Research On Stamping And Forming Technology Of Metal Bipolar Plate Micro-channel For Fuel Cell

With the low-carbon and environmental protection concept of green travel promoted by the state and the government,and in the context of "carbon peaking and carbon neutrality",traditional fossil energy has been gradually replaced by clean energy.Green energy of energy has shown broad application prospects in various fields such as industry,transportation,and construction,and major companies have also entered the field of hydrogen energy.The application of proton exchange membrane fuel cells in the automotive industry has become the mainstream development area of current car companies.The performance matching of hydrogen fuel cell vehicles has further accelerated the rapid transformation and upgrading of automotive products,and the life and safety of automotive hydrogen fuel cells have also become the focus of current research.Bipolar plate is an indispensable part of hydrogen fuel cell,and it occupies a large part in the quality and cost of the stack,and plays an important role in fuel transportation,energy transfer,and current conduction.determines the performance of the battery.Metal bipolar plates have the advantages of light weight,good ductility,and strong electrical and thermal conductivity.At the same time,the efficient and fast stamping method will also greatly reduce the production cycle and cost of products.It has become the mainstream research direction of major hydrogen fuel cell vehicle companies.This paper focuses on the design of the metal bipolar plate micro-channel for hydrogen fuel cells and the optimization of the stamping process parameters.The main research contents include:The current research status of metal bipolar plates is expounded,and the structure design and forming methods and processes of different watershed fields are analyzed.Based on the theory of micro-stamping,the strain state and thickness distribution of metal bipolar plates in the process of stamping deformation are studied.(2)Aiming at 0.1mm stainless steel 316 metal bipolar plate,a double Sshaped watershed field is proposed.Through the simulation analysis of Dynaform software,the influence of various flow channel sizes on the forming quality of the metal bipolar plate is studied,and the flow channel structure of the bipolar plate is realized.The influence of forming quality can realize the optimization of bipolar plate flow channel structure design.Through simulation,it is found that when the bipolar plate runner height is 0.4mm,the runner opening angle is 20 °,the rib width is1.0mm,the groove width is 1.0mm,and the runner fillet is 0.15 mm,better forming quality can be obtained.When the die gap is 0.15 mm,the thinning rate of the bipolar plate is reduced from the original 31% to 24%,which effectively avoids cracking during the stamping and forming of the thin plate.(3)For the stamping and forming simulation of metal bipolar plates,research on the formability of stamping parts by different process parameters,through orthogonal test design and result analysis,the test results show that the speed of die stamping has the greatest influence on the thinning rate of metal bipolar plates,the value of blank holder load can effectively improve the surface wrinkling of metal bipolar plates.When the die punching speed is500mm/s,the applied sheet blank holder load is 40 KN,and the friction coefficient is set to 0.12,the optimal forming quality of the bipolar plate can be obtained.(4)Finally,through the selection of the bipolar plate stamping equipment,according to the bipolar plate forming process requirements,the corresponding precision mold design and processing are carried out.It is verified by the bipolar plate stamping forming test that the size and structure design of the metal bipolar plate and the optimized stamping process parameters can obtain better metal bipolar plate stamping parts.