Kev soj ntsuam ntawm Corrosion Mechanisms hauv Aluminium-Cased Lithium Iron Cells: Txhim kho kev nyab xeeb thiab siv tau ntev
Jun 15, 2026
Tso lus
Piv nrog rau lub hnab ntim thiab qee cov qauv roj teeb cylindrical, aluminium-cased roj teeb muaj kev cuam tshuam zoo dua thiab qhov ruaj khov. Tshwj xeeb tshaj yog nyob rau hauv siab - muaj peev xwm fais fab roj teeb tshuab, aluminium casings zoo txhim khu tag nrho cov rigidity ntawm lub hlwb thiab txo cov kev pheej hmoo ntawm deformation los ntawm lwm yam mechanical kev nyuaj siab thaum thauj thiab ua hauj lwm; yog li ntawd, lawv tau siv dav hauv kev tsheb ciav hlau, lub zog txuag hluav taws xob, thiab kev siv tsheb tshiab.
Under normal operating conditions, a dense and stable oxide passivation layer forms on the surface of the aluminum casing. Cov yeeb yaj kiab tiv thaiv no zoo tiv thaiv kev sib cuag ncaj qha ntawm cov hlau substrate thiab cov xov xwm sab nraud, yog li txhim kho corrosion kuj. Rau aluminium casings siv nyob rau hauv lithium-polymer roj teeb hlwb, kev ncaj ncees ntawm cov passivation txheej no ncaj qha mus rau lub sij hawm ntev - kev cia siab rau thiab kev pab lub neej ntawm lub roj teeb vaj tse.
Txawm li cas los xij, thaum lub sij hawm tsim khoom tiag tiag, yam xws li electrode sib dhos misalignment, residual burrs, los yog tsis txaus rwb thaiv tsev tuaj yeem ua rau muaj kev sib cuag ntawm qhov tsis zoo electrode tab (los yog cov khoom tsis zoo electrode) thiab cov phab ntsa sab hauv ntawm aluminium casing. Xws li kev sib cuag cuam tshuam rau sab hauv electrochemical equilibrium, tsim tej yam kev mob rau corrosion.
Cov kev tshawb fawb qhia tau hais tias cov roj teeb corroded feem ntau pom cov kev ua haujlwm tsis zoo, ua kom muaj peev xwm ploj mus, thiab txo qhov ruaj khov. Hauv qee qhov kev ua tsis tiav uas muaj cov prismatic hlwb nrog txhuas casings, corrosion feem ntau yog concentrated ntawm qhov chaw sib cuag ntawm qhov tsis zoo tab thiab cov casing; Tom qab ntawd nws kis mus rau thaj chaw ib puag ncig, thaum kawg cuam tshuam lub roj teeb kev ua haujlwm tag nrho.
Disassembly thiab tsom xam qhia tau hais tias thaum lub puab aluminium casing phab ntsa ntawm cov roj teeb noj qab haus huv nyob twj ywm du thiab zoo, corroded cheeb tsam nthuav tawm tawg, pulverization, thiab reticulated corrosion qauv. Scanning electron microscopy (SEM) ntawm aluminium casings los ntawm prismatic LFP hlwb qhia txog kev puas tsuaj loj hauv cheeb tsam corroded, qhia tias cov txheej txheem corrosion tau nkag mus tob rau hauv cov hlau substrate.
X-ray diffraction (XRD) tsom xam pom tias cov khoom siv corrosion muaj feem ntau ntawm lithium carbonate thiab me me ntawm lithium- aluminium compounds. Qhov no qhia tau hais tias, nyob rau hauv tej yam kev mob, lithium ions koom nyob rau hauv cov tshuaj tiv thaiv nyob rau hauv lub casing nto. Nyob rau hauv cov ntaub ntawv ntawm prismatic lithium roj teeb casings, yog hais tias ib tug hluav taws xob kev twb kev txuas cov ntaub ntawv ntawm qhov tsis zoo electrode thiab lub casing, lithium ions yuav nyiam tsiv mus nyob rau hauv lub casing thiab undergo ib intercalation cov tshuaj tiv thaiv.
Mechanistically, aluminium hlau lattice muaj cov qauv kev teeb tsa uas haum rau lithium ion intercalation. Thaum cov hluav taws xob tsis zoo ua rau kev sib cuag ncaj qha nrog lub casing, qee qhov lithium ions tuaj yeem nkag mus rau hauv aluminium lattice los ua lithium- aluminium compounds. Raws li cov tshuaj tiv thaiv tshwm sim, cov khoom nruab nrab xws li lithium oxide thiab lithium hydroxide daim ntawv rau ntawm qhov chaw; Qhov no yog qhov laj thawj tseem ceeb vim li cas cov qauv corroded pom qhov txawv alkalinity.
Raws li kev txhim kho corrosion, cov lithium tebchaw no ua rau cov pa roj carbon dioxide atmospheric, thaum kawg tsim cov lithium carbonate ntau heev. Rau lithium hlau phosphate (LFP) roj teeb casings, xws li deposits tsis tsuas yog cuam tshuam lub structural kev ncaj ncees ntawm lub casing tab sis kuj ceev electrolyte noj thiab nce nyob rau hauv impedance, ua rau tsis tu ncua roj teeb muaj peev xwm degradation.
Tshaj li cov tshuaj tiv thaiv lawv tus kheej, kev hloov pauv hauv cov peev txheej casing yog qhov tseem ceeb cuam tshuam rau corrosion. Kev tshawb fawb qhia tau hais tias thaum lub sij hawm muaj peev xwm sib txawv tseem ceeb ntawm lub casing thiab qhov tsis zoo electrode nyob rau hauv lub cell noj qab haus huv, qhov sib txawv no poob rau zero nyob rau hauv cov hlwb uas muaj corrosion. Rau lithium- ion hlwb nrog aluminium casings, qhov tsis tshua muaj peev xwm sib txawv feem ntau qhia txog qhov tsis ua haujlwm hauv kev rwb thaiv tsev, yog li tsim cov xwm txheej uas tso cai rau cov tshuaj tiv thaiv corrosion mus.
Los ntawm kev pom kev tsim khoom, tus yuam sij rau kev tiv thaiv corrosion yog nyob rau hauv kev txhim kho kev ntseeg siab ntawm lub casing lub rwb thaiv tsev. Cov txheej txheem ntau lawm rau aluminium casings yuav tsum nruj me ntsis tswj qhov ntev ntawm electrode, qhov ntev ntev, thiab qhov chaw sib dhos; Tib lub sijhawm, kev tsim cov rwb thaiv tsev nyob rau hauv lub tab cheeb tsam yuav tsum tau ntxiv dag zog los tiv thaiv kev sib cuag ncaj qha ntawm qhov tsis zoo electrode thiab cov casing. Tsis tas li ntawd, cov txheej txheem muaj zog rau kev saib xyuas cov peev txheej thiab cov khoom siv tshuaj ntsuam xyuas yuav tsum tau tsim los txheeb xyuas cov hlwb uas muaj peev xwm txaus ntshai thaum ntxov tshaj plaws.
Hauv cov ntsiab lus, aluminium casing corrosion yog qhov tseem ceeb ntawm cov txheej txheem electrochemical uas tau tsav los ntawm kev sib cuag txawv txav ntawm qhov tsis zoo electrode thiabAluminium roj teeb plhaub, uas ua rau muaj cov tshuaj tiv thaiv kab mob cuam tshuam nrog kev sib txuas ntawm lithium ions rau hauv cov hlau txhuas. As high-energy-density batteries evolve, the optimization of aluminum casing materials, the upgrading of insulation structures, and continued advancements in in-line inspection technologies will be crucial for enhancing the safety, reliability, and service life of lithium-ion batteries.
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