Battery and battery pack

By setting specific proportions and shapes of solder marks at the welding points of the battery tabs and terminal components, the problem of tab breakage after the battery size is increased is solved, improving the tear resistance of the tabs and the safety of the battery cell.

CN122246438APending Publication Date: 2026-06-19CALB GROUP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CALB GROUP CO LTD
Filing Date
2026-04-29
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

When the size of existing batteries is increased, the tabs are prone to breakage, affecting the current carrying capacity.

Method used

A first solder mark and a second solder mark are provided at the welding point between the electrode tab and the electrode post assembly. The extension direction of the first solder mark is parallel to the second direction, and the extension direction of the second solder mark intersects the first direction. The length ratio satisfies 0.002≤L2/L1≤0.14. The first solder mark is used to bear and disperse the concentrated stress generated by the vibration and self-weight of the battery cell, while the second solder mark plays a buffering and connecting role.

Benefits of technology

It significantly reduces the risk of the tab breaking due to stress concentration, improves the tab's tear resistance and structural reliability, ensures overcurrent capacity, and extends the cell's service life.

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    Figure CN122246438A_ABST
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Abstract

This invention relates to the field of new energy battery technology, and discloses a battery and battery pack. The battery mainly includes: a casing, a terminal assembly, and a cell. The terminal assembly is disposed at one end of the casing along a first direction. The cell is disposed within the casing and includes a cell body and tabs extending from the cell body along the first direction. The tabs are welded to the terminal assembly, forming a solder mark. The solder mark includes a first solder mark and a second solder mark interconnected. The extension direction of the second solder mark is parallel to the first direction, and the extension directions of the first and second solder marks intersect. Along the second direction, the length of the first solder mark is L1, and along the first direction, the length of the second solder mark is L2, satisfying 0.002≤L2 / L1≤0.14. In this invention, the solder mark between the tab and the terminal assembly has a first solder mark and a second solder mark, which improves the tear resistance of the tab and ensures the current carrying capacity of the tab, thereby improving the safety and service life of the battery.
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