Electric Vehicles

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Contrasting a BYD Blade prismatic cell and Tesla 4680 cylindrical cell with a teardown analysis of design and performance (www.cell.com)

submitted 1 month ago by schizoidman@lemm.ee to c/electricvehicles@slrpnk.net

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[–] trk@aussie.zone 4 points 1 month ago* (last edited 1 month ago) (2 children)

Comparing this specific heating per volume, the Tesla 4680 cell creates around 2x of the heat to be dissipated at a 1 C load (Figure 8). Thus, when designing a system with the same power requirements, the cooling needed for the Tesla 4680 cells must dissipate approximately 2x more heat per volume than that needed for the BYD cell at the same load. Therefore, the LFP electrode design is more favorable for designing a cooling strat-egy for fast charging.

Interesting that Tesla is the king of fast charging, despite the technology being objectively worse in a fast charging application.

[–] DrinkMonkey 4 points 1 month ago

Their charging network’s handshake speed is just so far ahead of everyone else, as is their reliability.

Conversely, their vehicles’ fast charging curves are comparatively dog shit.

[–] rbn@sopuli.xyz 4 points 1 month ago

Interesting that Tesla is the king of fast charging, despite the technology being objectively worse in a fast charging application.

As far as I know this no longer the case for several years. Hyundai, Porsche, Audi, Zeekr, Volvo, Kia, Genesis, Nio, Lucid, XPENG, Maserati, Mercedes, BYD, ... all offer faster charging speeds than Tesla. If you sort descending by charging speed on EV database, the first Tesla (model 3 RWD) appears only on page 14.

https://ev-database.org/#group=vehicle-group&rs-pr=10000_100000&rs-er=0_1000&rs-ld=0_1000&rs-ac=2_23&rs-dcfc=0_300&rs-ub=10_200&rs-tw=0_2500&rs-ef=100_350&rs-sa=-1_5&rs-w=1000_3500&rs-c=0_5000&rs-y=2010_2030&s=11&p=13-10

They are still among the most efficient cars however but also there, you'll find good alternatives like the Hyundai Ioniq 6 (for model 3) or Ioniq 5 (for model Y). I think there's also some very efficient models from BYD but apparantly they're not listed in EV database (yet).

[–] humanspiral 1 points 1 month ago

Comparing different chemistries in different cell formats. Much higher density in 4680 cells is due to chemistry mainly. Heat at 1C is at different voltages too.