Current 14V power net in the car with 12V lead-acid batteries has reached its power limitation. The future power net in the car will move to 42V to avoid further increases in current. In conflict with this trend the demand of reduced exhaust gases and lower fuel consumption is rising. New concepts of power management are at the point of commercialization: Start-stop functions can be implemented in a 42 V mild-hybrid system, and boost functions and recuperative braking in full-hybrids systems with higher voltages (e.g. 144 or 274V). Thus environmental protection can be reached together with additional functionality. Lead-acid batteries with higher voltages (36V) have been developed. But in applications, with e.g. frequent larger depth of discharge cycling, lead-acid batteries show significant drawbacks. A new electrochemical system, which has convincingly shown its performance in mobile phones, can substitute the old lead-acid system: Lithium ion batteries, with approximately only 1/2 of the volume and 1/3 of the weight of the conventional battery type. So far Lithium ion cells were available with relatively small capacities and low power performance (roughly <2 Ah and <1 C-rate). New designs and materials make possible to build up cells with 5 Ah and more. Continuous discharge power with more than 1000 W/kg and even higher pulse discharge power have been shown. Especially for automotive applications low and high temperature performance, calendar life and cycling performance are issues. The optimization of high power cells and the development of complete batteries with 36 V/27 Ah for the new power net and 288 V/6 Ah for hybrid electric vehicles (HEV) is described in the paper. Results on the cell level and on the battery level are presented.


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    Title :

    Advanced batteries for the 42V power net and hybrid electric vehicles


    Additional title:

    Fortschrittliche Batterien für das 42V-Bordnetz und hybride Elektrofahrzeuge


    Contributors:


    Publication date :

    2004


    Size :

    6 Seiten, 7 Bilder, 5 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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