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Rate Dependence of Cell-to-Cell Variations of Lithium-ion Cells

发布时间:2017-02-10 浏览次数:


Fuqiang An#, Lufan Chen, Jun Huang, Jianbo Zhang*, Ping Li*, Rate Dependence of Cell-to-Cell Variations of Lithium-ion Cells, Scientific Report, 2016, 6: 35051
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【Abstract】Lithium-ion cells are commonly used in a multicell configuration in power devices and electric vehicles,  making the cell-to-cell variation (CtCV) a key factor to consider in system design and management. 
Previous studies on CtCV have two major limitations: the number of cells is usually less than one  hundred, and the cells are usually commercial cells already subjected to cell-screenings. In this  article, we first make a statistical analysis on the CtCV of 5473 fresh cells from an automotive battery  manufacturer before the cell-screening process. Secondly, 198 cells are randomly selected from these  5473 cells and the rate dependence of the CtCV is examined, focusing on the correlations of capacity  versus weight and capacity versus resistance, corresponding to thermodynamic and kinetic factors,  respectively. The rate dependence of these two correlations is explained from a phenomenological  model. Finally, eight cells from the 198 cells are further characterized with electrochemical impedance  spectroscopy method to elucidate the kinetic origins of the CtCV.
 

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