A Novel Battery Equalizer for Plug-in Hybrid Electric Vehicle

Abstract

In order to meet cost targets for hybrid electric (HEV), Plug-in hybrid electric (PHEV), and all-electric vehicles (EV), an improvement in the battery life cycle and safety is essential. One practical approach to improve performance is to use power electronics intensive cell equalizer, in conjunction with on-board energy storage devices. A new technique based on buck-boost topology to equalize a series-connected battery stack on PHEV is proposed in this paper. The proposed scheme transfers the energy from fully charged cell to the weaker charged cell. Unlike previous battery equalizing schemes was based on terminal voltage, the proposed scheme is based on the THEVENIN model parameters, resulting more precisely and more available energy. Experiment results are provided to verify the operation of proposed battery equalizer with characters as the following: low cost; high equalizer current and high efficiency.

DOI : http://dx.doi.org/10.11591/telkomnika.v12i3.4374