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Polymer electrolyte fuel cell

A polymer electrolyte, fuel cell technology, applied in solid electrolyte fuel cells, fuel cells, fuel cell components and other directions, can solve problems such as cost reduction and other advantages

Inactive Publication Date: 2007-07-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are restrictions on the gas flow path pattern processed on the separator, and it is necessary to perform post-processing to remove the strain after pressurization or to use a special material rich in stretchability, and as a result, there is a problem that the cost advantage is reduced.

Method used

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Examples

Experimental program
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Effect test

Embodiment approach 1

[0054] FIG. 1 shows a corrugated metal plate 10 obtained by press-working a metal plate such as stainless steel. In this embodiment, such a corrugated metal plate is used as it is for the conductive separator. The corrugated metal plate 10 has grooves 11 and protrusions alternately on one surface, and has protrusions and grooves 12 on the other surface corresponding to the grooves 11 and protrusions.

[0055] 2 and 3 show an MEA 20 constituting a galvanic cell stack alternately laminated with conductive separators made of the above-mentioned corrugated metal plates. As shown in FIG. 3, the MEA 20 is composed of a polymer electrolyte membrane 2, an air seal portion 30 composed of a thermoplastic resin or a thermoplastic elastomer integrally covering the peripheral portion of the membrane 2, and a negative electrode 3 bonded to the exposed surface of the membrane 2. The positive electrode 4 constitutes. The negative electrode and the positive electrode consist of a catalyst la...

Embodiment approach 2

[0066] In Embodiment 1, ribs 31 , 32 and the like are provided on the gas seal portion 30 of the MEA in order to prevent gas from leaking between the metal plate 10 and the MEA. In Embodiment 2, it is shown that these rib parts are moved from the gas seal portion 30 to the metal plate 10 side.

[0067] In this embodiment, as shown in FIG. 7 , seals 31 a and 32 a made of the same material as the gas seal are integrally bonded to the metal plate 10 by injection molding or the like to replace the ribs 31 and 32 of the gas seal 30 . The MEA 20a combined with such a conductive separator made of a metal plate has a flat plate shape as shown in FIG. 8 . Also, there are grooves 33a and 34a for inducing gas.

Embodiment approach 3

[0069] The MEA 20b is shown in FIG. 9 . This MEA is different from the MEA shown in FIG. 2 in that a manifold is provided, and has the same structure otherwise. That is, the gas seal portion 30 has a pair of grooves 33 b for guiding the oxidant gas across the negative electrode of the electrode portion 1 , and ribs 32 b closing the ends of the grooves 11 of the metal plate 10 . Similarly, ribs for closing a pair of grooves (corresponding to grooves 34 in FIG. 2 ) for guiding fuel gas and the ends of the grooves 12 of the metal plate 10 are provided on the surface having the positive electrode.

[0070] The gas seal unit 30b has an oxidant gas manifold 37 and a fuel gas manifold 38 on side portions of the oxidant gas guide groove 33b and the fuel gas guide groove, and cooling water manifolds 39 on both ends. The air seal portion 30b also has ribs 31b on the peripheral edge.

[0071] In a galvanic battery using such an MEA, the oxidant gas supplied from one of the pair of mani...

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Abstract

A polymer electrolyte fuel cell comprising: a plurality of conductive separator plates, each comprising a corrugated metal plate; an electrolyte membrane-electrode assembly inserted between the separator plates, the electrolyte membrane-electrode assembly including a hydrogen-ion conductive polymer electrolyte membrane having its periphery covered with a gasket, an anode attached to one side of the electrolyte membrane, and a cathode attached to the other side of the electrolyte membrane; and gas charge and discharge means for charging and discharging a fuel gas and an oxidant gas to and from the anode and the cathode, respectively, wherein the gas charge and discharge means charges and discharges the fuel gas to and from the anode through the grooves on one side of the corrugated metal plate and charges and discharges the oxidant gas to and from the cathode through the grooves on the other side of the corrugated metal plate.

Description

[0001] This application is a divisional application of an invention patent application with the application number 01802621.4, the application date being February 8, 2001, and the invention title being "Polymer Electrolyte Fuel Cell". technical field [0002] The present invention relates to a polymer electrolyte fuel cell used in a portable power supply, a power supply for an electric vehicle, and a small power generation system in a home, and particularly relates to the improvement of its conductive separator. Background technique [0003] A fuel cell using a polymer electrolyte generates electricity and heat simultaneously by electrochemically reacting a fuel gas containing hydrogen and an oxidant gas containing oxygen such as air. Such a fuel cell basically consists of an electrolyte membrane that selectively transports hydrogen ions, and a pair of electrodes, namely, a positive electrode and a negative electrode, formed on both sides of the polymer electrolyte membrane. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/10H01M8/02H01M8/0206H01M8/0228H01M8/0247H01M8/0254H01M8/0267H01M8/0271H01M8/04029H01M8/1004H01M8/241
CPCY02E60/521Y02E60/50
Inventor 小原英夫松本敏宏菅原靖山崎达人新仓顺二羽藤一仁神原辉寿
Owner PANASONIC CORP
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