Apparatus and method for calculating precharge resistance of battery pack
View Patent ↗Disclosed are an apparatus and a method for calculating a precharge resistance of a battery pack. The apparatus for calculating a precharge resistance of a battery pack according to the present invention includes: a load resistor configured to be connected between a battery pack and a precharge resistor in series; a voltage measuring unit configured to measure a no-load voltage in a no-load state in which the load resistor is not installed in the battery pack or a load voltage applied to the load resistor when the load resistor has a predetermined current value in a load state in which the load resistor is installed in the battery pack; and a precharge resistance calculating unit configured to calculate the precharge resistor of the battery pack using the no-load voltage of the battery pack, the load voltage, and the predetermined current value.
1. An apparatus for calculating a precharge resistance of a battery pack, comprising:
a load resistor configured to be connected between a battery pack and a precharge resistor in series;
a voltage measuring unit configured to measure a no-load voltage in a no-load state in which the load resistor is not installed in the battery pack or a load voltage applied to the load resistor when a current having a predetermined current value flows in the load resistor in a load state in which the load resistor is installed in the battery pack; and
a precharge resistance calculating unit configured to calculate a resistance value of a precharge resistor of the battery pack using the no-load voltage of the battery pack, the load voltage, and the predetermined current value.
2. The apparatus of claim 1 , wherein the no-load voltage is an open circuit voltage (OCV) of the battery pack.
3. The apparatus of claim 1 , wherein the load resistor is a variable resistor which controls a resistance value to adjust a current value of the current flowing in the load resistor.
4. The apparatus of claim 1 , wherein the precharge resistance calculating unit gradually increases the resistance value of the load resistor from 0 ohm in the load state to control the current flowing in the load resistor to have the predetermined current value.
5. The apparatus of claim 4 , wherein the predetermined current value is 1 A.
6. The apparatus of claim 1 , further comprising:
a current measuring unit disposed between the battery pack and the load resistor or between the load resistor and the precharge resistor and configured to measure a current.
7. The apparatus of claim 6 , wherein the current measuring unit is a current sensor.
8. The apparatus of claim 1 , further comprising:
a switch control unit connected to the battery pack in series and configured to control a switch performing an opening and closing operation of a line provided with the precharge resistor.
9. The apparatus of claim 8 , wherein the switch control unit performs an operation of closing the switch so as to measure the no-load voltage or the load voltage in the no-load state or the load state.
10. The apparatus of claim 8 , wherein the switch is a precharge relay switch.
11. The apparatus of claim 1 , wherein the precharge resistance calculating unit calculates the resistance value of the precharge resistor based on the following Equation:
Rp =( V _1− V _2)/ A [Equation]
where Rp represents the precharge resistance, V_ 1 represents the no-load voltage, V_ 2 represents the load voltage, and A represents the predetermined current value.
12. A method for calculating a precharge resistance of a battery pack, comprising:
measuring a no-load voltage in a no-load state in which the load resistor is not installed in the battery pack or a load voltage applied to the load resistor when a current having a predetermined current value flows in the load resistor in a load state in which the load resistor is installed in the battery pack; and
calculating a resistance value of the precharge resistor of the battery pack using the no-load voltage of the battery pack, the load voltage, and the predetermined current value.
13. The method of claim 12 , wherein the no-load voltage is an open circuit voltage (OCV) of the battery pack.
14. The method of claim 12 , further comprising:
controlling a resistance value to adjust a current value of the current flowing in the load resistor.
15. The method of claim 14 , wherein in the calculating, the resistance value of the load resistor is gradually increased from 0 ohm in the load state to control the current flowing in the load resistor to have the predetermined current value.
16. The method of claim 15 , wherein the predetermined current value is 1 A.
17. The method of claim 12 , further comprising:
measuring a current between the battery pack and the load resistor or between the load resistor and the precharge resistor.
18. The method of claim 12 , further comprising:
controlling a switch which is connected to the battery pack in series and performs an opening and closing operation of a line provided with the precharge resistor.
19. The method of claim 18 , wherein in the controlling of the switch, an operation of closing the switch is performed so as to measure the no-load voltage or the load voltage in the no-load state or the load state of the battery.
20. The method of claim 12 , wherein in the calculating, the precharge resistance is calculated based on the following Equation:
Rp =( V _1− V _2)/1 A [Equation]
where Rp represents the precharge resistance, V_ 1 represents the no-load voltage, V_ 2 represents the load voltage, and A represents the predetermined current value.