Energy storage module

An energy storage module comprising:

• a plurality of battery cells arranged in a length direction such that long side surfaces of adjacent battery cells of the battery cells face one another;
• a plurality of insulation spacers, at least one of the insulation spacers being between the long side surfaces of each adjacent pair of the battery cells;
• a cover member comprising an internal receiving space configured to accommodate the battery cells and the insulation spacers;
• a top plate coupled to a top of the cover member, the top plate comprising ducts respectively corresponding to vents of the battery cells and having opening holes respectively corresponding to the insulation spacers;
• a top cover coupled to a top of the top plate and having discharge holes respectively corresponding to the ducts;
• and
• an extinguisher sheet between the top cover and the top plate, the extinguisher sheet being configured to emit a fire extinguishing agent at a temperature exceeding a reference temperature,
• wherein the top cover comprises protrusion parts on a bottom surface thereof, the protrusion parts covering an exhaust region and being coupled to an exterior of each of the ducts, and each of the insulation spacers comprises a flame-retardant or non-combustible first sheet and heat-insulating second sheets respectively adhered to opposite surfaces of the first sheet by an adhesion member.