Peri,
I'm no chemist but I do know that batteries just do not
perform well when cold and 20F is cold for a battery. That is why my 1994
Solectria came equipped with heaters in the battery boxes. It is true that
Nissan doesn't have a heater for the battery?
On Sun,
April 3, 2022 7:21 pm, Peri Hartman via EV wrote:
> 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.
>
> << Annoyed by leaf blowers ?
https://quietcleanseattle.org/ >>
>
> ------
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
>>>
>>> << Annoyed by leaf blowers ?
https://quietcleanseattle.org/ >>
>>>
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>
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