1 Lub hauv paus ntsiab lus ua haujlwm ntawm lithium-ion roj teeb:
Cov roj teeb lithium ion khaws cia thiab tso tawm lub zog los ntawm kev txav ntawm lithium ions ntawm qhov zoo thiab tsis zoo electrodes.
Thaum lub sij hawm them nqi, ib qho hluav taws xob sab nraud quab yuam lithium ions txav los ntawm qhov zoo electrode mus rau qhov tsis zoo electrode thiab muab cia rau hauv cov khoom tsis zoo electrode.
Thaum lub sij hawm tso tawm, lithium ions raug tso tawm los ntawm qhov tsis zoo electrode thiab txav mus rau qhov zoo electrode, tso lub zog rau cov khoom siv.
2 Voltage variation:
Thaum pib ntawm kev them nyiaj, vim muaj kev tiv thaiv sab hauv thiab polarization cuam tshuam hauv lub roj teeb, qhov hluav taws xob yuav qis dua.
Raws li kev them nyiaj nce mus, cov tshuaj tiv thaiv hauv lub roj teeb maj mam ncav cuag qhov sib npaug, thiab qhov hluav taws xob maj mam nce mus txog thaum nws ncav cuagcharge cut-off voltage.
Noj ternary lithium roj teeb ua piv txwv, lawv cov txheej txheem them nyiaj tuaj yeem muab faib ua plaub theem: kev them nqi qis (qis-voltage ua ntej them), them tam sim no tsis tu ncua, tsis tu ncua voltage them, thiab them nyiaj txiav tawm.
Thaum lub sij hawm trickle charging theem, yog tias lub roj teeb voltage qis dua 3V, kev them nyiaj ua ntej yuav ua ntej. Lub sijhawm no, qhov them tam sim no yog 1/10 ntawm qhov teeb tsa tam sim no, thiab qhov voltage maj mam nce. Thaum lub roj teeb hluav taws xob nce siab tshaj qhov pib them nqi, nws nkag mus rau hauvtsis tu ncua tam sim no them theem. Lub sijhawm no, lub zog them tam sim no tau nce, thiab lub roj teeb voltage maj mam nce nrog cov txheej txheem them tam sim no. Feem ntau, qhov voltage teem rau ib lub roj teeb yog 3.0-4.2V. Thaum lub roj teeb voltage nce mus rau 4.2V, qhov tam sim no them tas mus li thiab qhovtsis tu ncua voltage them theempib. Lub sijhawm no, lub zog them hluav taws xob tau khaws cia ntawm 4.2V, thiab qhov them tam sim no maj mam txo. Thaum qhov tam sim no poob rau 1/10 ntawm lub teeb them tam sim no, them nyiaj xaus.
Thaum lub sij hawm tso tawm, qhov sib txawv ntawm qhov hloov hluav taws xob yog qhov sib txawv rau qhov ntawd thaum lub sijhawm them nyiaj. Thaum pib ntawm kev tso tawm, qhov hluav taws xob kuj yog siab heev. Nrog rau kev noj cov lithium ions thiab kev cuam tshuam ntawm kev tiv thaiv sab hauv ntawm lub roj teeb, qhov voltage maj mam txo kom txog thaum nws nce mus txog.tshem tawm qhov voltage.
Thaum tso tawm, qhov hluav taws xob nkhaus ntawm lithium-ion roj teeb tuaj yeem muab faib ua peb theem. Nyob rau hauv thawj theem, lub davhlau ya nyob twg voltage poob sai heev, thiab qhov siab dua tus nqi tso tawm, qhov voltage poob sai dua. Tom qab ntawd, lub roj teeb voltage nkag mus rau theem maj mam hloov, uas yog hu ua lubtoj siab cheeb tsam ntawm lub roj teeb. Qhov me me ntawm qhov paug tawm, lub cheeb tsam toj siab ntev ntev, thiab qhov siab dua qhov siab ntawm qhov siab, qhov voltage poob qis dua. Thaum kawg, raws li lub roj teeb theem ze tshaj tawm, lub load voltage ntawm lub roj teeb pib poob sharply mus txog rau thaum nws mus txog rau lub load.tshem tawm qhov voltage.
3 Yog vim li cas rau qhov voltage fluctuations:
1. Internal kuj ntawm lub roj teeb:Lub roj teeb nthuav tawm qee qhov kev tiv thaiv sab hauv thaum them thiab tawm, uas tuaj yeem ua rau txo qis hauv qhov hluav taws xob.
2. Cov nyhuv Polarization:Thaum lub sij hawm them thiab tso tawm cov txheej txheem, qhov zoo thiab qhov tsis zoo ntawm lub roj teeb yuav ntsib polarization, uas txhais tau hais tias cov nqi xa tawm ntawm cov electrode nto tsis sib xws, ua rau muaj kev hloov pauv ntawm qhov hluav taws xob.
3. Tshuaj tiv thaiv kinetics:Tus nqi ntawm cov tshuaj tiv thaiv hauv lub roj teeb kuj tuaj yeem cuam tshuam cov kev hloov pauv ntawm qhov hluav taws xob. Qhov ceev ntawm cov tshuaj tiv thaiv tus nqi, qhov hloov pauv hloov ceev dua; Ntawm qhov tsis sib xws, qhov qeeb qeeb.
Thaum lub sij hawm them thiab tso tawm cov txheej txheem ntawm lithium-ion roj teeb, qhov hluav taws xob yuav sib txawv vim muaj yam xws li kev tiv thaiv sab hauv, cov teebmeem polarization, thiab tshuaj lom neeg cov tshuaj tiv thaiv kinetics. Qhov kev hloov pauv no yog ib feem ntawm lub roj teeb ua haujlwm thiab qhov taw qhia tseem ceeb rau kev ntsuas roj teeb kev ua haujlwm thiab kev noj qab haus huv.
4 Dab tsi yog qhov cuam tshuam ntawm kev hloov hluav taws xob ntawm kev ua haujlwm ntawm lithium-ion roj teeb
1. Kev sib raug zoo ntawm qhov voltage thiab muaj peev xwm:
Feem ntau hais lus, lub peev xwm ntawm lub roj teeb yog ncaj qha proportional rau nws qhov voltage. Qhov no txhais tau hais tias raws li qhov voltage nce, lub peev xwm ntawm lub roj teeb kuj yuav nce raws li, cia nws khaws cia ntau zog. Yog li ntawd, high-voltage lithium-ion roj teeb feem ntau muaj lub neej ntev dua.
2. Kev sib raug zoo ntawm qhov hluav taws xob thiab kev tawm nkhaus:
Cov kab hluav taws xob tawm yog qhov nkhaus ntawm qhov kev hloov pauv ntawm cov roj teeb lithium-ion thaum lub sijhawm siv. Qhov sib txawv voltages tuaj yeem cuam tshuam cov duab thiab txoj kab nqes ntawm qhov kev tawm nkhaus. Feem ntau hais lus, qhov paug tawm ntawm cov roj teeb lithium qhia tau hais tias qhov kev poob qis tsis tu ncua, tab sis cov duab thiab tus nqi qis ntawm qhov nkhaus yuav txawv nrog qhov sib txawv. Qhov no yog qhov tseem ceeb heev rau kev siv cov khoom siv hluav taws xob ib txwm muaj thiab qhov tseeb ntawm cov roj teeb qib.
3. Kev sib raug zoo ntawm qhov hluav taws xob thiab kev them nqi / tso tawm ceev:
Lithium ion roj teeb uas muaj hluav taws xob ntau dua tuaj yeem them thiab tawm sai dua. Qhov no txhais tau tias yog tias peb siv cov roj teeb lithium siab, peb tuaj yeem them cov khoom siv hluav taws xob sai dua thiab siv tau ntev dua. Txawm li cas los xij, qhov hluav taws xob ntau dhau tuaj yeem ua rau lub roj teeb overheating thiab kev puas tsuaj, yog li kev sib npaug yuav tsum tau ua hauv kev tsim thiab siv cov txheej txheem.
4. Kev sib raug zoo ntawm qhov hluav taws xob thiab kev nyab xeeb:
Kev them nyiaj ntau dhau thiab tshaj tawm ntawm cov roj teeb lithium-ion tuaj yeem cuam tshuam rau lawv txoj kev nyab xeeb thiab ua rau muaj xwm txheej loj xws li hluav taws kub. Qhov kev txwv tsis pub muaj hluav taws xob ntawm cov roj teeb yog ib qho tseem ceeb uas yuav tsum tau xav txog thaum tsim cov khoom siv hluav taws xob tswj xyuas kom muaj kev nyab xeeb ntawm cov roj teeb. Thaum lub roj teeb hluav taws xob ntau tshaj qhov qub, nws yuav ua rau lub roj teeb tiv thaiv kev tiv thaiv, xws li kev tiv thaiv hluav taws xob los yog kev tiv thaiv luv luv, los tiv thaiv cov roj teeb puas lossis kev nyab xeeb.
5. Lwm yam teebmeem ntawm kev hloov hluav taws xob:
Cov roj teeb lithium ion uas nyob rau hauv lub xeev tsis tshua muaj hluav taws xob ntev ntev tuaj yeem ua rau muaj teeb meem tshuaj lom neeg hauv lub roj teeb, xws li decomposition ntawm electrolyte thiab detachment ntawm active tshuaj, uas yuav ua rau irreversible degradation ntawm roj teeb muaj peev xwm.
Tsis tshua muaj hluav taws xob kuj tseem tuaj yeem ua rau kev hloov pauv hauv cov qauv hauv lub roj teeb, xws li kev nthuav dav tsis sib xws thiab kev cog lus ntawm cov khoom siv hluav taws xob, ua rau lub roj teeb hnyav ntxiv thiab kev ua haujlwm tsis zoo.
Qhov sib txawv ntawm qhov voltage ntawm lithium-ion roj teeb muaj qhov cuam tshuam loj rau lawv qhov kev ua tau zoo. Yog li ntawd, thaum xaiv thiab siv cov roj teeb lithium-ion, nws yog ib qho tsim nyog yuav tsum xav txog qhov voltage thiab xaiv cov roj teeb uas tsim nyog thiab cov lus qhia tshwj xeeb raws li qhov xav tau tiag tiag thiab cov ntawv thov scenarios. Lub caij no, kev saib xyuas yuav tsum tau them rau qhov ntsuas hluav taws xob ntawm lub roj teeb thaum siv kom ntseeg tau tias nws muaj kev nyab xeeb thiab ruaj khov.