Batteries and battery packs

By controlling the ratio of the tab spacing to the cell length, the problem of insufficient overcurrent capacity and short-circuit risk caused by misalignment of the stacked cell tabs was solved, achieving efficient overcurrent and improved safety of the battery.

CN122136483APending Publication Date: 2026-06-02CALB 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
2025-05-27
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

During the stacking process of battery cells, poor end alignment between the electrodes can lead to misalignment of the tabs, affecting the overcurrent capacity and consequently causing insufficient overcurrent capacity or the risk of internal short circuit.

Method used

By controlling the ratio (a/a2) of the spacing between the positive and negative tabs along the second direction to the width of the laminated cell along the second direction, and the length (b) of the cell body along the first direction, it is ensured that the positive and negative tabs are led out from the same end of the cell body, and the electrical connection between the tabs and the cover plate is reasonably arranged to avoid misalignment and short circuit risks.

Benefits of technology

It improves the battery's overcurrent capacity, reduces the risk of internal short circuits, and enhances the battery's space utilization and safety.

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Abstract

This invention relates to the field of new energy technology and discloses a battery and battery pack. The battery includes: a casing; terminals; and a laminated cell including a cell body and a tab extending from one end of the cell body along a first direction. The tab is electrically connected to the terminals. The tab includes a positive tab and a negative tab, both located at the same end of the cell body along the first direction. The positive and negative tabs are spaced apart along a second direction, which is perpendicular to the first direction. The spacing between the positive and negative tabs along the second direction is a1, the width of the laminated cell along the second direction is a2, satisfying a = a1 / a2, and the length of the cell body along the first direction is b, satisfying 8mm ≤ b × a ≤ 350mm. In the battery provided by this invention, an excessively large b × a can easily lead to an increased current demand in the cell and a reduction in the area of ​​the welding region. An excessively small b × a can result in a lower battery energy density.
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