snake_eyes21458 t1_is1yksv wrote on October 12, 2022 at 6:39 PM

The faster a battery is charged though the greater the capacity loss over time. I am curious how that issue can be addressed.

40for60 t1_is5qk3k wrote on October 13, 2022 at 2:30 PM

that isn't how it works, speed of charge is about resistance heat and keeping the battery and charger cool the number of times that you charge has been historical the issue with wearing out the batteries cathode but that is becoming less of a issue as cathodes are getting better.

snake_eyes21458 t1_isaepfj wrote on October 14, 2022 at 1:52 PM

I think we are both saying the same thing, you are just getting more into the details. The faster chargers generate more heat which is what causes that loss in capacity. My statement was based on the SAE EV Engineering program which presented several studies showcasing number of cycles to 10% loss in capacity and when going from .5C to 1C the cycles went from 5000 to 200 cycles.

snake_eyes21458 t1_isafmmi wrote on October 14, 2022 at 1:59 PM

After doing some more digging it looks like the study I mentioned used Nissan Leafs which don't have a robust thermal management system for their batteries (they are air cooled) so newer EVs probably perform much better.

40for60 t1_isaggkk wrote on October 14, 2022 at 2:05 PM

right, the heat would be a issue if they weren't managing the thermals and since batteries are getting much bigger the cycles are going down so there is less strain on the cathodes along with cathodes just getting better. I think most batteries will far out last the suspensions and bodies of cars.