- Battery Discharge Capacity Calculation by Temperature Measurement
- Battery capacity is measured in the unit of miliampere hour (mAh) (current x time). In order to do this, the discharge current of a battery is measured and integrated (multiplied) over the duration of the discharge. This paper proposes a method to calculate battery capacity by first measuring the temperature of a load resistor which is used to discharge the battery. The load resistor has a known/characterized Thermal Resistance (Rth) (degC.W-1) value. The temperature is then integrated over time and solved using a thermal equation and thus obtaining the battery discharge capacity. The benefit of this type of discharge capacity calculation method is a series resistor (which causes a series voltage drop) is not required in the main current path.
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