Study on early warning strategy of large LFP traction battery's thermal runaway

doi:10.16265/j.cnki.issn 1003-3033.2021.11.017

Abstract

Abstract: In order to explore thermal runaway warning method of LFP traction batteries, thermal runaway characteristics triggered by external heating and over charging of large LFP traction batteries for commercial use were experimentally studied in large test containers for lithium-ion batteries. Secondly, a three-stage early warning strategy composed of battery temperature, characteristic gas, smoke and volatile organic compounds (VOC) sensor signals was developed according to thermal runway parameters, and then was tested through a verification experiment. The results show that there are a series of stable phenomena in thermal runaway process of these LFP batteries, and several parameters can be employed for early warning. Using this graded warning strategy can monitor safety states of LFP batteries in real time, and an alert can be sent out 15 minutes in advance, providing more time for emergency prevention and control.

Key words: lithium iron phosphate (LFP), large capacity, traction battery, thermal runaway, early warning strategy

CLC Number:

X932

LIU Tongyu, LI Shi, FU Weidong, DUAN Qiangling, SUN Jinhua, WANG Qingsong. Study on early warning strategy of large LFP traction battery's thermal runaway[J]. China Safety Science Journal, 2021, 31(11): 120-126.

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