Does anyone know if they have looked at how charging quickly impacts the longevity of the battery? Can the cells be damaged by the rapid increase in temperature and current?
I don’t specifically know for this type of battery but I’ve looked at pretty in-depth analysis of smartphone batteries (way less sophisticated battery management tech) and fast versus slow charging made very little lifespan difference. The best mitigations were fewer cycles and keeping the battery in its sweet spot (not discharging to 0% and charging to 100%)
BYD is using, among other methods, a "3D direct refrigerant cooling system", so the batteries are dipped in phase-changing coolant.
Aside from that the cells are pre-warmed and were optimised for lower internal resistance.
There’s a graph i imagine here where slow charging, you want to retain all capacity. Faster it gets, you tolerate more battery loss.
Of course that is normal fast charging. Flash charging is 3x or more faster, so that's unknown.
Regular users should only use these stations for road trips. Nearly all charging should be done with L2 chargers.