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Title: Method, system and computer-readable media for measuring impedance of an energy storage device

Real-time battery impedance spectrum is acquired using a one-time record. Fast Summation Transformation (FST) is a parallel method of acquiring a real-time battery impedance spectrum using a one-time record that enables battery diagnostics. An excitation current to a battery is a sum of equal amplitude sine waves of frequencies that are octave harmonics spread over a range of interest. A sample frequency is also octave and harmonically related to all frequencies in the sum. A time profile of this sampled signal has a duration that is a few periods of the lowest frequency. A voltage response of the battery, average deleted, is an impedance of the battery in a time domain. Since the excitation frequencies are known and octave and harmonically related, a simple algorithm, FST, processes the time profile by rectifying relative to sine and cosine of each frequency. Another algorithm yields real and imaginary components for each frequency.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
1236563
Assignee:
Battelle Energy Alliance, LLC INL
Patent Number(s):
9,244,130
Application Number:
13/438,741
Contract Number:
AC07-05ID14517
Resource Relation:
Patent File Date: 2012 Apr 03
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 97 MATHEMATICS AND COMPUTING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Works referenced in this record:

Effects of Reference Performance Testing during Aging Using Commercial Lithium-Ion Cells
journal, January 2006
  • Christophersen, Jon P.; Ho, Chinh D.; Motloch, Chester G.
  • Journal of The Electrochemical Society, Vol. 153, Issue 7, p. A1406-A1416
  • DOI: 10.1149/1.2201473

Accurate method of representation of high-voltage measuring systems and its application in high-impulse-voltage measurements
journal, March 1989
  • Nikolopoulos, P. N.; Topalis, F. V.
  • IEE Proceedings A (Physical Science, Measurement and Instrumentation, Management and Education), Vol. 136, Issue 2, p. 66-72
  • DOI: 10.1049/ip-a-2.1989.0010

Comparison of impedance measurements in a DSP using ellipse-fit and seven-parameter sine-fit algorithms
journal, November 2009

Model validation approaches for nonlinear feedback systems using frequency response measurements
conference, January 1999
  • Smith, R.; Banaszuk, A.; Dullerud, G.
  • Decision and Control, 1999. Proceedings of the 38th IEEE Conference on
  • DOI: 10.1109/CDC.1999.830202