Experimental study on the thermal runaway hazard quantification and its assessment parameters in the lithium-ion battery

Abstract

Thermal runaway (TR) is a thermal disaster in the lithium-ion battery (LIB). The TR hazard in the LIBs with different battery characteristic and under different TR triggering method is distinctive, and it is of great significance to quantify the TR hazard as a criterion for TR quantified suppression for its further development. This study has investigated the TR hazard assessment parameters (HAPs) in the batteries of different rated capacity Rc and battery number N under different TR triggering method, and raised a novel method for TR hazard quantification based on these HAPs. The results show: (1) under different triggering method, the HAPs are increased with the increase of overcharging rate Cr and the decrease of heating power Ph, but not explicit with the change of punching speed Ps, and increased with Rc in most cases; (2) the quantified TR hazard HTR-q is greater in the cases of overcharging and punching, and is 1.52 times greater in the confined space under the same case in the open space. Besides, The Rc and HTR-q form a quadratic function relationship, and N and HTR-q a linear relationship. Moreover, a computing model of HTR-q is proposed with the input of, self-characteristics of battery Sc and TR triggering intensity It, which exhibits the average error of 6 % approximately. This is expected to become a novel method in TR hazard assessment, and offer guidance on the setting of key parameters for TR suppression.