Novel state-of-health diagnostic method for Li-ion battery in service

R. Mingant, J. Bernard and V. Sauvant-Moynot

Applied Energy, 2016, vol. 183, issue C, 390-398

Abstract: The development of improved State-of-Health (SoH) diagnostic methods is a current research topic for battery-powered applications. For instance, the current rapid development of Electric Vehicles (EV) creates a strong demand for an accurate and reliable on-board SoH indicator during operation. Such an indicator is a key parameter required to optimize battery energy management and to track the degradation of the system performance. The electrochemical impedance spectrum (EIS) of an electrochemical system is a powerful lab-based diagnostic technique, usually measured using a frequency response analyzer. In this paper, we present an innovative diagnostic technique based on analysis of free voltage and current signals to give a so called “quasi-electrochemical impedance spectrum” (QEIS) and demonstrate its application on a Li-ion battery during a real EV duty cycle. It is worth noting that in our technique no additional signal is applied to the cell, since the current flowing into cells during use on-board is directly processed in the data treatment step.

Keywords: Li-ion battery; Lithium Iron Phosphate-graphite (LFP-C); Ageing; State of Health (SOH); Fast Fourier Transform (FFT); Electrochemical Impedance Spectroscopy (EIS) (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (15)

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DOI: 10.1016/j.apenergy.2016.08.118

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