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

A technology of shape-setting phase-change materials and encapsulation structures, applied in heat exchange materials, chemical instruments and methods, secondary batteries, etc., can solve problems such as reduced heat storage efficiency, low heat absorption and release rate, and low thermal conductivity. Improve stability and enhance heat transfer effect

Inactive Publication Date: 2018-05-18
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Molded expanded graphite with an expansion ratio of 300ml / g into a porosity of 93.36% and a density of 0.15g / cm 3 , Porous graphite with a pore size of 10 nm to 100 μm.

[0034] 2. After the paraffin with a phase transition temperature of 51.4 °C and an enthalpy value of 245 J / g melted into a liquid phase at 60 °C, the porous graphite was completely immersed; after infiltrating at -0.09MPa for 1h and then at 0.6MPa for 1.5h It was taken out and cooled to obtain a porous graphite / phase change composite material containing 15 wt % of porous graphite.

[0035] 3. Crushing the porous graphite / phase change composite material obtained in step 2 into fine particles of 150 meshes.

[0036] 4. Weigh the fine particles obtained in step 3 and polyethylene (PE) with a melting point of 150° C. in a weight ratio of 80:20 for preparation.

[0037] 5. Polyethylene (PE) was heated at 160° C. into a melt, the fine particles obtained in step 3 were added, melt-blended for 30 minutes ...

Embodiment 2

[0039] 1. Molded expanded graphite with an expansion ratio of 200ml / g into a porosity of 94.69% and a density of 0.12g / cm 3 , Porous graphite with a pore size of 10 nm to 110 μm.

[0040] 2. After the paraffin with a phase transition temperature of 51.4 °C and an enthalpy value of 245 J / g is melted into a liquid phase at 60 °C, the porous graphite is completely immersed, and then infiltrated at -0.09MPa for 1h and then at 0.6MPa for 1h and then taken out. After cooling, a porous graphite / phase change composite material containing 12 wt % of porous graphite was obtained.

[0041] 3. Crushing the porous graphite / phase change composite material obtained in step 2 into 100 mesh fine particles.

[0042] 4. Weigh the fine particles obtained in step 3 and polypropylene (PP) with a melting point of 160° C. in a weight ratio of 55:45 for preparation.

[0043] 5. Heat the polypropylene to melt at 165°C, add the composite fine particles to blend for 60 minutes, put them in the mold, and ...

Embodiment 3

[0045] 1. Molded expanded graphite with an expansion ratio of 350ml / g into a porosity of 95.57% and a density of 0.10g / cm 3 , Porous graphite with a pore size of 10 nm to 100 μm.

[0046] 2. After the paraffin with a phase transition temperature of 39 °C and an enthalpy value of 225 J / g is melted into a liquid phase at 60 °C, the porous graphite is completely immersed, infiltrated at -0.09MPa for 1h, and then at 0.6MPa for 45min. After cooling, a porous graphite / phase change composite material containing 10 wt % of porous graphite was obtained.

[0047] 3. Crushing the porous graphite / phase change composite material obtained in step 2 into 120 mesh fine particles.

[0048] 4. Weigh the fine particles obtained in step 3 and polypropylene (PP) with a melting point of 160° C. in a weight ratio of 65:35 for preparation.

[0049] 5. The polypropylene was heated to melt at 168°C, the composite fine particles were added to blend for 45 minutes and then placed in the mold, and the p...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06H01M10/613H01M10/625H01M10/659
CPCC09K5/066H01M10/613H01M10/625H01M10/659Y02E60/10
Inventor 陶则超郭全贵王宏宝李香粉刘占军
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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