thickness of the welding ring in the first direction is f mm, where f ≥ 0.7; the thickness of the sealing ring in its natural state is a mm, and the thickness of the sealing ring after compression in the explosion-proof hole is b mm, where 0.25 ≤ (ab) / a ≤ 0.6; the area of ​​the pressing area between the sealing ring and the explosion-proof valve is S mm. 2 The yield strength of the material of the welded part is δMPa, the perimeter of the welded part is Dmm, and the weld penetration depth of the welded part in the first direction is emm, where e≥0.

5. .

2. The cover plate assembly according to claim 1, characterized in that, The inner edge of the welding ring is provided with a notch that is recessed inward along the radial direction of the welding ring; The outer edge of the pressure ring is provided with a stop extending radially outward along the pressure ring; When the stop body and the notch are directly opposite each other along the first direction, the pressure ring is located in the first position, and the stop body can pass through the notch along the first direction so that the pressure ring can pass through the welding ring; when the stop body and the notch are misaligned, the pressure ring is located in the second position, and the welding ring forms a stop on the pressure ring.

3. The cover plate assembly according to claim 1, characterized in that, The pressure ring is provided with a tooling hole for insertion into a tooling fixture, so that the pressure ring can rotate under the drive of the tooling fixture.

4. The cover plate assembly according to claim 1, characterized in that, The inner wall of the explosion-proof hole is provided with a first limiting step and a second limiting step distributed along the first direction, and the second limiting step is close to the assembly space. The sealing ring is pressed onto the first limiting step, and the explosion-proof valve is partially pressed onto the second limiting step and partially pressed onto the sealing ring.

5. The cover plate assembly according to claim 1, characterized in that, The welding ring includes a first ring portion, a second ring portion, and a third ring portion. The first ring portion is in contact with the outer surface of the top cover plate. The third ring portion is away from the top cover plate relative to the first ring portion, and the third ring portion is at least partially pressed onto the pressure ring. The second ring portion is transitionally connected between the first ring portion and the third ring portion. The outer edge of the first ring is welded to the inner edge of the convex ring.

6. A battery cell, characterized in that, Includes the cover plate assembly as described in any one of claims 1-5.

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