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Fuel cell and fuel cell stacks equipped with this

A fuel cell and fuel gas technology, which is used in fuel cell parts, fuel cells, fuel cell additives, etc., and can solve problems such as difficulty in maintaining power generation performance

Inactive Publication Date: 2007-05-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alternatively, part of the reaction gas flows to the outside of the MEA 105 through the cathode-side gap 110a and the anode-side gap 110b instead of flowing through the cathode 104a and the anode 104b, making it very difficult to maintain power generation performance

Method used

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  • Fuel cell and fuel cell stacks equipped with this
  • Fuel cell and fuel cell stacks equipped with this
  • Fuel cell and fuel cell stacks equipped with this

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0114] 1 is a schematic cross-sectional view of a relevant part of a polymer electrolyte fuel cell according to Embodiment 1 of the present invention, illustrating its basic structure. FIG. 2 is a front view of the main surface of the positive electrode side separator 6a of the fuel cell 10 shown in FIG. 1 viewed from the side of the cooling fluid passage 8a. FIG. 3 is a front view of the main surface of the anode-side separator 6 a of the fuel cell 10 shown in FIG. 1 viewed from the gas channel 7 a side. Fig. 4 is a front view of the main surface of the anode-side separator 6b of the fuel cell 10 shown in Fig. 1 viewed from the side of the gas channel 7b. Fig. 5 is a front view of the main surface of the anode-side separator 6b of the fuel cell 10 shown in Fig. 1 viewed from the side of the cooling fluid passage 8b.

[0115] 6 is a schematic cross-sectional view of the fuel cell 10 obtained along line X-X in FIG. 1 (with the positive electrode separator 6a removed, the membr...

Embodiment approach 2

[0209]Now, a fuel cell according to Embodiment 2 of the present invention is described. The fuel cell and the fuel cell stack (not shown) according to Embodiment 2 have the same structure as the fuel cell 10 and the fuel cell stack 30 of Embodiment 1, except for the positive electrode side separator and the negative electrode side separator, because the positive electrode side The separator and the negative side separator are replaced with different structures.

[0210] The cathode-side separator and the anode-side separator of the fuel cell according to Embodiment 2 are described below.

[0211] 11 is a front view of the main surface of the positive electrode side separator 26a incorporated into the fuel cell according to Embodiment 2 of the present invention viewed from the side of the cooling fluid passage 8a. 12 is a front view of the main surface of the positive electrode side separator 26a incorporated into the fuel cell according to Embodiment 2 of the present inventio...

Embodiment approach 3

[0239] A fuel cell according to Embodiment 3 of the present invention will now be described. The fuel cell and the fuel cell stack (not shown) according to Embodiment 3 have the same structure as the fuel cell 10 and the fuel cell stack 30 of Embodiment 1, except for the positive electrode side separator and the negative electrode side separator, because the positive electrode side The separator and the negative side separator are replaced with different structures.

[0240] The cathode-side separator and the anode-side separator of the fuel cell according to Embodiment 3 are described below.

[0241] 15 is a front view of the main surface of the positive electrode side separator 46a incorporated into the fuel cell according to Embodiment 3 of the present invention viewed from the side of the cooling fluid passage 8b. 16 is a front view of the main surface of the positive electrode side separator 46a incorporated into the fuel cell according to Embodiment 3 of the present inv...

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Abstract

Even when a reaction gas flows into a gap formed between a gasket and a membrane electrode assembly, the flowing of the reaction gas to the outside without flowing through an electrode is prevented and thus a decrease in power generation efficiency is prevented. In order to allow the water vapor contained in the reaction gas that flows into an anode-side gap 10a formed between an anode-side gasket 9a and a membrane electrode assembly 5 to condense in at least a part of the gap 10a, and to allow the condensed water to fill the gap 10a, the upstream portion of a cooling fluid channel 8a of an anode-side separator 6a is formed such that it includes a region corresponding to the gap 10a, and the upstream portion is formed such that it includes a region corresponding to a middle stream portion and subsequent portion of a fuel gas channel 7a.

Description

technical field [0001] The present invention relates to a fuel cell (in particular, to a polymer electrolyte fuel cell), and a fuel cell stack including the fuel cell. Background technique [0002] A polymer electrolyte fuel cell is a battery that simultaneously generates electricity and heat by electrochemically reacting a fuel gas such as hydrogen and an oxidizing gas such as air with each other at gas diffusion electrodes serving as positive and negative electrodes. Fig. 22 shows a typical structure of such a polymer electrolyte fuel cell. As shown in FIG. 22, the fuel cell 100 includes at least one unit cell (cell) mainly composed of a membrane electrode assembly (MEA) 105 and a pair of separators sandwiching the membrane electrode assembly 105, that is, positive electrode side separators 106a. and the negative side separator 106b. [0003] Membrane electrode assembly 105 has a structure in which polymer electrolyte membrane 101 that selectively transports cations (hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/10H01M50/77
CPCH01M8/0267H01M8/0258H01M2008/1095H01M8/0273H01M8/0263Y02E60/521H01M8/04007H01M8/04089Y02E60/50H01M8/04029H01M8/04291H01M8/2483H01M8/241H01M8/2457
Inventor 玄番美穗武部安男辻庸一郎堀喜博关安宏
Owner PANASONIC CORP
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