A fuel cell reversal event is diagnosed by integrating current density via a controller in response to determine an accumulated charge density. The controller executes a control action when the accumulated charge density exceeds a threshold, including recording a diagnostic code indicative of event severity. The control action may include continuing stack operation at reduced power capability when the accumulated charge density exceeds a first threshold and shutting off the stack when the accumulated charge density exceeds a higher second threshold. The event may be detected by calculating a voltage difference between an average and a minimum cell voltage, and then determining if the difference exceeds a voltage difference threshold. The charge density thresholds may be adjusted based on age, state of health, and/or temperature of the fuel cell or stack. A fuel cell system includes the stack and controller.


    Access

    Download


    Export, share and cite



    Title :

    Cell reversal diagnostics for a fuel cell stack


    Contributors:

    Publication date :

    2021-04-06


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY




    FUEL CELL STACK DIAGNOSTICS USING CROWDSOURCING FOR CONNECTED FUEL CELL VEHICLE

    CHENG MING / JOHRI RAJIT / SANDERSON JR WILLIAM F et al. | European Patent Office | 2023

    Free access

    FUEL CELL STACK AND VEHICLE WITH A FUEL CELL STACK

    JUNG CHANJUNG | European Patent Office | 2018

    Free access

    FUEL CELL STACK

    NAITO HIDEHARU / SATO MASAHIRO / MITANI MANABU | European Patent Office | 2020

    Free access

    Fuel cell stack

    NAITO HIDEHARU / SATO MASAHIRO / MITANI MANABU | European Patent Office | 2022

    Free access