Abstract
Hybrid electric vehicles (HEVs) are the future transportation structure as they provide better fuel economy. Energy storage devices are therefore required for the HEVs. The problem for deciding the optimum combination of power storage is still unresolved. The power storage options in this regard must have a feasible weight/energy ratio for better performance. This survey is about the comparison of different power storage options for HEV including the batteries, super-capacitors, and flywheel. The equivalent circuit for the potential storage devices given will help in establishing the optimum choice of energy storage. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4759457]