基于库仑效率的退役锂离子动力电池储能梯次利用筛选

doi:10.19595/j.cnki.1000-6753.tces.L80419

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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.

Key words： Reutilization of retired lithium-ion battery coulombic efficiency logarithmic coordinate system cycle life

Received: 10 July 2018 Published: 29 July 2019

PACS:

TM912

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	Articles by authors
	Zheng Zhikun
	Zhao Guangjin
	Jin Yang
	Zhao Zhixing
	Gao Jinfeng

Cite this article:

Zheng Zhikun,Zhao Guangjin,Jin Yang等. The Reutilization Screening of Retired Electric Vehicle Lithium-Ion Battery Based on Coulombic Efficiency[J]. Transactions of China Electrotechnical Society, 2019, 34(zk1): 388-395.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L80419 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/Izk1/388

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