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1. 发明申请

WO2005121917A1 FLOW CONTROL APPARATUS AND METHOD FOR FUEL CELL FLOW FIELDS 审中-公开
标题翻译：流量控制装置和燃料电池流场的方法
公开(公告)号：WO2005121917A1
公开(公告)日：2005-12-22
申请号：PCT/CA2005/000913
申请日：2005-06-10
申请人： NATIONAL RESEARCH COUNCIL OF CANADA , WILKINSON, David, P. , RAHBARI, Roya , ZIMMERMAN, Joerg , BLANCO, Mauricio
发明人： WILKINSON, David, P. , RAHBARI, Roya , ZIMMERMAN, Joerg , BLANCO, Mauricio
IPC分类号： G05D7/00
CPC分类号： H01M8/0263 , G05D7/0694 , H01M8/0258 , H01M8/04007 , H01M8/04089 , H01M8/0432 , H01M8/0444 , H01M8/04559 , H01M8/04619 , H01M8/04753
摘要： An adjustable flow field and flow regulation method for an electrochemical device such as a fuel cell is described. The flow field preferably includes a plurality of flow paths between an inlet and an outlet and a plurality of microvalves for regulating fluid flow through the flow paths in response to changes in the operating states of the fuel cell, such as changes in power output or temperature. For example, adjustment of the microvalves may restrict the number of flow paths through which fluid is flowing to alter the effective active area and current density of the flow field. The valves may be selectively opened or closed, either entirely or partially, to maintain a minimum pressure drop between the inlet and outlet. Alternatively or additionally, adjustment of the valves may alter the direction of fluid flow through at least some of the flow paths. The invention improves the stability of the fuel cell in low power and low reactant stoichiometry operating states without significantly increasing the complexity of the system or increasing parasitic loads. For example, the invention may improve water management in low power modes and avoid related performance problems such as low current density failures and voltage oscillations. The invention may also help reduce the cost and complexity of the system power electronics.
摘要翻译：描述了用于诸如燃料电池的电化学装置的可调节流场和流量调节方法。流场优选地包括在入口和出口之间的多个流动路径和用于响应于燃料电池的操作状态的变化（例如功率输出或温度的变化）调节流过流动路径的流体的多个微型阀。例如，微阀的调节可以限制流体流过的流动路径的数量，以改变流场的有效有效面积和电流密度。阀可以选择性地打开或关闭，完全或部分地，以保持入口和出口之间的最小压降。或者或另外，阀的调节可以改变通过至少一些流动路径的流体流动的方向。本发明在低功率和低反应物化学计量运行状态下提高燃料电池的稳定性，而不显着增加系统的复杂性或增加寄生负载。例如，本发明可以改善低功率模式下的水管理，并避免诸如低电流密度故障和电压振荡等相关性能问题。本发明还可以帮助降低系统电力电子设备的成本和复杂性。

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