Keeb kwm

Thermal propagation ntawm ib tug module muaj raws li nram no theem: Thaum tshav kub kub tsub kom tom qab cell thermal tsim txom, cell thermal runaway thiab ces module thermal runaway. Thermal runaway los ntawm ib lub cell tsis muaj kev cuam tshuam; Txawm li cas los xij, thaum tshav kub kis mus rau lwm lub hlwb, kev nthuav tawm yuav ua rau muaj kev cuam tshuam domino, ua rau lub thermal runaway ntawm tag nrho cov module, tso lub zog loj. Daim duab 1ua yeeb yams qhov tshwm sim ntawm thermal runaway test. Lub module yog hluav taws kub vim irresistible propagation.

Lub tshav kub conductivity nyob rau hauv ib lub cell yuav txawv raws li cov lus qhia sib txawv. Lub coefficient ntawm tshav kub conductivity yuav siab dua nyob rau hauv cov kev taw qhiathaum uas tig musnrog ib tug yob ntawm ib tug cell; thaum cov kev taw qhia uas yog ntsug rau lub yob core muaj qis conductivity. Yog li thermal kis ntawm sab mus rau sab ntawm cov hlwb sai dua li nws ua los ntawm tabs mus rau cov hlwb. Yog li ntawd, propagation yuav pom raws li ib tug-dimension propagation. Raws li cov roj teeb modules tau tsim los rau lub zog ntau dua, qhov chaw nruab nrab ntawm cov hlwb tau me dua, uas yuav ua rau cov thermal nthuav tawm. Yog li ntawd, suppressing los yog thaiv kev sib kis ntawm tshav kub nyob rau hauv lub module yuav suav hais tias yog ib qhonyhuvive txoj kev kom txo kev phom sij. 

Txoj hauv kev los suppress thermal runaway nyob rau hauv ib qho module

Peb tuaj yeem tswj cov thermal khiav tawm kom nquag plias lossis tsis ua haujlwm.

Active suppress

Kev ua haujlwm thermal nthuav tawm feem ntau yog raws li kev tswj hwm thermal, xws li:

1) Teem cov kav dej txias rau hauv qab lossis sab hauv ntawm lub module, thiab sau nrog cov kua txias. Cov dej txias txias tuaj yeem txo qhov kev nthuav tawm zoo.

2) Teeb cov kav hluav taws tua hluav taws rau saum lub module. Thaum muaj cov thermal khiav tawm, cov roj kub kub tso tawm los ntawm lub roj teeb yuav ua rau cov kav dej tua hluav taws tua kom tsis txhob muaj kev nthuav tawm.

Txawm li cas los xij, kev tswj xyuas thermal xav tau cov khoom siv ntxiv, ua rau tus nqi siab dua thiab qis zog ceev. Kuj tseem muaj peev xwm hais tias qhov kev tswj hwm yuav tsis siv.

Passive suppression

Passive suppression ua haujlwm los ntawm kev thaiv kev nthuav tawm los ntawm cov khoom adiabatic ntawm thermal runaway hlwb thiab cov hlwb ib txwm.

Feem ntau cov khoom yuav tsum muaj nyob rau hauv:

1. Tsawg thermal conductivity. Qhov no yog kom txo qhov ceev ntawm tshav kub kis.
2. Kub kub kuj. Cov khoom siv yuav tsum tsis txhob daws qhov kub thiab txias thiab poob lub peev xwm ntawm thermal kuj.
3. Tsawg ceev. Qhov no yog txhawm rau txo qis ntawm qhov ntim-zog tus nqi thiab huab hwm coj-zog tus nqi.

Cov khoom siv zoo tagnrho tuaj yeem thaiv cov cua kub sib kis nrog rau nqus cov cua sov.

Kev tsom xam ntawm cov khoom

• Airgel

Airgel yog lub npe hu ua "cov khoom siv hluav taws xob zoo tshaj plaws". Nws yog ua tau zoo nyob rau hauv rwb thaiv tsev kub thiab hnyav lub teeb. Nws yog dav siv hauv roj teeb module rau thermal propagation tiv thaiv. Muaj ntau hom aerogel, zoo li silicon dioxide aerogel, aerogel, iav fiber ntau airgel thiab pre-oxidized fiber ntau. Airgel tshav kub rwb thaiv tsev txheej ntawm cov ntaub ntawv sib txawv muaj ntau yam cuam tshuam rau thermal runaway. Qhov no yog vim muaj ntau yam thermal conductivity coefficient, uas muaj feem xyuam nrog nws cov qauv micro. Daim duab 2 qhia SEM zoo li cov khoom sib txawv ua ntej thiab tom qab hlawv.

Kev tshawb fawb qhia tau hais tias txawm tias fiber ntau rwb thaiv tsev kub yog qis dua tus nqi, qhov ua tau zoo ntawm kev thaiv cov cua sov propagation yog phem dua li cov khoom siv airgel. Ntawm ntau hom airgel cov ntaub ntawv, pre-oxidized fiber airgel ua tau zoo tshaj plaws, raws li nws tswj cov qauv tom qab hlawv. Ceramic fiber ntau airgel kuj ua tau zoo hauv kev rwb thaiv tsev kub.

• Theem hloov khoom siv

Phase hloov khoom siv kuj yog siv dav rau kev tiv thaiv thermal runaway propagation vim nws khaws cia cua sov. Wax yog ib hom PCM, nrog rau theem ruaj khov hloov kub. Thaum tshav kub kubkhiav tawm, cua sov yog loj heev tso tawm. Yog li PCM yuav tsum muaj siabkev ua tau zoontawm absorbing tshav kub. Txawm li cas los xij, wax muaj cov khoom siv hluav taws xob tsawg, uas yuav cuam tshuam rau cov cua sov. Txhawm rau txhawb nws cov kev ua tau zoo, cov kws tshawb fawb sim ua ke siv quav ciab nrog lwm cov ntaub ntawv, xws li ntxiv cov khoom siv hlau, siv hlau ua npuas ncauj los thauj PCM, ntxivgraphite, carbon nano tube lossis nthuav graphite, thiab lwm yam. Expanded graphite kuj tuaj yeem txwv cov nplaim taws los ntawm thermal runaway.

Hydrophilic polymer kuj yog ib yam ntawm PCM rau kev txwv thermal runway. Cov khoom siv hydrophilic polymer feem ntau yog: colloidal silicon dioxide, saturated calcium chloride tov,Tetraethyl phosphate,tetra uaphenyl hydrogen phosphate, sodium polyacrylate, lwm.

•  Hybrid khoom

Thermal runaway tsis tuaj yeem tswj tau yog tias peb tsuas yog tso siab rau aerogel. Ua tiavrwb thaiv tsevThaum tshav kub kub, peb yuav tsum muab cov airgel nrog PCM.

Dhau li ntawm cov khoom siv hybrid, peb tuaj yeem tsim cov khoom siv ntau txheej nrog ntau yam thermal conductivity coefficients nyob rau hauv ntau cov lus qhia. Peb tuaj yeem siv cov khoom siv thermal conductivity siab los ua kom cov cua sov tawm ntawm cov qauv, thiab muab cov khoom siv hluav taws xob rwb thaiv tsev ntawm cov hlwb kom txwv tsis pub thermal nthuav tawm.

Xaus

Txhawm rau tswj thermal runaway propagation yog ib qho kev kawm nyuaj. Qee cov tuam ntxhab tau ua qee qhov kev daws teeb meem los txo cov cua sov sib kis, tab sis lawv tseem tab tom nrhiav ib yam tshiab, txhawm rau txo tus nqi thiab kev cuam tshuam ntawm lub zog ceev. Peb tseem tab tom tsom mus rau qhov kev tshawb fawb tshiab. Tsis muaj“khoom siv super” uas tuaj yeem thaiv cov thermal khiav tawm tag nrho. Nws yuav tsum muaj ntau yam kev sim kom tau txais cov kev daws teeb meem zoo tshaj plaws.