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

Patent · Tue Mar 09 00:00:00 EST 2010

OSTI ID:1014497

Christophersen, Jon P ^[1]; Motloch, Chester G ^[1]; Morrison, John L ^[2]; Albrecht, Weston ^[3]

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1. Idaho Falls, ID
2. Butte, MT
3. Layton, UT

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.

• Research Organization: Idaho National Laboratory (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC07-05ID14517
• Assignee: Battelle Energy Alliance, LLC (Idaho Falls, ID)
• Patent Number(s): 7,675,293
• Application Number: U S Patent Application 11/381,689
• OSTI ID: 1014497
• Country of Publication: United States
• Language: English