Cover plate assembly and battery

Abstract

The application provides a cover plate assembly and a battery. The cover plate assembly comprises a cover, a sealing element and a limiting plate. The cover comprises a top side and a bottom side along the thickness direction of the cover. The top side of the cover is provided with a mounting groove. The bottom surface of the mounting groove is provided with a through liquid injection hole. The sealing element is arranged in the mounting groove. One side of the sealing element is in abutment with the bottom surface of the mounting groove and covers the liquid injection hole. The limiting plate is at least partially arranged in the mounting groove. The limiting plate is located on the side of the sealing element away from the liquid injection hole. One side of the limiting plate is in abutment with the other side of the sealing element, so that the limiting plate and the bottom surface compress the sealing element. The cover plate assembly provided by the application can effectively seal the liquid injection hole by covering the liquid injection hole with the sealing element, tightly abutting the bottom surface of the mounting groove with the sealing element, and stably keeping the sealing element in the position covering the liquid injection hole.

Description

Technical Field

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

[0002] Battery cover assemblies typically have an injection hole on their caps. After electrolyte is injected into the battery through this hole, a sealing structure is needed to seal it and prevent electrolyte leakage. However, in related technologies, the sealing structure does not provide a good seal for the injection hole, allowing electrolyte to easily leak out. Utility Model Content

[0003] The embodiments of this application provide a cover plate assembly and a battery, which can improve the technical problem of poor sealing effect of the cover plate assembly sealing structure on the liquid injection hole on the cover.

[0004] In a first aspect, embodiments of this application provide a cover plate assembly, comprising:

[0005] A cap includes a top side and a bottom side distributed along its thickness direction. The top side of the cap has an installation groove, and the bottom surface of the installation groove has a through injection hole.

[0006] A sealing element is disposed in the mounting groove, one side of which abuts against the bottom surface of the mounting groove and covers the injection hole;

[0007] A limiting plate is at least partially installed in the mounting groove. The limiting plate is located on the side of the seal opposite to the injection hole. One side of the limiting plate abuts against the other side of the seal, so that the limiting plate and the bottom surface compress the seal.

[0008] In some embodiments, the bottom surface of the mounting groove has a supporting step that surrounds the seal, and one side of the limiting plate is supported by the supporting step. By having the supporting step support one side of the limiting plate, the limiting plate can be positioned, keeping its position relative to the cover stable. This helps to keep the compression of the sealing element by the limiting plate stable, thereby ensuring a stable sealing effect of the sealing element.

[0009] In some embodiments, in the thickness direction of the cover, the thickness of the seal is greater than the height of the support step, so that when one side of the limiting plate is supported on the support step, the one side of the limiting plate has a greater amount of compression on the seal, thus making the sealing effect of the seal better.

[0010] In some embodiments, the edge of the limiting plate is welded to the cover; the limiting plate has a groove on the side facing the seal, and a portion of the seal is accommodated in the groove. After the limiting plate and the cover are welded, the groove can reduce the internal stress of the limiting plate, reduce weld problems such as cracks at the weld between the limiting plate and the cover, and improve the welding stability of the limiting plate and the cover.

[0011] In some embodiments, the compression of the seal is greater than or equal to 10% and less than or equal to 50%. This moderate compression helps maintain a good seal against the injection hole while extending the seal's lifespan.

[0012] In some embodiments, in the thickness direction of the cover, the thickness of the seal is greater than or equal to 0.5 mm and less than or equal to 2 mm, so that the seal is thicker and has a larger compression amount when compressed by the limiting plate, so that the seal has a better sealing effect.

[0013] In some embodiments, the seal is a circular sheet structure; the radial cross-sectional shape of the injection hole is circular; and the outer diameter of the seal is larger than the inner diameter of the injection hole. When one side of the seal abuts against the bottom surface of the mounting groove, the seal can better cover the injection hole, thereby improving the sealing effect of the seal on the injection hole.

[0014] In some embodiments, the outer diameter of the seal is greater than or equal to 3 mm and less than or equal to 7 mm, so that the outer diameter of the seal has a large difference from the outer diameter of the injection hole, thereby enabling the seal to better seal the injection hole.

[0015] In some embodiments, the radial cross-sectional shape of the limiting plate is circular; the maximum outer diameter of the limiting plate is greater than or equal to 5 mm and less than or equal to 10 mm, which enables the limiting plate to have a large outer diameter. When the edge of the limiting plate is welded to the cover, the edge of the limiting plate has sufficient welding space, which is beneficial to improving the welding quality between the limiting plate and the cover.

[0016] Secondly, embodiments of this application provide a battery including a cover assembly as described above, the cover assembly comprising:

[0017] A cap includes a top side and a bottom side distributed along its thickness direction. The top side of the cap has an installation groove, and the bottom surface of the installation groove has a through injection hole.

[0018] A sealing element is disposed in the mounting groove, one side of which abuts against the bottom surface of the mounting groove and covers the injection hole;

[0019] A limiting plate is at least partially installed in the mounting groove. The limiting plate is located on the side of the seal opposite to the injection hole. One side of the limiting plate abuts against the other side of the seal, so that the limiting plate and the bottom surface compress the seal.

[0020] The beneficial effects of the embodiments of this application are as follows:

[0021] The cover assembly provided in this application provides an installation groove on the top side of the cover and a through injection hole on the bottom surface of the installation groove. A sealing element is placed in the installation groove, with one side of the sealing element abutting against the bottom surface of the installation groove and covering the injection hole. At the same time, at least a portion of a limiting plate is installed in the installation groove, with one side of the limiting plate abutting against the other side of the sealing element. The limiting plate and the bottom surface of the installation groove compress the sealing element, enabling the sealing element to fit tightly against the bottom surface of the installation groove and stably maintain the sealing element in the position covering the injection hole, thereby achieving effective sealing of the injection hole. Attached Figure Description

[0022] 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.

[0023] Figure 1 A schematic diagram of the structure of one embodiment of the battery provided in this application;

[0024] Figure 2 A cross-sectional view of one embodiment of the cover plate assembly provided in this application;

[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This is a schematic diagram of the structure after the limiting plate and the cover are welded together, as provided in an embodiment of this application.

[0027] Figure 5 A schematic diagram of the structure of one embodiment of the sealing element provided in this application;

[0028] Figure 6 A partially enlarged cross-sectional view of another embodiment of the cover plate assembly provided in this application;

[0029] Figure 7 A schematic diagram of another embodiment of the seal provided in this application;

[0030] Figure 8A partially enlarged cross-sectional view of yet another embodiment of the cover plate assembly provided in this application;

[0031] Figure 9 This is a schematic diagram of another embodiment of the sealing element provided in this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Battery; 10-Casing; 20-Cover assembly; 21-Positive terminal; 22-Negative terminal; 23-Cap; 231-Top side; 232-Bottom side; 233-Mounting groove; 2331-First groove segment; 2332-Second groove segment; 2333-Bottom surface; 2334-Support step; 2335-Step surface; 234-Injection hole; 235-Annular positioning groove; 24-Seal; 25-Limiting plate; 251-Plate surface; 252-Abutting surface; 253-Weld; 254-Protrusion; 30-Casing; Z-Thickness direction. Detailed Implementation

[0034] 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.

[0035] This application provides a cover plate assembly and a battery. These will be described in detail below.

[0036] Figure 1 This is a schematic diagram of the structure of one embodiment of the battery provided in this application. Figure 1 As shown, battery 1 includes a casing 10 and a core pack (not shown in the figure). The casing 10 includes a cover assembly 20 and a housing 30, which are connected and enclose a cavity (not shown in the figure), within which the core pack is disposed. The cover assembly 20 has a positive terminal 21 and a negative terminal 22, with the positive terminal 21 connected to the positive tab of the core pack and the negative terminal 22 connected to the negative tab of the core pack.

[0037] The cover assembly 20 is also provided with an injection hole 234, which is used to inject electrolyte into the cavity of the housing 10. After the electrolyte injection is completed, the injection hole 234 is sealed by a sealing structure to prevent electrolyte in the cavity of the housing 10 from leaking out of the injection hole 234.

[0038] Continue to refer to Figure 1 The cover assembly 20 may include a cap 23, which is connected to the housing 30 and encloses a cavity. A positive electrode post 21 passes through the cap 23 and connects to the positive tab of the core package within the cavity. The positive electrode post 21 and the cap 23 are insulated from each other by an insulating element and remain sealed. A negative electrode post 22 passes through the cap 23 and connects to the negative tab of the core package within the cavity. The negative electrode post 22 and the cap 23 are insulated from each other by an insulating element and remain sealed. An injection port 234 is located between the positive electrode post 21 and the negative electrode post 22 and extends through the cap 23.

[0039] Figure 2 A cross-sectional view of one embodiment of the cover plate assembly provided in this application. Figure 3 for Figure 2 A magnified view of point A in the middle. (See image below.) Figure 2 and Figure 3 As shown, the cover assembly 20 may include a cap 23, a seal 24, and a limiting plate 25. The cap 23 includes a top side 231 and a bottom side 232 distributed along its thickness direction Z. The top side 231 of the cap 23 has an installation groove 233, and the bottom surface 2333 of the installation groove 233 has a through injection hole 234. The seal 24 is disposed in the installation groove 233, and one side of the seal 24 abuts against the bottom surface 2333 of the installation groove 233, covering the injection hole 234. The limiting plate 25 is at least partially installed in the installation groove 233, and the limiting plate 25 is located on the side of the seal 24 opposite to the injection hole 234. One side surface 251 of the limiting plate 25 abuts against the other side of the seal 24, so that the limiting plate 25 and the bottom surface 2333 compress the seal 24.

[0040] The cover plate assembly 20 provided in this application embodiment has an installation groove 233 on the top side 231 of the cover 23 and a through injection hole 234 on the bottom surface 2333 of the installation groove 233. The sealing member 24 is placed in the installation groove 233, so that one side of the sealing member 24 abuts against the bottom surface 2333 of the installation groove 233 and covers the injection hole 234. At the same time, at least a portion of the limiting plate 25 is installed in the installation groove 233, so that one side surface 251 of the limiting plate 25 abuts against the other side of the sealing member 24. The limiting plate 25 and the bottom surface 2333 of the installation groove 233 compress the sealing member 24, so that the sealing member 24 is tightly fitted to the bottom surface 2333 of the installation groove 233 and the sealing member 24 is stably maintained in the position covering the injection hole 234, thereby achieving effective sealing of the injection hole 234.

[0041] In some embodiments, a support step 2334 may be provided around the seal 24 on the bottom surface 2333 of the mounting groove 233, and one side surface 251 of the limiting plate 25 is supported on the support step 2334. By having the support step 2334 support one side surface 251 of the limiting plate 25, the limiting plate 25 can be positioned, and the position of the limiting plate 25 relative to the cover 23 can be kept stable. This helps to keep the compression of the sealing member 24 by the limiting plate 25 stable, thereby keeping the sealing effect of the sealing member 24 stable.

[0042] The supporting step 2334 extends circumferentially along the injection hole 234. The supporting step 2334 has an annular structure. The mounting groove 233 includes a first groove segment 2331 and a second groove segment 2332 connected sequentially along the thickness direction Z of the cover 23. The first groove segment 2331 is located between the second groove segment 2332 and the injection hole 234. The bottom surface 2333 of the mounting groove 233 is located at the end of the first groove segment 2331 near the injection hole 234. The first groove segment 2331 is located within the supporting step 2334. The second groove segment 2332 is located on the side of the supporting step 2334 near the top side 231 of the cover 23. A portion of the sealing member 24 is located within the first groove segment 2331. At least a portion of the limiting plate 25 is located within the second groove segment 2332, and one side surface 251 of the limiting plate 25 abuts against the step surface 2335 of the supporting step 2334 near the top side 231 of the cover 23.

[0043] In some embodiments, in the thickness direction Z of the cover 23, the thickness of the seal 24 can be greater than the height of the support step 2334, so that when one side plate 251 of the limiting plate 25 is supported on the support step 2334, the one side plate 251 of the limiting plate 25 has a greater compression on the seal 24, so that the sealing effect of the seal 24 is better.

[0044] Specifically, the ratio of the thickness of the sealing element 24 in the Z-direction of the cover 23 to the height of the supporting step 2334 in the Z-direction of the cover 23 can be greater than or equal to 1.5. This ensures that when one side surface 251 of the limiting plate 25 is supported by the supporting step 2334, the compression of the sealing element 24 by one side surface 251 of the limiting plate 25 is greater. The ratio of the thickness of the sealing element 24 in the Z-direction of the cover 23 to the height of the supporting step 2334 in the Z-direction of the cover 23 can be 1.6, 1.8, 1.9, 2, 2.5, etc., and can be determined based on factors such as the size, material, and shape of the sealing element 24.

[0045] In some embodiments, the thickness of the sealing element 24 in the thickness direction Z of the cover 23 can be greater than or equal to 0.5 mm and less than or equal to 2 mm, so that the sealing element 24 is relatively thick. When the sealing element 24 is compressed by the limiting plate 25, the sealing element 24 has a large amount of compression, so that the sealing element 24 has a better sealing effect. The thickness of the sealing element 24 in the thickness direction Z of the cover 23 can be 0.6 mm, 0.8 mm, 1.1 mm, 1.5 mm, 1.8 mm, etc., and can be determined according to factors such as the size, material, and shape of the sealing element 24.

[0046] In some embodiments, the height of the support step 2334 in the thickness direction Z of the cover 23 can be greater than or equal to 0.2 mm and less than or equal to 1 mm, so that the height of the support step 2334 in the thickness direction Z of the cover 23 is less than the thickness of the seal 24 in the thickness direction Z of the cover 23. When one side plate 251 of the limiting plate 25 is supported on the support step 2334, the one side plate 251 of the limiting plate 25 has a large compressive force on the seal 24, so that the seal 24 has a large compression amount.

[0047] The height of the support step 2334 in the thickness direction Z of the cover 23 can be 0.3mm, 0.4mm, 0.7mm, 0.9mm, etc., depending on the thickness of the seal 24 in the thickness direction Z of the cover 23 and the compression requirement of the seal 24.

[0048] like Figure 3 As shown, one side surface 251 of the limiting plate 25 includes an abutment surface 252 for abutting against the seal 24. When at least a portion of the limiting plate 25 is installed in the mounting groove 233, the abutment surface 252 of the limiting plate 25 faces the bottom surface 2333 of the mounting groove 233, and the abutment surface 252 of the limiting plate 25 and the bottom surface 2333 of the mounting groove 233 together press against the seal 24.

[0049] In some embodiments, the distance between the abutment surface 252 of the limiting member and the bottom surface 2333 of the mounting groove 233 can be greater than or equal to 0.2 mm and less than or equal to 1.5 mm, so that when one side plate surface 251 of the limiting plate 25 is supported on the supporting step 2334, the abutment surface 252 of the limiting plate 25 has a large compressive force on the sealing member 24, so that the sealing member 24 has a large compression amount.

[0050] In some embodiments, such as Figure 4 As shown, the limiting plate 25 can be welded to the cover 23 to improve the connection stability between the limiting plate 25 and the cover 23, thereby improving the limiting and compression effect on the seal 24 and keeping the sealing effect of the seal 24 stable.

[0051] The edge of the limiting plate 25 can be welded to the cover 23 to further improve the connection strength between the limiting plate 25 and the cover 23. Specifically, the thickness direction Z of the limiting plate 25 is basically consistent with the thickness direction Z of the cover 23. A weld 253 is formed between the edge of the limiting plate 25 and the edge of the mounting groove 233 to weld the limiting plate 25 to the cover 23. The weld 253 extends circumferentially along the mounting groove 233 in a ring structure to further improve the welding strength between the limiting plate 25 and the cover 23, and the weld 253 can keep the edge of the limiting plate 25 and the edge of the mounting groove 233 sealed, which is beneficial to further improve the sealing effect of the injection hole 234.

[0052] In some embodiments, a groove may be provided on the plate surface 251 of the limiting plate 25 facing the sealing member 24, and a portion of the sealing member 24 may be accommodated in the groove. Thus, after the limiting plate 25 and the cover 23 are welded, the groove can reduce the internal stress of the limiting plate 25, reduce weld seam problems such as cracks at the weld between the limiting plate 25 and the cover 23, and improve the welding stability of the limiting plate 25 and the cover 23.

[0053] The contact surface 252 of the limiting plate 25 is located at the bottom of the groove. The shape of the groove can be determined according to the shape of the seal 24, so that the end of the seal 24 away from the injection hole 234 can be inserted into the groove. For example Figure 5 As shown, the seal 24 is a circular plate structure. The groove is a cylindrical groove. The inner diameter of the groove is larger than the outer diameter of the seal 24, so that the end of the seal 24 facing away from the injection hole 234 can be inserted into the groove.

[0054] In some embodiments, the inner diameter of the groove can be greater than or equal to 3 mm and less than or equal to 8 mm, so that the groove has a larger size, making it easier for the end of the seal 24 away from the injection hole 234 to be inserted into the groove. The inner diameter of the groove can be 4 mm, 4.8 mm, 5.5 mm, 6 mm, 7 mm, etc., depending on the size of the seal 24.

[0055] In some embodiments, the compression of the seal 24 can be greater than or equal to 10% and less than or equal to 50%. This allows for a moderate compression of the seal 24, which helps maintain a good seal against the injection hole 234 while extending the lifespan of the seal 24. The compression of the seal 24 can be 15%, 20%, 30%, 35%, 42%, etc., depending on the material of the seal 24 and the sealing requirements.

[0056] The compression of the seal 24 can be greater than or equal to 25% and less than or equal to 45%, so as to further improve the sealing effect of the seal 24 and give the seal 24 a longer service life.

[0057] In some embodiments, such as Figure 5 As shown, the seal 24 can be a circular sheet structure, and the radial cross-sectional shape of the injection hole 234 is circular. Moreover, the outer diameter of the seal 24 is larger than the inner diameter of the injection hole 234. Therefore, when one side of the seal 24 abuts against the bottom surface 2333 of the mounting groove 233, the seal 24 can better cover the injection hole 234, thereby improving the sealing effect of the seal 24 on the injection hole 234.

[0058] In some embodiments, the outer diameter of the seal 24 can be greater than or equal to 3 mm and less than or equal to 7 mm, so that there is a large difference between the outer diameter of the seal 24 and the outer diameter of the injection hole 234, thereby enabling the seal 24 to better seal the injection hole 234. The outer diameter of the seal 24 can be 4 mm, 5.5 mm, 6 mm, 6.4 mm, etc., depending on factors such as the material of the seal 24 and the shape and size of the injection hole 234.

[0059] In some embodiments, the radial cross-sectional shape of the first groove segment 2331 can be circular. The inner diameter of the first groove segment 2331 is greater than or equal to 2 mm and less than or equal to 7.5 mm, so that the first groove segment 2331 can accommodate the seal 24, and the inner circumferential surface of the first groove segment 2331 can play a certain limiting effect on the seal 24, so that the seal 24 is held in the position covering the injection hole 234.

[0060] In some embodiments, the radial cross-sectional shape of the limiting plate 25 can be circular. The maximum outer diameter of the limiting plate 25 is greater than or equal to 5 mm and less than or equal to 10 mm. This allows for a relatively large outer diameter of the limiting plate 25, providing sufficient welding space when the edge of the limiting plate 25 is welded to the cover 23, which is beneficial for improving the welding quality between the limiting plate 25 and the cover 23. The outer diameter of the limiting plate 25 can be 6 mm, 7 mm, 7.6 mm, 8 mm, 8.8 mm, etc., and can be specifically determined based on factors such as the shape of the limiting plate 25 and the welding process.

[0061] Specifically, the outer peripheral surface of the limiting plate 25 is a conical surface. The outer diameter of the limiting plate 25 gradually decreases in the direction from the top side 231 to the bottom side 232 of the cover 23. The inner peripheral surface of the second groove section 2332 is a conical surface adapted to the outer peripheral surface of the limiting plate 25.

[0062] In other embodiments, such as Figure 6 and Figure 7As shown, the seal 24 can be an annular structure. The limiting plate 25 has a protrusion 254 on the side facing the injection hole 234. The protrusion 254 passes through the seal 24 and is inserted into the injection hole 234. Thus, the seal 24 can be positioned by the protrusion 254, so that when the seal 24 is compressed, the radial deformation of the seal 24 is smaller. This results in a greater contact force between the seal 24 and the bottom surface 2333 of the limiting plate 25 and the mounting groove 233, which is beneficial to improving the sealing effect of the seal 24.

[0063] Specifically, the radial cross-sectional shape of the seal 24 is rectangular. The inner surface of the seal 24 is in contact with the outer peripheral surface of the protrusion 254. One side of the seal 24 is in contact with the bottom surface 2333 of the mounting groove 233. The other side of the seal 24 is in contact with one side surface 251 of the limiting plate 25.

[0064] In other embodiments, such as Figure 8 and Figure 9 As shown, the seal 24 can be an annular structure. The limiting plate 25 has a protrusion 254 on the side facing the injection hole 234, which passes through the seal 24 and inserts into the injection hole 234. An annular positioning groove 235 is formed on the bottom surface 2333 of the mounting groove 233, and the seal 24 is installed within the annular positioning groove 235. Therefore, the seal 24 can be positioned by the annular positioning groove 235, resulting in less radial deformation of the seal 24 when compressed. This increases the contact force between the seal 24 and the limiting plate 25 and the bottom surface 2333 of the mounting groove 233, thus improving the sealing effect of the seal 24.

[0065] Specifically, the radial cross-sectional shape of the seal 24 is circular. One side of the seal 24 is in contact with the bottom surface 2333 of the annular positioning groove 235. The other side of the seal 24 is in contact with one side surface 251 of the limiting plate 25.

[0066] This application also provides a battery, which includes a cover assembly. The specific structure of the cover assembly is as described in the above embodiments. Since this battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0067] Among them, such as Figure 1 As shown, battery 1 includes a casing 10 and a core pack (not shown in the figure). The casing 10 includes a cover assembly 20 and a housing 30, which are connected and enclose a cavity (not shown in the figure), within which the core pack is disposed. The structure of the cover assembly 20 can refer to the above embodiments and will not be repeated here. The structure of the core pack can be an existing structure including a core, a positive electrode tab, and a negative electrode tab, and is not limited here.

[0068] 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, include: A cap includes a top side and a bottom side distributed along its thickness direction. The top side of the cap has an installation groove, and the bottom surface of the installation groove has a through injection hole. A sealing element is disposed in the mounting groove, one side of which abuts against the bottom surface of the mounting groove and covers the injection hole; A limiting plate is at least partially installed in the mounting groove. The limiting plate is located on the side of the seal opposite to the injection hole. One side of the limiting plate abuts against the other side of the seal, so that the limiting plate and the bottom surface compress the seal.

2. The cover plate assembly as claimed in claim 1, characterized in that, The bottom surface of the mounting groove has a support step that surrounds the seal, and one side of the limiting plate is supported by the support step.

3. The cover plate assembly as claimed in claim 2, characterized in that, In the thickness direction of the cap, the thickness of the seal is greater than the height of the support step.

4. The cover plate assembly as claimed in claim 3, characterized in that, The edge of the limiting plate is welded to the cover; the plate surface of the limiting plate facing the sealing element has a groove, and a part of the sealing element is accommodated in the groove.

5. The cover plate assembly as claimed in claim 1, characterized in that, The compression of the seal is greater than or equal to 10% and less than or equal to 50%.

6. The cover plate assembly as claimed in claim 1, characterized in that, In the thickness direction of the cap, the thickness of the seal is greater than or equal to 0.5 mm and less than or equal to 2 mm.

7. The cover plate assembly as claimed in any one of claims 1 to 6, characterized in that, The sealing element is a circular sheet structure; the radial cross-sectional shape of the injection hole is circular; the outer diameter of the sealing element is larger than the inner diameter of the injection hole.

8. The cover plate assembly as claimed in claim 7, characterized in that, The outer diameter of the seal is greater than or equal to 3 mm and less than or equal to 7 mm.

9. The cover plate assembly as claimed in any one of claims 1 to 6, characterized in that, The radial cross-sectional shape of the limiting plate is circular; the maximum outer diameter of the limiting plate is greater than or equal to 5 mm and less than or equal to 10 mm.

10. A battery, characterized in that, Includes the cover plate assembly as described in any one of claims 1 to 9.

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