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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摘要锂离子电池的不一致性导致电池组的容量和寿命等指标显著小于电池单体,且该问题在梯次利用的应用场景下更为严重。电池组老化后,电池组内电池不一致性参数之间并非相互独立,而是相互耦合,因此造成电池组一致性建模困难,降低了电池组的能量利用率的估计精度。针对梯次利用电池筛选成组和成组后的状态评估,该文提出一种基于Copula理论的电池组一致性建模方法,同时实现了电池参数分布特性和参数间相关性的准确刻画。基于电池组一致性模型,提出一种电池组能量利用率估计方法,并进行实验验证,估计误差在1%以内。最后分析电池组能量利用率的影响因素,以指导电池组的优化成组和使用。

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	赵伟
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	姜研

关键词 ：锂离子电池组, 梯次利用, 一致性, 能量利用率

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

收稿日期: 2020-03-10

PACS:

TM911

基金资助:国家重点研发计划资助项目（2018YFB0905304）

通讯作者: 姜研,男,1991年生,博士,研究方向为锂离子电池管理与成组应用技术。E-mail:jiangyan3@sunwoda.com

作者简介: 赵伟,男,1981年生,博士,教授级高工,研究方向为先进电力储能集成及控制技术。E-mail:zh_solar@126.com

引用本文:

赵伟, 闵婕, 李章溢, 孙瑞, 姜研. 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[J]. 电工技术学报, 2021, 36(10): 2190-2198. Zhao Wei, Min Jie, Li Zhangyi, Sun Rui, Jiang Yan. Energy Utilization Efficiency Estimation Method for Second-Use Lithium-Ion Battery Packs Based on a Battery Consistency Model. Transactions of China Electrotechnical Society, 2021, 36(10): 2190-2198.

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