Internal resistance ntawm lithium roj teeb yog dab tsi?
Thaum tam sim no ntws los ntawm sab hauv lub roj teeb, nws ntsib qhov tsis kam, ua rau txo qis hauv lub roj teeb lub zog ua haujlwm. Qhov kev tiv thaiv no yog hu ua lub roj teeb sab hauv. Vim lub roj teeb lub zog sab hauv, lub davhlau ya nyob twg voltage qis dua lub zog hluav taws xob thiab qhib - qhov hluav taws xob hluav taws xob thaum tawm. Thaum them nyiaj, qhov hluav taws xob davhlau ya nyob twg yog siab dua li lub zog hluav taws xob thiab qhib - qhov hluav taws xob hluav taws xob. Roj teeb sab hauv kuj yog ib qho tseem ceeb heev parameter ntawm ib tug tshuaj zog qhov chaw. Nws cuam tshuam ncaj qha rau lub roj teeb kev khiav hauj lwm voltage, kev khiav hauj lwm tam sim no, tso zis zog, thiab lub zog. Rau kev siv tshuaj siv hluav taws xob siv hluav taws xob, qhov qis dua qhov kev tiv thaiv sab hauv, qhov zoo dua.
Roj teeb sab hauv kuj tsis tas li; Nws txawv thaum lub sij hawm tso tawm nyob ntawm seb muaj pes tsawg leeg ntawm cov khoom siv, cov electrolyte concentration, roj teeb kub, thiab lub sij hawm tawm. Lub roj teeb sab hauv muaj xws li ohmic internal resistance (R₀) thiab polarization internal resistance (Rf) pom los ntawm electrodes thaum lub sij hawm electrochemical tshua. Qhov sib npaug ntawm ob yog hu ua lub roj teeb tag nrho sab hauv tsis kam (Rw).
Ohmic sab hauv tsis kam yog tsuas yog tsim los ntawm cov khoom siv hluav taws xob sab hauv, electrolyte, cais, thiab kev sib cuag ntawm ntau yam khoom. Nws muaj feem xyuam rau lub roj teeb qhov loj, qauv, electrode forming method (piv txwv li, muab tshuaj txhuam- hom thiab tubular electrodes nyob rau hauv lead-acid roj teeb, thiab lub thawv- hom thiab sintered electrodes hauv alkaline roj teeb), thiab sib dhos nruj. Ohmic sab hauv tsis kam ua raws li Ohm txoj cai.
Polarization Internal Resistance yog hais txog kev tiv thaiv sab hauv los ntawm polarization ntawm qhov zoo thiab qhov tsis zoo ntawm cov hluav taws xob hluav taws xob hauv hluav taws xob thaum lub sij hawm cov tshuaj tiv thaiv electrochemical. Nws yog cov sum ntawm cov resistances tshwm sim los ntawm electrochemical polarization thiab concentration
polarization.
Polarization sab hauv kuj muaj feem xyuam rau qhov xwm ntawm cov khoom siv, cov qauv electrode, thiab cov txheej txheem tsim roj teeb, tshwj xeeb tshaj yog muaj feem xyuam nrog cov roj teeb kev ua haujlwm; tso tawm tam sim no thiab qhov kub thiab txias muaj qhov cuam tshuam loj heev. Thaum lub sij hawm siab ceev tam sim no tawm, ob qho tib si electrochemical polarization thiab concentration polarization nce, muaj peev xwm txawm ua rau passivation ntawm qhov tsis zoo electrode, yog li nce polarization sab hauv kuj. Qhov kub thiab txias tsis zoo cuam tshuam rau electrochemical polarization thiab ion diffusion; yog li ntawd, lub roj teeb lub polarization sab hauv kuj nce nyob rau hauv qis -kub tej yam kev mob. Yog li ntawd, polarization kuj tsis yog tas li, tab sis hloov nrog tus nqi tawm, qhov kub thiab lwm yam kev mob.
Cov lus piav qhia rau kev tiv thaiv sab hauv ntawm lub roj teeb yog raws li hauv qab no:
Hauv cov qauv, bE (iₐ,τ,C) Iₐ⁻¹- Roj teeb polarization sab hauv tsis kam;
b-Cov coefficient ntawm kev sib txawv ntawm lub roj teeb lub davhlau ya nyob twg voltage txheeb ze rau lub roj teeb davhlau ya nyob twg voltage E nyob rau hauv rated peev xwm thaum lub roj teeb them thiab tawm nrog tam sim no Iₐ;
Rₑₗ(τ,C)-Resistance ntawm cov electrolyte;
Rₑ(C)-Electrode kuj. Cov electrolyte kuj Rₑₗ thiab electrode kuj Rₑ yog inversely proportional rau lub instantaneous muaj peev xwm ntawm lub roj teeb;
iₐ, τ, C- Lub roj teeb them thiab tso tawm tam sim no, qhov kub thiab txias, thiab lub peev xwm ntawm lub sijhawm ntawd.
Lub roj teeb sab hauv kuj tseem me me thiab feem ntau tsis pom zoo nyob rau hauv ntau yam kev ua haujlwm. Txawm li cas los xij, cov roj teeb hluav taws xob rau cov tsheb hluav taws xob feem ntau ua haujlwm nyob rau hauv cov xwm txheej tam sim no thiab qhov tob tob, uas ua rau muaj qhov cuam tshuam loj heev los ntawm kev ua haujlwm sab hauv. Hauv qhov no, qhov cuam tshuam ntawm kev tiv thaiv sab hauv ntawm tag nrho cov Circuit Court tsis tuaj yeem tsis quav ntsej.
