Electric Vehicle Battery Charging Strategy for Maximizing Energy Efficiency of Combined Battery-Charger System

Lawrence Wang

Keywords

energy efficiency, energy and environment, electric vehicle, battery charging

Abstract

Research on electric vehicle and plug-in electric vehicle battery charging is often focused on charging speed; less discussed is the charging efficiency which impacts energy consumption and cost. This paper proposes a minimum loss charging strategy, considering the charging time constraint, for the combined battery and charger system. Compared with many other complex strategies, the proposed method selects the optimal charging current and voltage for the common constant current, constant voltage charging scheme, and is therefore very easy to implement. The approach also includes the impact of charger which was often neglected in the previous works. The algorithm is tested in simulation and the approach is verified in experiment. The results show it can benefit both the fast station charging and slow overnight charging.

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