Study on safety of power Li-ion battery based on puncturing experiments

doi:10.16265/j.cnki.issn1003-3033.2019.03.005

Abstract

Abstract: In order to study the safety performance of power Li-ion battery in puncturing, puncturing experiments of different depths and speeds were carried out on three kinds of common 18650-type Li-ion batteries (two kinds of them are positive cobalt acid lithium materials and the other ternary materials). During the puncturing process, surface temperature of the positive electrode of the battery was monitored to evaluate its risks for fire and explosion. The results show that the deeper the puncturing depth is, the higher the temperature-rise rate of Li-ion battery and fire risk will be, that when the puncturing depth is 100%, puncturing speed has little effect on the temperature rise of these two kinds of batteries using a cathode material, that the temperature-rise rates of the same kind of batteries are almost the same under different puncturing speeds, and that temperature of LiCoO₂ Li-ion battery rises faster and reaches higher than that of ternary materials Li-ion battery under the same puncturing speed.

Key words: Li-ion battery, puncturing, safety, temperature of positive electrode, fire

CLC Number:

X932

PENG Bo, LUO Qiongyao, ZHANG Yi, WANG Lifen, ZHAO Changzheng. Study on safety of power Li-ion battery based on puncturing experiments[J]. China Safety Science Journal, 2019, 29(3): 27-31.

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