锂电池的电化学建模研究  

Research on the Electrochemical Modeling of Lithium-ion Batteries

作　　者：梁新成[1] 张志冬 黄国钧 LIANG Xincheng;ZHANG Zhidong;HUANG Guojun(College of Engineering and Technology,Southwest University,Chongqing 400715,China;College of Artificial Intelligence,Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学工程技术学院,重庆400715 [2]西南大学人工智能学院,重庆400715

出　　处：《西南大学学报（自然科学版）》2023年第3期214-221,共8页Journal of Southwest University(Natural Science Edition)

基　　金：重庆市自然科学基金项目(cstc2021jcyj-msxmX1062)。

摘　　要：锂离子电池作为电动汽车重要的储能单元,在反复的充放电过程中出现性能衰退等老化现象不可避免.本质上锂电池完成的充放电过程是持续的电化学反应,因此基于电化学建模方法比等效电路方法更为精准和可靠.本文首先从理论上阐述了电化学建模的过程,然后应用COMSOL软件对模型进行了仿真,为验证仿真分析的可靠性,对18650锂离子电池进行了多个温度、倍率的充放电,将仿真数据与实验结果进行对比发现吻合较好,表明了电化学建模方法的可靠性较高.随着放电倍率的增大,仿真结果和实验数据吻合变差,如何在建模时考虑电池的老化、热耦合等因素以确保始终吻合良好是未来研究的内容.As an important energy storage unit of electric vehicles,performance degradation and other aging phenomena of lithium-ion battery are inevitable during the process of repeated charging and discharging.In essence,the charging and discharging process of lithium-ion battery is a continuous electrochemical reaction,so the electrochemical modeling method is more accurate and reliable than the equivalent circuit method.In this study,firstly,the process of electrochemical modeling was theoretically described,and then the model was simulated by COMSOL software.To verify the reliability of the simulation analysis,the 18650 lithium-ion battery was charged and discharged at multiple temperatures and rates,and the simulation results was compared with the experimental data.Since the simulation curve is in good agreement with the experimental data,it shows the reliability of the electrochemical modeling method.With the increase of discharging rate of current,the coincidence rate becomes worse.Consequently,aging and thermal coupling factors will be considered in the model to ensure a good coincidence rate as the content of future research.

关 键 词：锂离子电池 电化学建模 参数辨识 COMSOL软件 

分 类 号：TM912[电气工程—电力电子与电力传动]