Approach to wide-frequency battery impedance measurements in commercial applications

Arne Sandschulte, Roberto Ferrero, Laurence Hardwick, Edoardo Patelli

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Abstract

Electrochemical Impedance Spectroscopy (EIS) is a well-established diagnostic technique for the characterization and monitoring of electrochemical devices, such as batteries. As different electrochemical processes have very different dynamics, a complete characterization of batteries requires measuring their impedance over a very wide frequency range, from less than 1 mHz to more than 1 kHz. However, significant measurement challenges affect the extreme frequencies and may limit the practically achievable frequency range, particularly in case of in situ EIS. This paper analyzes the main measurement challenges that appear at low and high frequencies, respectively, and proposes possible strategies, suitable to be used in commercial applications. A compensation for the effect of the state-of-charge variation is proposed to improve the accuracy of EIS at low frequencies, while a strategy to measure high-frequency perturbations with a lower sampling frequency is presented to achieve high-frequency EIS with affordable instrumentation. Experimental results obtained on a lithium iron phosphate cell are reported, used to validate the proposed methods.

Original languageEnglish
Title of host publication2019 IEEE 10th International Workshop on Applied Measurements for Power Systems - Proceedings
Place of PublicationPiscataway, NJ
PublisherIEEE
Number of pages6
ISBN (Print)9781728100753
DOIs
Publication statusE-pub ahead of print - 14 Nov 2019
Event10th IEEE International Workshop on Applied Measurements for Power Systems, AMPS 2019 - Aachen, Germany
Duration: 25 Sep 201927 Sep 2019

Conference

Conference10th IEEE International Workshop on Applied Measurements for Power Systems, AMPS 2019
CountryGermany
CityAachen
Period25/09/1927/09/19

Keywords

  • batteries
  • condition monitoring
  • electrochemical devices
  • electrochemical impedance spectroscopy
  • measurement
  • state estimation

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  • Cite this

    Sandschulte, A., Ferrero, R., Hardwick, L., & Patelli, E. (2019). Approach to wide-frequency battery impedance measurements in commercial applications. In 2019 IEEE 10th International Workshop on Applied Measurements for Power Systems - Proceedings [8897753] IEEE. https://doi.org/10.1109/AMPS.2019.8897753