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    SHUTDOWN OPERATIONS FOR AN UNSEALED CATHODE FUEL CELL SYSTEM
    1.
    发明申请
    SHUTDOWN OPERATIONS FOR AN UNSEALED CATHODE FUEL CELL SYSTEM 审中-公开
    用于无负载CATHODE燃料电池系统的关闭操作

    公开(公告)号：US20090263679A1

    公开(公告)日：2009-10-22

    申请号：US12103939

    申请日：2008-04-16

    申请人： Gary M. Robb ,  Hubert A. Gasteiger ,  Balasubramanian Lakshmanan ,  Paul Taichiang Yu ,  Steven G. Goebel ,  Frederick T. Wagner

    发明人： Gary M. Robb ,  Hubert A. Gasteiger ,  Balasubramanian Lakshmanan ,  Paul Taichiang Yu ,  Steven G. Goebel ,  Frederick T. Wagner

    IPC分类号： H01M8/04

    CPC分类号： H01M8/04231 ,  H01M8/04559 ,  H01M8/04955

    摘要： Processes to shut down a fuel cell system are described. In one implementation (300), a load (215) is cyclically engaged and disengaged across a fuel cell stack (205) so as to deplete the fuel available to the system's fuel cells (205). Voltage and/or current thresholds may be used to determine when to engage and disengage the load (215) and when to terminate the shutdown operation. In another implementation (500), a variable load (405) is engaged and adjusted so as to deplete the fuel available to the system's fuel cells (205). As before, voltage and/or current thresholds may be used to determine when to adjust the load (405) and when to terminate the shutdown process. In still another implementation, a load (215 or 405) may be periodically engaged and disengaged during some portion of the shutdown process and engaged but adjusted during other portions of the shutdown process.

    摘要翻译： 描述关闭燃料电池系统的过程。 在一个实施方案（300）中，负载（215）在燃料电池堆（205）周期性地接合和分离，从而消耗可用于系统燃料电池（205）的燃料。 可以使用电压和/或电流阈值来确定何时接合和解除负载（215）以及何时终止关机操作。 在另一实施方案（500）中，接合和调节可变负载（405）以便耗尽系统燃料电池（205）可用的燃料。 如前所述，可以使用电压和/或电流阈值来确定何时调整负载（405）以及何时终止关机过程。 在另一个实施方案中，在关闭过程的某些部分期间，负载（215或405）可以周期性地接合和分离，并且在关闭过程的其他部分期间被接合但被调整。

    Life extension of PEM fuel cell using startup method
    9.
    发明授权
    Life extension of PEM fuel cell using startup method 有权
    使用启动方法延长PEM燃料电池寿命

    公开(公告)号：US08828616B2

    公开(公告)日：2014-09-09

    申请号：US12262785

    申请日：2008-10-31

    申请人： Clark G. Hochgraf ,  Paul Taichiang Yu ,  Frederick T. Wagner ,  Robert S. Foley

    发明人： Clark G. Hochgraf ,  Paul Taichiang Yu ,  Frederick T. Wagner ,  Robert S. Foley

    IPC分类号： H01M8/04

    CPC分类号： H01M8/04753 ,  H01M8/04223 ,  H01M8/04225 ,  H01M8/0494 ,  H01M2250/20 ,  Y02E60/50 ,  Y02T90/32

    摘要： A fuel cell system that employs a technique for reducing or significantly eliminating the MEA degradation that occurs as a result of the hydrogen-air front in the anode flow channels at system start-up. After system shut-down, any hydrogen remaining within the anode flow channels will be quickly reacted or diffused. At the next start-up, a switch is closed to provide a dead short across the positive and negative terminals of the fuel cell stack as hydrogen is being introduced into the anode flow channels. The existing air in the cathode flow channels reacts with the hydrogen being introduced across the membrane in the normal fuel cell reaction. However, the short prevents a voltage potential across the membrane.

    摘要翻译： 一种燃料电池系统，其采用用于减少或显着消除在系统启动时由于阳极流动通道中的氢空气前沿而发生的MEA劣化的技术。 系统关闭后，残留在阳极流动通道内的任何氢气将迅速反应或扩散。 在下一次启动时，当氢被引入阳极流动通道时，开关闭合以在燃料电池堆的正极和负极端子之间提供死点。 阴极流动通道中的现有空气与在正常燃料电池反应中跨过膜引入的氢反应。 然而，短路防止跨膜的电压。

    LIFE EXTENSION OF PEM FUEL CELL USING STARTUP METHOD
    10.
    发明申请
    LIFE EXTENSION OF PEM FUEL CELL USING STARTUP METHOD 有权
    使用启动方法延长PEM燃料电池

    公开(公告)号：US20100112382A1

    公开(公告)日：2010-05-06

    申请号：US12262785

    申请日：2008-10-31

    申请人： Clark G. Hochgraf ,  Paul Taichiang Yu ,  Frederick T. Wagner ,  Robert S. Foley

    发明人： Clark G. Hochgraf ,  Paul Taichiang Yu ,  Frederick T. Wagner ,  Robert S. Foley

    IPC分类号： H01M8/04 ,  H01M8/02

    CPC分类号： H01M8/04753 ,  H01M8/04223 ,  H01M8/04225 ,  H01M8/0494 ,  H01M2250/20 ,  Y02E60/50 ,  Y02T90/32

    摘要： A fuel cell system that employs a technique for reducing or significantly eliminating the MEA degradation that occurs as a result of the hydrogen-air front in the anode flow channels at system start-up. After system shut-down, any hydrogen remaining within the anode flow channels will be quickly reacted or diffused. At the next start-up, a switch is closed to provide a dead short across the positive and negative terminals of the fuel cell stack as hydrogen is being introduced into the anode flow channels. The existing air in the cathode flow channels reacts with the hydrogen being introduced across the membrane in the normal fuel cell reaction. However, the short prevents a voltage potential across the membrane.

    摘要翻译： 一种燃料电池系统，其采用用于减少或显着消除在系统启动时由于阳极流动通道中的氢空气前沿而发生的MEA劣化的技术。 系统关闭后，残留在阳极流动通道内的任何氢气将迅速反应或扩散。 在下一次启动时，当氢被引入阳极流动通道时，开关闭合以在燃料电池堆的正极和负极端子之间提供死点。 阴极流动通道中的现有空气与在正常燃料电池反应中跨过膜引入的氢反应。 然而，短路防止跨膜的电压。