Offline State-of-Health Estimation for High-Power Lithium-Ion Batteries Using Three-Point Impedance Extraction Method

Hsiang Fu Yuan, Lan-Rong Dung

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

This paper presents an offline state-of-health (SoH) estimation based on charge transfer resistance for high-power lithium-ion (Li-ion) batteries, such as lithium iron phosphate (LFP) batteries. As shown in the experimental results, the charge transfer resistance has a great aging change with battery degradation and good abilities against state-of-charge (SoC) drift and external resistance variation in the impedance parameter set of a single-time-constant equivalent circuit model (ECM), including ohmic resistance, charge transfer resistance, double-layer capacitance, and time constant, for SoH estimation. A fast and efficient three-point (TP) impedance extraction method is also proposed in this paper for accurately extracting the charge transfer resistance in offline SoH estimation. The results of long-term cycling test demonstrate that the TP impedance extraction method can successfully indicate the SoH of LFP batteries with low estimation error of 6.1%.

Original languageEnglish
Article number7478163
Pages (from-to)2019-2032
Number of pages14
JournalIEEE Transactions on Vehicular Technology
Volume66
Issue number3
DOIs
StatePublished - 1 Mar 2017

Keywords

  • Battery second use
  • impedance estimation
  • lithium battery
  • offline battery measurement
  • state-of-health (SoH)

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