The present invention relates to an energy storage module capable of improving stability by reducing the risk of fire of a battery cell and minimizing the transition between battery cells in the event of a fire.
In one example, the present invention is a plurality of battery cells arranged along the longitudinal direction so that the long sides face each other, each including a vent; A plurality of insulating spacers interposed between long side surfaces of the plurality of battery cells; A cover member having an accommodation space therein and accommodating the plurality of battery cells and the plurality of insulating spacers; A duct coupled to an upper portion of the cover member and formed at a position corresponding to the vents of the plurality of battery cells, and an upper plate having an open hole at a position corresponding to the insulating spacer; An upper cover coupled to an upper portion of the upper plate and including a discharge hole at a position corresponding to the duct; And a fire extinguishing sheet located between the upper cover and the upper plate and performing a fire extinguishing agent at a predetermined temperature or higher, wherein the upper cover includes a protrusion on a lower surface, and the protrusion surrounds the exhaust area and It is coupled to the outside, the insulating spacer discloses an energy storage module in which a first sheet having heat insulating properties and a second sheet having flame retardancy or non-flammability are attached to both surfaces of the first sheet through an adhesive, respectively.