When a lead-acid battery is operated in a hybrid electric vehicle and is not regularly brought to a full state-of-charge, known as operation in a high-rate partial state-of-charge (HRPSoC) regime, a novel failure mode appears. Whereas traditional automotive batteries generally ultimately fail due to processes occurring at the positive plate, a standard lead-acid battery in HRPSoC fails as a result of the accumulation of sulfate on the negative plate. The ALABC has been carrying out focused program of R&D to investigate ways of achieving this high rate performance in valve-regulated designs without these negative plate problems. The stratgey adopted is based on the notion that it is necessary to employ a design of grid which allows as much of the active material to participate in discharge and charge reactions as possible, even at the highest rates, and to facilitate the charge reaction at the expense of secondary reactions (hydrogen evolution etc.). A spiral-wound cell with grid with dual tabs led to investigations onto other grid designs and their optimization. Carbon particles helped to resist the accumulation of sulfate on the negative plate. Demonstration projects in hybrid electric cars showed the applicability and improvements of these steps.


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    Title :

    Future generation vehicles and the potential impact on lead-acid batteries


    Additional title:

    Künftige Fahrzeuge und die potentiellen Auswirkungen auf Bleiakkumulatoren


    Contributors:


    Publication date :

    2005


    Size :

    16 Seiten, 27 Bilder, 8 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English





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