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 distributed 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 bonded to 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. The cover plate assembly provided by the application seals the liquid injection hole by arranging the sealing element in the mounting groove of the cover, bonding the sealing element to the bottom surface of the mounting groove and covering the liquid injection hole arranged on the bottom surface of the mounting groove. The cover plate assembly seals the liquid injection hole by arranging at least part of the limiting plate in the mounting groove of the cover. The structure is relatively simple, the cost is lower, the cost of the cover plate assembly is reduced, and the cost of the battery is reduced.

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, to achieve a good seal for the injection hole, the sealing structure is often complexly designed and costly. Utility Model Content

[0003] Embodiments of this application provide a cover plate assembly and a battery, which can improve the technical problem of high cost of sealing structure for sealing liquid injection holes in the cover plate assembly.

[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 is bonded to 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, and the limiting plate is located on the side of the seal opposite to the injection hole.

[0008] In some embodiments, in the thickness direction of the cap, the orthographic projection of the seal covers the orthographic projection of the injection hole, so that after the seal is bonded to the bottom surface of the mounting groove, the seal can completely cover the injection hole to effectively seal the injection hole.

[0009] In some embodiments, the seal includes a sealing layer and an adhesive layer stacked along the thickness direction of the cap. The adhesive layer surrounds the injection hole, and the side of the adhesive layer opposite to the sealing layer is bonded to the bottom surface of the mounting groove. The sealing layer covers the injection hole. Thus, the seal can bond to the bottom surface of the mounting groove near the edge of the injection hole via the adhesive layer, allowing the sealing layer to better seal the injection hole. Furthermore, the bond between the seal and the bottom surface of the mounting groove is more stable, which improves the sealing stability of the seal for the injection hole.

[0010] In some embodiments, in the thickness direction of the cap, the thickness of the sealing layer is greater than or equal to 0.02 mm and less than or equal to 1 mm, so that the sealing layer has high strength, thereby making the sealing effect of the seal on the injection hole more stable; and / or,

[0011] In the thickness direction of the cap, the thickness of the adhesive layer is greater than or equal to 0.02 mm and less than or equal to 0.5 mm, so that the adhesive layer has high adhesion, which is beneficial to improving the bonding strength between the adhesive layer and the sealing layer and the bottom surface of the mounting groove.

[0012] In some embodiments, the sealing layer is circular; the radial cross-sectional shape of the injection hole is circular; and the outer diameter of the sealing layer is larger than the inner diameter of the injection hole. Therefore, when the sealing layer is aligned with the injection hole, the adhesive layer of the sealant is bonded to the bottom surface of the mounting groove, allowing the sealing layer to completely cover the injection hole and effectively seal it.

[0013] 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 and the seal stable, which helps the limiting plate stably protect the seal.

[0014] In some embodiments, in the thickness direction of the cap, the thickness of the seal is less than or equal to the height of the support step. This prevents the seal from protruding beyond the support step and being squeezed by the limiting plate, thus affecting the sealing effect of the seal on the injection hole. Simultaneously, it also prevents the seal from pressing against the limiting plate, which could prevent the limiting plate from being installed correctly.

[0015] In some embodiments, the seal and the limiting plate are spaced apart. This prevents the seal from protruding beyond the support step and being squeezed by the limiting plate, thus affecting the sealing effect of the seal on the injection hole. It also prevents the seal from pressing against the limiting plate, which could prevent the limiting plate from being properly installed.

[0016] In some embodiments, the edge of the limiting plate is welded to the cover; the side of the limiting plate opposite to the sealing element is provided with an annular groove, which extends circumferentially along the limiting plate. Therefore, after the limiting plate and the cover are welded, the annular groove reduces the internal stress of the limiting plate, lowers the risk of welding quality problems such as cracks at the weld joint, and improves the welding stability of the limiting plate and the cover.

[0017] Secondly, embodiments of this application provide a battery including the cover assembly described above, the cover assembly comprising:

[0018] 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.

[0019] A sealing element is disposed in the mounting groove, one side of which is bonded to the bottom surface of the mounting groove and covers the injection hole;

[0020] A limiting plate is at least partially installed in the mounting groove, and the limiting plate is located on the side of the seal opposite to the injection hole.

[0021] The beneficial effects of the embodiments of this application are as follows:

[0022] The cover assembly provided in this application achieves sealing of the injection hole by placing the sealing element within the mounting groove of the cover, bonding the sealing element to the bottom surface of the mounting groove, and covering the injection hole opened on the bottom surface of the mounting groove. Simultaneously, by installing at least a portion of the limiting plate within the mounting groove of the cover, positioning the limiting plate on the side of the sealing element away from the injection hole, the sealing element can be limited and protected, enabling a more stable seal of the injection hole.

[0023] Because the structure of the seal and the limiting plate is relatively simple, and the seal is easy to attach, the sealing structure for sealing the injection hole can be simplified, making the sealing cost of the injection hole lower, which helps to reduce the cost of the cover plate assembly, and thus reduce the cost of the battery. Attached Figure Description

[0024] 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.

[0025] Figure 1 A schematic diagram of the structure of one embodiment of the battery provided in this application;

[0026] Figure 2 A cross-sectional view of one embodiment of the cover plate assembly provided in this application;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] 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.

[0029] Figure 5 A schematic diagram of the structure of one embodiment of the sealing element provided in this application;

[0030] Figure 6 This is a schematic diagram of the structure of one embodiment of the limiting plate provided in this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 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; 24-Seal; 241-Sealing layer; 242-Adhesive layer; 25-Limiting plate; 251-Panel surface; 253-Weld; 255-Annular groove; 30-Casing; Z-Thickness direction. Detailed Implementation

[0033] 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.

[0034] This application provides a cover plate assembly and a battery. These will be described in detail below.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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 includes a cap 23, a sealing element 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 sealing element 24 is disposed in the installation groove 233, and one side of the sealing element 24 is bonded to 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 sealing element 24 opposite to the injection hole 234.

[0039] The cover plate assembly 20 provided in this application embodiment achieves sealing of the injection hole 234 by placing the sealing member 24 in the mounting groove 233 of the cover 23, bonding the sealing member 24 to the bottom surface 2333 of the mounting groove 233, and covering the injection hole 234 opened in the bottom surface 2333 of the mounting groove 233. Simultaneously, by installing at least a portion of the limiting plate 25 in the mounting groove 233 of the cover 23, positioning the limiting plate 25 on the side of the sealing member 24 away from the injection hole 234, the sealing member 24 can be limited and protected, enabling the sealing member 24 to more stably seal the injection hole 234.

[0040] Since the structure of the seal 24 and the limiting plate 25 is relatively simple, and the seal 24 is easy to attach, the sealing structure for sealing the injection hole 234 can be simplified, making the sealing cost of the injection hole 234 lower, which helps to reduce the cost of the cover plate assembly 20, and thus reduce the cost of the battery 1.

[0041] In some embodiments, in the thickness direction Z of the cap 23, the orthographic projection of the sealing member 24 can cover the orthographic projection of the injection hole 234, so that after the sealing member 24 is bonded to the bottom surface 2333 of the mounting groove 233, the sealing member 24 can completely cover the injection hole 234, so as to effectively seal the injection hole 234.

[0042] Specifically, the orthographic projection of the injection hole 234 in the thickness direction Z of the cap 23 is located within the orthographic projection of the seal 24 in the thickness direction Z of the cap 23. Furthermore, the edge of the orthographic projection of the injection hole 234 in the thickness direction Z of the cap 23 is spaced from the edge of the orthographic projection of the seal 24 in the thickness direction Z of the cap 23. This allows the seal 24 to have a larger area to bond with the bottom surface 2333 of the mounting groove 233, resulting in a higher bonding strength between the seal 24 and the bottom surface 2333 of the mounting groove 233.

[0043] In some embodiments, such as Figure 3 and Figure 5 As shown, the seal 24 can include a sealing layer 241 and an adhesive layer 242 stacked along the thickness direction Z of the cap 23. The adhesive layer 242 surrounds the injection hole 234, and the side of the adhesive layer 242 facing away from the sealing layer 241 is bonded to the bottom surface 2333 of the mounting groove 233. The sealing layer 241 covers the injection hole 234. Thus, the seal 24 can bond to the bottom surface 2333 of the mounting groove 233 near the edge of the injection hole 234 through the adhesive layer 242, allowing the sealing layer 241 to better seal the injection hole 234. Furthermore, the bond between the seal 24 and the bottom surface 2333 of the mounting groove 233 is more stable, which helps improve the sealing stability of the seal 24 over the injection hole 234.

[0044] The sealing layer 241 can be made of high-strength materials such as polycarbonate (PC) or polyethylene terephthalate (PET), which helps to improve the strength of the sealing layer 241 and enable it to seal the injection hole 234 more stably. The adhesive layer 242 can be made of silicone or fluororubber to ensure good adhesion between the adhesive layer 242 and the bottom surface 2333 of the mounting groove 233, thereby improving the sealing stability of the seal 24 for the injection hole 234.

[0045] In some embodiments, the thickness of the sealing layer 241 in the thickness direction Z of the cap 23 can be greater than or equal to 0.02 mm and less than or equal to 1 mm, so that the sealing layer 241 has higher strength, thereby making the sealing effect of the sealing member 24 on the injection hole 234 more stable. The thickness of the sealing layer 241 in the thickness direction Z of the cap 23 can be 0.04 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.3 mm, 0.5 mm, 0.8 mm, 0.9 mm, etc., depending on the material of the sealing layer 241, and is not limited here.

[0046] Furthermore, in the thickness direction Z of the cap 23, the thickness of the adhesive layer 242 can be greater than or equal to 0.02 mm and less than or equal to 0.5 mm, so that the adhesive layer 242 has high adhesion, which is beneficial to improving the bonding strength between the adhesive layer 242 and the sealing layer 241 and the bottom surface 2333 of the mounting groove 233. The thickness of the adhesive layer 242 in the thickness direction Z of the cap 23 can be 0.04 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.3 mm, 0.4 mm, etc., depending on the material of the adhesive layer 242, and is not limited here.

[0047] In some embodiments, the outer diameter of the sealing layer 241 can be greater than or equal to 3 mm and less than or equal to 6 mm, so that the sealing layer 241 has a large size and can completely cover the injection hole 234. The outer diameter of the sealing layer 241 can be 3.2 mm, 3.5 mm, 3.8 mm, 4 mm, 4.5 mm, 5.2 mm, 5.8 mm, etc., depending on the inner diameter of the injection hole 234.

[0048] In some embodiments, the adhesive layer 242 can be an annular structure. The inner diameter of the adhesive layer 242 is greater than or equal to 1.5 mm and less than or equal to 5 mm, giving it a large size. When the adhesive layer 242 is bonded to the bottom surface 2333 of the mounting groove 233, it can surround the injection hole 234, allowing the sealing layer 241 to completely cover the injection hole 234. The inner diameter of the adhesive layer 242 can be 1.7 mm, 2 mm, 2.2 mm, 2.7 mm, 3 mm, 3.5 mm, 4.6 mm, etc., specifically determined according to the inner diameter of the injection hole 234.

[0049] In some embodiments, the thickness of the seal 24 in the thickness direction Z of the cap 23 can be greater than or equal to 0.5 mm and less than or equal to 2 mm, so that the seal 24 has sufficient strength to effectively seal the injection hole 234. The thickness of the seal 24 in the thickness direction Z of the cap 23 can be 0.6 mm, 0.8 mm, 1.1 mm, 1.5 mm, 1.8 mm, etc., depending on the material of the seal 24.

[0050] In some embodiments, the sealing layer 241 of the sealant 24 can be circular. The radial cross-sectional shape of the injection hole 234 is circular. The outer diameter of the sealing layer 241 is larger than the inner diameter of the injection hole 234. Thus, when the sealing layer 241 is aligned with the injection hole 234, the adhesive layer 242 of the sealant 24 is bonded to the bottom surface 2333 of the mounting groove 233, so that the sealing layer 241 completely covers the injection hole 234, thereby effectively sealing the injection hole 234.

[0051] Specifically, the sealing layer 241 is substantially coaxial with the injection hole 234. The adhesive layer 242 is disposed around the injection hole 234. The adhesive layer 242 extends from the edge of the sealing layer 241 toward the edge of the injection hole 234.

[0052] Of course, the radial cross-sectional shape of the injection hole 234 and the shape of the sealing layer 241 can also be elliptical, square or other shapes, as long as the adhesive layer 242 of the sealing member 24 is bonded to the bottom surface 2333 of the mounting groove 233, the sealing layer 241 can completely cover the injection hole 234.

[0053] In some embodiments, the bottom surface 2333 of the mounting groove 233 has a protruding support step 2334 surrounding the seal 24, 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, keeping the position of the limiting plate 25 relative to the cover 23 and the seal 24 stable, which helps the limiting plate 25 to stably protect the seal 24.

[0054] The supporting step 2334 extends circumferentially along the injection hole 234. The supporting step 2334 has a ring 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. The sealing element 24 is located within the first groove segment 2331.

[0055] The limiting plate 25 is located within the second groove section 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. 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.

[0056] In some embodiments, the thickness of the sealing element 24 in the thickness direction Z of the cap 23 can be less than or equal to the height of the supporting step 2334. This prevents the sealing element 24 from protruding beyond the supporting step 2334 and being squeezed by the limiting plate 25, thus affecting the sealing effect of the sealing element 24 on the injection hole 234. Simultaneously, it also prevents the sealing element 24 from pressing against the limiting plate 25, thus preventing the limiting plate 25 from being unable to be installed properly.

[0057] In some embodiments, the seal 24 and the limiting plate 25 can be spaced apart. This prevents the limiting plate 25 from squeezing the seal 24 and affecting the sealing effect of the seal 24 on the injection hole 234. At the same time, it also prevents the seal 24 from pressing against the limiting plate 25, which would prevent the limiting plate 25 from being installed in place.

[0058] 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 0.5 mm, so that the height of the support step 2334 in the thickness direction Z of the cover 23 is greater than or equal to 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 will not exert a large compressive force on the seal 24.

[0059] The height of the support step 2334 in the thickness direction Z of the cover 23 can be 0.25mm, 0.3mm, 0.4mm, 0.45mm, etc., depending on the thickness of the seal 24 in the thickness direction Z of the cover 23.

[0060] 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 3 mm and less than or equal to 8 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.

[0061] The inner diameter of the first groove 2331 can be 3.6mm, 3.8mm, 4mm, 4.5mm, 5mm, 6.7mm, 7.2mm, 7.5mm, etc., depending on the size of the seal 24.

[0062] In some embodiments, the inner diameter of the injection hole 234 can be greater than 1.5 mm and less than or equal to 5 mm, so that the inner diameter of the injection hole 234 is small enough to be accurately covered by the seal 24. The inner diameter of the injection hole 234 can be 1.6 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 3.7 mm, 4.2 mm, 4.5 mm, etc., depending on the size of the seal 24.

[0063] 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.

[0064] Specifically, 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. The thickness direction Z of the limiting plate 25 is substantially the same as that 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. The weld 253 also ensures that the edge of the limiting plate 25 and the edge of the mounting groove 233 remain sealed, which is beneficial for further improving the sealing effect on the injection hole 234.

[0065] like Figure 6 As shown, an annular groove 255 is provided on the side of the limiting plate 25 facing away from the seal 24. The annular groove 255 extends circumferentially along the limiting plate 25. Therefore, after the limiting plate 25 is welded to the cover 23, the annular groove 255 can reduce the internal stress of the limiting plate 25, reduce welding quality 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.

[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 1As 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 is bonded to the bottom surface of the mounting groove and covers the injection hole; A limiting plate is at least partially installed in the mounting groove, and the limiting plate is located on the side of the seal opposite to the injection hole.

2. The cover plate assembly as claimed in claim 1, characterized in that, In the thickness direction of the cap, the orthographic projection of the seal overlaps the orthographic projection of the injection hole.

3. The cover plate assembly as claimed in claim 2, characterized in that, The sealing element includes a sealing layer and an adhesive layer stacked along the thickness direction of the cap. The adhesive layer surrounds the injection hole, and the side of the adhesive layer opposite to the sealing layer is bonded to the bottom surface of the mounting groove. The sealing layer covers the injection hole.

4. The cover plate assembly as claimed in claim 3, characterized in that, In the thickness direction of the cap, the thickness of the sealing layer is greater than or equal to 0.02 mm and less than or equal to 1 mm; and / or, In the thickness direction of the cap, the thickness of the adhesive layer is greater than or equal to 0.02 mm and less than or equal to 0.5 mm.

5. The cover plate assembly as claimed in claim 3, characterized in that, The sealing layer is circular; the radial cross-sectional shape of the injection hole is circular; the outer diameter of the sealing layer is larger than the inner diameter of the injection hole.

6. The cover plate assembly as claimed in any one of claims 1 to 5, 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.

7. The cover plate assembly as claimed in claim 6, characterized in that, In the thickness direction of the cap, the thickness of the seal is less than or equal to the height of the support step.

8. The cover plate assembly as claimed in any one of claims 1 to 5, characterized in that, The sealing element is spaced apart from the limiting plate.

9. The cover plate assembly as claimed in any one of claims 1 to 5, characterized in that, The edge of the limiting plate is welded to the cover; the side of the limiting plate opposite to the sealing element is provided with an annular groove, which extends circumferentially along the limiting plate.

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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