均温板在质子交换膜燃料电池堆热管理中的应用

Application of Vapor Chamber in the Thermal Management of Proton Exchange Membrane Fuel Cell Stack

过低或过高的工作温度以及过大的温度变化均会影响质子交换膜燃料电池的输出性能和耐久性。有效的热管理是保证质子交换膜燃料电池稳定高效输出的关键因素。本研究将厚度为1.5 mm的均温板作为散热结构应用在质子交换膜燃料电池堆的热管理中,通过安装在5块单电池阴极石墨板上的80个热电偶获取电池内部表面温度,探究了不同负载电流工况下电池堆的温度分布特性。实验发现在0~8 A的加载过程中,各单电池内阴极侧区域最大温差均小于1.0℃,仅在进气口附近有局部温度波动。在相同工况下运行时,应用均温板的电池堆的温度分布均匀性也更优于普通水冷电池堆。

Too low or too high operating temperature and excessive temperature fluctuations will adversely affect the output performance and durability of proton exchange membrane fuel cells.Therefore,effective thermal management is the essential to the stable and efficient output of proton exchange membrane fuel cells.In this study,a 1.5 mm-thick vapor chamber was used as a heat dissipation structure in the thermal management of a proton exchange membrane fuel cell stack,and 80 thermocouples were installed on a cathode graphite plate with 5 single cells to obtain the internal surface temperature of cells,so as to explore the temperature distribution characteristics of the stack under different load currents.It's found that,during the loading process of 0~8 A,the maximum temperature diffe-rence of the cathodic side within each single cell is less than 1.0℃,and local temperature fluctuation only occurs at inlet ports.In addition,the temperature distribution uniformity of the stack with vapor chamber is better than that of the ordinary water-cooled stack under the same operating condition.