Does anybody know what kind of current these can handle? Because this could make soldering custom packs even easier and less dangerous - you just solder the wires to the magnet and put it on the battery after all the soldering is done.
Not sure how bad vibrations are for this type of connection though.
Yep, the heat will kill those magnets in a hurry. Plus, after they are soldered to the magnets, what will keep the magnets from moving off target? Before you get the solder to stick to the magnet, a piece of metal like that will get super hot. And the whole corrosion/conductivity angle… Too sketchy…
Bite the bullet and get a spot welder. It really is the “right” way to put together a battery pack. Unless you are really a stud at soldering, I would NOT try soldering direct to cell. IMO
Has anyone ever actually had an event related to direct soldering to cells? I mean here, on this forum. I know there’s anecdotal evidence on the tubes but I’m trying to gauge whether I should go for it or spring the $175 for the eBay spot welder…
I got one of my good cells that i own and my old 80W soldering iron and pushed them together behind a small blast shield and had it sit there for 25 minutes, the worst thing that happened was some of the electrolyte leaked out of the top of the cell. That was at the 5 minute mark. The cell was around 350C at that point and later reached 450C. Never exploded.
@DougM I was about to solder a 10s4p pack with 18650s and realized as I was getting prepped that it would be 100+ soldered joins to make. I bought the spot welder to save time and to eliminate the risk of damage to the cells.
Some cells have a coating of stuff on them i have found, not sure what it is. Also, some cells aren’t actually nickel, so scrubbing is very helpful.
Even if it is nickel and there is no oxide layer, scuffing the surface can still allow for a quicker and easier made joint.
I have soldered hundreds of cells over the past year and i am about to solder a crap ton more and i always scruff them with a light sanding wheel on my dremmel. Takes a few seconds per cell.