It probably isn't practical for racing since many changes may be needed to get an edge in competition, but that operation looks like a robot could do a lot of that work, and then battery packs could be made profitable enough to pay for the robotics after selling 1000 packs or so. But you would have to have a market for 1000 packs. It would take a bit of doing to ensure good QA, but some old printer parts and custom jigs would give a table 2-D mobility and precision. Some 3-D printed arms could position the cell tangs and ensure the welder is in position before it made the spot. If I was unemployed, this would be a fun kickstarter.
But since I'm a beginner, the large format cells are probably what's best for me. Those AMD packs sure are tasty though! sean On Tue, Sep 3, 2013 at 3:42 PM, Bill Dube <[email protected]> wrote: > Making large packs from small cells is the expensive way to build a > battery pack. However, you get a _lot_ of performance from smaller > cylindrical cells. That is why people do it. > > It is best if the cells are at approximately the same SOC when you weld > them together, but they don't have to be. > > A new cell welder costs ~ $15,000 or more. If you know the parts you are > looking for, you can get something on Ebay for $3500, maybe less if you are > patient and hunt around. (The $175 Harbor Freight spot welder will not do. > You need an entirely different welder.) You need a double pulse inverter > welder capable of 4000 amps. You need a "fine spot" dual welding head. > > You can see the welder in action at: > http://www.youtube.com/watch?**v=tQkf7jN2D1g<http://www.youtube.com/watch?v=tQkf7jN2D1g> > > Bill D. > > > At 11:50 AM 9/3/2013, you wrote: > >> If I am going to go with a spot welded pack what battery has a proven >> track record? Are they affordable? People used to talk about 1 dollar >> batteries. Do these exist? When buying a thousand batteries what kind of >> a deal can you get? Once you make a module these batteries are literately >> joined at the hip. Now one charger in effect is needed per module. I love >> the concept. Bill Dube does this. Can mere mortals do it? Will a 175 >> dollar Harbor Freight spot welder hold up after thousands of spot welds. >> Lawrence Rhodes... >> > > ______________________________**_________________ > UNSUBSCRIBE: > http://www.evdl.org/help/**index.html#usub<http://www.evdl.org/help/index.html#usub> > http://lists.evdl.org/**listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> > For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/* > *group/NEDRA <http://groups.yahoo.com/group/NEDRA>) > > -- Sean Korb [email protected] http://www.spkorb.org '65,'68 Mustangs,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera #1382 "The more you drive, the less intelligent you get" --Miller "Computers are useless. They can only give you answers." -P. Picasso -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130903/0df76865/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)
