Design And Finite Element Simulation Of Sealing Rubber Composite For Pemfc

With the introduction of the concept of "carbon neutrality",for the sustainable development of human society,fossil fuels will eventually be replaced.The only product of hydrogen energy is water,which has high combustion calorific value and high energy density.It is the most ideal clean energy source.At present,one of its main applications is the PEMFC.This battery can directly convert chemical energy into electrical energy.Besides,it can generate electricity with high efficiency but no pollution and no noise.As a reslut,the durability and reliability of PEMFC are key issues in the commercial application process.In order to extend the life of PEMFC,the industry and academia have made a lot of attempts in the durability and reliability of membrane electrodes and bipolar plates.However,compared with membrane electrode and bipolar plate,the sealing material in PEMFC has been neglected in the current research field.Although the sealing material does not participate in the electrochemical reaction of the battery,it is also one of the key factors that determine the durability and reliability of PEMFC Sealing failure and material migration accumulation lead to problems such as gas cross mixing,contaminated membranes,which could reduce the performance of battery performance and decrease the life.Therefore,suitable materials should be selected and the seals should be effectively designed to ensure the reliable performance of the PEMFC during the entire design life.On the other hand,since the cost of the PEMFC actually manufacturing assembly is high,the finite element simulation method can greatly shorten the product development cycle and save costs.Based on the above research background,the main research works of this article are as follows:(1)At first,We used FT-IR,DSC,TGA,SEM,EDS and other rubber reverse engineering test methods to analyze the sample of sealant for PEMFC,The results show that the sample is an EPDM composite material and uses a non-sulfur vulcanization system.On this basis,the market liquid EPDM model is investigated,and the lion chemical T65 is used as a base glue,and the peroxide TMCH is a vulcanizing agent design formulation to meet the requirements of low temperature vulcanization.The effects of talc powder,organic montmaryine,graphene filled film on sealing materials showed that the OMMT-1 formulation filled with organic Swarm was basically satisfied with foreign indicators.(2)Then,the experimental data of OMMT-1 sealing composites under three loading modes(UT,PT and ET)were fitted and analyzed by using 17 kinds of hyperelastic constitutive equations embedded in commercial finite element software ABAQUS?The results show that the high-order Ogden equation and the second-order Polynomial equation are highly fitted.The third-order Ogden equation is selected for the finite element sealing simulation in the next chapter.(3)Finally,a two-dimensional plane simple sealing model of PEMFC was established for finite element simulation analysis.Then the contact pressure distribution of rubber sealing members in single-chip battery was discussed.At the same time,the influence of chamfer size,section length,and compression rate on the elastic deformation,contact pressure and Mises stress of rubber sealing parts are studied.The results show that the contact pressure of the seal increases and the sealing performance becomes better with the increase of compression ratio.Besides,the section length mainly affects the contact pressure in the middle of the seal.According to the sealing principle and under the reasonable sealing structure,the larger value of the section length is selected to increase the width of the contact surface to achieve better sealing effect.At last,the chamfer size has the least influence on the contact pressure of the sealing parts.Reducing the chamfer size can increase the contact pressure of the shoulder end of the sealing parts and increase the deformation degree of the rubber seals.In summary,when the compression ratio is 16%,the cross-section length is 1.8 mm,and the chamfer size is 0.01 mm,the sealing performance of the sealing component is the best.