A Layered Bidirectional Active Equalization Method for Retired Power Lithium-Ion Batteries for Energy Storage Applications

Yang Yang, Wenchao Zhu, Changjun Xie, Ying Shi, Furong Liu, Weibo Li and Zebo Tang
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Yang Yang: School of Automation, Wuhan University of Technology, Wuhan 430070, Hubei, China
Wenchao Zhu: School of Automation, Wuhan University of Technology, Wuhan 430070, Hubei, China
Changjun Xie: School of Automation, Wuhan University of Technology, Wuhan 430070, Hubei, China
Ying Shi: School of Automation, Wuhan University of Technology, Wuhan 430070, Hubei, China
Furong Liu: School of Automation, Wuhan University of Technology, Wuhan 430070, Hubei, China
Weibo Li: School of Automation, Wuhan University of Technology, Wuhan 430070, Hubei, China
Zebo Tang: DongFeng Motor Corporation Technical Center, Wuhan 430058, China

Energies, 2020, vol. 13, issue 4, 1-15

Abstract: The power from lithium-ion batteries can be retired from electric vehicles (EVs) and can be used for energy storage applications when the residual capacity is up to 70% of their initial capacity. The retired batteries have characteristics of serious inconsistency. In order to solve this problem, a layered bidirectional active equalization topology is proposed in this paper. Specifically, a bridge-type equalization topology based on an inductor is adopted in the bottom layer, and the distributed equalization topological structure based on the bidirectional BUCK-BOOST circuit is adopted in the top layer. State of charge (SOC) is used as the equalization target variable, and the bottom layer equalization algorithm based on a “partition” idea and route optimization is proposed. The static equalization experiments and charge equalization experiments are performed by the 12 retired batteries selected from an electric sanitation vehicle. The results show that the proposed equalization method can reduce the SOC difference between retired batteries and can effectively improve the inconsistency of the retired battery pack with a faster equalization speed.

Keywords: retired batteries; energy storage applications; layered bidirectional equalization; equalization algorithm (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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