Hence, in this work, a simulation tool which enables engineers to design energy storage stacks with respect to critical temperatures was developed. The model itself consists of several components, such as an impedance-based loss model to calculate irreversible losses, a model to represent reversible temperature effects of the devices and a three-dimensional heat transfer model with lumped thermal parameters which is able to model anisotropic heat effects. The proposed model considers all relevant heat transfer mechanisms such as conduction, convection and radiation. Due to the structure of the heat transfer model it is very flexible and thus, allows to analyze the thermal behavior of single cells as well as cell stacks. The heat generation model is based an measured impedance spectra of the particular devices which allow a very detailed modeling of all relevant irreversible heat generation mechanisms inside batteries and double-layer capacitors. In conjunction with an accurate modeling of reversible heat generation processes which even occur in double-layer capacitors, this forms the basis for a very precise loss calculation model. By dividing the losses due to a spatial heat generation model, a good simulation performance for the entire model can be expected as shown in this work.


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    Title :

    Impedance based loss calculation and thermal modeling of electrochemical energy storage devices for design considerations of automotive power systems


    Contributors:

    Published in:

    Publication date :

    2006


    Size :

    150 Seiten, Bilder, Tabellen, 162 Quellen



    Type of media :

    Theses


    Type of material :

    Print


    Language :

    English