Abstract：The constant current discharge method is recommended by domestic and foreign standards as a common method to measure capacitance of supercapacitors. The principle and measurement circuit of the method was introduced in the paper. Influences of the charging and discharge current, the initial terminal voltage of the capacitor were analyzed based on experiments. And uncertainty of the capacitance measurement was evaluated. Results show that the discharge current has a great influence on the measurement, and the capacitance decreases as the discharge current increases. The charging current and initial voltage have a small effect. The expanded uncertainty of capacitance measurement is 2.2% by constant current discharge method with a confidence factor of 2.
2020, Vol. 41 
