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Active Equalization Circuit and Control Design of Series Battery Pack Based on Single Inductance

The battery pack is built by a number of battery cells in series and parallel connection. The inconsistencies inhered in cells during the process of manufacturing and operation will inevitably lead to the reduced capacity, attenuated cycle life and failure of entire battery pack. To solve the inconsistence problems in simple and easy way, a single-inductor-based active balancing circuit topology for series battery packs is proposed in this paper. The balancing circuit includes a series battery pack, an energy storage inductor, and the switching network, battery management system, controller and one switch drive circuit. Based on the analysis of the working principle of the main circuit, an equilibrium control strategy based on SOC is further proposed. The simulation experiment validates the effectiveness of the proposed active balancing circuit and control method for the series battery pack with the main role of a single inductor.