Lithium Ion Battery Protection Measures

Tom qab lub lithium roj teeb ntawm tes yog overcharged mus rau ib tug voltage siab tshaj 4.2V, cov kev mob tshwm sim yuav pib tshwm sim. Qhov siab dua qhov overcharge voltage, qhov kev pheej hmoo siab dua. Thaum qhov hluav taws xob ntawm lithium roj teeb ntawm tes siab dua 4.2V, tsawg dua li ib nrab ntawm cov lithium atoms nyob hauv cov khoom siv cathode. Nyob rau lub sijhawm no, lub cell cia feem ntau poob, uas ua rau lub roj teeb muaj peev xwm poob mus tas li. Yog tias kev them nyiaj txuas ntxiv, txij li lub cell cia ntawm qhov tsis zoo electrode tau ntim nrog lithium atoms, cov lithium hlau tom ntej yuav ntim rau ntawm cov khoom tsis zoo electrode. Cov lithium atoms no yuav loj hlob dendritic crystals los ntawm qhov chaw tsis zoo mus rau kev coj ntawm lithium ions. Cov pob zeb lithium hlau no yuav dhau los ntawm daim ntawv diaphragm thiab luv luv rau qhov zoo thiab tsis zoo electrodes. Qee zaum, lub roj teeb yuav tawg ua ntej qhov luv luv tshwm sim. Qhov no yog vim hais tias thaum lub sij hawm overcharge txheej txheem, electrolyte thiab lwm yam ntaub ntawv yuav tawg los tsim cov roj, uas ua rau lub roj teeb lub plhaub los yog lub siab valve bulge thiab tawg, tso cai rau oxygen nkag mus rau thiab reacts nrog lithium atoms accumulated nyob rau hauv qhov chaw tsis zoo, thiab ces tawg. Yog li ntawd, thaum them lub roj teeb lithium, lub siab voltage txwv yuav tsum tau teem kom coj mus rau hauv tus account lub roj teeb lub neej, muaj peev xwm thiab kev nyab xeeb. Qhov zoo tshaj plaws txwv sab sauv ntawm them voltage yog 4.2V. Tseem yuav tsum muaj qhov txwv qis dua thaum lub lithium roj teeb ntawm tes raug tso tawm. Thaum lub cell voltage qis dua 2.4V, qee cov ntaub ntawv yuav pib puas. Txij li thaum lub roj teeb yuav tso tawm nws tus kheej, qhov ntev nws tawm, qhov voltage yuav qis dua. Yog li ntawd, nws yog qhov zoo tshaj kom tsis txhob nres ntawm 2.4V thaum tso tawm. Thaum lub sij hawm txij li 3 mus rau 3. Yog li ntawd, 3.

Thaum them nyiaj thiab tso tawm, ntxiv rau qhov txwv tsis pub muaj hluav taws xob, kev txwv tam sim no kuj tseem tsim nyog. Thaum qhov tam sim no loj dhau lawm, lithium ions tsis muaj sijhawm nkag mus rau hauv lub cell cia thiab yuav sib sau ua ke ntawm cov khoom siv. Tom qab cov lithium ions tau txais hluav taws xob, lithium atoms yuav crystallize rau ntawm cov khoom siv, uas yog tib yam li overcharge, uas yuav ua rau muaj kev phom sij. 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 muaj tsawg kawg yog peb yam: sab sauv txwv ntawm kev them nqi hluav taws xob, qis qis ntawm qhov hluav taws xob tawm, thiab qhov txwv siab tshaj ntawm tam sim no. Feem ntau, nyob rau hauv lub lithium roj teeb pob, tshwj tsis yog rau lub lithium roj teeb ntawm tes, yuav muaj ib tug tiv thaiv phaj, uas mas muab peb kev tiv thaiv. Txawm li cas los xij, peb qhov kev tiv thaiv ntawm cov phaj tiv thaiv no pom tseeb tsis txaus. Lithium roj teeb tawg tseem nquag nyob thoob ntiaj teb. Txhawm rau kom muaj kev nyab xeeb ntawm lub roj teeb system, qhov ua rau lub roj teeb tawg yuav tsum tau soj ntsuam kom zoo dua.