Patent ID: 7589492

Claim:
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 the at least one or more cell blocks for detecting a voltage value between both ends of the at least one or more cell blocks and a voltage value between both ends of one of the at least one unit cell; and a control device controlling to detect the voltage value between both ends of the at least one or more cell blocks corresponding to the voltage detecting device and the voltage value between both ends of one of the at least one unit cell selected randomly from the at least one or more cell blocks, and judging whether or not the high-voltage battery of the car has a malfunction based on the detected voltage value between both ends of the at least one or more cell blocks and the detected voltage value between both ends of the selected one unit cell, wherein the control device judges that the high-voltage battery for the car has the malfunction when a difference value by comparing a product, which is the voltage value between both ends of the selected one unit cell multiplied by a number of the unit cells in the at least one or more cell blocks, and the voltage value of both ends of the at least one or more cell blocks is not smaller than a predetermined value.