This paper presents a concise, analytic methodology to determine the optimal amount of hghtweighting for BEVs This is based on minimizing the marginal costs of vehicle hghtweighting with the cost reductions due to a smaller battery and motor required to maintain constant range and performance. The powertrain resizing effect is analytically determined. Current technology costs indicate that for the baseline BEV, optimal glider mass reduction of about 450 kg leads to manufacturing cost reductions of 4.9%. It is shown that declining battery and motor costs reduce the absolute importance of lightweighting in reducing BEV costs over time, and that rising electricity costs increase the gap between the optimal solutions, based on minimizing manufacturing vs. total costs. Whether the optimum level of weight reduction will decrease or increase depends on the relative development of battery vs. lightweighting costs. The sensitivity of the optimal lightweighting to critical cost parameters has been evaluated, and is shown to increase over time. In addition to cost and range, other criteria such as safety and environmental impacts are also important to consumers and the society. Vehicle manufacturers should consider these aspects in their decision about the best lightweighting strategy. The methodology presented in this paper allows the potential economic benefits of lightweighting to be determined early in the vehicle development process. It can be easily modified to be applied to other drivetrain types and vehicle market segments, and to include other optimization objectives.


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    Title :

    Optimal lightweighting in battery electric vehicles


    Contributors:

    Published in:

    Publication date :

    2012


    Size :

    12 Seiten, 8 Bilder, 7 Tabellen, 50 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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