Regarding cycling speed on a HV high capacity pack, the ideal situation would be to simply split the existing pack in 2 and shuttle charge back and forth at a high rate, plus a limited amount of additional energy to make up for losses in the process (charge/discharge efficiency as well as losses in the electronics)
Seeing that you have 240 Cells so roughly 300V pack, the two halves would be 150V at 95Ah which is almost 15kWh each. If you can pump 5kW from one pack half to the other and you have a combined 80% efficiency, you need to add a constant 1kW which can be done from a 110V outlet and you'd need 3h per half cycle, 6h for a full cycle and the whole process (if automated) would take a full day and night... Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of David Miller via EV Sent: Tuesday, June 09, 2015 6:17 PM To: Michael Ross Cc: Electric Vehicle Discussion List Subject: Re: [EVDL] Large Format NiMH Battery Patent Expirations? Thanks Michael! As to the legality of manufacturing and selling Large Format NiMH: http://en.wikipedia.org/wiki/Patent_encumbrance_of_large_automotive_NiMH_batteries Battery reconditioning? I'd need to pull the batteries and find another vehicle. At 65 hours per cycle, 3 cycles per cell and 240 cells that figures to 46,800 hours (over 5 years!) to reconditioning with a superbrain989. Lee Hart's battery balancer could do the job many times faster. 2340 hours at TheHybridShop. Here is the HybridShops' email: "Well, the theory of the conditioning process working is right on.....the issue will be the time it would take. These are 95 amp hour batteries. When you compare that to the 5.5 - 6.5 amp hour batteries in the hybrids things get very, very time consuming. A discharge using the BDU would likely take over 20 hours if the pack was fully charged. A charge cycle would take over 45 hours. The charger supplied with the BDU has a max charge rate of 2.5 amps. So, could it be done yes.....but it would be weeks worth of work. The discharger only has 20 channels so it would take more than one discharge (at over 20 hours each) for every cycle and then the approximately 45 hours of charge time for each cycle. It would take one full cycle (initial discharge, 100% SOC charge, power/energy test) just to see what the pack condition is (like on any hybrid) but with the time involved that could be a pretty big cost only to find out the pack may be suffering from irreversible changes. These packs are utilized much differently than hybrids (deeper cycling during normal use) so they will age differently. It could be an interesting project but.. " -David Miller -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150609/5b615f51/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) _______________________________________________ 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)
