A Novel Inductor-Based Active Battery Equalization Circuit and Group Balancing Strategy for Battery Storage Systems

As the load on power grids increases and the rise in renewable energy generation, the task of matching load and generation becomes increasingly challenging. Battery Storage Systems playing a crucial role in support distribution networks. However, inconsistencies among individual batteries can affect battery lifespan, increase storage costs, and pose safety risks. This paper proposes a novel battery equalization circuit based on inductors, which maintains the inductor current by utilizing the freewheeling diode of the MOSFET and the current discharge path during faults, thereby simplifying the design. Adjacent batteries share a set ofMOSFETs, which significantly reducing circuit costs. Additionally, the circuit can equalize adjacent batteries simultaneously, improving equalization speed. The proposed circuit and strategy are validated through theoretical analysis and simulation, demonstrating their effectiveness in achieving rapid and efficient battery equalization.