Li-Ion Cell Impedance Measurement Using Open/Short/Load Compensation for De-Embedding

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Abstract

Knowledge of battery cell impedance is crucial for the design of many modern applications, as well as for predicting their electromagnetic compliance. For detailed 3D simulation of battery packs, single cells are commonly replaced with simplified bodies enhanced by internal impedance data obtained from measurement on real cells. Thereby it is necessary to exclude all influence of the measurement setup, i.e. to de-embed the cell impedance from exterior properties. In this work, two approaches are presented to extract the impedance of an 18650 Lithium-ion (Li-ion) cell from within a battery holder on a printed circuit board (PCB), using Open/Short/Load compensation (OSLC) and a copper cylinder as reference. By adding components in series and parallel to the cell, it is verified that the extraction result is not impacted by PCB circuitry, and also that the cell’s impedance is load-independent. Eventually, the test setup including Li-ion cell is replicated as electromagnetic (EM) simulation project. Two measurement-based methods to model the cell are compared, suitable for both 3D or circuit simulation. The frequency range under consideration is from 9 kHz to 1 GHz, whereas the presented approach proves reliable up to 200 MHz.
Original languageEnglish
Title of host publication2021 Joint IEEE International Symposium on Electromagnetic Compatibility Signal and Power Integrity, and EMC Europe, EMC/SI/PI/EMC Europe 2021
PublisherIEEE Publications
Pages190-195
Number of pages6
ISBN (Electronic)9781665448888
ISBN (Print)978-1-6654-4889-5
DOIs
Publication statusPublished - 26 Jul 2021
Event2021 Joint IEEE International Symposium on Electromagnetic Compatibility Signal and Power Integrity, and EMC Europe: EMC/SI/PI/EMC Europe 2021 - Raleigh, United States
Duration: 26 Jul 202120 Aug 2021

Publication series

Name2021 Joint IEEE International Symposium on Electromagnetic Compatibility Signal and Power Integrity, and EMC Europe, EMC/SI/PI/EMC Europe 2021

Conference

Conference2021 Joint IEEE International Symposium on Electromagnetic Compatibility Signal and Power Integrity, and EMC Europe
Abbreviated titleEMC/SI/PI/EMC Europe 2021
Country/TerritoryUnited States
CityRaleigh
Period26/07/2120/08/21

Keywords

  • 18650 cylindrical cell
  • 3D simulation
  • battery
  • high frequency impedance
  • Lithium-ion
  • Open/Short/Load compensation (OSLC)
  • S-parameter

ASJC Scopus subject areas

  • Aerospace Engineering
  • Safety, Risk, Reliability and Quality
  • Signal Processing
  • Energy Engineering and Power Technology
  • Radiation
  • Electrical and Electronic Engineering

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