A battery cooling system may include a first cooling device including a first radiator and a first water pump connected through a first coolant line and circulating a coolant in the first coolant line to cool at least one electrical component and at least one motor; a second cooling device including a second radiator and a second water pump connected through a second coolant line and circulating the coolant in the second coolant line; a battery module mounted on a battery coolant line selectively connectable to the second coolant line through a valve; and a chiller mounted on the battery coolant line and through which the coolant passes, connected to a refrigerant line of an air conditioning device through a refrigerant connection line, and making the coolant which selectively flows exchange heat with a refrigerant supplied from the air conditioning device to control a temperature of the coolant.