Method of measuring remaining capacity of a storage cell by comparing impedance plot characteristics
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United States of America Patent
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Aug 31, 1993
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N/A
app pub date -
May 31, 1991
filing date -
May 31, 1991
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Abstract
The remaining capacity of a storage cell, particularly a valve regulated lead-acid cell, is determined by measuring its impedance at typically two or three relatively low frequencies f, e.g., frequencies in the approximate range of 0.001 to 1.0 Hz. In one application, the imaginary part Z' of the complex impedance Z(=Z'+jZ') is plotted vs. f.sup.-1/2, whereby the intercept Z'.sub.o (at f.sup.-1/2 =0) of the bestfitting straight line of the plot is a measure of the cell's remaining capacity. In another application, the slope (dZ'/dZ') of a plot of the imaginary part Z' vs. real part Z' of the complex impedance Z, again as measured at relatively low frequencies f, is a measure of the cell's remaining capacity.
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