The two-stage sorting method for retired power battery modules based on multi-state coupling

doi:10.19799/j.cnki.2095-4239.2024.0843

Abstract

Abstract:

To effectively reduce the lifetime loss of retired power batteries and improve the consistency of functional states during the operation of battery modules, this paper proposes a multi-state coupled battery module screening method that considers the State of Energy (SOE), State of Health (SOH), and State of Power (SOP). Firstly, the basic electrical performance parameters of retired power batteries (such as capacity, voltage, internal resistance, etc.) are extracted, and a multi-state coupling characterization model for battery modules SOE, SOH, and SOP is established. Secondly, the SOE characteristics of battery modules are estimated, and the hierarchical utilization of battery module SOH consistency is predicted. An improved K-means clustering algorithm is used for the first stage of dynamic sorting of battery modules. Finally, a multi parameter SOP characterization model for battery module coupling is established, and the SOP deviation between batteries in the battery module is estimated. The battery module is dynamically sorted in the second stage. Through simulation case analysis, this method is verified to effectively improve the consistency of modules during the second utilization of retired power batteries, it also reduced system operational life loss. In addition, it provided a theoretical foundation for large-scale second utilization of energy storage systems.

Key words: Multi-state coupling, decommissioned power battery modules, two-stage sorting, improved K-means clustering, dynamic consistency

CLC Number:

TK01

Chunsheng Li, Shengchun Wang, Chi Song, Lihai Liu, Ning Yan. The two-stage sorting method for retired power battery modules based on multi-state coupling[J]. Energy Storage Science and Technology, doi: 10.19799/j.cnki.2095-4239.2024.0843.

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电池单体		电池模组
参数	值	参数	值
电池类型	方形钢壳电池	电压范围/V	2.0~3.8
电压范围/V	2.0~3.8	标称电压/V	3.2
标称电压/V	3.2	额定容量/Ah	80
额定容量/Ah	80	正极材料	磷酸铁锂
能量密度/(Wh/kg)	192	负极材料	石墨

筛选方法	集群离散度/%
筛选方法	集群1	集群2	集群3
K-means聚类	2.34	1.76	0.79
改进K-means聚类	2.06	1.19	0.66
离散提升度/%	11.97	32.39	16.46

误差区间	分组	电池模组编号
［0, 1.0%］	D1	C-2、C-3、C-4、C-5、C-7
［1.0%, 2.0%］	D2	C-1、C-6、C-9、C-10
超过2.0%	D3	C-8、C-11、C-12、C-13

考虑因素		循环次数
考虑因素		200	400
考虑SOP一致性/%	H1	77.29	66.67
	H2	77.75	66.53
	H3	78.37	66.21
不考虑SOP一致性/%		77.25	65.50

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