Cov roj teeb lithium yog lub roj teeb loj tshaj plaws hauv 20 xyoo dhau los thiab tau siv dav hauv cov khoom siv hluav taws xob.Kev tawg tsis ntev los no ntawm cov xov tooj ntawm tes thiab laptops yog qhov tseem ceeb ntawm lub roj teeb tawg.Lub xov tooj ntawm tes thiab lub roj teeb lub laptop zoo li cas, lawv ua haujlwm li cas, vim li cas lawv tawg, thiab yuav ua li cas kom tsis txhob lawv.
Cov kev mob tshwm sim pib tshwm sim thaum lub lithium cell yog overcharged rau qhov voltage siab tshaj 4.2V.Qhov siab dua qhov overcharge siab, qhov kev pheej hmoo siab dua.Ntawm qhov voltages siab tshaj 4.2V, thaum tsawg tshaj li ib nrab ntawm cov lithium atoms nyob rau hauv cov khoom cathode, lub cell cia feem ntau vau, ua rau ib tug mus tas li poob rau hauv lub roj teeb muaj peev xwm.Yog tias tus nqi txuas ntxiv mus, cov lithium hlau tom ntej yuav nyob rau saum npoo ntawm cov khoom siv cathode, vim tias lub cathode lub cell cia yog tag nrho ntawm lithium atoms.Cov lithium atoms loj hlob dendritic crystals los ntawm cathode nto nyob rau hauv cov kev taw qhia ntawm lithium ions.Cov lithium crystals yuav dhau los ntawm daim ntawv diaphragm, luv lub anode thiab cathode.Qee lub sij hawm lub roj teeb tawg ua ntej qhov luv luv tshwm sim.Tias yog vim li cas thaum lub sij hawm overcharge txheej txheem, cov ntaub ntawv xws li electrolytes tawg los tsim cov roj uas ua rau lub roj teeb casing los yog lub siab valve kom o thiab tawg, tso cai rau oxygen rau react nrog lithium atoms accumulated nyob rau saum npoo ntawm cov electrode tsis zoo thiab tawg.
Yog li ntawd, thaum lub roj teeb lithium them, nws yog ib qho tsim nyog los teeb tsa qhov hluav taws xob sab saud, coj mus rau hauv tus account lub roj teeb lub neej, muaj peev xwm, thiab kev nyab xeeb.Qhov zoo tshaj plaws them voltage sab sauv txwv yog 4.2V.Tseem yuav tsum muaj qhov txwv qis dua thaum cov lithium hlwb tawm.Thaum lub cell voltage poob qis dua 2.4V, qee cov khoom pib tawg.Thiab vim hais tias lub roj teeb yuav tso tawm tus kheej, muab qhov ntev ntawm qhov voltage yuav qis dua, yog li ntawd, nws yog qhov zoo tshaj kom tsis txhob tso tawm 2.4V kom nres.Los ntawm 3.0V txog 2.4V, lithium roj teeb tso tawm tsuas yog li 3% ntawm lawv lub peev xwm.Yog li ntawd, 3.0V yog qhov zoo tshaj plaws tso tawm hluav taws xob.Thaum them nyiaj thiab tso tawm, ntxiv rau qhov txwv tsis pub muaj hluav taws xob, qhov txwv tam sim no tseem tsim nyog.Thaum lub sijhawm tam sim no siab dhau lawm, lithium ions tsis muaj sijhawm nkag mus rau hauv lub cell cia, yuav khaws cia rau saum npoo ntawm cov khoom.
Raws li cov ions no tau txais cov hluav taws xob, lawv crystallize lithium atoms ntawm cov khoom siv, uas tuaj yeem ua rau muaj kev phom sij xws li overcharging.Yog hais tias cov ntaub ntawv roj teeb tawg, nws yuav tawg.Yog li ntawd, kev tiv thaiv ntawm lithium ion roj teeb yuav tsum tsawg kawg suav nrog cov kev txwv sab sauv ntawm kev them nqi hluav taws xob, qis qis ntawm qhov hluav taws xob tawm hluav taws xob thiab kev txwv siab ntawm tam sim no.Feem ntau, ntxiv rau lithium roj teeb tseem ceeb, yuav muaj lub phaj tiv thaiv, uas yog qhov tseem ceeb los muab cov kev tiv thaiv peb.Txawm li cas los xij, cov phaj tiv thaiv ntawm peb qhov kev tiv thaiv no yog pom tseeb tsis txaus, lub ntiaj teb lithium roj teeb tawg tshwm sim los yog nquag.Txhawm rau kom muaj kev nyab xeeb ntawm cov roj teeb, xav tau kev tshuaj xyuas kom zoo dua ntawm qhov ua rau lub roj teeb tawg.
Ua rau tawg:
1. Loj sab hauv polarization;
2.Cov ncej ncej absorbs dej thiab reacts nrog electrolyte gas nruas;
3.Qhov zoo thiab kev ua haujlwm ntawm cov electrolyte nws tus kheej;
4.Qhov kev txhaj tshuaj ua kua tsis tuaj yeem ua tau raws li cov txheej txheem;
5. Lub laser vuam foob kev ua haujlwm tsis zoo nyob rau hauv cov txheej txheem kev npaj, thiab kuaj pom cov pa tawm.
6. Plua plav thiab ncej-daim plua plav yog yooj yim ua rau microshort circuit ua ntej;
7.Positive thiab tsis zoo phaj thicker dua cov txheej txheem ntau, nyuaj rau plhaub;
8. Sealing teeb meem ntawm kev txhaj tshuaj ua kua, tsis zoo sealing kev ua tau zoo ntawm steel pob ua rau lub nruas roj;
9.Shell tuaj cov khoom plhaub phab ntsa yog tuab heev, plhaub deformation cuam tshuam rau thickness;
10. Qhov kub ambient sab nraud kuj yog qhov tseem ceeb ntawm kev tawg.
Hom tawg
Explosion type Analysis Cov hom roj teeb tseem ceeb tawg tuaj yeem raug cais raws li sab nraud luv luv, sab hauv luv luv, thiab overcharge.Sab nraud ntawm no yog hais txog sab nraud ntawm lub xov tooj ntawm tes, suav nrog qhov luv luv los ntawm kev tsim hluav taws xob tsis zoo ntawm cov roj teeb sab hauv.Thaum lub voj voog luv luv tshwm sim sab nraud ntawm tes, thiab cov khoom siv hluav taws xob tsis tuaj yeem txiav tawm lub voj voog, lub xov tooj ntawm tes yuav tsim kom muaj cua sov sab hauv, ua rau ib feem ntawm cov electrolyte vaporize, lub plhaub roj teeb.Thaum qhov kub thiab txias ntawm lub roj teeb yog siab txog 135 degrees Celsius, daim ntawv diaphragm uas zoo yuav kaw lub qhov zoo, cov tshuaj tiv thaiv electrochemical raug txiav los yog yuav luag txiav, qhov tam sim no plunges, thiab kub kuj poob qis, yog li tsis txhob tawg. .Tab sis daim ntawv diaphragm nrog tus nqi kaw tsis zoo, lossis ib qho uas tsis kaw tag nrho, yuav ua rau lub roj teeb sov, vaporize electrolyte ntau dua, thiab thaum kawg tawg lub roj teeb, lossis txawm tias nce lub roj teeb kub mus rau qhov chaw uas cov khoom hlawv. thiab tawg.Internal luv Circuit Court feem ntau yog tshwm sim los ntawm burr ntawm tooj liab ntawv nyiaj thiab txhuas ntawv ci tho lub diaphragm, los yog cov dendritic crystals ntawm lithium atoms tho lub diaphragm.
Cov hlau me me, zoo li rab koob no tuaj yeem ua rau microshort circuits.Vim tias rab koob nyias nyias thiab muaj qee qhov kev tiv thaiv tus nqi, qhov tam sim no tsis tas yuav loj heev.Cov burrs ntawm tooj liab aluminium ntawv ci yog tshwm sim nyob rau hauv cov txheej txheem ntau lawm.Qhov tshwm sim tau pom yog tias lub roj teeb xau sai heev, thiab feem ntau ntawm lawv tuaj yeem raug tshuaj xyuas los ntawm cov chaw tsim khoom ntawm tes lossis cov chaw sib dhos.Thiab vim hais tias cov burrs me me, lawv qee zaum hlawv tawm, ua rau lub roj teeb rov zoo li qub.Yog li ntawd, qhov tshwm sim ntawm kev tawg tshwm sim los ntawm burr micro luv luv Circuit Court tsis siab.Xws li kev pom, feem ntau tuaj yeem them nqi los ntawm sab hauv ntawm txhua lub koom haum ntawm tes, qhov hluav taws xob ntawm lub roj teeb tsis zoo, tab sis tsis tshua muaj kev tawg, tau txais kev txhawb nqa.Yog li ntawd, qhov tawg tshwm sim los ntawm qhov luv luv Circuit Court feem ntau yog tshwm sim los ntawm overcharge.Vim hais tias muaj rab koob zoo li lithium hlau muaju nyob txhua qhov chaw ntawm cov ntaub ntawv hluav taws xob sab nraum qab, cov ntsiab lus puncture nyob txhua qhov chaw, thiab micro-short circuit tshwm sim txhua qhov chaw.Yog li ntawd, lub cell kub yuav maj mam nce, thiab thaum kawg qhov kub siab yuav electrolyte roj.Qhov xwm txheej no, txawm tias qhov kub thiab txias dhau los ua kom cov khoom tawg tawg, lossis lub plhaub tau tawg ua ntej, kom cov huab cua hauv thiab lithium hlau hnyav oxidation, yog qhov kawg ntawm qhov tawg.
Tab sis xws li tawg, tshwm sim los ntawm ib qho luv luv Circuit Court tshwm sim los ntawm overcharging, tsis tas yuav tshwm sim thaum lub sij hawm them nyiaj.Nws yog qhov ua tau tias cov neeg siv khoom yuav tsum tsis them thiab nqa lawv lub xov tooj tawm ua ntej lub roj teeb kub txaus los hlawv cov ntaub ntawv thiab tsim cov roj txaus kom tawg lub roj teeb.Cov cua sov tsim los ntawm ntau lub voj voog luv luv maj mam sov lub roj teeb thiab, tom qab qee lub sijhawm, tawg.Cov lus piav qhia ntawm cov neeg siv khoom yog tias lawv khaws lub xov tooj thiab pom tias nws kub heev, ces muab pov tseg thiab tawg.Raws li cov saum toj no hom kev tawg, peb tuaj yeem tsom mus rau kev tiv thaiv overcharge, tiv thaiv kev tiv thaiv sab nraud luv luv, thiab txhim kho kev nyab xeeb ntawm tes.Ntawm lawv, kev tiv thaiv ntawm overcharge thiab sab nraud luv Circuit Court belongs rau kev tiv thaiv hluav taws xob, uas muaj feem xyuam nrog kev tsim cov roj teeb thiab cov roj teeb.Lub ntsiab lus tseem ceeb ntawm kev txhim kho kev nyab xeeb ntawm tes yog tshuaj lom neeg thiab kev tiv thaiv, uas muaj kev sib raug zoo nrog cov tuam txhab ntawm tes.
Safe zais teeb meem
Kev nyab xeeb ntawm lithium ion roj teeb tsis yog tsuas yog cuam tshuam nrog cov xwm txheej ntawm cov khoom siv ntawm tes nws tus kheej, tab sis kuj muaj feem xyuam nrog kev npaj technology thiab kev siv lub roj teeb.Lub xov tooj ntawm tes roj teeb feem ntau tawg, ntawm ib sab, vim qhov tsis ua haujlwm ntawm kev tiv thaiv Circuit Court, tab sis qhov tseem ceeb tshaj, cov khoom siv tsis tau daws qhov teeb meem.
Cobalt acid lithium cathode active khoom yog ib tug heev mature system nyob rau hauv me me roj teeb, tab sis tom qab ib tug tag nrho cov nqi, tseem muaj ntau lithium ions nyob rau hauv lub anode, thaum overcharge, tshuav nyob rau hauv lub anode ntawm lithium ion yuav tsum flock rau lub anode. , yog tsim nyob rau hauv cathode dendrite yog siv cobalt acid lithium roj teeb overcharge corollary, txawm nyob rau hauv ib txwm tsub zuj zuj thiab paug txheej txheem, kuj tseem yuav muaj ntau tshaj lithium ions pub dawb rau qhov tsis zoo electrode los tsim dendrites.Lub zog theoretical tshwj xeeb ntawm cov khoom siv lithium cobalate yog ntau tshaj 270 mah / g, tab sis lub peev xwm tiag tiag tsuas yog ib nrab ntawm lub peev xwm theoretical los xyuas kom meej nws cov kev ua haujlwm cycling.Hauv kev siv, vim qee qhov laj thawj (xws li kev puas tsuaj rau kev tswj hwm) thiab lub roj teeb them hluav taws xob siab dhau lawm, qhov seem ntawm lithium hauv qhov zoo electrode yuav raug tshem tawm, los ntawm electrolyte mus rau qhov tsis zoo electrode nyob rau hauv. daim ntawv ntawm lithium hlau deposition los ua dendrites.Dendrites Pierce lub diaphragm, tsim ib qho luv luv Circuit Court.
Lub ntsiab tivthaiv ntawm cov electrolyte yog carbonate, uas muaj ib tug tsawg flash point thiab ib tug boiling point.Nws yuav hlawv los yog tawg nyob rau hauv tej yam kev mob.Yog tias lub roj teeb overheats, nws yuav ua rau oxidation thiab txo cov carbonate hauv cov electrolyte, ua rau muaj roj ntau thiab kub ntau.Yog tias tsis muaj kev ruaj ntseg valve lossis cov roj tsis tso tawm los ntawm kev nyab xeeb valve, lub siab sab hauv ntawm lub roj teeb yuav nce siab thiab ua rau tawg.
Polymer electrolyte lithium ion roj teeb tsis yooj yim daws qhov teeb meem kev nyab xeeb, lithium cobalt acid thiab organic electrolyte kuj tseem siv, thiab cov electrolyte yog colloidal, tsis yooj yim rau xau, yuav tshwm sim hnyav combustion, combustion yog qhov teeb meem loj tshaj ntawm polymer roj teeb kev nyab xeeb.
Kuj tseem muaj qee qhov teeb meem ntawm kev siv lub roj teeb.Ib qho hluav taws xob sab nraud lossis sab hauv tuaj yeem tsim tau ob peb puas amperes ntawm cov tam sim no ntau dhau.Thaum ib qho kev luv luv sab nraud tshwm sim, lub roj teeb tam sim ntawd tso tawm tam sim no loj, siv lub zog loj thiab ua kom muaj cua sov loj ntawm lub zog sab hauv.Lub hauv paus luv Circuit Court tsim ib tug loj tam sim no, thiab kub nce, ua rau lub diaphragm yaj thiab lub luv luv Circuit Court cheeb tsam nthuav, yog li tsim ib tug vicious voj voog.
Lithium ion roj teeb kom ua tiav ib lub xov tooj ntawm tes 3 ~ 4.2V siab ua hauj lwm voltage, yuav tsum coj lub decomposition ntawm qhov voltage yog ntau tshaj 2V organic electrolyte, thiab siv cov organic electrolyte nyob rau hauv siab tam sim no, kub tej yam kev mob yuav tsum electrolyzed, electrolytic. gas, uas ua rau muaj zog sab hauv, loj yuav tawg los ntawm lub plhaub.
Overcharge tej zaum yuav precipitate lithium hlau, nyob rau hauv cov ntaub ntawv ntawm lub plhaub rupture, ncaj qha kev sib cuag nrog huab cua, ua rau combustion, tib lub sij hawm ignition electrolyte, muaj zog nplaim taws, ceev expansion ntawm roj, tawg.
Tsis tas li ntawd, rau lub xov tooj ntawm tes lithium ion roj teeb, vim kev siv tsis raug, xws li extrusion, cuam tshuam thiab kev siv dej ua rau lub roj teeb nthuav dav, deformation thiab tawg, thiab lwm yam, uas yuav ua rau lub roj teeb luv luv, hauv kev tso tawm lossis them cov txheej txheem tshwm sim. los ntawm tshav kub tawg.
Kev nyab xeeb ntawm lithium roj teeb:
Yuav kom tsis txhob overdischarge los yog overcharge los ntawm kev siv tsis raug, triple tiv thaiv mechanism yog teem rau hauv ib lub lithium ion roj teeb.Ib qho yog kev siv cov khoom hloov pauv, thaum qhov kub ntawm lub roj teeb nce, nws qhov kev tiv thaiv yuav nce siab, thaum kub siab dhau lawm, yuav cia li nres lub hwj chim;Qhov thib ob yog xaiv cov khoom muab faib kom tsim nyog, thaum qhov kub nce mus rau qee qhov nqi, micron pores ntawm qhov muab faib yuav cia li yaj, kom lithium ions tsis tuaj yeem dhau, lub roj teeb sab hauv cov tshuaj tiv thaiv nres;Qhov thib peb yog los teeb tsa lub valve kev nyab xeeb (uas yog, lub qhov cua nyob rau sab saum toj ntawm lub roj teeb).Thaum lub siab sab hauv ntawm lub roj teeb nce mus rau ib qho nqi, qhov kev nyab xeeb valve yuav qhib tau txais kev ruaj ntseg ntawm lub roj teeb.
Qee zaum, txawm hais tias lub roj teeb nws tus kheej muaj kev tswj hwm kev nyab xeeb, tab sis vim qee qhov laj thawj los ntawm kev tswj tsis ua haujlwm, qhov tsis muaj kev ruaj ntseg valve lossis roj tsis muaj sijhawm tso tawm los ntawm kev nyab xeeb valve, lub siab sab hauv ntawm lub roj teeb yuav nce siab thiab ua rau kev tawg.Feem ntau, tag nrho lub zog khaws cia hauv cov roj teeb lithium-ion yog qhov sib npaug ntawm lawv txoj kev nyab xeeb.Raws li lub peev xwm ntawm lub roj teeb nce, lub ntim ntawm lub roj teeb kuj nce, thiab nws cov cua kub dissipation kev ua tau zoo deteriorates, thiab muaj peev xwm ntawm cov xwm txheej yuav loj tuaj.Rau cov roj teeb lithium-ion siv hauv cov xov tooj ntawm tes, qhov tseem ceeb yuav tsum tau ua yog tias qhov tshwm sim ntawm kev nyab xeeb kev nyab xeeb yuav tsum tsawg dua ib ntawm ib lab, uas tseem yog tus qauv yam tsawg kawg nkaus rau cov pej xeem.Rau cov roj teeb uas muaj peev xwm loj lithium-ion, tshwj xeeb tshaj yog rau cov tsheb, nws yog ib qho tseem ceeb heev uas yuav tsum tau txais kev tso cua sov.
Kev xaiv cov khoom siv hluav taws xob zoo dua, cov khoom siv lithium manganese oxide, raws li cov qauv molecular kom ntseeg tau tias nyob rau hauv tag nrho lub xeev, cov lithium ions nyob rau hauv qhov zoo electrode tau tag nrho embedded rau hauv qhov tsis zoo carbon qhov, fundamentally zam lub tiam ntawm dendrites.Nyob rau tib lub sijhawm, cov qauv ruaj khov ntawm lithium manganese acid, kom nws cov oxidation kev ua tau zoo yog qis dua lithium cobalt acid, decomposition kub ntawm lithium cobalt acid ntau tshaj 100 ℃, txawm tias vim yog sab nraud luv luv Circuit Court (kub), sab nraud. luv-circuit, overcharging, kuj tuaj yeem zam qhov kev phom sij ntawm combustion thiab tawg los ntawm precipitated lithium hlau.
Tsis tas li ntawd, kev siv cov khoom siv lithium manganate tuaj yeem txo tus nqi zoo heev.
Txhawm rau txhim kho kev ua haujlwm ntawm cov cuab yeej tswj kev nyab xeeb uas twb muaj lawm, peb yuav tsum ua ntej txhim kho kev nyab xeeb ntawm lithium ion roj teeb tub ntxhais, uas yog qhov tseem ceeb tshwj xeeb rau cov roj teeb muaj peev xwm loj.Xaiv lub diaphragm nrog zoo thermal kaw kev ua haujlwm.Lub luag haujlwm ntawm lub diaphragm yog cais cov ncej zoo thiab tsis zoo ntawm lub roj teeb thaum tso cai rau kev tso cai ntawm lithium ions.Thaum qhov kub thiab txias nce, daim nyias nyias raug kaw ua ntej nws melts, tsa lub sab hauv tsis kam mus rau 2,000 ohms thiab kaw cov tshuaj tiv thaiv sab hauv.Thaum lub siab sab hauv lossis kub ncav cuag tus qauv preset, qhov tawg-pov thawj valve yuav qhib thiab pib txo qhov siab los tiv thaiv kev sib tsoo ntau dhau ntawm cov pa sab hauv, deformation, thiab thaum kawg ua rau lub plhaub tawg.Txhim kho kev tswj rhiab heev, xaiv cov kev tswj tsis tau rhiab ntau thiab txais kev tswj hwm ntawm ntau yam tsis muaj (uas yog qhov tseem ceeb tshwj xeeb rau cov roj teeb muaj peev xwm loj).Rau lub peev xwm loj lithium ion roj teeb pob yog series / sib npaug ntawm ntau lub xov tooj ntawm tes, xws li phau ntawv computer voltage ntau dua 10V, muaj peev xwm loj, feem ntau siv 3 mus rau 4 ib lub roj teeb ib zaug tuaj yeem ua tau raws li qhov yuav tsum tau muaj, thiab tom qab ntawd 2 mus rau 3 series ntawm roj teeb pob thaum uas tig mus, txhawm rau kom muaj peev xwm loj.
Lub roj teeb muaj peev xwm loj nws tus kheej yuav tsum tau nruab nrog kev tiv thaiv zoo tshaj plaws, thiab ob hom Circuit Board modules yuav tsum tau txiav txim siab: ProtectIonBoardPCB module thiab SmartBatteryGaugeBoard module.Tag nrho cov roj teeb tiv thaiv tsim muaj xws li: qib 1 tiv thaiv IC (tiv thaiv roj teeb overcharge, overdischarge, luv luv Circuit Court), qib 2 tiv thaiv IC (tiv thaiv qhov thib ob overvoltage), fuse, LED qhia, ntsuas kub thiab lwm yam khoom.Nyob rau hauv ntau theem kev tiv thaiv mechanism, txawm nyob rau hauv cov ntaub ntawv ntawm txawv txav lub hwj chim charger thiab laptop, lub laptop roj teeb tsuas yog hloov mus rau lub tsis siv neeg tiv thaiv lub xeev.Yog tias qhov xwm txheej tsis loj, nws feem ntau ua haujlwm ib txwm tom qab tau ntsaws thiab tshem tawm yam tsis muaj kev tawg.
Cov thev naus laus zis hauv qab siv hauv cov roj teeb lithium-ion siv hauv laptops thiab xov tooj ntawm tes tsis muaj kev nyab xeeb, thiab cov qauv kev nyab xeeb yuav tsum tau xav txog.
Hauv kev xaus, nrog kev nce qib ntawm cov khoom siv thev naus laus zis thiab kev nkag siab tob ntawm tib neeg txoj kev nkag siab ntawm cov kev xav tau rau kev tsim, tsim khoom, kuaj thiab siv cov roj teeb lithium ion, lub neej yav tom ntej ntawm lithium ion roj teeb yuav muaj kev nyab xeeb dua.
Post lub sij hawm: Mar-07-2022