Fuel cell system with humidification control

H - Electricity – 01 – M

Patent

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Details

H01M 8/04 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2640047

A fuel cell system has an oxidizer gas flow rate adjuster (5) that adjusts a flow rate of oxidizer gas of the fuel cell stack (1) and a controller (10) that determines a humidity state in the fuel cell stack (1). The controller (10) has an average cell voltage calculator (13) that calculates an average cell voltage, a minimum cell voltage calculator (14) that calculates a minimum cell value, a voltage difference calculator (15) that calculates a voltage difference between the average cell voltage and the minimum cell voltage, and a voltage comparator (16) that compares the absolute voltage difference with a preset value. The flow rate of the oxidizer gas is changed based on a comparison between the absolute voltage difference and the preset value, and then the humidity state in the fuel cell stack (1) is determined based on a change in the absolute voltage difference.

L~invention concerne un système de pile à combustible comportant un dispositif de réglage (5) de débit de gaz oxydant, servant à ajuster le débit de gaz oxydant d~un empilement (1) de piles à combustible, et un dispositif de régulation (10) servant à déterminer un état d~humidité dans ledit empilement (1). Le dispositif de régulation (10) comprend un calculateur (13) de tension moyennede pile servant à calculer la tension moyenne des piles, un calculateur (14) de tension minimum de pile servant à calculer une valeur minimum des piles, un calculateur (15) de différence de tension servant à calculer une différence de tension entre la tension de pile moyenne et la tension de pile minimum, et enfin un comparateur de tension (16) chargé de comparer la valeur absolue de la différence de tension à une valeur de consigne. Le débit de gaz oxydant est modifié en fonction du résultat de la comparaison entre la différence de tension absolue et la valeur de consigne, puis l~état d~humidité dans l~empilement (1) de piles à combustible est déterminé à partir d~une modification de la différence de tension absolue.

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