What about extra QC time?
What about existing QC stations without enough kW for larger batteries?
Those are easy to estimate.
There is no such thing as QC station that is not powerful enough. There are really slow QC stations but they can
charge 90kWh Tesla's pack no problem
Let's suppose 50kW infrastructure will be "available enough" (and 100kW will be the dream of the future),
charging time for 60kWh pack from 0% to 80% will be like an hour
24kWh pack can take up to 7kWh in 10 minutes. But only at really limited charge state (somewhere between 5%-40%).
On 60kWh it will look something like:
56kWh real capacity
12,5% 07kWh - 10 minutes
25,0% 14kWh - 20 minutes
37,5% 21kWh - 30 minutes
50,0% 28kWh - 40 minutes
62,5% 35kWh - 50 minutes
75,0% 42kWh - 60 minutes
85% 47,5kWh - 70 minutes
92% 51,5kWh - 80 minutes
95% 53,0kWh - 90 minutes
Let's not forget that ChaDeMo is always limited to 1 hour by default.
It will be reasonable to charge for 1 hour max on 50kW charger as usually starting SOC will be 5-15%
and with no active cooling too much heat will be accumulated in the cells, like twice as much.
If Nissan will offer 100kW charging on 60kWh Leaf2 then we can be quite sure that there will be active
cooling inside the battery. Most likely air cooling like e-NV200 has but that is absolutely enough.
They say that 60kWh pack will be really really low resistance but I don't believe that. 20%, maybe.
Charging faster than 50kW is going to make a hell inside a passive pack. Think of that this way:
passive cooling is like constant number. It just cools down when you drive. But if you charge
twice as fast you gain heat at 2x speed compared to 24kWh Leaf. Charging once will not be a problem.
Charging twice on the other hand will not be possible. And in Germany on autobahns people can deplete
Leafs really fast. Even if top speed will stay the same depleting 60kWh pack will take an hour.
If they are stupid enough not to offer AC heat exchanger in the pack (as an option, like 7,2kWh charger or QC port)
they will fail hard. Even if they get packs resistance low it will not stay that way for half a decade.
Most likely they don't even know right now will they get chemistry good enough to stay away from cooling or not
This year they will feel the pain for doing that mistake in 2011 - a lot of owners will get a new battery this year
On the other hand it's not the charging temperature that kills the battery. It's the average temperature.
On the third hand (
) some regions won't buy Leaf2 if it doesn't have active cooling, even if they
"get the chemistry right". Buyers in hot climates want to tick a box in options list called: "battery cooling".
I wouldn't. I don't need that. I'll be fine with the warranty only.
Base price will stay the same so win-win for everybody.