▎ 摘　　要

NOVELTY - Composite phase change material, comprises a phase change material and a heat conducting powder, where the particles of the heat conducting powder has a porous structure. USE - Used as composite phase change material. ADVANTAGE - The material can be separated due to the difference in density; and results in a decrease in the thermal conductivity of the composite phase change material. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: container assembly, comprising a first shell, where the first shell is provided with a first chamber, a second shell, connected with the first shell, a second chamber is formed between the first shell and the second shell, the second chamber is surrounded on the outer side of the first chamber and the composite phase change material, the composite phase change material is located in the second chamber, where the composite phase change material is configured to be capable of exchanging heat with the first chamber; and preparing composite phase change material, comprises heating the phase change material to melting; adding thermally conductive powder into the melted phase change material to obtain a mixed material, solidifying the mixed material to obtain a composite phase change material, where, the particles of the thermally conductive powder have porous structure.