Characteristic parameter analysis of thermal runaway early warning of lithium-ion battery

Abstract

Abstract: In order to support the early warning model of thermal runaway(TR) of lithium-ion battery, experiments were carried out focusing on the issues of battery cell TR by unilateral heating, to analyze the variation regularity of characteristic parameters such as battery surface temperature, voltage and gas temperature. The reasonable alarm range of the above parameters is analyzed base on the reduction of false or missing rate. Experimental results indicate that the determination of TR triggered by heating mainly depends on the battery surface temperature rise rate. And the battery voltage drop is inapplicable to TR warning. The reference alarm range of characteristic parameters such as battery surface temperature,surface temperature rise rate, voltage drop rate, gas temperature is 60~90℃,0.4~1℃/s,0.05~0.16V/s,60~90℃, respectively.

Key words: lithium ion battery, thermal runaway, early warning;temperature rise rate, voltage drop

LI Zhao, CHEN Cai-xing, NIU Hui-chang, LI Lei. Characteristic parameter analysis of thermal runaway early warning of lithium-ion battery[J]. Fire Science and Technology, 2020, 39(2): 146-150.

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Characteristic parameter analysis of thermal runaway early warning of lithium-ion battery

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