Battery assembly, preparation method thereof and battery

By incorporating a kaolin insulating frame into the solid-state battery, the problems of short circuits and insulating frame breakage caused by electrode size mismatch were solved, improving the structural stability and safety of the battery, extending battery life, and increasing energy density.

CN120999083APending Publication Date: 2025-11-21ZHEJIANG INTELLIGENT TRANSPORTATION TECHNOLOGY INNOVATION CENTER +1
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Patent Information

Application Number
CN202511193652.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-25
Publication Date
2025-11-21

AI Technical Summary

Technical Problem

Existing solid-state batteries suffer from short circuits due to electrode size mismatch during isostatic pressing, and the silicon anode expands in volume during cycling, causing the insulating frame to crack.

Method used

An insulating frame is set on the surface of the solid electrolyte layer using kaolin granules. The positive electrode active layer is set inside the insulating frame. The size difference is compensated by adjusting the width and thickness of the frame, and the structure is improved by combining it with an adhesive.

Benefits of technology

It effectively prevents short circuits and insulation frame cracking, enhances battery structural stability and safety, inhibits lithium dendrite growth, improves thermal management, extends battery life and increases energy density.

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Abstract

The invention relates to the field of solid-state batteries, in particular to a battery assembly and a preparation method thereof and a battery, the battery assembly comprises a current collector, a negative active layer, a solid electrolyte layer, an insulating frame and a positive active layer; the negative electrode active layer is arranged on at least one surface of the current collector in the thickness direction, the solid electrolyte layer is arranged on the surface, far away from the current collector, of the negative electrode active layer, and the insulating frame is arranged on the edge of the surface, far away from the negative electrode active layer, of the solid electrolyte layer; wherein the outer edge of the insulating frame is as large as the periphery of the solid electrolyte layer; the positive electrode active layer is arranged in an internal frame area of the insulating frame; the insulating frame is made of kaolin particles. The battery assembly can effectively prevent the short circuit phenomenon caused by the step problem of the solid-state battery and effectively prevent the cracking phenomenon of the insulating frame in the working process of the battery.
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