| 摘要 |
PURPOSE:To make it possible to accurately confirm the residual quantity of a battery, by providing a charge and discharge current detection means, a temp. detection means and an operational control means and correcting a detection value on the basis of the change in temp. and a current with due regard to the efficiency of charge and discharge currents. CONSTITUTION:In a charge and discharge current detection means, a battery residual quality confirming circuit A allows an amplifying circuit 2 to amplify the voltage between both terminals of the resistor R inserted in a battery B in series and the amplified voltage is converted to a digital signal by an A/D converter circuit 3 and charge and discharge currents are detected by an operation circuit 4. In a temp. detection means, the voltage between both terminals of a thermister TH is amplified by an amplifying circuit 8 and converted to a digital signal by the circuit 3 and temp. is detected by the circuit 4. The outputs of the charge and discharge current detection means and the temp. detection means are applied to an operational control circuit 4 to calculate the charge efficiency to a charge current, the discharge efficiency to a discharge current and the charge and discharge efficiency to temp. and the value, which is obtained by correcting the residual capacity of the battery at the point of time when charge and discharge are started by the calculated amounts, is added to make it possible to confirm the residual quantity of the battery.
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