Fuel cell system

The fuel cell system addresses catalyst elution by controlling the stoichiometric ratio of cathode gas and power generation state post-recovery, ensuring stable catalyst performance and longevity.

DE102020100966B4Active Publication Date: 2026-05-28TOYOTA JIDOSHA KK
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Patent Information

Application Number
DE102020100966
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Priority Date
2019-01-31
Filing Date
2020-01-16
Publication Date
2026-05-28
Estimated Expiration
2040-01-16

AI Technical Summary

Technical Problem

The elution of a fuel cell catalyst occurs when the voltage is controlled to be high immediately after recovery processing, leading to performance degradation.

Method used

A fuel cell system that includes a control unit to manage the stoichiometric ratio of cathode gas and place the fuel cell into a power generation paused state or idle operating state after recovery processing, maintaining a lower stoichiometric ratio to prevent voltage rise and catalyst elution.

Benefits of technology

Prevents catalyst elution by controlling the fuel cell's voltage and stoichiometric ratio, thereby maintaining catalyst performance and extending its operational lifespan.

✦ Generated by Eureka AI based on patent content.

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Abstract

Fuel cell system (1) comprising: a fuel cell (4); a supply device (10) configured to supply a cathode gas to the fuel cell (4); and a control unit (3) configured to perform recovery processing to cause a catalyst of the fuel cell (4) to recover from a degradation in performance by lowering an output voltage of the fuel cell (4), wherein the control unit (3) is configured to, when the executed recovery processing is complete, control the supply device (10) to place the fuel cell (4) into a power generation interruption state while making a stoichiometric ratio of cathode gas lower than a stoichiometric ratio of cathode gas in a normal operating state, which is a state prior to the execution of the recovery processing characterized by the fact that the control unit (3) is configured to i) to put the fuel cell (4) into the power generation interruption state while making the stoichiometric ratio of the cathode gas lower than the stoichiometric ratio of the cathode gas in the normal operating state when an output request to the fuel cell (4) at a time when recovery processing is complete is less than a first threshold, and ii) to put the fuel cell (4) into an idle operating state while making a stoichiometric ratio of cathode gas lower than the stoichiometric ratio of cathode gas in the normal operating state when the output demand at the time when recovery processing is complete is equal to or greater than the first threshold and less than a second threshold which is greater than the first threshold.
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Citation Information

Patent Citations

  • Fuel cell system

    JP2008130402A

  • Fuel cell system and method

    JP2014212018A

  • JP002014212018A