Pole piece, battery cell and battery

By designing a normal coating area, a weakening area, and an empty foil area on the surface of the electrode current collector, the capacity of the active material layer is optimized, the problem of excessively high temperature near the electrode tab is solved, and the battery safety and fast charging performance are improved.

CN224501894UActive Publication Date: 2026-07-14ZHEJIANG LIWINON ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHEJIANG LIWINON ENERGY TECHNOLOGY CO LTD
Filing Date
2025-06-06
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In existing battery cell structures, the temperature near the tabs is too high, which leads to a decrease in battery performance, reduced safety, and limited fast charging capability.

Method used

An electrode structure is designed with a normal coating area, a weakening area, and an empty foil area on the current collector surface. The electrode tab is connected to the empty foil area. The active material layer gradually reduces its capacity through multiple sub-weakening layers to optimize the ion transport path and reduce internal resistance and heat generation.

Benefits of technology

It effectively controls the temperature rise near the tabs, improves battery safety and fast charging performance, extends service life, and enhances the overall performance stability of the battery.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN224501894U_ABST
    Figure CN224501894U_ABST
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Abstract

The utility model discloses a kind of pole piece, battery cell and battery, wherein pole piece includes current collector, pole lug and active substance.The current collector has first surface and second surface in the thickness direction of itself, first surface includes normal coating area, weakening area and empty foil area, weakening area is located between empty foil area and normal coating area, weakening area includes multiple sub-weakening areas of half-enclosing structure distributed from coating area to empty foil area;Pole lug is connected to empty foil area;Active substance includes first active substance layer arranged on first surface, first active substance layer includes normal coating layer arranged in normal coating area and first weakening layer arranged in weakening area, first weakening layer includes multiple first sub-weakening layers arranged in multiple sub-weakening areas respectively, and the capacity of multiple first sub-weakening layers gradually decreases.Therefore, the smaller the internal resistance in the position closer to pole lug, according to Joule's law, the smaller the heat generated by smaller internal resistance, thereby effectively controlling temperature rise near pole lug to improve the performance of battery.
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