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Modélisation de l'influence de la rapidité de recharge totale ou partielle sur les performances électro-thermiques et la durée de vie des batteries pour applications automobiles

Abstract : Fast charging of batteries is a major challenge for the development of electric vehicles. A deployment of high power chargers is underway. These high power levels motivate research on batteries, with the aim of significantly reducing their charging times.For a battery cell of given characteristics, the charging power is limited by electrical, thermal and lifetime considerations. This thesis then wishes to make a contribution to the reduction of the charging time, by taking a numerical approach including modeling, simulation and optimization. It also compares 4 cell references of different materials and different energy densities.First, models of the electrical, thermal and aging behavior of a cell are developed separately, then coupled. In a systematic way, the models are presented, their calibration procedures are described, and they are compared with experimental data. Particular attention is paid to the effect of high current regimes under different thermal conditions. This made it possible to extend their respective domains of validity.Then, an accelerated aging campaign is carried out on 3 cell references. It compares the effect of the charging current, the end-of-charge voltage and different thermal conditions on the degradation, within the framework of a reference charging protocol. The results made it possible to identify several strategies for reducing the charging time, regarding the choice of a cell reference, thermal management, and the optimization of the charging protocol.This last strategy is finally studied. A method of definition of a charge protocol, containing several stages of constant current, is developed based on numerical optimization. The method makes uses the electro-thermal model implemented. It is then used to define 5 optimized charging protocols which are subjected to accelerated aging tests. The degradation is compared to that observed for the reference charging protocol. Under comparable conditions with the reference protocol, the optimized protocols make it possible to reduce the charging time and/or the degradation.
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Submitted on : Monday, August 24, 2020 - 3:34:09 PM
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Romain Mathieu. Modélisation de l'influence de la rapidité de recharge totale ou partielle sur les performances électro-thermiques et la durée de vie des batteries pour applications automobiles. Electronique. Université de Bordeaux, 2020. Français. ⟨NNT : 2020BORD0026⟩. ⟨tel-02920329⟩

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