A battery module comprising: a unit module assembly comprising unit modules (150a, 150b), each of which comprises a plurality of battery cells or a plurality of cell assemblies, each of which comprises two or more battery cells, as unit cells, the unit modules (150a, 150b) being arranged while being adjacent to each other, each of the unit modules (150a, 150b) having electrode terminals (151, 152, 153, 154, 155, 156, 157, 158) arranged at one side thereof; a battery disconnect unit arranged at one side of the unit module assembly, the battery disconnect unit having terminal connection parts (161, 162, 163, 164, 165) arranged at the same side as the electrode terminals (151, 152, 153, 154, 155, 156, 157, 158); a module case in which the unit modules (150a, 150b) of the unit module assembly are mounted, the electrode terminals (151, 152, 153, 154, 155, 156, 157, 158) of the unit modules (150a, 150b) being exposed through the module case; and a bus bar assembly comprising a cover plate mounted on the electrode terminals (151, 152, 153, 154, 155, 156, 157, 158) of the unit modules (150a, 150b) at the module case, the cover plate being formed of an insulative material, and two or more bus bars (350, 360, 361, 362, 363) mounted to the cover plate, characterized in that each of the battery cells is a plate-shaped battery cell, preferably, is configured to have a structure in which an electrode assembly is mounted in a laminate battery case, each of the cell assemblies is configured to have a structure in which a cell cover (111, 112) covers outsides of the two or more battery cells excluding the electrode terminals (110a, 110b), and each of the two unit cells are mounted in a cartridge to constitute a unit stack, and each of the unit modules (150a, 150b) comprises a plurality of unit stacks being stacked adjacent to each other. a unit module assembly comprising unit modules (150a, 150b), each of which comprises a plurality of battery cells or a plurality of cell assemblies, each of which comprises two or more battery cells, as unit cells, the unit modules (150a, 150b) being arranged while being adjacent to each other, each of the unit modules (150a, 150b) having electrode terminals (151, 152, 153, 154, 155, 156, 157, 158) arranged at one side thereof; a battery disconnect unit arranged at one side of the unit module assembly, the battery disconnect unit having terminal connection parts (161, 162, 163, 164, 165) arranged at the same side as the electrode terminals (151, 152, 153, 154, 155, 156, 157, 158); a module case in which the unit modules (150a, 150b) of the unit module assembly are mounted, the electrode terminals (151, 152, 153, 154, 155, 156, 157, 158) of the unit modules (150a, 150b) being exposed through the module case; and a bus bar assembly comprising a cover plate mounted on the electrode terminals (151, 152, 153, 154, 155, 156, 157, 158) of the unit modules (150a, 150b) at the module case, the cover plate being formed of an insulative material, and two or more bus bars (350, 360, 361, 362, 363) mounted to the cover plate, characterized in that each of the battery cells is a plate-shaped battery cell, preferably, is configured to have a structure in which an electrode assembly is mounted in a laminate battery case, each of the cell assemblies is configured to have a structure in which a cell cover (111, 112) covers outsides of the two or more battery cells excluding the electrode terminals (110a, 110b), and each of the two unit cells are mounted in a cartridge to constitute a unit stack, and each of the unit modules (150a, 150b) comprises a plurality of unit stacks being stacked adjacent to each other.