This all points to why packs of small cells (laptop cells is probably a misnomer these days) that have conductors welded to them (as with Tesla) are a better solution.
Has anyone tried assembling a pack like: https://plus.google.com/photos?pid=5943603287809906194&oid=100767276460953028406 This is the battery I bought for my Organic Transit ELF. A friend of mine who designs a lot of automation for soldering, inductive heating and welding said you might be able to do this with a 240VAC spot welder. For example: http://www.mcmaster.com/#spot-welders/=tckvx1 That battery could be welded up on a conveyor in really high volumes. The connection is stainless steel to stainless steel, no need for grease and goo, no sanding, no loosening. On Tue, Aug 19, 2014 at 12:08 PM, Lee Hart via EV <ev@lists.evdl.org> wrote: > Cor van de Water via EV wrote: > >> Depends on your current. Typically I would say in the order of >>> magnitude of 0.1 mOhm (milliOhm) because a 300A current will then >>> give 30mV drop, which produces 300A x 0.03V = 9 Watt of power loss >>> as heat. >>> >> > Martin WINLOW via EV wrote: > >> At EVERY connection? In a 120V lithium pack that 's 38 x 9 = >> nearly 350W of heat! >> > > No; Cor has it right. And, 0.1 milliohms is a *good* connection. You will > discover that it is damnably difficult to make a connection that good with > aluminum terminals! > > > -- > You never change things by fighting the existing reality. To change > something, build a new model that makes the existing model obsolete. > -- R. Buckminster Fuller > -- > Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.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) > > -- Put this question to yourself: should I use everyone else to attain happiness, or should I help others gain happiness? *Dalai Lama * Tell me what it is you plan to do With your one wild and precious life? Mary Oliver, "The summer day." To invent, you need a good imagination and a pile of junk. Thomas A. Edison <http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 550-2430 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell (919) 513-0418 Desk michael.e.r...@gmail.com <michael.e.r...@gmail.com> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140819/488c0966/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)
