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1. EP1858102 - FUEL CELL SYSTEM

Office European Patent Office
Application Number 06714945
Application Date 22.02.2006
Publication Number 1858102
Publication Date 21.11.2007
Publication Kind B1
IPC
H01M 8/04
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
8Fuel cells; Manufacture thereof
04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
H01M 8/10
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
8Fuel cells; Manufacture thereof
10Fuel cells with solid electrolytes
CPC
H01M 8/04126
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
8Fuel cells; Manufacture thereof
04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
04082Arrangements for control of reactant parameters, e.g. pressure or concentration
04089of gaseous reactants
04119with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
04126Humidifying
H01M 8/04223
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
8Fuel cells; Manufacture thereof
04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
04223during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
H01M 8/04253
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
8Fuel cells; Manufacture thereof
04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
04223during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
04253Means for solving freezing problems
H01M 8/04291
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
8Fuel cells; Manufacture thereof
04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
04291Arrangements for managing water in solid electrolyte fuel cell systems
H01M 8/04298
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
8Fuel cells; Manufacture thereof
04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
04298Processes for controlling fuel cells or fuel cell systems
H01M 8/04529
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
8Fuel cells; Manufacture thereof
04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
04298Processes for controlling fuel cells or fuel cell systems
04313characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
04492Humidity; Ambient humidity; Water content
04529of the electrolyte
Applicants TOYOTA MOTOR CO LTD
Inventors KITAMURA NOBUYUKI
Designated States
Priority Data 2005065449 09.03.2005 JP
2006303825 22.02.2006 JP
Title
(DE) BRENNSTOFFZELLENSYSTEM
(EN) FUEL CELL SYSTEM
(FR) SYSTEME DE PILES A COMBUSTIBLE
Abstract
(EN)
In a fuel cell system including a stack of polymer electrolyte fuel cells, the wet state of electrolyte membranes in the fuel cell stack is detected according to a variation in measurement value of an alternating current impedance (AC impedance) of the fuel cell stack. In an adequate level of water content of the electrolyte membranes, the measurement value of the AC impedance is substantially constant and has a very little variation. In an excess level of water content of the electrolyte membranes, the measurement value of the AC impedance has a significant variation. The AC impedance of the fuel cell stack is determinable by frequency analysis of high-frequency noise generated by an inverter included in the fuel cell system.

(FR)
Dans un système de piles à combustible comprenant une pile à combustible de type polymère à l’état solide, l’état humide du film électrolytique de l’empilement de piles à combustible est évalué en fonction des irrégularités de l’impédance a.c de l’empilement de piles à combustible. Lorsque, par exemple, la teneur en humidité du film électrolytique est appropriée, la valeur de l’impédance a.c est quasi constante et présente des irrégularités mineures. De plus, lorsque la teneur en humidité du film électrolytique est trop élevée, la valeur de l’impédance a.c change considérablement. Il est à noter que l’impédance a.c de l’empilement de piles à combustible est mesurée en analysant la fréquence du bruit haute-fréquence généré par l’onduleur disposé dans le système de piles à combustible.

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