METHOD OF MEASURING BATTERY PACK CURRENT

A method of measuring current of a battery pack (100) including a rechargeable battery (110), a main switch (121) connected in series to the battery, and a pre-charge switch (122) connected in parallel to the main switch. The method includes: turning on the pre-charge switch and turning off the main switch; measuring a voltage between both terminals of the main switch; calculating a pre-charge current flowing through the pre-charge switch by taking into consideration the resistance of a pre-charge resistor connected in series to the pre-charge switch; measuring current of the battery pack using a current sensor; comparing the current measured using the current sensor with the pre-charge current; and correcting an offset of the current sensor based on results of the comparison.