I voted for "Electric Spot welder for lithium batteries..
You may want to see these video's (same channel for the 2nd one, but I think it's his girl friend talking now..)
Interesting. I currently have 3 microwave transformers, a lot of high powered lithium cells for RC cars. Single cell, 2s, 3s. One broken spot welder, heave gauge wire to re-wire the transformer to to fix the broken one. But for the same reason I’ve stayed away from lithium battery videos, is the same reason I stay away from transformer videos. I don’t want someone don’t something and being injured, or worse.
But as I’ve sat back and watched more lithium battery videos pop up, people blowing them up, cutting them open, using cells they shouldn’t that have formed internalmshunt shorts from overtraining and go into thermal runaway. I finally decided that people will do what they want despite the risk or following videos with wrong information. So it’s better that I do some videos and try to keep mine accurate and informative. If someone watches a video that conflicts what I’m saying, then they might decide to do more research before doing something that could burn down the house over night.
But as for using microwave transformers, and mains voltage videos. I think I will still stay away from them. So I’m not making a spot welder, it’s more of what one will work for your project. The normal research a product, buy, test, test some more. Decide the best bang for the money with accessories it comes with. Most of them work great on 220V, but on 110V seem to have issues or die after a few uses. This is what I was looking for was one that woildmwork good for everyone. But if people still decide to build one, they can. I just won’t being doing that video.
Even on those videos he melted through two strips of 0.2 nickel plated steal, that’s enough to put a whole in the battery and cause a chemical reaction. There’s a lot of fake 18650 cells also, and only a few real sellers that I know of. Even big Clive unwrapped a cell and parts of the inside started to catch fire from the reaction to being exposed to the air. If this was contained in a metal tube with a smalll whole thenlresjre would build up. Then AVE tried a home made one from a 12V car battery and out a whole in a 18650 cell and it got hot fast. People think packs are discharged because they read 0V and tear them down with metal tools and some cells shorted out and were to hot to touch , but that’s the cutoff circuit on the pack. Then they discover the cells still had power after the tear down.
So a lot of bad videos with bad info on these batteries, some chemistries are safer then others. Some release hydrochloric acid fumes when exposed to air and people are wearing dust masks that don’t block any fumes and burn the inside if their lungs.
So if I do this video I think I want to recommend a decent spot welder for 110V and 220V mains, has extras included, and address some of the myths and safety concerns people should know before building that new pack for a electric bike.
Scott
P.S. I might also be receiving a Tesla module as well. It’s in the works, I hope it works out. Should be interesting to explain how these packs are built like bricks.