A novel energy management system for full electric vehicles

Abstract

A Battery Electric Vehicle (BEV) is a type of Electric Vehicle (EV) in which all power is derived from electrical sources. They are the cleanest transportation alternatives, and expected to spread. Main disadvantages of BEVs are short driving range, low performance in demanding conditions, and low battery lifetimes. In this paper a novel battery-battery hybrid system is proposed. The system has a cell-scale energy management strategy in order to maintain modularity and compatibility. Also the system has ability of active battery voltage balancing without any extra effort. System has a semi-active hybridization strategy with a simple control scheme. Furthermore system provides an efficient energy management, independent from route conditions. Both system and the control strategy are introduced in details. Simulations are performed with different scenarios in order to demonstrate both voltage balancing and energy management capabilities of the system. It is supported with simulations that the system extends the battery life almost two times and experimental results are also included. Efficiency of the system during energy transfer is over 95%.