Ekifo kya bbaatule kye ki?
"Ekitundu".kitegeeza ensengeka y’enzimba munda mu bbaatule ekwata n’okusengeka obutoffaali. Kiwulikika nga kyangu, naye ennyonyola entuufu ey’ekigambo kino ekyukakyuka nnyo okusinziira ku kkampuni. Bwe nnali ku Rivian, buli omu yakiyita "cell carrier." Oluvannyuma lw'okugenda ewa omukozi wa tier-1 mu Korea, ebiwandiiko byonna eby'omunda byabiyita "ennyumba ya module." Ekintu kye kimu, erinnya ery’enjawulo.
Mbadde mu mulimu guno okumala emyaka 11, era osanga mmaze ebiseera bingi ku dizayini y’ebisenge okusinga ku nkola endala yonna. Si lwakuba nti tekinologiya yennyini nzibu nnyo; Kiva ku kuba nti kumpi buli kimu kigatta nnyo. Kyusa ekitundu kimu eky’ekisenge, era olina okuddamu-okudduka okukoppa okw’ebbugumu, ensengekera, n’okukuŋŋaanya byonna biddamu.
Ka nsunge okussa essira ku maanyi g’okuzimba obutoffaali - Wano we nnnye nga nyingidde mu mitego egisinga obungi.
Buli muntu amanyi obutoffaali obusookerwako buzimba mu kiseera kya chajingi/okufuuwa, naye obungi bwe buzimba mu butuufu bwawukana nnyo okusinziira ku data y’omugabi. Nze ndabye ebiwandiiko bya CATL eby’amawulire nga bigamba nti 8% bizimba obulamu bwonna ku busobozi obuweereddwa, ate Samsung SDI ewandiika ebitundu 12% ku katoffaali akageraageranyizibwa. Bw'obuuza bayinginiya baabwe, bagamba nti "embeera y'okugezesa ey'enjawulo." Kiki ekituufu? Tewali amanyi ddala. Kale mu dizayini, bulijjo tutwala omuwendo ogusinga obubi-omuwendo (12%) n’oluvannyuma ne tussaako ensonga endala ey’obukuumi eya 1.2×.
Mu 2021, nakolera ku pulojekiti ya US OEM (can’t name them). Ebipande by’enkomerero y’ekisenge byali bya mm 2.5 nga biriko sitampu. Twadduka amakumi ga CAE iterations - stress ne deformation byonna byalabika bulungi. Awo, nga wayise emyezi nga 14 oluvannyuma lwa SOP, okulemererwa mu nnimiro kwatandika okuyiringisibwa. Ebituli byalabika wakati w’ekituli ekijjuza n’ekyuma ekikuba ennyogovu, okuziyiza okw’ebbugumu kwakuba waggulu, era obutoffaali obumu bwali bukola diguli 7–8 okusinga baliraanwa baabwe. BMS teyasudde nsobi kubanga yali tennaba kukuba threshold, naye okukaddiwa okw’amangu kwali tekwewalika. Twatuuka ekiseera ne tukyusa ne tudda ku mm 4 die-okusasulira aluminum end plates era ensonga n’ebula.(Sijja kwogera ku ngeri ssente ezo ez’okuddamu okukola gye zaali zirabika.)
Lwaki simulation teyagikwata?
Kubanga ekizimba-Force load case gye twaliisa mu CAE kyali kikyamu kyokka. Ebiwandiiko by'omukozi w'obutoffaali byapimibwa ku diguli 25 ezitakyukakyuka . Mu butuufu, mmotoka bw’eba evuga okwetoloola Phoenix mu biseera by’obutiti, ebbugumu lya pack bulijjo lisukka diguli 45 . Electrolyte thermal expansion + Okukula kwa SEI okwanguwa=empalirizo y’okuzimba entuufu waggulu nnyo okusinga omuwendo gw’olupapula lw’amawulire. Tewali amanyi mukubisa ddala. Oluvannyuma lw’akatyabaga ako, siddamu kwesiga simulation yokka - kati tulagirira ebbugumu -ekisenge ekinene-okukakasa okuvuga kw’obugaali okw’ebbugumu ku buli dizayini empya.
Obutoffaali obulimu ssiringi emboozi ya njawulo ddala.
Okumala emyaka gya 21700 oba 4680, obugumu bwazo obusinga buva mu kibbo kyennyini; Okugaziwa kwa axial kutono. Ekisinga okweraliikiriza ye nkola y’okuteeka ebanga n’okunyweza.
Tesla’s 4680 structural pack nkola esikiriza: obutoffaali bukwatagana butereevu n’okwesiiga ku bipande ebya waggulu n’ebya wansi, mu ngeri entuufu okufuula obutoffaali omugugu-abalina ebitundu.
Enkizo ennene:Okumalawo obuzito bw’ekisenge eky’ennono.
Ekibi ekinene ennyo:Zero serviceability - cell emu embi ate pack yonna eba scrap.
Personally, I think this trade-off ekola amakulu gonna ku nkola ya bizinensi ya Tesla (vertical integration + gigacasting mindset), naye tekwatagana na buli OEM akulembeza serviceability. Bayinginiya ba Ford ne GM be njogeddeko nabo bakyanywerera ku modulo eziggyibwamu.
Enkola z'okunyweza obutoffaali eza bulijjo-Okunyweza obutoffaali:
Ebikwaso by'obuveera nga biriko snap-ebituukagana .: Esinga obuseere, nnungi nnyo ku kukuŋŋaana kwa waggulu-obunene, naye weegendereze creep - PA66 gf30 ejja kuvunda wansi w'omugugu ogw'olubeerera waggulu wa ~50℃.
Enkomerero-Okusiba kwa plate .: Ennyiriri zonna zinyigirizibwa wakati wa collector plates ku nkomerero zombi.
adhesive bonding .: ddala Tesla ky’akola.
Bonding erina eddirisa ly’enkola enfunda ennyo.
adhesive entono ennyo → amaanyi g’enkolagana agatali gamala.
Ebingi → bikulukuta ku cell sidewall, nga birumya okutambuza ebbugumu.
Obudde bw’okuwonya kwe kulumwa omutwe okulala. Ku project emu twakozesa henkel structural adhesive (loctite something, tetusobola kujjukira grade entuufu) that spec'd 24 h cure at room temperature, naye layini yaffe yokka yakkiriza 4 h grell time. Twamaliriza nga tukyusa okutuuka ku 60℃/ 2 h heat-Assisted Cure, ekitegeeza okugattako ekifo kyonna eky'ebbugumu n'okuddamu okukola ensengeka ya layini.
A quick note ku thermal pad thickness .(Kino kibuuzibwa nnyo):
- Paadi ya mm 0.5 .Ebiseera ebisinga akuba ku 3–5 w/m·k.
- Paadi ya mm 1.0 .Egguka waggulu-Ebyokulonda eby’okuziyiza (ebimu bituuka ku 6–8 W/m·K), naye okuziyiza okw’ebbugumu kwonna bulijjo si kusingawo olw’obuwanvu obw’enjawulo.
Olina okuddukanya ennamba za buli musango. Paadi eziwanvu zikola okunyiga okugumiikiriza okusingawo stack-Up (nga abakola obutoffaali n’abakola pack bombi baagala), naye omulimu gw’ebbugumu ogusembayo gulina okukakasibwa ne hardware entuufu.
Ku bikwata ku bifo ebinyogoza okunnyika .- Sirina mikono mingi-Ku bumanyirivu, kale sijja kuteebereza. Kye mmanyi nti ebyetaago by’okusiba biba bya bukambwe (IP67 oba wadde IP68), era okukwatagana kw’ebintu n’amazzi ga dielectric kikulu nnyo - obuveera obumu bugonvu oba buzimba nga bunywezeddwa. Xing Mobility mu Taiwan ekoze pulojekiti nnyingi ez’okunnyika; Empapula zaabwe enjeru zikwata nnyo era zisaana okusomebwa bw’oba oyagala.
