Work

Optimized perturbation technique for enhanced broadband impedance measurement in Lithium-ion batteries

Year: 2025

Type: article

Abstract: Battery impedance provides critical insights into the internal state and health of a battery, makingaccurate frequency-domain measurement essential for characterization and diagnostics. This paperaddresses key challenges in battery impedance measurements and evaluates two existing perturbationapproaches for broadband impedance measurements in lithium-ion batteries using the same perturbationsignal for comparative analysis. A novel approach is proposed that divides the frequency range intomultiple bands, each independently perturbed using optimized excitation signals tailored to the band.Statistical averaging is implemented to further enhance measurement precision. By concentratingperturbation energy within specific frequency regions, the method improves the signal-to-noise ratioand reduces variance and bias in the impedance response. Experimental results demonstrate that thistechnique extends the measurable frequency range and improves accuracy compared to conventionalmethods, offering significant advancements in battery diagnostics.

Source: e-Prime - Advances in Electrical Engineering Electronics and Energy

DOI: 10.1016/j.prime.2025.100948

Authors: Zandile C. Moyo, Fredrick M. Mwaniki

Institution: Stellenbosch University

Language: English

Topic: Advanced Battery Technologies Research

Subfield: Automotive Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,400

Funder: National Research Foundation