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A novel fast capacity estimation method based on current curves of parallel-connected cells for retired lithium-ion batteries in second-use applications
Journal of Power Sources ( IF 9.2 ) Pub Date : 2020-03-27 , DOI: 10.1016/j.jpowsour.2020.227901
Long Chang , Chunyu Wang , Chenghui Zhang , Linjing Xiao , Naxin Cui , Hongyu Li , Jianfeng Qiu

Retired lithium-ion batteries from electric vehicles provide considerable social, economic and environmental benefits in second-use applications especially for energy storage. However, the effective capacity estimation is a key technique and difficulty for second-life of large-scale retired cells. To address the issue, this paper provides a fast novel capacity estimation method from a new perspective of current distribution within parallel-connected cells. Firstly, using the parallel-connected cells analytical model, the correlation between capacity and current distribution is deduced. According to the correlation, the capacity of each cell is simultaneously estimated for the n parallel-connected cells by measured the current curves in only one complete discharge cycle, which is more efficient than one after another. Then an experimental device and procedure are designed to verify the method. Results demonstrate that the method is feasible and accurate. Meanwhile, through comparing the results of packs with three different battery types, the main factors affecting accuracy are found including open circuit voltage, parameter difference of cell and loads. Finally, comparison of different methods shows that the method has the advantages of high efficiency, low calculation, low accumulative errors and good consistency of state-of-charge, which is helpful for regrouping of retired cells and promoting second-life battery applications.



中文翻译:

一种基于并联电池电流曲线的二次使用退役锂离子电池快速容量估计新方法

在二手应用中,特别是在储能方面,电动汽车退役的锂离子电池可提供可观的社会,经济和环境效益。然而,有效容量估计是关键技术,并且是大规模退休细胞的第二寿命的困难。为了解决这个问题,本文从并联电池内电流分布的新角度提供了一种快速的新型容量估算方法。首先,使用并联电池分析模型,推导了容量与电流分布之间的相关性。根据相关性,同时估计n个电池的每个电池的容量。通过仅在一个完整的放电周期中测量电流曲线,即可测量并联电池的效率,这比一个接一个的效率更高。然后设计了实验装置和程序来验证该方法。结果表明该方法是可行和准确的。同时,通过比较三种不同类型电池组的结果,发现影响精度的主要因素包括开路电压,电池单元和负载的参数差异。最后,通过对不同方法的比较,表明该方法具有效率高,计算量少,累积误差小,荷电状态一致性好等优点,有利于对报废电池进行重组,促进二次电池的应用。

更新日期:2020-03-28
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