Ukutshaja ibhetri ye-lithium self-discharge resonance factor kunye nendlela yokulinganisa

作者：Iflowpower – Kaasaskantava elektrijaama tarnija

Eli phepha lichaza imiphumo yezinto ezintle ze-electrode, izinto ezingalunganga ze-electrode, i-electrolytes, kunye neendawo zokugcina kwizinga lokuzikhupha kweebhetri ze-lithium ion. Kwangaxeshanye, yazisa indlela yokulinganisa ibhetri yelithium-ion esetyenziswa ngokuqhelekileyo ngoku kunye nendlela entsha yokulinganisa isantya sokuzikhupha ngokukhawuleza. Ukusuka kwinjineli ye-Guoxuan yobuchwepheshe obuphezulu, bamkele wonke umntu ukuba abelane! I-lithium-ion ibhetri yokuzikhupha i-self-discharge reactions ayinakuthintelwa, kodwa akukho kuphela ukunciphisa ibhetri ngokwayo, kodwa kuchaphazela kakhulu ibhetri okanye ubomi bomjikelezo.

I-self-discharge ratio yebhetri ye-lithium-ion ngokubanzi i-2% ukuya kwi-5% ngenyanga, kwaye inokuhlangabezana ngokupheleleyo neemfuno zebhetri ye-monomer. Nangona kunjalo, xa ibhetri ye-lithium ion idityaniswe kwimodyuli, ngenxa yeempawu zebhetri ye-lithium ion ye-monomer, i-voltage yokuphela kwebhetri ye-lithium ion nganye ayinakuhambelana ngokupheleleyo emva kwentlawulo nganye kunye nokukhutshwa, ukuze ibhetri ye-monomer kwimodyuli yebhetri ye-lithium-ion ibonakala, ukusebenza kwebhetri ye-lithium ion ye-monomer iya kuhla. Njengoko inani lokuhlawuliswa kunye nokukhutshwa liye landa, iqondo lokuwohloka liya kwandisa ngakumbi, kwaye ubomi bomjikelezo buye kwehla kakhulu kunebhetri ye-monomer engasebenziyo.

Ngoko ke, uphando olunzulu malunga nezinga lokuzikhupha kwebhetri ye-lithium ion yimfuno engxamisekileyo yokuvelisa ibhetri. Okokuqala, ukukhutshwa kwe-self-discharge factor battery self-discharge phenomenon ibhekisela kwinto yokulahlekelwa kwebhetri xa ibhetri ijika, kwaye yaziwa ngokuba ngumthamo ohlawulelwayo. Ukuzikhupha ngokuqhelekileyo kunokwahlulwa zibe ziindidi ezimbini: ukuzikhupha okubuyisela umva kunye nokuzikhupha okungenakuguqulwa.

Umthamo welahleko unokubuyiselwa ukubuyisela ukubuyisela ukubuyisela ukukhutshwa ngokwakho, kwaye umgaqo ufana nokuphendula okuqhelekileyo kwebhetri. Umthamo welahleko awukwazi ukufumana imbuyekezo yokuzikhupha ekuzikhupheni okungenakuguqulwa, kwaye sisizathu esibalulekileyo sokuba ngaphakathi kwebhetri kwenzeke inveracted, kubandakanywa i-electrode efanelekileyo kunye ne-electrolyte reaction, isisombululo se-electrolytic electrolytic, impendulo ebangelwa yi-electrolyte autobiosis, kwaye xa kuveliswa Ukusabela okungaguqukiyo okubangelwa yimijikelezo emfutshane ebangelwa bubumdaka. Izinto ezichaphazelayo zokuzikhupha zichazwe ngezantsi.

I-1 Impembelelo yezinto ezilungileyo ze-electrode ibalulekile kukuba i-electrode efanelekileyo ye-transition yensimbi kunye nokungcola kukhutshwe ngokukhawuleza ngaphakathi kwe-electrode precipitation engalunganga, ngaloo ndlela isanda kukhutshwa kwibhetri ye-lithium-ion. Yah-Meiteng et al. Ufunde iimpawu ezibonakalayo kunye ne-electrochemical yezinto ezimbini ezilungileyo ze-LIFEPO4.

Uphononongo lufumene ukuba izinga lokuzikhupha kwi-iron engahlambulukanga kwizinto eziluhlaza kunye nentlawulo kunye nenkqubo yokukhupha yayiphezulu, isizathu kukuba intsimbi yancitshiswa ngokuthe ngcembe yi-electrode engafanelekanga, ibhoboza i-diaphragm, ibangele isiphaluka esifutshane kwibhetri, ngaloo ndlela ibangela ukukhutshwa okuphezulu. I-2 Umphumo wezinto ezingalunganga ze-electrode kwi-self-discharge ibalulekile ngenxa yokuphendula okungenakuguqulwa kwezinto ezimbi ze-electrode kunye ne-electrolyte. Kwangoko ngo-2003, uAurbach et al.

Kucetywayo ukuba i-electrolyte ibuyiselwe kwaye ikhulule igesi, ukwenzela ukuba indawo ye-graphite ibonakale kwi-electrolyte. Ngexesha lokuhlawuliswa kunye nenkqubo yokukhupha, i-lithium ion iyinto engokwemvelo, i-graphite layered structure itshabalaliswa ngokulula, okubangela umlinganiselo omkhulu wokuzikhupha. I-3 Impembelelo yesisombululo se-electrolytic electrolyte: ukubola kwe-electrolyte okanye ukungcola ebusweni be-electrode embi; izinto ze-electrode zichithwa kwi-electrolyte; i-electrode ichithwa yisisombululo se-electrolytic sichithwa yi-insoluble solid or gas ukwenza i-passivation layer, njl.

Okwangoku, inani elikhulu labasebenzi bophando lizibophelele ekuphuhliseni izongezo ezintsha zokuthintela iziphumo ze-electrolyte ekuzikhupheni. Junliu et al. I-MCN111 yebhetri ye-electrolyte additives ukongeza izongezo, ifumanise ukuba ukusebenza komjikelo wobushushu obuphezulu bebhetri kuyaphuculwa, kwaye izinga lokuzikhupha liyehliswa ngokubanzi.

Isizathu kukuba ezi zongezo zinokuphucula i-membrane ye-SEI ukukhusela i-electrode engalunganga yebhetri. 4 Imo yogcino Imo yogcino Imiba ephembelela ngokubanzi bubushushu bogcino kunye ne-SOC yebhetri. Ngokubanzi, okukhona iqondo lobushushu liphezulu, kokukhona iphezulu i-SOC, kokukhona inkulu ukuzikhupha kwebhetri.

UTAKASHI et al. Imifuniselo ekwaziyo kwiibhetri ze-ion phosphate phantsi kweemeko zokusetha kwakhona. Iziphumo zibonisa ukuba ubungakanani bokugcinwa kwamandla buyancipha ngokuthe ngcembe ngexesha leshelufu, kwaye ibhetri iyaphakanyiswa.

U-Liu Yunjian kunye nabanye basebenzisa ibhetri ye-lithium manganeti yorhwebo. Ifumanise ukuba amandla anxulumeneyo e-electrode echanekileyo aya phezulu nangaphezulu. Ubunakho obunxulumene ne-electrode engalunganga iyanda iPhantsi, ipropathi yayo yokunciphisa nayo iya iba namandla, zombini inokukhawulezisa imvula ye-MN, okukhokelela ekunyukeni kwezinga lokuzikhupha.

I-5 Ezinye izinto ezichaphazela iimeko zezinga lokuzikhupha kwebhetri, ngaphandle kweeninzi ezichazwe ngasentla, kukho kwakhona le miba ilandelayo: Kwinkqubo yokuvelisa, i-burrs eyenzekayo xa i-pole inqunyulwa, kwaye indawo yokuvelisa ifakwe kwibhetri. Ukungcola, njengothuli, umgubo wesinyithi kwi-plate, njl., ezi zinokubangela i-micro-short circuit yangaphakathi yebhetri; kukho isiphaluka se-elektroniki sangaphandle xa indawo yangaphandle imanzi, i-insulation yomgca wangaphandle ayikho ngokupheleleyo, i-battery case ihlwempuzekile, ibangele i-circuit ye-elektroniki yangaphandle, okubangelwa ukukhutshwa kwe-Self-discharge; ngexesha lokugcinwa kwexesha elide, izinto ezisebenzayo zezinto ze-electrode kunye nokudibanisa komqokeleli wangoku, okubangelwa ukuhla kwamandla, kunye nokunyuka kwe-self-discharge.

Nganye kwezi zinto zingasentla okanye udibaniso lwezinto ezininzi zingabangela ukuziphatha okuzikhuphayo kwebhetri ye-lithium-ion, okunzima ukuyifumana nokuqikelela ukusebenza kokugcinwa kwebhetri. Okwesibini, indlela yokulinganisa i-self-discharge ratio ingabonwa ngolu hlalutyo lungentla, ekubeni i-lithium ion ibhetri yokuzikhupha isantya ngokubanzi iphantsi. Izinga lokuzikhupha ngokwalo lichaphazelekayo ngubushushu, ukusetyenziswa kwemijikelezo kunye ne-SOC, ngoko ke ukulinganisa ngokuchanekileyo kokuzikhupha kwebhetri kunzima kakhulu kwaye kuchitha ixesha.

1 Umlinganiselo wokuzikhupha ngokwawo Indlela yokulinganisa yesiNtu Okwangoku, indlela yesintu yokufumanisa ukuzikhupha inezi ntlobo zintathu zilandelayo: Ukukhupha ukumisela ukulahleka kwamandla ebhetri. Izinga lokuzikhupha ngokwalo: ngohlobo lwe: c ngumthamo olinganisiweyo webhetri; I-C1 ngumthamo wokukhupha. Emva kokuba ukuvulwa kubekwe, umthamo oshiyekileyo webhetri unokufumaneka kwibhetri.

Ngeli xesha, iseli yebhetri iphinda ihlawuliswe kwaye ikhuphe ukusebenza komjikelo kwakhona, inqume umthamo opheleleyo wegalikhi yombane ngeli xesha. Le ndlela inokumisela ukuba ibhetri ayibuyiseki kwilahleko yesakhono kunye nelahleko yesakhono ebuyiselwa umva. ● Isantya sokunciphisa amandla ombane ovulekileyo Indlela yokulinganisa I-voltage yesiphaluka evulekileyo kunye ne-battery charge state SOC inobudlelwane obuthe ngqo, okoko nje ilinganisa izinga lokutshintsha kwe-OCV yebhetri ngexesha lexesha, oko kukuthi, indlela ilula, irekhoda ngokulula umbane webhetri nangaliphi na ixesha.

Ukuqhubela phambili, ngokwembalelwano phakathi kwe-voltage kunye ne-SOC yebhetri, imeko yokuhlawula ibhetri inokufumaneka. Umlinganiselo wokuzikhupha webhetri unokufumaneka ngokubala kokunciphisa i-voltage attenuation kunye nokubalwa kwamandla okunciphisa ahambelana nexesha leyunithi. ● Indlela yokubamba umthamo Ilinganisa amandla ombane okuvula afunwayo yibhetri okanye amandla afunekayo ukuwonga, okuphuma kumlinganiselo wokuzikhupha ngokwawo ebhetrini.

Oko kukuthi, umbane wokutshaja xa ibhetri evulekileyo yesiphaluka ilinganiswa, kwaye izinga lokuzikhupha ibhetri lingathathwa njengomlinganiselo wokutshaja olinganisiweyo. I-2 i-self-discharge ye-self-discharge Indlela yokulinganisa ngokukhawuleza Ngenxa yexesha elide elifunekayo kwindlela yokulinganisa eqhelekileyo, izinga lokuzikhupha liyindlela kuphela yokucoca ibhetri kwinkqubo yokufumanisa ibhetri ngenxa yexesha elide elifunekayo kwindlela yokulinganisa eqhelekileyo. Ukuvela kwenani elikhulu leendlela zokulinganisa ezintsha kunye nezilungeleyo, ukonga ixesha elininzi kunye namandla kwimilinganiselo yokukhupha ibhetri.

● Itekhnoloji yolawulo lwedijithali iteknoloji yolawulo lwedijithali yindlela entsha yokulinganisa ukukhutshwa kwe-self-discharge yokulinganisa ukukhutshwa kwe-self-discharge esekelwe kwiindlela eziqhelekileyo zokulinganisa ukuzikhupha. Le ndlela ineenzuzo zokufutshane, ukuchaneka okuphezulu, ukuchaneka okuphezulu, izixhobo ezilula. ● Indlela yesekethe elinganayo yesekethe yindlela entsha yokulinganisa i-self-discharge, eyenza ibhetri ibe yisekethe elinganayo, enokulinganisa ngokukhawuleza nangokufanelekileyo izinga lokuzikhupha kweebhetri ze-lithium-ion.

Okwesithathu, ukulinganisa intsingiselo ye-self-discharge ratio Njengesalathiso esibalulekileyo sokusebenza kwebhetri ye-lithium ion, inefuthe elibalulekileyo ekuhlolweni nasekuhlawuleni ibhetri, ngoko ke izinga lokuzilahla kweebhetri ze-lithium-ion linokubaluleka okude. I-1 Qikelela ingxaki yebhobhi efanayo kwi-bob efanayo, izinto ezisetyenzisiweyo, izinto ezisetyenzisiweyo kunye nolawulo lwemveliso ziyafana. Xa ibhetri nganye ngokucacileyo inkulu, isizathu mhlawumbi kungenxa yokungcola kunye nokugqobhoza idiaphragm.

Micro short circuit. Ngenxa yokuba impembelelo ye-micro-short kwibhetri iyacotha kwaye ayinakuguqulwa. Ngoko ke, ukusebenza kweebhetri ezinjalo akwahlukanga kakhulu kwiibhetri eziqhelekileyo ngexesha elifutshane, kodwa ngokunyuka ngokuthe ngcembe kweempendulo ezingenakuguqulwa zangaphakathi, ukusebenza kwebhetri kuya kuba ngaphantsi kakhulu kunokusebenza kwefektri kunye nokunye ukusebenza kwebhetri eqhelekileyo.

Ngoko ke, ukuze kuqinisekiswe umgangatho webhetri yefektri, ibhetri elizikhuphayo kufuneka lisuswe. I-2 Ukucwangcisa ibhetri kwiqela leebhetri ze-lithium ion ukuba zibe ngcono, kubandakanywa umthamo, i-voltage, ukuchasana kwangaphakathi, kunye nesantya sokukhutshwa okumhlophe, njl. Impembelelo yezinga lokuzikhupha kwebhetri kwipakethi yebhetri yimbonakaliso ebalulekileyo.

Emva kokuba idityaniswe kwimodyuli, ngenxa yokuziqeqesha kwebhetri ye-lithium ion nganye, i-voltage iya kuncipha kwiidigri ezahlukeneyo, kuthotho ngexesha leshelufa okanye umjikelo Ngaphantsi kokutshaja, okwangoku ilingana, ngoko inokuhlawulwa ngaphezulu okanye ingagcwaliswa kwimodyuli yebhetri ye-lithium-ion emva kokutshaja, kwaye ukusebenza kuya kuhla kancinci kunye nenani lentlawulo kunye nokukhupha. Ubomi obujikelezayo xa kuthelekiswa neebhetri zemonoma ezingadityaniswanga. Ke ngoko, ipakethe yebhetri idinga umlinganiso ochanekileyo kunye nokuhlolwa kokuziqeqesha kweebhetri ze-lithium ion.

3 Ibhetri yeSOC uqikelelo Ukulungisa umthwalo ukwabizwa ngokuba ngamandla aseleyo, nto leyo emele umlinganiselo webhetri esetyenziswa ixesha elithile okanye ixesha elide ubambe umthamo oseleyo kunye nemeko yawo egcwaliswe ngokupheleleyo, esetyenziswa ngokuqhelekileyo. Izinga lokuzikhupha malunga nokuqikelelwa kwe-SOC yeebhetri ze-lithium ion kunexabiso elibalulekileyo lokubhekisela. Emva kokuzikhupha ngoku, ukulungiswa kwexabiso lokuqala le-SOC kunokuphucula ukuchaneka koqikelelo lwe-SOC.

Kwelinye icala, umthengi unokuqikelela ixesha okanye umgama wokuhamba wemveliso ngokwamandla aseleyo; kwelinye icala, ukuchaneka koqikelelo lwe-SOC lwe-BMS kunokuthintela ngokufanelekileyo ukutshajiswa kwebhetri i-Overlant, yandise ubomi bebhetri. .