Well, then, why is the range substantially less in cold weather ? The
charger nor the battery don't know the discharge rate while charging.
I understand that charging needs to be slower. But how does that affect
capacity ?
As a matter of example, during 20F weather last december, I was getting
20 miles range on the Leaf at full charge. Yesterday, charging while
50F, I went 30 miles and still had about 1/3 bars left.
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------ Original Message ------
From: "Cor van de Water" <cor.vandewa...@gmail.com>
To: "Peri Hartman" <pe...@kotatko.com>; "Electric Vehicle Discussion
List" <ev@lists.evdl.org>
Sent: 03-Apr-22 16:32:59
Subject: Re: [EVDL] kWh versus charging temperature
Peri,
It is the *speed*, not the *capacity* that suffers in very cold weather.
Think of it as ions moving sluggish through the lattice that makes up
the active material.
The colder, the more sluggish.
Forcing too much current into this can even cause faults to develop,
which *are* reducing the capacity permanently, not because of the cold
but because of the fault blocking the path of current in that section
of the lattice, taking a little bit of the total capacity out of the
picture.
That is why charging must be slow in the cold, to avoid creating those
faults, so that the capacity of the battery remains, albeit at lower
*power* (=speed of current in or out of the battery).
Hope this clarifies,
Cor.
On Sun, Apr 3, 2022 at 3:50 PM Peri Hartman via EV <ev@lists.evdl.org> wrote:
As I understand, with most Li-ion cells, the colder the cell, the less
charge it will take on. Correct ?
But what happens if a warm battery is charged and then cools off ? It
still has all its kWh, right ? And further, the temperature of the
battery does not affect how many kWh you can get *out* of it, though the
rate may change a bit.
My 2011 Leaf has abysmal range at this point. I'm wondering if I were to
charge during the warmest part of the day, would I get a bit more range
? I'm going to guess it won't make that much difference since the
battery is in the shade (under the car) and won't warm up much over a
few hours. But I'm still curious if the theory holds truth.
Peri
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