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Cycle life of traction battery has a direct effect on the use of electric vehicles. In this work, both normal cycle life and bus cycle life testing were investigated. Battery life can be tested with the bus-cycle procedure similar to the real use on road. Both the fading of capacity and the increase of the internal resistance should be tested and evaluated during life testing and the overall merit of battery attenuation should be given. All the discharge energy during life testing should be calculated, which can give the information of the real usable energy during all its life time.

Electrification is regarded as the mainstream for future automobile power-train in order to cope with the impending energy and environmental problems. The technology of electric vehicle (EV), including battery powered vehicle, hybrid vehicle and fuel cell vehicle, has been investigated thoroughly for more than two decades in China. Many remarkable progresses have been achieved. In this paper, the R & D of electric vehicle technology in China are introduced. Both battery and motor development for electric vehicle application are summarized. The technology trend of electric motor drive is discussed accompanying with the introduction of the practice in electric motor drive research in Chinese Academy of Sciences.