Batteries, ultra capacitors, fuel cells, and solar arrays are widely used in electric and hybrid vehicles (EVs/HEVs) as an electric power source or an energy storage unit. In the structure of the electric power system of modern EVs/HEVs, more than one of these units may be employed to improve the performance and efficiency; hence utilization of a multi-input dc-dc converter is inevitable to obtain a regulated bus dc voltage. In this paper, a review of multiple input dc-dc power electronic converters (MI-PEC) for EV/HEV is presented.