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Where did you get the power output of a M3 pack? And 100kW would be weak in a Model S, their packs deliver hundreds of kW. Or do you mean kWh (energy)? A 100kWh pack wouldn't even fit in a M3, the largest size that fits at present (according to Musk) is 75kWh. M3 packs are going to be lower power than S packs, they supercharge slower, and there's no guarantee that they'll have the same form factor / attachment points. Plus S and X packs have an unlimited mileage warranty.
I really see no point to this.
Supercharge slower, REALLY?
If true, Superchargers queues would get longer.
Yes, really. 130mi/30 minutes on a 220 mi pack means about 40 minutes to 80%, not 30. Same situation with the long range pack, 170mi/30 minutes on a 310 mi pack.
They're larger format cells. Heat doesn't leave as quickly. That's always the balance, energy density vs. heat issues.
You forget that superchargers split power between two vehicles when the station is busy. Charging two Model Ss or Xs from near empty at the same time means a big slowdown for both. With two model 3s there's almost no slowdown at all. Protip: if you have to share a charger with someone, share with a Model 3!
If heat transfer inside cell sets limit, then larger pack should charge 1.41 times faster.
Next gen supercharger will fix this
It charges 1,3x faster, which is close enough. There's many factors that go into determining the safe charging speed, but in general it's roughly linear with the number of cells.
The supercharger has no bearing on how quickly heat leaves the cells.
Difference between 1.3x and 1.41x is so large
that there must be reason for it. Supercharging speed is one of largest advantages Tesla has over competition.
They are designing charger that will help remove heat from cells.
I wouldn't call it large at all. Both variants supercharge significantly slower than S/X, and this is expected because they're larger format cells.
If you want a faster-charging car, pony up more cash and get an S. If you want a car that starts at $35k, this is what you get.
You can't remove heat faster from the cells than it can flow from the inside of the cell to the outside of the cell**. I'm sorry, but this is a hard limitation. You have a balance: do you want energy density and lower manufacturing costs, or charge speed and maximum power output? Pick.
** The only thing you can improve is lowering the temperature of the coolant, which theoretically a supercharger with an external coolant feed could do. But 1) don't bet your life on such support in the vehicle for a charger that doesn't yet exist, and 2) S will always be faster than 3, due to the smaller format cells. Also, you'd be limited on the extent that you do this; if you cool the exterior of the cells too much (with the interior remaining too heat limited), you hurt cell life even more (charging li-ion cells in freezing conditions is a bad thing). Also, glycol freezes at -13°C anyway, and starts getting viscous before then.