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

作者：Damay Nicolas; Forgez Christophe^*; Bichat Marie Pierre; Friedrich Guy

来源：Journal of Power Sources, 2016, 332: 149-153.

DOI：10.1016/j.jpowsour.2016.09.083

• Batteries
• Thermal model inversion
• Heat generation
• Entropy variation

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.

• 出版日期2016-11-15