微型燃料电池304不锈钢双极板累积成形研究

Accumulative forming for 304 stainless steel bipolar plate of micro fuel cell

微质子交换膜燃料电池是新型绿色能源的优选,双极板是其关键部件,但是微尺度下的双极板精密成形很困难,对现有成形方法提出了挑战。针对304不锈钢双极板提出了累积成形方法,即采用和流道形状对应的微模头对金属板料进行下压,按照流道走向和成形轨迹对板料进行局部变形和挤压的累积作用,达到实现整个双极板成形的目的。同时进行了累积成形的成形过程研究,分析了直流道形状的304不锈钢双极板的成形规律,获得了不同垂直下压量情况下的板厚变化和流道深度回弹率的影响规律。

Micro proton exchange membrane fuel cell has the potential to become a new type of green energy, whose key component is bipolar plate. High precision forming for bipolar plate under microscale is difficult, which challenges the existing forming methods. Accumulation forming method on 304 stainless steel bipolar plate was put forward, which is to employ the micro-punch corresponding to the form of channel to press the sheet metaland then form the bipolar plate under accumulation effects of local deformation and extrusion according to the channel direction and forming path. Meanwhile, accumulative forming process was studied and forming rule for 304 stainless steel with direct channel was analyzed, then the influence laws of different vertical press amounts on thickness change and flow depth springhack rate were obtained.