电工技术学报2018，Vol.33Issue(1)：9-16,8.DOI:10.19595/j.cnki.1000-6753.tces.161004
磷酸铁锂电池梯次利用健康特征参数提取方法
The Health Parameter Estimation Method for LiFePO4Battery Echelon Use
摘要
Abstract
The echelon use of aged batteries is one of the key issues after the development of electric vehicles,In this paper,LiFePO4secondary battery is regard as the research object,based on the pseudo-two-dimensional electrochemical reaction mechanism model, the battery terminal voltage is simulated and analyzed under different charge-discharge rate and working conditions, it can be concluded that the over-potential of battery terminal voltage is approximate constant under the low constant current or pulse current working condition. Based on this phenomenon, the method for the battery health status characteristic parameters extraction is designed. Firstly, the battery capacity parameters are estimated based on the nonlinear least squares method under the low rate constant charge-discharge current. Then, combined with battery open circuit voltage and internal impedance estimation method, the extraction of battery impedance characteristic and capacity characteristics parameters under pulse conditions are realized. Finally, the method is verified by the experiments, this article can provide a basis method for LiFePO4battery health state evaluation, re-classification, and re-use.关键词
磷酸铁锂电池/电化学模型/端电压成分分析/非线性最小二乘法Key words
LiFePO4battery/electrochemical battery model/terminal voltage analysis/nonlinear least squares method分类
信息技术与安全科学引用本文复制引用
李晓宇,徐佳宁,胡泽徽,宋凯,朱春波..磷酸铁锂电池梯次利用健康特征参数提取方法[J].电工技术学报,2018,33(1):9-16,8.基金项目
国家电网公司科技项目资助([2013]384). （[2013]384）
