Electric Vehicles

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Electric Vehicles are a key part of our tomorrow and how we get there. If we can get all the fossil fuel vehicles off our roads, out of our seas and out of our skies, we'll have a much better environment. This community is where we discuss the various different vehicles and news stories regarding electric transportation.

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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 5 months ago by Sunshine@lemmy.ca to c/electricvehicles@slrpnk.net

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[–] cron@feddit.org 4 points 5 months ago (4 children)

Very detailled comparison about to very different cell types. BYD seems to focus on price, whereas the Tesla cells have a 50% higher energy density (and thus probably more range).

I did't read the full article, as it is a bit too technical for me.

[–] yessikg@lemmy.blahaj.zone 3 points 5 months ago (3 children)

People are choosing BYD, because once you have good enough charging infrastructure, range doesn't matter as much as price

[–] cron@feddit.org 3 points 5 months ago (2 children)

Aditionally, the LFP cells from BYD seem to be more efficient with fast charging, while Tesla's cells get hot and need much better cooling - emphasis mine.

Comparing this specific heating per volume, the Tesla 4680 cell creates around 2× 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 2× 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 strategy for fast charging.

[–] Sentau@discuss.tchncs.de 4 points 5 months ago* (last edited 5 months ago) (1 children)

This is specific heating per volume. Considering that the Tesla cell has ~80% more volumetric energy density (643.3 Wh/l vs 355.3 Wh/l), if normalize the specific heating per unit of charge (instead of volume), the BYD cell is now only around 10% better.

TLDR - the Tesla cell is 1.8 times the energy density so 2 times the heating for 1.8 times the charge added.

[–] cron@feddit.org 2 points 5 months ago

Thanks for your remark. It's easy to misinterpret technical papers like this one from OP.