A battery module, comprising: a cell assembly comprising a lamination of a plurality of battery cells and one or more expansible members interspersed within the plurality of battery cells, the plurality of battery cells and the one or more expansible members being laminated in layers along a first direction; and a cell housing enclosing the cell assembly and forming an external appearance of the battery module, the cell housing comprising a first side that corresponds to a first end of the laminated layers of the cell assembly, and a second side that corresponds to a second end of the laminated layers of the cell assembly along the first direction, wherein the cell housing is configured to fix the first end and the second end of the cell assembly to inner surfaces of the first side and the second side of the cell housing, respectively, through pressure generated by a change in a thickness of the plurality of battery cells and the one or more expansible members along the first direction wherein the plurality of battery cells are longitudinally arranged along a second direction that is perpendicular to the first direction, and wherein the cell housing comprises: a first pressing plate and a second pressing plate covering the first end and the second end of the cell assembly, respectively; characterized by a first side plate and a second side plate covering a first side surface and a second side surface of the cell assembly respectively, and arranged perpendicular to a third direction that is perpendicular to both the first direction and the second direction, wherein the first and second side plates (122a, 122b) are locked by edge parts of the first and second pressing plates; and a front plate and a rear plate covering a first longitudinal end and a second longitudinal end of the cell assembly, respectively, and arranged in a direction that is perpendicular to the second direction, wherein the front and rear plates (123, 124) are locked by edge parts of the first and second pressing plates (121a, 121b) and by edge parts of the first and second side plates (122a, 122b). a cell assembly comprising a lamination of a plurality of battery cells and one or more expansible members interspersed within the plurality of battery cells, the plurality of battery cells and the one or more expansible members being laminated in layers along a first direction; and a cell housing enclosing the cell assembly and forming an external appearance of the battery module, the cell housing comprising a first side that corresponds to a first end of the laminated layers of the cell assembly, and a second side that corresponds to a second end of the laminated layers of the cell assembly along the first direction, wherein the cell housing is configured to fix the first end and the second end of the cell assembly to inner surfaces of the first side and the second side of the cell housing, respectively, through pressure generated by a change in a thickness of the plurality of battery cells and the one or more expansible members along the first direction wherein the plurality of battery cells are longitudinally arranged along a second direction that is perpendicular to the first direction, and wherein the cell housing comprises: a first pressing plate and a second pressing plate covering the first end and the second end of the cell assembly, respectively; characterized by a first side plate and a second side plate covering a first side surface and a second side surface of the cell assembly respectively, and arranged perpendicular to a third direction that is perpendicular to both the first direction and the second direction, wherein the first and second side plates (122a, 122b) are locked by edge parts of the first and second pressing plates; and a front plate and a rear plate covering a first longitudinal end and a second longitudinal end of the cell assembly, respectively, and arranged in a direction that is perpendicular to the second direction, wherein the front and rear plates (123, 124) are locked by edge parts of the first and second pressing plates (121a, 121b) and by edge parts of the first and second side plates (122a, 122b). a first pressing plate and a second pressing plate covering the first end and the second end of the cell assembly, respectively; characterized by a first side plate and a second side plate covering a first side surface and a second side surface of the cell assembly respectively, and arranged perpendicular to a third direction that is perpendicular to both the first direction and the second direction, wherein the first and second side plates (122a, 122b) are locked by edge parts of the first and second pressing plates; and a front plate and a rear plate covering a first longitudinal end and a second longitudinal end of the cell assembly, respectively, and arranged in a direction that is perpendicular to the second direction, wherein the front and rear plates (123, 124) are locked by edge parts of the first and second pressing plates (121a, 121b) and by edge parts of the first and second side plates (122a, 122b).