Research on thermal runaway expansion barrier technology of NCM power battery

doi:10.16265/j.cnki.issn1003-3033.2020.03.005

Abstract

Abstract: In order to effectively control thermal runaway expansion of high energy density lithium ion batteries (LIBs), a composite barrier technology was proposed. With soft NCM811 battery as research object, existing fire prevention and control method of LIBs was analyzed and relationship between surface temperature and thermal runaway trigger time was determined by studying its thermal runaway characteristics. Then, thermal insulation tests for materials of different microstructures and sizes, represented by aerogels, asbestos and rock wool, were conducted to determine relationship between microstructure size and thermal barrier characteristics. Finally, thermal resistance characteristics of different barrier schemes were studied through thermal isolation tests with different thickness and number of layers. The results show that the smaller microstructure of barrier material is (less than 70 nm of average free path of air molecules), the thinner it is, and the more layers and better thermal barrier effect it has.

Key words: high specific energy, nickel cobalt manganese (NCM) power battery, thermal runaway expansion, safety barrier technology, fire

CLC Number:

X932

ZHANG Shaoyu, XIAN Xuelei, DONG Haibin, LI Yi, YU Dongxing. Research on thermal runaway expansion barrier technology of NCM power battery[J]. China Safety Science Journal, 2020, 30(3): 28-34.

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