基于区域直线距离的锂离子电池健康状态评估  

Health status estimation of lithium-ion batteries based on regional linear distance

作　　者：胡厚鹏 刘伟 肖艳红 欧家祥 王力立 HU Houpeng;LIU Wei;XIAO Yanhong;OU Jiaxiang;WANG Lili(Guizhou Power Grid Co.,Ltd.,Guiyang 550002,Guizhou Province,China)

机构地区：[1]贵州电网有限责任公司,贵州贵阳550002

出　　处：《化学工程》2024年第5期25-32,共8页Chemical Engineering(China)

基　　金：贵州省科技支撑计划(黔科合支撑[2022]一般015);南方电网创新项目(GZKJXM20220036)。

摘　　要：在原始充电曲线中引入区域电压和区域直线距离的概念,并提出基于区域直线距离的电池S_(OH)(健康状态)评估方法,采用实验室条件下NCA(镍钴铝)电池单体和LFP(磷酸铁锂)电池模组在1/2C倍率下的充电电压数据以及一座20 kW/100 kW·h储能电站的电池运行数据,来建立基于区域直线距离的电池S_(OH)评估模型,对比了基于区域直线距离L_(AB)的方法和IC(增量容量)峰高法,并考察了不同采样频率和区域电压下L_(AB)-S_(OH)模型的效果。结果表明:S_(OH)与L_(AB)呈线性正相关,线性拟合优度可达到0.96以上,L_(AB)-S_(OH)模型的S_(OH)评估准确性均优于IC峰高法。区域直线距离作为健康因子提高了低采样频率下电池S_(OH)评估的准确性,这为工程上储能电池的S_(OH)在线评估提供了可能性。The concepts of regional voltage and regional linear distance in the original charging curve were introduced and a battery S_(OH)(state of health)estimation method based on regional linear distance was proposed.The battery S_(OH)estimation models based on regional linear distance were established by using the charging voltage data of laboratory NCA(nickel-cobalt-aluminum)battery cell and LFP(lithium iron phosphate)battery module at 1/2C-rate and the battery operation data of a 20 kW/100 kW·h energy storage power station.The method based on regional linear distanceL_(AB)and the IC(incremental capacity)peak height method was compared,the results ofL_(AB)-S_(OH)models under different sampling frequencies and regional voltages were also discussed.The results show that S_(OH)andL_(AB)have a linear positive correlation,and the linear goodness of fit can reach more than 0.96.The accuracy of S_(OH)evaluation ofL_(AB)-S_(OH)models is better than that of IC peak height method.Regional linear distance as a health factor improves the accuracy of battery S_(OH)evaluation at low sampling frequency,which provides the possibility for online evaluation of battery S_(OH)in engineering.

关 键 词：镍钴铝电池单体 磷酸铁锂离子电池模组 储能电站 区域直线距离 采样频率 S_(OH)评估 

分 类 号：TM912[电气工程—电力电子与电力传动]