Ternary pseudo-random test signals with a DFT-eigenvector property let battery impedance be measured during charging, with drift and transient artifacts removed by combining oppositely signed spectral components.
Applica- tion of electrochemical impedance spectroscopy to commercial Li-ion cells: A review,
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Pseudo-random sequences for low-cost operando impedance measurements of Li-ion batteries
Ternary pseudo-random test signals with a DFT-eigenvector property let battery impedance be measured during charging, with drift and transient artifacts removed by combining oppositely signed spectral components.