An improved relative integral capacity-K-means clustering method for capacity pre-sorting of decommissioned power batteries.

Xu, Xuntao; Wang, Shunli; Liu, Donglei; Fernandez, Carlos; Blaabjerg, Frede

Abstract

Capacity sorting is the primary prerequisite for the stepwise utilization of decommissioned power batteries. This study proposes an improved relative integral capacity-K-means clustering (RIC-KMC) method for preliminary sorting of decommissioned power battery capacity. Firstly, according to the electrochemical aging characteristics of decommissioned power batteries, combined with the ampere-time integration algorithm, a new lossless extraction method of the capacity characteristics of Lithium-ion batteries based on the segment voltage is proposed. Second, to minimize the interference of environmental factors and sampling errors on the charging capacity, the relative amount of charging capacity is introduced. Finally, to complete the capacity sorting before the ladder utilization, an improved RIC-KMC method is proposed, which combines the electrochemical aging feature values of decommissioned power batteries extracted from the segment voltage charging capacity with the K-means clustering algorithm. Using three sets of battery charging and discharging data to validate the sorting algorithm, the capacity sorting errors are reduced by 0.926%, 12.381%, and 10.185%, respectively, which verification the validity of the proposed RIC-KMC method. This study provides a new solution for capacity pre-sorting of decommissioned power batteries for stepwise utilization.

Citation

XU, X., WANG, S., LIU, D., FERNANDEZ, C. and BLAABJERG, F. 2024. An improved relative integral capacity-K-means clustering method for capacity pre-sorting of decommissioned power batteries. Journal of physics: conference series [online], 2853: proceedings of the 7th International conference on mechanical, electric and industrial engineering, 21-23 May 2024, Yichang, China, article number 012057. Available from: https://doi.org/10.1088/1742-6596/2853/1/012057

• Presentation Conference Type: Conference Paper (published)
• Conference Name: 7th International conference on mechanical, electric and industrial engineering
• Start Date: May 21, 2024
• End Date: May 23, 2024
• Acceptance Date: Sep 16, 2024
• Online Publication Date: Oct 16, 2024
• Publication Date: Dec 31, 2024
• Deposit Date: Oct 21, 2024
• Publicly Available Date: Oct 21, 2024
• Journal: Journal of physics: conference series
• Print ISSN: 1742-6588
• Electronic ISSN: 1742-6596
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 2853
• Article Number: 012057
• Series ISSN: 1742-6596
• DOI: https://doi.org/10.1088/1742-6596/2853/1/012057
• Keywords: Power batteries; Capacity; Segment voltage charging capacity
• Public URL: https://rgu-repository.worktribe.com/output/2537355