螺杆集成方式对燃料电池电化学性能的影响

Experimental Study of Clamping Force to Electromechanical Performance of Proton Exchange Membrane Fuel Cell Stack

摘要:

以15片单体电池组成燃料电池电堆为研究对象，进行电化学性能、交流阻抗与内部接触压力分布的试验测试.系统全面地研究了螺杆集成方式燃料电池电堆电化学性能的影响,深入剖析集成力大小和加载方式对燃料电池电堆内欧姆交流阻抗和内部接触压力分布的作用机制，螺杆集成方式不利于电堆电化学性能的高功率输出.得出电堆内压力分布均匀性和燃料电池电化学性能的提高不应仅局限于集成力大小，更重要的是均匀的集成力加载方式，以及配合端板结构进行优化和匹配.

关键词:燃料电池质子交换膜; 集成力; 欧姆阻抗; 压力分布; 电化学性能

Abstract:

This study is mainly on electrochemical performance testing, electrochemical impedance spectroscopy (EIS) testing and contact pressure distribution testing with a fuel cell stack of 15 cells, systematically study the influence of assembly force to the electrochemical performance of fuel cell stack. Experiment results show that the assembly force and loading type have influence on the internal ohmic impedance and pressure distribution, and bolt assembly is negative to the high power output of fuel cell performance. The results indicate improvement of fuel cell performance and uniformity of contact pressure should non only consider the assembly force, but also more attention to the uniform loading type and optimization of end plate structure.

Key words:fuel cell proton exchange membrane; assembly force; ohmic impedance; pressure distribution; electrochemical performance