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Fuel cell separator conductive sheet and fuel cell separator

A technology for fuel cells and separators, which is applied to fuel cell parts, fuel cells, circuits, etc., can solve the problems of poor fiber entanglement, low strength of separators, and poor formability, etc. Uniform distribution or aggregation, excellent strength, and the effect of improving bending elasticity

Pending Publication Date: 2020-04-10
NISSHINBO IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following problems: the granulation process and the conveying process before molding take time, and since the conductive filler is contained in a high proportion to obtain electrical conductivity, the strength of the obtained separator is low and it is easy to break (the wall thickness cannot be achieved). Thinning) etc.
However, even with such a method, there is a problem that the individual fibers between the compounds cannot be entangled well because the fibrous substance cannot be uniformly dispersed, and when the fibrous substance is increased enough to be conveyed in sheet form, there is a problem that When the strength of the precursor is lowered, the formability is deteriorated, etc.

Method used

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  • Fuel cell separator conductive sheet and fuel cell separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0073] 73 parts by mass of artificial graphite, 6 parts by mass of PAN-based carbon fiber, 4 parts by mass of cellulose fiber and 17 parts by mass of PP fiber were put into water and stirred to obtain a fiber material slurry. This slurry was sheeted to prepare a conductive sheet A. The basis weight of conductive sheet A is 264g / m 2 .

Embodiment 1-2

[0075] 84 parts by mass of artificial graphite, 6 parts by mass of PAN-based carbon fiber, 5 parts by mass of cellulose fiber and 5 parts by mass of PP fiber were put into water and stirred to obtain a fiber material slurry. This slurry was sheeted to prepare a conductive sheet B. The basis weight of conductive sheet B is 229g / m 2 .

Embodiment 2-1

[0080] The conductive sheet A was placed at 185° C. for 5 minutes to obtain a resin-impregnated precursor. A fuel cell separator A (thickness 0.15 mm) was obtained by naturally cooling and compression-molding the precursor from a mold temperature of 185° C. to 100° C. while maintaining a molding pressure of 47 MPa.

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Abstract

Provided is a fuel cell separator conductive sheet comprising a conductive filler, first organic fibers, and second organic fibers, wherein the melting point of the first organic fibers is higher thana heating temperature at which the conductive sheet is shaped to produce a fuel cell separator, and the melting point of the second organic fibers is lower than the heating temperature.

Description

technical field [0001] The present invention relates to a conductive sheet for a fuel cell separator and a fuel cell separator. Background technique [0002] The fuel cell separator functions as a separation boundary wall for imparting electrical conductivity to each unit cell and securing passages for fuel and air (oxygen) supplied to the unit cells. Therefore, separators are required to have various characteristics such as high electrical conductivity, high gas-impermeability, chemical stability, heat resistance, and hydrophilicity. [0003] As a method for producing a fuel cell separator, a method in which a compound obtained by granulating a conductive filler and a binder resin is filled in a mold and then compression-molded is mentioned. However, this method has the following problems: the granulation process and the conveying process before molding take time, and since the conductive filler is contained in a high proportion to obtain conductivity, the strength of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0221B29C43/18H01M8/0226
CPCH01M8/0202H01M8/0221H01M8/0226B29C43/18Y02P70/50Y02E60/50H01M8/0213B29C70/02H01M8/0267
Inventor 安田光介大庆岳洋芦崎翔也
Owner NISSHINBO IND INC
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