Double-sealed battery cover plate

Abstract

A double-sealed battery cover plate, comprising: a top cover plate, the top cover plate being provided with a terminal post hole, and a plurality of annular ribs being provided on the periphery of the terminal post hole; an electrode post, the electrode post passing through the terminal post hole, and a fixing groove being provided on a peripheral wall of the electrode post; a nano-injection-molded plastic member, the nano-injection-molded plastic member being snapped into a gap between the peripheral wall of the electrode post and the top cover plate, a plurality of inverted snap grooves being provided on the nano-injection-molded plastic member, and the inverted snap grooves being sleeved on corresponding annular ribs; and a sealing ring, the sealing ring being snapped into a gap between the fixing groove and the top cover plate, and a first end of the sealing ring being inserted into the fixing groove.

Description

A double-sealed battery cover

[0001] This application claims priority to Chinese Patent Application No. 202422097842.5, filed on August 28, 2024, which is incorporated herein by reference in its entirety. Technical Field

[0002] According to various embodiments of this application, a double-sealed battery cover is provided. Background Technology

[0003] With the rapid development of technology, batteries, as a key component for energy storage and conversion, are increasingly widely used in various fields, including but not limited to portable electronic devices, electric vehicles, energy storage systems, and aerospace. In these applications, battery performance and safety are paramount, and the sealing performance of the battery cover is one of the factors affecting battery performance and safety.

[0004] Traditional battery cover designs often employ a single sealing method, such as directly sealing the battery casing and cover with materials like rubber gaskets or adhesives. However, this single sealing method often fails to guarantee its sealing effect under complex and changing external environments, such as high temperature, high humidity, and vibration. This can easily lead to problems such as internal gas leakage, electrolyte seepage, or the intrusion of external moisture and dust, thereby affecting the battery's lifespan and safety performance.

[0005] To overcome the shortcomings of the aforementioned single sealing method, dual-sealing technology has been proposed. Dual-sealing technology adds one or more sealing structures to form multiple barriers, effectively improving the sealing performance of the battery cover. However, existing dual-sealing battery cover designs often suffer from complex structures, high manufacturing costs, and unstable sealing effects, limiting their widespread adoption in practical applications.

[0006] To address at least one of the aforementioned problems, this disclosure proposes a double-sealed battery cover.

[0007] Summary of the Invention

[0008] The purpose of this disclosure is to provide a double-sealed battery cover, which employs a double-sealing mechanism to improve the sealing performance and service life of the battery cover.

[0009] The purpose of this disclosure is achieved through the following technical solution:

[0010] This disclosure provides a double-sealed battery cover, comprising:

[0011] A top cover plate, wherein an pole post hole is provided on the top cover plate, and an annular rib is provided on the outer periphery of the pole post hole;

[0012] An electrode post, which passes through the electrode post hole, has a fixing groove on its peripheral wall;

[0013] A dual-sealing assembly, comprising:

[0014] A nano-injection molded plastic part is inserted into the gap between the peripheral wall of the electrode post and the top cover plate. The nano-injection molded plastic part is provided with an undercut groove, which is fitted onto the annular rib.

[0015] A sealing ring is inserted into the gap between the fixing groove and the top cover plate, with the first end of the sealing ring embedded in the fixing groove.

[0016] In one or more embodiments, the inner surface of the pole hole is provided with a limiting step;

[0017] The peripheral wall of the electrode post is provided with a clearance step;

[0018] The nano-injection molded plastic part is inserted into the gap between the limiting step and the avoidance step.

[0019] In one or more embodiments, the inner surface of the nano-injection molded plastic part is provided with a first protrusion structure, the first protrusion structure abutting against the upper side of the avoidance step and the surface layer of the avoidance step;

[0020] The bottom of the nano-injection molded plastic part is provided with a second protrusion structure. The first side of the second protrusion structure abuts against the lower side of the avoidance step, the second side of the second protrusion structure abuts against the upper side of the limiting step, and the third side of the second protrusion structure abuts against the second end of the sealing ring opposite to the first end.

[0021] The first side of the second protrusion structure is disposed opposite to its second side, and the first side of the second protrusion structure is disposed perpendicular to its third side.

[0022] In one or more embodiments, the sealing ring is inserted into the gap between the fixing groove and the limiting step, and the second end of the sealing ring opposite to the first end abuts against the upper side of the limiting step.

[0023] In one or more embodiments, the first end of the sealing ring is provided with a third protrusion structure;

[0024] The fixing groove includes a first groove and a second groove that communicate with each other;

[0025] The opening of the first groove faces the limiting step. The first groove accommodates the first end of the sealing ring. A through hole is opened on the groove wall of the first groove. The through hole is reused as the opening of the second groove. The second groove accommodates the third protrusion structure.

[0026] In one or more embodiments, the angle between the annular rib and the top cover plate is 0-180°.

[0027] In one or more embodiments, the longitudinal section of the annular rib includes a bottom edge, a first side edge, a top edge, and a second side edge connected in sequence;

[0028] The length of the bottom edge is greater than the length of the top edge;

[0029] The included angle between the first side and the upper surface of the top cover plate is greater than 0° and less than 90°;

[0030] The angle between the second side and the upper surface of the top cover plate is greater than 90° and less than 180°.

[0031] In one or more embodiments, the longitudinal section of the annular rib includes a bottom edge, a first side edge, a top edge, and a second side edge connected in sequence;

[0032] The first side is parallel to the second side;

[0033] The included angle between the first side and the upper surface of the top cover plate is greater than 0° and less than 90°;

[0034] The angle between the second side and the upper surface of the top cover plate is complementary to the angle between the first side and the upper surface of the top cover plate.

[0035] In one or more embodiments, the longitudinal section of the annular rib includes a bottom edge, a first side edge, a top edge, and a second side edge connected in sequence;

[0036] The first side is parallel to the second side;

[0037] The angle between the first side and the upper surface of the top cover plate is greater than 90° and less than 180°;

[0038] The angle between the second side and the upper surface of the top cover plate is complementary to the angle between the first side and the upper surface of the top cover plate.

[0039] In one or more embodiments, the undercut groove is an annular groove with a ring-shaped structure.

[0040] In one or more embodiments, the nano-injection molded plastic part is an injection molded part.

[0041] In one or more embodiments, the top cover plate is provided with explosion-proof holes;

[0042] The double-sealed battery cover also includes:

[0043] An explosion-proof valve assembly is provided, wherein the explosion-proof valve assembly is disposed in the explosion-proof hole, and a sealing structure is provided in the gap between the explosion-proof hole and the explosion-proof valve assembly.

[0044] In one or more embodiments, the top cover plate has a sealable injection hole.

[0045] In one or more embodiments, the included angle between the first side and the upper surface of the top cover plate is greater than 0° and less than 60°;

[0046] The angle between the second side and the upper surface of the top cover plate is greater than 120° and less than 180°.

[0047] In one or more embodiments, the angle between the first side and the upper surface of the top cover plate is greater than 0° and less than 60°.

[0048] In one or more embodiments, the angle between the first side and the upper surface of the top cover plate is greater than 120° and less than 180°.

[0049] In one or more embodiments, the fixing groove is an annular groove with a ring structure;

[0050] The first protrusion structure, the second protrusion structure, and the third protrusion structure are all annular protrusion structures.

[0051] The beneficial effects of this disclosure include at least the following:

[0052] This disclosure not only fully utilizes the high sealing and bonding characteristics of nano-injection molded plastic parts, but also significantly improves the sealing performance by adopting a dual-sealing assembly mechanism using sealing rings and nano-injection molded plastic parts. This effectively prevents the penetration of gas, liquid or solid particles, ensures the stability and safety of the battery's internal environment, and extends the product's service life to more than 20 years.

[0053] By setting an annular rib and an undercut groove around the periphery of the electrode post hole to achieve an undercut structure, the overall structural strength of the top cover plate is enhanced, effectively resisting external stress and internal pressure, preventing deformation or cracking of the top cover plate, improving the connection strength between the top cover plate and other components (e.g., electrode posts, nano-injection molded plastic parts, sealing rings), and improving the aesthetics of the external structure.

[0054] The first end of the sealing ring is embedded in the fixing groove, which improves the stability and sealing performance of the first layer of sealing mechanism and ensures that the battery cover can maintain a good sealing state even under vibration or impact conditions. Attached Figure Description

[0055] Figure 1 is a schematic diagram of a double-sealed battery cover according to an embodiment of the present disclosure.

[0056] Figure 2 is a schematic diagram of another structure of the double-sealed battery cover according to an embodiment of the present disclosure.

[0057] Figure 3 is a structural schematic diagram of an enlarged view of A in Figure 2 of this disclosure.

[0058] Figure 4 is a structural schematic diagram of another enlarged view of A in Figure 2 of this disclosure embodiment.

[0059] Figure 5 is a structural schematic diagram of another enlarged view of A in Figure 2 of this disclosure embodiment.

[0060] In the diagram: 1. Top cover plate; 11. Electrode post hole; 12. Annular rib; 120. Longitudinal section of the annular rib; 121. Bottom edge; 122. First side edge; 123. Top edge; 124. Second side edge; 13. Limiting step; 131. Upper side of the limiting step; 14. Explosion-proof hole; 2. Electrode post; 21. Clearance step; 211. Upper side of the clearance step; 212. Surface layer of the clearance step; 213. Lower side of the clearance step; 22. Fixing groove; 221. First groove; 2211. First groove 2212, through hole; 2213, opening of the first groove; 222, second groove; 2221, opening of the second groove; 3, double sealing assembly; 31, nano-injection molded plastic part; 311, undercut groove; 312, first protrusion structure; 313, second protrusion structure; 3131, first side; 3132, second side; 3133, third side; 32, sealing ring; 321, third protrusion structure; 322, first end; 323, second end; 5, explosion-proof valve assembly; 6, sealable injection hole. Detailed Implementation

[0061] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided to make this disclosure more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0062] The terms used to describe position and direction in this disclosure are illustrated with the accompanying drawings, but may be changed as needed, and all such changes are included within the scope of protection of this disclosure.

[0063] This disclosure describes a double-sealed battery cover.

[0064] To improve the sealing performance of the battery cover, referring to Figures 1 and 2, the battery cover of this disclosure includes: a top cover plate 1, electrode posts 2, and a double sealing assembly 3. Furthermore, to provide additional safety for the battery, referring to Figure 1, the battery cover may also include: an explosion-proof valve assembly 5. When the internal pressure of the battery abnormally increases, the explosion-proof valve assembly 5 can be opened to release the pressure and prevent the battery from exploding. Furthermore, to improve the production efficiency and safety of the battery, referring to Figure 1, the battery cover may also include: a sealable electrolyte injection port 6. The sealable electrolyte injection port 6 allows for convenient injection of electrolyte during battery production and prevents electrolyte leakage through sealing measures after injection.

[0065] The dual-sealing assembly 3 of this disclosure may include a nano-injection molded plastic part 31 and a sealing ring 32; it may also include two nano-injection molded plastic parts 31 or two sealing rings 32; or it may be two other layers of components that can play a sealing role, thereby improving the sealing performance of the battery cover, effectively preventing the penetration of gas, liquid or solid particles, ensuring the stability and safety of the internal environment of the battery, and improving the service life of the product. The top cover 1 of this disclosure has terminal hole 11, explosion-proof hole 14 and sealable liquid injection hole 6. In application, the top cover 1 is made of aluminum alloy or stainless steel, providing structural support and protection for the entire battery cover. In practical applications, the top cover 1 can be round or square. When the top cover 1 is square, it can be used for various square batteries, with a compact structure that is easy to install and fix; when the top cover 1 is round, it can be used for round or cylindrical batteries, and also has the characteristics of stable structure and easy integration. It should be noted that the top cover 1 of this disclosure is not limited to these two shapes, but can be adapted to top cover 1 with various shape characteristics.

[0066] The explosion-proof valve assembly 5 of this disclosure is disposed in the explosion-proof hole 14, and a sealing structure is provided in the gap between the explosion-proof hole 14 and the explosion-proof valve assembly 5. The electrode post 2 of this disclosure serves as the connection point between the battery and the external circuit. The electrode post 2 is manufactured through processes such as stamping, machining, or cold forging to ensure its accuracy and durability. In application, the electrode post 2 is inserted into the electrode post hole 11. Although the illustrated embodiment shows two electrode posts 2, one positive and one negative, both disposed on the top cover plate 1, in other embodiments, only one positive or negative electrode post 2 may be disposed on the top cover plate 1, which does not affect the implementation of this disclosure. Since this disclosure does not involve the polarity distinction of the positive and negative electrode posts 2, the polarity of the electrode posts 2 will not be described further.

[0067] The inner surface of the pole post hole 11 disclosed herein is provided with a limiting step 13. The limiting step 13 includes a limiting step upper side 131, a limiting step surface layer (not shown), and a limiting step lower side (not shown) connected sequentially. Furthermore, referring to FIG3, the outer periphery of the pole post hole 11 is provided with annular ribs 12. The annular ribs 12 are arranged in a ring shape, which enhances the rigidity and structural stability of the top cover plate 1, and also provides a better snap-fit ​​surface for the nano-injection molded plastic part 31, helping to achieve a tighter connection and seal. Further, the longitudinal section 120 of each annular rib is circular, elliptical, square, rhomboid, parallelogram, inverted trapezoid, or irregular in shape. In application, those skilled in the art can also set the longitudinal section 120 of the annular rib to other shapes according to actual conditions. In addition, the included angle between the annular rib and the top cover plate is 0-180°. In one or more embodiments, the included angle between the annular rib and the top cover plate is an obtuse angle or an acute angle. In one or more embodiments, the angle between the annular rib and the top cover plate is 0–45°, or the angle between the annular rib and the top cover plate is 135–180°. This results in better stability and sealing of the undercut structure formed by the annular rib 12 and the undercut groove 311.

[0068] Referring to Figure 5, in one or more embodiments, the longitudinal section 120 of the annular rib includes a bottom edge 121, a first side edge 122, a top edge 123, and a second side edge 124 connected in sequence, and the length of the bottom edge 121 is greater than the length of the top edge 123, for example, an inverted trapezoid. In this case, the angle between the first side edge 122 and the upper surface of the top cover plate 1 is greater than 0° and less than 90°. In one or more embodiments, the angle between the first side edge 122 and the upper surface of the top cover plate 1 is greater than 0° and less than 60°. The angle between the second side edge 124 and the upper surface of the top cover plate 1 is greater than 90° and less than 180°. In one or more embodiments, the angle between the second side edge 124 and the upper surface of the top cover plate 1 is greater than 120° and less than 180°.

[0069] Referring to Figure 3, in one or more embodiments, the longitudinal section 120 of the annular rib includes a bottom edge 121, a first side edge 122, a top edge 123, and a second side edge 124 connected in sequence, with the first side edge 122 and the second side edge 124 being parallel, for example, a parallelogram. In this case, the angle between the first side edge 122 and the upper surface of the top cover plate 1 is greater than 0° and less than 90°. In one or more embodiments, the angle between the first side edge 122 and the upper surface of the top cover plate 1 is greater than 0° and less than 60°. The angle between the second side edge 124 and the upper surface of the top cover plate 1 is complementary to the angle between the first side edge 122 and the upper surface of the top cover plate 1.

[0070] Referring to Figure 4, in one or more embodiments, the longitudinal section 120 of the annular rib includes a bottom edge 121, a first side edge 122, a top edge 123, and a second side edge 124 connected in sequence, with the first side edge 122 and the second side edge 124 being parallel, for example, a parallelogram. In this case, the angle between the first side edge 122 and the upper surface of the top cover plate 1 is greater than 90° and less than 180°. In one or more embodiments, the angle between the first side edge 122 and the upper surface of the top cover plate 1 is greater than 120° and less than 180°; the angle between the second side edge 124 and the upper surface of the top cover plate 1 is complementary to the angle between the first side edge 122 and the upper surface of the top cover plate 1.

[0071] The electrode post 2 of this disclosure has a clearance step 21 on its peripheral wall. The clearance step 21 includes an upper side surface 211, a surface layer 212, and a lower side surface 213 connected in sequence. In addition, a fixing groove 22 is also formed on the peripheral wall of the electrode post 2. Further, the fixing groove 22 includes a first groove 221 and a second groove 222 that are in communication; the groove opening 2213 of the first groove faces the limiting step 13, and a through hole 2212 is formed on the groove wall 2211 of the first groove, which is reused as the groove opening 2221 of the second groove.

[0072] The disclosed nano-injection molded plastic part 31 is inserted into the gap between the peripheral wall of the electrode post 2 and the top cover plate 1. In application, the nano-injection molded plastic part 31 is inserted into the gap between the limiting step 13 and the clearance step 21. It can be seen that the limiting step 13 on the inner surface of the electrode post hole 11 cooperates with the clearance step 21 on the peripheral wall of the electrode post 2, providing a clearer installation position or injection position for the nano-injection molded plastic part 31 and a better fixing effect, further enhancing the sealing performance and structural stability of the battery cover plate.

[0073] Furthermore, the nano-injection molded plastic part 31 of this disclosure is provided with a plurality of undercut grooves 311 adapted to the annular rib position 12. The undercut groove 311 is an annular groove with an annular structure. Moreover, those skilled in the art can set the opening of the undercut groove 311 to be circular, elliptical, square, rhomboid, parallelogram, irregular or other shapes according to the annular rib position 12 of different sizes and shapes, so as to improve the flexibility and applicability of this disclosure.

[0074] The inner surface of the nano-injection molded plastic part 31 disclosed herein is provided with a first protrusion structure 312. The first protrusion structure 312 abuts against the upper side surface 211 of the avoidance step and the surface layer 212 of the avoidance step, thereby enhancing the connection tightness between the nano-injection molded plastic part 31 and the electrode post 2. In addition, the bottom of the nano-injection molded plastic part 31 is provided with a second protrusion structure 313. Further, the second protrusion structure 313 has a hexahedral structure, including a first side 3131 and a second side 3132 arranged opposite to each other, and a first side 3131 and a third side 3133 that are perpendicular to each other and connected. In application, the first side 3131 of the second protrusion structure 313 abuts against the lower side surface 213 of the avoidance step, the second side 3132 of the second protrusion structure 313 abuts against the upper side surface 131 of the limiting step, and the third side 3133 of the second protrusion structure 313 abuts against the second end of the sealing ring 32 opposite to the first end. The second protruding structure 313 of this disclosure abuts against and avoids the step 21 and the limiting step 13, as well as the second end of the sealing ring 32 from multiple directions. This not only improves the stability and sealing of the overall structure, but also ensures that the battery cover can maintain a good sealing state even under vibration or impact conditions.

[0075] The sealing ring 32 disclosed herein is made of a material with good elasticity and corrosion resistance. In application, the sealing ring 32 is inserted into the gap between the fixing groove 22 and the top cover plate 1. Further, the sealing ring 32 is inserted into the gap between the fixing groove 22 and the limiting step 13, with the first end 322 of the sealing ring 32 embedded in the fixing groove 22. Even further, the sealing ring 32 includes a first end 322 and a second end 323 disposed opposite to each other, and the first end 322 of the sealing ring 32 is provided with a third protrusion structure 321. In application, the second end 323 of the sealing ring 32 abuts against the upper side surface 131 of the limiting step, the first end 322 is inserted into the first groove 221, and the third protrusion structure 321 is inserted into the second groove 222, enhancing the sealing effect of the sealing ring 32 and preventing the penetration of gas and liquid. It is worth noting that the third protrusion structure 321 cooperates with the first groove 221 and the second groove 222 in the fixing groove 22. In particular, the through hole 2212 in the first groove enables the sealing ring 32 to be more firmly fixed on the electrode post 2, thereby improving the anti-pull-out ability and sealing performance of the sealing ring 32.

[0076] In one or more embodiments, the fixing groove 22 is an annular groove with a ring structure. Furthermore, the first protrusion structure 312, the second protrusion structure 313, and the third protrusion structure 321 are all annular protrusion structures, which can effectively improve the sealing effect. In one or more embodiments, the nano-injection molded plastic part 31 of this disclosure is an injection molded part. For example, it can be nano-injection molded from one or more high-performance plastics such as polyphenylene sulfide, liquid crystal polymer, polyetheretherketone, polybutylene terephthalate, and polyimide. The obtained nano-injection molded plastic part 31 not only has excellent mechanical properties and chemical stability, but also forms good adhesion to the metal surface, enhancing the sealing effect.

[0077] In one or more embodiments, the main process flow of the double-sealed battery cover of this disclosure is as follows:

[0078] The top cover plate 1 and electrode post 2 are formed by stamping to ensure the accuracy of their shape and size; the electrode post 2 is formed by stamping, machining or cold forging to meet different connection and conductivity requirements.

[0079] Chemical treatment: The surfaces of the top cover plate 1 and electrode post 2 are chemically treated to form a nanoporous structure, thereby enhancing the adhesion between the plastic and the metal and improving the injection molding effect.

[0080] Nano-injection molding: The top cover plate 1, electrode post 2, and sealing ring 32 are embedded together in the mold for nano-injection molding. Under high pressure, the plastic material fills the mold and penetrates into the nanopores, forming a strong bond with the top cover plate 1 and electrode post 2. At the same time, the plastic material compresses the sealing ring 32 during the injection molding process, achieving a double seal.

[0081] In summary, the sealing ring 32 effectively fills the tiny gap between the top cover plate 1 and the electrode post 2, preventing the penetration of gas, liquid, or solid particles. Nano-injection molding technology is used to tightly bond the nano-injection molded plastic part 31 to the top cover plate 1 and the electrode post 2. During the injection molding process, the plastic material penetrates into the nanopores, forming a microscopic connection with the metal surface, thereby achieving a higher level of sealing effect. Therefore, this novel invention employs a dual sealing mechanism, significantly improving the sealing performance and service life of the battery cover.

[0082] This disclosure employs a dual sealing mechanism using a sealing ring 32 and a nano-injection molded plastic part 31, which improves sealing performance, effectively prevents the penetration of gas, liquid or solid particles, ensures the stability and safety of the battery's internal environment, and extends the product's service life to more than 20 years.

[0083] Furthermore, annular ribs 12 and undercut grooves 311 are provided around the periphery of the electrode post hole 11 to achieve an undercut structure. This not only enhances the overall structural strength of the top cover plate 1, effectively resisting external stress and internal pressure, and preventing deformation or cracking of the top cover plate 1, but also improves the connection strength between the top cover plate 1 and other components, and enhances the aesthetics of the external structure. For example, other components include the electrode post 2, the nano-injection molded plastic part 31, and the sealing ring 32.

[0084] Furthermore, the first end 322 of the sealing ring is embedded in the fixing groove 22, which improves the stability and sealing performance of the first layer of sealing mechanism and ensures that the battery cover can maintain a good sealing state even under vibration or impact conditions.

[0085] Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the utility model without departing from the principles and spirit of the present disclosure, and all such changes should fall within the protection scope of the claims of the present disclosure.

Claims

1. A double-sealed battery cover, characterized in that, include: Top cover plate (1), the top cover plate (1) is provided with pole post hole (11), and the outer periphery of the pole post hole (11) is provided with annular rib (12); Electrode post (2), the electrode post (2) passes through the electrode post hole (11), and the peripheral wall of the electrode post (2) is provided with a fixing groove (22); A double sealing assembly (3), the double sealing assembly (3) comprising: Nano-injection molded plastic part (31), the nano-injection molded plastic part (31) is inserted into the gap between the peripheral wall of the electrode post (2) and the top cover plate (1), the nano-injection molded plastic part (31) is provided with an undercut groove (311), the undercut groove (311) is sleeved on the annular rib (12); A sealing ring (32) is inserted into the gap between the fixing groove (22) and the top cover plate (1), and the first end (322) of the sealing ring (32) is embedded in the fixing groove (22).

2. The double-sealed battery cover according to claim 1, characterized in that, The inner surface of the pole hole (11) is provided with a limiting step (13); The electrode post (2) has a clearance step (21) on its peripheral wall; The nano-injection molded plastic part (31) is inserted into the gap between the limiting step (13) and the avoidance step (21).

3. The double-sealed battery cover according to claim 2, characterized in that, The inner surface of the nano-injection molded plastic part (31) is provided with a first protrusion structure (312), and the first protrusion structure (312) abuts against the upper side surface (211) of the avoidance step and the surface layer (212) of the avoidance step. The bottom of the nano-injection molded plastic part (31) is provided with a second protrusion structure (313). The first side (3131) of the second protrusion structure (313) abuts against the lower side (213) of the avoidance step, the second side (3132) of the second protrusion structure (313) abuts against the upper side (131) of the limiting step, and the third side (3133) of the second protrusion structure (313) abuts against the second end (323) of the sealing ring (32) opposite to the first end (322). The first side (3131) of the second protrusion structure (33) is disposed opposite to its second side (3132), and the first side (3131) of the second protrusion structure (313) is disposed perpendicular to its third side (3133).

4. The double-sealed battery cover according to claim 2, characterized in that, The sealing ring (32) is inserted into the gap between the fixing groove (22) and the limiting step (13), and the second end (323) of the sealing ring (32) opposite to the first end (322) abuts against the upper side surface (131) of the limiting step.

5. The double-sealed battery cover according to claim 1, characterized in that, The first end (322) of the sealing ring (32) is provided with a third protrusion structure (321); The fixing groove (22) includes a first groove (221) and a second groove (222) that are in communication; The opening (2213) of the first groove faces the limiting step (13). The first groove (221) accommodates the first end (322) of the sealing ring (32). A through hole (2212) is opened on the groove wall (2211) of the first groove. The through hole (2212) is reused as the opening (2221) of the second groove. The second groove (222) accommodates the third protrusion structure (321).

6. The double-sealed battery cover according to claim 1, characterized in that, The angle between the annular rib (12) and the top cover plate (1) is 0-180°.

7. The double-sealed battery cover according to claim 6, characterized in that, The longitudinal section (120) of the annular rib includes a bottom edge (121), a first side edge (122), a top edge (123), and a second side edge (124) connected in sequence; The length of the bottom edge (121) is greater than the length of the top edge (123); The angle between the first side (122) and the upper surface of the top cover plate (1) is greater than 0° and less than 90°; The angle between the second side (123) and the upper surface of the top cover plate (1) is greater than 90° and less than 180°.

8. The double-sealed battery cover according to claim 6, characterized in that, The longitudinal section (120) of the annular rib includes a bottom edge (121), a first side edge (122), a top edge (123), and a second side edge (124) connected in sequence; The first side (122) is parallel to the second side (124); The angle between the first side (122) and the upper surface of the top cover plate (1) is greater than 0° and less than 90°; The angle between the second side (124) and the upper surface of the top cover plate (1) is complementary to the angle between the first side (122) and the upper surface of the top cover plate (1).

9. The double-sealed battery cover according to claim 6, characterized in that, The longitudinal section (120) of the annular rib includes a bottom edge (121), a first side edge (122), a top edge (123), and a second side edge (124) connected in sequence; The first side (122) is parallel to the second side (124); The angle between the first side (122) and the upper surface of the top cover plate (1) is greater than 90° and less than 180°; The angle between the second side (124) and the upper surface of the top cover plate (1) is complementary to the angle between the first side (122) and the upper surface of the top cover plate (1).

10. The double-sealed battery cover according to claim 1, characterized in that, The undercut groove (311) is an annular groove with a ring structure; The nano-injection molded plastic part (31) is an injection molded part.

11. The double-sealed battery cover according to claim 7, characterized in that, The angle between the first side (122) and the upper surface of the top cover plate (1) is greater than 0° and less than 60°; The angle between the second side (123) and the upper surface of the top cover plate (1) is greater than 120° and less than 180°.

12. The double-sealed battery cover according to claim 8, characterized in that, The angle between the first side (122) and the upper surface of the top cover plate (1) is greater than 0° and less than 60°.

13. The double-sealed battery cover according to claim 9, characterized in that, The angle between the first side (122) and the upper surface of the top cover plate (1) is greater than 120° and less than 180°.

14. The double-sealed battery cover according to claim 1, characterized in that, The fixing groove (22) is an annular groove with a ring structure; The first protrusion structure (312), the second protrusion structure (313) and the third protrusion structure (321) are all annular protrusion structures.

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