An energy storage device is provided. In one embodiment, the energy storage device includes an energy storage chamber containing an electrolyte, a flexible package packaging the energy storage chamber, a set of electrodes contacting with the electrolyte and extending from the interior of the energy storage chamber to the exterior of the flexible package for electrical connection, a first pipe extending from the interior of the energy storage chamber to the exterior of the flexible package, and a second pipe extending from the interior of the energy storage chamber to the exterior of the flexible package, and the electrolyte is conducted to the interior of the energy storage chamber through the first pipe, and the electrolyte and gas produced inside the energy storage chamber are exhausted through the second pipe. A system and a fabricating method are also provided.
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