US Patent 9312579 Battery pack of excellent cooling efficiency

Disclosed is a battery pack including a plurality of battery cells or unit modules, wherein the battery pack is provided at an upper and lower part thereof with a coolant inlet port and a coolant outlet port, through which a coolant to cool the battery cells or the unit modules, i.e. unit cells, flows from one side to the other side of the battery module in a direction perpendicular to the stacked direction of the unit cells, the battery pack case is further provided with a flow space (‘coolant introduction part’) extending from the coolant inlet port to the battery module and another flow space (‘coolant discharge part’) extending from the battery module to the coolant outlet port, and the coolant outlet port is bent in a lateral direction at an angle of at least 30 degrees to a flow direction of the coolant introduced through the coolant inlet port.