Patent ID: 7880432

Claim:
A battery management system coupled to a battery in which a plurality of battery cells are formed as one pack, wherein the battery includes a first sub-pack having first and second battery cells among the plurality of battery cells, said battery management system including a cell voltage measurer for measuring analog voltages of the battery cells, a pack voltage measurer for measuring an analog voltage value between output terminals of the battery, and a pack current measurer for measuring a pack current of the battery; said cell voltage measurer comprising: first and second relays coupled to respective output terminals of the first and second battery cells of the first sub-pack for transmitting cell voltages to the respective output terminals of the first and second battery cells of the first sub-pack in response to respective first and second control signals; a third relay for transmitting the cell voltage received through one of the first and second relays in response to a third control signal; a first charging unit for storing the cell voltage transmitted from the third relay; a fourth relay for transmitting the cell voltage stored in the first charging unit in response to a fourth control signal; and an A/D converter for converting the transmitted cell voltage of the fourth relay into digital data; wherein the A/D converter comprises first, second, and third input terminals for receiving the outputs of the cell voltage measurer, a fourth input terminal for receiving the output of the pack voltage measurer, and a fifth input terminal for receiving the output of the pack current measurer, and wherein the A/D converter sequentially converts the input signals of the first, second, fourth, fifth and third input terminals into digital data.