I don't know, but the voltage choice is a bizarre boundary case. A car needing over 500 V is probably way over 500 V - like 720 V nominal - so even the fully discharged voltage is probably over 500 V and no charging can occur at all.
Are you considering a pack around 500 V nominal, so a 500 V max charging station could take the pack from fully discharged to roughly half-charged, if it interprets a 550 V request that way?
Thanks Brian. 550V was plucked out of the air. I'm considering a pack with around 510-520V terminal voltage, expecting to be able to charge to 75/80% on older DC chargers. The OBC will support 500+V for 100% charge.
The idea is you don't generally charge much past this on DC anyway and this design has higher nominal voltage for improved capacity, efficiency and higher charge/discharge power (for the same current).
Most newly installed chargers appear to provide 150-920VDC, even those that are power-limited to 50kW so it would be a non-issue on those.
I am curious how the CCS2 protocol behaves if the car requests higher terminal voltage than the supply. Whether it will charge with requested current until 500V and then taper, or whether it will refuse the vehicle for incompatibility..?
EDIT - 0% voltage of around 430V.