Packaged phase-change energy-storage composite material with super-high thermal conductivity and processing technology thereof

A technology of phase change energy storage and composite materials, which is applied in the field of organic waxy phase change composite materials and its processing technology, can solve the problems of low thermal conductivity and density of composite materials, expensive composite materials, leakage, etc., and achieve dense blank materials , good application prospects, the effect of low porosity

Active Publication Date: 2017-06-30
杭州诺麦科科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simple porous expanded graphite packaging technology works well, but in the actual process, the pores between the package particles are difficult to eliminate by simple pressing, so the thermal conductivity and density of the actual composite material are still low; Thermally conductive encapsulation technology of copper or porous copper foam, but since there is no chemisorption at the copper / paraffin interface, the composite is not only expensive, but also has the potential for leakage
Judging from the current information, it has not been seen to propose a packaged energy storage material with excellent comprehensive performance of energy storage density, thermal conductivity, leakage prevention, and cost performance, which can truly meet the needs of the general civilian market.

Method used

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  • Packaged phase-change energy-storage composite material with super-high thermal conductivity and processing technology thereof
  • Packaged phase-change energy-storage composite material with super-high thermal conductivity and processing technology thereof
  • Packaged phase-change energy-storage composite material with super-high thermal conductivity and processing technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: The phase-change energy storage composite material in this example uses n-hexacane as the main material for phase-change energy storage, and its melting temperature is 58°C; expanded graphite and nano-graphene sheets are used as thermal conductivity-enhanced packages; where The expansion temperature of the selected expanded graphite is 950°C, and the expansion rate is about 250 times. According to microscopic analysis, its average pore size is about 2 microns; the selected nano-graphene sheet is a powder material with an average thickness of about 8 nanometers. The ratio is selected as follows: in the overall composite material, the proportion of n-hexacane energy storage material is 90%; the rest is expanded graphite and nano-graphene sheets, wherein the proportion of expanded graphite is 8.5%, and the proportion of nano-graphene sheets is 1.5%.

[0032] The processing technology is as follows: firstly add n-hexacane and expanded graphite material in proporti...

Embodiment 2

[0033] Example 2: In this example, n-eicosane is selected as the main material for phase change energy storage as the phase change energy storage composite material, and its melting temperature is about 37°C; expanded graphite and nano-graphene sheets are also used as thermal conductivity enhanced packages The expansion temperature of the selected expanded graphite is 900°C, the expansion rate is about 300 times, and the average pore diameter is about 3.5 microns through microscopic analysis; the selected nano-graphene sheet is a powder material with an average thickness of about 10 nanometers. The ratio selection is as follows: in the overall composite material, the proportion of n-eicosane energy storage material is 87%; the rest is expanded graphite and nano-graphene sheets, wherein the proportion of expanded graphite is 11.7%, and the proportion of nano-graphene sheets is 1.3%.

[0034] The processing technology is as follows: first, add n-eicosane and expanded graphite mat...

Embodiment 3

[0035] Example 3: The phase-change energy storage composite material in this example uses n-hexacane as the main material for phase-change energy storage, and its melting temperature is 58°C; expandable graphite and nano-graphene sheets are used as thermal conductivity-enhanced packages The expansion temperature of the selected expanded graphite is 1000°C, and the expansion rate can reach nearly 500 times. According to microscopic analysis and statistics, its average pore size is about 10 microns; the selected nano-graphene sheet is a powder with an average thickness of about 6 nanometers. Material. The ratio is selected as follows: in the overall composite material, the proportion of n-hexacane energy storage material is 94%; the rest is expanded graphite and nano-graphene sheets, wherein the proportion of expanded graphite is 5%, and the proportion of nano-graphene sheets is 1%.

[0036]The processing technology is as follows: firstly add n-hexacane and expanded graphite mat...

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Abstract

The invention relates to a packaged phase-change energy-storage composite material with super-high thermal conductivity and a processing technology thereof and brings forward an expandable graphite/nanographene sheets combined thermal conductance enhanced packaged phase-change energy-storage composite material. The invention brings forward the structural optimal range of a packaging body, namely an expandable graphite material, used as a waxy phase-change material. The expansion rate reaches 200 times and above, and average pore size is 0.5-20 micrometers. Meanwhile, the range of ratio of the expandable graphite to nanographene sheets with high thermal conductivity is determined. The invention also brings forward a corresponding preparation technology of the composite material. Thermal diffusion coefficient of the phase-change energy-storage composite material reaches 2.9 mm<2>/s and above, and thermal conductivity reaches 6.9 W/mK and above. The thermal conductivity is nearly 30 times higher than thermal conductivity of a simple paraffin material, and energy storage density of the composite material is nearly 90% of energy storage density of the paraffin material. The phase-change energy-storage composite material has very high energy storage density and thermal conductivity, is green and environment-friendly, and has a very good application prospect.

Description

technical field [0001] The invention relates to an encapsulated phase-change energy storage material with high thermal conductivity and a processing technology thereof, in particular to an organic waxy phase-change composite material using expanded graphite and graphene sheet composite packaging technology and a processing technology thereof. Background technique [0002] Phase change energy storage materials can use the latent heat absorption and release of materials during the phase change process to achieve the purpose of adjusting the mismatch between energy demand and supply. The most commonly used materials for phase change energy storage include inorganic hydrated salt materials and organic waxy phase change materials. The heat absorption / release behavior accompanying the melting / solidification phase transition process of these materials is used to achieve the effect of thermal energy regulation. Among them, organic waxy phase change materials have the advantages of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 金明江应仁龙
Owner 杭州诺麦科科技有限公司
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