Cov kauj ruam kawg hauv kev tsim cov roj teeb lithium yog qib thiab tshuaj xyuas cov roj teeb lithium kom ntseeg tau qhov sib xws ntawm cov roj teeb module thiab kev ua haujlwm zoo ntawm lub roj teeb module. Raws li paub rau txhua tus, cov qauv tsim los ntawm cov roj teeb uas muaj qhov sib xws muaj lub neej ua haujlwm ntev dua, thaum cov modules tsis zoo sib xws yog feem ntau ua rau overcharge thiab over-discharge vim lub thoob cov nyhuv, thiab lawv cov roj teeb lub neej attenuation yog nrawm. Piv txwv li, cov roj teeb sib txawv yuav ua rau muaj qhov sib txawv ntawm qhov sib txawv ntawm txhua txoj hlua roj teeb. Cov roj teeb uas muaj peev xwm me me thiab kev ua haujlwm tsis zoo yuav ncav cuag lub xeev them nqi ua ntej. Yog li ntawd, cov roj teeb uas muaj peev xwm loj thiab kev ua haujlwm zoo tsis tuaj yeem ncav cuag lub xeev them tag nrho. Cov roj teeb tsis sib xws ua rau txhua lub roj teeb hauv ib txoj hlua sib txuas kom them ib leeg. Lub roj teeb uas muaj qhov hluav taws xob ntau dua tsub lub roj teeb nrog lub zog qis, uas ua rau lub roj teeb ua haujlwm tsis zoo thiab siv lub zog ntawm tag nrho cov hlua roj teeb. Lub roj teeb uas muaj tus kheej tso tawm siab muaj peev xwm poob ntau. Kev tsis sib haum ntawm tus kheej tawm tus nqi ua rau qhov sib txawv ntawm cov nqi them thiab qhov hluav taws xob ntawm cov roj teeb, cuam tshuam rau kev ua haujlwm ntawm cov hlua roj teeb. Thiab yog li cov roj teeb sib txawv no, kev siv mus sij hawm ntev yuav cuam tshuam rau lub neej ntawm tag nrho cov module.

Daim duab

FIG. 1.OCV- kev khiav hauj lwm voltage – polarization voltage daim duab

Kev faib cov roj teeb thiab kev tshuaj ntsuam xyuas yog kom tsis txhob tso cov roj teeb tsis sib xws tib lub sijhawm. Lub roj teeb sab hauv tsis kam thiab kev ntsuas tus kheej yog qhov yuav tsum tau ua. Feem ntau hais lus, roj teeb sab hauv tsis kam muab faib ua ohm sab hauv tsis kam thiab polarization sab hauv tsis kam. Ohm sab hauv kuj muaj cov khoom siv hluav taws xob, electrolyte, diaphragm tsis kam thiab kev sib cuag ntawm txhua qhov, suav nrog hluav taws xob impedance, ionic impedance thiab tiv tauj impedance. Polarization internal kuj yog hais txog kev tiv thaiv los ntawm polarization thaum lub sij hawm electrochemical cov tshuaj tiv thaiv, nrog rau electrochemical polarization sab hauv kuj thiab concentration polarization internal kuj. Lub ohmic tsis kam ntawm lub roj teeb yog txiav txim los ntawm tag nrho cov conductivity ntawm lub roj teeb, thiab polarization tsis kam ntawm lub roj teeb yog txiav txim los ntawm cov khoom theem diffusion coefficient ntawm lithium ion nyob rau hauv lub electrode active khoom. Feem ntau, kev tiv thaiv sab hauv ntawm lithium roj teeb yog sib cais los ntawm cov txheej txheem tsim, cov khoom siv nws tus kheej, ib puag ncig thiab lwm yam, uas yuav raug tshuaj xyuas thiab txhais hauv qab no.

Ua ntej, txheej txheem tsim

(1) Cov qauv electrode zoo thiab tsis zoo muaj cov ntsiab lus ntawm cov khoom siv hluav taws xob tsawg, uas ua rau muaj hluav taws xob loj loj impedance ntawm cov khoom thiab cov khoom siv, uas yog, hluav taws xob impedance siab. Lithium roj teeb ua kom sov sai dua. Txawm li cas los xij, qhov no yog txiav txim siab los ntawm tus tsim ntawm lub roj teeb, piv txwv li, lub hwj chim roj teeb yuav tsum coj mus rau hauv tus account tus nqi kev ua tau zoo, nws yuav tsum tau ib tug ntau dua piv ntawm conductive tus neeg saib xyuas, haum rau loj tus nqi thiab paug. Lub peev xwm roj teeb muaj peev xwm me ntsis ntxiv, qhov zoo thiab qhov tsis zoo ntawm cov khoom siv feem ntau yuav siab dua me ntsis. Cov kev txiav txim siab no yog ua thaum pib ntawm lub roj teeb tsim thiab tsis tuaj yeem hloov tau yooj yim.

(2) muaj ntau dhau lawm binder nyob rau hauv qhov zoo thiab tsis zoo electrode formula. Lub binder feem ntau yog cov khoom siv polymer (PVDF, SBR, CMC, thiab lwm yam) nrog kev ua haujlwm zoo rwb thaiv tsev. Txawm hais tias qhov kev faib ua feem ntau dua ntawm cov binder nyob rau hauv thawj qhov sib piv yog qhov zoo los txhim kho lub zog ntawm cov ncej, nws yog qhov tsis zoo rau kev ua haujlwm sab hauv. Nyob rau hauv lub roj teeb tsim los tswj kev sib raug zoo ntawm binder thiab binder ntau npaum li cas, uas yuav tsom rau lub dispersion ntawm binder, uas yog, slurry npaj txheej txheem, kom deb li deb raws li ua tau kom lub dispersion ntawm binder.

(3) Cov khoom xyaw tsis sib npaug sib npaug, tus neeg sawv cev conductive tsis tawg tag nrho, thiab cov qauv siv hluav taws xob zoo tsis tsim. Raws li pom nyob rau hauv daim duab 2, A yog cov ntaub ntawv ntawm tsis zoo dispersion ntawm conductive tus neeg saib xyuas, thiab B yog cov ntaub ntawv ntawm zoo dispersion. Thaum tus nqi ntawm cov khoom siv hluav taws xob zoo ib yam, qhov kev hloov pauv ntawm cov txheej txheem nplawm yuav cuam tshuam rau cov dispersion ntawm tus neeg sawv cev conductive thiab lub zog sab hauv ntawm lub roj teeb.

Daim duab 2. Tsis zoo dispersion ntawm conductive agent (A) Uniform dispersion of conductive agent (B)

(4) Lub binder tsis yaj tag, thiab qee qhov micelle hais muaj nyob, ua rau muaj kev tiv thaiv sab hauv ntawm lub roj teeb. Tsis muaj teeb meem kev sib xyaw qhuav, kev sib xyaw ib nrab qhuav lossis ntub cov txheej txheem sib xyaw, nws yuav tsum tau ua kom cov hmoov sib tov sib xyaw kom tiav. Peb tsis tuaj yeem ua raws li kev ua haujlwm ntau dhau thiab tsis quav ntsej txog lub hom phiaj xav tau tias tus binder xav tau ib lub sijhawm los ua kom tiav tag nrho.

(5) Lub electrode compaction ceev yuav cuam tshuam rau sab hauv ntawm lub roj teeb. Lub compact ceev ntawm lub electrode phaj yog me me, thiab lub porosity ntawm cov hais nyob rau hauv lub electrode phaj yog siab, uas yog tsis conducive rau kis tau tus mob ntawm electrons, thiab lub internal kuj ntawm lub roj teeb yog siab. Thaum daim ntawv electrode yog compacted ntau dhau lawm, cov electrode hmoov tej zaum yuav overcrushed, thiab electrode kis tau tus mob txoj kev yuav ntev tom qab crushing, uas yog tsis conducive rau tus nqi thiab tso tawm kev ua tau zoo ntawm lub roj teeb. Nws yog ib qho tseem ceeb uas yuav tau xaiv txoj cai compaction ceev.

(6) Kev vuam tsis zoo ntawm qhov zoo thiab qhov tsis zoo electrode lug thiab cov kua dej sau, vuam virtual, roj teeb ua haujlwm siab. Kev tsim cov vuam tsis zoo yuav tsum raug xaiv thaum vuam, thiab vuam tsis xws li vuam fais fab, amplitude thiab lub sij hawm yuav tsum tau optimized los ntawm DOE, thiab qhov zoo ntawm vuam yuav tsum raug txiav txim los ntawm vuam lub zog thiab zoo li.

(7) tsis zoo winding los yog lamination tsis zoo, qhov sib txawv ntawm lub diaphragm, zoo phaj thiab tsis zoo phaj yog loj, thiab ion impedance loj.

(8) Lub roj teeb electrolyte tsis tau nkag mus rau hauv qhov zoo thiab qhov tsis zoo electrodes thiab diaphragm, thiab cov qauv tsim electrolyte tsis txaus, uas tseem yuav ua rau lub roj teeb loj ionic impedance.

(9) Cov txheej txheem tsim tsis zoo, graphite anode nto SEI tsis ruaj khov, cuam tshuam rau sab hauv ntawm lub roj teeb.

(10) Lwm yam, xws li kev ntim khoom tsis zoo, vuam tsis zoo ntawm cov pob ntseg pob ntseg, roj teeb to thiab cov dej noo siab, muaj kev cuam tshuam zoo rau cov roj teeb lithium sab hauv.

Thib ob, cov ntaub ntawv

(1) Kev tiv thaiv ntawm anode thiab anode cov ntaub ntawv yog loj.

(2) Kev cuam tshuam ntawm cov khoom siv diaphragm. Xws li diaphragm thickness, porosity loj, pore loj thiab lwm yam. Thickness yog cuam tshuam nrog kev ua haujlwm sab hauv, lub thinner lub sab hauv kuj yog me dua, thiaj li ua kom tau lub zog siab thiab tso tawm. Raws li me me raws li qhov ua tau nyob rau hauv ib qho kev siv lub zog, lub thicker lub zog puncture yog qhov zoo dua. Qhov pore loj thiab pore loj ntawm diaphragm muaj feem xyuam rau impedance ntawm ion thauj. Yog tias qhov pore loj me dhau, nws yuav ua rau kom cov ion impedance. Yog tias qhov pore loj dhau lawm, nws yuav tsis tuaj yeem cais tag nrho cov hmoov zoo thiab tsis zoo, uas yuav yooj yim ua rau luv luv lossis raug tho los ntawm lithium dendrite.

(3) Kev cuam tshuam ntawm cov khoom siv electrolyte. Lub ionic conductivity thiab viscosity ntawm cov electrolyte yog txuam nrog ionic impedance. Qhov ntau dua qhov hloov pauv ionic impedance, ntau dua qhov kev tiv thaiv sab hauv ntawm lub roj teeb, thiab qhov loj dua qhov polarization hauv cov txheej txheem them thiab tawm.

(4) Kev cuam tshuam ntawm cov khoom zoo PVDF. Qhov feem ntau ntawm PVDF lossis siab molecular hnyav kuj yuav ua rau muaj kev tiv thaiv sab hauv ntawm lithium roj teeb.

(5) Kev cuam tshuam ntawm cov khoom siv hluav taws xob zoo. Kev xaiv ntawm hom conductive tus neeg saib xyuas kuj tseem ceeb, xws li SP, KS, conductive graphite, CNT, graphene, thiab lwm yam, vim muaj qhov sib txawv morphology, kev ua tau zoo ntawm lithium roj teeb yog qhov sib txawv, nws tseem ceeb heev rau xaiv. tus neeg sawv cev conductive nrog siab conductivity thiab haum rau siv.

(6) cuam tshuam ntawm cov khoom zoo thiab tsis zoo ntawm pob ntseg pob ntseg. Lub thickness ntawm tus ncej pob ntseg yog nyias, lub conductivity tsis zoo, lub purity ntawm cov khoom siv yog tsis siab, lub conductivity yog tsis zoo, thiab lub internal kuj ntawm lub roj teeb yog siab.

(7) cov ntawv ci tooj liab yog oxidized thiab welded tsis zoo, thiab cov khoom siv aluminium ntawv muaj cov conductivity tsis zoo los yog oxide rau ntawm qhov chaw, uas yuav ua rau muaj kev tiv thaiv sab hauv ntawm lub roj teeb.

Daim duab

Lwm yam

(1) Internal resistance test instrument deviation. Cov cuab yeej yuav tsum tau kuaj xyuas tsis tu ncua txhawm rau tiv thaiv qhov ntsuas tsis raug tshwm sim los ntawm qhov ntsuas tsis raug.

(2) Cov roj teeb hauv lub cev tsis zoo tshwm sim los ntawm kev ua haujlwm tsis raug.

(3) Ib puag ncig tsim khoom tsis zoo, xws li xoob tswj cov plua plav thiab ya raws. Rhiav plua plav tshaj tus qauv, yuav ua rau kom muaj kev tiv thaiv sab hauv ntawm lub roj teeb, nws tus kheej tawm aggravated. Rhiav dej noo yog siab, tseem yuav cuam tshuam rau lithium roj teeb kev ua haujlwm.