Battery self-discharge current measurement apparatus and operating method thereof
A battery life prediction apparatus according to an embodiment disclosed herein includes a processor and memory having programmed thereon instructions that, when executed, are configured to cause the processor to obtain information about a charge end voltage of a battery corresponding to a charge protocol and predict a life of the battery corresponding to the charge protocol based on the information about the charge end voltage of the battery corresponding to the charge protocol.
1. A battery self-discharge current measurement apparatus comprising:
a first resistor connected to a battery;
a voltage generator configured to generate a second output voltage based on a first output voltage generated based on a voltage applied to the battery and the first resistor and a second output signal generated by converting the first output voltage, and apply the second output voltage to a second resistor; and
a controller configured to monitor a current applied to the second resistor.
2. The battery self-discharge current measurement apparatus of claim 1 , wherein the voltage generator is further configured to generate a first output signal by converting the first output voltage from analog to digital, and generate a second output signal by converting the first output signal from digital to analog.
3. The battery self-discharge current measurement apparatus of claim 1 , wherein the voltage generator comprises:
a first comparator configured to receive the voltage applied to the battery and the first resistor;
an analog-to-digital converter (ADC) configured to receive the first output voltage of the first comparator and convert the first output voltage from analog to digital as the first output signal;
a digital-to-analog converter (DAC) configured to receive the first output signal of the ADC and convert the first output signal of the ADC from digital to analog as a second output signal;
a second comparator configured to compare the first output voltage of the first comparator with the second output signal of the DAC; and
the second resistor connected between the first resistor and the second comparator.
4. The battery self-discharge current measurement apparatus of claim 3 , wherein the controller is further configured to monitor a current applied to the second resistor based on a potential difference between the second output voltage of the second comparator and the voltage applied to the first resistor.
5. The battery self-discharge current measurement apparatus of claim 4 , wherein the controller is further configured to determine that the monitored current is a self-discharge current of the battery when a value of the monitored current value is constant.
6. The battery self-discharge current measurement apparatus of claim 5 , wherein the controller is further configured to set a reference voltage of the DAC based on the monitored current.
7. The battery self-discharge current measurement apparatus of claim 6 , wherein the controller is further configured to set the reference voltage of the DAC based on the calculated current value and a minimum resolution of the DAC when the value of the monitored current is different from a reference current value.
8. An operating method of a battery self-discharge current measurement apparatus, the operating method comprising:
generating a first output voltage based on a voltage applied to a battery and a first resistor connected to the battery;
generating a first output signal converting the first output voltage from analog to digital;
generating a second output signal converting the first output signal from digital to analog;
generating a second output voltage based on the first output voltage and the second output signal; and
monitoring a current applied to a second resistor to which the second output voltage is applied.
9. The operating method of claim 8 , wherein monitoring the current applied to the second resistor to which the second output voltage is applied comprises monitoring the current applied to the second resistor arranged between the first resistor and a second comparator.
10. The operating method of claim 8 , wherein monitoring the current applied to the second resistor to which the second output voltage is applied comprises monitoring the current applied to the second resistor based on a potential difference between the second output voltage and the voltage applied to the first resistor.
11. The operating method of claim 9 , wherein monitoring the current applied to the second resistor to which the second output voltage is applied comprises determining that the monitored current is a self-discharge current of the battery when a value of the monitored current value is constant.
12. The operating method of claim 9 , further comprising setting a reference voltage of the DAC based on the monitored current.
13. The operating method of claim 12 , wherein the setting of the reference voltage of the DAC based on the result of the monitoring comprises setting the reference voltage of the DAC based on a calculated current value and a minimum resolution of the DAC when the value of the monitored current is different from a reference current value.