Battery Control and Fault Detection Method.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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This is a method for control, fault detection, fault isolation, and state-of-health monitoring of batteries and battery arrays. The method consists of measuring all of the battery, cell, or cell group voltages, using statistics to determine a means voltage and a standard deviation voltage, then comparing all of the measured voltage deviates from the mean voltage by an arbitrary amount number of standard deviations corrective action can be implemented or an alarm signal given. The measurements need to be made rapidly enough to eliminate battery or cell voltage changes due to state of charge of temperature changes and, in most cases, require a computerized data collectionreduction system. Absolute high andor low voltage limits can be included to prevent catastrophic events. The concept can be expended to include similar temperature, pressure andor battery current measurements in an array. Patents
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