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Hmm batteries don't have range, vehicles have range. Battery have energy storage capacity and I don't see it listed anywhere very annoying. I bet a could get 4

Hmm batteries don't have range, vehicles have range. Battery have energy storage capacity and I don't see it listed anywhere very annoying. I bet a could get 470 miles out of 75kwh battery under the right conditions with the right vehicle. A Chevy Silverado EV got 1000 miles out of a 200kwh and its a brick. Saying a battery has range is a nonsensical statement. Tell me how much energy it stores and how much it weighs thats whats important.

kragen 1y ago
Gravimetric energy capacity limits range, which is why ICE cars outcompeted electric cars for a century until the batteries got Goodenough. Basically the problem is that, once most of the vehicle's weight is battery, adding 5× the battery capacity adds 5× the weight and thus 5× the rolling resistance, so it only increases the range slightly. LFP has historically been inferior to other lithium-ion chemistries like NMC in gravimetric energy density, so the range of the resulting vehicle is a major consideration.
- deleted 1y ago
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- _ea1k 1y ago
  I understood that reference. :) One funny thing though... the issues have had more to do with volumetric energy capacity than weight. See also tests like this: https://www.youtube.com/watch?v=UmKf8smvGsA https://www.youtube.com/watch?v=UmKf8smvGsA That's why vehicles like Semi trucks can get by with batteries that are only ~4x bigger than a Silverado EV, weigh 8.5x more, and still manage to also produce higher ranges.
  - kragen 1y ago
    Hmm, really? Maybe I'm not understanding the most important issues.
loloquwowndueo 1y ago
TFA says it’s 470 miles of range under the WLTP which seems to be a fairly standardized test procedure for light vehicle fuel economy and emissions. One could in good faith assume it means “install this in a normal light vehicle (sedan?) and you’re likely to get about 470 miles of range when driven under normal conditions”. That said I agree that range is NOT the best way to measure a battery’s energy storage capacity - definitely not the right unit, it’s like measuring computing capacity in megahertz. Oh wait :)

kragen 1y ago

Gravimetric energy capacity limits range, which is why ICE cars outcompeted electric cars for a century until the batteries got Goodenough. Basically the problem is that, once most of the vehicle's weight is battery, adding 5× the battery capacity adds 5× the weight and thus 5× the rolling resistance, so it only increases the range slightly. LFP has historically been inferior to other lithium-ion chemistries like NMC in gravimetric energy density, so the range of the resulting vehicle is a major consideration.

deleted 1y ago
[deleted]
_ea1k 1y ago
I understood that reference. :) One funny thing though... the issues have had more to do with volumetric energy capacity than weight. See also tests like this: https://www.youtube.com/watch?v=UmKf8smvGsA https://www.youtube.com/watch?v=UmKf8smvGsA That's why vehicles like Semi trucks can get by with batteries that are only ~4x bigger than a Silverado EV, weigh 8.5x more, and still manage to also produce higher ranges.
- kragen 1y ago
  Hmm, really? Maybe I'm not understanding the most important issues.

loloquwowndueo 1y ago

TFA says it’s 470 miles of range under the WLTP which seems to be a fairly standardized test procedure for light vehicle fuel economy and emissions. One could in good faith assume it means “install this in a normal light vehicle (sedan?) and you’re likely to get about 470 miles of range when driven under normal conditions”. That said I agree that range is NOT the best way to measure a battery’s energy storage capacity - definitely not the right unit, it’s like measuring computing capacity in megahertz. Oh wait :)