Method to determine remaining capacity of a rechargeable battery

Details Method to determine remaining capacity of a rechargeable battery Method to determine remaining capacity of a rechargeable battery

1998-01-29

1999-09-07

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

320DIG21, H01M 1044

Patent

active

059492171

ABSTRACT:
This method to determine remaining capacity of a rechargeable battery calculates remaining battery capacity by subtracting discharge capacity, computed by integrating battery discharge current, from charge capacity. Voltage of the discharging rechargeable battery is measured, and when battery voltage reaches a first voltage and a lower second voltage, the computed remaining battery capacity is corrected according to a previously established first remaining battery capacity and second remaining battery capacity corresponding to those voltages. The difference between calculated remaining battery capacity or discharge capacity at the first and second voltages is compared to the difference between the previously established first and second remaining battery capacity values, and the first voltage is modified to make those two differences equal.

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