基于Comsol锂离子模组热失控及散热模型仿真

Simulation of Thermal Runaway and Heat Dissipation Model of Lithium Ion Module Based on Comsol

为探究多块串联三元软包锂离子电池模组热失控及热扩散的行为特征,基于能量守恒定律和传热机理,应用Comsol有限元软件建立电化学-热耦合模型并进行仿真。仿真结果表明,当电池单体发生热失控时,电池电压变化早于温度变化40 s,为采取阻燃控制措施预留了充分的时间;在第160 s时,边缘位置比中间位置电池触发热失控的温度高56℃;分析热对流对散热模型的影响,发现空气对流速度大于0.5 m/s时,电池最高温度小于200℃,不会触发热失控。

In order to investigate the behavior of thermal runaway and thermal diffusion of multiple series ternary soft packet Lithium-ion battery modules,an electrochemical-thermal coupling model is established by Comsol finite element software based on the law of energy conservation and heat transfer mechanism.The results show that when thermal runaway occurs,the battery voltage changes 40 s earlier than the temperature changes,so that adequate time is allowed for flame retardant control measures.At 160 s,the temperature at the edge position is 56℃higher than that at the middle position when the battery triggers thermal runaway.The influence of heat convection on the heat dissipation model is analyzed.It is found that when the air convection velocity is greater than 0.5 m/s,the maximum temperature of the battery is less than 200℃,and the heat runaway is not triggered.