Abubuwan da ke shafar ƙarfin fitarwa na PACK na batirin lithium-ion

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Batir Lithium ion PACK wani muhimmin samfuri ne wanda ke gudanar da gwajin aikin lantarki bayan nunawa, haɗawa, haɗawa da haɗuwa da tantanin halitta, kuma yana ƙayyade ko iyawa da bambancin matsa lamba sun cancanci.

Tsarin baturi-daidaitacce monomer shine daidaito tsakanin zuwa la'akari na musamman a cikin PACK ɗin baturi, kawai suna da iya aiki mai kyau, yanayin caji, kamar juriya na ciki, daidaiton fitar da kai za a iya cimma don kunnawa da saki, ƙarancin baturi idan daidaito mara kyau na iya tasiri sosai. Duk aikin baturi, har ma da sanadin caji ko yin caji wanda hakan ke haifar da amintaccen ɓoyayyiyar matsala.Hanyar abun ciki mai kyau shine hanya mai mahimmanci don inganta daidaiton monomer.

Baturin lithium ion an iyakance shi ta yanayin zafi, tsayi ko ƙananan zafin jiki zai shafi ƙarfin baturi.Za a iya shafar rayuwar sake zagayowar baturin idan baturin yana aiki a babban zafin jiki na dogon lokaci.Idan zafin jiki ya yi ƙasa sosai, ƙarfin zai yi wahala a yi wasa.Adadin fitarwa yana nuna ƙarfin baturin na caji da fitarwa a babban halin yanzu.Idan adadin fitarwa ya yi ƙanƙanta, saurin caji da fitarwa yana jinkirin, wanda ke shafar ingancin gwajin.Idan adadin ya yi girma da yawa, za a rage ƙarfin saboda tasirin polarization da tasirin zafi na baturi, don haka ya zama dole don zaɓar cajin da ya dace da ƙimar fitarwa.

1. Daidaituwar daidaitawa

Kyakkyawan tsari ba zai iya inganta ƙimar amfani da tantanin halitta kawai ba, har ma yana sarrafa daidaiton tantanin halitta, wanda shine tushen samun ingantaccen iya fitarwa da kwanciyar hankali na fakitin baturi.Koyaya, matakin tarwatsawa na AC impedance zai ƙara ƙaruwa a yanayin ƙarancin ƙarfin baturi, wanda zai raunana aikin sake zagayowar da samun damar fakitin baturi.An gabatar da hanyar daidaita baturi dangane da sifar sifa na batura.Wannan nau'in sifa yana nuna kamance tsakanin bayanan caji da fitar da wutar lantarki na baturi guda da na daidaitaccen baturi.Matsakaicin madaidaicin ma'aunin cajin baturi shine mafi girman kamanceninta, kuma mafi kusancin ma'aunin daidaitawa shine 1. Wannan hanyar ta dogara ne akan ma'aunin wutar lantarki na monomer, haɗe da sauran sigogi zuwa cimma kyakkyawan sakamako.Wahalhalun da wannan hanyar ita ce samar da madaidaicin fasalin fasalin baturi.Saboda matsalolin matakin samarwa, tabbas akwai bambance-bambance tsakanin sel da aka samar a kowane rukuni, kuma yana da matukar wahala a sami sifa mai siffa wacce ta dace da kowane rukuni.

Anyi amfani da ƙididdigar ƙididdiga don nazarin hanyar tantance bambancin tsakanin sel guda.Da fari dai, an fitar da mahimman abubuwan da ke shafar aikin baturi ta hanyar ilimin lissafi, sannan kuma an aiwatar da abstraction na lissafi don gane cikakkiyar ƙima da kwatancen aikin baturi.An rikitar da ƙididdige ƙididdiga na aikin baturi zuwa ƙididdige ƙididdiga, kuma an gabatar da hanya mai sauƙi mai amfani don mafi kyawun rabon aikin baturi.An gabatar da shi bisa tsarin zaɓin tantanin halitta na cikakken tsarin kimanta aikin aiki, zai zama darajar Delphi na darajar launin toka da ma'auni na haƙiƙa, an kafa tsarin daidaita nau'ikan nau'ikan batir mai launin toka, da kuma shawo kan yanayin gefe ɗaya na fihirisar guda ɗaya azaman ƙimar kimantawa, aiwatarwa. aikin kimanta nau'in wutar lantarki na batirin lithium ion baturi, Matsayin daidaitawa da aka samu daga sakamakon kimantawa yana ba da ingantaccen tushen ka'idar don zaɓi na gaba da rarraba batura.

Muhimman halaye masu ƙarfi tare da hanyar rukuni shine gwargwadon cajin baturi da madaidaicin fitarwa don cimma aikin tare da rukuni, ƙayyadaddun aiwatar da aikin sa shine cire alamar sifa akan lanƙwasa, da farko don samar da sifa mai sifa, bisa ga kowane lanƙwasa tsakanin nisa. tsakanin sifa vector don saitin alamomi, ta hanyar zabar algorithms masu dacewa don gane rarrabuwa na lanƙwasa, sannan kammala baturi na tsarin rukuni.Wannan hanya tana la'akari da bambancin aikin baturi a cikin aiki.A kan wannan, ana zaɓar wasu sigogin da suka dace don aiwatar da daidaitawar baturi, kuma ana iya daidaita baturin da ke da daidaiton aiki.

2. Hanyar caji

Tsarin caji mai dacewa yana da tasiri mai mahimmanci akan ƙarfin fitarwa na batura.Idan zurfin caji yayi ƙasa, ƙarfin fitarwa zai ragu daidai.Idan zurfin caji ya yi ƙasa da ƙasa, abubuwan da ke aiki da sinadarai na baturin za su yi tasiri kuma za a haifar da lalacewa mara jurewa, rage ƙarfi da rayuwar baturin.Don haka, yakamata a zaɓi ƙimar cajin da ta dace, ƙarfin ƙarfin babba da ƙimar ƙarancin wutar lantarki na yau da kullun don tabbatar da cewa ana iya samun ƙarfin caji, yayin inganta ingantaccen caji da aminci da kwanciyar hankali.A halin yanzu, batirin lithium ion baturi galibi yana ɗaukar yanayin caji na yau da kullun - na yau da kullun.Ta hanyar nazarin sakamakon cajin da akai-akai da akai-akai na tsarin lithium iron phosphate system da batura tsarin ternary a ƙarƙashin nau'ikan caji daban-daban da nau'ikan wutar lantarki daban-daban, ana iya ganin cewa.:(1) lokacin da cajin yanke wutar lantarki ya kasance akan lokaci, cajin halin yanzu yana ƙaruwa, rabo na yau da kullun yana raguwa, lokacin caji yana raguwa, amma yawan kuzari yana ƙaruwa;(2) Lokacin da cajin halin yanzu ya kasance akan lokaci, tare da raguwar cajin yanke-kashe ƙarfin lantarki, ƙimar caji na yau da kullun yana raguwa, ƙarfin caji da kuzari duka suna raguwa.Domin tabbatar da ƙarfin baturi, cajin yanke-kashe ƙarfin lantarki na baturin phosphate na lithium bai kamata ya zama ƙasa da 3.4V ba.Don daidaita lokacin caji da asarar kuzari, zaɓi lokacin cajin da ya dace da lokacin yankewa.

Daidaiton SOC na kowane monomer ya fi ƙayyade ƙarfin fitarwa na fakitin baturi, kuma daidaitaccen caji yana ba da damar gane kamanni na dandalin SOC na farko na kowane fitarwa na monomer, wanda zai iya inganta ƙarfin fitarwa da ingantaccen fitarwa (ƙarar fitarwa / iyawar daidaitawa). ).Yanayin daidaitawa a cikin caji yana nufin ma'auni na baturin lithium ion wuta a tsarin caji.Gabaɗaya yana farawa daidaitawa lokacin da ƙarfin lantarki na fakitin baturi ya kai ko ya fi ƙarfin da aka saita, kuma yana hana yin caji ta hanyar rage cajin halin yanzu.

Dangane da jihohi daban-daban na sel guda ɗaya a cikin fakitin baturi, an gabatar da madaidaitan dabarun sarrafa caji don gane saurin caji na fakitin baturi tare da kawar da tasirin sel guda ɗaya marasa daidaituwa akan zagayowar fakitin baturin ta hanyar daidaita cajin. halin yanzu na kowane sel ta hanyar daidaitaccen tsarin kula da caji na fakitin baturi.Musamman, ana iya ƙara ƙarfin baturin lithium ion gaba ɗaya zuwa baturi ɗaya ta hanyar canza sigina, ko kuma ana iya canza ƙarfin baturin ɗaya zuwa fakitin baturi gabaɗaya.Yayin cajin kirtan baturi, tsarin daidaitawa yana duba ƙarfin kowace baturi.Lokacin da ƙarfin lantarki ya kai wani ƙima, ƙirar daidaitawa ta fara aiki.Ana kashe cajin halin yanzu a cikin baturi guda don rage ƙarfin caji, kuma ana mayar da makamashin zuwa bas ɗin caji ta hanyar ƙirar don canzawa, don cimma manufar daidaitawa.

Wasu mutane sun gabatar da mafita na daidaita cajin bambancin.Manufar daidaita wannan hanya ita ce ƙarin makamashi ne kawai ake bayarwa ga tantanin halitta guda ɗaya tare da ƙarancin kuzari, wanda ke hana aiwatar da fitar da makamashin tantanin halitta tare da babban makamashi, wanda ke sauƙaƙa da yanayin yanayin yanayin daidaitawa.Wato, ana amfani da ƙimar caji daban-daban don cajin baturi ɗaya tare da jihohin makamashi daban-daban don cimma kyakkyawan sakamako mai kyau.

3. Yawan fitarwa

Adadin fitarwa shine mahimmin mahimmin mahimmin baturi na lithium ion nau'in wuta.Babban adadin fitarwa na baturi gwaji ne na kayan lantarki masu inganci da mara kyau da kuma electrolyte.Amma ga lithium baƙin ƙarfe phosphate, yana da tsayayye tsari, kananan iri a lokacin caji da fitarwa, kuma yana da asali yanayi na babban halin yanzu fitarwa, amma maras kyau al'amari shi ne matalauta conductivity na lithium iron phosphate.Adadin yaduwa na lithium ion a cikin electrolyte wani muhimmin abu ne da ke shafar adadin fitar da baturi, kuma yaduwar ion a cikin baturi yana da alaƙa ta kud-da-kud da tsari da tattarawar baturi.

Don haka, adadin fitarwa daban-daban yana haifar da lokacin fitarwa daban-daban da kuma fitar da dandamalin wutar lantarki na batura, wanda ke haifar da ƙarfin fitarwa daban-daban, musamman ga batura masu daidaitawa.Don haka, yakamata a zaɓi adadin fitarwa da ya dace.Ƙarfin da ake samu na baturin yana raguwa tare da karuwar fitarwa na halin yanzu.

Jiang Cuina da dai sauransu don nazarin fitarwa kudi na baƙin ƙarfe phosphate lithium-ion baturi monomer iya sallama iya aiki, da tasiri na wani sa na iri guda na farko daidaito mafi alhẽri monomer baturi ne a 1 c halin yanzu cajin zuwa 3.8 V, sa'an nan bi da bi da 0.1, 0.2, 0.5, 1, 2, 3 c yawan fitarwa na fitarwa zuwa 2.5 V, rikodin alaƙar da ke tsakanin ƙarfin wutar lantarki da wutar lantarki, Duba Hoto 1. Sakamakon gwaji ya nuna cewa ƙarfin da aka saki na 1 da 2C shine 97.8% da 96.5 % na ƙarfin da aka saki na C/3, kuma makamashin da aka fitar shine 97.2% da 94.3% na makamashin da aka fitar na C/3, bi da bi.Ana iya ganin cewa tare da haɓakar fitarwa na halin yanzu, ƙarfin da aka saki da ƙarfin batirin lithium ion da aka saki yana raguwa sosai.

A cikin fitar da batirin lithium ion, ana zabar ma'auni na ƙasa gabaɗaya 1C, kuma matsakaicin fitarwa yawanci ana iyakance shi zuwa 2 ~ 3C.Lokacin da ake fitarwa tare da babban halin yanzu, za a sami hauhawar yawan zafin jiki da asarar kuzari.Don haka, saka idanu zafin zafin igiyoyin baturi a ainihin lokacin don hana lalacewar baturi da rage rayuwar baturi.

4. Yanayin zafi

Zazzabi yana da tasiri mai mahimmanci akan ayyukan kayan lantarki da aikin lantarki a cikin baturi.Maɗaukakin baturi yana da matukar tasiri ta babban ko ƙarancin zafin jiki.

A cikin ƙananan zafin jiki, aikin baturi yana raguwa sosai, ikon ƙaddamarwa da saki lithium yana raguwa, juriya na ciki na baturi da haɓaka ƙarfin polarization, ainihin ƙarfin da ake samuwa yana raguwa, ƙarfin fitarwa na baturi ya ragu. dandamalin fitarwa yana da ƙasa, baturi ya fi sauƙi don isa wutar lantarki mai yanke fitarwa, wanda ke bayyana yayin da ƙarfin baturi ya ragu, ƙarfin amfani da ƙarfin baturi yana raguwa.

Yayin da zafin jiki ya tashi, ions lithium suna fitowa kuma suna haɗawa tsakanin ingantattun sanduna masu kyau da marasa kyau suna aiki, don haka juriya na ciki na baturi yana raguwa kuma lokacin riko ya zama tsayi, wanda ke ƙara motsin bandeji na lantarki a cikin kewayen waje kuma yana sa ƙarfin ya fi tasiri.Duk da haka, idan baturin yana aiki a babban zafin jiki na dogon lokaci, kwanciyar hankali na ingantaccen tsarin lattice zai zama mafi muni, za a rage lafiyar baturin, kuma rayuwar baturin za ta ragu sosai.

Zhe Li et al.yayi nazarin tasirin zafin jiki akan ainihin ƙarfin cajin batura, kuma ya rubuta adadin ainihin ƙarfin cajin batir zuwa daidaitaccen ƙarfin cajin (1C fitarwa a 25 ℃) a yanayin zafi daban-daban.Daidaita ƙarfin baturi tare da zafin jiki, zamu iya samun: inda: C shine ƙarfin baturi;T shine zafin jiki;R2 shine ma'aunin daidaitawa na dacewa.Sakamakon gwaji ya nuna cewa ƙarfin baturi yana ruɓe da sauri a ƙananan zafin jiki, amma yana ƙaruwa tare da karuwar zafin jiki a dakin da zafin jiki.The ƙarfin baturi a -40 ℃ ne kawai daya bisa uku na maras muhimmanci darajar, yayin da a 0 ℃ zuwa 60 ℃, da damar baturi yakan daga 80 bisa dari na maras muhimmanci iya aiki zuwa 100 bisa dari.

Binciken ya nuna cewa yawan canjin juriya na ohmic a ƙananan zafin jiki ya fi girma fiye da yadda yake a babban zafin jiki, wanda ke nuna cewa ƙananan zafin jiki yana da tasiri mai mahimmanci akan aikin baturi, don haka za'a iya saki baturin.Tare da haɓakar zafin jiki, juriya na ohmic da juriya na polarization na caji da tsarin fitarwa yana raguwa.Duk da haka, a yanayin zafi mafi girma, ma'aunin halayen sinadaran da kwanciyar hankali na abu a cikin baturi za a lalata, haifar da yiwuwar halayen gefe, wanda zai shafi iya aiki da juriya na ciki na baturin, yana haifar da raguwar rayuwar zagayowar har ma da rage aminci.

Saboda haka, duka babban zafin jiki da ƙananan zafin jiki zai shafi aiki da rayuwar sabis na baturin phosphate na lithium baƙin ƙarfe.A cikin ainihin tsarin aiki, ya kamata a ɗauki sabbin hanyoyi kamar sarrafa zafin baturi don tabbatar da cewa baturin yana aiki a yanayin zafin da ya dace.Za a iya kafa ɗakin gwajin zafin jiki akai-akai na 25 ℃ a cikin mahaɗin gwajin PACK na baturi.

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Lokacin aikawa: Fabrairu-21-2022