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Method for manufacturing fuel cell separator

A fuel cell and manufacturing method technology, which is applied to fuel cells, fuel cell parts, solid electrolyte fuel cells, etc., can solve the problems of reduced hydrophilicity, reduction and disappearance of hydrophilic groups, etc., and achieves high adhesion. , Good hydrophilicity, long-lasting effect of hydrophilicity

Active Publication Date: 2018-03-27
NISSHINBO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, if the fuel cell separator, the gasket, and the sealing plate are bonded after the hydrophilic treatment as in this method, the hydrophilic surface may be polluted, or the hydrophilic group may decrease or disappear, thereby reducing the hydrophilicity.

Method used

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  • Method for manufacturing fuel cell separator

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preparation example Construction

[0056] The preparation of the composition can be prepared, for example, by mixing graphite powder, epoxy resin, and phenol resin in predetermined proportions in any order. In this case, as the mixer, for example, a planetary mixer, a ribbon mixer, a ladyge mixer, a Henschel mixer, a rock mixer, a Nauta mixer, or the like can be used.

[0057] Moreover, when arbitrary components, such as a hardening accelerator and an internal mold release agent, are used, the compounding order is also arbitrary.

[0058] In the present invention, the above-mentioned composition is put into a predetermined mold and press-molded to produce a preform. As the mold used, a fuel cell separator production mold capable of forming grooves serving as gas flow paths on one or both surfaces of the molded body was used.

[0059] The conditions for press molding are not particularly limited, the mold temperature is 80-200°C, the molding pressure is 1.0-50MPa, preferably 5.0-40MPa, the molding time is 10 se...

Embodiment 1

[0108] (1) After roughening and before gasket formation

[0109] (2) After the gasket is formed

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Abstract

A method for manufacturing a fuel cell separator, provided with: (A) a press molding step in which a composition containing a graphite powder, an epoxy resin, and a phenol resin is press-molded underheat in a mold to obtain a molded article having a groove that serves as a gas channel on one or both surfaces; (B) a roughening step for roughening the entirety of both surfaces of the molded article; (C) a gasket formation step for forming a gasket on the peripheral edge part of the gas channel surface having the groove that serves as a gas channel in the roughened molded article; (D) a laser irradiation step for irradiating the portion of the gas channel surface where the gasket is not formed, and at least the peak part and the bottom part of the groove that serves as a gas channel, with infrared laser light; and (E) a hydrophilization step for rendering the entire gas channel surface hydrophilic. This manufacturing method makes it possible to obtain a separator having excellent sealingproperties in which a decrease in hydrophilic properties due to gasket lamination is prevented and excellent adhesion is obtained between the gasket and the separator.

Description

technical field [0001] The present invention relates to a method for manufacturing a fuel cell separator, and more specifically, to a method for manufacturing a fuel cell separator provided with a gasket. Background technique [0002] The fuel cell separator plays a role of making each unit cell electrically conductive and a role of a separating boundary wall while ensuring passages of fuel and air (oxygen) supplied to the unit cells. [0003] Therefore, separators are required to have various characteristics such as high electrical conductivity, high gas impermeability, chemical stability, heat resistance, and hydrophilicity. [0004] Such a separator may be subjected to shot blasting to remove the surface layer or adjust the surface roughness, or a hydrophilic treatment to increase hydrophilicity, and may be laminated with a gasket for sealing on the periphery of the separator if necessary. piece. [0005] For example, Patent Document 1 discloses a method for producing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0202H01M8/0271H01M8/10
CPCH01M8/0271B29C43/003B29K2063/00H01M8/0213H01M8/0226H01M8/026Y02P70/50Y02E60/50H01M8/0228H01M8/0258B29C43/006H01M8/0221
Inventor 丹野文雄
Owner NISSHINBO CHEM