Alternating current impedance spectroscopy (ACIS) was performed on commercial sealed lead acid batteries. A method previously developed in the literature was modified to determine the state of charge of sealed lead acid cells by obtaining the impedance spectrum in a wide frequency range. The data were sensitive to state of charge at low frequencies. A modified Randles' circuit was used to fit the impedance data. The effect of the state of charge on the equivalent circuit parameters was determined.
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- R Ω :
ohmic resistance of battery (Ω)
- C dl :
double layer capacitance (F)
- Q 1 :
constant phase element representing double layer capacitance
- Q 2 :
constant phase element representing Warburg diffusion
- O :
finite diffusion element
- R t :
charge transfer resistance (Ω)
- R s,R p :
equivalent series and parallel resistance (Ω)
- C s,C p :
equivalent series and parallel capacitance (F)
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Viswanathan, V.V., Salkind, A.J., Kelley, J.J. et al. Effect of state of charge on impedance spectrum of sealed cells Part II: Lead acid batteries. J Appl Electrochem 25, 729–739 (1995). https://doi.org/10.1007/BF00648628
- Impedance Spectroscopy
- Equivalent Circuit
- Impedance Spectrum
- Impedance Data