Voltage Reduction Technique for Use With Electrochemical Impedance Spectroscopy in High-Voltage Fuel Cell and Battery Systems
An attractive application of electrochemical impedance spectroscopy (EIS) is for diagnostics of a fuel cell (FC) or a battery system during operation. The use of EIS, however, is mostly limited to low-voltage (LV) FC systems and laboratory environments. Hence, the application of EIS in advanced diagnostics of a high-power system certainly lacks due to the voltage limitation and/or cost of the equipment. In this paper, a precision, low-cost electronic interface is proposed which enables the use of existing LV ac diagnostic tools with a production-size FC or battery stacks without the need for postprocessing of data. The interface, a dc level reducer (DLR), reduces only the dc component of the stack voltage to a safe voltage of <60 without altering the ac diagnostic components. This paper explains in detail the development of the DLR circuitry. The scalability and real-world capability of the interface are demonstrated by developing it for two voltage ratings. A set of circuits rated for 30 V is tested with a nine-cell proton exchange membrane FC (PEMFC) stack, and circuits rated for 200 V are tested on 90- and 110-cell commercial PEMFC stacks. The stack voltage is reduced by 60% on the nine-cell stack, and 60%–90% on the 90- and 110-cell stacks. The accuracy is measured using EIS data for 74 frequency points in the range of 0.1–20 kHz, with and without the DLR. The maximum relative error for point-versus-point comparison of the impedance is measured at 0.8% and 1.4% for 30- and 200-V rated circuits, respectively. These errors are well within the error of the industrial measurement equipment used, proving the fidelity of the ac signal output from the DLR.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/23327782
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Supplemental Notes:
- Copyright © 2018, IEEE.
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Authors:
- Homayouni, Hooman
- DeVaal, Jake
- Golnaraghi, Farid
- Wang, Jiacheng
- Publication Date: 2018-6
Language
- English
Media Info
- Media Type: Web
- Features: References;
- Pagination: pp 418-431
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Serial:
- IEEE Transactions on Transportation Electrification
- Volume: 4
- Issue Number: 2
- Publisher: Institute of Electrical and Electronics Engineers (IEEE)
- ISSN: 2332-7782
- Serial URL: http://ieeexplore.ieee.org/servlet/opac?punumber=6687316
Subject/Index Terms
- TRT Terms: Diagnostic tests; Electrical impedance; Electrochemical processes; Fuel cell vehicles; Fuel cells; High voltage; Spectroscopy
- Uncontrolled Terms: Proton exchange membrane fuel cells
- Subject Areas: Energy; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 01679171
- Record Type: Publication
- Files: TRIS
- Created Date: Aug 27 2018 2:05PM