Sealing member and battery cap

Abstract

A sealing member and a battery cap. The sealing member (100) comprises a body (1) and an adhesive structure (5). The body (1) is hollow and annular. The body (1) comprises a first ring body (11) and a second ring body (12) which are axially connected. The first ring body (11) and the second ring body (12) are both hollow and annular, and the inner diameter of the first ring body (11) is larger than the inner diameter of the second ring body (12). The second ring body (12) comprises a first surface (2) and a second surface (3), and the first surface (2) and the second surface (3) are oppositely arranged in the axial direction of the second ring body (12). The adhesive structure (5) comprises a first adhesive (51) and a second adhesive (52). The first adhesive (51) is arranged on the surface of the body (1). The second adhesive (52) is arranged at the positions of the first adhesive (51) located on the first surface (2) and / or the second surface (3).

Description

Seals and battery caps

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 18, 2023, with application number 202323465505.9. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a seal and a battery cap. Background Art

[0003] In the related art, the cap sealing ring located on the battery needs to be coated with multiple glues on the surface to improve its sealing performance of the gap between the battery shell and the cap during battery packaging. The related coating process is to apply one type of glue to a local area of ​​the sealing ring, and then apply another type of glue to the entire surface of the sealing ring. Therefore, there will be multiple layers of different types of glue in some areas of the sealing ring. SUMMARY OF THE INVENTION

[0004] However, when applying another type of glue to the entire surface of the sealing ring, a roller device is required for rotary coating. The glue that is preferentially applied to a part of the sealing ring will cause the glue surface to be uneven and have a poor appearance due to collision and friction with the roller device during this process, thereby resulting in poor sealing performance after the two different types of glue are superimposed and coated.

[0005] In a first aspect, the present application provides a seal comprising:

[0006] The main body is hollow and annular. The main body includes a first ring body and a second ring body connected along its axial direction. The first ring body and the second ring body are both hollow and annular. The inner diameter of the first ring body is

[0007] The inner diameter of the second ring body is larger than that of the second ring body, the second ring body includes a first surface and a second surface, the first surface and the second surface are arranged opposite to each other in the axial direction of the second ring body; and

[0008] The colloid structure comprises a first colloid and a second colloid. The first colloid is arranged on the surface of the body, and the second colloid is arranged at the position where the first colloid is located on the first surface and / or the second surface.

[0009] In a second aspect, the present application provides a battery cap, which includes a sealing member. Beneficial effects

[0010] In the embodiment of the present application, the first colloid is preferentially coated on the main body, and then the second colloid is coated on the area of ​​the second ring body corresponding to the area to be coated with the second colloid, that is, the coating order of the second colloid is after the coating order of the first colloid. When the first colloid is coated on the surface of the main body by a roller device, the second colloid is not provided on the second ring body, thereby avoiding interference between the second colloid and the roller device, which makes the glue surface of the second colloid uneven, thereby improving the sealing performance of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a schematic cross-sectional view of a sealing member provided in the present application;

[0012] FIG2 is an enlarged schematic diagram of the structure of point A in FIG1 ;

[0013] FIG3 is an enlarged schematic diagram of the structure at point B in FIG1 ;

[0014] FIG4 is an enlarged schematic diagram of the structure at B in FIG1 ;

[0015] FIG5 is a perspective schematic diagram of the main body provided by the present application;

[0016] FIG6 is a schematic cross-sectional view of the cap assembly provided in the present application.

[0017] Description of reference numerals:

[0018] 100. Seal; 1. Main body; 11. First ring; 12. Second ring; 2. First surface; 3. Second surface; 5. Colloid structure; 51. First colloid; 52. Second colloid; 1A. Third surface; 21. First sub-surface; 6. Protrusion; 22. Second sub-surface; 23. Third sub-surface; 7. Fourth surface; 8. Fifth surface; 31. Fourth sub-surface; 32. Fifth sub-surface; 33. Sixth sub-surface; 9. Cap; 10. Explosion-proof disk; 11A. First cavity; 12A. Second cavity. Modes for Carrying Out the Invention

[0019] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0020] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, with the first feature having a higher horizontal height than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, with the first feature having a lower horizontal height than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," "right," "front," and "rear" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not have any special meanings.

[0022] This application provides a seal 100, and Figures 1 to 6 illustrate an embodiment of this application. It should be noted that the axial direction of the body 1, first ring body 11, and second ring body 12 described below is the X-direction in Figure 1, while the radial direction of the body 1, first ring body 11, and second ring body 12 is any straight line direction on a plane perpendicular to the X-direction in Figure 1.

[0023] Please refer to Figures 1 to 6. The seal 100 includes a body 1 and a colloid structure 5. The body 1 is hollow annular and includes a first ring body 11 and a second ring body 12 connected along its axial direction. The first ring body 11 and the second ring body 12 are both hollow annular, and the inner diameter of the first ring body 11 is larger than the inner diameter of the second ring body 12. The second ring body 12 includes a first surface 2 and a second surface 3, which are arranged opposite to each other in the axial direction of the second ring body 12; the colloid structure 5 includes a first colloid 51 and a second colloid 52. The first colloid 51 is arranged on the surface of the body 1, and the second colloid 52 is arranged at the position where the first colloid 51 is located on the first surface 2 and / or the second surface 3.

[0024] In the embodiment of the present application, the first colloid 51 is preferentially coated on the main body 1, and then the second colloid 52 is coated on the area of ​​the second ring body 12 corresponding to the area to be coated with the second colloid 52, that is, the coating order of the second colloid 52 is located after the coating order of the first colloid 51. When the first colloid 51 is coated on the surface of the main body 1 by a roller device, the second colloid 52 is not provided on the second ring body 12, thereby avoiding interference between the second colloid 52 and the roller device, which makes the glue surface of the second colloid 52 uneven, thereby improving the sealing performance of the seal 100.

[0025] In one embodiment of the present application, the second colloid 52 may be coated on the first surface 2; in another embodiment of the present application, the second colloid 52 may be coated on the second surface 3; in another embodiment of the present application, the second colloid 52 may be coated on both the first surface 2 and the second surface 3.

[0026] In one embodiment of the present application, the second colloid 52 is coated on the first colloid 51 on the first surface 2 and the second surface 3 to further improve the sealing between the explosion-proof disk 10 and the body 1 and the sealing between the battery housing and the body 1.

[0027] In some embodiments of the present application, the materials of the second colloid 52 located on the first surface 2 and the second colloid 52 located on the second surface 3 may be the same or different. In one embodiment of the present application, the materials of the second colloid 52 located on the first surface 2 and the second colloid 52 located on the second surface 3 are different; wherein, the second colloid 52 located on the first surface 2 and the second colloid 52 located on the second surface 3 are both normal alkane colloids. Among them, the model of the second colloid 52 located on the first surface 2 is HLI-T11 and M-13Z. The model of the second colloid 52 located on the second surface 3 is HWT-09D and HWT-20D. Of course, the model of the second colloid 52 is not limited to the above glue model. Any glue model used in related technologies to improve the sealing of battery structures can be applied to the embodiments of the present application.

[0028] It should be added that, in one embodiment of the present application, the first colloid 51 is asphalt glue, and the asphalt glue is a normal alkane colloid; the model of the asphalt glue can be M-13S0-A, HLI-015MB, etc.

[0029] Among them, the first colloid 51 (i.e., asphalt glue) is rotated and brushed using a roller device, so as to be coated on the entire outer surface of the body 1, thereby improving the sealing performance of the seal 100 applied to the battery structure, and the second colloid 52 is locally coated and coated on the first colloid 51, in order to further strengthen the sealing performance between the seal 100 and other components in the battery structure, such as the battery shell and the explosion-proof disk 10.

[0030] In addition, since the inner diameter of the first ring body 11 is larger than the inner diameter of the second ring body 12, the first surface 2 or the second surface 3 located on the second ring body 12 can be connected to the surface of the first ring body 11 that encloses its inner cavity and is set at an angle, thereby providing for the installation of components such as the explosion-proof disk 10 and the cap 9.

[0031] Referring to Figures 1 to 3 , in one embodiment of the present application, the first ring body 11 has a first cavity 11A and includes a third surface 1A, which serves as the inner wall of the first cavity 11A. The first surface 2 includes an annular first sub-surface 21 connected to the third surface 1A, and a second colloid 52 is disposed on the first sub-surface 21. The first sub-surface 21 is annular and connected to the third surface 1A, forming a mounting platform for positionally securing components such as the bursting disk 10. The bursting disk 10 directly contacts the third surface 1A in the axial direction of the body 1, and therefore the second colloid 52 is disposed on the first sub-surface 21. This provides both the first colloid 51 and the second colloid 52 between the bursting disk 10 and the body 1, further enhancing the sealing between the bursting disk 10 and the body 1.

[0032] In some embodiments of the present application, the second colloid 52 disposed on the first sub-surface 21 is arranged in an annular shape, and the inner diameter of the second colloid 52 disposed on the first sub-surface 21 is D1, and the inner diameter of the first sub-surface 21 is D2; wherein D1 and D2 satisfy: D1 ≥ D2. That is, such an arrangement can ensure that the second colloid 52 is located on the first sub-surface 21 after coating, and the second colloid 52 will not overflow. wherein, the outer diameter of the second colloid 52 disposed on the first sub-surface 21 is D3, and the outer diameter of the first sub-surface 21 is D4, and D3 and D4 also satisfy: D3 ≤ D4. That is, the third surface 1A can stop the second colloid 52 coated on the first sub-surface 21 in the axial direction of the main body 1, and can also ensure that D3 and D4 satisfy the relationship D3 ≤ D4.

[0033] In some embodiments of the present application, D2 also satisfies: D2 ≥ 14.4 mm. Among them, on the basis of D1 ≥ D2 in the embodiment of the present application, D1 ≥ 14.4 mm is further provided. That is, the value of D1 is greater than or equal to 14.4 mm to ensure that there will be no glue overflow when the second colloid 52 is coated on the first sub-surface 21. It should be noted that the specific dimensions of the inner diameter D2 and the outer diameter D4 of the first sub-surface 21 vary according to the size of the seal 100. In one embodiment of the present application, the seal 100 is applied to a 21700 model cylindrical battery, so the value of D2 is 16.8 mm and the value of D4 is 19.15 mm, that is, D1 ≥ 16.8 mm and D3 ≤ 19.15 mm can ensure that there will be no glue overflow when the second colloid 52 is coated on the first sub-surface 21. In another embodiment of the present application, the seal 100 is applied to a 18650 cylindrical battery, so the value of D2 is 14.40 mm, and the value of D4 is 16.45 mm, that is, D1 ≥ 14.40 mm and D3 ≤ 16.45 mm, which can ensure that no glue overflow occurs when the second colloid 52 is coated on the first sub-surface 21.

[0034] 2 to 4 , a ring-shaped protrusion 6 is further formed on the first sub-surface 21 . The height of the protrusion 6 in the axial direction of the second ring body 12 is greater than the thickness of the second colloid 52 in the axial direction of the second ring body 12 . Please further refer to Figure 6. With such an arrangement, when the explosion-proof disk 10 is assembled into the main body 1 of the seal 100, at least a portion of the protrusion 6 contacts the explosion-proof disk 10. At this time, due to the lack of external force, the protrusion 6 and the explosion-proof disk 10 are only in contact and the sealing between the protrusion 6 and the explosion-proof disk 10 is poor. When the main body 1 is assembled into the battery housing and the battery is formed, the battery housing will squeeze the main body 1 in the axial direction of the main body 1, thereby making the sealing of the gap between the protrusion 6 and the explosion-proof disk 10 better. The second colloid 52 further seals the gap between the explosion-proof disk 10 and the main body 1 on the basis of the protrusion 6, that is, the arrangement of the protrusion 6 and the second colloid 52 is to seal the gap between the first sub-surface 21 and the explosion-proof disk 10. First, the protrusion 6 contacts the explosion-proof disk 10 and undergoes a certain deformation, so that the sealing between the protrusion 6 and the explosion-proof disk 10 is better. Then, the second colloid 52 contacts the explosion-proof disk 10 and bonds the explosion-proof disk 10 to the first sub-surface 21 to achieve a good sealing effect. It is understandable that, because the burst-proof disk 10 squeezes the protrusion 6, reducing its axial height of the second ring body 12, the second colloid 52, which has a thickness less than the height of the protrusion 6, can contact the burst-proof disk 10 only after the protrusion 6 is deformed, thereby avoiding contact between the burst-proof disk 10 and the second colloid 52 at the beginning of the deformation of the protrusion 6, thereby squeezing the second colloid 52 and causing the second colloid 52 to overflow.

[0035] In some embodiments of the present application, the second colloid 52 is located between the protrusion 6 and the third surface 1A in the radial direction of the second ring body 12. That is, the protrusion 6 and the third surface 1A limit the second colloid 52 in the radial direction of the second ring body 12. Furthermore, the height of the protrusion 6 in the axial direction of the second ring body 12 is greater than the thickness of the second colloid 52 in the axial direction of the second ring body 12, thereby effectively preventing the second colloid 52 from overflowing from the first sub-surface 21.

[0036] The height of the protrusion 6 in the axial direction of the second ring 12 is H; H satisfies the following: 0.10mm≤H≤0.16mm. Setting the height of the protrusion 6 within the range of 0.10mm≤H≤0.16mm facilitates assembly of components within the cavity of the main body 1. The protrusion 6 also serves to elevate the burst disk 10. If the height of the protrusion 6 is less than 0.10mm, interference between the burst disk 10 and the current interrupt device (CID) may occur. If the height of the protrusion 6 is greater than 0.16mm, assembly of components such as the burst disk 10 and the cap 9 within the main body 1 may be affected.

[0037] The second colloid 52 disposed on the first sub-surface 21 has a thickness T1 in the axial direction of the second ring body 12; T1 satisfies the following relationship: 0 < T1 < 0.10 mm. Setting the thickness T1 of the second colloid 52 within the range of 0 < T1 < 0.10 mm allows the glue coating equipment to complete the application of the second colloid 52 in a single application, thus saving processing steps in the manufacturing of the seal 100. If the thickness T1 of the second colloid 52 is greater than or equal to 0.10 mm, i.e., this value is the minimum height value of the height H of the protrusion 6, the second colloid 52 may be prone to overflowing when the protrusion 6 deforms.

[0038] Furthermore, the weight of the second colloid 52 disposed on the first sub-surface 21 is M, where M satisfies the following: 5 mg ≤ M ≤ 9 mg. In other words, the weight of the second colloid 52 is between 5 mg and 9 mg, based on the thickness of the second colloid 52 in the axial direction of the second ring body 12 and the coating area of ​​the second colloid 52 on the first sub-surface 21.

[0039] Referring to Figure 3 , the first surface 2 also includes a second sub-surface 22 and a third sub-surface 23. The second sub-surface 22 is annular and has an outer diameter smaller than the inner diameter of the first sub-surface 21. The second sub-surface 22 is located on the side of the first sub-surface 21 axially away from the first ring body 11. The third sub-surface 23 connects the first sub-surface 21 and the second sub-surface 22. This arrangement prevents the seal 100 from squeezing the current interrupt device (CID) located within the body 1 during assembly, thereby affecting the performance of the CID.

[0040] Referring to Figures 1 and 4 , in some embodiments of the present application, the second ring body 12 has a second cavity 12A and further includes a fourth surface 7 and a fifth surface 8. The fourth surface 7 is the inner wall of the second cavity 12A, and the fifth surface 8 is disposed radially opposite to the fourth surface 7 of the second ring body 12. The second surface 3 includes an annular fourth sub-surface 31 and a fifth sub-surface 32 connecting the fourth sub-surface 31 and the fifth surface 8. The fourth sub-surface 31 connects to the fourth surface 7, and the fifth sub-surface 32 is inclined in the axial direction of the second ring body 12. The second colloid 52 is disposed on the fifth sub-surface 32. That is, in this embodiment, the fifth sub-surface 32 is in direct contact with the battery housing. In addition to the first colloid 51 coated on the second surface 3, the second colloid 52 is further coated on the fifth sub-surface 32 to enhance the sealing between the body 1 and the battery housing.

[0041] Referring to Figures 3 and 4, in some embodiments of the present application, the distance from the connection between the fifth sub-surface 32 and the fourth sub-surface 31 to the connection between the fifth sub-surface 32 and the fifth surface 8 is L1, and the length of the second colloid 52 provided on the fifth sub-surface 32 in the direction from the connection between the fifth sub-surface 32 and the fourth sub-surface 31 to the connection between the fifth sub-surface 32 and the fifth surface 8 is L2; ​​wherein, L1 and L2 satisfy: 0.7mm≤L2≤L1. The length L2 of the second colloid 52 is set within this range, which can meet the sealing performance of the second colloid 52 between the battery housing and the body 1; if L2 is less than 0.7mm, the second colloid 52 is not fully filled, that is, there may be a gap between the fifth sub-surface 32 of the second ring body 12 coated with the second colloid 52 and the battery housing; if L2 is greater than L1, the second colloid 52 will overflow.

[0042] L2 also satisfies the following requirement: L2 ≤ 1.8 mm. That is, setting L2 to be less than or equal to 1.8 mm and greater than or equal to 1 mm ensures sufficient filling of the second colloid 52 while also preventing overflow of the second colloid 52. It is understood that to avoid the risk of overflow of the second colloid 52 on the fifth sub-surface 32, L1 is set to be greater than or equal to 1.8 mm.

[0043] It should be noted that the length L2 of the second colloid 52 is adjusted according to the size change of the seal 100 to ensure that the second colloid 52 is fully filled and does not overflow from the fifth sub-surface 32. In one embodiment of the present application, the seal 100 is applied to a 21700 cylindrical battery, and the value of L1 is 1.8mm, that is, L2 is set to be less than or equal to 1.8mm, which can prevent the second colloid 52 from overflowing from the fifth sub-surface 32. At the same time, the value of L2 is greater than or equal to 1mm, so as to ensure that the second colloid 52 is fully filled between the battery shell and the body 1. In another embodiment of the present application, the seal 100 is applied to an 18650 cylindrical battery, and the value of L1 is 1mm, that is, L2 is set to be less than or equal to 1mm, which can prevent the second colloid 52 from overflowing from the fifth sub-surface 32. At the same time, the value of L2 is greater than or equal to 0.7mm, so as to ensure that the second colloid 52 is fully filled between the battery shell and the body 1.

[0044] In addition, please refer to Figures 3 and 4, which are both enlarged schematic views of point B in Figure 1; for ease of understanding, the fifth sub-surface 32 in Figure 4 is not provided with the second colloid 52, while the fifth surface 8 in Figure 3 is provided with the second colloid 52.

[0045] Referring to Figures 1, 3, and 4, the second surface 3 also includes a sixth sub-surface 33 extending axially along the second ring 12. The sixth sub-surface 33 connects the fourth sub-surface 31 and the fifth sub-surface 32. In the axial direction of the second ring 12, the second colloid 52 does not protrude beyond the plane of the fourth sub-surface 31. The sixth sub-surface 33 forms a depression on the fifth sub-surface 32 in the plane of the fourth sub-surface 31. This means that the second colloid 52 is coated on the fifth sub-surface 32 and, constrained by the sixth sub-surface 33, does not overflow onto the fourth sub-surface 31. Furthermore, the second colloid 52 does not protrude axially beyond the plane of the fourth sub-surface 31 in the second ring 12. As can be appreciated, during assembly of the battery body 1, the battery housing does not directly contact the second colloid 52. Instead, it contacts the second colloid 52 only after a portion of the fourth sub-surface 31 undergoes structural deformation. This prevents the risk of the second colloid 52 overflowing during assembly of the battery body 1 and the battery housing.

[0046] In one embodiment of the present application, the second colloid 52 disposed on the fifth sub-surface 32 has a thickness T2 in a direction perpendicular to the fifth sub-surface 32 ; wherein T2 satisfies: 0.03mm≤T2≤0.10mm. This configuration ensures that the thickness T2 of the second colloid 52 satisfies the range of 0.03mm≤T2≤0.10m, ensuring that the second colloid 52 seals the gap between the battery housing and the body 1 . If T2 is less than 0.03m, the second colloid 52 is insufficiently filled, and a gap may exist between the fifth sub-surface 32 of the second ring body 12 coated with the second colloid 52 and the battery housing. If T2 is greater than 0.10mm, glue overflow may occur.

[0047] Please refer to Figure 1. The thickness of the first ring body 11 in its radial direction is T3; T3 satisfies: 0.52mm≤T3≤0.65mm. Such a setting can meet the assembly requirements of the main body 1 in the battery shell. If T3 is less than 0.52mm, the strength of the main body 1 will be insufficient; if T3 is greater than 0.65mm, the main body 1 will be too large and difficult to fit into the battery shell. In one embodiment of the present application, when the seal 100 is applied to an 18650 model cylindrical battery, T3 satisfies: 0.52mm≤T3≤0.58mm. Such a setting can meet the assembly requirements of the main body 1 in the battery shell. If T3 is less than 0.52mm, the strength of the main body 1 will be insufficient; if T3 is greater than 0.58mm, the main body 1 will be too large and difficult to fit into the battery shell. In another embodiment of the present application, when the seal 100 is applied to a 21700 model cylindrical battery, T3 satisfies: 0.55mm≤T3≤0.65mm. Such a setting can meet the assembly requirements of the body 1 in the battery shell. If T3 is less than 0.55mm, the strength of the body 1 is insufficient; if T3 is greater than 0.65mm, the body 1 is too large and difficult to fit into the battery shell.

[0048] Please refer to Figure 5. The present application also proposes a battery cap, which includes a seal 100. The seal 100 is as described above. Since the battery cap adopts all the technical solutions of all the above embodiments, it has at least the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

Claims

1. A seal, comprising: A body (1) is arranged in a hollow ring shape, the body (1) comprises a first ring body (11) and a second ring body (12) connected along its axial direction, the first ring body (11) and the second ring body (12) are both arranged in a hollow ring shape, the inner diameter of the first ring body (11) is larger than the inner diameter of the second ring body (12), the second ring body (12) comprises a first surface (2) and a second surface (3), the first surface (2) and the second surface (3) are arranged opposite to each other in the axial direction of the second ring body (12); and, The colloid structure (5) comprises a first colloid (51) and a second colloid (52), wherein the first colloid (51) is arranged on the surface of the body (1), and the second colloid (52) is arranged at a position where the first colloid (51) is located on the first surface (2) and / or the second surface (3).

2. The seal according to claim 1, wherein: The first ring body (11) has a first cavity (11A), and the first ring body (11) includes a third surface (1A), and the third surface (1A) is the inner wall of the first cavity (11A); The first surface (2) comprises a first sub-surface (21) arranged in an annular shape, the first sub-surface (21) is connected to the third surface (1A), and the first sub-surface (21) is provided with the second colloid (52).

3. The seal according to claim 2, wherein: The second colloid (52) disposed on the first sub-surface (21) is arranged in a ring shape, the inner diameter of the second colloid (52) disposed on the first sub-surface (21) is D1, and the inner diameter of the first sub-surface (21) is D2; wherein D1 and D2 satisfy: D1≥D2.

4. The seal according to claim 3, wherein: The D2 also satisfies: D2≥14.4mm.

5. The seal according to claim 3, wherein: The outer diameter of the second colloid (52) disposed on the first sub-surface (21) is D3, and the outer diameter of the first sub-surface (21) is D4; Wherein, D3 and D4 satisfy: D3≤D4.

6. The seal according to claim 5, wherein: The D4 also satisfies: D4≤19.15 mm.

7. The seal according to claim 2, wherein: A protrusion (6) arranged in an annular shape is also formed on the first sub-surface (21), and the height of the protrusion (6) in the axial direction of the second ring body (12) is greater than the thickness of the second colloid (52) in the axial direction of the second ring body (12).

8. The seal according to claim 7, wherein: In the radial direction of the second ring body (12), the second colloid (52) is located between the convex portion (6) and the third surface (1A).

9. The seal according to claim 7, wherein: The height of the protrusion (6) in the axial direction of the second ring body (12) is H, wherein H satisfies: 0.10 mm ≤ H ≤ 0.16 mm.

10. The seal according to claim 9, wherein: The thickness of the second colloid (52) disposed on the first sub-surface (21) in the axial direction of the second ring body (12) is T1; wherein T1 satisfies: 0<T1<0.10mm.

11. The seal according to claim 2, wherein: The weight of the second colloid (52) disposed on the first sub-surface (21) is M; wherein M satisfies: 5 mg≤M≤9 mg.

12. The seal according to claim 2, wherein: The first surface (2) further includes a second sub-surface (22) and a third sub-surface (23); The second sub-surface (22) is arranged in an annular shape and the outer diameter of the second sub-surface (22) is smaller than the inner diameter of the first sub-surface (21); the second sub-surface (22) is located on a side of the first sub-surface (21) that is away from the first ring body (11) in the axial direction of the second ring body (12); The third sub-surface (23) connects the first sub-surface (21) and the second sub-surface (22).

13. The seal according to any one of claims 1 to 12, wherein: The second ring body (12) has a second cavity (12A), and the second ring body (12) further comprises a fourth surface (7) and a fifth surface (8), the fourth surface (7) being the inner wall of the second cavity (12A), and the fifth surface (8) being arranged opposite to the fourth surface (7) in the radial direction of the second ring body (12); The second surface (3) comprises a fourth sub-surface (31) arranged in an annular shape and a fifth sub-surface (32) connecting the fourth sub-surface (31) and the fifth surface (8); The fourth sub-surface (31) is connected to the fourth surface (7), the fifth sub-surface (32) is arranged obliquely in the axial direction of the second ring body (12), and the second colloid (52) is arranged on the fifth sub-surface (32).

14. The seal according to claim 13, wherein: The distance from the connection point between the fifth sub-surface (32) and the fourth sub-surface (31) to the connection point between the fifth sub-surface (32) and the fifth surface (8) is L1, and the length of the second colloid (52) arranged on the fifth sub-surface (32) in the direction from the connection point between the fifth sub-surface (32) and the fourth sub-surface (31) to the connection point between the fifth sub-surface (32) and the fifth surface (8) is L2; ​​wherein L1 and L2 satisfy: 0.7 mm ≤ L2 ≤ L1.

15. The seal according to claim 14, wherein: The L2 also satisfies: L2≤1.8mm.

16. The seal of claim 13, wherein: The second surface (3) further comprises a sixth sub-surface (33) extending axially along the second ring body (12), and the sixth sub-surface (33) connects the fourth sub-surface (31) and the fifth sub-surface (32); In the axial direction of the second ring body (12), the second colloid (52) does not protrude beyond the plane where the fourth sub-surface (31) is located.

17. The seal according to claim 16, wherein: The thickness of the second colloid (52) disposed on the fifth sub-surface (32) in a direction perpendicular to the fifth sub-surface (32) is T2; wherein T2 satisfies: 0.03 mm ≤ T2 ≤ 0.10 mm.

18. The seal according to any one of claims 1 to 17, wherein: The thickness of the first ring body (11) in the radial direction is T3, wherein T3 satisfies: 0.52mm≤T3≤0.65mm.

19. A seal according to any one of claims 1 to 17, wherein: The second colloid (52) is disposed at positions where the first colloid (51) is located on the first surface (2) and the second surface (3); The second colloid (52) located on the first surface (2) and the second colloid (52) located on the second surface (3) are made of the same or different materials.

20. A seal according to any one of claims 1 to 17, wherein: The first colloid (51) is asphalt colloid; and / or, The second colloid (52) is a normal alkane colloid.

21. A battery cap comprising the sealing member according to any one of claims 1 to 20.

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