Dɛn Ne Batere Akorae?
"Adan a ɛwɔ dan mu".kyerɛ nhyehyɛe a ɛwɔ batere mu a ɛkura nkwammoaa no na ɛhyehyɛ no. Ɛte sɛ nea ɛyɛ mmerɛw, nanso nkyerɛase pɔtee a wɔde ma wɔ asɛmfua yi ho no gu ahorow kɛse wɔ adwumakuw biara mu. Bere a na mewɔ Rivian no, obiara frɛɛ no "cell carrier." Bere a mitu kɔɔ Koreafo Tier-1 adwumakuw bi nkyɛn akyi no, emu nkrataa nyinaa kaa ho asɛm sɛ "module housing." Ade koro, edin soronko.
Mayɛ adwuma yi mfe 11 ni, na ebia mede bere pii ayɛ compartment design sen subsystem foforo biara. Ɛnyɛ sɛ mfiridwuma no ankasa yɛ den titiriw nti; ɛyɛ nea ɛkame ayɛ sɛ ɛne biribiara a aka no abɔ mu denneennen nti. Sesa compartment no dimension baako, na ɛsɛ sɛ wosan -yɛ thermal, structural, ne assembly simulations nyinaa bio.
Ma memfa m’adwene nsi nkwammoaa a ɛho ahonhon tumi so - eyi ne baabi a makɔ afiri a ɛsen biara mu.
Obiara nim sɛ prismatic nkwammoaa hohoro wɔ charge/discharge cycles mu, nanso sɛnea ɛhohoro ankasa no gu ahorow kɛse a egyina nea ɔde ma no data so. Mahu CATL datasheets ka sɛ 8% nkwa nna nyinaa swelling ma tumi a wɔde ama, bere a Samsung SDI list 12% ma cell a wɔde toto ho. Sɛ wobisa wɔn mfiridwumayɛfoɔ a, wɔka sɛ "sɔhwɛ tebea ahodoɔ." Emu nea ɛwɔ he na ɛteɛ? Obiara nnim ankasa. Enti wɔ nhyehyɛɛ mu no, bere nyinaa yɛfa asɛm a enye koraa-asɛm no bo (12%) na afei yɛde 1.2× ahobammɔ ade foforo di dwuma.
Wɔ afe 2021 mu no, meyɛɛ adwuma wɔ adwuma bi mu maa US OEM (mintumi mmɔ wɔn din). Ná ɔdan no awiei mprɛte no yɛ dade a wɔde 2.5 mm stamped ayɛ. Yɛtuu mmirika du du pii CAE iterations - stress ne deformation nyinaa hwɛɛ yiye. Afei, bɛyɛ asram 14 wɔ SOP akyi no, afuw mu huammɔdi fii ase guu mu Bere a yɛtetew pack ahorow no mu no, na ɛda adi sɛ mprɛte a ɛwɔ awiei no akotow akɔ abɔnten. Ntrɛwmu puei wɔ gap filler ne cold plate ntam, ɔhyew a ɛko tia no tow kɔɔ soro, na na nkwammoaa binom retu mmirika digrii 7–8 a ɛyɛ hyew sen wɔn afipamfo. BMS no antow mfomso biara efisɛ na ennya nkɔɔ aboboano no, nanso na onyin a ɛkɔ ntɛmntɛm no yɛ nea wontumi nkwati. Awiei koraa no yɛdan kɔɔ 4 mm die-cast aluminium end plates so na asɛm no yerae.(Merenka sɛnea na saa rework bill no te sɛ nea ɛte no ho asɛm.)
Dɛn nti na simulation ankyere no?
Efisɛ na swelling-force load case a yɛde maa CAE no yɛ mfomso ara kwa. Wɔsusuu nea ɔyɛɛ nkwammoaa no ho nsɛm wɔ digrii 25 a ɛkɔ so daa . Nokwarem no, sɛ kar no retwa Phoenix ho ahyia wɔ awɔw bere mu a, pack mu hyew taa boro digrii 45 . Electrolyte ɔhyew ntrɛwmu + SEI nkɔso ntɛmntɛm=ankasa ahohoro tumi a ɛkorɔn koraa sen datasheet bo. Obiara nnim dodow pɔtee no. Saa asiane no akyi no, minni simulation nkutoo mu ahotoso bio - seesei yɛhyɛ hot-chamber high-temperature cycling validation wɔ design foforo biara so.
Nkwammoaa a ɛyɛ kurukuruwa yɛ asɛm foforo koraa.
Wɔ 21700 anaa 4680 mfe no mu no, wɔn radial stiffness dodow no ara fi toa no ankasa mu; axial ntrɛwmu yɛ ketewaa bi. Nea ɛhaw adwene titiriw ne ɔkwan a wɔfa so de ntam kwan ne ɔkwan a wɔfa so si hɔ.
Tesla 4680 structural pack yɛ ɔkwan a ɛyɛ anigye: wɔde ade a wɔde nkata so bata nkwammoaa no ho tẽẽ wɔ soro ne ase nkratafa no so, na ɛdan nkwammoaa no yiye ma ɛbɛyɛ adesoa-asoa asɔremma.
Mfaso kɛse:yi mu duru a ɛwɔ atetesɛm dan mu dan mu no fi hɔ.
Ade bɔne kɛse:zero serviceability - cell bɔne baako na pack no nyinaa yɛ scrap.
Ankasa, misusuw sɛ saa aguadi-off yi yɛ ntease a edi mũ ma Tesla adwumayɛ kwan (vertical integration + gigacasting adwene), nanso ɛnfata OEM biara a ɔde serviceability di kan. Ford ne GM mfiridwumayɛfo a me ne wɔn akasa no da so ara si so dua sɛ wɔmfa module ahorow a wotumi yi fi hɔ.
Akwan a wɔtaa fa so de cylindrical-cell fixation:
Plastik brackets a ɛwɔ snap-fits: ne bo yɛ mmerɛw, eye ma high-volume nhyiam, nanso hwɛ yiye wɔ creep - PA66 GF30 bɛsɛe wɔ adesoa a ɛkɔ so tra hɔ a ɛboro ~50℃ase .
End-plate a wɔde kyekyere: wɔpiapia row no nyinaa wɔ collector mprɛte ntam wɔ n’afã abien no nyinaa.
Adhesive a wɔde kyekyere nneɛma ho: nea Tesla yɛ no pɛpɛɛpɛ.
Bonding wɔ adeyɛ mfɛnsere a ɛyɛ teateaa koraa.
Adhesive kakraa bi dodo → bond ahoɔden a ɛnnɔɔso.
Dodow → ɛboro so kɔ nkwammoaa no nkyɛnmu, na ɛyɛ ɔhyew a ɛkɔ baabi foforo no yaw.
Bere a wɔde sa yare yɛ tiyɛ foforo. Wɔ adwuma biako mu no yɛde Henkel structural adhesive (Loctite biribi, mintumi nkae grade pɔtee) a spec'd 24 h ayaresa wɔ dan mu hyew, nanso yɛn line nkutoo ma kwan ma 4 h tra bere. Yɛwieeɛ no yɛdanee kɔɔ 60℃/ 2 h heat-assisted cure, a ɛkyerɛ sɛ yɛde heating station mũ nyinaa bɛka ho na yɛasan ayɛ line layout no.
Nsɛm a wɔakyerɛw ntɛm wɔ thermal pad thickness ho(wobisa eyi pii):
- 0.5 mm a wɔde hyɛ mumpɛn pii no, ɛkɔ soro wɔ 3–5 W/m·K.
- 1.0 mm a wɔde hyɛ mubue akwan a ɛkorɔn-conductivity options (ebinom du 6–8 W/m·K), nanso total thermal resistance nyɛ bere nyinaa na eye esiane extra thickness nti.
Ɛsɛ sɛ wotu mmirika kɔ nɔma ahorow no ma asɛm biara. Pad a ɛyɛ den no twetwe tolerance stack-up pii (a cell yɛfo ne pack yɛfo nyinaa ani gye ho), nanso ɛsɛ sɛ wɔde hardware ankasa di ɔhyew adwumayɛ a etwa to no ho adanse.
Ɛdefa nsu mu nsu mu onwini adan ho- Menni nsa{1}}ho osuahu pii, enti merensusuw ho. Nea menim ne sɛ, ahwehwɛdeɛ a ɛfa nsɔano ho yɛ atirimɔdensɛm (IP67 anaa mpo IP68), na nneɛma a ɛne dielectric nsuo no hyia no ho hia - plastic binom yɛ mmerɛw anaa ɛho ahonhon berɛ a wɔde ahyɛ nsuo mu. XING Mobility a ɛwɔ Taiwan no ayɛ nnwuma pii a wɔde hyɛ nsu mu; wɔn nkrataa fitaa no yɛ nea ɛkɔ akyiri yiye na sɛ w’ani gye ho a, ɛfata sɛ wokenkan.
