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    spot welders

    Contemplating building a bigger pack. Can anyone recommend a good welder or a good DIY project welder?

    Mahalo
    Renn

    #2
    I got this one,SUNKKO 737G 1.5kw spot welder machine led light welding machine for 18650 battery pack off aliexpress. Cost $110. It works but probably could make one that works just as good for cheaper.

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      #3
      Those lower priced machines require you to lift the battery pack up to trigger each spot. Seems like a drag. I would much prefer the pen type, with a foot switch.

      I am working on putting together a DIY spot welder from a 12V motorcycle battery, motorcycle starter relay, momentary button, and solid copper wire for contact ends. I'll post to this thread when it's done, and report results.

      Jose

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        #4
        I finished putting together my 12V DIY welder, and found that I will would have to buy another battery of at least 350CCA to have enough energy for welding .2mm strips. I also found that the welding pen connections heated up really fast, even with my little 150CCA battery. Given the heat issue and cost of buying a battery, I ended up buying one of those little Sunkko 737 110V welders with a foot switch, and my results are mixed. IT doesn't have enough power to weld .2mm strip, but it works really well with .1mm strip. Pliers are needed to remove strips once tacked down, and they will tear at times. I would check welded strips periodically as I was assembling the first part of my pack, and I am confident the welds are all solid. I looked around, and find videos of folks who replace the inner wiring from transformer to welding probes/pen, and they report 100A increases in power. That might be enough to let the Sunkko units weld .2mm strip reliably. I also understand that the 220V version of the welder is more powerful and might be better for welding the thicker strips.

        I am half way through welding my pack, and multi-layering the .1mm strips on my cross battery, and cross parallel group connections should be good to feed the theoretical peak 30A my controller could pull. For home users that don't weld many batteries on a regular basis, I think the Sunkko units are probably the most convenient solution.

        Jose

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          #5
          Update: tightened all bolts, returned to functioning (duh!)
          ---------------------------
          Hi, I got this portable spot welder to make a 10s2p 18650 battery with 3000mAh cells.
          This is my first try at building a battery myself. I hot glued the cells together to hold them in place.
          As you can see, the first 24 or so welds worked fine.
          Then the welder stopped having a welding effect.
          I recharged the battery, it shows 4.15 v across the contacts.
          Anyone have experience with this type of tool, any suggestions?

          Thanks!

          Click image for larger version  Name:	WhatsApp Image 2020-07-27 at 15.02.35.jpeg Views:	0 Size:	170.0 KB ID:	110738Click image for larger version  Name:	WhatsApp Image 2020-07-27 at 15.02.56.jpeg Views:	0 Size:	167.3 KB ID:	110735Click image for larger version  Name:	WhatsApp Image 2020-07-27 at 15.03.13.jpeg Views:	0 Size:	150.8 KB ID:	110736
          Attached Files
          Last edited by amaryeh; 07-27-2020, 05:54 AM.

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            #6
            You want a quality Spot welder for a decent price check out K-Weld. The unit costs less than $200 and you need to get a Lipo battery to power it up $60. I have been making batteries for a couple of years and started off with the Sundko unit and it would weld ok for a single layer of nickel strip. After adding additional layers for my connections they would come loose. Then I went with the Vruzend Caps and mechanically bolted up everything. That was ok but took up a lot of room. We have our batteries inside the main triangle of our bikes and with the Vruzend kits, inside a Luna Bag I could get (8) groups of 14 (52v) 27.6ahr. Now using the K-weld with a nickel 4 row belt for my connections I am getting (11) groups of 14 (52v) 37.95ahr. This thing will weld ou anything you can throw at it. A single strip on a battery I set the power level to 30jl. When adding another single layer I run iy up to 40jl. This thing will go to 250jl!!!!. I typically do (3) pairs of welds per battery connection and I can do one whole side (154) batteries before it drops 1 volt on the Lipo power supply. Check out K-Weld the guy is an Electronics Engineer out of the UK and he will answer any questions you got. And no I'm no affiliated with them in any way.

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              #7
              K-Weld https://www.keenlab.de/index.php/shop/
              and
              DIY Arduino Battery Spot Welder Kit https://malectrics.eu/product/

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