Laurent Gagneur

Modeling of the diffusion phenomenon in a lithium-ion cell using frequency or time domain identification

Abstract The paper deals with the identification of a graphite/LiFePO 4 Li-Ion cell, the model of which is based on an electric equivalent circuit. The paper focuses on the choice of the model used to represent the diffusion phenomena and on the parameters identification method. For this goal, two main models have been compared: a constant phase element model (CPE) and an hyperbolic tangent model (Tanh). These two models have been identified either using a frequency and a time domain method. The validity and accuracy of the model have been evaluated over a NEDC driving cycle.

Lithium-ion state of charge observer with open circuit voltage hysteresis model

This paper deals with a state of charge (SOC) observer for a lithium ion battery, based on a Kalman filter and on the main electrochemical phenomena modeling. In this paper, a method to consider the hysteresis phenomenon on the Open Circuit Voltage has been developed and included into a SOC observer.

On-line adaptive tuning of a lithium-ion battery cell state of charge observer

This paper deals with the adaptive tuning of a state of charge observer for a lithium ion battery cell, based on an extended Kalman filter and on the main electrochemical phenomena modeling. A high level parameter to tune the observer is introduced and used to reduce the influence of modeling errors on the state of charge estimate.