一种电池盖板及锂离子电池

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By using a sealed connection between the injection-molded packaging material and the substrate, and a heat-fused integrated design, the problems of complex structure and numerous parts in traditional lithium battery cover plates are solved, achieving lightweight and high energy density of the battery cover plate, and improving connection stability and mechanical strength.

CN224519992UActive Publication Date: 2026-07-17HEFEI GUOXUAN HIGH TECH POWER ENERGY

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: HEFEI GUOXUAN HIGH TECH POWER ENERGY
Filing Date: 2025-08-15
Publication Date: 2026-07-17

AI Technical Summary

Technical Problem

Traditional lithium battery cover plates have complex structures, many parts, and are difficult to assemble. They also have shortcomings in mechanical strength, current carrying capacity, and weight.

Method used

The electrode post and the substrate are sealed and connected by injection molding material. The boss is completely covered by nano-injection molding process to enhance the connection strength. The integral structure is formed by hot melt connection, which reduces the number of parts and improves stability and torsional strength.

Benefits of technology

The battery cover structure has been simplified, reducing height and weight, increasing battery energy density, enhancing the connection strength and stability between the terminals and the substrate, and reducing assembly difficulty.

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Abstract

本实用新型公开一种电池盖板及锂离子电池，属于锂电池技术领域，盖板包括基板和极柱，所述基板开设有基孔，所述极柱至少部分位于基孔中；所述基板向基孔的中心方向延伸设置有凸台；所述极柱的外周套设有注塑包材，所述注塑包材将极柱与基板密封连接；所述注塑包材将凸台完全包覆并将基板的底部对应基孔周围部分覆盖。本实用新型的注塑包材将极柱与基板固定的同时将二者密封，注塑包材作为注塑件，同时承担了绝缘的作用。注塑包材具有固定、密封、绝缘多重作用，代替了传统盖板结构中的密封圈和绝缘板结构，减少了零件数量降低装配难度。

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Claims

1. A battery cover plate, comprising a substrate (100) and a terminal post (300), wherein the substrate (100) has a base hole, and the terminal post (300) is at least partially located in the base hole; characterized in that The substrate (100) has a boss (101) extending towards the center of the base hole; the outer periphery of the pole (300) is covered with an injection molding material (200), which seals the pole (300) and the substrate (100); the injection molding material (200) completely covers the boss (101) and covers the bottom of the substrate (100) around the base hole.

2. The battery cover plate of claim 1, wherein, The boss (101) includes a first extension (120) and a second extension (130). The first extension (120) is inclined relative to the base surface (110) of the substrate (100). The second extension (130) is parallel or substantially parallel to the base surface (110) of the substrate (100).

3. The battery cover plate of claim 2, wherein, The angle θ between the first extension (120) and the base surface (110) of the substrate (100) ranges from 90° to 150°.

4. The battery cover plate of claim 1, wherein, The electrode post (300) has an outwardly protruding extension (310) at one end near the battery cell. The injection molding packaging material (200) has a connecting groove (210) at the position corresponding to the extension (310). The extension (310) cooperates with the connecting groove (210).

5. The battery cover plate of claim 1, wherein, The substrate (100) is connected to a stop frame (500) on the side facing the battery cell. The stop frame (500) is provided with a relief groove (510) on the side near the base hole. Part of the structure of the injection molding packaging material (200) extends into the relief groove (510).

6. A battery cover plate according to claim 5, wherein, The stop frame (500) is provided with a heat-melting deformation part, and the substrate (100) is provided with a joint part corresponding to the position of the heat-melting deformation part. The heat-melting deformation part and the joint part cooperate to heat-melt and fix the stop frame (500) and the substrate (100).

7. The battery cover plate of claim 1, wherein, The end of the electrode post (300) facing the battery cell is connected to a connecting piece (400), and the connecting piece (400) is connected to the electrode tab of the battery cell.

8. The battery cover plate of claim 7, wherein, The connecting piece (400) includes a protrusion (410) and a flat surface, the protrusion (410) being connected to the end of the pole (300), and the flat surface being connected to the electrode ear; the injection-molded packaging material (200) separates the flat surface of the edge of the protrusion (410) from the pole (300).

9. The battery cover plate of claim 1, wherein, The substrate (100) is provided with a liquid injection hole (140) and an explosion-proof hole (150). An explosion-proof valve (151) is installed in the explosion-proof hole (150). The substrate (100) is provided with a patch (152) to cover the explosion-proof valve (151).

10. A lithium-ion battery, characterized by, Includes the battery cover as described in any one of claims 1-9.