Pole structure, battery case and battery cell

By using a composite electrode structure of aluminum and copper pillars, the problems of poor soldering and damage to the sealing ring in the battery cell were solved, and a stable battery connection was achieved.

CN224355320UActive Publication Date: 2026-06-12SHENZHEN KEDALI INDUSTRY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHENZHEN KEDALI INDUSTRY CO LTD
Filing Date
2025-04-14
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

When the negative electrode post of a cylindrical battery cell is welded with pure copper to an aluminum connecting piece, there are problems with incomplete welding and damage to the sealing ring, resulting in unstable connection.

⚗Method used

The device employs a composite pole structure of aluminum and copper pillars. The outer side of the aluminum pillar is welded to an aluminum connecting piece, and the inner side of the copper pillar is welded to a copper component inside the housing. The welding surface is designed to be flat to increase the welding area, and the aluminum and copper pillars are clamped and fixed on the inner and outer sides of the housing through their convex edges.

🎯Benefits of technology

It improves the welding stability of the connecting piece and the terminal post, reduces the probability of poor welding and damage to the sealing ring, and enhances the connection reliability of the battery casing.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224355320U_ABST
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Abstract

This utility model belongs to the field of battery technology and discloses a terminal post structure, a battery casing, and a battery cell. The terminal post structure is disposed on the casing of the battery casing and includes an aluminum post and a copper post. The aluminum post includes a first end and a second end arranged opposite to each other. The first end is configured to be located outside the casing and its surface is a welding surface. The welding surface is flat and is used to weld with an aluminum connecting piece. The copper post includes a third end and a fourth end arranged opposite to each other. The third end is fixedly connected to the second end, and the fourth end is configured to be located inside the casing and welded to a copper component inside the casing. This terminal post structure can reduce the probability of poor soldering and damage to the sealing ring, and can also improve the stability of the connection between the connecting piece and the aluminum post.
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