NOVELTY - The secondary battery module (100) has multiple unit cells (110). A rear barrier (120) is located between adjacent ones of the unit cells. A front barrier (130) is located between adjacent ones of the unit cells and spaced from the rear barrier. The spacers (140) are located between the rear barrier and the front barrier. Each of the spacers is provided with a spacer housing and a protrusion protruding from two surfaces of the spacer housing and having an area smaller than an area of the spacer housing. The rear and front barriers have an aluminum metal plate.    USE - Secondary battery module for use in hybrid electric vehicle.    ADVANTAGE - The secondary battery module has the unit cells that are in surface-contact with the rear and front barriers since the spacers are engaged with the spacer holes formed in the rear barrier and the front barrier, thus preventing the unit cells from being damaged due to external impact and vibration. The secondary battery module has cooling channels formed by locating the spacers between the rear barrier and the front barrier by an equal distance, thus dissipating the heat generated from the unit cells. The spacers are formed of insulators and prevent or reduce an electrical short-circuit between the unit cells. The rear barrier can prevent or reduce the electrical short-circuit between the unit cells due to the oxide layer on its surface. The inserts, positioned on an outer circumference of the protrusion of the spacer, are engaged with the insert holes to be close contact with the unit cells, thus securely fixing the spacers without being moved. The occurrence of the swelling phenomenon of the unit cells is minimized by more densely arranging the spacers at the central area of the rear barrier.    DESCRIPTION OF DRAWING(S) - The drawings show a perspective view and an exploded perspective view of the secondary battery module.    Secondary battery module (100)    Unit cell (110)    Rear barrier (120)    Front barrier (130)    Spacer (140)