Online High-Resolution EIS of Lithium-Ion Batteries by Means of Compact and Low Power ASIC

A compact electronic circuit capable of performing Electrochemical Impedance Spectroscopy (EIS) on either single Lithium-ion cells or modules formed by the series of two cells is presented. The proposed device, named Double Cell Management Unit (DCMU), constitutes an important improvement to a recen...

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Bibliographic Details
Published in:Batteries (Basel) 2023-04, Vol.9 (5), p.239
Main Authors: Ria, Andrea, Manfredini, Giuseppe, Gagliardi, Francesco, Vitelli, Michele, Bruschi, Paolo, Piotto, Massimo
Format: Article
Language:English
Subjects:
Amplitudes
Application-specific integrated circuits
Batteries
cell management unit
Circuits
Communication
Custom integrated circuits
Design and construction
Electric cells
Electric vehicles
Electrochemical impedance spectroscopy
Electrolytes
Electronic circuits
Frequency ranges
Impedance spectroscopy
Integrated circuits
Lithium
Lithium cells
Lithium-ion batteries
Medical equipment
Moisture effects
multi-measurand acquisition system
Power
Rechargeable batteries
Sensors
Spectrum analysis
Stimulation
Strain gauges
system on a chip
Thermistors
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Summary:A compact electronic circuit capable of performing Electrochemical Impedance Spectroscopy (EIS) on either single Lithium-ion cells or modules formed by the series of two cells is presented. The proposed device, named Double Cell Management Unit (DCMU), constitutes an important improvement to a recently proposed cell management unit, which combined EIS acquisition functions with a multichannel sensor interface compatible with thermistors, strain-gauges and moisture detectors. The proposed circuit maintains the versatility of the previous version and significantly extends the EIS frequency range, allowing vector impedance measurements from 0.1 Hz to about 15 kHz. The capability of handling both single Lithium-ion cells or series of two cells is obtained by adding a few external components to the previous version. This also allowed increasing the stimulation current to a maximum amplitude of 200 mA, resulting in improved resolution. Experiments consisting in EIS acquisition performed on batteries of different capacity at different temperatures and states of charge are described. Estimated impedance resolution (standard deviation) is 20 μΩ obtained at 1 kHz with a stimulation current of 100 mA amplitude.
ISSN:2313-0105
2313-0105
DOI:10.3390/batteries9050239