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Metallic bipolar plate for fuel cells, and fuel cell comprising the same

A metal bipolar plate and fuel cell technology, which is applied to fuel cell parts, fuel cells, battery electrodes, etc., can solve the problems of difficult manufacturing, high manufacturing cost, and unfavorable cost of bipolar plates, and achieve low cost and high efficiency. Effects of corrosion resistance and good battery characteristics

Inactive Publication Date: 2008-02-13
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this requires precise plating techniques and is more difficult to manufacture, so its manufacturing cost will be higher
So overall, this bipolar plate is unfavorable in terms of cost

Method used

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  • Metallic bipolar plate for fuel cells, and fuel cell comprising the same
  • Metallic bipolar plate for fuel cells, and fuel cell comprising the same
  • Metallic bipolar plate for fuel cells, and fuel cell comprising the same

Examples

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[0130] The present invention will now be described more specifically with reference to the examples given below.

[0131] Double-sided bipolar plates of Examples 1R to 17R and Comparative Examples 1R and 2R, and single-sided bipolar plates of Examples 1K to 14K and Comparative Examples 1K to 3K were prepared.

[0132] Specifically, the noble metal layer partially coats the front and back sides of the metal substrate by electroplating, wherein the noble metal layer is formed using the materials shown in Table 1 and Table 2 and has the thickness shown in the table, and the metal substrate uses the materials shown in Table 1 and Table 2. The materials shown in Table 2 were formed and had the thicknesses shown in the table.

[0133] In this step, considering the shape of the concave-convex part to be formed in the subsequent steps, the electroplating method is designed as follows: the noble metal layer can have the coating area ratio shown in Table 1 and Table 2, and use FIG. 5 or...

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Abstract

The present invention relates to a metallic bipolar plate for fuel cells, including: a plate-like metallic substrate containing a metal capable of being passivated; and a noble-metal layer disposed partially on both surfaces of the metallic substrate to coat the metallic substrate, the metallic bipolar plate having a concave-convex portion formed at least in a region facing an electrode of a membrane electrode assembly, in which both surfaces of the metallic bipolar plate respectively have a contact surface which contacts with the electrode and a non-contact surface which does not contact with the electrode, and in which both surfaces of the metallic bipolar plate respectively have a coating area ratio of the noble-metal layer to the contact surface within a range of from 20% to 100%, and a coating area ratio of the noble-metal layer to the non-contact surface within a range of from 5% or more but less than 100%.

Description

technical field [0001] The present invention relates to a metal bipolar plate for a fuel cell and a fuel cell comprising the metal bipolar plate. Background technique [0002] As fuel cells, polymer electrolyte fuel cells (PEFC), sulfuric acid fuel cells (PAFC), molten carbonate fuel cells (MCFC), solid oxide fuel cells (SOFC) and the like are known. [0003] Generally, these fuel cells are provided in the form of a power stack constructed by alternately stacking a plurality of membrane electrode assemblies with bipolar plates interposed therebetween, each membrane electrode assembly comprising sequentially stacked fuel electrodes. , electrolyte and air electrode. [0004] Generally, a bipolar plate has concavo-convex portions in a region facing an electrode (fuel electrode or air electrode) of the membrane electrode assembly. Among these concave-convex portions, the convex portion is in contact with the electrode surface, while the concave portion is not in contact with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86
CPCH01M8/0258Y02E60/50H01M8/0228H01M8/0206H01M8/0254H01M8/0265H01M8/021H01M8/0263H01M8/02
Inventor 高木忍久田建男布藤正义
Owner DAIDO STEEL CO LTD
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