There is a widespread feeling that the electric vehicle must play an important role in the future, beginning with special applications in specific areas such as urban transportation and goods delivery, then spreading afterwards (in the medium- to long-term) to more complicated ones, like inter-urban use. From the point of view of the valve-regulated lead/acid battery, some problems remain to be solved before the technology can fulfil its task in any of the foreseen applications. This work concentrates on developing charging strategies to overcome the problem of limited vehicle range (typically 60 to 120 km). To increase the range, a straightforward solution from a practical point of view is to include in normal use as many rapid recharges as possible that are compatible with maintaining performance, especially cycle life. In order to test the influence of such rapid recharges on life, a study has been performed to determine the influence of final charging voltages, initial current and final equalization step. Results are encouraging and indicate a positive influence of rapid recharging on life, particularly for high initial currents (1C to 2C). Very high cycle lives of the order of 500-600 cycles at more than 80% DOD are obtained in bench tests. From these results, new tests have been started using recharge schedules of 1 h/10 h alternatively. The results confirm the previous studies: lives in the range of 600 cycles are obtained with no deleterious effects. Overcharge factors are low, resulting in extremely low water consumption. Other schedules, including a higher number of rapid charges for each normal charge, have also been considered.


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    Title :

    Charging strategies for valve-regulated lead/acid batteries in electric-vehicle applications


    Contributors:

    Published in:

    Journal of Power Sources ; 67 , 1-2 ; 125-133


    Publication date :

    1997


    Size :

    9 Seiten, 9 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






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