燃料电池双极板.pdf

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1、SolvedwithCOMSOLMultiphysics5.1FuelCellBipolarPlateIntroductionThisstudypresentsamodelthatcouplesthethermalandthestructuralanalysisinabipolarplateinaprotonexchangemembranefuelcell(PEMFC).Thefuelcellstackconsistsofunitcellofanode,membrane,andcathodeconnected

2、inseriesthroughbipolarplates.Thebipolarplatesalsoserveasgasdistributorsforhydrogenandairthatisfedtotheanodeandcathodecompartments,respectively.Figure1belowshowsaschematicdrawingofafuelcellstack.Theunitcellandthesurroundingbipolarplatesareshownindetailintheu

3、pperrightcornerofthefigure.MembraneBipolarplateAnodeFuelcellstackCathodeFigure1:Schematicdrawingofthefuelcellstack.Theunitcellconsistsofananode,membraneelectrolyte,andacathode.Theunitcellissupportedandsuppliedwithreactantsthroughthebipolarplates.Thebipolarp

4、latesalsoserveascurrentcollectorsandfeeders.ThePEMFCisoneofthestrongestalternativesforautomotiveapplicationswhereithasthepotentialofdeliveringpowertoavehiclewithahigherefficiency,fromoiltopropulsion,thantheinternalcombustionengine.Thefuelcelloperatesattempe

5、raturesjustbelow100°C,whichmeansthatithastobeheatedatstart-up.Theheatingprocessinducesthermalstressesinthebipolarplates.Thisanalysisrevealsthemagnitudeandnatureofthesestresses.1

6、FUELCELLBIPOLARPLATESolvedwithCOMSOLMultiphysics5.1ModelDefinitionFigure2belows

7、howsthedetailedmodelgeometry.Theplateconsistsofgasslitsthatformthegaschannelsinthecell,holesforthetierodsthatkeepthestacktogether,andtheheatingelements,whicharepositionedinthemiddleofthegasfeedingchannelfortheelectrodes.Duetosymmetry,itispossibletoreducethe

8、modelgeometryto1/8oftheactualsizeofthecell.Heatsource1/41/8GaschannelsHolesfortierodsFigure2:Themodeledgeometry.Thestudyconsistsofathermal-structuralanalysis.Inthefollowingspecificationoftheproblemanumberofconstantsareused;theirvaluesarelistedinthefollowing

9、table.TheconstantQ1representsapowerof200Wdistributedovertheholethroughthe25bipolarplatesinthefuelcellstack.CONSTANTVALUEDESCRIPTION3Q1200/25/(π0.005^2·0.01)W/mVolumepowerinoneheatingelement52P19.82·10N