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Manufacturing technique of bipolar plate for fuel battery

A manufacturing process and fuel cell technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of fragile, time-consuming, difficult to achieve mixing effects, etc., to achieve the effect of improving performance and reducing processing costs

Active Publication Date: 2013-05-22
KUSN FUERSAI ENERGY
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  • Abstract
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Problems solved by technology

However, since the density of worm-like expanded graphite is only a few hundredth of that of natural graphite, and it is extremely fragile, it is difficult to achieve a good mixing effect and takes a long time if the expanded graphite and resin are simply ground and mixed. ,

Method used

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  • Manufacturing technique of bipolar plate for fuel battery

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Embodiment Construction

[0037] The present invention will be further described below according to accompanying drawing and specific embodiment:

[0038] 1) Dry-mix the resin powder (70-90wt%) that meets the particle size requirements after grinding and sieving with carbon black / carbon fiber (10-30wt%), and make sure to mix evenly;

[0039] 2) Afterwards, mix the carbon black / carbon fiber resin (30-50wt%) uniformly in an appropriate proportion with the existing expanded graphite (50-70wt%) in proportion; use a mixer to mix and mix for 10-30 minutes, each time The amount of mixing should not be too much, it is mixed according to the amount of a molded bipolar plate;

[0040] 3) Press the mixed expanded graphite, resin, carbon black / carbon fiber mixture into a pre-pressed plate with a certain thickness and shape, the thickness of the pre-pressed plate is 3-7mm, and the density is 0.2-1.0g / cm 3 , When pre-pressing, attention should be paid to the pressing distance and pressing time of the molding machin...

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Abstract

The invention discloses a manufacturing technique of a bipolar plate for a fuel battery. By using expanded graphite as a carbon base material and resin powder as an adhesive, carbon black is added in the composite material preparation process, so that small carbon black particles help to form conduction channels among the graphite particles, thereby enhancing the electric conductivity; and carbon fibers merged into the composite bipolar plate can generate favorable bending strength. Thus, the bipolar plate for a fuel battery, which has the advantages of favorable corrosion resistance, favorable electric and thermal conductivity, high gas barrier property, high mechanical strength and low cost, and can be prepared by a reasonable compounding process.

Description

Technical field [0001] The invention relates to a manufacturing process of a bipolar plate for a proton exchange membrane fuel cell. By molding a graphite bipolar plate and its manufacturing process, specifically, through an appropriate proportion of expanded graphite / resin / the third component, a reasonable The process method is to manufacture fuel cell bipolar plates by one-shot molding. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) converts chemical energy into electrical energy by chemically reacting fuel (hydrogen) and oxygen in the air. Its basic principle is to pass fuel (H 2 ), the oxidant (O 2 or air), and make them electrochemically react under the action of the catalyst to generate electricity, and the reaction product is only water, which is non-polluting to the environment. When the fuel cell is working normally, the internal fuel, oxidant and coolant must be effectively transported and separated by bipolar plates. Among the main ...

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 顾荣鑫管俊生张超沈军徐麟袁亦林李富国陈安定
Owner KUSN FUERSAI ENERGY
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