What would be cool is if the EVSE had a "recalibrate" mode where it
first fed power back to the grid and then recharged the EV.
------ Original Message ------
From: "Peri Hartman" <pe...@kotatko.com>
To: "Electric Vehicle Discussion List" <ev@lists.evdl.org>
Sent: 02-Jul-19 6:17:13 AM
Subject: Re[2]: [EVDL] balancing: ?PD.lu purposely maintenance-drain
Tesla-S pack every 20, 000km?
Ah, that makes more sense. Thus, every time I fully charge, I am balancing the
cells. That's what I've been assuming.
To calculate the Wh, though, does one really have to fully discharge ? I guess,
no matter how accurately it can measure current out of and current into the
battery, cumulative errors will appear. But fully discharging an EV battery is
difficult ! How do you do it - leave it in the driveway with the heater
running full ?
Peri
------ Original Message ------
From: "paul dove via EV" <ev@lists.evdl.org>
To: ev@lists.evdl.org
Cc: "paul dove" <dov...@bellsouth.net>; "brucedp5" <bruce...@juno.com>
Sent: 01-Jul-19 8:24:42 AM
Subject: Re: [EVDL] balancing: ?PD.lu purposely maintenance-drain Tesla-S pack
every 20, 000km?
I think people get confused with the term balancing. It is pretty much a carry
over from lead acid batteries where the take all the cells to boiling to get
them to the same voltage at the end of charge. It doesn't apply to Lithium
since this is derogatory to cell life.
I believe what people are experiencing is the algorithm built into the system
that keeps up with capacity from all the data, current, voltage, sag, internal
resistance, temperature........ after a while of short discharges and charges
the capacity value can get off from actual battery capacity and it gets
corrected when you do a deeper discharge.
If any balancing is going on it happens every time you charge... most likely or
when close to fully charged. Maybe some guys who actual take cell data can shed
some light on this but I don't think this is affecting capacity much.
On Saturday, June 29, 2019, 5:44:55 PM CDT, brucedp5 via EV
<ev@lists.evdl.org> wrote:
It took some digging, but I found a EVLN post I made back in Aug 2015 that
might shed some light on this topic, see
http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Offset-Supercharging-degradation-with-pack-balancing-tp4677028.html
... Lost capacity may be restored by “balancing the pack”—that is, charging
it to 100 percent to make sure that each of the cells is fully topped off.
Tesla, of course, is mum on the subject; I’ve never seen any official word
on pack balancing, and the company officially recommends against charging to
100 percent unless maximum range is necessary.
The Model S fan site Teslarati, however, recommends charging the pack to
100 percent every three months or so.
When I asked at my local Tesla Service Center about “pack balancing”, I was
told they did it all the time.
“Discharge it as close as you can to zero, and then charge it as slow as
possible all the way up to 100 percent,” I was told. “You’ll probably get
some capacity back.”
It works!
...
and comments on this topic are shown on:
http://electric-vehicle-discussion-list.413529.n4.nabble.com/template/NamlServlet.jtp?macro=search_page&node=413529&query=tesla+pack+balancing&days=0
For EVLN EV-newswire posts use:
http://evdl.org/archive/
{brucedp.neocities.org}
--
Sent from: http://electric-vehicle-discussion-list.413529.n4.nabble.com/
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