锂离子电池充放电过程声发射实验特征研究  

Research on acoustic emission characterization analysis of lithium batteries

作　　者：许金融 金佩剑[1] XU Jinrong;JIN Peijian(School of Emergency Science and Engineering,Jilin Jianzhu University,Changchun Jilin130118,China)

机构地区：[1]吉林建筑大学应急科学与工程学院,吉林长春130118

出　　处：《工业安全与环保》2024年第11期98-101,共4页Industrial Safety and Environmental Protection

摘　　要：锂离子电池在充放电过程的复杂电化学反应使得电池性能退化,导致电池使用容量减小。声发射技术作为一种精度高的无损检测方法可检测电池内部电极的变形行为。通过锂电池循环老化实验得到老化电池,与新电池进行多组充放电实验,收集充放电过程的声发射信号并分析。电池充放电过程中恒流充电阶段与放电第二阶段旧电池比新电池短,恒压充电阶段旧电池比新电池长。声发射信号主要在放电过程中稳定出现2个突发型波形,在放电过程中的电压稳定下降阶段中,锂电池的信号时间间隔与波形时间间隔都随着电压的降低而减小,相同放电倍率下老化电池的时间间隔大于新电池。The complex electrochemical reaction of lithium battery in the process of charging and discharging degra-des the performance of the battery,resulting in the reduction of the battery capacity.Acoustic emission technology is a high-precision non-destructive testing method that can detect the deformation behavior of the electrodes inside the battery.The aging battery was obtained through the lithium battery cycle aging experiment,and multiple sets of charge and discharge experiments were carried out with the new battery and the aging battery,and the acoustic emission sig-nals of the charge and discharge process were collected and analyzed.During the battery charging and discharging pro-cess,the constant current charging stage and the second stage of discharging the old battery are shorter than the new battery,and the old battery is longer than the new battery in the constant voltage charging stage.In the stage of stable voltage decline during the discharge process,the signal time interval and waveform time interval of lithium battery de-crease with the decrease of voltage,and the time interval of aging battery is larger than that of new battery at the same discharge rate.

关 键 词：电池安全 电池老化 声发射 信号时间间隔 波形时间间隔 

分 类 号：TM912[电气工程—电力电子与电力传动]