Cover plate assembly and battery

Abstract

The application provides a cover plate assembly and a battery. The cover plate assembly comprises a cover plate and a first sealing element. The cover plate is provided with a through hole. The outer circumferential surface of the first sealing element is provided with a groove. The first sealing element partially penetrates the through hole and embeds the cover plate partially into the groove. The first sealing element has elasticity. The bottom surface of the groove along the radial direction of the through hole abuts against the inner surface of the through hole to seal the first sealing element and the cover plate. In the application, the first sealing element penetrates the through hole of the cover plate by using its own elasticity. The part of the cover plate at the edge of the through hole is directly embedded into the groove on the first sealing element. The first sealing element is extruded by abutting against the bottom surface of the groove along the radial direction of the through hole, so that the first sealing element is deformed in the radial direction to realize the sealing cooperation between the first sealing element and the cover plate, thereby ensuring the sealing stability of the cover plate assembly.

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] In the battery manufacturing process, after battery assembly, electrolyte is injected into the casing through the injection and venting ports on the cover. Then, formation is performed. After formation, the gases generated during the formation process are extracted through the injection and venting ports, and the injection and venting ports are sealed using welding to complete battery manufacturing. However, the sealing methods used in these technologies have poor sealing stability, thus affecting the battery's lifespan. Utility Model Content

[0003] The embodiments of this application provide a cover plate assembly and a battery, which can improve the problem of poor sealing stability of the cover plate assembly.

[0004] In a first aspect, embodiments of this application provide a cover plate assembly, comprising: A cover plate, wherein the cover plate is provided with a through hole; A first sealing element has a groove on its outer peripheral surface. A portion of the first sealing element passes through the through hole, and a portion of the cover plate is embedded in the groove. The first sealing element is elastic, and the bottom surface of the groove along the radial direction of the through hole abuts against the inner surface of the through hole, so that the first sealing element and the cover plate are sealed together.

[0005] In this application, the first sealing element uses its own elasticity to pass through the through hole on the cover plate. The part of the cover plate located at the edge of the through hole is directly embedded in the groove on the first sealing element. By abutting against the bottom surface of the groove along the radial direction of the through hole, the first sealing element is squeezed, causing the first sealing element to deform in the radial direction, so as to achieve a sealing fit between the first sealing element and the cover plate, thereby ensuring the sealing stability of the cover plate assembly.

[0006] In one embodiment, the cover plate includes opposing first and second sides, the first seal includes a first sealing portion protruding from the first side and a second sealing portion protruding from the second side, and the groove is formed between the first sealing portion and the second sealing portion; wherein, The first sealing portion abuts against the first side; and / or, The second sealing part abuts against the second side.

[0007] When the cover plate assembly is applied to the battery, one of the first sealing part and the second sealing part extends into the battery and the other is located outside the battery. The portion of the cover plate located at the edge of the through hole is embedded between the first sealing part and the second sealing part. The first sealing member abuts against the first side and / or the second side of the cover plate to further improve the sealing effect between the first sealing member and the cover plate.

[0008] In one embodiment, the area where the first sealing portion abuts against the first side has a first abutment width L1 in the radial direction along the through hole, the first abutment width L1 satisfying the relationship: 0.1mm ≤ L1 ≤ 1.2mm; and / or, The area where the second sealing part abuts against the second side has a second abutment width L2 in the radial direction along the through hole, and the second abutment width L2 satisfies the relationship: 0.1mm≤L2≤1.5mm.

[0009] By setting the first abutment width L1 to 0.1mm≤L1≤1.2mm and the second abutment width L2 to 0.1mm≤L2≤1.5mm, it is possible to ensure the effective cooperation between the first seal and the cover plate while ensuring the sealing effect between the second seal and the second side.

[0010] In one embodiment, the cover assembly is for a battery, the first side facing the interior of the battery, the area where the first sealing portion abuts against the first side has a first abutment width L1 in the radial direction along the through hole, and the area where the second sealing portion abuts against the second side has a second abutment width L2 in the radial direction along the through hole, the first abutment width L1 and the second abutment width L2 satisfy the relationship: 1≤L2 / L1≤5.

[0011] By setting the first abutment width L1 and the second abutment width L2 to 1≤L2 / L1≤5, the second abutment width L2 is greater than the first abutment width L1. This ensures the sealing effect between the first seal and the cover plate while facilitating their assembly. At the same time, it also avoids excessive differences between the second abutment width L2 and the first abutment width L1, thus ensuring the structural stability of the first seal itself.

[0012] In one embodiment, the cover assembly is used for a battery, the first side facing the interior of the battery, and the cover assembly further includes a second seal disposed on a second side of the cover, the second seal covering and abutting the outer surface of the second sealing portion, and the second seal being connected to the cover. By positioning the second seal against the outer surface of the second sealing portion, the second seal can be positioned using the second sealing portion to ensure the sealing effect of the second seal on the first seal.

[0013] In one embodiment, the first seal includes a third sealing portion located within the through hole, wherein the compression ratio of the third sealing portion along the radial direction of the through hole is greater than or equal to 10% and less than or equal to 60%. By setting the compression ratio of the third sealing portion along the radial direction of the through hole to be greater than or equal to 10% and less than or equal to 60%, the sealing effect and sealing stability between the third sealing portion and the cover plate can be effectively ensured.

[0014] In one embodiment, the cover assembly is used for a battery. The first side faces the interior of the battery, and the second side has a limiting groove. The bottom surface of the limiting groove has the through hole, and the second sealing part is located within the limiting groove. The second side of the cover has a limiting groove for defining the installation position of the first sealing element, and the limiting groove communicates with the through hole. The diameter of the limiting groove is larger than the diameter of the through hole, that is, a stepped surface is formed between the side of the limiting groove and the inner surface of the through hole to facilitate the stable assembly of the first sealing element and the cover.

[0015] In one embodiment, the first side surface is provided with a protruding structure that extends circumferentially along the through hole. The protruding structure is located within the groove and abuts against the bottom surface of the groove along the radial direction of the through hole and one of its side surfaces along the axial direction of the through hole. By providing a protruding structure on the first side surface and embedding the protrusion into the groove, sufficient sealing area can be ensured between the cover plate and the first sealing element to improve the sealing effect between the first sealing element and the cover plate.

[0016] In one embodiment, the protruding structure extends in a ring shape along the circumference of the through hole, and the outer diameter D1 of the protruding structure and the diameter D2 of the limiting groove satisfy the relationship: 0.8 ≤ D2 / D1 ≤ 1.5; and / or, The protrusion height H1 of the protrusion structure and the depth H2 of the limiting groove satisfy the following relationship: 0.5≤H1 / H2≤2.

[0017] By setting the ratio of the diameter D2 of the limiting groove to the outer diameter D1 of the protruding structure, D2 / D1, to 0.8≤D2 / D1≤1.5, sufficient mating area between the protruding structure and the first seal can be ensured, while avoiding an increase in the weight of the cover plate due to an excessively large protruding structure. This ensures a lightweight design of the cover plate assembly, facilitating its application in the battery. By setting the protrusion height H1 of the protruding structure to the depth H2 of the limiting groove, 0.5≤H1 / H2≤2, the sealing effect between the first seal and the cover plate can be ensured while avoiding interference between the protruding structure and the internal structure of the battery.

[0018] Secondly, embodiments of this application provide a battery including the cover assembly described in any of the preceding claims.

[0019] The beneficial effects of the embodiments of this application are as follows: In embodiments of this application, the cover plate assembly includes a cover plate and a first sealing member. The cover plate has a through hole, and the outer peripheral surface of the first sealing member has a groove. The first sealing member partially passes through the through hole, and the cover plate partially embeds into the groove. The first sealing member is elastic, and the bottom surface of the groove along the radial direction of the through hole abuts against the inner surface of the through hole, so that the first sealing member and the cover plate are in a sealing fit. In this application, the first sealing member uses its own elasticity to pass through the through hole in the cover plate. The portion of the cover plate located at the edge of the through hole is directly embedded in the groove on the first sealing member, and the first sealing member is squeezed by the abutment of the groove against the bottom surface of the groove along the radial direction of the through hole, causing the first sealing member to deform radially, thereby achieving a sealing fit between the first sealing member and the cover plate, and ensuring the sealing stability of the cover plate assembly.

[0020] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0021] 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 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.

[0022] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0023] Figure 1 This is an exploded structural diagram of a cover plate assembly provided in an embodiment of this application; Figure 2 This is provided by the embodiments of this application. Figure 1 Enlarged structural diagram of region A in the middle; Figure 3 This is a cross-sectional structural schematic diagram of a cover plate assembly provided in an embodiment of this application; Figure 4 This is a cross-sectional view of another cover plate assembly provided in an embodiment of this application; Figure 5 This is an exploded structural diagram of a cover plate assembly provided in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures: 1. Cover plate assembly; 11. Cover plate; 111. Through hole; 112. First side surface; 113. Second side surface; 114. Limiting groove; 115. Protruding structure; 116. Reinforcing part; 12. First sealing element; 121. Groove; 122. First sealing part; 123. Second sealing part; 124. Third sealing part; 13. Second sealing element; 2. Battery; 21. Housing assembly; 211. Housing; 212. Terminal structure. Detailed Implementation

[0025] 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.

[0026] First, this application provides a cover plate assembly; please refer to [link to relevant documentation]. Figure 1 and Figure 2 The cover plate assembly 1 includes a cover plate 11, which has a through hole 111. When the cover plate assembly 1 is applied to the battery 2, the through hole 111 can be used to inject liquid into the battery 2, followed by subsequent formation processes. After formation is completed, the through hole 111 can also be used to extract the gas generated during the formation process to ensure the performance of the battery 2. In other words, the through hole 111 on the cover plate 11 can simultaneously serve as a liquid injection hole and a negative pressure formation venting hole, thereby simplifying the structure of the cover plate 11.

[0027] The diameter of the through hole 111 is greater than or equal to 2mm and less than or equal to 6mm. In actual manufacturing, the diameter of the through hole 111 can be set to 2mm, 3mm, 4mm, 5mm or 6mm, etc., and the specific value of its thickness can be selected and adjusted according to the actual design requirements. No special restrictions are imposed here.

[0028] The cover plate assembly 1 also includes a first sealing element 12. The outer peripheral surface of the first sealing element 12 has a groove 121. A portion of the first sealing element 12 passes through the through hole 111, and a portion of the cover plate 11 is embedded within the groove 121. The first sealing element 12 is elastic. The bottom surface of the groove 121, radially adjacent to the through hole 111, abuts against the inner surface of the through hole 111, thereby sealing the first sealing element 12 with the cover plate 11. In other words, the first sealing element 12, utilizing its elasticity, passes through the through hole 111 on the cover plate 11. The portion of the cover plate 11 located at the edge of the through hole 111 is directly embedded in the groove 121 on the first sealing element 12. The abutment between the groove 121 and the bottom surface of the groove 121, radially adjacent to the through hole 111, compresses the first sealing element 12, causing it to deform radially. This achieves a sealing fit between the first sealing element 12 and the cover plate 11, preventing electrolyte leakage from the through hole 111 and thus avoiding any impact on the performance of the battery 2.

[0029] The cover plate assembly 1 in this embodiment includes a cover plate 11 and a first sealing member 12. The cover plate 11 has a through hole 111, and the outer peripheral surface of the first sealing member 12 has a groove 121. The first sealing member 12 partially passes through the through hole 111, and the cover plate 11 is partially embedded in the groove 121. The first sealing member 12 is elastic. The bottom surface of the groove 121 along the radial direction of the through hole 111 abuts against the inner surface of the through hole 111, so that the first sealing member 12 and the cover plate 11 are sealed together. In this application, the first sealing member 12 uses its own elasticity to pass through the through hole 111 on the cover plate 11. The part of the cover plate 11 located at the edge of the through hole 111 is directly embedded in the groove 121 on the first sealing member 12. By abutting against the bottom surface of the groove 121 along the radial direction of the through hole 111, the first sealing member 12 is squeezed, causing the first sealing member 12 to deform radially, so as to achieve a sealing fit between the first sealing member 12 and the cover plate 11, thereby ensuring the sealing stability of the cover plate assembly 1.

[0030] In some embodiments, the cover plate 11 includes opposing first side surface 112 and second side surface 113, and the first sealing member 12 includes a first sealing portion 122 protruding from the first side surface 112 and a second sealing portion 123 protruding from the second side surface 113, with a groove 121 formed between the first sealing portion 122 and the second sealing portion 123. That is, when the cover plate assembly 1 is applied to the battery 2, one of the first sealing portion 122 and the second sealing portion 123 extends into the battery 2, and the other is located outside the battery 2. The portion of the cover plate 11 located at the edge of the through hole 111 is embedded between the first sealing portion 122 and the second sealing portion 123 to achieve a sealing fit between the first sealing member 12 and the cover plate 11.

[0031] In some examples, the first sealing part 122 abuts against the first side surface 112. That is, the first sealing part 122 and the first side surface 112 are sealed together to further improve the sealing effect between the first sealing element 12 and the cover plate 11.

[0032] The area where the first sealing part 122 abuts against the first side surface 112 has a first abutment width L1 in the radial direction along the through hole 111. The first abutment width L1 satisfies the relationship: 0.1mm ≤ L1 ≤ 1.2mm. If the first abutment width L1 is too small, the sealing effect between the first sealing part 122 and the first side surface 112 will be poor; if the first abutment width L1 is too large, it will be difficult for the first sealing member 12 to pass through the through hole 111 and seal with the cover plate 11. By setting the first abutment width L1 to 0.1mm ≤ L1 ≤ 1.2mm, the sealing effect between the first sealing part 122 and the first side surface 112 can be ensured while ensuring the smooth assembly of the first sealing member 12 and the cover plate 11.

[0033] In the actual manufacturing process, the first contact width L1 can be set to 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm or 1.2mm, etc., and the specific value of the width can be selected and adjusted according to the actual design requirements.

[0034] In some examples, the second sealing part 123 abuts against the second side surface 113. That is, the second sealing part 123 and the second side surface 113 are sealed together to further improve the sealing effect between the first sealing member 12 and the cover plate 11.

[0035] The area where the second sealing part 123 abuts against the second side surface 113 has a second abutment width L2 in the radial direction along the through hole 111. The second abutment width L2 satisfies the relationship: 0.1mm ≤ L2 ≤ 1.5mm. If the second abutment width L2 is too small, the sealing effect between the second sealing part 123 and the second side surface 113 will be poor; if the second abutment width L2 is too large, the size of the first sealing member 12 will be too large, which is not conducive to the fit between the first sealing member 12 and the cover plate 11. By setting the second abutment width L2 to 0.1mm ≤ L2 ≤ 1.5mm, the sealing effect between the second sealing part 123 and the second side surface 113 can be ensured while ensuring the effective fit between the first sealing member 12 and the cover plate 11.

[0036] In the actual manufacturing process, the second abutment width L2 can be set to 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm or 1.5mm, etc., and the specific value of the width can be selected and adjusted according to the actual design requirements.

[0037] In some examples, the first sealing part 122 abuts against the first side 112, while the second sealing part 123 abuts against the second side 113. That is, the first sealing member 12 abuts against both the first side 112 and the second side 113 of the cover plate 11 to further improve the sealing effect between the first sealing member 12 and the cover plate 11.

[0038] The cover plate assembly 1 is used for the battery 2, the first side 112 is used to face the interior of the battery 2, the area where the first sealing part 122 abuts against the first side 112 has a first abutting width L1 in the radial direction along the through hole 111, and the area where the second sealing part 123 abuts against the second side 113 has a second abutting width L2 in the radial direction along the through hole 111. The first abutting width L1 and the second abutting width L2 satisfy the relationship: 1≤L2 / L1≤5.

[0039] When the cover plate assembly 1 is applied to the battery 2, the first sealing part 122 extends into the battery 2, and the second sealing part 123 is located outside the battery 2. By setting the first abutment width L1 and the second abutment width L2 to 1≤L2 / L1≤5, the second abutment width L2 is greater than the first abutment width L1. This ensures the sealing effect between the first sealing member 12 and the cover plate 11, while also facilitating the assembly of the first sealing member 12 and the cover plate 11. At the same time, it also avoids the difference between the second abutment width L2 and the first abutment width L1 being too large, thereby ensuring the structural stability of the first sealing member 12 itself.

[0040] In the actual production process, the ratio L2 / L1 of the second abutment width L2 to the first abutment width L1 can be set to 1, 2, 3, 4 or 5, etc. The specific ratio can be selected and adjusted according to the actual design requirements, and there are no special restrictions here.

[0041] The thickness of the cover plate 11 can be set to be greater than or equal to 0.2 mm and less than or equal to 1 mm, and the thickness of the second sealing part 123 can be set to be greater than or equal to 0.3 mm and less than or equal to 0.5 mm, so as to ensure effective cooperation between the first sealing member 12 and the cover plate 11.

[0042] In the actual manufacturing process, the thickness of the cover plate 11 can be set to 0.2mm, 0.5mm or 1mm, etc., and the thickness of the second sealing part 123 can be set to 0.3mm, 0.4mm or 0.5mm, etc. The specific value of its thickness can be selected and adjusted according to the actual design requirements, and no special restrictions are imposed here.

[0043] In some embodiments, please refer to Figure 3The cover assembly 1 is used for the battery 2. A first side 112 faces the interior of the battery 2. The cover assembly 1 also includes a second seal 13, which is located on the second side 113 of the cover 11. The second seal 13 covers and adheres to the outer surface of the second sealing portion 123, and is connected to the cover 11. That is, when the cover assembly 1 is applied to the battery 2, the first sealing portion 122 extends into the battery 2, the second sealing portion 123 is located outside the battery 2, and the second seal 13 is also located outside the battery 2, sealing the first seal 122 to further improve the sealing effect of the cover assembly 1. By setting the second seal 13 to adhere to the outer surface of the second sealing portion 123, the second seal 13 can be positioned using the second sealing portion 123, ensuring the sealing effect of the second seal 13 on the first seal 12.

[0044] The edge of the second seal 13 can be thinned, that is, the side surface of the second seal 13 can be set as a bevel, and the thickness is thinner closer to the edge, so as to facilitate the welding connection between the second seal 13 and the cover plate 11.

[0045] In some examples, the width of the area where the second seal 13 abuts against the second side 113 in the radial direction along the through hole 111 can be set to be greater than or equal to 0.5 mm and less than or equal to 3 mm, for example, 0.5 mm, 1 mm, 2 mm, or 3 mm, to ensure the stability of the fit between the second seal 13 and the cover plate 11. The thickness of the second seal 13 can be set to be greater than or equal to 0.2 mm and less than or equal to 1.2 mm, for example, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, or 1.2 mm.

[0046] In some examples, the cover plate 11 is provided with a reinforcing portion 116, which protrudes from the first side 112 to the second side 113 and extends circumferentially along the through hole 111 in an annular shape. The first seal 12 and the second seal 13 are disposed within the area enclosed by the reinforcing portion 116, and a gap may be left between the second seal 13 and the outer surface of the second sealing portion 123 of the first seal 12. That is to say, the provision of the reinforcing portion 116 helps to enhance the strength of the cover plate 11, and at the same time, it can limit the placement of the second seal 13 to facilitate the assembly between the second seal 13 and the cover plate 11.

[0047] The minimum diameter of the annular region enclosed by the reinforcing part 116 is greater than or equal to 5 mm and less than or equal to 15 mm, and the maximum diameter of the annular region enclosed by the reinforcing part 116 is greater than or equal to 5 mm and less than or equal to 20 mm. The ratio of the maximum to the minimum diameter of the annular region enclosed by the reinforcing part 116 is greater than or equal to 1 and less than or equal to 2, so that the sidewall of the annular region enclosed by the reinforcing part 116 is inclined, and the inclination angle is greater than or equal to 90° and less than or equal to 150°, so as to facilitate the installation of the second seal 13 and the welding connection with the second seal 13.

[0048] The reinforcing part 116 forms a raised area on the corresponding second side 113 and a recessed area on the corresponding first side 112. The maximum width of the recessed area is greater than or equal to 0.4 mm and less than or equal to 2 mm, the minimum width of the recessed area is greater than or equal to 0.1 mm and less than or equal to 1.4 mm, and the ratio of the maximum to the minimum width of the recessed area is greater than or equal to 2.5 and less than or equal to 15. The depth of the recessed area is greater than or equal to 0.4 mm and less than or equal to 1.5 mm. This ensures that the reinforcing part 116 is neither too sharp nor too flat, thereby ensuring the reinforcing effect of the reinforcing part 116 on the overall structural strength of the cover plate 11. At the same time, it can also reduce the stress concentration generated on the reinforcing part 116, so as to further improve the overall structural stability of the cover plate 11.

[0049] Furthermore, a gap exists between the second seal 13 and the second sealing portion 123 of the first seal 12, and this gap is less than or equal to 0.5 mm. By providing a gap between the second seal 13 and the second sealing portion 123, there is no compression between the second seal 13 and the first seal 12, so that when the second seal 13 is welded to the cover plate 11, no additional tools are needed for fixing, thus simplifying the welding process between the second seal 13 and the cover plate 11. When the cover plate assembly 1 is applied to the battery 2, the cover plate assembly 1 is located at one end of the battery 2 casing. To avoid the cover plate assembly 1 affecting the flatness of the battery 2 end, the second seal 13 can be set lower than the end of the casing, and the distance between the second seal 13 and the end of the casing is less than or equal to 1 mm.

[0050] In some embodiments, the first seal 12 includes a third sealing portion 124 located within the through hole 111. The compression ratio of the diameter of the third sealing portion 124 along the radial direction of the through hole 111 is greater than or equal to 10% and less than or equal to 60%. That is, the compression ratio of the diameter of the third sealing portion 124 after the first seal 12 is installed relative to the diameter of the first seal 12 before installation is greater than or equal to 10% and less than or equal to 60%, i.e., (after installation - before installation) / before installation × 100% = 10%~60%. If the compression ratio of the third sealing portion 124 is too small, it may result in a poor sealing effect between the third sealing portion 124 and the cover plate 11; if the compression ratio of the third sealing portion 124 is too large, it may result in over-compression of the third sealing portion 124, thereby causing the third sealing portion 124 to reach the fatigue critical point, which is also detrimental to the sealing stability between the third sealing portion 124 and the cover plate 11. In this embodiment of the application, by setting the compression rate of the diameter of the third sealing part 124 in the radial direction along the through hole 111 to be greater than or equal to 10% and less than or equal to 60%, the sealing effect and sealing stability between the third sealing part 124 and the cover plate 11 can be effectively ensured.

[0051] In the actual manufacturing process, the compression rate of the diameter of the third sealing part 124 along the radial direction of the through hole 111 can be set to 10%, 20%, 30%, 40%, 50% or 60%, etc. The specific value of the compression rate can be selected and adjusted according to the actual design requirements, and no special restrictions are imposed here.

[0052] In some embodiments, please refer to Figure 4 The cover plate assembly 1 is used for the battery 2. The first side 112 faces the interior of the battery 2, and the second side 113 has a limiting groove 114. The bottom surface of the limiting groove 114 has a through hole 111, and the second sealing part 123 is located in the limiting groove 114. That is, the second side 113 of the cover plate 11 has a limiting groove 114 for limiting the installation position of the first sealing member 12, and the limiting groove 114 communicates with the through hole 111. The diameter of the limiting groove 114 is larger than the diameter of the through hole 111, that is, a stepped surface is formed between the side of the limiting groove 114 and the inner surface of the through hole 111, so as to facilitate the stable assembly of the first sealing member 12 and the cover plate 11.

[0053] In some examples, the first side 112 is provided with a protruding structure 115, which extends circumferentially along the through hole 111. The protruding structure 115 is located in the groove 121 and abuts against the bottom surface of the groove 121 radially along the through hole 111 and one of the sides of the groove 121 axially along the through hole 111. Since the second side 113 of the cover plate 11 has a limiting groove 114, the thickness of the portion of the cover plate 11 embedded in the groove 121 is reduced. By providing the protruding structure 115 on the first side 112 and embedding the protrusion in the groove 121, it is possible to ensure that there is a sufficient sealing area between the cover plate 11 and the first seal 12, thereby improving the sealing effect between the first seal 12 and the cover plate 11.

[0054] The raised structure 115 extends circumferentially along the through hole 111 in an annular shape. The outer diameter D1 of the raised structure 115 and the diameter D2 of the limiting groove 114 satisfy the relationship: 0.8≤D2 / D1≤1.5. By setting the ratio D2 / D1 of the diameter D2 of the limiting groove 114 to the outer diameter D1 of the raised structure 115 to 0.8≤D2 / D1≤1.5, it is possible to ensure that there is sufficient mating area between the raised structure 115 and the first seal 12, and to avoid the increased weight of the cover plate 11 due to the excessive size of the raised structure 115. This ensures the lightweight design of the cover plate assembly 1, which is convenient for its application in the battery 2.

[0055] In the actual manufacturing process, the ratio D2 / D1 of the diameter D2 of the limiting groove 114 to the outer diameter D1 of the protrusion structure 115 can be set to 0.8, 1.0, 1.2 or 1.5, etc. The specific value of the ratio can be selected and adjusted according to the actual design requirements, and no special restrictions are imposed here.

[0056] In some examples, the outer diameter D1 of the protrusion 115 can be set to be greater than or equal to 2.2 mm and less than or equal to 8 mm, for example, 2.2 mm, 3 mm, 5 mm, or 8 mm; the diameter D2 of the limiting groove 114 can be set to be greater than or equal to 2.2 mm and less than or equal to 12 mm, for example, 2.2 mm, 3 mm, 5 mm, 8 mm, 10 mm, or 12 mm. The specific values ​​of the outer diameter D1 of the protrusion 115 and the diameter D2 of the limiting groove 114 can be selected and adjusted according to actual design requirements, and no special restrictions are imposed here.

[0057] In some examples, the protrusion height H1 of the protrusion structure 115 and the depth H2 of the limiting groove 114 satisfy the relationship: 0.5 ≤ H1 / H2 ≤ 2. If this ratio is too large, the protrusion height of the protrusion structure 115 may be too large, which may cause interference between the protrusion structure 115 and the internal structure of the battery 2 when the cover assembly 1 is applied to the battery 2. If this ratio is too small, the protrusion height of the protrusion structure 115 may be too small, resulting in a smaller mating area between the protrusion structure 115 and the first seal 12, thus leading to a poor sealing effect between the first seal 12 and the cover 11. By setting the protrusion height H1 of the protrusion structure 115 and the depth H2 of the limiting groove 114 to 0.5 ≤ H1 / H2 ≤ 2, it is possible to ensure the sealing effect between the first seal 12 and the cover 11 while avoiding interference between the protrusion structure 115 and the internal structure of the battery 2.

[0058] In the actual manufacturing process, the ratio of the protrusion height H1 of the protrusion structure 115 to the depth H2 of the limiting groove 114 can be set to 0.5, 1, 1.5 or 2, etc. The specific value of the ratio can be selected and adjusted according to the actual design requirements, and no special restrictions are imposed here.

[0059] In some examples, the protrusion height H1 of the protrusion structure 115 can be set to be greater than or equal to 0.1 mm and less than or equal to 0.9 mm, for example, 0.1 mm, 0.3 mm, 0.5 mm, or 0.9 mm; the depth H2 of the limiting groove 114 can be set to be greater than or equal to 0.1 mm and less than or equal to 0.9 mm, for example, 0.1 mm, 0.3 mm, 0.5 mm, or 0.9 mm. The specific values ​​of the protrusion height H1 of the protrusion structure 115 and the depth H2 of the limiting groove 114 can be selected and adjusted according to actual design requirements, and no special restrictions are imposed here.

[0060] Secondly, this application provides a battery including 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.

[0061] Please see Figure 5 The battery 2 includes a housing assembly 21 and a cover assembly 1. The housing assembly 21 includes a housing 211 and a terminal structure 212. The terminal structure 212 is disposed at one end of the housing 211, and the cover assembly 1 is disposed at the other end of the housing 211 and is used to seal the housing 211. The battery 2 also includes a winding core, which is disposed inside the housing 211 and electrically connected to the terminal structure 212.

[0062] For details, please refer to Figure 1 and Figure 2 The cover plate assembly 1 includes a cover plate 11 and a first sealing member 12. The cover plate 11 has a through hole 111, and the outer peripheral surface of the first sealing member 12 has a groove 121. The first sealing member 12 partially passes through the through hole 111, and the cover plate 11 is partially embedded in the groove 121. The first sealing member 12 is elastic. The bottom surface of the groove 121 along the radial direction of the through hole 111 abuts against the inner surface of the through hole 111, so that the first sealing member 12 and the cover plate 11 are sealed together. In this application, the first sealing member 12 uses its own elasticity to pass through the through hole 111 on the cover plate 11. The part of the cover plate 11 located at the edge of the through hole 111 is directly embedded in the groove 121 on the first sealing member 12. By abutting against the bottom surface of the groove 121 along the radial direction of the through hole 111, the first sealing member 12 is squeezed, causing the first sealing member 12 to deform radially, so as to achieve a sealing fit between the first sealing member 12 and the cover plate 11, thereby ensuring the sealing stability of the cover plate assembly 1.

[0063] 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 (1), characterized in that, include: Cover plate (11), wherein the cover plate (11) is provided with a through hole (111); A first sealing element (12) has a groove (121) on its outer peripheral surface. The first sealing element (12) partially passes through the through hole (111) and the cover plate (11) is partially embedded in the groove (121). The first sealing element (12) is elastic. The bottom surface of the groove (121) along the radial direction of the through hole (111) abuts against the inner surface of the through hole (111) so that the first sealing element (12) and the cover plate (11) are sealed together.

2. The cover plate assembly (1) according to claim 1, characterized in that, The cover plate (11) includes opposing first side surfaces (112) and second side surfaces (113), the first sealing member (12) includes a first sealing portion (122) protruding from the first side surface (112) and a second sealing portion (123) protruding from the second side surface (113), and the groove (121) is formed between the first sealing portion (122) and the second sealing portion (123); wherein, The first sealing portion (122) abuts against the first side surface (112); and / or, The second sealing part (123) abuts against the second side (113).

3. The cover plate assembly (1) according to claim 2, characterized in that, The area where the first sealing portion (122) abuts against the first side surface (112) has a first abutment width L1 in the radial direction along the through hole (111), the first abutment width L1 satisfying the relationship: 0.1mm ≤ L1 ≤ 1.2mm; and / or, The area where the second sealing part (123) abuts against the second side surface (113) has a second abutment width L2 in the radial direction along the through hole (111), and the second abutment width L2 satisfies the relationship: 0.1mm≤L2≤1.5mm.

4. The cover plate assembly (1) according to claim 2, characterized in that, The cover assembly (1) is used for the battery (2), the first side (112) is used to face the interior of the battery (2), the area where the first sealing part (122) abuts against the first side (112) has a first abutting width L1 in the radial direction along the through hole (111), the area where the second sealing part (123) abuts against the second side (113) has a second abutting width L2 in the radial direction along the through hole (111), and the first abutting width L1 and the second abutting width L2 satisfy the relationship: 1≤L2 / L1≤5.

5. The cover plate assembly (1) according to claim 2, characterized in that, The cover plate assembly (1) is used for the battery (2), the first side (112) is used to face the interior of the battery (2), the cover plate assembly (1) further includes a second seal (13), the second seal (13) is disposed on the second side (113) of the cover plate (11), the second seal (13) covers the outer surface of the second sealing part (123) and fits against the outer surface of the second seal (13), and the second seal (13) is connected to the cover plate (11).

6. The cover plate assembly (1) according to any one of claims 1 to 5, characterized in that, The first seal (12) includes a third sealing portion (124) located within the through hole (111), the third sealing portion (124) having a compression ratio of a diameter in the radial direction of the through hole (111) greater than or equal to 10% and less than or equal to 60%.

7. The cover plate assembly (1) according to any one of claims 2 to 5, characterized in that, The cover plate assembly (1) is used for the battery (2), the first side (112) is used to face the interior of the battery (2), the second side (113) is provided with a limiting groove (114), the bottom surface of the limiting groove (114) is provided with the through hole (111), and the second sealing part (123) is located in the limiting groove (114).

8. The cover plate assembly (1) according to claim 7, characterized in that, The first side surface (112) is provided with a protruding structure (115), which extends circumferentially along the through hole (111), and is located in the groove (121), and abuts against the bottom surface of the groove (121) radially along the through hole (111) and one of the side surfaces axially along the through hole (111).

9. The cover plate assembly (1) according to claim 8, characterized in that, The protruding structure (115) extends in a ring shape along the circumference of the through hole (111), and the outer diameter D1 of the protruding structure (115) and the diameter D2 of the limiting groove (114) satisfy the relationship: 0.8 ≤ D2 / D1 ≤ 1.5; and / or, The protrusion height H1 of the protrusion structure (115) and the depth H2 of the limiting groove (114) satisfy the following relationship: 0.5≤H1 / H2≤2.

10. A battery (2), characterized in that, Includes the cover plate assembly (1) as described in any one of claims 1 to 9.

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