Abstract: To further understand the internal micro mechanism of battery thermal runaway, based on Fluent, this paper adopts the coupling method of ECM-thermal abuse model and numerical simulation method to study the thermal runaway spreading phenomenon of lithium battery under heating condition. The thermal runaway spread temperature field, thermal abuse reaction and heat production rate of lithium battery were analyzed. The results show that the temperature rise curve of battery thermal runaway has the same trend, and the reaction of anode and cathode with electrolyte is the key factor leading to the temperature rise of battery, which provides a reference for the safety design of battery thermal runaway.

Key words: Lithium battery; Thermal abuse model; Thermal spread analysis; Temperature field; Fluent

摘要： 为进一步了解电池热失控内部微观机理，论文基于 Fluent 采用 ECM-热滥用模型相互 耦合的方式，运用数值模拟的方法研究了锂电池在加热滥用条件下电池热失控蔓延现象，分 析了锂电池热失控蔓延温度场、热滥用反应及产热速率的变化。结果表明，电池热失控温升 曲线变化趋势一致，且正负极与电解质的反应是导致电池温度升高的关键因素，为电池热失 控安全性设计提供了参考。

关键词: 锂电池；热滥用模型；热蔓延分析；温度场；Fluent