Battery management system and driving method thereof

A battery management method for managing a battery comprising at least one pack comprising a plurality of cells, the method comprising:

• calculating by using a micro controller unit (MCU) an estimated cell voltage by using a pack voltage sensing error, a cell voltage deviation, and a cell voltage;
• calculating an estimated cell resistance by adding a pack assembly resistance to an internal resistance of the cell;
• and
• calculating a pack output by using the estimated cell voltage, the estimated cell resistance, and one of a fully charged cell voltage and fully discharged cell voltage,
• wherein the pack assembly resistance is a resistance of elements of the pack other than the cells.

A battery management method, for managing a battery pack comprising a plurality of cells, the method comprising:

• calculating by using a micro controller unit (MCU) an estimated cell voltage of the pack;
• calculating an estimated cell resistance of the pack;
• and
• calculating a pack output of the pack by using an estimated cell voltage of the plurality of cells, an estimated cell resistance of the plurality of cells, and one oft the fully charged cell voltage of the pack and the fully discharged cell voltage of the pack,
• wherein the calculating of the estimated cell voltage comprises detecting the cell voltage, the pack voltage sensing error, and the cell voltage deviation of the pack, while the pack is discharging.