Patent ID: 8722224

Claim:
A middle or large-sized battery pack configured to have a structure in which two or more battery modules, each comprising a plurality of battery cells which can be charged and discharged, are mounted in a space defined between a pack case and a base plate, comprising: cooling members, each cooling member comprising: a heat dissipation fin formed in a plate shape and disposed in contact with outsides of corresponding ones of the battery cells; and a coolant conduit connected to a lower end of the heat dissipation fin to allow a coolant to flow therealong, the cooling conduit configured to have a hollow structure, including one of a polygonal hollow structure, an elliptical hollow structure or a circular hollow structure in vertical section, through which the coolant flows and having two or more protrusions extending from an inner surface of the cooling conduit in a direction parallel to the flow direction of the coolant so as to maximize a contact area between the coolant conduit and the coolant; the cooling members mounted at interfaces between the battery cells and configured to have a structure in which the coolant conduit is integrally formed in one piece with the heat dissipation fin, wherein the base plate, located below the battery modules, is configured to form a coolant flow channel having a coolant flow direction corresponding to the coolant flow direction in the coolant conduit, wherein the pack case is coupled to the base plate in a state in which the battery modules are mounted on the base plate, and wherein a coolant to remove heat generated from the battery cells is introduced from one side of the coolant flow channel of the base plate, flows through the coolant conduits of the respective cooling members, and is then discharged to the other side of the coolant flow channel of the base plate.