APPARATUS AND METHOD FOR CONTROLLING BATTERY

An apparatus for controlling a battery according to one embodiment of the present invention is located in a battery system including a plurality of batteries, and may comprise: at least one processor; and memory storing at least one instruction that is executed through the at least one processor. The at least one instruction may comprise: an instruction for monitoring the voltages of online batteries, connected to a DC bus and being charged, during a charging process of the battery system; an instruction for disconnecting the connection between the DC bus and at least one battery, among the plurality of online batteries being charged, when the corresponding online battery satisfies a predefined target voltage, and thereby switching the corresponding online battery to an offline state; and an instruction for controlling cell balancing for at least one of the offline batteries switched to the offline state.