Battery power source device
First Claim
1. 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.
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Accused Products
Abstract
A battery power source device is provided, capable of detecting a charge/discharge current flowing through a secondary battery mounted on an electric vehicle, etc., at low cost, with high reliability, and with high precision. A voltage signal generated across a current detection resistor connected to an assembled battery in series is transmitted to a battery ECU via a transmission means. At the time of discharge from the assembled battery, the voltage signal is detected as a pulse signal using a discharge current detection unit, a first capacitor, and a pulse generation unit during discharge. At the time of discharge, the voltage signal is detected as a pulse signal using a charge current detection unit, a second capacitor, and a pulse generation unit during charge. Event counters calculate this pulse signal at the time of discharge and charge as a current flowing through the assembled battery.
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Citations
7 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification