Multiphase Interleaved Converter for Lithium Battery Active Balancing

In this paper, an innovative any cell(s) to any cell(s) active balancing converter for lithium battery stack management is presented. Based on multiphase converter legs connected to each lithium battery potential, it is able to transfer energy from any cell(s) to any cell(s). First, a basic “natural” balancing control strategy is presented. Then, based on the perspective of a high level of integration, an interleaved topology is proposed as an evolution of the converter for the downsizing of the passive components. It is explained how the large increase in the number of components is compensated by the high level of integration obtained for the given converter topology. Simulation and experimental results are provided to demonstrate the interest of the converter for active balancing of lithium-based battery stacks.