On Wed, Jun 3, 2015 at 10:50 AM, Paul Dove via EV <[email protected]> wrote: > Yes I suppose this is confusing. Let them ion batteries are charged according > to a procedure. Let's take lithium iron phosphate for example. > According to the procedures you charge to 3.65 V constant current. Then you > hold the voltage at 3.65 and taper the current to C/20. >
Remember that that procedure was developed to reduce time to charge and the chance that the batteries get overcharged while still reaching 100%SOC or nearly so. If time to charge were not an issue just charge to 3.38V and shut off whenever you feel like it. I haven't had time to collect data on the relationship to target voltage and cutoff current but I suspect it is not linear. Since my Zivan charger doesn't have the ability to terminate based on charge current I have it set to 3.445V/cell. It times out at any where between about 45 and 60 minutes after reaching the "yellow" phase of charging. Through no-load tests this time of "trickle charging" is not overcharging the batteries. All cells rest at below 3.38V after 8 hours or so which supports what Michael R. said above. -- David D. Nelson http://evalbum.com/1328 http://www.levforum.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)
