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作为质子交换膜燃料电池的关键元件,双极板具备支持电池堆、隔挡燃料与氧化剂、汇集并传递电流、疏导反应气体与产物水的流通以及交换热力等功用,因此双极板的优劣将决定电池的整体性能。不锈钢的抗压能力强、传热好、成型工艺简单,是首选的双极板材料,但其耐化学性差且表层钝化膜导致电池功率衰减严重,故须在不锈钢表面添加改性涂层。
As a key element of proton exchange membrane fuel cell, the bipolar plate has the functions of supporting the cell stack, blocking fuel and oxidant, pooling and transferring current, diverting the flow of reactant gas and product water and exchanging heat, etc. Therefore, the advantages and disadvantages of the bipolar plate Will determine the overall performance of the battery. Stainless steel has strong compressive ability, good heat transfer and simple forming process. It is the preferred bipolar plate material. However, its chemical resistance is poor and the surface passivation film causes serious deterioration of battery power. Therefore, it is necessary to add a modified coating on the surface of stainless steel.