Fast Equalization for Lithium Ion Battery Packs Based on Reconfigurable Battery Structure

This paper proposes a fast equalization method for lithium-ion battery packs based on reconfigurable battery structure and designs a new switching circuit topology. By adding PWM signals to the switching circuit, two internal structures of battery pack take turns to achieve the purpose of equalization. Without significantly increasing the number of switching devices, the complexity of the equalization strategy is greatly reduced. After equalization, the available capacity of the battery pack would be increased, the aging rate would be slowed down, and the service life would be prolonged. The detection circuit can ensure the safety performance of the battery pack and make the battery pack more intelligent. This proposed method is validated by the simulation results obtained from 16 battery cells in PSIM.