Lithium roj teeb overcharge mechanism thiab tiv thaiv overcharge ntsuas (1)

Kev them nyiaj ntau dhau yog ib qho nyuaj tshaj plaws hauv kev ntsuas kev nyab xeeb ntawm lithium roj teeb tam sim no, yog li nws yuav tsum nkag siab txog cov txheej txheem ntawm kev them nyiaj ntau dhau thiab kev ntsuas tam sim no los tiv thaiv overcharging.

Daim duab 1 yog qhov voltage thiab kub nkhaus ntawm NCM + LMO / Gr system roj teeb thaum nws yog overcharged.Qhov hluav taws xob nce mus txog qhov siab tshaj plaws ntawm 5.4V, thiab tom qab ntawd qhov hluav taws xob poob, nws thiaj li ua rau thermal khiav tawm.Qhov voltage thiab kub nkhaus ntawm lub overcharge ntawm lub roj teeb ternary zoo ib yam li nws.

ib 1

Thaum lub roj teeb lithium yog overcharged, nws yuav ua kom sov thiab roj.Lub tshav kub muaj xws li ohmic tshav kub thiab tshav kub uas tsim los ntawm sab kev tshwm sim, ntawm uas ohmic tshav kub yog lub ntsiab.Cov tshuaj tiv thaiv sab ntawm lub roj teeb uas tshwm sim los ntawm overcharging yog thawj zaug uas tshaj lithium tau muab tso rau hauv qhov tsis zoo electrode, thiab lithium dendrites yuav loj hlob ntawm qhov tsis zoo electrode (N / P piv yuav cuam tshuam rau thawj SOC ntawm lithium dendrite kev loj hlob).Qhov thib ob yog tias cov lithium ntau dhau tau muab rho tawm los ntawm cov khoom siv hluav taws xob zoo, ua rau cov qauv ntawm cov khoom zoo electrode vau, tso cua sov thiab tso pa tawm.Oxygen yuav ua rau kom lub decomposition ntawm electrolyte, lub siab sab hauv ntawm lub roj teeb yuav nce ntxiv, thiab kev nyab xeeb valve yuav qhib tom qab ib theem.Kev sib cuag ntawm cov khoom siv nrog huab cua ntxiv ua kom muaj cua sov ntxiv.

Cov kev tshawb fawb tau pom tias txo cov electrolyte yuav txo tau cov cua sov thiab roj ntau thaum lub sij hawm overcharging.Tsis tas li ntawd, nws tau kawm tias thaum lub roj teeb tsis muaj splint lossis lub valve kev nyab xeeb tsis tuaj yeem qhib ib txwm thaum lub sijhawm them dhau, lub roj teeb muaj qhov tawg.

Kev them nyiaj me me yuav tsis ua rau thermal khiav tawm, tab sis yuav ua rau muaj peev xwm ploj mus.Txoj kev tshawb nrhiav pom tias thaum lub roj teeb nrog NCM / LMO hybrid cov khoom siv raws li qhov zoo electrode yog overcharged, tsis muaj qhov pom tseeb muaj peev xwm lwj thaum SOC qis dua 120%, thiab lub peev xwm yuav ploj mus thaum SOC siab dua 130%.

Tam sim no, muaj ntau txoj hauv kev los daws qhov teeb meem overcharge:

1) Kev tiv thaiv hluav taws xob tau teeb tsa hauv BMS, feem ntau qhov kev tiv thaiv hluav taws xob qis dua qhov siab tshaj qhov hluav taws xob thaum lub sij hawm overcharging;

2) Txhim kho lub overcharge tsis kam ntawm lub roj teeb los ntawm kev hloov khoom siv (xws li cov khoom siv txheej);

3) Ntxiv cov tshuaj tiv thaiv overcharge, xws li redox khub, rau cov electrolyte;

4) Nrog rau kev siv hluav taws xob-rhiab membrane, thaum lub roj teeb yog overcharged, lub membrane kuj txo qis, uas ua raws li ib tug shunt;

5) OSD thiab CID designs yog siv nyob rau hauv square aluminium plhaub roj teeb, uas yog tam sim no muaj ntau anti-overcharge designs.Lub hnab roj teeb tsis tuaj yeem ua tiav cov qauv zoo sib xws.

Cov ntaub ntawv

Zog Cia Khoom 10 (2018) 246–267

Lub sijhawm no, peb yuav qhia txog qhov hloov pauv thiab qhov kub thiab txias ntawm lithium cobalt oxide roj teeb thaum nws dhau los.Daim duab hauv qab no yog qhov overcharge voltage thiab kub nkhaus ntawm lithium cobalt oxide roj teeb, thiab kab rov tav axis yog tus nqi delithiation.Cov electrode tsis zoo yog graphite, thiab cov kuab tshuaj electrolyte yog EC / DMC.Lub roj teeb muaj peev xwm yog 1.5Ah.Lub charger tam sim no yog 1.5A, thiab qhov kub thiab txias yog qhov kub ntawm lub roj teeb.

ib 2

Zone I

1. Lub roj teeb voltage nce maj mam.Qhov zoo electrode ntawm lithium cobalt oxide delithiates ntau tshaj 60%, thiab hlau lithium yog precipitated rau sab tsis zoo electrode.

2. Lub roj teeb yog bulging, uas tej zaum yuav yog vim muaj kev kub siab oxidation ntawm cov electrolyte ntawm qhov zoo.

3. Qhov kub thiab txias yog qhov ruaj khov nrog qhov nce me ntsis.

Zone II

1. Qhov kub pib maj mam nce.

2. Nyob rau hauv qhov ntau ntawm 80 ~ 95%, qhov impedance ntawm qhov zoo electrode nce, thiab lub zog sab hauv ntawm lub roj teeb nce, tab sis nws txo qis ntawm 95%.

3. Lub roj teeb voltage tshaj 5V thiab ncav cuag qhov siab tshaj plaws.

Zone III

1. Thaum txog 95%, lub roj teeb kub pib nce sai heev.

2. Los ntawm kwv yees li 95%, mus txog ze rau 100%, lub roj teeb voltage poob me ntsis.

3. Thaum qhov kub thiab txias ntawm lub roj teeb mus txog 100 ° C, lub roj teeb hluav taws xob poob qis, uas tuaj yeem tshwm sim los ntawm qhov txo qis hauv lub roj teeb vim qhov kub thiab txias.

Zone IV

1. Thaum qhov kub thiab txias ntawm lub roj teeb yog siab tshaj 135 ° C, PE separator pib yaj, lub zog sab hauv ntawm lub roj teeb nce nrawm, qhov hluav taws xob nce mus txog qhov txwv siab (~ 12V), thiab tam sim no poob qis dua. tus nqi.

2. Nyob nruab nrab ntawm 10-12V, lub roj teeb voltage tsis ruaj khov thiab tam sim no fluctuates.

3. Qhov kub thiab txias sab hauv ntawm lub roj teeb nce nrawm, thiab qhov kub thiab txias nce mus rau 190-220 ° C ua ntej lub roj teeb tawg.

4. Lub roj teeb tawg.

Lub overcharging ntawm ternary roj teeb zoo ib yam li cov roj teeb lithium cobalt oxide.Thaum overcharging ternary roj teeb nrog square aluminium plhaub ntawm lub khw, OSD lossis CID yuav qhib thaum nkag mus rau Zone III, thiab tam sim no yuav raug txiav tawm los tiv thaiv lub roj teeb ntawm overcharging.

Cov ntaub ntawv

Phau ntawv Journal ntawm Electrochemical Society, 148 (8) A838-A844 (2001)


Post lub sij hawm: Dec-07-2022