Roland via EV wrote:
Did any of you monitor the voltage of the most negative cell and the
most positive cell during the charging cycle and discharge cycle
using a very high charging system?...
Did not have any BMS back in the 70's at the time. During the
discharging cycle which may be up to 800 motor amperes, the most
positive cell would always end up less voltage than the most positive
cell.
There has been anecdotal evidence of this for many years. It's sometimes
seen in big UPS that use many small batteries in series, or in big
industrial batteries.
The effect seems to be caused because batteries at the positive or
negative ends of the string also being at the outside ends or corners of
a pack. They run cooler there, as a consequence of having more exposed
surface area.
--
A designer knows he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
-- Antoine de Saint Exupery
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
_______________________________________________
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)
