The Health Parameter Estimation Method for LiFePO4 Battery Echelon Use

被引：0
|
作者：
Li X. [1 ]
Xu J. [1 ]
Hu Z. [1 ]
Song K. [1 ]
Zhu C. [1 ]
机构：
[1] School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2018年 / 33卷 / 01期
关键词：
Electrochemical battery model; LiFePO[!sub]4[!/sub] battery; Nonlinear least squares method; Terminal voltage analysis;
D O I：
10.19595/j.cnki.1000-6753.tces.161004
中图分类号：
学科分类号：
摘要：
The echelon use of aged batteries is one of the key issues after the development of electric vehicles, In this paper, LiFePO4 secondary 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 LiFePO4 battery health state evaluation, re-classification, and re-use. © 2018, Electrical Technology Press Co. Ltd. All right reserved.
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页码：9 / 16
页数：7
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