Consistent Control for SOH of Energy Storage Batteries Based on Game Theory

The rapid development of new energy vehicles has brought new problems--how to deal with retired batteries. Although the use of retired electric vehicles (EVs) batteries in the energy storage system saves the cost, the state of health (SOH) of each battery is difficult to be consistent, which affects the life of the entire energy storage system. Therefore, this paper proposes a Nash equilibrium consistency control method based on the complete information game, which can adjust the adopted depth of discharge (DOD) based on the current SOH and expected SOH. As a result, the SOH eventually tends to be consistent. The influence of energy storage battery SOH on state of charge (SOC) consistency is fundamentally solved, which provides a theoretical basis for battery SOH consistency equalization. It improves the utilization rate of energy, prolongs the service life of the energy storage battery, and reduces the operating cost. Simulation results demonstrate the effectiveness of the proposed method.