Graphite bipolar plate preparation method and graphite bipolar plate prepared by same

A bipolar plate and graphite plate technology, which is applied in the preparation of graphite bipolar plates and the field of graphite bipolar plates, can solve the problems affecting the gas permeability and mechanical properties of materials, the limitations of stack assembly and practical application, and the unsatisfactory resin impregnation effect, etc. problem, achieve the effect of enhancing gas permeability and mechanical strength, simple and reliable preparation method, and reducing the probability of microcracks and bubbles

Inactive Publication Date: 2021-02-02
BINZHOU DOUBLE PEAKS GRAPHITE SEALING MATERIAL
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the bipolar plate prepared by the method in the prior art is easy to form, the effect of resin impregnation is not ideal, which will affect the gas permeability and mechanical properties of the material, especially the tensile strength, and the thickness of the bipolar plate is also relatively large. There are certain restrictions on the assembly and practical application of the stack

Method used

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  • Graphite bipolar plate preparation method and graphite bipolar plate prepared by same

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Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 Shown, according to the graphite bipolar plate preparation method of the embodiment of the present invention, comprises the following steps:

[0034] S102, preparing expanded graphite: performing intercalation treatment on flake graphite, and instantaneously expanding at high temperature to obtain the low-density flexible expanded graphite, and the instantaneous expansion temperature is 900°C-1000°C.

[0035] S104, Pressed expanded graphite plate: Press low-density flexible expanded graphite into expanded graphite plate, that is, the thickness is 7mm, and the density is 0.2-1.0g / cm 3 flexible graphite sheet;

[0036] S106, preparing a polymer resin solution: mixing epoxy resin and phenolic resin in a ratio of 1:2, using ethanol as a solvent to prepare a solution with a viscosity of 20mPa·s and a resin mass fraction of 40%;

[0037] S108, resin vacuum mixing impregnation: pour the resin solution into the flexible graphite plate under the vacuum degree ...

Embodiment 2

[0043] The difference from Example 1 is that a resin solution with a mass fraction of 25% is selected. The final thickness is 0.7mm and the density is 1.9g / cm 3resin / flexible graphite composite bipolar plates.

[0044] After testing, the resin content in the bipolar plate is 23.31%, the electrical conductivity at 25°C is 552.14S / cm, the tensile strength is 13MPa, and the thermal conductivity is 56.13W / (m·k).

Embodiment 3

[0046] The difference from Example 1 is that a resin solution with a mass fraction of 45% is selected. The final thickness is 0.7mm and the density is 1.85g / cm 3 resin / flexible graphite composite bipolar plates.

[0047] After testing, the resin content in the bipolar plate is 32%, the electrical conductivity at 25°C is 228.52S / cm, the tensile strength is 37MPa, and the thermal conductivity is 118.25W / (m·k).

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Abstract

The invention provides a graphite bipolar plate preparation method and the graphite bipolar plate. The method comprises the following steps of firstly, carrying out intercalation treatment on crystalline flake graphite, carrying out instantaneous expansion at a high temperature to obtain expanded graphite, pre-pressing the expanded graphite into plates with different densities, and carrying out pressure or vacuum impregnation in a low-viscosity organic solvent containing resin, and heating and evaporating the plate subjected to surface treatment in an oven to remove the solvent, carrying out die pressing under a vacuum condition to form a flow field, and curing to form the bipolar plate. According to the technical scheme, the density of the prepared graphite bipolar plate is 1.0-2.0 g/cm<3>, the tensile strength of the bipolar plate subjected to impregnation treatment is 25-35 MPa, the mechanical property is improved along with the increase of the resin content, the gas sealing property is good, the preparation method is beneficial to reducing the thickness of the polar plate, and batch production is easy.

Description

technical field [0001] The invention relates to the technical field of bipolar plates for fuel cells, in particular to a method for preparing a graphite bipolar plate and a graphite bipolar plate. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a device that converts chemical energy into electrical energy and heat energy. It has the advantages of high energy conversion rate, rapid startup, environmental friendliness, quiet operation, and high reliability. Consists of a single battery. As a key component of the battery stack, the main functions of the bipolar plate are to separate the reaction gas, uniformly introduce the reaction gas, collect and conduct current, support the membrane electrode, and realize rapid drainage and heat dissipation of the fuel cell system. For this reason, the bipolar plate should have good electrical conductivity, thermal conductivity, corrosion resistance, gas barrier performance and certain mechanical strength. In a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0213H01M8/0258
CPCH01M8/0213H01M8/0258Y02E60/50Y02P70/50
Inventor 高志杰李海波牌君君高丽黄志强
Owner BINZHOU DOUBLE PEAKS GRAPHITE SEALING MATERIAL
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