Apparatus and method for utilizing polarization voltage to determine charge state of a battery
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United States of America Patent
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May 25, 1993
Grant Date -
N/A
app pub date -
May 22, 1991
filing date -
May 22, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for measuring charge state of a battery having multiple cells includes a transmitter that is connected to the battery to apply a test signal across the battery. This test signal is preferably a continuous square wave signal having a frequency less than 3 Hz. The test signal alternates between a voltage adequate to charge the battery and a lower voltage, and the charging voltage is retained for a time sufficient to allow a polarization voltage to develop across individual cells. A receiver is connected to the cell to monitor the polarization voltage across a cell as it develops in response to the test signal. This polarization voltage can be monitored for example using a DC voltmeter, or by displaying the voltage versus time waveform. In either case an accurate indication of the state of the charge of the cell is provided.
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