4 ms·

> It will get a software update and will charge faster in no time. This is certainly possible, especially if the reason for the slow charge is that the cells w

by addaon 3y ago

> It will get a software update and will charge faster in no time. This is certainly possible, especially if the reason for the slow charge is that the cells were rushed into production so fast that Tesla didn't have time to characterize them, and don't know what charge conditions will damage them. On the other hand, the 4680s have been in production, in one form or another, for quite a while now, including in Model Ys which show the same slow charge performance, so it's also certainly possible that the cell quality is such that they can't be fast charged without damaging them, regardless of software tweaks.

pyaamb 3y ago
This brings up a newbie question that Ive been wondering about for a while - Is it feasible to design an EV platform that can be upgraded to other battery chemistries? The idea of purchasing an EV that a few years down the line can be upgraded to the latest battery tech with a Software update to the BMS is very exciting!
- addaon 3y ago
  The BMS is usually part of the battery assembly, so swapping batteries (to a different chemistry, or not) would generally involve swapping to an appropriate BMS. If the battery voltage is close enough to the design voltage (so no going from a 400 V system to a 900 V system without also changing out inverters, etc), and if the new BMS provides any necessary interfaces, why not?
- lightbritefight 3y ago
  Nio has some battery swap models that let you drive into a bay and it swaps the battery out for you in 5min or so. That design is likely the only one that would really work with a "change the battery chemistry" option. All other electronic vehicles seem to use the battery ad the base of the car in a sled design, so updating the battery would be a 10k kind of affair, if possible.
- clouddrover 3y ago
  > Is it feasible to design an EV platform that can be upgraded to other battery chemistries? Yes. Nio's cars can both charge and swap the battery. They can swap between 75 kWh, 100 kWh, and 150 kWh packs, all of which have the same physical dimensions. The 150 kWh pack is a new semi-solid state battery chemistry and only adds an extra 20 kilos of weight versus the 100 kWh pack: https://carnewschina.com/2023/12/17/nio-et7-with-150-kwh-semi-solid-state-battery-achieves-a-1044-km-range/ https://carnewschina.com/2023/12/17/nio-et7-with-150-kwh-sem...

by addaon 3y ago

pyaamb 3y ago

This brings up a newbie question that Ive been wondering about for a while - Is it feasible to design an EV platform that can be upgraded to other battery chemistries? The idea of purchasing an EV that a few years down the line can be upgraded to the latest battery tech with a Software update to the BMS is very exciting!

addaon 3y ago
The BMS is usually part of the battery assembly, so swapping batteries (to a different chemistry, or not) would generally involve swapping to an appropriate BMS. If the battery voltage is close enough to the design voltage (so no going from a 400 V system to a 900 V system without also changing out inverters, etc), and if the new BMS provides any necessary interfaces, why not?
lightbritefight 3y ago
Nio has some battery swap models that let you drive into a bay and it swaps the battery out for you in 5min or so. That design is likely the only one that would really work with a "change the battery chemistry" option. All other electronic vehicles seem to use the battery ad the base of the car in a sled design, so updating the battery would be a 10k kind of affair, if possible.
clouddrover 3y ago
> Is it feasible to design an EV platform that can be upgraded to other battery chemistries? Yes. Nio's cars can both charge and swap the battery. They can swap between 75 kWh, 100 kWh, and 150 kWh packs, all of which have the same physical dimensions. The 150 kWh pack is a new semi-solid state battery chemistry and only adds an extra 20 kilos of weight versus the 100 kWh pack: https://carnewschina.com/2023/12/17/nio-et7-with-150-kwh-semi-solid-state-battery-achieves-a-1044-km-range/ https://carnewschina.com/2023/12/17/nio-et7-with-150-kwh-sem...