A cylindrical secondary battery module, comprising: a plurality of cylindrical secondary battery cells respectively having a battery case in which an electrode assembly and an electrolyte are accommodated; a cell frame at which the plurality of cylindrical secondary battery cells are disposed; and a lid coupled to the cell frame and having a flame outlet, wherein the cell frame includes: a plurality of plate members bent and coupled to intersect each other; and a space formed between the plurality of plate members so that the cylindrical secondary battery cells are disposed therein, wherein the plurality of plate members include: a first cover bent to form at least one first space; and a second cover coupled to the first cover and bent to form at least one second space, wherein the first cover and the second cover are coupled so that the first space of the first cover and the second space of the second cover are united to form a single closed third space, and the cylindrical secondary battery cell is disposed in the third space, wherein at least one first fitting groove is formed at the first cover, and at least one second fitting groove is formed at the second cover, wherein the second cover is coupled to the first fitting groove by fitting, and the first cover is coupled to the second fitting groove by fitting, wherein the first cover and the second cover are formed with the same shape, and wherein the first cover and the second cover are coupled so that the first fitting groove of the first cover and the second fitting groove of the second cover are disposed to face each other. a plurality of cylindrical secondary battery cells respectively having a battery case in which an electrode assembly and an electrolyte are accommodated; a cell frame at which the plurality of cylindrical secondary battery cells are disposed; and a lid coupled to the cell frame and having a flame outlet, wherein the cell frame includes: a plurality of plate members bent and coupled to intersect each other; and a space formed between the plurality of plate members so that the cylindrical secondary battery cells are disposed therein, wherein the plurality of plate members include: a first cover bent to form at least one first space; and a second cover coupled to the first cover and bent to form at least one second space, wherein the first cover and the second cover are coupled so that the first space of the first cover and the second space of the second cover are united to form a single closed third space, and the cylindrical secondary battery cell is disposed in the third space, wherein at least one first fitting groove is formed at the first cover, and at least one second fitting groove is formed at the second cover, wherein the second cover is coupled to the first fitting groove by fitting, and the first cover is coupled to the second fitting groove by fitting, wherein the first cover and the second cover are formed with the same shape, and wherein the first cover and the second cover are coupled so that the first fitting groove of the first cover and the second fitting groove of the second cover are disposed to face each other. a plurality of plate members bent and coupled to intersect each other; and a space formed between the plurality of plate members so that the cylindrical secondary battery cells are disposed therein, wherein the plurality of plate members include: a first cover bent to form at least one first space; and a second cover coupled to the first cover and bent to form at least one second space, wherein the first cover and the second cover are coupled so that the first space of the first cover and the second space of the second cover are united to form a single closed third space, and the cylindrical secondary battery cell is disposed in the third space, wherein at least one first fitting groove is formed at the first cover, and at least one second fitting groove is formed at the second cover, wherein the second cover is coupled to the first fitting groove by fitting, and the first cover is coupled to the second fitting groove by fitting, wherein the first cover and the second cover are formed with the same shape, and wherein the first cover and the second cover are coupled so that the first fitting groove of the first cover and the second fitting groove of the second cover are disposed to face each other. a first cover bent to form at least one first space; and a second cover coupled to the first cover and bent to form at least one second space, wherein the first cover and the second cover are coupled so that the first space of the first cover and the second space of the second cover are united to form a single closed third space, and the cylindrical secondary battery cell is disposed in the third space, wherein at least one first fitting groove is formed at the first cover, and at least one second fitting groove is formed at the second cover, wherein the second cover is coupled to the first fitting groove by fitting, and the first cover is coupled to the second fitting groove by fitting, wherein the first cover and the second cover are formed with the same shape, and wherein the first cover and the second cover are coupled so that the first fitting groove of the first cover and the second fitting groove of the second cover are disposed to face each other.