为了研究锂离子电池组在高温环境下热失控的特性，基于能量守恒及副反应生热方程，建立了锂离子电池组的三维数值模型，模拟电池组内部的温度分布、热量传递及副反应产热等关键物理过程，分析了环境温度、传热系数、初始温度等参数对锂离子电池组热失控的影响。研究结果表明，随着环境温度升高，电池模组内部因化学反应速率加快而产生更多的热量。当环境温度达到140 ℃，传热系数为10、15、25 W/（m²·K）时，这些反应释放的热量开始呈量级变大，导致发生热失控；更进一步，当环境温度为170 ℃，且传热系数为5、25 W/（m²·K）时，电池模组分别在16 200、4 600 s左右发生热失控，热失控顶峰温度为375 ℃左右；当环境温度为170 ℃，初始温度为20、100 ℃时，电池模组分别在9 280、3 980 s左右发生热失控，热失控顶峰温度为380 ℃左右，说明在高温环境下初始温度越高和传热系数越大，发生热失控的时间越早，但初始温度及传热系数对热失控顶峰温度影响都不大。

In order to study the thermal runaway characteristics of lithium-ion battery modules in high temperature environment，based on the equation of energy conservation and the heat generation equation of side reactions，a three-dimensional numerical model of lithium-ion battery modules was established，and key physical processes such as temperature distribution，heat transfer，and heat generated by the side reactions within the battery modules were simulated，and the effect of parameters such as ambient temperature，heat transfer coefficient，initial temperature on the thermal runaway of lithium-ion battery modules was analyzed.The results showed that as the ambient temperature rised，more heat was generated inside the battery modules due to the accelerated rate of chemical reactions.When the ambient temperature reached 140 ℃，with heat transfer coefficients of 10 W/（m²·K），15 W/（m²·K） and 25 W/（m²·K），the heat of these reactions became quantitatively larger，and leaded to the occurrence of thermal runaway of the battery.Further，when the ambient temperature was 170 ℃，the heat transfer coefficients were 5 W/（m²·K） and 25 W/（m²·K），the thermal runaway of the battery module occured around 16 200 s and 4 600 s，respectively，and the peak temperature of thermal runaway was around 375 ℃.When the ambient temperature was 170 ℃，the initial temperature was 20 ℃ and 100 ℃，the thermal runaway of the battery modules occured around 9 280 s and 3 980 s，respectively，and the peak temperature of the thermal runaway was around 380 ℃.It showed that under the high temperature environment，the higher of the initial temperature and the higher of the heat transfer coefficient，the earlier thermal runaway occured，but both the initial temperature and the heat transfer coefficient had little effect on the peak temperature of the thermal runaway.