Instead of intercalating, the ions end up plating the surface of the anode. Charging in freezing temps can cause plating, which reduces battery capacity and increases Resistance
Sent from AT&T Yahoo Mail for iPhone On Sunday, April 3, 2022, 7:21 PM, Peri Hartman via EV <ev@lists.evdl.org> 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/ >> >> >> _______________________________________________ >> Address messages to ev@lists.evdl.org >> No other addresses in TO and CC fields >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> ARCHIVE: http://www.evdl.org/archive/ >> LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20220404/2e9ebead/attachment.html> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
