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A study of the influence of measurement timescale on internal resistance characterisation methodologies for lithium-ion cells
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Barai, Anup, Uddin, Kotub, Widanage, Widanalage Dhammika, McGordon, Andrew and Jennings, P. A. (Paul A.) (2018) A study of the influence of measurement timescale on internal resistance characterisation methodologies for lithium-ion cells. Scientific Reports, 8 . 21. doi:10.1038/s41598-017-18424-5 ISSN 2045-2322.
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Official URL: https://doi.org/10.1038/s41598-017-18424-5
Abstract
The power capability of a lithium ion battery is governed by its resistance, which changes with battery state such as temperature, state of charge, and state of health. Characterizing resistance, therefore, is integral in defining battery operational boundaries, estimating its performance and tracking its state of health. There are many techniques that have been employed for estimating the resistance of a battery, these include: using DC pulse current signals such as pulse power tests or Hybrid Pulse Power Characterization (HPPC) tests; using AC current signals, i.e., electrochemical impedance spectroscopy (EIS) and using pulse-multisine measurements. From existing literature, these techniques are perceived to yield differing values of resistance. In this work, we apply these techniques to 20 Ah LiFePO4/C6 pouch cells and use the results to compare the techniques. The results indicate that the computed resistance is strongly dependent on the timescales of the technique employed and that when timescales match, the resistances derived via different techniques align. Furthermore, given that EIS is a perturbative characterisation technique, employing a spectrum of perturbation frequencies, we show that the resistance estimated from any technique can be identified – to a high level of confidence – from EIS by matching their timescales.
Item Type: | Journal Article | |||||||||||||||||||||
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Subjects: | Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | |||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Lithium ion batteries -- Testing, Impedance spectroscopy, Electrochemical analysis | |||||||||||||||||||||
Journal or Publication Title: | Scientific Reports | |||||||||||||||||||||
Publisher: | Nature Publishing Group | |||||||||||||||||||||
ISSN: | 2045-2322 | |||||||||||||||||||||
Official Date: | 8 January 2018 | |||||||||||||||||||||
Dates: |
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Volume: | 8 | |||||||||||||||||||||
Article Number: | 21 | |||||||||||||||||||||
DOI: | 10.1038/s41598-017-18424-5 | |||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||
Date of first compliant deposit: | 12 December 2017 | |||||||||||||||||||||
Date of first compliant Open Access: | 2 May 2018 | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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