Patent ID: 6573688
Filing Date: 2003-06-03
Classification: B60L,H02J,Y02T

Abstract:
A battery power source device to which electrical power is supplied from an assembled battery including a combination of a plurality of single cells or unit cells, each of which is a secondary battery, comprising:a current detection resistor connected to the assembled battery in series; transmission means for transmitting a voltage signal generated across the current detection resistor; and a control device separated from the assembled battery, the current detection resistor, and the transmission means, wherein the control device comprises: a discharge current detection unit that receives the voltage signal transmitted via the transmission means and outputs a current signal in proportion to a discharge current flowing through the current detection resistor at the time of discharge from the assembled battery; a first capacitor that totals current signals output from the discharge current detection unit; a pulse generation unit during discharge that, when a voltage of the first capacitor increases to a first threshold value, reverses an output signal and makes the first capacitor discharge, and when the voltage of the first capacitor decreases to a second threshold value, reverses the output signal again to generate a pulse and stops the first capacitor discharging; a charge current detection unit that receives the voltage signal transmitted via the transmission means and outputs a current signal in proportion to a charge current flowing through the current detection resistor at the time of charge of the assembled battery; a second capacitor that totals current signals output from the charge current detection unit; a pulse generation unit during charge that, when a voltage of the second capacitor increases to a third threshold value, reverses an output signal and makes the second capacitor discharge, and when the voltage of the second capacitor decreases to a fourth threshold value, reverses the output signal again to generate a pulse and stops the second capacitor discharging; and a current detection unit that counts the number of pulses output from the pulse generation unit during discharge and the pulse generation unit during charge and calculates a current flowing through the assembled battery at the time of discharge and charge using the counted number of pulses.