Energy Management in Future Li-ion Batteries: Impedance Spectroscopy as a Diagnosis Tool for SoC and SoH Evaluation
TP-AAB-AABC_2009_P_21
06/10/2009
- Content
- The goals of the ALIDISSI project are to improve the performances of Li-ion batteries (capacity, life cycle) and to develop the EIS as an in-situ method for battery diagnosis, in particular for traction batteries to be used in future hybrid electric vehicles. This study includes a theoretical part devoted to the application of 3-electrode EIS to Li-ion cells as a function of SoC and SoH during accelerated ageing cycles. The purpose of this work is to determine the electrochemical phenomena occurring at both electrodes and their respective footprints in EIS diagrams, in particular the ageing mechanisms in Li-ion systems which need to be clarified. On the basis of impedance parameters representative of state-of-charge (SoC) and state-of-health (SoH), a new tool for non intrusive and in-situ diagnosis of batteries will be developed and validated with a 2- electrode set-up on commercial Li-ion systems, enlarging the application scope of the work. In this paper, preliminary results obtained on 3-electrode prototype pouch cells made with a promising electrode couple (LiFePO4/Li4Ti5O12) will be presented. On-going work on LiFePO4/LiC6 commercial cells opens new perspectives for the real-time energy management in future Li-ion batteries.
- Citation
- Bernard, J., Sauvant-Moynot, V., Rebours, B., Mingant, R. et al., "Energy Management in Future Li-ion Batteries: Impedance Spectroscopy as a Diagnosis Tool for SoC and SoH Evaluation," SAE Technical Paper TP-AAB-AABC_2009_P_21, 2009, .