Winding core and battery

By setting convex and flat sections on the positive electrode, the problem of insufficient electrolyte and poor wetting caused by volume expansion of silicon-based negative electrode materials in lithium-ion batteries is solved, which improves the cycle life of the battery and the stability of the negative electrode, and ensures the energy density and safety of the battery.

CN122117770APending Publication Date: 2026-05-29ZHUHAI COSMX BATTERY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHUHAI COSMX BATTERY CO LTD
Filing Date
2024-11-29
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The volume expansion of silicon-based anode materials during the charging and discharging process of lithium-ion batteries leads to interlayer compression of the cell, resulting in insufficient electrolyte and poor wetting, causing rapid capacity decay and poor cycle stability of the anode sheet.

Method used

The structure has multiple protrusions and flat sections on the positive electrode. The protrusions are formed by the positive electrode protruding from the second surface to the first surface. The protrusions can effectively support the separator, increase the electrolyte storage space, absorb the expansion stress of the negative electrode, improve the electrolyte distribution, and buffer the expansion of the negative electrode.

Benefits of technology

It improves the cycle life of the battery and the lifespan of the negative electrode, reduces the rate of battery capacity decay, improves the deterioration of the electrode interface and the electrolyte wetting effect, and ensures the energy density and safety of the battery.

✦ Generated by Eureka AI based on patent content.

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    Figure CN122117770A_ABST
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Abstract

The application provides a winding core and a battery, and relates to the technical field of batteries. The winding core is formed by winding a positive plate, a diaphragm and a negative plate. The positive plate comprises a first surface and a second surface. The positive plate is provided with a plurality of convex portions and flat portions between adjacent convex portions. The convex portions are formed by protruding part of the positive plate from the second surface to the first surface. The maximum distance from the vertex of the convex portion to the plane of the first surface is h1. The thickness of the flat portion on the positive plate is h. 5%<=h1 / h<=30%. The negative plate comprises a negative current collector and a negative active layer on the negative current collector. The negative active layer comprises a silicon-carbon composite material and / or a silicon-oxygen composite material. The percentage content of silicon in the negative active layer is W1. 0.3<=W1 / (h1 / h)<=5. The winding core can increase the liquid storage space between layers, improve the liquid retention amount between layers, and delay the attenuation of the battery capacity.
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