A battery module comprising: a one or more of secondary batteries; a cooling plate having an uneven plate shape and including a one or more of grooves formed on a top surface thereof; a one or more cell covers, wherein each of the one or more cell covers accommodates at least one secondary battery in an internal space and is inserted in one of the grooves, to stand up on the upper portion of the cooling plate, wherein each of the one or more cell covers comprising: a first side plate and a second side plate facing each other to form opposite side surfaces of the internal space;a top plate forming a top surface of the internal space and connecting upper edges of the first side plate and the second side plate, wherein the top plate of the cell cover comprises a first top plate extending from an upper edge of the first side plate and a second top plate extending from an upper edge of the second side plate to face the first top plate, and the first top plate and the second top plate are detachably coupled to each other, wherein the first top plate and the second top plate include hooks and hook engagement holes, respectively, configured to be engaged with each other in a hooking manner; and a first bottom plate extending from a lower edge of the first side plate and a second bottom plate extending from a lower edge of the second side plate to face the first bottom plate, the first bottom plate and the second bottom plate forming a bottom surface of the internal space, wherein the first bottom plate and the second bottom plate are inclined downwardly at an angle with respect to a horizontal plane, respectively and end portion of the first bottom plate and an end portion of the second bottom plate are spaced apart from each other. a one or more of secondary batteries; a cooling plate having an uneven plate shape and including a one or more of grooves formed on a top surface thereof; a one or more cell covers, wherein each of the one or more cell covers accommodates at least one secondary battery in an internal space and is inserted in one of the grooves, to stand up on the upper portion of the cooling plate, wherein each of the one or more cell covers comprising: a first side plate and a second side plate facing each other to form opposite side surfaces of the internal space;a top plate forming a top surface of the internal space and connecting upper edges of the first side plate and the second side plate, wherein the top plate of the cell cover comprises a first top plate extending from an upper edge of the first side plate and a second top plate extending from an upper edge of the second side plate to face the first top plate, and the first top plate and the second top plate are detachably coupled to each other, wherein the first top plate and the second top plate include hooks and hook engagement holes, respectively, configured to be engaged with each other in a hooking manner; and a first bottom plate extending from a lower edge of the first side plate and a second bottom plate extending from a lower edge of the second side plate to face the first bottom plate, the first bottom plate and the second bottom plate forming a bottom surface of the internal space, wherein the first bottom plate and the second bottom plate are inclined downwardly at an angle with respect to a horizontal plane, respectively and end portion of the first bottom plate and an end portion of the second bottom plate are spaced apart from each other. a first side plate and a second side plate facing each other to form opposite side surfaces of the internal space;a top plate forming a top surface of the internal space and connecting upper edges of the first side plate and the second side plate, wherein the top plate of the cell cover comprises a first top plate extending from an upper edge of the first side plate and a second top plate extending from an upper edge of the second side plate to face the first top plate, and the first top plate and the second top plate are detachably coupled to each other, wherein the first top plate and the second top plate include hooks and hook engagement holes, respectively, configured to be engaged with each other in a hooking manner; and a first bottom plate extending from a lower edge of the first side plate and a second bottom plate extending from a lower edge of the second side plate to face the first bottom plate, the first bottom plate and the second bottom plate forming a bottom surface of the internal space, wherein the first bottom plate and the second bottom plate are inclined downwardly at an angle with respect to a horizontal plane, respectively and end portion of the first bottom plate and an end portion of the second bottom plate are spaced apart from each other.