Method and apparatus for detecting cell deterioration in an electrochemical cell or battery
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United States of America Patent
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Mar 7, 2017
Grant Date -
Aug 25, 2011
app pub date -
Feb 25, 2010
filing date -
Feb 25, 2010
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Abstract
A testing device contains measuring circuitry adapted to apply time-varying electrical excitation to a cell or battery, to sense a time-varying electrical response, and to thus determine components of complex immittance at n+m discrete frequencies, where n is an integer equal to or greater than two and m is an integer equal to or greater than one. Computation circuitry utilizes measured complex immittance components at the n discrete frequencies to evaluate the elements of a 2n-element equivalent circuit model. It then calculates the complex immittance of this model at the m discrete frequencies and mathematically compares components of the calculated immittances with components of the measured immittances at the m discrete frequencies. The results of this comparison establish the degree of cell deterioration without regard to the battery's manufacturer, group size, or its electrical ratings.
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