Study on Key Metrics of Maintenance of Cascade-Utilized Battery Storage System’s Consistency

When power battery is applied to storage system after decommissioned, compared to traditional new battery storage power station, the divergence problem of battery consistency is even more prominent which increases the maintenance difficulty. In this paper, we discussed the reason and manifestation of the divergence of battery consistency and conducted a sample test and data analysis toward the decommissioned LiFePO4 battery module of pure electric bus. We analyzed the reason of battery module’s capacity deterioration from the aspect of consistency, suggested some consistency metrics that are closely related to usable capacity and concluded a method for determining key metrics of maintenance of cascade-utilized battery consistency, and the method’s effectiveness has been verified via tests.