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A method for the fast estimation of a battery entropy-variation high-resolution curve – Application on a commercial LiFePO4/graphite cell

Abstract : The entropy-variation of a battery is responsible for heat generation or consumption during operation and its prior measurement is mandatory for developing a thermal model. It is generally done through the potentiometric method which is considered as a reference. However, it requires several days or weeks to get a look-up table with a 5 or 10 % SoC (State of Charge) resolution. In this study, a calorimetric method based on the inversion of a thermal model is proposed for the fast estimation of a nearly continuous curve of entropy-variation. This is achieved by separating the heats produced while charging and discharging the battery. The entropy-variation is then deduced from the extracted entropic heat. The proposed method is validated by comparing the results obtained with several current rates to measurements made with the potentiometric method.
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https://hal.archives-ouvertes.fr/hal-02007386
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Submitted on : Tuesday, February 5, 2019 - 11:26:22 AM
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  • HAL Id : hal-02007386, version 1

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Nicolas Damay, Christophe Forgez, Marie-Pierre Bichat, Guy Friedrich. A method for the fast estimation of a battery entropy-variation high-resolution curve – Application on a commercial LiFePO4/graphite cell. Journal of Power Sources, Elsevier, 2016, 332, pp.149-153. ⟨hal-02007386⟩

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