关于电动汽车锂离子电池模组热失控的仿真研究

Simulation study on thermal runaway of lithium-ion battery module during high-temperature heating

以电动汽车Ni55锂离子电池为研究对象,利用COMSOL Multiphysics仿真建模软件,建立高温加热热失控模型,模拟仿真了3.5 mm隔热片布置下锂离子电池模组的热失控过程,分析了其在仿真中表现出的热失控特性参数,研究了热失控时的峰值温度、内部材料变化及温度分布,对比模拟仿真与试验结果,证明了模型的可靠性,同时分析了热失控过程中副反应状态变量的变化,为高镍三元锂离子电池安全性研究提供相应的理论支持。

Taking Ni55 lithium-ion battery of electric vehicle as the research object,the thermal runaway model of high-temperature heating was established by using COMSOL Multiphysics multi physical field simulation modeling software.The thermal runaway process of lithium-ion battery module with 3.5 mm insulation sheet was simulated.The thermal runaway characteristic parameters of lithiumion battery module with 3.5 mm insulation sheet contact in the simulation of thermal runaway of high-temperature heating were analyzed,and the peak temperature,the change of internal materials and temperature distribution when thermal runaway was studied.The comparison between the simulation results and the test results proved the reliability of the model.Meanwhile,the change of side reaction state variables in the process of thermal runaway was also analyzed,providing corresponding theoretical support for the safety research of high nickel ternary lithium ion batteries.