Operating Strategy of an Active Battery Switching System in Electric Vehicles

this paper presents the results of research into the application of an active battery switching system in an electric vehicle's drivetrain. The system's purpose is to increase the drivetrain's electrical efficiency, especially in the partial-load range. Efficiency is increased using a switching system that allows the vehicle's traction-battery circuitry to be changed during operation, thereby adjusting the intermediate circuit voltage to that actually required. The system consists of three electronic switches, which allow two different voltages in the intermediate circuit. This paper presents possible operating strategies of the new system developed from roller dynamometer test runs.