Certainly Nissan will have some input into the standardization for Level 3 (rapid) charging. I'd be interested in seeing the standard involve the *charger* providing coolant for the battery pack. That way, the vehicle doesn't need a massive cooling system for when you get to really high power (60kW on up) -- just ductwork. Why should the vehicle have to haul around such a big refrigeration system? Why should each vehicle have to have one? And level 3 chargers cost so much, it shouldn't make a big price difference for them.
And it gets better: if you have your power wires go down the center of the charging cord and the outbound coolant go around them, your cable gets actively cooled. So you don't need to have as heavy of conductors -- a really big deal at high currents. As for coolant, I like the thought of using supercritical CO2 -- there should be no issues with disconnection or contamination or loss of coolant that way. It's lightweight, so that should further help reduce cable weight, but still enough density to store a significant amount of heat. It's extremely low viscosity, so it should be able to go through even the smallest spaces in the battery pack. And since it's nonconductive, you could probably just pump it freely into the pack on one side and collect it on the other. Downsides include a relatively high minimum temperature and high pressure.
And it gets better: if you have your power wires go down the center of the charging cord and the outbound coolant go around them, your cable gets actively cooled. So you don't need to have as heavy of conductors -- a really big deal at high currents. As for coolant, I like the thought of using supercritical CO2 -- there should be no issues with disconnection or contamination or loss of coolant that way. It's lightweight, so that should further help reduce cable weight, but still enough density to store a significant amount of heat. It's extremely low viscosity, so it should be able to go through even the smallest spaces in the battery pack. And since it's nonconductive, you could probably just pump it freely into the pack on one side and collect it on the other. Downsides include a relatively high minimum temperature and high pressure.