NOVELTY - Middle- or large-sized battery module comprises two or more unit modules each having plate-shaped battery cells (200), as unit cells, surrounded by a high-strength sheathing member made of synthetic resin or metal. Separable upper and lower frame members (400, 500) are coupled with each other in an assembly-type coupling structure such that the unit modules are vertically mounted in the upper and lower frame members. The battery module further includes sensing unit, bus bars (600, 601) and battery management system (800).    USE - For battery system used as power source for electric vehicles, hybrid electric vehicles, electric motorcycles, or electric bicycles (claimed).    ADVANTAGE - Sensing unit that is capable of minimizing the weight and size of battery cells while effectively reinforcing the low mechanical strength of the battery cells and sensing the operation state of the battery cells, is easily mounted. The module can be manufactured by a simple assembly process without using multiple members for mechanical coupling and electrical connection, thus decreasing the manufacturing costs, and effectively preventing the battery module from being short-circuited or damaged during the manufacture or the operation of the battery module. The middle- or large-sized battery system has desired output and capacity.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a middle- or large-sized battery system having high output and large capacity, constructed by connecting multiple battery modules. Each battery cell is (i) a secondary battery constructed in a structure in which an electrode assembly is mounted in a battery case made of a laminate sheet including a resin layer and a metal layer; or (ii) a pouch-shaped battery cell constructed in a structure in which the electrode assembly is mounted in a pouch-shaped battery case made of an aluminum laminate sheet.    DESCRIPTION OF DRAWING(S) - The figure shows an exploded perspective view showing a middle- or large-sized battery module.    Battery cells (200)    Frame members (400, 500)    Bus bars (600, 601)    Sensing wires (700)    Battery management system (800)