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Fuel cell system

A fuel cell system and fuel cell technology, applied in the direction of fuel cells, fuel cell additives, solid electrolyte fuel cells, etc., can solve problems such as failure and freezing of fuel cell systems

Inactive Publication Date: 2007-01-03
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This solid PEFC has the following problems: (1) too much water produced by electrochemical reaction in the oxidant electrode inhibits the diffusion of oxidant gas in the oxidant electrode; down freeze
These problems lead to the failure of fuel cell systems with solid PEFC

Method used

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Examples

Experimental program
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no. 1 example

[0021] figure 1 is a block diagram showing the structure of the fuel cell system according to the first embodiment of the present invention. This fuel cell system includes: a fuel cell 1, which is supplied with fuel gas and oxidant gas for generating electric power; Reacted oxidant discharge; fuel supply / discharge line 3 through which fuel is supplied to fuel cell 1 and unreacted fuel in fuel cell 1 is discharged; external power source 4; fuel amount detection part 5; fuel storage tank 6 ; Valves 7, 8, 9; Compressor 10;

[0022] The external power source 4 is a power source that is disconnected from the fuel cell 1 during normal operation and operates to apply current to the fuel cell 1 during the performance recovery operation of the fuel cell 1, that is, when excess water is removed from the oxidant electrode, as Figure 5A , 5B As shown in , it consists of a power supply 41 and a switch 42.

[0023] Such as Figure 5A and 5B As shown in , the controller 11 controls th...

no. 2 example

[0058] The fuel cell system of the second embodiment is characterized in that, compared with the fuel cell system of the first embodiment, no figure 1 The fuel amount detecting part 5 shown in , and, in another way, the electric current is applied to the fuel cell 1 from the external power source 4, as Figure 7As shown, the mode is preset so as to provide the current value A1 and the on-time T1 for the current flowing from the oxidant electrode to the fuel electrode, and provide the current value A2 and the on-time T2 for the current flowing from the fuel electrode to the oxidizer electrode. In addition, the ON time for applying current to the fuel cell 1 is calculated based on the amount of fuel required for restoring the performance of the fuel cell.

[0059] The basic sequence of the performance recovery operation performed in the fuel cell of the second embodiment employs the following as Figure 8 The sequence shown in , where the Figure 4 The judgment in steps S16 an...

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PUM

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Abstract

A fuel cell system and a method of operating a fuel cell system are disclosed wherein an external electric source ( 4 ) is provided to apply current to a fuel cell ( 1 ), comprised of a polymer electrolyte membrane-electrode catalyst complex having a polymer electrolyte membrane ( 21 ) sandwiched between a fuel electrode ( 24 A) and an oxidant electrode ( 24 B) and separators ( 26, 28 ) formed with flow channels ( 27, 29 ) to supply fuel and oxidant to the polymer electrolyte membrane-electrode catalyst complex, and operative to change a direction in which current is applied to the fuel cell ( 1 ).

Description

technical field [0001] The present invention relates to fuel cell systems for mitigating water overload conditions in cathodes. Background technique [0002] Recent environmental problems, particularly air pollution caused by automobile smog and global warming caused by carbon dioxide and other greenhouse gases, require fuel cell systems that enable clean exhaust and high energy efficiency. [0003] In general, a fuel cell is an electrochemical device based on the electrical interaction between a fuel such as hydrogen or hydrogen-rich reformed gas and an oxidant such as air in a polymer electrolyte membrane-electrode catalyst complex. A chemical reaction that converts the chemical energy of the fuel directly into electrical energy. In particular, a solid polymer electrolyte fuel cell (solid PEFC) that uses a solid polymer separator as an electrolyte and produces high power density has attracted attention as a power source for mobile bodies such as automobiles. [0004] Thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04H01M8/00H01M8/06H01M8/10
CPCH01M8/04156H01M8/04455H01M8/04507H01M8/04955H01M8/04231Y02E60/50H01M8/04238H01M8/0441H01M8/04895H01M8/04559H01M2008/1095H01M8/0438H01M8/04395H01M8/04253H01M8/0491H01M8/04649H01M8/04753H01M8/04917H01M8/04223H01M8/0447H01M8/04225H01M8/04302
Inventor 各务文雄
Owner NISSAN MOTOR CO LTD