Research on consistency evaluation and control strategy of a retired power battery
DOI：DOI: 10.19783/j.cnki.pspc.201659
Key Words:echelon utilization  application scenarios  state of charge  consistency  sorting technology
Author NameAffiliation
LI Jianlin1 1. Energy Storage Technology Engineering Research Center (North China University of Technology), Beijing 100144, China
2. State Grid Energy Research Institute Co., Ltd., Beijing 102209, China 
LI Yaxin1 1. Energy Storage Technology Engineering Research Center (North China University of Technology), Beijing 100144, China
2. State Grid Energy Research Institute Co., Ltd., Beijing 102209, China 
HUANG Bibin2 1. Energy Storage Technology Engineering Research Center (North China University of Technology), Beijing 100144, China
2. State Grid Energy Research Institute Co., Ltd., Beijing 102209, China 
YAN Hu2 1. Energy Storage Technology Engineering Research Center (North China University of Technology), Beijing 100144, China
2. State Grid Energy Research Institute Co., Ltd., Beijing 102209, China 
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Abstract:Battery echelon utilization is one of the effective means to reuse a number of retired power batteries. Research on the echelon utilization of decommissioned batteries is mainly carried out from two aspects: the distribution characteristics of key parameters of the retired battery SOC and the analysis of the consistency control strategy. This paper proposes an active and passive coordination balance strategy to consider the correlation of battery parameters. This makes up for the shortcomings of a single balance method, improves the reliability of charge and discharge balance control, and achieves the optimization of balance efficiency. It analyzes the mathematical model of the state of charge of decommissioned power batteries including the state of charge of different types. Then the state of charge control strategy of the decommissioned power battery in an energy storage system is researched. Multiple groups of decommissioned batteries are analyzed based on the active and passive coordinated balance strategy for the SOC consistency of the energy storage. This is helpful for perfecting the use of consistency sorting technology for retired batteries. This work is supported by the Beijing Natural Science Foundation (No. 21JC0026) and the Project of State Grid Energy Research Institute Co., Ltd. (No. SGTYHT/19-JS-218).
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