Fuzzy Logic Combined with Impedance Measurements to Assess the SOC and SOH of Lithium-ion Cells

Ali Zenati (1) , Philippe Desprez (1, 2) , Hubert Razik (3) , Stéphane Rael (2)

1 SAFT [Bordeaux]
2 GREEN - Groupe de Recherche en Electrotechnique et Electronique de Nancy
3 AMPERE - Ampère

This paper describes experimental results aiming at analyzing lithium-ion batteries performances with aging, for different state of charge and temperatures. The results are provided from electrochemical impedance spectroscopy (EIS) measurements on new and aged cells. A climatic test chamber is used during experiments to simulate the conditions of the temperature. Experimental data are plotted over a broad spectrum of frequencies on Nyquist diagrams. We will also inspect the impact of the presence of a DC current during the EIS measurement. Finally, obtained results will be processed in a way to be used in a fuzzy logic system (FLS), to assess either the state of charge (SOC) or the state of health (SOH) of cells.

Mots clés: Lithium-ion batteries; Aging; EIS; State Of Charge; State Of Health; Fuzzy Logic System

Domaines: Energie électrique

Ali Zenati, Philippe Desprez, Hubert Razik, Stéphane Rael. Fuzzy Logic Combined with Impedance Measurements to Assess the SOC and SOH of Lithium-ion Cells. CMD 2010, Sep 2010, Tokyo, Japan. pp.1008-1011. ⟨hal-00518009⟩