Battery cell, negative electrode sheet, battery device and electric device

By optimizing the double-layer anode active layer structure and graphitization degree, the stress problem caused by silicon anode expansion was solved, resulting in a high energy density and fast-charging battery cell, which extended battery life and improved charging rate.

WO2026118602A1 Publication Date: 2026-06-11CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2025-09-08
Publication Date
2026-06-11

AI Technical Summary

⚠Technical Problem

Existing graphite anodes are insufficient to meet the demands for high energy density and fast charging. Silicon anodes experience high stress due to volume expansion during charging, which affects the electrolyte reabsorption rate and the structural stability of the positive and negative electrode active materials, thus shortening the lifespan of individual battery cells.

⚗Method used

A double-layer negative electrode active layer structure is adopted, with the lower layer using a first graphite material with a high degree of graphitization and the upper layer using a second graphite material with a lower degree of graphitization. Combined with silicon-based materials, expansion is controlled and electron transport rate is improved. By adjusting the degree of graphitization and particle size, the thickness and composition of the negative electrode active layer are optimized, reducing internal stress and lithium consumption.

🎯Benefits of technology

It achieves a balance between high energy density and fast charging, extends the cycle life of individual battery cells, improves charging capacity, and reduces lithium-ion concentration polarization and lithium consumption.

✦ Generated by Eureka AI based on patent content.

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Abstract

Provided in the present application are a battery cell, a negative electrode sheet, a battery device and an electric device. The battery cell comprises an electrode assembly, the electrode assembly comprises a negative electrode sheet, the negative electrode sheet comprises a negative electrode current collector and a negative electrode active layer arranged on at least one side of the negative electrode current collector, and the negative electrode active layer comprises a first negative electrode active layer and a second negative electrode active layer, wherein the first negative electrode active layer is arranged on at least one side of the negative electrode current collector, and the second negative electrode active layer is arranged on the side of the first negative electrode active layer away from the negative electrode current collector; and the first negative electrode active layer comprises a first graphite material and a silicon-based material, the second negative electrode active layer comprises a second graphite material, and the degree of graphitization of the second graphite material is greater than or equal to 90% and less than the degree of graphitization of the first graphite material, which is less than or equal to 96%.
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