Modèle multiphysique et méthodes d'analyse in-situ, non destructives, qualitatives et quantitatives de diverses sources de vieillissement d'accumulateurs lithium-ion

Abstract : Optimisation of a battery life time requires the prediction of its ageing and the identification of the involved ageing mechanisms. In order to avoid the limitations due to standard ageing characterisation methods (performance evaluations conducted regularly along ageing and post-mortem characterisations), other tools allowing assessment of the electrode state without deterioration along the life time, have been tested. It concerns a multiphysic model of lithium-ion battery and two methods for in-situ parameter extraction: the first is based on the study of the derivative of the tension profile and the second one, on the difference between the slope of the tension profiles at the fresh state and at the considered state. The non-available parameters required for set up of the multiphysic model for one battery have been evaluated for different states of charge and various temperatures. This model has been validated by comparison with experimental measurements. The application of these tools is illustrated for three different ageing mechanisms. Moreover these methods have been especially applied for the case of lithium plating ageing. Use of the VL41M Saft model allowed to set up an abacus of the limiting charge currents and an experimental validation has been performed in using the method so-called derivation method
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Nathalie Legrand. Modèle multiphysique et méthodes d'analyse in-situ, non destructives, qualitatives et quantitatives de diverses sources de vieillissement d'accumulateurs lithium-ion. Autre. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0240⟩. ⟨tel-01750534⟩

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