Phase-change composite granular material, preparation method and application thereof and battery heat sink

A technology of phase-change composite materials and heat dissipation devices, which is applied in the field of phase-change composite material pellets and its preparation, and battery heat dissipation devices. It can solve problems such as damage, short circuit, and high porosity of electronic devices, and achieve the effect of prolonging service life.

Pending Publication Date: 2019-08-02
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foamed carbon has high thermal conductivity, low density, and high porosity. It can be used in heat storage and heat dissipation when combined with phase change materials. However, carbon materials have good electrical conductivity. When foamed carbon is used for heat dissipation in electronic devices or batteries , easily lead to short circuit, resulting in damage to electronic devices

Method used

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  • Phase-change composite granular material, preparation method and application thereof and battery heat sink
  • Phase-change composite granular material, preparation method and application thereof and battery heat sink
  • Phase-change composite granular material, preparation method and application thereof and battery heat sink

Examples

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preparation example Construction

[0024] According to the first aspect of the present invention, the present invention provides a kind of preparation method of phase change composite material pellet, and this method comprises:

[0025] 1) impregnating the porous media matrix with liquid-solid phase change materials to obtain porous composite materials;

[0026] 2) granulating the porous composite material to obtain porous composite material pellets;

[0027] 3) Coating the porous composite pellets with an insulating resin to form an insulating layer on the surface of the pellets.

[0028] In the present invention, the porous medium matrix enables the liquid-solid phase change material to maintain a solid shape in appearance when the phase change occurs, and it can be a carrier commonly used in the preparation of shape-stable phase change materials (FSPCM), from the type of material The upper part can be selected from porous inorganic matrix, porous organic matrix and porous metal matrix. For the present inve...

Embodiment approach

[0031] In the present invention, the porous carbon material can be prepared by self-foaming or foaming in the presence of a foaming agent using pitch or a mixture of pitch and graphite as a raw material, followed by carbonization and graphitization in sequence. According to a specific embodiment, the porous carbon material is prepared by the following method:

[0032] a) Add pitch to the autoclave, raise the temperature to 200-500°C under the pressure of 0-10MPa, preferably 3-8MPa, keep the pressure at constant temperature for 0.1-5h, and then cool;

[0033] b) Put the product obtained in step 1) into a carbonization furnace, raise the temperature to 500-1600°C, keep the temperature constant for 0.1-2h, and then cool to obtain a carbonized product;

[0034] c) Put the carbonized product into a graphitization furnace, raise the temperature to 2000-2800°C, keep the temperature constant for 0.1-1h, and then cool to obtain porous carbon.

[0035] In steps a)-c), the cooling tempe...

preparation example

[0068] This preparation example is used to illustrate the preparation methods of the porous carbons of the examples and comparative examples.

[0069] Put the mesophase pitch (the softening point is 300°C, the residual carbon rate is 85wt%) into the autoclave, and under the pressure of 5MPa, the temperature is raised to 500°C at a heating rate of 5°C / min, and the pressure is maintained for 30min, and then the temperature is lowered to room temperature. The obtained product was put into a carbonization furnace at a heating rate of 5°C / h to 1200°C, kept at a constant temperature for 0.5 hours, and then cooled to below 40°C to obtain a carbonized product. Put the carbonized product into a graphitization furnace at a heating rate of 300°C / h to 2500°C, and keep the temperature constant for 0.5h. After the constant temperature is completed, it is naturally cooled to below 50°C and then released from the furnace to obtain porous carbon. The density of the porous carbon is 0.5g / cm 3...

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Abstract

The invention relates to the field of phase-change energy storage materials and discloses a phase-change composite granular material, a preparation method and an application thereof and a battery heatsink. The method comprises steps as follows: 1), a porous medium substrate is impregnated by a liquid-solid phase-change material, and a porous composite is obtained; 2), the porous composite is granulated, and the phase-change composite granular material is obtained; 3), the phase-change composite granular material is coated with insulating resin, and an insulating layer is formed on the surfaceof the granular material. According to the phase-change composite granular material, the outer surfaces of the granules are coated with the insulating resin, the heat sink processed by the granules and a resin binder has both heat dissipation property and insulating performance, and insulating and phase change properties can still by kept even though the material is damaged.

Description

technical field [0001] The invention relates to the field of phase-change energy storage materials, in particular to a phase-change composite material pellet, a preparation method and application thereof, and a battery cooling device. Background technique [0002] Phase change materials (PCM) mainly use their properties of absorbing and releasing a large amount of latent heat of phase change during melting and solidification and the process is approximately isothermal for thermal control, which is very suitable for electronic components or equipment that work periodically / intermittently. Due to the large latent heat of phase change of PCM, it is very effective to use PCM phase change heat storage materials for thermal control of electronic components with small volume and high power density. [0003] For a phase change heat storage device, when the phase change material is selected, the most prominent problem is that the thermal conductivity of most phase change materials is...

Claims

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Application Information

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IPC IPC(8): C09K5/06H01M10/659H01M10/613
CPCC09K5/063H01M10/613H01M10/659Y02E60/10
Inventor 刘均庆梁文斌徐文强段春婷郑冬芳梁朋王秋实
Owner CHNA ENERGY INVESTMENT CORP LTD
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