I've heard this same thing but was not clear on how low of a rate. Does anyone
know? Around C/10? Or lower?
-ChrisChris' 1972 BMW 2002
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WebPage Vehicle 1972 BMW 2002 Motor Advanced DC Series Wound DC Drivetrain 9"
motor, standard ... |
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From: Michael Ross via EV <[email protected]>
To: Danpatgal <[email protected]>; Electric Vehicle Discussion List
<[email protected]>
Sent: Friday, February 20, 2015 6:03 PM
Subject: Re: [EVDL] Cold Charging Lithium Experiences
I have seen some of the research on this - if you charge slowly you can
avoid any plating. The issue is the electrolyte becomes vicious and the
ions pile up on the SEI outside the cathode. What I saw said the problem
was at -20C (-4F). But, I am not sure exactly what the cell construction
was, and particularly the electrolyte composition. There are umpteen
electrolyte recipes and they make a difference. One thin they do is use
lower boiling point electrolytes to improve cold performance. If the cell
is for a human implant you don't have to worry about it. Lot's of variety.
I think you should heat the pack, and charge as slowly as you can just to
be sure. Plating is really bad.
Mike
On Fri, Feb 20, 2015 at 3:25 PM, Danpatgal via EV <[email protected]> wrote:
> Reviving this thread as we're having another very cold stretch here in the
> Eastern US.
>
> My batteries (SE130 CALBs) are still going, but boy do they sag when it's
> cold like this. It's annoying.
>
> I've been charging when my BMS sensors (atop each cell) are over 0C, which
> they have generally remained over the past few weeks despite the cold
> (thankfully my garage generally stays above 0C).
>
> But, my follow-up question on all this is if the BMS measurement is good
> enough. For example, I guess there is resistive heat that gets generated
> upon charge/discharge/shunting that probably make the sensors read higher
> than the cells themselves. How much, I don't know.
>
> Does anybody have any thoughts, experience on this? We've gotten down to
> -20C with a HIGH today of only -10C ... yet I'm charging. I didn't really
> want to do it, but I was dragging so much on the road with low SOC%, I had
> to, or risk having to really limp home.
>
>
>
> -----
> Dan Gallagher
> http://www.evalbum.com/3854
>
> --
> View this message in context:
> http://electric-vehicle-discussion-list.413529.n4.nabble.com/Cold-Charging-Lithium-Experiences-tp4667675p4673895.html
> Sent from the Electric Vehicle Discussion List mailing list archive at
> Nabble.com.
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>
--
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Michael E. Ross
(919) 550-2430 Land
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