Precise Online Electrochemical Impedance Spectroscopy Strategies for Li-Ion Batteries

This article presents an online electrochemical impe-dance spectroscopy (EIS) technique for a Li-Ion battery. A frequency sweeping method and a precise impedance measurement algorithm are used for the proposed online EIS technique. The proposed algorithm consists of fast Fourier transformations, pea...

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Bibliographic Details
Published in:IEEE transactions on industry applications Vol. 56; no. 2; pp. 1661 - 1669
Main Authors: Islam, S. M. Rakiul, Park, Sung-Yeul
Format: Journal Article
Language:English
Published: New York IEEE 01.03.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Amplification
Batteries
Battery
Battery charge measurement
Battery chargers
Buck converters
Circuits
Current measurement
Dance
Electric potential
Electrochemical impedance spectroscopy
electrochemical impedance spectroscopy (EIS)
Fast Fourier transformations
Impedance
Impedance measurement
Instruments
internal impedance
Lithium-ion batteries
online measurement
Perturbation methods
precision
Rechargeable batteries
Ripples
Signal measurement
Spectrum analysis
Voltage
Voltage measurement
ISSN:0093-9994, 1939-9367
Online Access:Get full text
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Description
Summary:This article presents an online electrochemical impe-dance spectroscopy (EIS) technique for a Li-Ion battery. A frequency sweeping method and a precise impedance measurement algorithm are used for the proposed online EIS technique. The proposed algorithm consists of fast Fourier transformations, peak amplitudes, and phase difference estimations. Additional instrumentation with offset clipping and amplifying circuits expand the accuracy of the signal measurement. The offset clipping circuit increases the ripple to measurement voltage ratio without phase delay. The amplifying circuit gives more resolution for the ripple voltage. The proposed instrumentation ensures the precise measurement of ripple voltage and current. The proposed impedance measurement algorithm fulfills the precision level required for industrial Li-Ion battery. To validate the proposed approach, a 40-Ah 13.6 V Li-Ion battery charger was built using a synchronous buck converter and an Opal-RT based controller. The proposed spectroscopy technique will be useful to track and estimate internal electrochemical conditions of a battery.
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ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2019.2958555