I'm not sure about the newer models, but definitely no battery heater
(or cooler) for the 2011 model.
Anyway, no one has yet addressed whether my hypothesis is true or not:
if you charge while the battery is warm, it will still be able to
deliver all the kWh even when the battery has become cold (though at a
slower rate).
Peri
<< Annoyed by leaf blowers ? https://quietcleanseattle.org/ >>
------ Original Message ------
From: unityc...@uninets.net
To: "Peri Hartman" <pe...@kotatko.com>; "Electric Vehicle Discussion
List" <ev@lists.evdl.org>
Sent: 03-Apr-22 18:49:16
Subject: Re: [EVDL] kWh versus charging temperature
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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