Winding cell and battery

By designing the first groove and recess structure in the bending area of ​​the lithium-ion battery winding cell, the problem of lithium plating at the cell corner is solved, the battery life and safety are improved, and the electrolyte distribution and stress dispersion are improved.

CN224501975UActive Publication Date: 2026-07-14HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
Filing Date
2025-06-20
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

During long-term cycling, lithium-ion batteries experience severe lithium deposition at the cell corner interface, leading to shortened battery life and safety hazards. This is mainly due to the unevenness of lithium-ion transport channels caused by electrode expansion and electrolyte loss.

Method used

The design of the first groove and recess structure in the bending area of ​​the wound cell increases the electrolyte storage space and optimizes the lithium ion transport path. By setting the groove and recess structure in the electrode and support, the electrolyte distribution and stress dispersion are improved.

Benefits of technology

It effectively prevents electrolyte loss, reduces lithium plating, improves battery life and safety, and enhances battery stability and durability.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224501975U_ABST
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Abstract

The utility model discloses a kind of winding electric core and battery, winding electric core includes first pole piece, diaphragm, second pole piece and support part. First pole piece has base material layer and is set to the active material layer of base material layer opposite two sides. Diaphragm is located at the side of first pole piece, at the side of first pole piece towards diaphragm, active material layer has first recess. Second pole piece, located at the side of diaphragm away from first pole piece. Support part connects the side of diaphragm towards first pole piece, the side of support part towards first pole piece has recessed structure. Wherein, along the winding direction of winding electric core, winding electric core has the alternate distribution of straight area and curved area, first recess and recessed structure are all located in curved area. The present application can improve the situation of lithium ion battery corner lithium, improve the life of lithium ion battery.
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