A Novel Design for Flywheel Battery of Electric Vehicles

Flywheel battery is a new concept battery for storing energy in mechanical form, it offers some attractive advantages as compared to chemical battery for electric vehicles, such as high energy and power density, long cycle life and reduction of maintenance. This work designed an integrated flywheel battery with an axial-flux motor/generator which rotor is integrated with the flywheel. Mathematical model of integrated motor/generator had been established and a disk-type integrated flywheel battery prototype was setup. The experiment validated feasibility of integral design scheme of flywheel battery and showed a good match with theoretical analysis.