Battery liquid injection hole sealing structure, cover plate assembly, shell assembly and power battery

Abstract

The utility model discloses a battery liquid injection hole sealing structure, a cover plate assembly, a shell assembly and a power battery, the sealing structure comprises a metal ball and a plastic part, the metal ball is arranged on the plastic part, the lower part of the metal ball and the plastic part are formed into a whole through injection molding, the lower part of the plastic part is outwards convexly provided with a convex ring, and the convex ring is arranged on the plastic part. And the metal ball and the convex ring are configured to be in interference sealing fit with the liquid injection hole. According to the utility model, metal chips generated by friction when the metal ball is knocked into the liquid injection hole can be prevented from falling into the battery, so that the safety risk of the battery is reduced, the scheme of quickly sealing by using the metal ball is suitable for the power battery, and compared with the scheme of sealing by laser welding through a sealing nail, the production efficiency and the production yield of the power battery are improved; and meanwhile, the production cost of the power battery is also reduced.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to a battery liquid injection hole sealing structure, a cover plate assembly, a shell assembly and a power battery. Background Art

[0002] At present, cylindrical power batteries such as lithium-ion and sodium-ion have gradually become mainstream products in the new energy industry due to their high energy density, good capacity consistency, and ability to support high-rate charge and discharge. More and more manufacturers continue to pursue the simplification of cylindrical power battery structures to reduce costs and improve the level of metal chip control to enhance battery safety. However, the following common problems still exist:

[0003] Common small batteries are usually sealed quickly by knocking in a sealing steel ball that is an interference fit with the injection hole, and then applying UV glue to seal and fix. However, cylindrical power batteries have a larger capacity, and considering the interference fit between the steel ball and the injection hole, it is easy for unpredictable metal chips to fall into the battery due to friction when knocking in, posing a safety risk to the battery, which leads to non-power battery manufacturers daring to use steel balls for sealing.

[0004] Traditional cylindrical power batteries use sealing pin laser welding, and the production efficiency is far lower than the steel ball sealing method. In addition, when the sealing pin laser welding is poor, it will cause leakage problems, resulting in battery scrapping, etc., which increases the battery manufacturing cost. Utility Model Content

[0005] The purpose of the utility model is to provide a battery liquid filling hole sealing structure, a cover plate assembly, a shell assembly and a power battery, which can solve at least one technical problem in the background technology.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a battery filling hole sealing structure, including a metal ball and a plastic part, the metal ball is arranged on the plastic part, the lower part of the metal ball and the plastic part are integrated by injection molding, the lower part of the plastic part is provided with a convex ring protruding outward, and the metal ball and the convex ring are configured to cooperate with the filling hole in an interference seal.

[0007] Optionally, a plurality of embedding holes and / or grooves are formed on the lower surface of the metal ball, and when the lower part of the metal ball and the plastic part are integrated by injection molding, the plastic part is embedded in the embedding holes and / or the grooves.

[0008] Optionally, the plastic part is entirely located at a lower side of a horizontal mid-section of the metal ball.

[0009] Optionally, when the plastic part is assembled in the liquid injection hole, the part of the plastic part located above the convex ring is spaced apart from the side wall of the liquid injection hole.

[0010] Optionally, the middle portion of the outer peripheral surface of the plastic part is concave as a whole to form a concave area.

[0011] Optionally, the plastic part is provided with a plurality of convex rings protruding outwards.

[0012] Optionally, the convex ring is a spiral convex ring.

[0013] In order to achieve the above-mentioned purpose, the utility model also provides a cover plate assembly, including a cover plate and a battery filling hole sealing structure as mentioned above, wherein the cover plate is provided with a filling hole, the sealing structure is sealingly assembled on the filling hole, the convex ring is in sealing contact with the side wall of the filling hole, and a closed groove for storing metal chips falling downward is formed above the convex ring.

[0014] In order to achieve the above-mentioned purpose, the utility model also provides a shell assembly, including a shell, the bottom of the shell is provided with a liquid injection hole, the liquid injection hole is provided with a battery liquid injection hole sealing structure as described above, the convex ring is in sealing contact with the side wall of the liquid injection hole, and a closed groove for storing metal chips falling downward is formed above the convex ring.

[0015] In order to achieve the above-mentioned purpose, the utility model also provides a power battery, including the cover plate assembly or the shell assembly as described above.

[0016] In the utility model, the lower part of the metal ball is connected with the plastic part through injection molding, and the lower part of the plastic part is provided with a convex ring protruding outward, and the convex ring is matched with the injection hole by interference sealing. When the metal ball is knocked into the injection hole, the convex ring has previously constructed a sealing groove with the side wall of the injection hole to receive the fallen metal chips, thereby preventing the metal chips generated by friction when the metal ball is knocked into the injection hole from falling into the battery, reducing the safety risk of the battery, making the solution of rapid sealing using metal balls suitable for power batteries. Compared with the solution of sealing with sealing nails and laser welding, the production efficiency and production yield of power batteries are improved, and the production cost of power batteries is also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the battery liquid filling hole sealing structure according to an embodiment of the utility model.

[0018] Figure 2 It is a schematic diagram of the exploded structure of the battery liquid filling hole sealing structure according to an embodiment of the utility model.

[0019] Figure 3 It is a side structural schematic diagram of the battery liquid filling hole sealing structure according to an embodiment of the utility model.

[0020] Figure 4 It is a schematic cross-sectional structure diagram of the top cover assembly of the embodiment of the utility model. DETAILED DESCRIPTION

[0021] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0022] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0023] See also Figures 1 to 4 The embodiment of the utility model discloses a battery injection hole sealing structure, including a metal ball 10 and a plastic part 20, wherein the metal ball 10 is arranged on the plastic part 20, the lower part of the metal ball 10 and the plastic part 20 are integrally formed by injection molding, and a convex ring 21 is protruded outward from the lower part of the plastic part 20. The metal ball 10 and the convex ring 21 are configured to be in interference sealing cooperation with the injection hole 31, so that in the process of assembling the sealing structure to the injection hole 31, the convex ring 21 is in sealing contact with the injection hole 31, and a dynamically changeable closed groove 40 for storing metal chips falling downward is formed above the convex ring 21, that is, before the metal ball 10 is knocked into the injection hole 31, the sealing groove 40 has been formed, and in the process of knocking the metal ball 10 into the injection hole 31, the convex ring 21 moves downward and maintains a sealing contact with the side wall of the injection hole 31, that is, the closed groove 40 moves downward dynamically to ensure the reception of metal chips.

[0024] In the utility model, the lower part of the metal ball 10 is integrally connected with the plastic part 20 by injection molding, and the lower part of the plastic part 20 is provided with a convex ring 21 protruding outward, and the convex ring 21 is fitted with the injection hole 31 in an interference seal. When the metal ball 10 is knocked into the injection hole 31, the convex ring 21 has previously constructed a sealing groove 40 with the side wall of the injection hole 31 to receive the fallen metal chips, thereby preventing the metal chips generated by friction when the metal ball 10 is knocked into the injection hole 31 from falling into the battery, reducing the safety risk of the battery, making the solution of rapid sealing using the metal ball 10 suitable for power batteries, and compared with the solution of sealing by sealing nails and laser welding, the production efficiency and production yield of the power battery are improved, and the production cost of the power battery is also reduced.

[0025] Specifically, the material of the plastic part 20 can be PP, PBT, etc.

[0026] In some embodiments, a plurality of embedding holes 11 are formed on the lower surface of the metal ball 10, and when the lower portion of the metal ball 10 and the plastic part 20 are integrated by injection molding, the plastic part 20 is embedded in the embedding holes 11. Since a plurality of embedding holes 11 are formed on the lower surface of the metal ball 10, when the lower portion of the metal ball 10 and the plastic part 20 are integrated by injection molding, the plastic part 20 is embedded in the embedding holes 11, so that the metal ball 10 and the plastic part 20 can be firmly combined into one.

[0027] Specifically, the embedded hole 11 may be a blind hole, a through hole and / or a nano-micro hole.

[0028] Of course, the embedding hole 11 may also be replaced by a groove, or both the embedding hole 11 and the groove may be provided.

[0029] In some embodiments, the plastic part 20 is entirely located below the horizontal mid-section (through the center of the ball) of the metal ball 10, thereby facilitating the formation of a completely open closed groove 40, so that metal chips generated at various positions of the metal ball 10 can fall into the closed groove 40, while also avoiding interference fit between the metal ball 10 and the injection hole 31. In a specific example, the distance between the upper edge of the plastic part 20 and the horizontal mid-section of the metal ball 10 is greater than 0.5 mm.

[0030] In some embodiments, the metal ball 10 is a steel ball, but is not limited thereto. When the metal ball 10 is a steel ball, it can be made of stainless steel.

[0031] In some embodiments, when the plastic part 20 is assembled in the injection hole 31, the portion of the plastic part 20 located above the protruding ring 21 is spaced apart from the side wall of the injection hole 31. Since the portion of the plastic part 20 located above the protruding ring 21 is spaced apart from the side wall of the injection hole 31, the metal chips dropped from different positions of the metal ball 10 can fall smoothly into the closed groove 40.

[0032] Specifically, the middle of the outer peripheral surface of the plastic part 20 is concave as a whole to form a concave area 22. The formation of the concave area 22 facilitates the closed groove 40 to receive the fallen metal chips. In a specific example, the concave area 22 is a cylinder with a diameter smaller than the diameter of the injection hole 31, but is not limited thereto. The upper part of the outer peripheral surface of the plastic part 20 tapers from top to bottom.

[0033] In some embodiments, the plastic part 20 is provided with a plurality of protruding rings 21 protruding outwards, and the sealed groove 40 is formed above the uppermost protruding ring 21. Specifically, the protruding ring 21 is a circular ring with a diameter greater than that of the injection hole 31.

[0034] In some embodiments, the protruding ring 21 is a spiral protruding ring.

[0035] Of course, the convex ring 21 is not limited to the form of the above-mentioned multiple convex rings 21 or spiral convex ring. As long as it is a structure that can prevent metal chips from falling downward from any position of the injection hole 31, it can be regarded as the convex ring 21 in the present invention.

[0036] Please combine Figure 4 The embodiment of the utility model also discloses a cover plate assembly, including a cover plate 30 and the battery injection hole sealing structure as described above, the cover plate 30 is provided with an injection hole 31, the battery injection hole sealing structure is sealed and assembled on the injection hole 31, the convex ring 21 is in sealing contact with the side wall of the injection hole 31, and a closed groove 40 for storing metal chips falling downward is formed above the convex ring 21, and UV glue can be applied for sealing and fixing after assembly. The "cover plate" here is usually referred to as the top cover in the industry. Of course, other situations are not excluded. For example, when cover plates are provided at both ends of the battery, the injection hole 31 can be set as needed.

[0037] Please combine Figure 4 The utility model embodiment also discloses a shell assembly, including a shell 30, the shell bottom of the shell 30 is provided with a liquid injection hole 31, the liquid injection hole 31 is provided with a battery liquid injection hole sealing structure as described above, the convex ring 21 is in sealing contact with the side wall of the liquid injection hole 31, and a closed groove 40 for storing metal chips falling downward is formed above the convex ring 31.

[0038] The embodiment of the utility model further discloses a power battery, comprising the cover plate assembly or the shell assembly as described above.

[0039] In the utility model, the lower part of the metal ball 10 is integrally connected with the plastic part 20 by injection molding, and the lower part of the plastic part 20 is provided with a convex ring 21 protruding outward, and the convex ring 21 is fitted with the injection hole 31 in an interference seal. When the metal ball 10 is knocked into the injection hole 31, the convex ring 21 has already constructed a sealing groove 40 with the side wall of the injection hole 31 in advance to receive the fallen metal chips, thereby preventing the metal chips generated by the friction when the metal ball 10 is knocked into the injection hole 31 from falling into the battery, reducing the safety risk of the battery, making the solution of rapid sealing using the metal ball 10 suitable for power batteries. Compared with the solution of sealing with sealing nails and laser welding, the production efficiency and production yield of the power battery are improved, and the production cost of the power battery is also reduced.

[0040] The above disclosure is only a preferred example of the present invention, and its role is to facilitate the technical personnel in this field to understand and implement it. Of course, it cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A battery filling hole sealing structure, characterized in that: It includes a metal ball and a plastic part. The metal ball is arranged on the plastic part. The lower part of the metal ball and the plastic part are integrated by injection molding. The lower part of the plastic part is provided with a convex ring protruding outward. The metal ball and the convex ring are configured to be interference-sealed with the injection hole.

2. The battery liquid filling hole sealing structure according to claim 1, characterized in that: A plurality of embedding holes and / or grooves are formed on the lower surface of the metal ball. When the lower part of the metal ball and the plastic part are integrated by injection molding, the plastic part is embedded in the embedding holes and / or the grooves.

3. The battery liquid filling hole sealing structure according to claim 1, characterized in that: The plastic part is entirely located at the lower side of the horizontal middle section of the metal ball.

4. The battery liquid filling hole sealing structure according to claim 1, characterized in that: When the plastic part is assembled in the liquid injection hole, the part of the plastic part located above the convex ring is spaced apart from the side wall of the liquid injection hole.

5. The battery liquid filling hole sealing structure according to claim 4, characterized in that: The middle part of the outer peripheral surface of the plastic part is concave as a whole to form a concave area.

6. The battery liquid filling hole sealing structure according to claim 1, characterized in that: The plastic part is provided with a plurality of convex rings protruding outwards.

7. The battery liquid filling hole sealing structure according to claim 1, characterized in that: The convex ring is a spiral convex ring.

8. A cover plate assembly, characterized in that: It comprises a cover plate and a battery filling hole sealing structure as claimed in any one of claims 1 to 7, wherein the cover plate is provided with a filling hole, the sealing structure is sealingly assembled on the filling hole, the convex ring is in sealing contact with the side wall of the filling hole, and a closed groove for storing metal chips falling downward is formed above the convex ring.

9. A housing assembly, characterized in that: It comprises a shell, the bottom of which is provided with a liquid injection hole, the liquid injection hole is provided with a battery liquid injection hole sealing structure as described in any one of claims 1 to 7, the convex ring is in sealing contact with the side wall of the liquid injection hole, and a closed groove for storing metal chips falling downward is formed above the convex ring.

10. A power battery, characterized in that: It comprises the cover plate assembly as claimed in claim 8 or the shell assembly as claimed in claim 9.

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