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Manufacturing method of fuel cell separator, and fuel cell

A technology for fuel cells and production methods, which is applied to components of fuel cells, fuel cells, solid electrolyte fuel cells, etc., can solve problems such as reduced dimensional accuracy and reduced air tightness of bipolar plates.

Inactive Publication Date: 2006-02-22
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] However, we cannot solve (relieve) certain problems with the above-mentioned prior art, for example, the decrease of the airtightness of the bipolar plate due to thickness variation and Dimensional Accuracy Degradation Problem

Method used

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  • Manufacturing method of fuel cell separator, and fuel cell
  • Manufacturing method of fuel cell separator, and fuel cell
  • Manufacturing method of fuel cell separator, and fuel cell

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0078] The nonwoven fabric holding the conductive powder used in the present invention can be produced by a known method of producing a nonwoven fabric such as a wet method or a dry method. A specific example of the production method will be described below.

[0079] (i) An example illustrated is the use of a wet process to produce the nonwoven fabric used in the present invention

[0080] A slurry is prepared by mixing thermoplastic resin fibers and conductive powder and dispersing them in water. During the preparation of the slurry, thermoplastic resin fibers are entangled in water to form entanglements (fibrous webs) within which the conductive powder particles are held. At this time, surfactants and thickeners can be added appropriately to stabilize the slurry.

[0081] The slurry is then poured on a metal screen where the fibers and powder are evenly collected. Next, the collected material is dehydrated with a dehydration roller, a heating drier and / or a vacuum dehydra...

Embodiment 1

[0140] 80 parts by weight of synthetic graphite (irregular shape, average particle size 88 μm) as conductive powder and 20 parts by weight of polyphenylene sulfide resin staple fiber (1 μm in diameter; 1 mm in length) as thermoplastic resin fibers were placed in air While mixing in a mixer, the thermoplastic resin fibers are fibrillated. The resulting mixture was fed to a nozzle having a small orifice of circular ring diameter while spraying compressed air from the compressed air inlet just upstream of the nozzle. The mixture is passed through a deflector located in front of the nozzle, thereby fibrillating the thermoplastic resin fibers and dispersing the conductive powder. The thermoplastic resin fibers and conductive powder are then collected to form a fiber web containing conductive powder. The web was passed through a pressure roll heated to 300° C., which is higher than the melting temperature of the resin (280° C.), to obtain a nonwoven fabric having a thickness of 0.2...

Embodiment 2

[0143] In addition to using 70 parts by weight of synthetic graphite (irregular shape, average particle size of 88 μm) as conductive powder and 30 parts by weight of polyphenylene sulfide resin staple fiber (1 μm in diameter; 1 mm in length) as thermoplastic resin fibers, A nonwoven fabric was obtained with the same method and conditions as in Example 1.

[0144] The non-woven fabric is cut into 30 sheets with a given size (250×250mm) consistent with the shape of the bipolar plate, and these 30 sheets are stacked and heated to 300°C in a furnace to melt the polyphenylene sulfide resin . The nonwoven fabric in a molten state was then quickly fed into a mold loaded in a compression molding machine and heated to 150° C., molded under a pressure of 60 MPa, and then cooled and solidified. This produced a rib molding having a width of 25 cm, a thickness of 2 mm, and a length of 25 cm in the shape shown in FIG. 4 . The molding cycle was 30 seconds.

[0145] A flat-plate-shaped mol...

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Abstract

A method for manufacturing fuel cell bipolar plates involves heating and softening a nonwoven fabric including an electrically conductive powder and thermoplastic resin fibers of 0.1 to 20 mum diameter, and shaping the softened nonwoven fabric.

Description

technical field [0001] The present invention relates to a method of producing fuel cell bipolar plates used in fuel cells such as phosphoric acid fuel cells and solid polymer fuel cells used as automotive power sources, portable power sources and emergency power sources. The invention also relates to fuel cells. [0002] This application claims priority from Japanese Patent Application No. 2003-130170 filed May 8, 2003, which is incorporated herein by reference. Background technique [0003] Fuel cells that extract the energy obtained by the electrochemical reaction of hydrogen and oxygen as electrical energy have begun to be used in various fields including automobiles. These fuel cells generally consist of basic structural units (unit cells) stacked in series, which include a dielectric membrane, electrodes and bipolar plates. This ensures that electrical energy (power generation) is obtained. [0004] The bipolar plates used in these fuel cells need to be electrically ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/10
CPCH01M8/0226H01M2008/1095H01M8/0221H01M8/0234H01M8/0213H01M8/0263Y02E60/523H01M8/0239H01M8/0243H01M8/086Y02E60/50Y02P70/50
Inventor 蒋建业原田哲哉井筒齐
Owner DAINIPPON INK & CHEM INC
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