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Battery Cooling: How Important?

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Hey folks,

Talked to someone that was at a Level 3 charger by the airport with their new-to-them Mitsubishi i-MiEV. They previously owned a Nissan Leaf, which would heat up on mountain passes and refuse to charge (or charge very slowly) at Level 3 chargers along the way, making the journey quite a bit more annoying than necessary. We're talking a 5h drive now taking 10+h due to waiting for passively air-cooled batteries to cool down. The Mitsubishi uses the air conditioner and a fan to cool the battery during Level 3 charging, which should be better in theory.

Has anyone experienced this with non-Tesla EVs? How big of an issue is battery cooling regarding long trips and fast charging? (Of course, this is limited to this topic -- battery cooling is great for other reasons as well)

This info will be helpful in deciding a second future EV for myself, as well as EV recommendations for others depending on their driving habits.
In general if you want to retain higher level 3 charging speeds on trips long enough to need multiple charges, then thermal management is essential.

You might like to look at Bjorn Nyland’s YouTube channel who has tested many vehicles on 1000km runs and comments on battery management.
Cooling is required if a) charging speed is above 50kW (for more than 20 minutes) or b) more than one significant charge happens within 4-6 hours (more than half of battery capacity).

If EV supports up to 50kW, has range 150 miles and you need to charge 100 miles only once on the way, cooling is not mandatory.
Battery will cool down without active cooling overnight or during non-hot day.