Ultrathin phase change heat transfer element with gas-liquid separation, uniform distribution and coplanar characteristics

The ultrathin phase change heat transfer element comprises an upper shell plate and a lower shell plate, the lower shell plate is provided with a concave cavity, the peripheries of the lower shell plate and the upper shell plate are connected in a sealed mode to form a sealed cavity shell, and the inner surface of the lower shell plate comprises an evaporation area, a flowing area and a condensation area. The evaporation area and the condensation area are provided with columnar array structures and phase change liquid absorption cores. The flowing area is provided with long-strip-shaped supporting columns, liquid absorption cores and cavities at intervals. The upper surface of the liquid absorption core is tightly attached to the lower surface of the upper shell plate, the lower surface of the liquid absorption core is attached to the upper surface of the lower shell plate, the liquid absorption core is filled with a liquid working medium, the columnar array structure and the long-strip-shaped supporting colu