Double-layer SOC and SOH Equalization Scheme for LiFePO4 Battery Energy Storage System using MAS Blackboard System

Abstract 26650 LiFePO4 battery, as an ideal energy storage battery, has the shortcomings of fast aging speed and large dispersion of aging trend. However, it is noted that the 26650 LiFePO4 battery with high aging trend dispersion shows the characteristics of grouping. Therefore, this paper proposes a SOC and SOH double-layer equalization scheme for such batteries based on a multiagent blackboard system(MABS) by utilizing such characteristics. On the basis of MABS, the battery units with similar SOH are clustered into a group by a hierarchical clustering algorithm. Then SOH balancing is performed by changing the depth of charge and discharge (DOD) between groups, and SOC balancing is performed within the group. MATLAB simulation results verify the effectiveness of the proposed scheme in ensuring the balance of battery charge and discharge and prolonging the life of the battery energy storage system(BESS).