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Method and apparatus for in-situ characterization of energy storage and energy conversion devices

United States Patent

March 9, 2010
View the Complete Patent at the US Patent & Trademark Office
Idaho National Laboratory - Visit the Technology Transfer and Commercialization Office Website
Method and Apparatus for In-Situ Real Time Characterization of Energy Storage and Energy Conversion Devices
Disclosed are methods and apparatuses for determining an impedance of an energy-output device using a random noise stimulus applied to the energy-output device. A random noise signal is generated and converted to a random noise stimulus as a current source correlated to the random noise signal. A bias-reduced response of the energy-output device to the random noise stimulus is generated by comparing a voltage at the energy-output device terminal to an average voltage signal. The random noise stimulus and bias-reduced response may be periodically sampled to generate a time-varying current stimulus and a time-varying voltage response, which may be correlated to generate an autocorrelated stimulus, an autocorrelated response, and a cross-correlated response. Finally, the autocorrelated stimulus, the autocorrelated response, and the cross-correlated response may be combined to determine at least one of impedance amplitude, impedance phase, and complex impedance.
Christophersen; Jon P. (Idaho Falls, ID), Motloch; Chester G. (Idaho Falls, ID), Morrison; John L. (Butte, MT), Albrecht; Weston (Layton, UT)
Battelle Energy Alliance, LLC (Idaho Falls, ID)
11/ 381,689
May 4, 2006
GOVERNMENT RIGHTS 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