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A Novel Equivalent Circuit Model for Lithium-ion Battery with Complex Electrical Element Parameters
Technical Paper
2016-01-1197
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An equivalent circuit model for lithium-ion battery including capacitor and inductor with complex parameters is proposed. The imaginary part of the complex-valued capacitor expresses diffusion processes instead of constant phase element, which leads to a higher computational efficiency by removing the exponential variant calculation. The inductor with the complex parameter, the imaginary part accounting for the frequency-dependent magnetic hysteresis loss of battery current collectors and cables, can accurately regenerate the impedance characteristics at high frequencies with various linear slope angles to the real axis in a Nyquist plot. The fitted electrochemical impedance spectrum of a lithium iron phosphate/graphite battery with this proposed model is compared to the measured data. The maximum relative error of the impedance magnitude is 4.94% at the frequencies between 0.01 Hz and 10 kHz. The electrical component parameters of the proposed equivalent circuit model are calculated and analyzed.
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Authors
Citation
Wu, Z., Weng, R., Zhang, Z., and Li, J., "A Novel Equivalent Circuit Model for Lithium-ion Battery with Complex Electrical Element Parameters," SAE Technical Paper 2016-01-1197, 2016, https://doi.org/10.4271/2016-01-1197.Also In
References
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