This study sought to investigate methods of charging nickel/metal hydride (Ni/MH) batteries for use in an electric vehicle(EV). The specific conditions for the multi-step constant-current charging method with regulation of voltage and dT/dt were varied in an attempt to improve high-energy efficiency, shorten charging time, and increase cycle life. A commercial battery system with 12 modules was subjected to a discharge/charge cycling test using patterns of dynamic stress test (DST) 120. Two-step charging with a first-step current of 0.5 CA (1 CA=95 A) was completed in less than 2.5 h after DST 120-pattern discharging to 80% DOD. Further, three-step charging with the first step of 1.0 CA reduced charging time to about 1.5 h. Multi-step constant-current charging provided a high-energy efficiency of more than 80%. The battery system withstood over 1800 cycles in a cycling test with reduction DST120-pattern discharge of 20%, but reductions in constant-current discharge of only 7%, due to a gradual decrease of discharge power, independently of the value of the charging current.


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    Title :

    Multi-step constant-current charging method for an electric vehicle nickel/metal hydride battery with high-energy efficiency and long cycle life


    Contributors:
    Ikeya, T. (author) / Sawada, N. (author) / Murakami, J. (author) / Kobayashi, K. (author) / Hattori, M. (author) / Murotani, N. (author) / Ujiie, S. (author) / Kajiyama, K. (author) / Nasu, H. (author) / Narisoko, H. (author)

    Published in:

    Publication date :

    2002


    Size :

    7 Seiten, 10 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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