About battery internal resistance and measurement method

Umbhali :Iflowpower-UMboneleli weSikhululo saMandla esiphathwayo

Iindidi ezahlukeneyo zokumelana nebhetri yangaphakathi. Uhlobo olufanayo lwebhetri, ngenxa yokungahambelani kweempawu zeekhemikhali zangaphakathi, ukuchasana kwangaphakathi kuyahluka. Ukuchasana kwangaphakathi kwebhetri kuncinci, ngokuqhelekileyo sisebenzisa iiyunithi ze-millis ukuyichaza.

Ukuchasana kwangaphakathi sisalathisi esibalulekileyo sobugcisa bokulinganisa ukusebenza kwebhetri. Ngaphantsi kweemeko eziqhelekileyo, umthamo omkhulu wokukhutshwa kwangoku wokuchasana kwangaphakathi unamandla, kwaye umthamo wangaphakathi wokukhupha ibhetri ubuthathaka. Kwi-schemetic yesekethe yokukhupha, sinokuqwalasela ibhetri kunye nokuthintela kwangaphakathi, ukwahlulwe kumtya wamandla ongekho ngokupheleleyo ukuchasana kwangaphakathi ukudibanisa ukuchasana okuncinci kakhulu.

Ngeli xesha, ukuba umthwalo wangaphandle ulula, i-voltage eyabelwe kwesi sixhasi sincinci sincinci, kwaye ngokuphambeneyo ukuba umthwalo wangaphandle ulayishiwe, ngoko i-voltage eyabiwe kwesi sixhasi sincinci sisikhulu kakhulu, kuya kubakho inxalenye yamandla. idliwe kule Introelectric (enokuthi iguqulwe ibe yifiva, okanye ezinye iireverse electrochemical reactions). Ukuchasana kwangaphakathi kwebhetri ehlaziywayo kuncinci, kodwa emva kokusetyenziswa kwexesha elide, ngenxa yokunciphisa i-electrolyte yangaphakathi yebhetri, ibhloko yangaphakathi yanda ngokuthe ngcembe, de kube ukuchasana kwangaphakathi kukhulu kwibhetri. Amandla angaphakathi akanakukhululwa ngokuqhelekileyo.

Ngeli xesha, ibhetri "ubomi bufile". Uninzi lweebhetri eziguga ngenxa yezizathu ezigqithisileyo zokuchasana kwangaphakathi, akukho xabiso lokusetyenziswa. Ngoko ke, kufuneka sinikele ingqalelo ngakumbi umthamo ibhetri ayikho inheoned.

Okokuqala, ukuchasana kwangaphakathi akulona ixabiso elimiselweyo, xa ibhetri ikwimimandla yamandla ahlukeneyo, ixabiso layo langaphakathi lokuchasana lihlukile; ibhetri ikubomi benkonzo eyahlukeneyo, ixabiso layo langaphakathi lokumelana nalo lihlukile. Ngokwembono yetekhnoloji, ngokuqhelekileyo siphawula ukuxhathisa kombane kwibhetri ukuya kumazwe amabini: ukutshaja ukuchasana kwangaphakathi kwelizwe kunye nokukhupha ukuxhathisa kwangaphakathi. 1.

Ngaphakathi kwimeko yokutshaja kuthetha ukuba ibhetri elinganisiweyo kwibhetri igcwaliswe ngokupheleleyo. 2. Beka ukuchasana kwangaphakathi kwebhetri ukubhekisela kwibhetri yangaphakathi yokumelana nomlinganiselo emva kokuba ibhetri ikhutshwe ngokupheleleyo (ukukhupha kwi-standard cutoff voltage).

Ngokuqhelekileyo, ukuchasana kwangaphakathi kokukhutshwa akuzinzile. Iziphumo zokulinganisa ziphezulu kakhulu kunexabiso eliqhelekileyo, kwaye i-recharge state izinzile, kwaye umlinganiselo ubaluleke kakhulu. Ngoko ke, kumlinganiselo webhetri, sonke senze umlinganiselo womlinganiselo kwisimo sokutshaja.

Okwesibini, ukuchasana kwangaphakathi akunakusetyenziselwa ukulinganisa ngokuchanekileyo indlela eqhelekileyo kunokuthi iklasi ye-physics yesikolo esiphakamileyo inefomula elula + ibhokisi yokumelana nokubala ukuchasana kwangaphakathi kokuchasana kwangaphakathi. kodwa iklasi yomzimba isekelwe ekuchaseni ibhokisi yokuchasa ukubala ukuchaneka kwe-algorithm yebhokisi yokuchasana Iphantsi kakhulu, imfundiso yokufundisa kuphela inokusetyenziswa kuphela kwizicelo eziphathekayo. Ukuchasana kwangaphakathi kwebhetri kuncinci, ngokuqhelekileyo siyichaza nge-micro Europe okanye iiyunithi ze-milliocanel.

Kumlinganiselo jikelele, sifuna impazamo yokulinganisa ukuchaneka kwangaphakathi kwebhetri ukuba ilawulwe ngaphakathi kwe-5%. Ukuchasana okuncinci okunjalo kunye neemfuno ezichanekileyo kufuneka zilinganiswe ngesixhobo esizinikeleyo. III.

Kwishishini langoku, ibhetri yendlela yokulinganisa ukuxhatshazwa kwangaphakathi isetyenziswa, umlinganiselo ochanekileyo wokuchasana kwangaphakathi uqhutywa zizixhobo ezikhethekileyo. Makhe ndithethe ngendlela yokulinganisa ibhetri yangaphakathi esetyenziswa kushishino. Indlela yokulinganisa ibhetri yangaphakathi esetyenziswa kushishino lwangoku inezi ntlobo zimbini zilandelayo: 1.

I-DC yokukhupha umlinganiselo wangaphakathi wokuchasana. Ngokutsho kwefomula yomzimba R = U / I, isixhobo sokuvavanya sivumela ibhetri ukuba inyanzelise ibhetri ngokusebenzisa i-DC yangoku enkulu (okwangoku isebenzisa i-current enkulu ye-40A ukuya kwi-80A) ngexesha elifutshane (okwangoku lisebenzisa i-40A ukuya kwi-80A. ), ukulinganisa ibhetri I-voltage kwiziphelo zombini kwaye ibala ibhetri yangoku ukumelana kwangaphakathi ngokwefomula. Ukuchaneka kwale ndlela yokulinganisa iphezulu kwaye ilawulwa.

Impazamo yokuchaneka komlinganiselo inokulawulwa ngaphakathi kwe-0.1%. Nangona kunjalo, le ndlela ineziphene ezibalulekileyo: (1) inokulinganisa kuphela ibhetri enkulu okanye ibhetri, ibhetri encinci engalayishi i-40A kwi-80A kwi-2 ukuya kwi-3 imizuzwana; (2) Xa ibhetri igqithiswa kumbane omkhulu I-electrode ngaphakathi kwebhetri iya kubangela i-polarization, ivelise ukuchasana kwe-polarized ngaphakathi.

Ngoko ke, ixesha lokulinganisa kufuneka libe lifutshane, ngaphandle koko impazamo yokuchasana yangaphakathi elinganisiweyo inkulu; (3) umsinga omkhulu wonakaliswa yi-electrode ngaphakathi kwebhetri ngebhetri. 2. Uxinzelelo lwe-AC lwehla umlinganiselo wokuchasana wangaphakathi.

Ngenxa yokuba ibhetri eneneni ilingana nokumelana okusebenzayo, sisebenzisa i-frequency esisigxina kunye nesigxina sangoku kwibhetri (okwangoku sisebenzisa i-1 kHz frequency, i-50mA yangoku encinci), emva koko isampuli yombane, ukulungiswa, ukuhluzwa, njl. ibhetri ibalwa yi-op amp circuit. Ixesha lokulinganisa ibhetri loxinzelelo lwe-AC lwehle indlela yokuchasana yangaphakathi lifutshane kakhulu, ngokubanzi kwi-100 millisecond.

Le ndlela yokulinganisa ichanekile nayo ilungile, kwaye impazamo yokuchaneka komlinganiselo iphakathi kwe-1% ukuya kwi-2%. Iingenelo kunye nokungonakali kwale ndlela: (1) Phantse zonke iibhetri zinokulinganiswa ngokusebenzisa indlela yokulinganisa ukuchasana kwangaphakathi, kubandakanywa neebhetri ezincinci. Umlinganiselo wokuchasa wangaphakathi we-laptop yebhetri yeselula ngokubanzi ngale ndlela.

(2) Ukuchaneka komlinganiselo wendlela yokulinganisa i-AC yoxinzelelo lwe-drop kungenzeka ukuba ichatshazelwe yi-ripple current, kwaye kunokwenzeka ukuba uphazamise i-harmonic current. Olu luvavanyo lwesakhono sokuchasana nokuphazamiseka kwisekethe yesixhobo sokulinganisa. (3) Ukulinganisa ngale ndlela, akuyi kuba nomonakalo omkhulu kwibhetri ngokwayo.

(4) Ukuchaneka komlinganiselo wendlela yokulinganisa uxinzelelo lwe-AC ayilungile njengoko i-DC ikhupha umlinganiselo wangaphakathi wokuchasana. 3. Vavanya impazamo yecandelo lesixhobo kunye nengxaki yonxibelelwano lwebhetri kuvavanyo.

Kungakhathaliseki ukuba le ndlela ingasentla, kukho ezinye iingxaki ezingahoywayo ngokulula kuthi, oko kukuthi, impazamo yecandelo lesixhobo sokuvavanya kunye nengxaki yentambo yovavanyo yokudibanisa ibhetri. Ngenxa yokuba ukuchasana kwangaphakathi kwebhetri kuya kulinganiswa kuncinci, ukuchasana kombane komgca kuya kuqwalasela. Ikhoboka elifutshane ukusuka isixhobo ukuya ibhetri ngokwayo kwakhona resistor (malunga nebakala Micro-European), kwakunye nokumelana uqhagamshelwano ibhetri kunye nomgca uxhulumaniso, ezi zinto kufuneka ibe kwisixhobo uhlengahlengiso impazamo yangaphakathi kwangaphambili.

Ke ngoko, uvavanyo olusesikweni lwebhetri lwangaphakathi luxhotyiswe ngokubanzi ngentambo ezinikeleyo kunye neshelufu yokulungisa ibhetri. Okwesine, ukushwankathela iibhetri ezininzi zokuguga, amandla angaphakathi aseninzi, kodwa ukuchasana kwangaphakathi kukhulu kakhulu, ngelishwa. Nangona kunjalo, xa ukuchasana kwangaphakathi kwebhetri kwanda, kunzima ukunciphisa le xabiso lokumelana kwangaphakathi.

Ngoko ke, ibhetri egugayo, nokuba sifuna "ukuyivula", ezifana nezothuso ezinkulu zangoku, ezidadayo ezincinci zangoku, zibeke ifriji, kodwa ininzi yazo, ibuyele emazulwini. Emva kokuqonda olu lwazi lungentla, siyazi ukuba ukukhetha ibhetri ukukhetha ibhetri encinci enganyangekiyo kangangoko kunokwenzeka. Ukongezelela, kubalulekile, ibhetri ayisetyenziswanga, kwaye ukuchasana kwayo kwangaphakathi kuya kuqhubeka nokunyuka.

Kucetyiswa ukuba usadinga ukusebenzisa ibhetri ukugcina umsebenzi wemichiza yangaphakathi yebhetri.