The Reutilization Screening of Retired Electric Vehicle Lithium-Ion Battery Based on Coulombic Efficiency
Zheng Zhikun1, Zhao Guangjin2, Jin Yang1, Zhao Zhixing1, Gao Jinfeng1
1. School of Electrical Engineering Zhengzhou University Zhengzhou 450001 China; 2. State Grid Henan Electric Power Research Institute Zhengzhou 450002 China
Abstract：Retired Lithium-ion batteries in electric vehicles have the potential to reuse in other energy storage systems. The accurate prediction of state of health (SOH) is of great significance. For better and quick screening healthy batteries for reutilization from numerous retired cells, this paper has come up with a screening method based on coulombic efficiency. Firstly the intrinsic electrochemical relationship between battery coulombic efficiency and capacity attenuation was analyzed. According to the consumption mechanism of reversible lithium ions during the charge-discharge cycles, coulombic inefficiency was introduced as a screening factor based on coulombic efficiency. The relationship between charge and discharge capacity, coulombic efficiency, and coulombic inefficiency with cycle times of two retired batteries (healthy and unhealthy) was obtained under same experimental conditions. The results demonstrate that healthy battery can be accurately screened out by coulombic inefficiency in logarithmic coordinate system, and this method was verified by cycle life test.
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2019, Vol. 34 
