基于OCV-SOC曲线簇的磷酸铁锂电池SOC估算研究  

Research on SOC estimation of LiFePO4 battery based on OCV-SOC curve cluster

作　　者：郭宝甫[1] 张鹏[1] 王卫星[1] 王法宁 GUO Bao-fu;ZHANG Peng;WANG Wei-xing;WANG Fa-ning(XJ Group Corporation, Xuchang Henan 461000, China)

机构地区：[1]许继集团有限公司

出　　处：《电源技术》2019年第7期1125-1128,1139,共5页Chinese Journal of Power Sources

基　　金：国家电网公司总部科技项目(SGTYHT/17-JS-199)

摘　　要：通过对3.2 V/72 Ah能量型磷酸铁锂电池进行充放电试验,研究不同充放电倍率下的开路电压(OCV)与荷电状态(SOC)的关系。根据磷酸铁锂电池在静置状态下的电压滞回特性,构建了不同静置时间下的OCV-SOC曲线簇,并利用傅里叶高阶拟合和差值法建立电池OCV-SOC不同静置时间下的校正数据表,该数据表将对提高电池管理系统SOC估算精度具有较强的可行性和实用性。Based on the charging and discharging test of 3.2 V/72 Ah energy of LiFePO4 battery, the relationship between open circuit voltage and state of charge was studied under different charge-discharge rate. According to the voltage hysteresis characteristics of LiFePO4 battery under static state, the OCV-SOC curve cluster was built under different static time, and the OCV-SOC correction data sheet under different static time was established by Fourier higher-order fitting method and interpolation method. The data sheet has strong feasibility and practicability for improving the SOC estimation accuracy of battery management system.

关 键 词：磷酸铁锂电池 开路电压 荷电状态 OCV-SOC曲线簇 

分 类 号：TM912.9[电气工程—电力电子与电力传动]