An energy storage apparatus, comprising a cabinet, cyclic cooling units, a support, battery modules, and an air supply duct, wherein the support is fastened in an inner cavity of the cabinet, the battery modules are fastened on the support, the support and the battery modules jointly separate the inner cavity into an air intake region and an air return region, a heat dissipation duct is disposed in the battery module, and the heat dissipation duct communicates with the air intake region and the air return region; the cyclic cooling unit is located outside the cabinet and is nearer the air return region than the air intake region, the cyclic cooling unit comprises an air inlet vent and an air return vent, one end of the air supply duct communicates with the air inlet vent, and the other end of the air supply duct communicates with the air intake region, and the air return vent communicates with the air return region; and the cyclic cooling unit is configured to supply cooling gas from the air inlet vent, wherein the cooling gas successively passes through the air supply duct, the air intake region, the heat dissipation duct, and the air return region, and finally flows back to the cyclic cooling unit from the air return vent, wherein the cyclic cooling unit and the air intake region are disposed on two opposite sides of the air return region, and the air supply duct is disposed across a top of the support and communicates with the air inlet vent and the air intake region, wherein there are at least two cyclic cooling units, and the at least two cyclic cooling units are disposed side by side in a first direction; and the air supply duct comprises at least two sub-ducts, the at least two sub-ducts are also disposed side by side in the first direction, and each sub-duct correspondingly communicates with an air inlet vent of one cyclic cooling unit, and wherein a mixed-flow fan is disposed between two adjacent sub-ducts, and is bidirectionally rotatable; and the mixed-flow fan is configured to supply cooling gas in one sub-duct to the other sub-duct, to balance temperatures of the two adjacent sub-ducts. the support is fastened in an inner cavity of the cabinet, the battery modules are fastened on the support, the support and the battery modules jointly separate the inner cavity into an air intake region and an air return region, a heat dissipation duct is disposed in the battery module, and the heat dissipation duct communicates with the air intake region and the air return region; the cyclic cooling unit is located outside the cabinet and is nearer the air return region than the air intake region, the cyclic cooling unit comprises an air inlet vent and an air return vent, one end of the air supply duct communicates with the air inlet vent, and the other end of the air supply duct communicates with the air intake region, and the air return vent communicates with the air return region; and the cyclic cooling unit is configured to supply cooling gas from the air inlet vent, wherein the cooling gas successively passes through the air supply duct, the air intake region, the heat dissipation duct, and the air return region, and finally flows back to the cyclic cooling unit from the air return vent, wherein the cyclic cooling unit and the air intake region are disposed on two opposite sides of the air return region, and the air supply duct is disposed across a top of the support and communicates with the air inlet vent and the air intake region, wherein there are at least two cyclic cooling units, and the at least two cyclic cooling units are disposed side by side in a first direction; and the air supply duct comprises at least two sub-ducts, the at least two sub-ducts are also disposed side by side in the first direction, and each sub-duct correspondingly communicates with an air inlet vent of one cyclic cooling unit, and wherein a mixed-flow fan is disposed between two adjacent sub-ducts, and is bidirectionally rotatable; and the mixed-flow fan is configured to supply cooling gas in one sub-duct to the other sub-duct, to balance temperatures of the two adjacent sub-ducts.