A Method to Determine Characteristic Region of Negative Electrode with State of Charge for Lithium-Ion Battery
Shi Qionglin1, Guo Dongxu2, Yang Geng2, Zhu Guorong1, Kang Jianqiang3
1. School of Automation Wuhan University of Technology Wuhan 430070 China;
2. Department of Automation Tsinghua University Beijing 100084 China;
3. School of Automotive Engineering Wuhan University of Technology Wuhan 430070 China
There are a positive and a negative electrode in a commercial lithium ion batteries. The aging rates of the two electrodes are generally inconsistent. Take lithium iron phosphate batteries as an example, the negative electrode dominates the degradation in this battery. It is considerable to distinguish the characteristics of the negative electrode from the external characteristics of the battery, and then to find the relevant aging information from this characteristic curve to study the aging problem of lithium iron phosphate batteries without dismantling them. As first step of the work, It is necessary to determine the obvious characteristics’ SOC region of the curve which is called negative characteristic region in this paper. Based on the fractional-order model and the linear model of different State of charge (SOC) working point, this paper analyzes potential change of two electrodes under different SOC, and give a method to determine the negative characteristic region. Finally, the correlation between the region and the aging of the battery were analyzed. These results are verified by the three-electrode experiment, which indicates that this method has guiding significance for the on-line observation of the aging problem of commercial lithium iron phosphate battery.
石琼林, 郭东旭, 杨耕, 朱国荣, 康健强. 具有磷酸铁锂电池负极特征的SOC区间的确定方法[J]. 电工技术学报, 2020, 35(19): 4097-4105.
Shi Qionglin, Guo Dongxu, Yang Geng, Zhu Guorong, Kang Jianqiang. A Method to Determine Characteristic Region of Negative Electrode with State of Charge for Lithium-Ion Battery. Transactions of China Electrotechnical Society, 2020, 35(19): 4097-4105.
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2020, Vol. 35 
