First time spot welder. Got the cheapest sunkko welder and it would not weld properly. So I got a bigger one, and it seems to blow out my welds a bit. If I use lower power they don’t stick. I’ve cleaned the electrodes, used firm pressure. And I just can’t get it to look as nice as some factory welds.
I had it set too high at the beginning (left) and can get reliable welds toward the right. Replacing the batteries in a portable power bank that got left in a hot car too many times. Once I get confident I’ll move on to the 12s7p monster on my desk.
There’s a laser cutter at work, I’ll try and get some time on it and cut rings. Real fish paper seems hard to find, so I’ll just have to make rings with what I got.
As for burnt points, I’ll try spreading out the probes a bit. Don’t want to go over the edge of the terminal.
Remove all nickel strips, clean your cells, buy precut fish paper rings and adhesive fish paper. and start over, make 6 weld points (3 sunko discharges), protect all spots where the strips will touch the cells, use silicone wire to connect p-groups not nickel strips.
On every step take a picture and ask for forum members approval, don’t rush the job, the longer you take the safer you and your house will be.
No battery will be 100% safe ever, all we can do is to try to reduce the risk
It is real fish paper from Amazon. Did burn test and soaked resistance test. Each weld is 3 or more discharges and the strip rips before the welds break.
I can’t use copper bus bars as it’s a 7p and the vertical strips would come off the pack at an angle. I will be re enforcing the p groups with silicone wire and covering the balance wire strip with fishpaper.
Those welds are too deep. The metal is twisted and some welds are out of the positive button creating a most likely short.
Please listen to eboosted and rebuild the whole thing.
I’m going to quickly regret not finding pre cut stick on rings aren’t I?