Hlau Ua Npuas Ncauj - Roj Cell Cold Start Performance Enhancement

Ua lag luamhlau ua npuas ncaujTam sim no yog ib qho kev xaiv zoo rau cov neeg khiav dej num rau cov roj hlwb vim lawv cov ntxeem tau microstructure, siab porosity, thiab zoo mechanical zog.
Ua ntej, qhov kev ua tau zoo ntawm polarization ntawm lub roj teeb nyob rau hauv ib txwm ua haujlwm ntawm chav tsev kub tau txheeb xyuas. Xav tias cathode yog lub ntsiab electrode uas txwv lub roj teeb qhov kev ua tau zoo, cov pa thaum uas tig mus ndlwg txoj kev yog siv rau lub anode ntawm ob leeg tib leeg, thiab cov pa parallel flow paths yog siv rau cathode nrog ib tug tshiab npib tsib xee-hlau ua npuas ncauj flow field, ntsig txog.
Txhawm rau kom pom tseeb qhov sib txawv ntawm qhov sib txawv thiab kev ua haujlwm sib txawv hauv ob qhov chaw khiav dej num, txoj kev tshawb fawb tau siv lub xovtooj ntawm tes nrog qhov loj ntawm 1.5 cm × 20 cm (cov pa roj tag nrho ntws mus rau sab ntev), uas me ntsis poob ntawm lub cell qub. kev ua tau zoo, thiab yog li ntawd, kev ua haujlwm ntawm tes polarization tsis siab. Tsis tas li ntawd, tib lub MEA (Nafion-112) tau siv rau ob lub hlwb hauv kev sim. Vim qhov curvature siab dua ntawm cov me me ntws channel hauv cov npuas hlau ntws, qhov siab poob ntawm ob qhov kawg yog siab dua piv rau qhov yooj yim ntev ncaj ntws channel hauv cov pa ntws, uas txhim kho cov pa roj rau cathode, kev khiav hauj lwm. siab, thiab tus nqi ntawm cov tshuaj tiv thaiv electrochemical, thiab nyob rau tib lub sij hawm, nws yuav tsum tau noj ntau dua cov pa roj cav lub zog mus rau ib tug tej yam degree thiab tsub kom lub twj tso kua mis poob. Lub zog siab tshaj plaws yog siab dua rau cov hlwb nroghlau ua npuas ncaujflow fields, thaum nyob rau hauv qis tam sim no, lub hwj chim ceev yog me ntsis qis dua li cov pa ntws teb hlwb. Zuag qhia tag nrho, qhov zoo ntawm kev siv cov hlau ua npuas dej ntws yog qhov tseem ceeb. Nyob rau hauv lub sij hawm ntev, vim muaj roj ntau dua thiab cov kua dej ntws hauv cov npuas hlau ntws, qhov chaw luv luv tuaj yeem siv rau hauv cov ntawv thov, lossis siv cov cathode thiab anode ntsug cross-supply (anode gas ntws raws cov ntev sab ntawm cov tsoos ntws channel, cov roj cathode ntws raws sab luv ntawm cov npuas dej ntws), uas ntxiv txo cov twj tso kua mis los ntawm cov cathode inlet thiab qhov hluav taws xob siab poob, thiab yog li xav kom paub txog cov khoom siv. kev txhim kho ntawm cov roj teeb kev ua tau zoo, thiab txawm tias muaj qhov sib piv lossis txawm tias lub zog muaj zog ntau dua li cov tsoos ntws channel, uas tuaj yeem ua tiav hauv lub sijhawm ntev. Yog li ntawd, nws yuav tsum paub txog kev txhim kho ntawm tes kev ua tau zoo thaum tswj cov twj tso kua mis piv rau lossis txawm tias qis dua li ntawm cov tsoos ntws channel.
Ntawm qhov tod tes, txhawm rau hais txog qhov kev txhawj xeeb ntawm qhov pib xoom pib, peb sib piv cov kev pib ua haujlwm zoo ntawm cov roj hlwb nrog cov hlau ua npuas dej thiab cov pa sib npaug ntawm cov channel ntawm cathode nyob rau hauv qhov tam sim no thiab qhov voltage tsis tu ncua, feem.
Ntawm qhov tod tes, rau qhov nrov sub-zero pib mob, peb comprehensively piv cov dynamic pib kev ua tau zoo ntawm cov roj hlwb nrog ua npuas ncauj hlau ndlwg teb thiab pa parallel flow channel ntawm lub cathode nyob rau hauv tas li tam sim no thiab tas li voltage hom, feem.
Cov npuas dej-hlau ntws qhia tau zoo heev, nrog kev ruaj khov ntawm tes thaum lub sijhawm pib thiab pib ua tiav, thaum ntawm qhov tsis sib xws, cov pa sib npaug-kawg channel ntawm tes, nrog qis thiab tsis ruaj khov ntawm tes tso tawm hluav taws xob thaum lub sijhawm ua haujlwm, txhim kho qhov kub thiab txias. nce tus nqi mus rau ib qho twg, tab sis vim qhov tsawg ntawm cov dej ntws, qhov ua tau ntawm icing thiab clogging nce linearly (nyob ntawm seb muaj pes tsawg tus ntws channel), uas ua rau Txawm li cas los xij, qhov ua tau zoo ntawm cov dej khov khov tuaj yeem nce linearly (nyob ntawm tus naj npawb ntawm cov dej ntws), uas ua rau muaj qhov hloov pauv ntawm cov khoom siv hluav taws xob hloov pauv thiab qhov ua tau zoo ntawm kev pib ua tsis tiav.
Hauv cov ntsiab lus, cov qauv ntxeem tau zoo heev ntawm cov roj cell nrogua npuas ncauj hlauFlow field muaj qhov zoo tshaj plaws ntawm lub xov tooj ntawm tes nrog ib txwm "trench-ridge" ntws channel nyob rau hauv ob qho tib si chav ua haujlwm kub thiab sub-zero dynamic startup tej yam kev mob.
Qhov siab tshaj plaws zog ceev thiab qhov kawg tam sim no ceev ntawm lub roj teeb ntawm chav tsev kub yog nce li ntawm 25%;
Nyob rau hauv sub-zero pib tej yam kev mob, qhov kev ua tau zoo ntawm cov roj teeb nrog ua npuas ncauj hlau khiav yog smoother thaum lub sij hawm pib, thiab qis-kub nws tus kheej-pib peev xwm tau zoo heev.
Tsis tas li ntawd, kev siv cov kev kho kom zoo dua qub rau cov ntaub ntawv hlau ua npuas dej, xws li kub plating los txhim kho cov conductivity, tsim nyog hydrophobicity ntau dua thiab kev kho corrosion kuj, thiab siv cov khoom siv.cov ntaub ntawv ua npuas ncaujNrog rau qhov zoo tshaj qhov pore qhov ntau thiab tsawg, porosity, thiab compression ratios, yuav tsum ntxiv dag zog rau kev ua haujlwm ntawm cov roj cell thiab txhim khu kev ua haujlwm ntawm lub caij txias pib.