Energy storage system using battery and ultracapacitor on mobile charging station for electric vehicle

The deployment of electric vehicle (EV) as the new era of green transportation needs a continuous support on charging infrastructure. Charging mechanism could be provided in residential area or in the public area. In public area, charging infrastructure could be in the form of fixed charging station (FCS) or delivered as a mobile charging station (MCS). MCS unit should be in the form of truck-type vehicle equipped with several charging outlet to conduct charging for EVs inside or outside FCS area. When conducting off-grid charging outside FCS area, MCS power source would come from energy storage equipped inside the MCS. There are several energy storages widely used in EV application such as battery and ultracapacitor. This paper determined that Lithium-iron phosphate (LiFePO4) is the most suitable battery and electric double-layer capacitor (EDLC) is the most appropriate ultracapacitor for MCS application. The combination of battery and ultracapacitor provide current and voltage respond which is fit to conduct fast or ultrafast charging. This paper also provides an energy storage system to facilitate battery and ultracapacitor to be installed in MCS truck utilizing back compartment, side panels, and dash board. (C) 2015 The Authors. Published by Elsevier Ltd.