MULTILAYER COMPOSITE STRUCTURE FOR PACKAGING LITHIUM ION BATTERY AND PREPARATION METHOD THEREOF AND LITHIUM ION BATTERY

Abstract: a multilayer composite structure for packaging a lithium ion battery and a preparation method thereof and a lithium ion battery are provided. the multilayer composite structure includes mutually-attached inner-layer connection layer film and outer-layer framework structure layer film, which both contain a water-blocking additive. in the existing external layered products, a composite structure of three or more layers is usually adopted, which includes an outer layer with high mechanical strength, a middle layer capable of preventing water vapor invasion, an inner layer having good thermal bonding performance, and a transition layer therebetween. the multilayer composite structure simplifies this structure, where a water-blocking additive is used to replace a metal aluminum foil to prevent invasion of the water vapor, and by using the characteristics of good compatibility of the outer layer and inner layer, the construction processes and costs are reduced, so as to increase to the safety performance.

Inventor(s): Yuheng TANG, Yanpeng FENG

CPC Classification: H01M50/141 (for protecting against humidity)

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