21700型NCA锂离子电池过放电循环老化及放电产热特性研究  

Research on Over-discharge Cycle Aging and Discharge Heat Generation Characteristics of 21700 NCA Lithium-ion Batteries

作　　者：王敬豪 李希超 贺群 戴作强[1] 郑莉莉 WANG Jing-hao;LI Xi-chao;HE Qun;DAI Zuo-qiang;ZHENG Li-li(College of Mechanicaland Electronic Engineering,Qingdao University,Qingdao 266071,China)

机构地区：[1]青岛大学机电工程学院,青岛266071

出　　处：《青岛大学学报（自然科学版）》2024年第3期76-81,99,共7页Journal of Qingdao University(Natural Science Edition)

基　　金：青岛市博士后应用研究项目(40518060027)资助。

摘　　要：针对21700型NCA锂离子电池开展不同放电截止电压的循环老化实验,利用电化学阻抗谱和差分电压分析法,研究锂离子电池在过放电循环条件下的老化机制,并测得绝热环境中过放电电池在放电过程中的最高温度、产热量、最大产热功率和平均产热功率。研究结果表明,过放电循环会导致电池加速老化,锂离子存量损失是电池过放电循环最主要的老化模式;经历过放电循环老化后,电池放电过程中的最高产热功率和平均产热功率均有明显提升。The cycle aging experiment of different discharge cut-off voltages was conducted on 21700 NCA lithium-ion batteries.The aging mechanism of lithium-ion batteries under over-discharge cycles conditions was investigated using electrochemical impedance spectroscopy and differential voltage analysis,and the maximum temperature,heat output,maximum heat generation power,and average heat generation power of the over-discharged batteries during discharge were measured in an adiabatic environment.The research findings indicate that over-discharge cycles accelerate battery aging,with loss of lithium inventory as the primary aging mode during over-discharge cycles,following the over-discharge cycles aging process,both the maximum heat generation power and average heat generation power during battery discharge show a noticeable increase.

关 键 词：锂离子电池 过放电 电化学阻抗谱 差分电压分析 电池产热 

分 类 号：TM911.3[电气工程—电力电子与电力传动]