Yin caji yana ɗaya daga cikin abubuwa mafi wahala a gwajin lafiyar batirin lithium na yanzu, don haka ya zama dole a fahimci tsarin yin caji da kuma matakan da ake bi don hana yin caji.
Hoto na 1 shine ƙarfin wutar lantarki da yanayin zafin batirin tsarin NCM+LMO/Gr lokacin da ya cika caji.Wutar lantarki ya kai matsakaicin 5.4V, sannan wutar lantarki ta ragu, a ƙarshe ya haifar da guduwar thermal.Wutar lantarki da ma'aunin zafin jiki na yawan cajin baturi na ternary suna kama da shi sosai.
Lokacin da baturin lithium ya yi yawa, zai haifar da zafi da gas.Zafin ya haɗa da zafi na ohmic da zafi da aka haifar ta hanyar halayen gefe, wanda zafi na ohmic shine babba.Halin gefen baturin da ya haifar ta hanyar caji da yawa shine da farko cewa an saka lithium da yawa a cikin ƙananan lantarki, kuma lithium dendrites zai yi girma a saman ƙananan lantarki (N/P rabo zai shafi farkon SOC na lithium dendrite girma).Na biyu kuma shi ne cewa ana fitar da sinadarin lithium da ya wuce kima daga ingantacciyar wutar lantarki, wanda hakan ke haifar da rugujewar tsarin na’urar lantarki, ta saki zafi da sakin iskar oxygen.Oxygen zai hanzarta bazuwar electrolyte, matsa lamba na ciki na baturi zai ci gaba da tashi, kuma bawul ɗin aminci zai buɗe bayan wani matakin.Alamar abu mai aiki tare da iska yana kara haifar da ƙarin zafi.
Bincike ya nuna cewa rage yawan electrolyte zai rage yawan zafi da iskar gas a lokacin da ake yin caji.Bugu da ƙari, an yi nazarin cewa lokacin da baturin ba shi da splint ko kuma ba za a iya buɗe bawul ɗin tsaro kamar yadda aka saba yayin caji ba, baturin yana da wuyar fashewa.
Canjin fiye da kima ba zai haifar da guduwar zafi ba, amma zai haifar da raguwar iya aiki.Binciken ya gano cewa lokacin da baturin da ke da kayan haɗin gwiwar NCM/LMO kamar yadda ingantaccen lantarki ya cika caji, babu wani bayyanannen lalata iya aiki lokacin da SOC ya yi ƙasa da 120%, kuma ƙarfin yana raguwa sosai lokacin da SOC ya fi 130%.
A halin yanzu, akwai kusan hanyoyi da yawa don magance matsalar caji mai yawa:
1) Ana saita wutar lantarki na kariya a cikin BMS, yawanci ƙarfin kariya yana ƙasa da mafi girman ƙarfin lantarki yayin caji;
2) Haɓaka juriyar cajin baturi ta hanyar gyare-gyaren kayan aiki (kamar kayan shafa);
3) Ƙara abubuwan da ake ƙara anti-overcharge, kamar redox nau'i-nau'i, zuwa electrolyte;
4) Tare da yin amfani da membrane mai karfin wutar lantarki, lokacin da baturi ya cika cajin, ƙarfin juriya yana raguwa sosai, wanda ke aiki a matsayin shunt;
5) Ana amfani da ƙirar OSD da CID a cikin batura harsashi na aluminum, waɗanda a halin yanzu ƙirar ƙima ce ta gama gari.Baturin jakar ba zai iya cimma irin wannan ƙira ba.
Nassoshi
Kayan Ajiye Makamashi 10 (2018) 246-267
A wannan karon, za mu gabatar da irin ƙarfin lantarki da canjin zafin baturin lithium cobalt oxide lokacin da aka cika shi.Hoton da ke ƙasa shine ƙarfin wutar lantarki da yanayin zafi na baturin lithium cobalt oxide, kuma axis a kwance shine adadin lalata.Wutar lantarki mara kyau ita ce graphite, kuma sauran ƙarfi na electrolyte shine EC/DMC.Iyakar baturi shine 1.5Ah.Cajin halin yanzu shine 1.5A, kuma zazzabi shine zafin ciki na baturi.
Zone I
1. Wutar lantarki yana tashi a hankali.Ingantacciyar wutar lantarki ta lithium cobalt oxide tana lalata fiye da 60%, kuma lithium na ƙarfe yana haɗe a gefen gurɓataccen lantarki.
2. Baturin yana ƙumburi, wanda zai iya kasancewa saboda matsanancin oxidation na electrolyte a gefen tabbatacce.
3. A zafin jiki ne m barga tare da kadan Yunƙurin.
Yanki II
1. Zazzabi yana farawa sannu a hankali.
2. A cikin kewayon 80 ~ 95%, rashin daidaituwa na ingantaccen lantarki yana ƙaruwa, kuma juriya na ciki na baturi yana ƙaruwa, amma yana raguwa a 95%.
3. Ƙarfin baturi ya wuce 5V kuma ya kai iyakar.
Yanki na III
1. A kusan 95%, zafin baturi yana farawa da sauri.
2. Daga kusan 95%, har zuwa kusan 100%, ƙarfin baturi yana raguwa kaɗan.
3. Lokacin da zafin ciki na baturin ya kai kimanin 100 ° C, ƙarfin baturi yana raguwa sosai, wanda zai iya faruwa saboda raguwar juriya na ciki na baturin saboda karuwar zafin jiki.
Yanki IV
1. Lokacin da zafin jiki na ciki na baturi ya fi girma fiye da 135 ° C, mai rarraba PE ya fara narkewa, juriya na ciki na baturi ya tashi da sauri, ƙarfin lantarki ya kai iyakar (~ 12V), kuma halin yanzu ya ragu zuwa ƙananan. darajar.
2. Tsakanin 10-12V, ƙarfin baturi ba shi da kwanciyar hankali kuma halin yanzu yana canzawa.
3. Zazzabi na ciki na baturin yana tashi da sauri, kuma zafin jiki yana tashi zuwa 190-220C kafin baturin ya rushe.
4. Baturi ya karye.
Yawan cajin batura na ternary yayi kama da na batirin lithium cobalt oxide.Lokacin da ake yin cajin baturi mai girma tare da harsashi mai murabba'in aluminium a kasuwa, OSD ko CID za a kunna lokacin shiga Zone III, kuma za a yanke na yanzu don kare baturin daga yin caji.
Nassoshi
Jaridar The Electrochemical Society, 148 (8) A838-A844 (2001)
Lokacin aikawa: Dec-07-2022