System and method for improved accuracy in battery resistance measurement systems
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United States of America Patent
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Feb 23, 2016
Grant Date -
Sep 18, 2014
app pub date -
Feb 27, 2014
filing date -
Mar 14, 2013
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Abstract
A method is disclosed for reducing an influence of voltage ripple on battery test measurements of battery cells coupled in series that form a direct current (DC) bus. A calibration operation is used to obtain a ratiometric difference between first and second series connected battery cells of the DC bus, which is indicative of a variance in their respective output voltages. Voltage measurements across each of the two cells may then be obtained at least substantially simultaneously. The ratiometric difference may be used to modify the voltage measurement taken across the second cell to produce a modified voltage measurement of the second cell. A difference between the measured voltage across the first battery cell and the modified voltage measurement may then be determined, which represents a filtered DC test voltage that has substantially all of the voltage ripple removed therefrom.
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