You need a very expensive spot welder to weld lithium cells in cans without damaging them. Bill Dube is the expert on this topic but I don't think he's on the list anymore. There's some info on this page: http://www.hightechsystemsllc.com/pt_Batterypacks.html
The harbor freight welder is a good way to end up with a lithium fire. On Tue, Aug 19, 2014 at 9:20 AM, Michael Ross via EV <[email protected]> wrote: > 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 <[email protected]> > 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 > > [email protected] > <[email protected]> > -------------- 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) > > -- www.electric-lemon.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140819/499c725f/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)
