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Method of estimating pulse response using an impedance spectrum

United States Patent

October 21, 2014
View the Complete Patent at the US Patent & Trademark Office
Method and Apparatus for In-Situ Real Time Characterization of Energy Storage and Energy Conversion Devices
Electrochemical Impedance Spectrum data are used to predict pulse performance of an energy storage device. The impedance spectrum may be obtained in-situ. A simulation waveform includes a pulse wave with a period greater than or equal to the lowest frequency used in the impedance measurement. Fourier series coefficients of the pulse train can be obtained. The number of harmonic constituents in the Fourier series are selected so as to appropriately resolve the response, but the maximum frequency should be less than or equal to the highest frequency used in the impedance measurement. Using a current pulse as an example, the Fourier coefficients of the pulse are multiplied by the impedance spectrum at corresponding frequencies to obtain Fourier coefficients of the voltage response to the desired pulse. The Fourier coefficients of the response are then summed and reassembled to obtain the overall time domain estimate of the voltage using the Fourier series analysis.
Morrison; John L. (Butte, MT), Morrison; William H. (Manchester, CT), Christophersen; Jon P. (Idaho Falls, ID), Motloch; Chester G. (Idaho Falls, ID)
Battelle Energy Alliance, LLC (Idaho Falls, ID), Qualtech Systems, Inc. (East Hartford, CT), Montana Tech of the University of Montana (Butte, MT)
12/ 813,750
June 11, 2010
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under Contract No. DE-AC07-05ID14517 awarded by the United States Department of Energy. The government has certain rights in the invention.