Fuel cell separator

A fuel cell and separator technology, which is applied in the direction of fuel cells, fuel cell parts, power system fuel cells, etc., can solve the problem of increased contact resistance between the separator and the power generation unit, easy oxidation, titanium substrate and conductive carbon film Resisting problems such as weak adhesion, and achieving the effect of suppressing the increase in contact resistance and improving corrosion resistance

Pending Publication Date: 2019-07-02
TOYOTA JIDOSHA KK
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in the separators obtained by the production methods disclosed in Patent Documents 1 and 2, there may be regions where the adhesion force between the titanium substrate and the conductive carbon film is weak.
In the weak adhesion area, the

Method used

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Example Embodiment

[0033] Hereinafter, the structure of this invention is demonstrated in detail based on an example of embodiment shown in drawing. Hereinafter, as an example, a case where the present invention is applied to a fuel cell mounted on a fuel cell vehicle or a fuel cell system including the same will be described, but the scope of application is not limited to such an example.

[0034] 1. Fuel cell 10 including separator 3

[0035] figure 1 It is a schematic cross-sectional view of a main part of a fuel cell 10 including a separator 3 according to an embodiment of the present invention. like figure 1 As shown, a fuel cell (fuel cell stack) 10 is stacked with a plurality of cells (single cells) 1 as basic units. Each cell 1 is a solid polymer fuel cell that generates an electromotive force through an electrochemical reaction between an oxidant gas (for example, air) and a fuel gas (for example, hydrogen gas). The battery 1 includes: a MEGA (Membrane Electrode & Gas Diffusion Layer A

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Abstract

A method for manufacturing a fuel cell separator that ensures an improved corrosion resistance under usage environment of a fuel cell and restraining an increase of a contact resistance with a power generation unit by enhancing a sticking force of a conductive carbon film formed on a surface in contact with the power generation unit on a surface of a titanium substrate is provided. It is a methodfor manufacturing a fuel cell separator. The fuel cell separator 3 includes a contact portion 31 that is in contact with a power generation unit 2 so as to partition the power generation units 2 including electrodes 6 of the fuel cell 10, and includes a conductive carbon film 3e formed on the contact portion 31. First, a titanium substrate 3A that has a plurality of projecting portions 31A formedcorresponding to a shape of the contact portion 31 and recessed portions 21A for gas flow channels formed between the projecting portions 31A are prepared as a substrate of the separator 3. Next, a heat treatment is performed on the titanium substrate 3A in a state where a carbon sheet 9 is brought in contact with the projecting portions 31A such that carbon of the carbon sheet 9 diffuses in the projecting portions 31A.

Description

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Claims

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Application Information

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Owner TOYOTA JIDOSHA KK
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