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首页> 外文会议>11th fuel cell science, engineering, and technology conference 2013 >PEMFC STACK ACTIVATION THROUGH THERMAL MANAGEMENT
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PEMFC STACK ACTIVATION THROUGH THERMAL MANAGEMENT

机译：通过热管理进行PEMFC堆垛活化

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Activation of PEM fuel cell stack is an important factor in setting peak power of stack before its steady operations. Several methods of activation for larger capacity stacks involve operation of the stacks initially at low voltages under highly humidified conditions and at high temperatures. This is expected to improve proton conductivity of the membrane. For large area cells this method can create hot spots due to high current and non-uniform temperature distribution. Hence, an alternative approach for activating PEMFC stack at low current for vehicular applications has been investigated in this study. Conventional stack activation requires continuous supply of coolant. However for vehicular applications, a closed loop thermal management system is required. During the course of developing such a close loop thermal management system for transportation application, we have identified that the same system can be used in activating a PEM fuel cell stack. In the present study a 5kW PEMFC stack, operating on dry reactants, has been activated using a closed loop thermal management system. The activation has been carried out over a period of 620 minutes with 6 start/stop cycles. Through the start stop cycles the power delivered by the stack steadily increased from 2.5kW, to 5kW. Further, heat developed inside the fuel cell, as removed by the coolant water, has been studied and there is a proportional increase in the overall heat removed by the coolant to the total power delivered by the fuel cell. The start stop cycles are regulated based on the single cell voltages and stack temperature. Each cycle is stopped when the stack temperature reaches a set temperature of 50℃. The advantage of this procedure is that it will result in long life of the fuel cell stack, uniform membrane equilibration, and will avert hot spot generation in the electrodes at low cell potential.
机译：PEM燃料电池堆的激活是在稳定运行之前设置堆的峰值功率的重要因素。用于大容量电池堆的几种激活方法包括首先在高湿度条件和高温下在低电压下运行电池堆。预期这将改善膜的质子传导性。对于大面积电池，由于高电流和温度分布不均匀，此方法可能会产生热点。因此，在这项研究中，研究了一种用于车辆的低电流激活PEMFC电池组的替代方法。传统的堆激活需要持续供应冷却液。然而，对于车辆应用，需要闭环热管理系统。在开发这种用于交通运输应用的闭环热管理系统的过程中，我们已经确定可以将同一系统用于激活PEM燃料电池堆。在本研究中，使用干燥的反应物运行的5kW PEMFC堆已使用闭环热管理系统激活。激活已在620分钟的时间内进行了6个启动/停止周期。通过启动停止循环，烟囱提供的功率从2.5kW稳定增加到5kW。此外，已经研究了由冷却剂水去除的在燃料电池内部产生的热量，并且由冷却剂去除的总热量与由燃料电池传递的总功率成比例地增加。根据单电池电压和电池组温度调节启动停止周期。当烟囱温度达到设定温度50℃时，将停止每个循环。该程序的优点在于，它将导致燃料电池堆的使用寿命长，膜平衡均匀，并避免在低电池电势下电极中产生热点。

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