Phase change heat storage and/or cold storage device

The invention belongs to the technical field of heat storage and/or cold storage devices and particularly relates to a phase change heat storage and/or cold storage device. A heat exchange space is included, a phase change material and heat exchange fluid are arranged in the heat exchange space, the heat exchange space is filled with the heat exchange fluid, the phase change material can be completely soaked in the heat exchange fluid, the heat exchange space is filled with the heat exchange fluid, the phase change material can be completely soaked in the heat exchange fluid, the phase changematerial can make direct contact with the heat exchange fluid for heat transfer, and the heat resistance formed by a phase change material sealing layer in the prior art can be effectively avoided. The temperature difference needed by the heat exchange fluid and the phase change material heat transfer is effectively reduced, and the aim of reducing energy storage of the phase change heat storage and/or cold storage device