Requirements for Applying the Current Interruption Technique for Reconstructing the Impedance of Li-Ion Batteries
Year: 2025
Type: article
Abstract: Electrochemical impedance spectroscopy is a non-destructive technique that provides useful information on the status of a lithium-ion battery, including its state-of-health. However, conventional harmonic perturbation methods are too sophisticated for applications in operating environments. This study systematically investigates the system requirements for reconstructing impedance via the Fourier transform of voltage and current signals obtained upon current interruption. Using a calibrated equivalent circuit model, key parameters such as the minimum sampling interval ∆ t s , the initial time collected during relaxation t i , and the current removal duration t f , are correlated with the frequency range [ f min , f max ] in which impedance is reconstructed within 1% error. A Gaussian window, whose width is modulated with frequency, effectively mitigates noise up to 0.1 mV. The resulting general relations, f min = 4 / t f and f max = 0.07 / ∆ t s (or f max = 0.07 / t i for t i > ∆ t s ), are valid within 10−2–104 Hz, that is sufficient to cover ohmic, polarisation, and diffusion impedance features. Experimental tests on a commercial lithium-ion cell corroborate the generality of these system requirements. With a sampling interval of 70 μs for f max = 10 3 Hz and a waiting time of 40 s for f min
Language: English
Subfield: Automotive Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $1,950
OpenAlex ID: W4408828310