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Polymer electrolyte fuel battery

A fuel cell and electrolyte technology, which is used in solid electrolyte fuel cells, fuel cells, and fuel cell components, etc., can solve the problems of reduced power generation efficiency and increased power consumption of fuel cell systems.

Inactive Publication Date: 2007-02-07
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method contributes to the fact that increasing the gas pressure loss in the polymer electrolyte fuel cell causes an increase in power consumption due to auxiliary devices such as a compressor for supplying gas, resulting in a decrease in power generation efficiency of the entire fuel cell system

Method used

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  • Polymer electrolyte fuel battery

Examples

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Effect test

no. 1 example

[0031] figure 1 is an exploded sectional view illustrating a polymer electrolyte fuel cell according to an embodiment of the present invention. This fuel cell 1 is composed of a battery unit 2, separators 3a, 3b arranged on both sides of the battery unit 2 so that the battery unit 2 is inserted between them, and separators 3a, 3b arranged between the above-mentioned battery unit 2 and the separators 3a, 3b. Diffusion layer 4 composition.

[0032] The battery 2 described above consists of a solid polymer membrane 5 with reaction layers 6a, 6b arranged on both sides of the membrane 5 .

[0033] The solid polymer membrane 5 is, for example, a membrane formed of perfluorosulfonic acid.

[0034] Each of the above-mentioned diffusion layers 4 is composed of a carbon paper 7, also called a substrate, and a slip layer 8 formed on one of its main surfaces. This carbon paper can be replaced by another conductive porous material such as carbon cloth or non-woven carbon fiber. The sli...

no. 2 example

[0048] see now Figure 5 . Figure 5 is a schematic sectional view of a diffusion layer and a separator constituting a PEFC according to a second embodiment of the present invention. In this embodiment, the partition 25 has a protruding portion 26 having a greater thickness than its surroundings. Corresponding to this protruding portion 26, the carbon paper 27 has a compression layer (gas barrier) 28 formed so as to be concave than its surroundings. A slip layer 8 is formed on the above-mentioned carbon paper 27 having the above-mentioned compressed layer 28 .

[0049] Therefore, according to the second embodiment, the convex portion 26 having a larger thickness than its periphery is formed on a predetermined position of the separator 25, and the compression layer 28 corresponding to the convex portion 26 is formed on the carbon paper 27. As a result, like the first embodiment, water retention in the battery can be prevented and uniform power generation can be obtained over...

no. 3 example

[0051] see now Figure 6 . Figure 6 is a schematic sectional view of a diffusion layer constituting a PEFC according to a third embodiment of the present invention. In this embodiment, the gas barrier includes a resin-impregnated layer 31 formed by impregnating a resin into a portion of carbon paper (substrate) 21 intended for gas barrier formation. This resin-impregnated layer 31 is airtight and does not allow gas to pass through. A slip layer 8 is formed on the carbon paper 27 having the resin-impregnated layer 31 described above.

[0052] Therefore, according to the third embodiment, the resin-impregnated layer 31 having airtightness is formed in the portion of the carbon paper 21 intended for gas barrier formation. As a result, like the first embodiment, water retention in the battery can be prevented and uniform power generation can be obtained over the entire surface of the battery. Furthermore, a uniform gas flow rate can be obtained over the entire surface of the ...

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Abstract

A polymer electrolyte fuel cell comprising a cell having a solid polymer film, separators disposed on both sides of the cell so as to interpose the cell therebetween, and diffusion layers disposed between the cell and the separators and each having a substrate comprising an electrically conductive porous material and a slurry layer disposed on the substrate, wherein at least a part of each diffusion layer is provided with a gas barrier for preventing the permeation of gas in a direction parallel to the major surface of the diffusion layer.

Description

technical field [0001] The present invention relates to improvements in polymer electrolyte fuel cells (PEFCs). Background technique [0002] Conventionally, a polymer electrolyte fuel cell consists of a battery unit, two separators arranged on both sides of the battery unit so that the battery unit is inserted between them, and a diffusion layer arranged between the above-mentioned battery unit and the separator composition. [0003] The battery described above comprises a solid polymer membrane with two reactive layers arranged on either side of the membrane. Each of the above diffusion layers comprises carbon paper and a slip layer formed on one major surface thereof. A groove for passage of hydrogen gas is formed in the cell-facing surface of one separator, and a groove for passage of air is formed in the other separator. [0004] However, conventional separators used in polymer electrolyte fuel cells have a problem in that fuel gas and oxidant gas do not flow accordi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M8/10H01M4/86
CPCH01M8/0234H01M8/0245H01M8/0239H01M4/8605Y02E60/50H01M8/0241H01M8/1002H01M8/1007H01M4/86H01M8/02
Inventor 伊藤栄基小林敏郎森贺卓也山田昭彦
Owner MITSUBISHI HEAVY IND LTD
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