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High-density flexible graphite bipolar plate as well as preparation method and application thereof

A flexible graphite, bipolar plate technology, applied in the direction of final product manufacturing, climate sustainability, sustainable manufacturing/processing, etc., can solve problems such as unsatisfactory mechanical strength and air tightness, and achieve a simple resin pretreatment method and reduce The effect of internal resistance, improving work efficiency and service life

Pending Publication Date: 2022-05-31
广东环华氢能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the mechanical strength and airtightness of the fuel cell bipolar plates prepared by these existing processes are still not ideal.

Method used

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  • High-density flexible graphite bipolar plate as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of a high-density flexible graphite bipolar plate is carried out according to the following steps.

[0042] 1) Set the density to 0.06g / cm 3 The flexible expanded graphite sheet is evenly mixed with the ethanol solution of epoxy resin with a solid content of 5%, and pre-impregnated for 30 minutes under a vacuum of -0.9 bar or higher; after the pre-impregnation, the surface resin is washed with room temperature water .

[0043] 2) Semi-curing the cleaned flexible expanded graphite sheet at 20°C for 20 min to obtain a graphite sheet raw material with certain flexibility.

[0044] 3) The above-mentioned graphite plate raw material is molded in a mold with a gas flow channel and a cooling liquid flow channel to obtain a density of 0.10g / cm 3 , Prefabricated graphite bipolar plates with a thickness of 5mm.

[0045] 4) Immerse the epoxy resin ethanol solution with a solid content of 5% into the interior of the prefabricated graphite bipolar plate by va...

Embodiment 2

[0048] A preparation method of a high-density flexible graphite bipolar plate is carried out according to the following steps.

[0049] 1) Set the density to 0.04g / cm 3 The flexible expanded graphite sheet is mixed evenly with a phenolic resin solution with a solid content of 7%, and pre-impregnated for 20 minutes under a vacuum of -0.9 bar or higher; after the pre-impregnation, the surface resin is washed with room temperature water. In this step, the solvent used in the phenolic resin solution is 50% methanol and 50% ethanol, calculated by volume.

[0050] 2) Semi-curing the cleaned flexible expanded graphite sheet at 15°C for 30 minutes to obtain a graphite sheet raw material with certain flexibility.

[0051] 3) The above-mentioned graphite plate raw material is molded in a mold with a gas flow channel and a cooling liquid flow channel to obtain a density of 0.08g / cm 3 , Prefabricated graphite bipolar plates with a thickness of 6mm.

[0052] 4) Immerse the phenolic resi...

Embodiment 3

[0055] A preparation method of a high-density flexible graphite bipolar plate is carried out according to the following steps.

[0056] 1) Set the density to 0.10g / cm 3 The flexible expanded graphite sheet is mixed evenly with a polyacrylic resin solution with a solid content of 8%, and pre-impregnated for 10 minutes under a vacuum of -0.9 bar or higher; after the pre-impregnation, the surface resin is washed with room temperature water. In this step, the solvent used in the polyacrylic acid resin solution is 30% methanol, 30% ethanol, 20% isopropanol, and 20% glycerol, calculated by volume.

[0057] 2) Semi-curing the cleaned flexible expanded graphite sheet at 25°C for 16 minutes to obtain a graphite sheet raw material with certain flexibility.

[0058] 3) The above-mentioned graphite plate raw material is molded in a mold with a gas flow channel and a cooling liquid flow channel to obtain a density of 0.15g / cm 3 , Prefabricated graphite bipolar plates with a thickness of ...

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Abstract

The invention discloses a high-density flexible graphite bipolar plate as well as a preparation method and application thereof, flexible expanded graphite is subjected to mixing pretreatment by using a low-viscosity dilute resin solution, and resin is uniformly distributed in the flexible graphite bipolar plate in combination with a resin infiltration post-treatment procedure after compression molding, so that the density of the flexible graphite bipolar plate is improved; the internal porosity of the bipolar plate is effectively reduced, the strength and air tightness of the bipolar plate are improved, the high-density flexible graphite bipolar plate is finally obtained, the working efficiency of a fuel cell is improved, and the service life of the fuel cell is prolonged. The flexible graphite bipolar plate based on the low-viscosity diluted resin solution pretreatment method is simple in preparation process and low in cost, is particularly suitable for rapid batch treatment, and is suitable for popularization and application in the field of flexible graphite bipolar plates of fuel cells.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a high-density flexible graphite bipolar plate and a preparation method and application thereof. Background technique [0002] Hydrogen is the most widely distributed element in the universe. Due to its physical and chemical properties, hydrogen has become a widely concerned secondary clean energy. It has many advantages such as high energy density, wide range of sources, and green environmental protection. of clean zero-carbon energy. Hydrogen fuel cells using hydrogen as fuel have the characteristics of high energy conversion efficiency, environmental friendliness, and rapid start-up at room temperature. At the same time, through the cogeneration system, the energy utilization efficiency can be further improved, which is regarded as one of the main paths for the transformation of the energy system to sustainable development, and has great potential for wide application. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B15/10B29B15/12B29C70/46H01M8/0213H01M8/0221H01M8/0226
CPCB29B15/10B29B15/125B29C70/46H01M8/0213H01M8/0221H01M8/0226Y02P70/50
Inventor 张锐明邓亮余孟杰孟子寒汤海波龚聪文
Owner 广东环华氢能科技有限公司
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