Form-stable phase change material with multilevel package structure and preparation method thereof

Abstract

The invention discloses a form-stable phase change material with a multilevel package structure. The form-stable phase change material is prepared from ingredients by mass percent: 38 to 70% of phasechange material, 5 to 20% of first-stage package porous graphite, 20 to 50% of second-stage package thermoplastic polymer. According to the form-stable phase change material, the phase change material, the porous graphite and the thermoplastic polymer are utilized as materials, the porous graphite is utilized to perform first-stage package on the phase change material, the thermoplastic polymer isutilized to perform second-stage package on the phase change material in a melting and blending process, and the form-stable phase change material can be prepared by twice package. The form-stable phase change material disclosed by the invention has the advantages of good heat conductivity coefficient, phase change latent heat and mechanical property.

Description

technical field [0001] The invention belongs to the technical field of phase change materials, and in particular relates to a shape-setting phase change material with a multi-level encapsulation structure and a preparation method thereof. Background technique [0002] New energy vehicles, represented by pure electric vehicles, gradually get rid of their dependence on fossil fuels and become the mainstream direction of automobile development. Electric vehicles are powered by power batteries. Lithium-ion power batteries have the advantages of high energy density, high power density, high operating voltage, and service life, and have occupied the main market of power batteries. Lithium-ion batteries can only ensure their good charge-discharge efficiency, reliability and lifespan when they work at a suitable temperature. Therefore, a reasonable and effective thermal management system is required to ensure that the power battery is at a suitable working temperature. At present...

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Problems solved by technology

[0006] (2) Shape-setting phase-change materials with polymers as the matrix or skeleton. The polymer itself does not have the functionality of adsorption and shape-setting of phase-change materials, and phase separation is prone to occur during thermal cycling after compounding;

[0007] (3) Since the thermal conductivity enhancing material is directly compounded with the polymer matrix in the form of filler, its thermal conductivity is generally not high, resulting in a lower heat absorption and release rate and lower heat storage efficiency;

[0008] (4) At present, the research on shape-setting phase change materials mainly focuses on the latent heat of phase change and thermal conductivity, and there are few studies on mechanical properties.

However, there are few studies on the mechanical properties of shape-fixed phase change materials for power battery thermal management.

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