基于一致性模型的梯次利用锂离子电池组能量利用率估计方法

doi:10.19595/j.cnki.1000-6753.tces.200243

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Abstract The inconsistency of lithium-ion battery cells has caused the lifetime and capacity of the battery pack to be much smaller than that of the battery cells, and this problem is more serious in the second-use applications. Along with the aging of the battery pack, the battery consistency parameters are mutual dependent, which causes battery pack consistency modeling difficult and state of health estimation inaccurate. Aiming at the grouping and the state evaluation stages of second-use batteries, this paper proposes a Copula-based battery pack consistency modeling method. The proposed method can describe the statistical characteristics of the battery consistency parameters and the dependence structure between parameters. Based on the consistency model, a battery pack energy utilization efficiency (EUE) estimation method is put forward and verified by experiments. The estimation error is within 1%. Finally, the influencing factors of EUE is analyzed to guide the optimal grouping and operation of second-use lithium-ion battery packs.

Key words： Lithium-ion battery pack second use consistency energy utilization efficiency

Received: 10 March 2020

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TM911

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	Articles by authors
	Zhao Wei
	Min Jie
	Li Zhangyi
	Sun Rui
	Jiang Yan

Cite this article:

Zhao Wei,Min Jie,Li Zhangyi等. Energy Utilization Efficiency Estimation Method for Second-Use Lithium-Ion Battery Packs Based on a Battery Consistency Model[J]. Transactions of China Electrotechnical Society, 2021, 36(10): 2190-2198.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.200243 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I10/2190

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