Solid-state battery cell and preparation method therefor, battery device, and electric device

By wrapping the electrode assembly with heat-shrink film and sealing the edges, followed by isostatic pressing, the problem of negative electrode undercoating peeling off during the removal of the isostatic pressing film in solid-state battery cells without negative electrodes is solved, thereby improving the electrochemical performance and cycle performance of the battery cells.

WO2026123546A1 Publication Date: 2026-06-18CONTEMPORARY 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
2025-04-25
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

How to improve the cycle performance of battery cells, especially to reduce the risk of the negative electrode undercoating peeling off during the removal of the isostatic film in solid-state battery cells without negative electrodes, thereby improving electrochemical performance.

⚗Method used

The electrode assembly is covered with heat-shrink film and fixed by sealing the edges, and then subjected to isostatic pressing. This allows the heat-shrink film to continue to provide a tight hold after the isostatic pressing film is removed, ensuring that the electrode assembly remains in a dense state.

🎯Benefits of technology

It effectively reduces the risk of the negative electrode undercoating peeling off and improves the electrochemical performance and cycle performance of the battery cells.

✦ Generated by Eureka AI based on patent content.

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Abstract

Disclosed in the present application are a solid-state battery cell and a preparation method therefor, a battery device, and an electric device. The preparation method for a solid-state battery cell comprises: separately providing an electrode assembly and a heat-shrinkable film, wherein the electrode assembly comprises a main body portion and a tab portion extending from the main body portion, the main body portion comprises a positive electrode sheet, a solid-state electrolyte membrane and a negative electrode sheet that are stacked, the solid-state electrolyte membrane is located between the positive electrode sheet and the negative electrode sheet, and the negative electrode sheet comprises a negative electrode current collector and a primer layer located on the surface of at least one side of the negative electrode current collector; folding the heat-shrinkable film in half to wrap the main body portion, and performing edge sealing and fixation on the side edges of the folded heat-shrinkable film; and performing an isostatic pressing treatment on the electrode assembly to shrink the heat-shrinkable film and secure the main body portion. The battery cell prepared by the method provided in the present application exhibits an improved cycle performance.
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