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Preparation method of cold-pressed composite bipolar plate

A bipolar plate and cold-pressing technology, which is applied in the preparation of cold-pressed composite bipolar plates and the cold-pressed preparation process of composite bipolar plates for proton exchange membrane fuel cells, can solve the problems of low production efficiency, high production energy consumption, It is difficult to realize fully automated production and other issues, so as to achieve the effects of low production cost, low production energy consumption and improved raw material utilization

Active Publication Date: 2021-08-17
SICHUAN DONGFANG INSULATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hot-pressed composite bipolar plate is formed by putting the pre-prepared hot-pressed bipolar plate mass into a special mold, and forming it under high temperature and high pressure with a temperature above 140°C and a pressure above 20MPa to obtain a bipolar plate with flow channels. board, its curing time ranges from a few minutes to tens of minutes, and has the disadvantages of high production energy consumption, low production efficiency, and difficulty in fully automated production.

Method used

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  • Preparation method of cold-pressed composite bipolar plate

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Effect test

Embodiment 1

[0033] A method for preparing a cold-pressed composite bipolar plate, the preparation steps are as follows:

[0034] a, ingredients: 65 parts by weight of natural flake graphite, 10 parts by weight of artificial graphite (the particle size of artificial graphite is preferably less than 100 microns, the same hereinafter), 6 parts by weight of conductive additive, 10 parts by weight of bonding resin composition, 9 parts by weight of toughening resin, 70 parts by weight of solvent acetone, get the raw materials of each component, and set aside;

[0035] The bonding resin composition is composed of 75% novolak epoxy resin, 24.6% curing agent and 0.4% accelerator by weight percentage;

[0036] The conduction aid is a mixture of 5 parts by weight of conductive carbon black and 1 part by weight of carbon nanotubes;

[0037] The curing agent is diaminodiphenyl sulfone; the accelerator is 2-ethyl-4 methylimidazole;

[0038] The toughened resin is polyvinyl butyral resin (PVB for shor...

Embodiment 2

[0047] A method for preparing a cold-pressed composite bipolar plate, the preparation steps are as follows:

[0048] a, ingredients: 65 parts by weight of natural flake graphite, 12 parts by weight of artificial graphite, 8 parts by weight of conductive additive, 9 parts by weight of bonding resin composition, 6 parts by weight of toughening resin, and 80 parts by weight of solvent methyl ethyl ketone, each Component raw materials, spare;

[0049] The bonding resin composition is composed of 75% novolac epoxy resin, 24.6% curing agent and 0.4% accelerator by weight percentage;

[0050] Described novolac epoxy resin is novolac 638S epoxy resin;

[0051] Described conduction aid is the mixture of 7 weight parts of conductive carbon black and 1 weight part of graphene;

[0052] The curing agent is diaminodiphenyl sulfone; the accelerator is 2-ethyl-4 methylimidazole;

[0053] The toughened resin is polyvinyl butyral resin (PVB for short);

[0054] b. Prepare wet powder by mix...

Embodiment 3

[0062] A method for preparing a cold-pressed composite bipolar plate, the preparation steps are as follows:

[0063] a, ingredients: 70 parts by weight of natural flake graphite, 10 parts by weight of expanded graphite, 7 parts by weight of conductive additive, 8 parts by weight of bonding resin composition, 6 parts by weight of toughening resin, and 100 parts by weight of solvent acetone, take each group Divide the raw materials and reserve;

[0064] The bonding resin composition is composed of 92% novolac epoxy resin, 7.6% curing agent and 0.4% accelerator by weight percentage;

[0065] The conduction aid is a mixture of 5 parts by weight of conductive carbon black, 1 part by weight of carbon nanotubes and 1 part by weight of graphene;

[0066] The curing agent is dicyandiamide; the accelerator is imidazole;

[0067] The toughened resin is polyvinyl butyral resin (PVB for short);

[0068] b. Prepare wet powder by mixing and dispersing raw materials: Add novolac epoxy resi...

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Abstract

The invention discloses a preparation method of a cold-pressed composite bipolar plate, and the method is characterized in that the method comprises the steps: taking raw materials of natural crystalline flake graphite, artificial graphite or / and expanded graphite, a conductive additive, a bonding resin composition, toughening resin and a solvent, wherein the bonding resin composition is formed by mixing novolac epoxy resin, a curing agent and an accelerant, and the toughening resin is polyvinyl butyral resin; dispersing, kneading, internally mixing and drying the raw materials to prepare powder, molding the powder by a mold at normal temperature and high pressure and then performing curing to prepare the cold-pressed composite bipolar plate. The cold-pressed composite bipolar plate prepared by the invention has the characteristics of low gas permeability, small thickness, high strength, excellent corrosion resistance, low resistivity, low production energy consumption, high efficiency and the like, and is suitable for being used as a bipolar plate of a proton exchange membrane fuel cell.

Description

technical field [0001] The invention belongs to a device for converting chemical energy into electric energy, and relates to a preparation method of a cold-pressed composite bipolar plate, in particular to a cold-pressed preparation process of a composite bipolar plate for a proton exchange membrane fuel cell. The cold-pressed composite bipolar plate prepared by the invention is suitable for the bipolar plate of the proton exchange membrane fuel cell (that is, the middle pole piece assembled by the battery). Background technique [0002] Among many fuel cells, the proton exchange membrane fuel cell (PEMFC for short) has been commercialized on a large scale. The proton exchange membrane fuel cell has the advantages of high efficiency, high specific power, wide operating temperature range, and fast start-up. It is used in passenger vehicles, freight vehicles, etc. Vehicles, aerospace and other fields have been widely used. In the PEMFC, the bipolar plate plays the role of con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0213H01M8/0226B29C43/02B29K63/00B29K507/04
CPCH01M8/0213H01M8/0226B29C43/003B29C43/02B29K2507/04B29K2063/00Y02E60/50
Inventor 李先德王鸿飞李冬梅杨敏师强
Owner SICHUAN DONGFANG INSULATING MATERIAL
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