Abstract: A rechargeable battery pack that maximizes pack energy density by stacking battery cells. A rechargeable battery pack includes a center frame having a first bottom and a first side wall and supporting the cell stack, a first side frame and a second side frame having a second bottom and a second side wall and coupled to the center frame in a second direction crossing the first direction and supporting a cell narrow side of the cell stack, and a first end frame and a second end frame coupled to both ends of the center frame, the first side frame, and the second side frame in the first direction to support a cell wide side of the cell stack.

Abstract: An injection nozzle configured to spray a thermal interface material to a surface of a rechargeable battery housing, the injection nozzle includes a main nozzle that is configured to receive the thermal interface material from a source and spray the thermal interface material to the surface of the rechargeable battery housing; and a plurality of sub nozzles that are coupled to the main nozzle in a lateral direction, the plurality of sub nozzles being configured receive the thermal interface material from the main nozzle and spray the thermal interface material to the surface of the rechargeable battery housing.