Thats good but thermal monitoring is necessary with many chemistries. Every laptop battery I have every taken apart had thermal sensors on each cell.
Sent from my iPhone > On Mar 8, 2017, at 10:33 AM, John Lussmyer via EV <ev@lists.evdl.org> wrote: > > On Wed Mar 08 08:08:01 PST 2017 ev@lists.evdl.org said: >> Would you share what you're doing to build a BMS, what you've learnt etc? > > This is my 5th BMS version. > I originally had units with little micro computers on them, and all kinds of > nifty digital features. (revs 1 - 3) > PITA to program, reliable communications difficult, expensive, and was hard > to detect individual unit failures. > While it was "fun" to watch all the individual voltages on a display, it > wasn't especially USEFUL to do so. > > Rev 4 and 5 have gone back to a simple analog system. > It detect undervoltage, overvoltage, and has up to 200ma of bypass balancing. > The only output of the units is a single small LED on each reg (on is good!), > and a single wire output that is daisychained from unit to unit. > The wire is a current loop, so if ANYTHING goes wrong (unit fails, wire comes > loose, cell goes completely dead, etc..) you loose signal. > My in-cab indicator is a green LED that is on if all is good, and a buzzer > that goes off if something is wrong. > I've also hooked up a small relay to shut off the charger if "something > wrong" happens. > > > -- > > Worlds only All Electric F-250 truck! > http://john.casadelgato.com/Electric-Vehicles/1995-Ford-F-250 > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at 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 Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
