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A review of state-of-charge indication of batteries by means of a.c.impedance measurements
Journal of Power Sources 872000.12–20
A non-destructive estimation of the state-of-chargeSoC.of batteries facilitates optimum utilization of the battery for a given
application, as well as evaluation of its state-of-health. Among various methods, a.c. impedance spectroscopy over a wide range of
frequencies provides a variety of parameters which are functions of the SoC of a given battery. These parameters and their variation with
SoC depend on the type of battery and on the experimental conditions. The impedance data of sealed commercial cells are rather tedious
to analyze since the results are generally the combined parameters of both the positive and the negative electrodes. Separation of the
parameters which correspond to the individual electrodes involves assumptions, the validity of which is open to question. Nevertheless,
systematic linear and reproducible variations of measurable or computable impedance parameters with battery condition are useful
indicators of the SoC in a non-destructive way. The present review consolidates the literature on the prediction of the SoC of batteries by
means of a.c. impedance measurements. q2000 Elsevier Science S.A. All rights reserved.

[ Last edited by magicpopo on 2008-5-1 at 15:41 ]

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