Also, I've had several ThunderSky cells arrive at zero volts. Charged
them up and all but one came back to full capacity.
Bill D.
At 06:37 PM 3/2/2013, you wrote:
Does anyone know the 'do not go below' voltage at which the anode
starts to break down in LiFePO4? I know it's somewhere at or below
2.0V but that's about all.
My car is parked for the winter. The other day, I went to fire it
up & check on the batteries and my BMS refused to unlock it. Some
investigation revealed that one of my ThunderSky cells was at 1.16V!
(the rest were all at 3.345V). It may have been at that level for
weeks or only hours, I really have no idea. So, after kicking
myself for not disconnecting the BMS when I took the car off the
road, I disconnected everything (I once before saw this particular
module spontaneously turn on a balance resistor, but after several
months without incident I thought I'd fixed the cause). Today I
came out to remove the cell from the pack and discovered that it had
recovered to 2.245V! It may have helped that temperatures have been
pretty cold here in New England. I'm gently trying to nurse it back
to health in an isolated area with a close eye on voltage,
temperature, and amp-hours, but I'd want to understand the chemistry
better before I felt comfortable putting it back in the ca
r.
I tried looking around the EVDL archives and the internet but
couldn't turn up any numbers on the cell chemistry. What's the
voltage below which actual damage occurs? Does the fact that the
voltage recovered mean that it was not, in fact,
over-discharged? Or does it just mean that with things disconnected
the chemistry stabilized at some minimal potential?
Thanks in advance,
-Ben
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
For EV drag racing discussion, please use NEDRA
(http://groups.yahoo.com/group/NEDRA)
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
For EV drag racing discussion, please use NEDRA
(http://groups.yahoo.com/group/NEDRA)
