Battery management system and driving method thereof

摘要

A battery management system including a sensing unit (10) and a main control unit (20) is provided. The sensing unit (10) includes: a plurality of cell relays (111_1,..., 111_40) and a voltage detection unit (116). Each cell relay (111_1,..., 111_40) is configured to be coupled to one of a plurality of cells (CELL1,..., CELL40). The voltage detection unit (116) is coupled to a cell relay (111_1,..., 111_40). The voltage detection unit (116) is configured to: receive a reference voltage (Vref) when each of the plurality of cell relays (111_1,..., 111_40) is turned off; and generate a second voltage by amplifying by a gain the reference voltage (Vref). The main control unit (20) is configured to calculate a valid gain corresponding to a ratio of the second voltage to the reference voltage (Vref) when the temperature of the voltage detection unit (116) is within a threshold temperature range.