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Process for preparing fuel cell bipolar plate and composite material used thereof

A composite material, fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low electrical conductivity and strength, and achieve the effect of improving performance indicators and simple preparation process

Inactive Publication Date: 2004-12-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The bipolar plate made of single flexible graphite has good electrical and thermal conductivity, but it is difficult to improve its strength through technological means to meet the requirements of use; adding metal foil to the large-size thin bipolar plate strengthens it. In the case of a small thickness, how to make flexible graphite evenly cover the entire surface of the metal foil is a technical difficulty
[0007] Resin-based carbon composite bipolar plates are the development direction of proton exchange membrane fuel cell bipolar plates. The current resin-based carbon composite proton exchange membrane fuel cell bipolar plates only use a single natural graphite or artificial graphite component As a conductive aggregate, its conductivity and strength are low

Method used

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preparation example Construction

[0027] Preparation of bipolar plate: The composite material provided by the present invention can be used to manufacture bipolar plates basically by any method for manufacturing resin-based proton exchange membrane fuel cells. The invention provides a method for preparing bipolar plates by molding method, the method includes two kinds of inner stripping and outer stripping. 180°C; the molding pressure is 6MPa-25MPa, the preferred pressure range is 10MPa-20MPa; the curing time is 10-30min.

[0028] (a) Use internal release film: mix natural flake graphite / artificial graphite in a kneading pot at a ratio of 0.8 to 1.50, add 13% to 25% of adhesive, and then add curing agent. The amount of curing agent added is The resin content in the adhesive is 1% to 3%. If an internal release agent is used, an internal release agent can be added at this time. The release agent is MOLD WIN INT-PUL24, and the amount added is 0.5% of the resin content in the adhesive. ~2%, stirred at 20-25°C (ro...

Embodiment 1

[0031] Material Weight %

[0032] Artificial graphite (-250 mesh, conductive aggregate) 41.7

[0033] Natural graphite (-150 mesh, conductive aggregate) 33.3

[0034] Unsaturated P17-902 polyester resin (adhesive) 25

[0035] Curing agent 2 (accounting for resin content)

[0036] Internal release agent 2 (accounting for resin content)

[0037] Molding pressure: 6MPa

[0038] Molding temperature: 150℃

[0039] Curing time: 30 minutes

[0040] The performance is as follows:

[0041] Density: 1.84g / cm3 Conductivity: 120S / cm Flexural strength: 41MPa

Embodiment 2

[0043] Material Weight %

[0044] Artificial graphite (-250 mesh, conductive aggregate) 32

[0045] Natural graphite (-150 mesh, conductive aggregate) 48

[0046] carbon black 2

[0047] Unsaturated P17-902 polyester resin (adhesive) 20

[0048] Curing agent 2 (accounting for resin content)

[0049] Internal release agent 1 (accounting for resin content)

[0050] Molding pressure: 20MPa

[0051] Molding temperature: 200℃

[0052] Curing time: 10 minutes

[0053] The performance of the bipolar plate is as follows:

[0054] Density: 1.88g / cm 3 Conductivity: 195S / cm Flexural strength: 32MPa

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Abstract

This invention relates to a preparation technology of fuel cell bipolar plate and its material. The composite material contains a conduction backbone material of 75%-87% in weight ratio, 13%-25% binder and hardener, the said conduction backbone material uses a material mixed in certain proportion by a natural scaled graphite and delanium graphite, a phenolic modified vinyl resin or unsaturated P17-902 polyester resin are taken as the binder and methyl ethyl ketone peroxide and the benzoperoxide as the hardener added by small amount of auxiliary component black carbon or natural graphite powders. The bipolar plate is formed by die pressing at one run under a certain formation temperature and pressure and its conductivity, anti-flex intensity and air penetration are higher than those of single graphite.

Description

technical field [0001] The invention relates to a composite material for manufacturing a proton exchange membrane fuel cell (PEMFC) bipolar plate and a preparation process thereof, belonging to the technical field of proton exchange membrane fuel cells. Background technique [0002] A fuel cell (FC) is a device that directly converts chemical energy stored in fuel and oxidant into electrical energy through electrode reactions. Its biggest feature is that since the reaction process does not involve fossil fuels, its energy conversion efficiency is not limited by the "Carnot cycle", and its energy conversion efficiency is high. Raymond George pointed out in the article "Fuel Cells and Its Development Prospects" that the energy conversion rate of proton exchange membrane fuel cells is as high as 60% to 80%, and the actual efficiency is twice that of ordinary internal combustion engines [see International Power, 2001 (2) : 24-26]. In addition, it also has the advantages of div...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 邹彦文张杰贺俊唐亚平郑永平邱学良
Owner TSINGHUA UNIV
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