基于单频阻抗的锂离子电池热失控分级预警  

Thermal runaway graded warning of Li-ion battery based on single-frequency impedance

作　　者：田爱娜 潘壮壮 吴铁洲[1] 姜久春 TIAN Aina;PAN Zhuangzhuang;WU Tiezhou;JIANG Jiuchun(Hubei Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System,Hubei University of Technology,Wuhan,Hubei 430068,China)

机构地区：[1]湖北工业大学太阳能高效利用及储能运行控制湖北省重点实验室,湖北武汉430068

出　　处：《电池》2024年第2期194-199,共6页Battery Bimonthly

基　　金：国家自然科学基金(52177212);湖北省自然科学基金创新群体(2023AFA033);湖北省教育厅科学研究计划(T2021005)。

摘　　要：潜在的热失控风险,特别是过充电,可能会引发锂离子电池的安全事故。以电化学阻抗谱(EIS)为基础,采用单频阻抗X_(1Hz)和X_(400Hz)实现电池内部阻抗的实时检测。在不同充电倍率、环境温度和健康状态下进行验证,特征阻抗表现出很好的稳定性。基于X_(1Hz)和X_(400Hz)的单频阻抗,提出一种热失控安全分级预警方法,并验证该方法的可靠性。该方法的最后一级预警可在热失控前5 min以上发出安全预警。The potential risk of thermal runaway,especially overcharging,may lead to safety accidents of Li-ion battery.Based on electrochemical impedance spectroscopy(EIS),the real-time detection of internal battery impedance is achieved by employing single-frequency impedance at X_(1Hz)and X_(400Hz).After validation under different charging rates,environmental temperatures and states of health,the characteristic impedance demonstrates remarkable stability.Utilizing single-frequency impedance at X_(1Hz)and X_(400Hz),a thermal runaway safety classification and warning method is proposed,its reliability is verified.The final-stage warning of this method can issue a safety warning more than 5 min before thermal runaway.

关 键 词：锂离子电池 电化学阻抗谱(EIS) 单频阻抗 热失控 分级预警 

分 类 号：TM912.9[电气工程—电力电子与电力传动]