NOVELTY - The assembly (5) has an upper panel (26) connecting upper ends of side panels (21, 22). Multiple protrusions protrude from the side panels, and are coupled with guide grooves (12a). A dividing panel connects the side panels between the upper panel and a lower panel. The protrusions are inserted into the guide grooves to allow barriers (20) mounted to a frame (10) to move in longitudinal direction of the frame. Multiple batteries (30) are accommodated within the barriers and the frame. The barriers are stacked such that the dividing panels of the adjacent barriers face one another.    USE - Battery assembly for use as an energy source for a hybrid electrical vehicle (HEV), an electrical vehicle (EV) and a motor driven machine. Uses include but are not limited to wireless cleaner, electromotive bicycle, electrical scooter and power generating facilities.    ADVANTAGE - The assembly ensures that positioning of the batteries within the frame supporting the batteries are precisely maintained, so that variations in the relative positioning of the batteries are minimized and mechanical and electrical connection structures of the battery assembly can be stabilized. The assembly can discharge-out the air inside the frame and cool air from the outside to flow into the battery assembly so as to dissipate heat from the batteries, thus maintaining better circulation and better performance of the battery assembly. The protrusions of the barriers are coupled and guided by guide grooves of the frame when the barriers are mounted on the frame, so that the barriers can slidably move along the longitudinal direction of the frame, thus performing operation of installing the barriers and the batteries on the frame easily. The assembly ensures that vertical movement of the protrusions is restricted while the protrusions are slidably supported so as to limit vertical movement of the barriers with respect to the frame, so that the batteries can be stably supported by using a simple structure, where uniform height of the batteries can be set, thus facilitating connecting operation of the batteries and maintaining a stable electrical connection between the batteries.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of elements of a battery assembly.    Battery assembly (5)    Frame (10)    Guide grooves (12a)    Barriers (20)    Side panels (21, 22)    Upper panel (26)    Batteries (30)