Nrog rau txoj kev loj hlob sai ntawm lub zog tshiab tsheb thiab lub zog cia technologies, lithium{0}} ion roj teeb, raws li lub hauv paus fais fab, yeej ib txwm yog ib tug focal point ntawm kev txhawj xeeb rau cov neeg siv khoom thiab kev lag luam. Ntawm cov kev qhia tseem ceeb, NCM (Nickel-Cobalt-Manganese, ternary) lithium-ion roj teeb thiab LFP (Lithium Iron Phosphate) lithium-ion roj teeb muaj qhov sib txawv tseem ceeb hauv kev nyab xeeb. Kab lus no yuav ua kom pom kev sib piv ntawm ob los ntawm ntau qhov ntev, suav nrog cov yam ntxwv ntawm cov khoom siv, thermal stability, mechanical kev nyab xeeb, kev siv cov xwm txheej, thiab kev tiv thaiv kev nyab xeeb.
1. Qhov sib txawv ntawm cov yam ntxwv ntawm cov khoom thiab thermal stability
Lub ntsiab kom zoo dua ntawm LFP roj teeb nyob rau hauv cov tshuaj stability ntawm lawv cov khoom cathode, Lithium Iron Phosphate (LiFePO₄). Cov khoom no muaj qhov decomposition kub txog li 800℃nyob rau hauv qhov kub thiab txias thiab tsuas emissions pa luam yeeb yam tsis muaj hluav taws nyob rau hauv huab mob xws li ntsia thawv nkag thiab overcharging, qhia tau zoo heev tiv thaiv thermal runaway. Piv txwv li, BYD's Blade Battery tau txhim kho nws qhov ntim siv los ntawm 50% los ntawm kev ua kom zoo dua qub, txo qis qhov sib txawv nrog NCM roj teeb thaum tswj kev nyab xeeb.
Hauv qhov sib piv, cov khoom siv cathode ntawm NCM roj teeb (xws li NCM lossis NCA) muaj cov khoom siv hlau zoo li npib tsib xee thiab cobalt, uas tuaj yeem raug thermal khiav ntawm ib ncig ntawm 250℃thiab tso tawm oxygen thaum lub sij hawm decomposition, exacerbating combustion txaus ntshai. Txawm hais tias kev saws me nyuam ntawm high-nickel thiab qis-cobalt (xws li, NCMA quaternary) roj teeb thiab khoom siv-lub xeev electrolyte thev naus laus zis tuaj yeem txo qee qhov kev pheej hmoo, lawv cov yam ntxwv ntawm cov khoom siv tseem ceeb tseem txiav txim siab tias lawv cov thermal stability tsis muaj zog dua li ntawm LFP roj teeb.
2. Mechanical Safety and Practical Application Risks
Hauv kev ntsuam xyuas kev cuam tshuam, LFP cov roj teeb muaj zog tiv thaiv kev puas tsuaj. Kev ntsuam xyuas cov ntsia hlau pom tau tias NCM roj teeb tuaj yeem ncav cuag qhov kub siab tshaj ntawm 400-600℃hauv 10 vib nas this, thaum LFP roj teeb siv sijhawm li 2 feeb kom ncav cuag 300 degree. Qhov sib txawv no tshwm sim los ntawm cov qauv olivine ntawm cov khoom siv LFP, uas nws cov qauv siv lead ua tsis tshua muaj kev cuam tshuam rau sab nraud quab yuam, txo qis qhov tshwm sim ntawm cov khoom siv luv luv.
Hauv kev siv cov tswv yim, LFP roj teeb tau dav siv hauv tsheb npav hluav taws xob thiab tsheb lag luam. Piv txwv li, qee cov qauv BYD ua tiav lub neej ua haujlwm ntev ntawm 8-10 xyoo thiab cov nqi kho qis los ntawm kev ua kom zoo dua cov qauv roj teeb. Ntawm qhov tod tes, vim lawv lub zog muaj zog, NCM roj teeb feem ntau yog siv rau hauv siab - cov neeg caij tsheb kawg tab sis cia siab rau cov txheej txheem thermal tswj kom tswj tau qhov kub thiab txias. Piv txwv li, Tesla's 4680 roj teeb txo luv luv- Circuit Court txaus ntshai los ntawm kev tsim tab-tsawg thiab tau nruab nrog lub tshuab ua kua txias kom tswj tau qhov kev ua haujlwm zoo.
3. Tsawg-Kev Ua Haujlwm Kub thiab Kev Hloov Kho rau Ib puag ncig hnyav
NCM roj teeb muaj qhov zoo tshaj plaws nyob rau hauv qis - qhov kub thiab txias ib puag ncig. Ntawm -20 degree, lawv lub peev xwm tuav tau ntau dua 70%, thaum lub roj teeb LFP poob mus txog 60%. Qhov sib txawv no yog vim qhov txo qis hauv ion kev txav mus los ntawm cov electrolyte hauv NCM roj teeb ntawm qhov kub thiab txias thiab ntau dua ntawm lawv cov khoom siv electrode. Piv txwv li, Zeekr 001 ua tiav qhov kev ua tau zoo ntawm 65% hauv kev ntsuas lub caij ntuj no, thaum qee cov qauv LFP tsuas yog ua tiav 50%.
Txawm li cas los xij, qhov kub siab - ib puag ncig kub ua rau muaj teeb meem loj dua rau NCM roj teeb. Nyob rau hauv tshav ntuj ncaj qha nyob rau lub caij ntuj sov, NCM roj teeb yuav tsum tsis txhob siv ib txhij ntawm kev them nyiaj ceev thiab kub siab, uas yuav ua rau thermal khiav. Hauv qhov sib piv, LFP roj teeb tuaj yeem siv nrog kev ntseeg siab hauv siab - qhov kub thiab txias ib puag ncig vim lawv qhov kub siab decomposition. Piv txwv li, BYD Han EV ua haujlwm ruaj khov hauv cov cheeb tsam yav qab teb yam tsis muaj kev tswj xyuas thermal ntxiv.
4. Kev Tiv Thaiv Kev Tiv Thaiv Kev Nyab Xeeb thiab Cov Txheej Txheem Txheej Txheem
Niaj hnub nimno lithium-ion roj teeb tiv thaiv kev nyab xeeb tau hloov zuj zus mus rau hauv ntau- txheej txheej. LFP roj teeb cia siab rau Battery Management Systems (BMS) los saib xyuas qhov voltage, tam sim no, thiab qhov kub thiab txias hauv lub sijhawm tiag tiag -. Piv txwv li, NIO's Baas kev pab cuam txo qis - qhov kub tsis txaus los ntawm cov roj teeb ua ntej cua sov thaum siv lub neej ntev ntawm LFP roj teeb (dhau 3000 cycles) kom txo tau qhov zaus hloov.
NCM roj teeb, ntawm qhov tod tes, nyob ntawm seb BMS ntse dua thiab kev tsim kho tshiab. Piv txwv li, CATL's NCM811 roj teeb txo cov kev pheej hmoo los ntawm siab - cov roj teeb muaj zog thiab kev tswj xyuas thermal, thaum Tesla's 4680 roj teeb siv lub tab-tsim tsim kom txo qis - qhov tshwm sim ntawm qhov hluav taws xob. Tsis tas li ntawd, manganese-raws li doping thev naus laus zis rau LFP roj teeb (xws li Lithium Manganese Iron Phosphate) tuaj yeem ua kom lub zog ntom ntom rau 200Wh / kg, thaum lub siab -nickel thiab qis-cobalt (xws li, NCMA quaternary) mus kom ze rau NCM roj teeb. Txoj kev sib txawv hauv kev tiv thaiv kev nyab xeeb ntawm ob qhov cuam tshuam txog lawv txoj kev xav tsim qauv: LFP roj teeb tseem ceeb rau cov khoom ruaj khov, thaum NCM roj teeb hais txog kev sib koom ua ke.
5. Cov xwm txheej ntawm daim ntawv thov thiab kev txiav txim siab rau cov neeg siv khoom-Cov lus pom zoo
Thaum xaiv ntawm hom roj teeb, cov neeg siv khoom yuav tsum ua tib zoo xav txog lawv cov xwm txheej thiab kev xav tau. Yog tias nyob hauv thaj chaw txias sab qaum teb lossis nrhiav qhov ntev, NCM roj teeb yog qhov kev xaiv zoo dua; Yog hais tias nyob rau hauv cov cheeb tsam kub yav qab teb los yog qhov tseem ceeb ntawm kev nyab xeeb thiab tus nqi, LFP roj teeb muaj txiaj ntsig zoo dua. Piv txwv li, Wuling Hongguang MINI EV tau txais LFP roj teeb rau tus nqi- kev ua tau zoo, thaum Tesla Model Y Long Range version tso siab rau NCM roj teeb kom muaj zog ceev.
In daily use, both types of batteries should avoid overcharging (>95%), tshaj - tso tawm (<5%), and extreme temperatures (>50℃los yog<-30°C). LFP batteries can be used "roughly" but should prevent long-term deep discharging; NCM batteries require "meticulous care," with strict control over charging limits and fast-charging frequency. It is recommended to check the battery's State of Health (SOH) annually through the BMS. If the capacity of an LFP battery drops sharply, it may indicate a single-cell fault, requiring professional inspection.
6. Cov ntsiab lus ntawm kev sib piv kev nyab xeeb thiab yav tom ntej Outlook
LFP roj teeb zoo tshaj hauv thermal stability, mechanical kev nyab xeeb, thiab tus nqi, ua rau lawv haum rau cov xwm txheej uas yuav tsum tau muaj kev nyab xeeb siab. NCM batteries, on the other hand, stand out in energy density and low-temperature performance, catering to high-end passenger vehicles and cold regions. Nrog rau kev txhim kho thev naus laus zis, qhov sib txawv ntawm ob yog nqaim. Piv txwv li, CATL's Shenxing Superfast Charging Battery enables LFP roj teeb kom ua tiav "them rau 5 feeb, tsav tsheb tshaj 520 mais," thaum siab -nickel thiab qis-cobalt technologies txo tus nqi ntawm NCM roj teeb.
Yav tom ntej, roj teeb thev naus laus zis tuaj yeem hloov mus rau "hybrid" cov kev daws teeb meem, xws li kev sib xyaw ua ke ntawm pem hauv ntej -axle NCM thiab rear-axle LFP roj teeb hauv Li Auto MEGA, ntsuas kev ua tau zoo thiab tus nqi. Cov neeg siv khoom yuav tsum ntsuas kev nyab xeeb, ntau yam, tus nqi, thiab lwm yam raws li lawv cov kev xav tau tiag tiag thaum xaiv, tsis yog ua raws li kev qhia tshwj xeeb xwb. Nrog kev txawj ntse ntawm kev tswj hwm roj teeb thiab kev sib sib zog nqus ntawm cov khoom siv tshiab, kev nyab xeeb ntawm lithium- ion roj teeb yuav txuas ntxiv txhim kho, muab kev lees paub ntau dua rau kev nrov ntawm cov tsheb tshiab thiab lub zog cia thev naus laus zis.