An energy storage apparatus, comprising: a chamber comprising a first sidewall ; a second sidewall positioned perpendicularly to the first sidewall ; a third sidewall facing the first sidewall and positioned perpendicularly to the second sidewall ; and a fourth sidewall facing the second sidewall 120) and positioned perpendicularly to the first sidewall and the third sidewall ; and a receiving space therein; battery racks comprising a first battery rack group and a second battery rack group positioned in the receiving space and spaced apart from each other while facing each other with reference to a center of the receiving space , and wherein the battery racks of the first battery rack group are spaced apart from the second sidewall by a certain distance and disposed in parallel along a first direction, the battery racks of the second battery rack group are spaced apart from the fourth sidewall by a certain distance and disposed in parallel along the first direction; an upper duct positioned above the receiving space configured to supply cooling fluid to a cooling space which is a space between the first battery rack group and the second battery rack group ; a cooling unit positioned outside the receiving space and configured to cool the cooling fluid; and a fluid moving member comprising a moving space where the cooling fluid heated after passing through the battery racks from the cooling space moves to the cooling unit , wherein the cooling unit is configured to be supplied with the heated cooling fluid from the moving space , cool the supplied cooling fluid, and then supply a resultant fluid to the upper duct . a chamber comprising a first sidewall ; a second sidewall positioned perpendicularly to the first sidewall ; a third sidewall facing the first sidewall and positioned perpendicularly to the second sidewall ; and a fourth sidewall facing the second sidewall 120) and positioned perpendicularly to the first sidewall and the third sidewall ; and a receiving space therein; battery racks comprising a first battery rack group and a second battery rack group positioned in the receiving space and spaced apart from each other while facing each other with reference to a center of the receiving space , and wherein the battery racks of the first battery rack group are spaced apart from the second sidewall by a certain distance and disposed in parallel along a first direction, the battery racks of the second battery rack group are spaced apart from the fourth sidewall by a certain distance and disposed in parallel along the first direction; an upper duct positioned above the receiving space configured to supply cooling fluid to a cooling space which is a space between the first battery rack group and the second battery rack group ; a cooling unit positioned outside the receiving space and configured to cool the cooling fluid; and a fluid moving member comprising a moving space where the cooling fluid heated after passing through the battery racks from the cooling space moves to the cooling unit , wherein the cooling unit is configured to be supplied with the heated cooling fluid from the moving space , cool the supplied cooling fluid, and then supply a resultant fluid to the upper duct . <EOS>