People who build racing packs, such as Lightning Motorcycle, use brands not really available to "hobbyists/converters" such as Enerdel. Enerdel expects that their cells (in pairs, each on one side) are sitting against a metal sheet that is heatsink for the cells, this is brought out to the side and can be pressed against a surface that conducts the heat away.
I asked Derek Barger from High Tech Systems and he did not want to reveal which pouch cells he is using and I did not want to press him, I was happy enough that he would entertain me on my visit to his place and discuss EVs and battery packs in general and his racing designs specifically. He noted that he could reach extreme high power and energy density because he did not need to contain the pouches, they never swelled and never got hot, he only needed to stabilize them against the vibration and G forces of racing. He did include a BMS with his packs though. Then there is the famous A123 20Ah pouch cell that sustains 20C, in other words that small cell can dish out 400A and almost melt its own tabs off. I do believe that it needed containment (pressure from the side) to avoid swelling up. Just some more datapoints. 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 http://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 via EV Sent: Friday, January 15, 2016 8:21 PM To: Paul Dove Cc: Electric Vehicle Discussion List Subject: Re: [EVDL] Leaf donor car? Re: Books on converting a car to ev? Thanks Paul. I had seen those C references on this list in the past but had no clue what the significance was. > On Jan 15, 2016, at 10:08 PM, Paul Dove <[email protected]> wrote: > > I can try to explain the significance. > > I believe he uses Kokam LiPo cells. The have a very high energy density. They can operate continuously at 10 C but will cause heating and capacity loss... C being the capacity of the cell so a 2Ah cell can put out 20 amps continuous and up to 8 C without significant heating (around 50 degrees Celsius). > > The KOK 340 HSC can be operated at 20 C. The effect is that the user can tailor a pack to do what is needed without excessive size, weight, capacity and cost. > > John has a very small powerful pack but without having a high capacity since he's drag racing. > > Sent from my iPad > >> On Jan 15, 2016, at 8:19 PM, [email protected] wrote: >> >> Paul replied: >> >>> John metric uses lithium polymer batteries like the ones used in quad copters. >> >> Can you enlighten the ignorant on the significance of that? It doesn't mean anything hing to me. _______________________________________________ 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)
