A battery module, group battery and vehicle that is used for secondary cell's frame and includes frame is disclosed. The frame that should be used for secondary cell has the modified structure in order to prevent that the cooling plate is out of shape or twists owing to the shrink of main frame. A frame includes for secondary cell: cooling plate, cooling plate are made by the heat conduction material and are had the plate -type and describe, and the main frame, the main frame has a plurality of unit frame that separate each other with the predetermined distance on the horizontal direction, and the edge of encirclement cooling plate is constructed into and made by the material that is different from the cooling plate to the main frame.