I'm not looking for any trade secrets, nor even any detailed technical explanation. I'm just trying to figure out in general terms what you're claiming here, and if it makes sense from the viewpoint of thermodynamic energy flow; i.e. "Entropy tends towards a maximum" and all that. Energy has to "flow downhill", so to speak, to power any system. If the energy is going in a circle or going "uphill", then it's perpetual motion and can't work in the real world.
So then, are you saying that the actual source of energy powering the vehicle is either fuel powering a fuel cell (FC), or else an offboard source of electricity used to charge the electrolytes which power a flow battery (FB)?
And that when you say "Basically does not need external electrical charging", you're only referring to a relatively small battery pack used as a buffer in the vehicle... a battery pack which is not the primary source of traction power for the vehicle? That is, you're talking about a FCEV (Fuel Cell EV) or a flow battery BEV Battery Electric Vehicle), where the main battery is a flow battery powered by electrolytes charged from an offboard source, and what you're talking about recharging "with power output of at least one third of rated power drive" isn't the flow battery, but a secondary battery (presumably a li-ion battery pack) carried onboard as a buffer?