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    • 4. 发明公开
    • Polymer electrolyte fuel cell
    • Polymer-Elektrolyt Brennstoffzelle
    • EP1298745A3
    • 2006-10-04
    • EP02256655.8
    • 2002-09-25
    • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    • Yoshida, AkihikoYamamoto, MasaoNiikura, JunjiTakebe, YasuoSakai, OsamuUchida, Makoto
    • H01M4/86H01M8/10H01M8/04
    • H01M4/8821H01M4/8605H01M4/8642H01M4/8652H01M4/8657H01M4/8828H01M4/92H01M4/96H01M8/04089H01M8/1004
    • A porous supporting carbon body of a gas diffusion layer is provided with a larger number of smaller pores at its catalyst layer side and a smaller number of larger pores at the other side, particularly with an appropriate distribution of finer mesh at its catalyst layer side and coarser mesh at the other side. Thereby, a high performance polymer electrolyte fuel cell can be obtained in which water generated at the catalyst layer is quickly sucked out to the gas diffusion layer, and is evaporated at the gas diffusion layer to be effectively exhausted to outside the fuel cell, so that excessive water can be prevented from retaining in the gas diffusion electrode, with the polymer electrolyte membrane being maintained at an appropriately wet condition.
      Further, a gas diffusion layer is provided with an electrically conductive polymer-containing layer comprising carbon particles and a polymer material. In it, a combination of two kinds of carbon particles having different amounts of acidic function group is used in a manner that the weight ratio of one kind having a larger acidic function group, relative to the other kind, increases from one end of the gas diffusion layer, corresponding to the inlet of a gas flow channel, to the other end. Thereby, the water permeating function at the surface of the gas diffusion layer can be so adjusted that the inside of the MEA is maintained at an appropriately wet condition, while excessive water is quickly exhausted to outside of the fuel cell together with e.g. the reactive gas. This can also be achieved by using a combination of two kinds of polymer materials in the electrically conductive polymer-containing layer in a manner that the two kinds have either different degrees of crystallinity or different coefficients of moisture permeability, so that the degrees of crystallinity decreases and the coefficients of moisture permeability increases from the one end to the other end of the gas diffusion layer.
    • 气体扩散层的多孔支撑碳体在其催化剂层侧具有更多的较小的孔,另一侧具有较小的较大的孔,特别是在其催化剂层侧具有适当的细网分布, 另一侧较粗的网格。 由此,能够得到将催化剂层中产生的水快速吸入气体扩散层的高性能聚合物电解质型燃料电池,在气体扩散层蒸发而被有效地排出到燃料电池外部, 可以防止过多的水滞留在气体扩散电极中,使聚合物电解质膜保持在适当的湿润状态。 此外,气体扩散层设置有包含碳颗粒和聚合物材料的导电聚合物含有层。 其中,使用具有不同量的酸性官能团的两种碳颗粒的组合,使得具有较大酸性官能团的一种相对于另一种类型的重量比从气体的一端增加 对应于气体流路的入口的扩散层到达另一端。 由此,可以调节气体扩散层表面的透水功能,使得MEA的内部保持在适当的湿润状态,同时过量的水被快速地排出到燃料电池外部。 反应气体。 这也可以通过在含导电聚合物的层中使用两种聚合物材料的组合来实现,其中两种具有不同的结晶度或不同的透湿系数,使得结晶度降低 并且透湿系数从气体扩散层的一端到另一端增加。
    • 7. 发明公开
    • Fuel cell stack and manufacturing method thereof
    • Brennstoffzellenstapel和Verfahren zu seiner Herstellung
    • EP1511098A2
    • 2005-03-02
    • EP04020302.8
    • 2004-08-26
    • Nissan Motor Co., Ltd.
    • Takekawa, Toshihiro
    • H01M4/04H01M8/24
    • H01M4/8821H01M4/8807H01M4/8817H01M8/0234H01M8/0245H01M8/247Y02P70/56Y10T29/49115
    • A fuel cell stack constituted by fastening a laminated cell, is disclosed. The electrode of the cell has a catalyst electrode layer and a porous gas diffusion layer and supporting a polymer electrolyte membrane (1) from both sides. A separator (3) of the cell has a gas passage (6, 7) which supplies fuel gas or oxidizer gas to the gas diffusion layer. The gas diffusion layer (2b) is constituted such that when a load is applied and removed in the lamination direction of the cell, an amount of change in a thickness of the gas diffusion layer in a non-loaded state before and after the load is applied falls to or below a predetermined value. The gas diffusion layer (2b) is manufactured by repeating a cycle of applying and removing a load on the gas diffusion layer in the lamination direction of the cell before laminating the cell. The cycle is repeated until an amount of change in a thickness of the gas diffusion layer in a non-loaded state before and after the load is applied falls to or below a predetermined value. The gas diffusion layer (2b) is prevented from swelling into the gas passage.
    • 公开了一种通过紧固层叠电池构成的燃料电池堆。 电池的电极具有催化剂电极层和多孔气体扩散层,并且从两侧支撑聚合物电解质膜(1)。 电池的隔膜(3)具有向气体扩散层供给燃料气体或氧化剂气体的气体通路(6,7)。 气体扩散层(2b)构成为,当在电池单元的层叠方向上施加负载并移除负载时,在负载前后的无负载状态下的气体扩散层的厚度变化量为 施加下降到或低于预定值。 气体扩散层(2b)通过在层叠电池之前重复在电池的层叠方向上施加和除去气体扩散层上的负载的循环来制造。 重复该循环,直到在施加负载之前和之后的无负载状态下的气体扩散层的厚度的变化量达到或低于预定值。 防止气体扩散层(2b)膨胀到气体通道中。