Rich, before we say this is next to impossible, let's remember that Nissan's Altra runs LiIonP batts. Clearly they've developed a system, b/c 150 of them were cruising CA streets on lease not long ago at 140 mi/chg., and I read about EV-1 fires, but not Altra fires. Respectfully,
--- Rich Rudman <[EMAIL PROTECTED]> wrote: > Victor Tikhonov wrote: > > > > Having constant voltage source by itself is no > guarantee > > against overheating/overcharging. > > > > You don't necessarily need a charger per cell, but > you do need > > at least a thermal sensor on each cell. > > > > All the sensors should talk to the charger. > > > > Regarding charging profiles, they are developed > and in fact > > in many cases not that different from PbA alg, > except > > for thermal compensation and full charge > detection. > > > > Consider this: > http://www.thunder-sky.com/qxt/Curve-2.htm > > They recommend simple CC/timed CV method > (provided, you > > monitor temp and compensate for it). > > > > Also combining tracking Ah in/Ah out with dT/dt > should > > be sufficient as well. > > > > A charger better have downloadable (in > non-volatile memory) > > profile ability with programmable timers for each > charging > > phase. It has to have means to be throttled/shut > off by > > external sensors and optionally - by an Ah > counter. > > Not terribly complex, but bad boys are definitely > out... > > > > Victor > > > > jerry dycus wrote: > > > > > > Hi Bruce and All, > > > Most Li-ion batts have a charger on each > cell > > > to keep it inside it's thermal limits. So just a > > > constant voltage source should be all you need. > > > jerry dycus > > > --- Bruce EVangel Parmenter <[EMAIL PROTECTED]> > wrote: > > > > If li-ion batts become affordable and > available, my > > > > next > > > > question would be > > > > -what chargers have a charging algorithm for > li-ion? > > > > > > Bruce, Victor, Gary LIon dreamers ET al. > > It's real simple you screw up a Lion 100 amp hour > cell and you need a > Scatter shield. > Over charge and you plate out metalic Lithium.. it > soaks up O2 and > starts a fire, BANG!. > We will need Temp of each Cell, voltage of each > cell, some mechanisim > to shunt power around from a really full cell. And > oh yea the system > will need to know WHICH cell is in trouble. > MK3s at least, maybe the MK4 with multi cell > scanning. > The charger will need to have a fully programmable > memory, and some > really nifty temp and amp hour tracking and curve > tracing. > Even at this... the battery control system will be > impressive. > > -- > Rich Rudman > Manzanita Micro > www.manzanitamicro.com > 1-360-297-7383,Cell 1-360-620-6266 > __________________________________________________ Do you Yahoo!? Faith Hill - Exclusive Performances, Videos & More http://faith.yahoo.com
