tmho
1 kW
I bought the Sunkko 737G+ spot welder (which should be quite powerful when compared with the other Sunkko models) recently for building my first diy battery pack. So far from my testing, at about 75% power setting, welding with 0.2mm pure nickel strips onto cells is no problem.
But for the series connection, if pure nickel strip is used for maximum current purpose, then that series pure nickel strip will be welded onto the parallel pure nickel strip. The seller had told me that pure nickel strip cannot be welded onto another pure nickel strip. But from youtube (https://www.youtube.com/watch?v=ublFs7IU05c&t=683s), I saw he welded pure nickel strips onto pure nickel strips easily with a Sunkko spot welder just at about 50% power setting. Therefore, I tried with mine at 75% power setting but I failed.
I have heard that Sunkko spot welder is not that reliable. I have not started welding my battery pack yet. I do not want it break down before I finish my pack, so before trying mine at 100% power, I would like to check here if anybody got successful experience in spot welding pure nickel strip onto another pure nickel strip, especially with Sunkko welders.
If that is not possible, for the series connection, I will try to use nickel plated strip first and then on top of the nickel plated strip I will weld another pure nickel strip. Is this a good way and/or possible way to increase the output current of my pack?
But for the series connection, if pure nickel strip is used for maximum current purpose, then that series pure nickel strip will be welded onto the parallel pure nickel strip. The seller had told me that pure nickel strip cannot be welded onto another pure nickel strip. But from youtube (https://www.youtube.com/watch?v=ublFs7IU05c&t=683s), I saw he welded pure nickel strips onto pure nickel strips easily with a Sunkko spot welder just at about 50% power setting. Therefore, I tried with mine at 75% power setting but I failed.
I have heard that Sunkko spot welder is not that reliable. I have not started welding my battery pack yet. I do not want it break down before I finish my pack, so before trying mine at 100% power, I would like to check here if anybody got successful experience in spot welding pure nickel strip onto another pure nickel strip, especially with Sunkko welders.
If that is not possible, for the series connection, I will try to use nickel plated strip first and then on top of the nickel plated strip I will weld another pure nickel strip. Is this a good way and/or possible way to increase the output current of my pack?