Energy storage device

The embodiment of the utility model provides an energy storage device, which comprises a cabinet body, a heat dissipation device and an energy storage piece, an installation space is arranged in the cabinet body, the outer surface of the cabinet body is provided with an air inlet and an air outlet, the air inlet is positioned on one side of the cabinet body along a first direction, the air outlet is positioned on one side of the cabinet body along a second direction, and the first direction is intersected with the second direction; the heat dissipation device is arranged in the installation space, the heat dissipation device can enable air flow to flow from the air inlet to the air outlet, the heat dissipation device is arranged above the energy storage part, and in a projection plane perpendicular to the vertical direction, at least part of projection of the heat dissipation device in the vertical direction is located in the projection range of the energy storage part in the vertical direction. According to the energy storage device provided by the embodiment of the utility model, the air inlet and the air outlet are arranged at different sides of the cabinet body, so that normal-temperature air enters the air inlet and then exchanges heat with heat dissipation equipment, the occupied area of the cabinet body is reduced, and the placement stability of the energy storage device is improved.