基于COMSOL的锂离子电池热失控仿真

基于COMSOL的锂离子电池热失控仿真摘要近年来，随着国家的号召和技术的不断发展，新能源电动汽车越来越受到人们的欢迎。然而，经常发生的因锂电池热失控导致的事故所造成的人员伤亡和经济损失，不仅阻碍了相关产业的商业化发展，而且对人们的日常生活和生命安全构成很大的威胁，人们对于电动车的安全性也越来越重视。因此，对锂电池的热失控研究分析具有非常重要的意义。本文以18650锂离子电池为对象，深入探讨了锂电池的热失控问题。通过使用COMSOL Multiphysics软件设置相关反应参数进行仿真模拟，构建了锂离子电池的热失控模型。借助软件模拟和相关资料的支持，结合热失控的机制和锂电池的工作原理，进一步研究了锂电池热失控的相关过程和影响因素。通过翻阅国内外的相关文献，可以深入了解锂离子电池热失控在国内外的研究进展。对锂离子电池的内部材料构成、工作机制等进行了深入的学习并进行描述，并对锂电池的生热和放热原理进行了研究，同时也对锂离子电池热失控的产生机制和产热机制进行了学习和研究。考虑到锂离子电池的几何尺寸和其他物理参数，通过这些参数使用COMSOLMultiphysics软件构建了18650锂离子电池的几何模型。结合热失控机制的深入研究，设定了副反应参数，并通过这些副反应参数建立了18650锂离子电池的热失控模型来研究外界因素和电池自身因素对热失控的影响。对构建的单体模型进行了电化学性能的模拟、热性能的分析以及热失控的影响因素的研究，特别是环境温度、传热系数和电池初始温度等因素对锂电池热失控的影响。关键词热失控：锂离子电池：COMSOL:温度变化Thermal runaway simulation of lithium-ionbattery based on COMSOLAbstractIn recent years,with the call of the country and the continuousdevelopment of technology,new energy electric vehicles are more and morewelcomed by people.However,the frequent casualties and economic lossescaused by accidents caused by thermal runaway of lithium batteries not onlyhinder the commercial development of related industries,but also pose a greatthreat to people's daily life and life safety.People also pay more and moreattention to the safety of electric vehicles.Therefore,it is of great significance toanalyze the thermal runaway research of lithium batteries.This paper takes 18650 lithium ion battery as the object and discusses thethermal runaway problem of lithium battery.The thermal runaway model oflithium ion battery is constructed by setting the relevant reaction parametersusing COMSOL Multiphysics software.With the support of software simulationand related data,combined with the mechanism of thermal runaway and theworking principle of lithium battery,the related process and influencing factorsof thermal runaway of lithium battery are further studied.By reading therelevant literature at home and abroad,we can deeply understand the researchprogress of thermal runaway of lithium ion battery at home and abroad.Theinternal material composition and working mechanism of lithium ion battery aredeeply studied and described,and the principle of heat generation and heatrelease of lithium battery is studied,and the production mechanism and heatproduction mechanism of thermal runaway of lithium ion battery are alsostudied and studied.Considering the geometric size and other physical-Ⅱ-parameters,a geometric model of the 18650 Li-ion battery was constructedusing the COMSOL Multiphysics software through these parameters.Combinedwith the in-depth study of the thermal runaway mechanism,the side reactionparameters are set,and the thermal runaway model of 18650 lithium ion batteryis established through these side reaction parameters to study the influence ofexternal factors and the battery itself factors on the thermal runaway.Theelectrochemical performance of the monomer model is simulated,the thermalperformance is analyzed and the thermal runaway are studied,especially theambient temperature,thermal transfer coeffi