A battery module configured to have a structure in which a plurality of unit modules, each of which comprises more than one battery cell, is arranged in a lateral direction comprising: a cooling member mounted at a top or a bottom of the battery module to remove heat generated from the battery cells during charge and discharge of the battery cells, and cooling fins disposed between the respective unit modules in a state in which opposite sides of each of the cooling fins are in tight contact with corresponding ones of the unit modules, wherein the cooling member comprises: a thermal conduction member disposed at the top or the bottom of the battery module, the thermal conduction member comprising an upper plate and a lower plate, which are separated from each other; and a coolant conduit comprising a first conduit and a second conduit configured to have a hollow structure in which a coolant flows, the first conduit being disposed between the upper plate and the lower plate, the second conduit being integrally connected to the first conduit, the second conduit being disposed at a front and/or a rear of the battery module, and wherein the first conduit comprises two or more pipes, wherein second conduits are disposed at the front and the rear of the battery module, wherein each of the battery cells is a plate-shaped secondary battery, and wherein the plate-shaped secondary battery is a pouch-shaped secondary battery configured to have a structure in which an electrode assembly of a cathode/separator/anode structure is mounted in a battery case formed of a laminate sheet comprising a resin layer and a metal layer, characterized in that the cooling fins are bent such that the cooling fins contact the thermal conduction member in a surface contact fashion, and each of the cooling fins is formed in a "┐" shape in vertical section and formed of a heat conductive metal plate. a cooling member mounted at a top or a bottom of the battery module to remove heat generated from the battery cells during charge and discharge of the battery cells, and cooling fins disposed between the respective unit modules in a state in which opposite sides of each of the cooling fins are in tight contact with corresponding ones of the unit modules, a thermal conduction member disposed at the top or the bottom of the battery module, the thermal conduction member comprising an upper plate and a lower plate, which are separated from each other; and a coolant conduit comprising a first conduit and a second conduit configured to have a hollow structure in which a coolant flows, the first conduit being disposed between the upper plate and the lower plate, the second conduit being integrally connected to the first conduit, the second conduit being disposed at a front and/or a rear of the battery module, and wherein the first conduit comprises two or more pipes, wherein second conduits are disposed at the front and the rear of the battery module, wherein each of the battery cells is a plate-shaped secondary battery, and wherein the plate-shaped secondary battery is a pouch-shaped secondary battery configured to have a structure in which an electrode assembly of a cathode/separator/anode structure is mounted in a battery case formed of a laminate sheet comprising a resin layer and a metal layer, characterized in that the cooling fins are bent such that the cooling fins contact the thermal conduction member in a surface contact fashion, and each of the cooling fins is formed in a "┐" shape in vertical section and formed of a heat conductive metal plate.