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Solid polymer electrolyte fuel cell system and operation method therefor

A fuel cell system, solid polymer technology, applied in solid electrolyte fuel cells, fuel cells, battery/fuel cell control devices, etc., can solve problems such as reduced start-up performance

Inactive Publication Date: 2006-02-15
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When starting from low temperature conditions, the system thus suffers from poor diffusion of reactant gases in the electrolyte membrane and delayed electrochemical reactions, reducing start-up performance

Method used

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  • Solid polymer electrolyte fuel cell system and operation method therefor
  • Solid polymer electrolyte fuel cell system and operation method therefor
  • Solid polymer electrolyte fuel cell system and operation method therefor

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0036] 1 is a block diagram showing the arrangement of a solid polymer electrolyte fuel cell system FC1 suitable for outdoor use, especially for fuel cell vehicles or the like, according to a first embodiment of the present invention, figure 2 A cross section of the cells (11 / 1 / 12) of the fuel cell body 10 of the fuel cell system FC1 is shown.

[0037] This system FC1 is characterized in that, after the generation of electric energy in the forward polarity is stopped, the electric energy is generated in the reverse polarity, thereby moving the hydrogen ions in the opposite direction.

[0038] That is, after cutting off the operation of the system FC1 generating electric energy with positive polarity, the gas passages 4, 7 of the first and second electrodes 11, 12 are cleaned by the cleaning gas, and moisture is removed from the gas diffusion layers 3, 6, Wherein the positive polarity supplies the fuel (hydrogen) to the first electrode 11 and the oxidant (air) to the second ele...

no. 2 example

[0074] Figure 4 is a block diagram showing the arrangement of a solid polymer electrolyte fuel cell system FC2 suitable for outdoor use, especially for fuel cell vehicles or the like, according to a second embodiment of the present invention. Cross-sectional reference of each single cell figure 2 .

[0075] This system FC2 is different from the above-mentioned system FC1 in that the magnitude (Ω) of the total impedance of the fuel cell main body 10 is detected (to detect the change in the average impedance value between the first electrode 11 and the second electrode 12 of each unit cell). ), for the determination of the time to complete the generation of electrical energy with opposite polarity.

[0076] That is, by applying an AC voltage across the interconnection circuit between the second electrode 26 and the fuel cell body 10 during the generation of electrical energy in the opposite polarity, the resistance detector 29 measures the AC current flowing through the circu...

no. 3 example

[0083] 5 is a block diagram showing the arrangement of a solid polymer electrolyte fuel cell system FC3 suitable for outdoor use, especially for fuel cell vehicles or the like, according to a third embodiment of the present invention, Image 6 A cross-section of the cells (11 / 1 / 12) of the fuel cell main body 10 of the fuel cell system FC3 is shown.

[0084] This system FC3 simplifies the gas connection, has a drive (33) for changing the polarity.

[0085] This system FC3 is characterized in that, after stopping the generation of electrical energy in the forward polarity, the current is conducted in the reverse direction, or the current is conducted in the reverse polarity (by applying a voltage), thereby moving the hydrogen ions in the opposite direction.

[0086] That is to say, when the normal operation of the system FC3, which generates electricity with positive polarity, is cut off, the gas channels 4, 7 of the first and second electrodes 11, 12 are cleaned by the cleaning...

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PUM

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Abstract

A normal operation of a fuel cell ( 10, 13, 17, 16, 20 ) for generating electricity with an electrolyte film ( 1 ) interposed between a first electrode ( 11 ) supplied with a fuel and a second electrode ( 12 ) supplied with an oxidizer, is followed by a shutdown operation in which the second electrode ( 12 ) is supplied with the fuel to generate hydrogen ions, andhydrogen ions are activated to move with accompanying water, thus transporting moisture, from the second electrode ( 12 ) to the first electrode ( 11 ) through the electrolyte film ( 1 ), by an electromotive force acting between the first and second electrodes ( 11, 12 ), as the force is produced therebetween by supplying the oxidizer to the first electrode ( 11 ), or as it is imposed therebetween from an external dc power supply ( 33 ).

Description

technical field [0001] The present invention relates to solid polymer electrolyte fuel cell systems and methods of operation thereof, and more particularly to solid polymer electrolyte fuel cell systems and methods of operation for mobile devices such as for vehicles or boats or for portable use. Background technique [0002] Generally speaking, a fuel cell system consists of a fuel cell body, which is used for an electrochemical reaction between a fuel (such as hydrogen) and an oxidant (such as air) in the presence of a catalyst, thereby directly converting the chemical energy of the fuel into electrical energy. [0003] The fuel cell body includes a fuel electrode and an oxidant electrode, and an electrolyte membrane disposed therebetween, and supplies fuel to the fuel electrode and oxidant to the oxidant electrode under normal operation. Since this electrolyte membrane is made of a solid high polymer, this fuel cell system is called a "solid polymer electrolyte fuel cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10H01M8/04
CPCY02T90/34H01M8/04223B60L11/1881H01M8/04231H01M8/04156Y02E60/50B60L58/30Y02T90/40H01M8/241H01M8/04228H01M8/2457H01M8/0258H01M8/04
Inventor 田尻和也下井亮一
Owner NISSAN MOTOR CO LTD