Hi Peak and All, Try this maybe from earlier posts I found this new Li battery charge, monitor and possible cell balancer like Lee's does though electronically and at far, far less parts count.
AS8506 smart cell-monitoring ICs But I don't have the expertise to tell if this is a good IC for a quality but low cost BMS with active balancing but if it is will cut the cost of installing lithium and keeping them alive at a reasonable cost. It sells for $9.10 in 1,000 lots for the IC and each covers 7 cells. It seems to be for E bikes but can it work on higher amphr cells? , Cor's answer, The datasheet says it is a monitor/balancer. Balance current is 100mA and what I understand from the description is that a single external resistor is multiplexed between the high cells, so worst case if you have 1 low cell and 6 high cells, each high cell effectively is connected to the resistor 1/6th of the time So - balancing is very minimal but may be enough if the pack si allowed time to balance and the imbalance is small. Note that each chip draws from the batteries that it is monitoring, so if there is imbalance in the supply current between chips then that can be a cause of imbalance in the pack even though that draw is 1000 times smaller than the balancing current. Note that the chip is autonomous - it does not need an external controller to do the balancing. Balancing can be passive (resistor) or active (I presume pumping the energy from the high cells into a low cell) Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.com Skype: cor_van_de_water XoIP: +31877841130 Tel: +1 408 383 7626 Tel: +91 (040)23117400 x203 On Saturday, April 19, 2014 1:27 AM, Peakfoto Digital Photo Still n Video <[email protected]> wrote: 6 cell lfp pcm needed I have a yard blower than comes with a wimpy 4 am battery, like 10 minutes worth of blowing. I have some 40ah TS . but I need a 6 cell pcm. that 'll balance while charging and LVC/HVC also. high speed on the blower draws 20 amps. and maybe 30 starting. this are one is hard to find. on top of that I'd like to find a manufactor/ country that treats employees with respect . can't seem to find a american seller. any ideas? _______________________________________________ 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) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140419/5146283a/attachment.htm> _______________________________________________ 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)
