Abstract: A battery module includes battery cells arranged along a longitudinal direction of the battery module with respective long side surfaces of adjacent ones of the battery cells facing each other and heat-insulating partition walls interposed between the respective long side surfaces of the adjacent ones of the battery cells. A heat-insulating partition wall of the heat-insulating partition walls includes a heat-insulating sheet and a frame around an edge of the heat-insulating sheet. The heat-insulating sheet has a plate shape and comprises pores therein. The heat-insulating sheet is coupled between the respective long side surfaces of the adjacent ones of the battery cells.