| 摘要 |
PURPOSE:To accurately and easily know the residual capacity of a battery without applying a special apparatus to the battery itself, by applying AC voltage to the battery in a state superposed to DC voltage by the battery and measuring the value corresponding to the n-th higher harmonic current of a flowing current. CONSTITUTION:The output AC voltage of an oscillator 2 is applied to a battery to be measured while superposed to DC voltage by the battery through a circuit 7 connected to both terminals of the battery through a potentiostat 3. The higher harmonic component of the current flowing the circuit 7 is taken out as voltage through a filter 4 and measured by a voltmeter 5. As the residual capacity of the battery is reduced, the higher harmonic component in the current of the circuit and the ratio of a fundamental wave component and the higher harmonic component largely change. If the characteristic curve of the residual capacity of the battery to the n-th higher harmonic current corresponding value of the battery to be measured or the same kind of the battery is preliminarily calculated, the residual capacity of the battery to be measured can be known from the measured higher harmonic current corresponding value.
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