Research On The Forming Technology And Equipment For PEMFC Stainless Steel Bipolar Plates

Due to the shortage of traditional energy resources and the impact of global warming and other issues,new clean energy has become one of the research hotspots.Proton exchange membrane fuel cells have become one of the recognized clean energy sources because of their abundant and reproducible reaction gas reserves,high reaction efficiency,and no pollution,which has aroused widespread concern.Metal bipolar plates are one of the important components of fuel cells.In order to find a cost-effective preparation method,the research on the stamping process and forming equipment of metal bipolar plates has become the primary problem to be solved in recent years.In this study,the flow channel profile structure of metal bipolar plates was designed and the effect of different flow channel profile dimensions on the stamping quality of metal bipolar plates was simulated and analyzed.Based on the existing bipolar plate forming process and equipment,the functional requirements,structural characteristics,and design requirements of the special molds and presses for metal bipolar plates were proposed,which provide reference for the preparation of metal bipolar plates.The research contents as follows:(1)Comparing the advantages and disadvantages of different material bipolar plate progressing,the performance of the metal is basically satisfied and the cost is low,the forming method is simple,the stainless steel plate has been selected as the bipolar plate material,and the bipolar plate outline structure has been designed.(2)According to the wrinkle defect analysis theory of sheet metal stamping,the wrinkle defect of stamping forming of metal bipolar plate has been analyzed,and the critical condition of wrinkling was obtained under bipolar plate with or without blank holder force,in order to provide theoretical guidance for the stamping of metal bipolar plate.(3)Comparing the advantages and disadvantages of different field structures,and designing a single S-shaped bipolar plate flow channel structure.The finite element model was established to analyze the stamping forming of metal bipolar plates,and the FLD of different flow channel profiles were obtained.Thesis analyzes the effect of metal bipolar plates size on forming quality.(4)Comparing three types of hydraulic press,framed hydraulic press was chosen as bipolar plates press due to its better strength and cheaper costing.Then design the structure of framed hydraulic press for manufacturing bipolar plates.Combined with the numerical simulation results,the structure size of the bipolar plate flow channel was determined.Combined with the requirements of metal bipolar plate stamping process,the mold structure was is designed and the mold was processed for experiments.(5)After assembling stamping die,some experiments on die and fuselage has been performed to prove the correctness of theoretical analysis and numerical simulation results,and rationality of forming mold and equipment structure.