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Shut-down procedure for a fuel cell fed with pure oxygen

A fuel cell and pure oxygen technology, applied in fuel cells, fuel cell additives, power system fuel cells, etc., can solve problems such as easy freezing and water residue

Active Publication Date: 2008-12-17
SOCIETE DE TECH MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] While this solution does effectively achieve a fast and controlled shutdown of the fuel cell without resorting to a nitrogen supply, the conditions in which the cell is shut down leave some water remaining, especially in the cathode gas path, a well known problem in fuel cells, This makes it prone to freezing and makes starting at temperatures below 0°C problematic

Method used

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  • Shut-down procedure for a fuel cell fed with pure oxygen
  • Shut-down procedure for a fuel cell fed with pure oxygen
  • Shut-down procedure for a fuel cell fed with pure oxygen

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Embodiment Construction

[0032] Figure 2 shows a fuel cell 1 of the electrolyte type, ie of the PEFC type, in the form of a polymer membrane. The fuel cell 1 is supplied with two gases, fuel (hydrogen stored or generated on board the vehicle) and oxidant (pure oxygen), which are supplied to the electrodes of the electrochemical cell. For simplicity, FIG. 2 shows only elements of the gas circuit that are useful for understanding the invention.

[0033] The device comprises a fuel gas path 11 on the anode side. The figure shows that pure hydrogen H 2 The tank is connected to the inlet of the anode gas circuit of the fuel cell 1 through a supply line that passes through a hydrogen supply valve 110 and then through an ejector 113 . A pressure sensor 111 is installed on this line just before the inlet of the fuel cell 1 . The circulation gas path 11R is connected to the outlet of the anode gas path of the fuel cell 1 . Eductor 113 and circulation pump 115 are used to circulate unconsumed gas through wa...

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Abstract

A shut-down procedure for an electricity delivery system comprising a fuel cell, the cell being fed with pure oxygen as oxidant and delivering an electrical voltage to an electrical power line. The electricity delivery system comprises a fuel gas circuit on the anode side, and a pure oxygen circuit on the cathode side. The shut-down procedure comprises the steps of an initial step during which the oxygen gas feed is interrupted, and an electrical consumption phase during which a hold current is drawn from the fuel cell until the pressure in the oxygen circuit reaches the water vapour pressure.

Description

technical field [0001] The invention relates to fuel cells, especially the application of fuel cells in automobiles. Background technique [0002] Fuel cells are known to generate electrical energy directly by electrochemical oxidation-reduction reactions of hydrogen (fuel) and oxygen (oxidant), without conversion of mechanical energy. This technology seems promising, especially for automotive applications. Fuel cells generally comprise a series of individual elements, each consisting essentially of a cathode and an anode separated by a polymer membrane that transports ions from the anode to the cathode. [0003] As fuel, hydrogen can be produced either with a hydrogen supply or, if necessary, close to the fuel cell via a reformer itself supplied with, for example, hydrocarbons. As for the oxidant, either the fuel cell is supplied with compressed air and the excess gas in which the proportion of oxygen has been reduced is discharged downstream of the fuel cell, or the fuel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04H01M8/00B60L11/18
CPCH01M8/04164H01M8/04179H01M8/04253H01M8/04291H01M8/0491H01M2008/1095H01M2250/20H01M8/04395Y02T90/40Y02E60/50H01M8/04303H01M8/04228H01M8/10H01M8/04H01M8/04302H01M8/04223
Inventor G·帕加内利
Owner SOCIETE DE TECH MICHELIN
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