Seal, battery cover plate and battery

Abstract

The application relates to the battery technical field and discloses a sealing element, a battery cover plate and a battery. The sealing element comprises an inner ring sealing part and an outer ring sealing part; the inner ring sealing part is formed with an inner circumferential straight section and inner circumferential arc sections arranged at both ends of the inner circumferential straight section; the outer ring sealing part surrounds an outer circumference of the inner ring sealing part, the outer ring sealing part is formed with an outer circumferential long side section, outer circumferential short side sections arranged at both ends of the outer circumferential long side section and an outer circumferential transition section arranged between the outer circumferential long side section and the outer circumferential short side sections; the minimum distance between the inner circumferential arc sections and the outer circumferential transition section is J, the distance between the inner circumferential straight section and the outer circumferential long side section is D, the minimum distance between the inner circumferential arc sections and the outer circumferential short side sections is E, and the following conditions are met: J > E and / or J > D. The sealing element provided by the application can provide differential sealing compensation in different shape transition areas after the installation of a non-circular pole, thereby effectively improving the sealing reliability.

Description

Technical Field

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

[0002] Battery covers typically have terminal mounting holes for installing terminals, and sealing structures are provided at the edges of these holes to seal the gap between the terminal and the cover. When the terminal is circular, the gap between the terminal and the cover is more uniform, facilitating effective sealing.

[0003] However, when the structure of the electrode post is not circular, such as when it is racetrack-shaped, the racetrack-shaped electrode post includes a straight section and arc-shaped sections at both ends of the straight section. In this case, the gap between the electrode post and the cover plate is irregular in shape. In particular, the transition area between the straight section and the arc-shaped section is more prone to sealing problems, which can easily lead to sealing failure and safety hazards such as electrolyte leakage or gas escape. Utility Model Content

[0004] In view of this, this application provides a sealing element, a battery cover, and a battery to solve the problem that when the structure of the terminal post is not circular, a local area between the terminal post and the cover is prone to poor sealing.

[0005] In a first aspect, this application provides a sealing element, comprising: The inner ring sealing part and the outer ring sealing part are enclosed to form an inner ring receiving cavity; The inner ring sealing part has an inner circumferential straight section and an inner circumferential arc section located at both ends of the inner circumferential straight section around the edge of the inner ring receiving cavity; The outer ring sealing part is disposed around the outer periphery of the inner ring sealing part. The outer ring sealing part is formed with an outer long side section and an outer short side section disposed at both ends of the outer long side section, and an outer transition section disposed between the outer long side section and the outer short side section, away from the outer periphery of the inner ring sealing part. In the plane perpendicular to the axial direction of the inner ring cavity, the inner circumferential straight segment and the outer circumferential long side segment are parallel to each other, and the distance between the inner circumferential straight segment and the outer circumferential long side segment is D, in mm; In the plane perpendicular to the axial direction of the inner ring cavity, the inner circumferential arc segment is provided in at least part corresponding to the outer circumferential short side segment and the outer circumferential transition segment. The minimum distance between the inner circumferential arc segment and the outer circumferential short side segment is E, in mm; the minimum distance between the inner circumferential arc segment and the outer circumferential transition segment is J, in mm. Satisfy the following conditions: J > E, and / or J > D.

[0006] Beneficial effects: The sealing element of this application, by limiting the minimum distance J between the inner circumferential arc segment and the outer circumferential transition segment to be greater than the minimum distance E between the inner circumferential arc segment and the outer circumferential short side segment, and / or limiting the minimum distance J between the inner circumferential arc segment and the outer circumferential transition segment to be greater than the distance D between the inner circumferential straight segment and the outer circumferential long side segment, enables the sealing element to provide differentiated sealing compensation in different shape transition areas after the installation of non-circular poles, especially racetrack-shaped poles. In particular, it forms a larger sealing contact area in the transition area between the arc segment and the straight segment, thereby effectively improving sealing reliability and avoiding safety hazards such as electrolyte leakage or gas escape caused by uneven gaps.

[0007] Secondly, this application also provides a battery cover, comprising: pole; The cover plate body has pole mounting holes suitable for accommodating poles; And the aforementioned seals that seal between the cover plate body and the pole post.

[0008] Since the battery cover includes a seal and has the same effect as a seal, it will not be elaborated further here.

[0009] Thirdly, this application also provides a battery, comprising: shell; And a battery cover plate as described above is provided on the outer casing, the outer casing and the battery cover plate together form a receiving cavity; The battery cell is housed within a cavity and has tabs that are electrically connected to the terminals of the battery cover.

[0010] Since the battery includes a seal, it has the same effect as a seal, so it will not be elaborated on here. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 This is an exploded view of the battery cover plate of this application; Figure 2 This is a partially enlarged view of the battery cover plate in its disassembled state according to this application; Figure 3 This is a schematic diagram showing the combined state of the pole, seal, and insulation components of this application; Figure 4 This is a schematic diagram showing the disassembled state of the pole, seal, and insulation components of this application; Figure 5 This is a schematic diagram of the seal in this application; Figure 6 This is a top view of the seal in this application; Figure 7 This is a bottom view of the seal in this application; Figure 8 for Figure 7 Schematic diagram of section AA; Figure 9 This is a partial side view of the battery cover of this application; Figure 10 for Figure 9 Schematic diagram of the BB section; Figure 11 This is a partially enlarged view of the cross-sectional state of the battery cover plate of this application.

[0013] Explanation of reference numerals in the attached figures: 1. Cover plate body; 11. Pole post mounting hole; 12. Flanged structure; 121. Extension; 122. Pressing part; 13. Cantilever beam; 2. Pole post; 21. Overlapping part; 22. Pole post protrusion part; 23. Sealing step surface; 3. Sealing element; 31. Axial contact part; 32. Connecting part; 33. Pole post mating part; 34. Guide part; 35. Pole post receiving cavity; 36. Contact surface; 1201, Straight segment of flange; 1202, Curved segment of flange; 311. Long outer perimeter segment; 312. Transitional outer perimeter segment; 313. Short outer perimeter segment; 331. Inner circumference straight segment; 332. Inner circumference arc segment; 4. Insulating components. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0015] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0017] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0018] The following is combined Figures 1 to 11 This describes an embodiment of the present application.

[0019] According to embodiments of this application, in one aspect, a sealing element is provided, comprising: The inner ring sealing part and the outer ring sealing part are enclosed to form an inner ring receiving cavity; The inner ring sealing part has an inner circumferential straight section 331 and an inner circumferential arc-shaped section 332 disposed at both ends of the inner circumferential straight section 331 around the edge of the inner ring receiving cavity; The outer ring sealing portion is disposed around the outer periphery of the inner ring sealing portion. The outer ring sealing portion is formed with an outer periphery long side segment 311 and an outer periphery short side segment 313 disposed at both ends of the outer periphery long side segment 311, and an outer periphery transition segment 312 disposed between the outer periphery long side segment 311 and the outer periphery short side segment 313, away from the outer periphery of the inner ring sealing portion. Combination Figure 6 As shown, in the plane perpendicular to the axial direction of the inner ring cavity, the inner circumferential straight segment 331 and the outer circumferential long side segment 311 are parallel to each other, and the distance between the inner circumferential straight segment 331 and the outer circumferential long side segment 311 is D, in mm. In the plane perpendicular to the axial direction of the inner ring cavity, the inner circumferential arc segment 332 is provided in at least part corresponding to the outer circumferential short side segment 313 and the outer circumferential transition segment 312. The minimum distance between the inner circumferential arc segment 332 and the outer circumferential short side segment 313 is E, in mm; the minimum distance between the inner circumferential arc segment 332 and the outer circumferential transition segment 312 is J, in mm. Satisfy the following conditions: J > E, and / or J > D.

[0020] The sealing element 3 of this application is applied to the battery cover plate, specifically to seal the gap between the terminal post 2 and the cover plate body 1, so as to ensure the airtightness and insulation performance of the battery.

[0021] In this embodiment, the sealing element 3 is assembled on the outer periphery of the electrode post 2. The inner sealing part of the sealing element 3 is in close contact with the peripheral surface of the electrode post 2 so as to form a stable seal with the electrode post 2. The outer sealing part is pressed against the cover plate body 1 and the electrode post 2, thereby achieving reliable sealing of the gap between the cover plate body 1 and the electrode post 2, preventing electrolyte leakage and external gas intrusion.

[0022] Specifically, the cover plate body 1 of this application has a pole mounting hole 11 suitable for accommodating the pole 2. A cantilever beam 13 is formed around the pole mounting hole 11 in the cover plate body 1. The pole 2 includes an overlapping portion 21 suitable for overlapping with the cantilever beam 13. The flange structure 12 is suitable for pressing the overlapping portion 21 onto the cantilever beam 13. Figure 10 , Figure 11 As shown, the outer ring sealing part of the seal 3 is disposed between the overlapping part 21 and the cantilever beam 13. Through the pressing action of the flange structure 12, the outer ring sealing part of the seal 3 is subjected to axial pre-tightening force, thereby generating uniform sealing pressure on the contact surface between the overlapping part 21 and the cantilever beam 13.

[0023] However, in this application, the pole's structural form is non-circular, for example, a monolithic shape. A monolithic shape is a geometric figure composed of a rectangle and two semicircles, resembling a standard running track. This figure consists of a rectangular area in the middle and semicircular ends on both sides, and is collectively referred to as a monolithic shape in the industrial field. Additionally, a monolithic shape can also be called a track shape. The pole 2 with a monolithic structure includes a straight section and arc-shaped sections at both ends of the straight section. In this case, the gap between the pole and the cover plate is irregular in shape. The axial force applied by the flange structure 12 during the flange process is unevenly distributed on the outer sealing part of the seal, resulting in local stress concentration or insufficient sealing. When using a traditional seal that matches the cross-sectional profile of the pole 2, it is easy to cause the seal to be difficult to fit evenly, especially in the transition area between the straight section and the arc section, where poor sealing is more likely to occur, thus affecting the reliability of the seal.

[0024] To address the aforementioned issues, this application designs the outer ring sealing portion of the seal 3 with a structure featuring differentiated spacing. By setting J > E and / or J > D, a larger sealing contact area is maintained between the outer peripheral transition section 312 and the inner peripheral arc-shaped section 332. This allows the seal 3 to have greater deformation compensation space during the pressing process of the flange structure 12, enabling the outer ring sealing portion to maintain good sealing performance in the transition area between the straight and arc-shaped sections of the non-circular pole. This avoids local sealing failure caused by uneven stress distribution and effectively improves the seal's adaptability to complex contours.

[0025] Combination Figure 6 As shown, the minimum distance J between the inner circumferential arc segment 332 and the outer circumferential transition segment 312 is greater than the minimum distance E between the inner circumferential arc segment 332 and the outer circumferential short side segment 313, thereby increasing the material redundancy in the transition area and making the seal more prone to local plastic deformation under external force to compensate for contour differences. Similarly, the minimum distance J is also greater than the minimum distance D between the inner circumferential straight segment 331 and the outer circumferential long side segment 311, so that the seal 3 can still maintain sufficient sealing contact pressure in the connection area between the arc segment and the straight segment of the non-circular pole.

[0026] In some embodiments, E≥D is satisfied.

[0027] The flange structure 12 of this application has a clearance state for the insertion of the pole post 2 into the pole post mounting hole 11, and a riveting state for riveting and fixing the pole post 2. The flange structure 12 can switch from the clearance state to the riveting state under the riveting pressure of the riveting equipment. At this time, the flange structure 12 undergoes plastic deformation in the radial direction, pressing the outer ring sealing part of the sealing element 3. During the riveting process, the inner wall of the flange structure 12 gradually conforms to the circumferential outline of the pole post 2. However, since the flange structure 12 matches the outer outline of the pole post 2, it also has a straight section and an arc section. The riveting equipment applies a relatively uniform force to the straight section, making the sealing element in the straight section area stable. However, the arc section causes stress concentration due to the curvature change, which makes the metal material prone to uneven flow during plastic deformation, easily causing insufficient local deformation or excessive compression. This results in a local gradient difference in the pressure applied to the sealing element, thereby affecting the uniformity of the sealing performance.

[0028] This application makes the minimum distance E between the inner circumferential arc segment 332 and the outer circumferential short side segment 313 greater than or equal to the distance D between the inner circumferential straight segment 331 and the outer circumferential long side segment 311. This allows for the retention of appropriate compression in the straight segment area while further increasing the material redundancy of the arc segment, thereby improving the deformation adaptability of the arc segment area during the riveting process. This enables the seal 3 to have a better sealing effect in both the arc segment and the straight segment.

[0029] In some embodiments, combined with Figure 6As shown, the radius of the inner circumferential arc segment 332 is R1, in mm; the radius of the outer circumferential transition segment 312 is R2, in mm; satisfying: R2>R1.

[0030] By making the radius R2 of the outer peripheral transition section 312 larger than the radius R1 of the inner peripheral arc section 332, the curvature change of the outer peripheral transition section 312 can be made more gradual, thereby effectively dispersing the stress borne by the axial abutment part 31 during the riveting process, reducing the risk of local stress concentration, and improving the sealing effect.

[0031] In some embodiments, the following condition is satisfied: 0.75≤R1 / R2≤0.95.

[0032] By limiting the upper limit of the ratio of the radius R1 of the inner circumferential arc segment 332 to the radius R2 of the outer circumferential transition segment 312, the risk of structural interference caused by excessively large R1 or excessively small R2 can be effectively suppressed, while ensuring the fitting accuracy between the pole mating part 33 and the sealing step surface 23. Furthermore, by limiting the lower limit of the R1 / R2 ratio, material redundancy of the sealing element 3 caused by excessively small R1 or excessively large R2 can be avoided.

[0033] For example, in this embodiment, the value of R1 / R2 can be 0.75, 0.8, 0.85, 0.9, or 0.95, or it can be any range formed by any two of the above values.

[0034] According to an embodiment of this application, another aspect provides a battery cover, comprising: pole 2; The cover plate body 1 has an electrode mounting hole 11 suitable for accommodating the electrode post 2; And the sealing element 3 as described above, which is sealed between the cover plate body 1 and the pole post 2.

[0035] The battery cover of this application, by placing the aforementioned sealing element 3 between the cover body 1 and the terminal post 2, forms a stable and reliable sealing connection between the sealing element 3 and the terminal post 2 and the cover body 1, effectively preventing electrolyte leakage and the intrusion of external contaminants. Specifically, it maintains a larger sealing contact area between the outer peripheral transition section 312 and the inner peripheral arc-shaped section 332 of the sealing element 3, thereby allowing the sealing element 3 to have a larger deformation compensation space during the pressing process of the flange structure 12. This ensures that the outer sealing part can maintain good sealing performance in the transition area between the straight and arc-shaped sections of the non-circular terminal post, avoiding local sealing failure caused by uneven stress distribution, and effectively improving the adaptability of the sealing element under complex contours.

[0036] In some embodiments, the seal is adapted to be sealed between the pole post 2 and the cover plate body 1. The cover plate body 1 has a pole post mounting hole 11 adapted to accommodate the pole post 2. A cantilever beam 13 is formed around the pole post mounting hole 11. The pole post 2 includes a pole post protrusion 22 that at least partially passes through the pole post mounting hole 11, and an overlap portion 21 adapted to overlap with the cantilever beam 13. A sealing step surface 23 is formed between the overlap portion 21 and the pole post protrusion 22.

[0037] The inner ring sealing part includes a pole mating part 33 adapted to fit against the sealing step surface 23.

[0038] The outer ring sealing part includes an axial abutting part 31 that abuts against the cantilever beam 13 and the overlapping part 21; the axial abutting part 31 and the pole post mating part 33 are connected via a connecting part 32.

[0039] As a specific implementation, the inner ring sealing part includes a pole mating part 33 adapted to fit with the sealing step surface 23, and the inner circumferential contour of the pole mating part 33 is adapted to the outer shape of the sealing step surface 23 to achieve full circumferential fit.

[0040] The outer ring sealing part includes an axial abutting part 31 that abuts against the cantilever beam 13 and the overlapping part 21. The axial abutting part 31 undergoes axial compression deformation under riveting action, thereby forming a stable sealing pre-tightening force between the cantilever beam 13 and the overlapping part 21.

[0041] The axial abutment portion 31 and the pole post mating portion 33 are connected by a connecting portion 32. The connecting portion 32 is used to adapt to the spatial layout between the sealing step surface 23 and the cantilever beam 13, ensuring that the axial abutment portion 31 and the pole post mating portion 33 do not interfere with each other after being subjected to force, and maintain the independence of their respective sealing functions.

[0042] Combination Figure 5 As shown, the thickness of the connecting part 32 is less than the thickness of the axial abutment part 31 and the pole mating part 33, so as to reduce the rigidity of the connecting area, improve the flexibility, and prevent the axial abutment part 31 from deforming due to force during the riveting process, which would cause the pole mating part 33 to twist or warp, thus ensuring that the two fit together independently.

[0043] In some embodiments, the side of the seal facing the overlap 21 forms an abutment surface 36, which is adapted to fit against the surface of the overlap 21.

[0044] A guide portion 34 is formed at the corner between the contact surface 36 and the pole mating portion 33.

[0045] By forming a guide portion 34 at the corner between the contact surface 36 and the pole mating portion 33, the seal 3 and the pole 2 are assembled, thereby playing a guiding and positioning role, reducing installation resistance, and avoiding tearing or folding caused by concentrated force on the edge of the seal 3.

[0046] Optionally, the guide section 34 may adopt a chamfered transition structure or a rounded transition structure.

[0047] In some embodiments, a cantilever beam 13 is formed around the pole mounting hole 11 of the cover plate body 1, and a flange structure 12 is formed on one side surface of the cover plate body 1, the flange structure 12 being formed on the outer periphery of the cantilever beam 13 away from the pole mounting hole 11. The pole post 2 includes an overlap portion 21 adapted to overlap with the cantilever beam 13, and the flange structure 12 is adapted to press the overlap portion 21 onto the cantilever beam 13. The seal 3 is at least partially disposed between the overlap 21 and the cantilever beam 13.

[0048] In some embodiments, the flange structure 12 includes an extension 121 and a pressing portion 122. The extension 121 extends outward from one side surface of the cover plate body 1, and the pressing portion 122 is formed by bending from the end of the extension 121 toward the cantilever beam 13. The extension 121 has a flanged straight section 1201 and flanged arc sections 1202 provided on both sides of the flanged straight section 1201 on one side of the cantilever beam 13. The straight flange segment 1201 is parallel to the long outer perimeter segment 311, and the curved flange segment 1202 is simultaneously set to correspond to the short outer perimeter segment 313 and the transition segment 312.

[0049] Combination Figure 10 As shown, the outer contour of the extension 121 of the flange structure 12 in this application is adapted to the outer periphery contour of the pole post 2.

[0050] In some embodiments, the length of the flange straight segment 1201 is G, in mm; the length of the outer perimeter long side segment 311 is F2, in mm; satisfying: G≤F2.

[0051] By making the length F2 of the outer perimeter long side segment 311 greater than the length G of the flange straight segment 1201, the starting point of the outer perimeter transition segment 312 and the starting point of the flange arc segment 1202 can be kept at a certain offset in the radial direction, thereby effectively increasing the sealing area of ​​the seal 3 in the area enclosed by the extension 121, and thus improving the sealing reliability.

[0052] In some embodiments, the length of the flange straight segment 1201 is G, in mm; the length of the inner circumference straight segment 331 is F1, in mm; satisfying: F1=G.

[0053] In some embodiments, the center of the flanged arc segment 1202 coincides with the center of the inner circumferential arc segment 332.

[0054] By making the length F1 of the inner circumferential straight segment 331 equal to the length G of the flange straight segment 1201, and by making the center of the flange arc segment 1202 coincide with the center of the inner circumferential arc segment 332, it can be ensured that the outer contour of the pole post 2 matches that of the extension 121.

[0055] In some embodiments, the radius of the flange arc segment 1202 is T, in mm; the radius of the inner circumferential arc segment 332 is R1, in mm; satisfying: T-R1≥J.

[0056] In this application, T-R1 represents the radial gap between the flanged arc segment 1202 and the inner circumferential arc segment 332. This gap needs to be greater than the minimum distance J between the inner circumferential arc segment 332 and the outer circumferential transition segment 312 in order to avoid structural interference, ensure that the seal 3 can be installed smoothly and maintain the preset compression amount, thereby effectively performing the sealing function.

[0057] According to embodiments of this application, in another aspect, a battery is also provided, comprising: shell; And a battery cover plate as described above is provided on the outer casing, the outer casing and the battery cover plate together form a receiving cavity; The battery cell is housed within the cavity and has tabs that are electrically connected to the terminals 2 of the battery cover.

[0058] By employing the aforementioned battery cover, the battery of this application can effectively improve the sealing reliability of the terminal area, prevent electrolyte leakage and external impurities from entering, thereby improving the battery's safety and cycle life.

[0059] In this application, the tabs of the battery cell are electrically connected to the terminals 2 of the battery cover. Specifically, the tabs can be connected to the terminals 2 via an adapter piece, or the tabs can be directly welded to the terminals. When an adapter piece is used, the tabs and terminals are welded to the adapter piece respectively.

[0060] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by this application.

Claims

1. A sealing element, characterized in that, include: An inner ring sealing portion and an outer ring sealing portion, wherein the inner ring sealing portion encloses and forms an inner ring receiving cavity; The inner ring sealing portion has an inner circumferential straight section (331) and an inner circumferential arc section (332) disposed at both ends of the inner circumferential straight section (331) around the edge of the inner ring receiving cavity. The outer ring sealing portion is disposed around the outer periphery of the inner ring sealing portion. The outer ring sealing portion is formed with an outer long side segment (311) and an outer short side segment (313) disposed at both ends of the outer long side segment (311) and an outer transition section (312) disposed between the outer long side segment (311) and the outer short side segment (313). In the plane perpendicular to the axial direction of the inner ring cavity, the inner circumferential straight segment (331) and the outer circumferential long side segment (311) are parallel to each other, and the distance between the inner circumferential straight segment (331) and the outer circumferential long side segment (311) is D, in mm; In a plane perpendicular to the axial direction of the inner ring cavity, the inner circumferential arc segment (332) is provided in at least a portion corresponding to the outer circumferential short side segment (313) and the outer circumferential transition segment (312). The minimum distance between the inner circumferential arc segment (332) and the outer circumferential short side segment (313) is E, in mm; the minimum distance between the inner circumferential arc segment (332) and the outer circumferential transition segment (312) is J, in mm. Satisfy the following conditions: J > E, and / or J > D.

2. The seal according to claim 1, characterized in that, Satisfies: E≥D.

3. The seal according to claim 1, characterized in that, The radius of the inner circumferential arc segment (332) is R1, in mm; the radius of the outer circumferential transition segment (312) is R2, in mm; satisfying: R2 > R1.

4. The seal according to claim 3, characterized in that, It satisfies: 0.75≤R1 / R2≤0.

95.

5. A battery cover, characterized in that, include: pole (2); The cover plate body (1) has an electrode mounting hole (11) suitable for accommodating the electrode post (2). And a seal (3) as described in any one of claims 1 to 4, which is sealed between the cover plate body (1) and the pole post (2).

6. The battery cover according to claim 5, characterized in that, The cover plate body (1) has a cantilever beam (13) formed around the pole mounting hole (11); the pole (2) includes a pole protrusion (22) that at least partially passes through the pole mounting hole (11), and an overlap portion (21) adapted to overlap with the cantilever beam (13), and a sealing step surface (23) is formed between the overlap portion (21) and the pole protrusion (22). The inner ring sealing portion includes a pole fitting portion (33) adapted to fit against the sealing step surface (23); The outer ring sealing part includes an axial abutment part (31) that abuts against the cantilever beam (13) and the overlapping part (21); the axial abutment part (31) and the pole fitting part (33) are connected via a connecting part (32).

7. The battery cover according to claim 6, characterized in that, The sealing element forms an abutment surface (36) on the side facing the overlapping portion (21), and the abutment surface (36) is adapted to fit against the surface of the overlapping portion (21); A guide portion (34) is formed at the corner between the contact surface (36) and the pole mating portion (33).

8. The battery cover according to claim 5, characterized in that, The cover plate body (1) has a cantilever beam (13) formed around the pole mounting hole (11), and a flange structure (12) extends from one side surface of the cover plate body (1), the flange structure (12) being formed on the outer periphery of the cantilever beam (13) away from the pole mounting hole (11). The pole post (2) includes an overlap portion (21) adapted to overlap with the cantilever beam (13), and the flange structure (12) is adapted to press the overlap portion (21) onto the cantilever beam (13); The seal (3) is at least partially disposed between the overlap (21) and the cantilever beam (13).

9. The battery cover according to claim 8, characterized in that, The flange structure (12) includes an extension (121) and a pressing part (122). The extension (121) extends outward from one side surface of the cover plate body (1), and the pressing part (122) is bent from the end of the extension (121) toward the cantilever beam (13). The extension (121) has a flanged straight section (1201) and flanged arc sections (1202) on the side surface facing the cantilever beam (13). The straight flange segment (1201) is parallel to the long outer perimeter segment (311), and the curved flange segment (1202) is simultaneously provided in correspondence with the short outer perimeter segment (313) and the transition segment (312).

10. The battery cover according to claim 9, characterized in that, The length of the flange straight segment (1201) is G, in mm; the length of the outer perimeter long side segment (311) is F2, in mm; satisfying: G≤F2.

11. The battery cover according to claim 9, characterized in that, The length of the flange straight segment (1201) is G, in mm; the length of the inner circumference straight segment (331) is F1, in mm; satisfying: F1=G.

12. The battery cover according to claim 9, characterized in that, The radius of the flanged arc segment (1202) is T, in mm; the radius of the inner circumferential arc segment (332) is R1, in mm; satisfying: T-R1≥J.

13. The battery cover according to claim 9, characterized in that, The center of the flanged arc segment (1202) coincides with the center of the inner circumferential arc segment (332).

14. A battery, characterized in that, include: shell; And a battery cover as described in any one of claims 5 to 13, which is disposed on the outer casing, the outer casing and the battery cover forming a receiving cavity; A battery cell is disposed in the cavity, and the battery cell has tabs that are electrically connected to the terminals (2) of the battery cover.

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