Multiphase interleaved converter for lithium battery active balancing

In this paper, a simple and flexible active balancing converter for lithium battery stack management is presented. Based on multiphase inverter legs connected at each lithium based battery potential, it is able to transfer energy from any cell(s) to any cell(s). A simple "natural" balancing control strategy is presented. Then, based on the high level of integration, an interleaved evolution of the converter is proposed for the downsizing of the passive components. Simulation and experimental results are provided to demonstrate the interest of the converter for active balancing of lithium based battery stacks.