Voltage detecting apparatus

A voltage detecting apparatus comprising:

• a plurality of unit cells connected in series so as to structure a high-voltage battery for a car, and segmented to at least one cell block including at least one unit cell;
• a voltage detecting device arranged corresponding to one or more cell blocks for detecting a whole voltage value between both ends of the cell block and a voltage value between both ends of the unit cell;
• and
• a control device controlling to detect the whole voltage value between the both ends of the cell block corresponding to the voltage detecting device and the voltage value between the both ends of one unit cell selected randomly from the cell block, and judging whether or not the high-voltage battery of the car has a malfunction based on the detected whole voltage value between the both ends of the cell block and the detected voltage value between the both ends of one unit cell.