Battery upper cover assembly

Abstract

The utility model relates to the technical field of electric appliance components, and provides a battery upper cover assembly which comprises a cover plate, a through hole is formed in the center of the cover plate, a lead column is arranged in the center of the through hole, an insulator is filled and sealed between the lead column and the inner wall of the through hole, and a connecting part used for inserting a positive pole lug is arranged at the end part of the lead column. The contact area of the lead column and the positive pole lug is increased, the connection stability of the lead column and the positive pole lug is improved, and the conductivity of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic components, in particular to a battery upper cover assembly. Background Art

[0002] A positive terminal current lead-out device with good sealing, corrosion resistance and suitable for long-term storage is necessary for lithium batteries. At present, the commonly used positive terminal current lead-out device is a glass insulator made of 4J28 alloy lead and soft glass sealing. The bottom end of the lead of this glass insulator is usually directly connected to the positive pole ear to achieve electrical connection. Under the influence of high temperature and high pressure, external vibration or impact, the connection between the lead and the positive pole ear may become loose or broken, posing a greater risk of failure. At the same time, conventional glass insulators have a high resistivity and large losses during discharge. Utility Model Content

[0003] The utility model aims to provide a battery upper cover assembly, which solves the above technical problems, increases the stability of the connection between the lead post and the positive electrode ear, and improves the conductivity of the battery.

[0004] The embodiment of the utility model is realized through the following technical scheme: a battery upper cover assembly includes a cover plate, a through hole is opened at the center of the cover plate, a lead post is arranged at the center of the through hole, an insulator is filled and sealed between the lead post and the inner wall of the through hole, and a connecting portion for inserting a positive electrode ear is arranged at the end of the lead post.

[0005] Furthermore, the connecting portion is bent into an H-shape with a circular arc transition by cold stamping.

[0006] Furthermore, the lead column is made of tantalum metal material.

[0007] Furthermore, a convex ring is provided on the lower end surface of the cover plate around the insulator.

[0008] Furthermore, the cover plate is formed by stamping of nickel-plated cold-rolled steel.

[0009] Furthermore, the diameter of the lead post is 0.65-0.85 mm.

[0010] Furthermore, the sealing length between the insulator and the lead post is 2.4 mm.

[0011] The utility model has at least the following advantages and beneficial effects: by arranging the plug-in portion at the end of the lead post, the contact area between the lead post and the positive electrode tab is increased, the stability of the connection between the lead post and the positive electrode tab is increased, and the conductivity of the battery is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 A cross-sectional view of a battery upper cover assembly provided by the utility model;

[0014] Figure 2 A top view of a battery upper cover assembly provided by the utility model;

[0015] Figure 3 A schematic diagram of the structure of a lead post in a battery upper cover assembly provided by the utility model;

[0016] Icon: 1-cover, 10-through hole, 11-liquid injection hole, 12-convex ring, 2-lead column, 21-connecting part, 3-insulator. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example

[0020] like Figure 1-3As shown, in this embodiment, a battery upper cover assembly is mainly disclosed, which has a simple structure and is easy to manufacture, and is suitable for cylindrical batteries. It includes a cover plate 1, a through hole 10 is opened at the center of the cover plate 1, a lead post 2 is arranged at the center of the through hole 10, an insulator 3 is filled and sealed between the lead post 2 and the inner wall of the through hole 10, and a connecting portion 21 for plugging the positive electrode ear is arranged at the end of the lead post 2. Specifically, the insulator 3 is usually made of glass. During production, glass powder is sintered into a columnar glass body, and a lead pin is reserved in the middle. The lead post 2 is inserted into the socket of the lead post 2, and then the lead post 2 is inserted into the insulator 3, and the cover plate 1, the insulator 3 and the lead post 2 are combined together. In a high temperature environment, the glass body melts and is finally cooled and fixed to form a glass insulator. It should be noted that the connecting part 21 should have a plug-in groove that cooperates with the positive electrode tab, so that the positive electrode tab is fitly inserted in the middle of the connecting part 21, thereby increasing the contact area between the lead post 2 and the positive electrode tab, ensuring the stability of the connection between the lead post 2 and the positive electrode tab, and improving the conductivity of the battery.

[0021] Furthermore, in a specific implementation, the above-mentioned connecting portion 21 provided in the embodiment of the utility model is bent into an H-shape with an arc transition by cold stamping. Specifically, the positive electrode ear is inserted in the middle of the H-shaped opening and is in close contact with the side wall. By cold stamping and bending, the original properties of the material can be maintained, ensuring the strength and stability of the connecting portion 21.

[0022] Furthermore, in a specific implementation, the lead column 2 provided in the embodiment of the utility model is made of tantalum metal material, which has a lower resistivity.

[0023] Furthermore, in a specific implementation, a convex ring 12 is provided around the insulator 3 on the lower end surface of the cover plate 1 provided in the embodiment of the utility model, which increases the sealing thickness, so that the battery has good discharge capacity at room temperature and good storage performance; in addition, the convex ring 12 can be integrally formed with the cover plate 1.

[0024] Furthermore, in a specific implementation, the cover plate 1 provided in the embodiment of the utility model is formed by stamping nickel-plated cold-rolled steel, which has high strength, strong corrosion resistance and high mass production efficiency.

[0025] Furthermore, in a specific implementation, the diameter of the lead post 2 provided in the embodiment of the utility model is 0.65-0.85 mm; the sealing length between the insulator 3 and the lead post 2 is 2.4 mm, so as to ensure the reliability of the sealing.

[0026] In addition, the cover plate 1 is provided with a liquid injection hole 11 for adding electrolyte.

[0027] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery cover assembly, characterized in that: The invention comprises a cover plate (1), wherein a through hole (10) is provided at the center of the cover plate (1), a lead post (2) is provided at the center of the through hole (10), an insulator (3) is filled and sealed between the lead post (2) and the inner wall of the through hole (10), and a connection portion (21) for plugging a positive electrode tab is provided at the end of the lead post (2).

2. A battery cover assembly as claimed in claim 1, characterized in that: The connecting portion (21) is bent into an H-shape with a circular arc transition by cold stamping.

3. A battery cover assembly as claimed in claim 1, characterized in that: The lead column (2) is made of tantalum metal material.

4. A battery cover assembly as claimed in claim 1, characterized in that: The lower end surface of the cover plate (1) is provided with a convex ring (12) around the insulator (3).

5. A battery cover assembly as claimed in claim 1, characterized in that: The cover plate (1) is formed by stamping nickel-plated cold-rolled steel.

6. A battery cover assembly as claimed in claim 1, characterized in that: The diameter of the lead post (2) is 0.65-0.85 mm.

7. A battery cover assembly as claimed in claim 1, characterized in that: The sealing length between the insulator (3) and the lead post (2) is 2.4 mm.

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