NOVELTY - Battery module (100) includes upper and lower fixing plates (300d, 300e) extending along a horizontal side of battery array formed by outermost horizontal side surfaces of battery cells (10), where upper and lower fixing plates have side holders (360) vertically extending along a portion of a vertical side of the battery array formed by outermost vertical side surfaces of the battery cells.    USE - Battery module used e.g. for electric vehicle.    ADVANTAGE - The battery module does not need specific side fixing components. It has a structure that can effectively discharge heat generated from battery cells while maintaining sufficient strength for fixing a battery array. The heat produced from the battery cells can be easily discharged through the heat dissipation holes, even after the battery cells stop operating.    DETAILED DESCRIPTION - Battery module (100) comprises battery array comprising battery cells (10) stacked together, where each battery cell includes a terminal surface exposing an electrode terminal and a vent, a bottom surface opposite to the terminal surface, and horizontal and vertical side surfaces extending between the bottom surface and the terminal surface; end plates (200) adjacent to outer ends of the battery array formed by the terminal surfaces of the battery cells, where end plates have electrode openings exposing the electrode terminals; upper and lower fixing plates (300d, 300e) extending along a horizontal side of the battery array formed by outermost horizontal side surfaces of the battery cells, where upper and lower fixing plates have side holders (360) vertically extending along a portion of a vertical side of the battery array formed by outermost vertical side surfaces of the battery cells; and horizontal insulating component(s) (600a) located between adjacent ones of the stacked battery cells. The upper and lower fixing plates have heat dissipation holes.    DESCRIPTION OF DRAWING(S) - The drawing is a perspective view of battery module with vertical fixing plate.    Battery cells (10)    Battery module (100)    End plates (200)    Upper and lower fixing plates (300d, 300e)    Side holders (360)    Horizontal insulating component (600a)