Storing LiIion batteries is usually not the problem, although it is
recommended for long life to not store them fully charged, especially
not in hot environment.
Damage is done when (fast) charging in cold - the colder, the slower
they need to charge to avoid damage.
Nissan Leaf only has battery warmers, those will only come on when the
car is on or plugged in and below a certain temp (I believe -30)
I don't know about the Volt, it might simply stop maintaining the temp
when the EVSE is disabled, you can find out by simply trying and see if
state of charge of the Volt changes when the EVSE is not enabled.

-----Original Message-----
From: EV [] On Behalf Of Peter VanDerWal
via EV
Sent: Thursday, January 25, 2018 7:40 AM
Subject: [EVDL] LiIon thermal management question (Chevy Volt)

I've noticed that if I leave my Volt plugged in and the outdoor
temperature gets very high or very low the Volt will occasionally draw
power for 10-15 minutes.  I assume this is the thermal management system
working to keep the batteries at their "optimal" temperature.
What I'm wondering is how important is this (if any) to extending the
life span of the batteries?
I'm guessing that when it's cold out, keeping the batteries warm just
improves performance and that it won't hurt the batteries to spend a few
hours at 20 deg F.
However, what happens when it's 90 deg out?
The reason I'm asking is if it's not critical when the car is parked,
I'd like to avoid wasting 1-3 kwh a day.  I can always re-enable the
EVSE before driving the car so the batteries will be at their designed
temperature when being discharged.
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