Performance Correlation and Temperature Applicability of Li-ion Batteries under Different Range Degradation Paths
Sun Bingxiang1, Liu Jia1, Han Zhiqiang2, Ren Pengbo1, Zhang Weige1
1. National Active Distribution Network Technology Research Center Collaborative Innovation Center of Electric Vehicles in Beijing Beijing Jiaotong University Beijing 100044 China; 2. Beijing Electric Vehicle Co. Ltd Beijing 100176 China
Abstract：The performance of li-ion battery is different under different capacity ranges and stress conditions. In this paper, lithium ion battery of composite material was taken as the research object, and the cycle range was divided based on the electrochemical phase change mechanism. A total throughput of 600 cycle tests was performed in the divided ranges and the whole range. Based on the performance degradation results in the cycle of different capacity ranges, the regression parameter analysis method was used to establish the characteristic parameter correlation model of lithium ion battery, including the correlation of cumulative capacity degradation rate, the correlation of cumulative internal resistance degradation rate and the correlation between them. The fitting goodness of the models are above 95%. Furthermore, the models were extended to a wider temperature range, and the applicability of the models was quantitatively analyzed. The results show that the correlation model of cumulative capacity degradation rate is very applicable at different temperatures. However, the applicability of the cumulative internal resistance correlation model and the correlation model between the two parameters are weak. The evolution law of internal resistance and capacity under different degradation paths provides a basis for the selection of the cycle range of li-ion batteries, and also provides a new idea for degradation prediction under different conditions.
孙丙香, 刘佳, 韩智强, 任鹏博, 张维戈. 不同区间衰退路径下锂离子电池的性能相关性及温度适用性分析[J]. 电工技术学报, 2020, 35(9): 2063-2073.
Sun Bingxiang, Liu Jia, Han Zhiqiang, Ren Pengbo, Zhang Weige. Performance Correlation and Temperature Applicability of Li-ion Batteries under Different Range Degradation Paths. Transactions of China Electrotechnical Society, 2020, 35(9): 2063-2073.
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2020, Vol. 35 
