A positive electrode sheet and a battery cell

By introducing a filling layer with different lithium-ion diffusion coefficients and volume resistivity into the positive electrode, the lithium-ion diffusion rate is controlled, solving the problem of lithium plating at high energy density and high charge/discharge rates, and improving the safety and lifespan of the battery cell.

CN224328679UActive Publication Date: 2026-06-05ZHEJIANG 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
2025-04-29
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Under conditions of high energy density and high charge/discharge rate, lithium plating is prone to occur at the tabs of the negative electrode, affecting the safety and lifespan of the battery cell.

Method used

A positive electrode is designed, comprising a current collector, a filling layer, and an active material layer, wherein the lithium-ion diffusion coefficient and volume resistivity of the filling layer are smaller than those of the active material layer, the filling layer corresponds to the area covered by the positive electrode adhesive paper, and is disposed on one side or at least one end of the current collector, and lithium plating is reduced by controlling the lithium-ion diffusion rate and concentration difference.

Benefits of technology

This effectively reduces the lithium-ion concentration difference between the positive electrode tab and the OH region, reduces lithium plating, and improves the safety performance and lifespan of the battery cell.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN224328679U_ABST
    Figure CN224328679U_ABST
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Abstract

The utility model relates to lithium cell technical field discloses a kind of positive plate and electric core, positive plate, including current collector, filling layer and active material layer;The current collector extends in the first direction;The filling layer is located in the side face of the current collector and the positive lug rubber paper covering area corresponds, and / or, at least one end of the current collector in the first direction;The active material layer and the filling layer are located in the same side face of the current collector, and the active material covers the coating area of the current collector and the filling layer;Wherein, the lithium ion diffusion coefficient of the filling layer is less than the lithium ion diffusion coefficient of the active material layer;And / or, the volume resistivity of the filling layer is greater than the volume resistivity of the active material layer.The utility model has the beneficial effect that: reduce the lithium ion concentration difference of the lug periphery and OH area of positive plate in the process of charge and discharge, reduce the generation of lithium precipitation phenomenon, improve the use safety performance and life of electric core.
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