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The onboard energy-storage system (ESS) of hybrid electric vehicles (HEVs) has a significant impact on their fuel efficiency and all-electric range (AER). Energy-storage Devices charge when there is little demand for electricity and discharge when high power requirements that operate as catalysts to boost energy. In ground vehicles, batteries serve as the main energy storage mechanism. Vehicles with an AER of 15% or more almost twice the added expense of the ESS. As the result ESS requires more peak power while maintaining high energy density of HEVs. In comparison to batteries, ultracapacitors (UCs) are the solutions with better power densities. For more advanced hybrid vehicular ESSs, a hybrid ESS made of batteries, UCs, and/or fuel cells (FCs) would be a better choice. Modern energy-storage architectures for HEVs and plug-in HEVs are presented in this work (PHEVs).
Keywords
Onboard Energy Storage; Hybrid Electric Vehicles (HEVs); Catalyst; Energy Density; Battery; Plug-in HEVs (PHEVs); Ultracapacitor (UC)