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by garolittle
Aug 04 2020 2:37pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

So I am about to start spot welding a 22S/20P pack. I have read the discussion threads regarding cleaning the electrodes and battery cell surfaces and I think I am all set. Most people recommend fine grade sand paper to keep the electrodes clean but what is the best cleaning method for the cells? I ...
by garolittle
Jul 17 2020 9:19am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

agniusm wrote:
Jul 17 2020 8:10am
Received mine:

Image

Image

Thanks
Looks good. Get ready for the best spot welder you have ever used:-)
by garolittle
Jul 03 2020 11:58pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

I would like to ask users of kWeld, how is the status of heat, working temperature? I do not see any sink heaters, or fan? Thanks for answers... Wear a good pair of gloves and point a fan at the pack and the cable holders while welding. Take short breaks to let things cool off. Also, some people us...
by garolittle
Jun 29 2020 6:40am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

Yes sir. That’s the difference. Excellent engineering of the Kweld
by garolittle
Jun 28 2020 4:36pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

It is an amazing product isn't it? Welcome to the Kweld World. :)
by garolittle
Jun 23 2020 12:06am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 386
Views: 64563

Re: Spot Welding Copper Strips to 18650 Battery Cells

Not sure if anyone here has tried this but we have been getting very consistent/strong welds using “Nickel Silver”. It does not actually contain silver and is comprised of 65% Copper, 18% Nickel and 17% Zinc. We used a Kweld for the experiments and wanted to share some pictures. 3AF801B8-7BB5-434A-9...
by garolittle
Jun 22 2020 7:13am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

Interesting idea :-) Don't expect too accurate results please, as kWeld isn't a precision istrument. I use to measure low resistances with a bench power supply and a multimeter: set the supply to as much current as possible and connect it to the ends (I have decent crocodile clips for that). Then u...
by garolittle
Jun 22 2020 12:23am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

You can also try spotweld pulse with long strip. Like 10-30cm or so with electrodes on oposite ends without a cell. That could give most accurate results regarding resistance difference of different materials. Very clever idea. I will try it. Thanks for the suggestion Yep. It worked. It makes sense...
by garolittle
Jun 21 2020 11:22am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

ossivirt wrote:
Jun 21 2020 1:13am
You can also try spotweld pulse with long strip. Like 10-30cm or so with electrodes on oposite ends without a cell. That could give most accurate results regarding resistance difference of different materials.
Very clever idea. I will try it. Thanks for the suggestion
by garolittle
Jun 20 2020 7:13pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

Would the resistance reading after a spot weld be a good proxy for the resistance of the material being welded (assuming the strips are identical in size and are being spot welded to the exact same battery)? I had success in spot welding two different materials (SigmaCLAD and “Nickle Silver”) using ...
by garolittle
Jun 17 2020 11:49am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 386
Views: 64563

Re: Spot Welding Copper Strips to 18650 Battery Cells

That is AWESOME. Like the "Dodge Viper" of spot welders. LOL
by garolittle
Jun 16 2020 11:57pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 386
Views: 64563

Re: Spot Welding Copper Strips to 18650 Battery Cells

serious_sam wrote:
Jun 16 2020 11:42pm
garolittle wrote: I am guessing he intended to say .12mm. :-)
Possibly. But have you seen his monster mosfet array?! :lol:
Ok.... Now I need to see this machine. Someone post a picture so I can engage in "wishful thinking" like I do when I browse the Sunstone Welder website. :lol:
by garolittle
Jun 16 2020 8:26pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 386
Views: 64563

Re: Spot Welding Copper Strips to 18650 Battery Cells

serious_sam wrote:
Jun 16 2020 8:11pm
ridethelightning wrote:
Jun 16 2020 8:00am
1.2 mm copper
Wow, that's thick. I wouldn't have thought that that's even possible.
I am guessing he intended to say .12mm. :-)
by garolittle
Jun 15 2020 7:35pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 386
Views: 64563

Re: Spot Welding Copper Strips to 18650 Battery Cells

spinningmagnets wrote:
Jun 15 2020 11:37am
Yes, builder just posted that the kWeld joule setting is 50J...

The nickel-plated copper strips from the kWeld supplier seems to need about 80J
Nice! Very impressive. Thanks for posting that.
by garolittle
Jun 15 2020 9:11am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 386
Views: 64563

Re: Spot Welding Copper Strips to 18650 Battery Cells

spinningmagnets wrote:
Jun 14 2020 5:59pm
From ES facebook. 20S / 6P, copper sandwich method.

Molicel 21700 P42A cells, 0.10mm copper sheet, plus 0.15 nickel squares only to facilitate welding.

BatteryCopperBus1.png
That is impressive. Kweld used?
by garolittle
Jun 14 2020 9:26pm
Forum: Battery Technology
Topic: Cell-level fuse idea
Replies: 15
Views: 583

Re: Cell-level fuse idea

methods wrote:
Jun 14 2020 10:30am
Good thread - the kind of thing we are looking for.

thanks for contributing

-methods
Thanks sir. I’ve been working hard on this. I know this is a popular idea so it is very interesting to hear everyone’s a opinions and suggestions. Thanks for all that you do for the forum. Gary
by garolittle
Jun 11 2020 1:25pm
Forum: Battery Technology
Topic: Cell-level fuse idea
Replies: 15
Views: 583

Re: Cell-level fuse idea

Very good testing video. I have not seen that. Thank you.
by garolittle
Jun 09 2020 8:27am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

serious_sam wrote:
Jun 09 2020 5:46am

Sounds promising. They'll get hot much quicker than copper electrodes, so your holder will have to have good insulation.
I will try and report back. Thanks for the response.
by garolittle
Jun 09 2020 8:26am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

tatus1969 wrote:
Jun 09 2020 5:23am

I'd say your theory is spot on, the copper strips have significantly less resistance and push the current above the limit. I'd also try using partially discharge batteries first.
Thanks Sir and thanks again for making such an awesome product! :thumb:
by garolittle
Jun 08 2020 8:30pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

Sounds about right. You could try with partially discharged packs. That might lower the available current enough to get below the limit. Thanks again. That actually gave me an idea. Would tungsten electrodes be an option since they have higher resistance? That may put me under the 2,000A limit but ...
by garolittle
Jun 08 2020 8:05pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

serious_sam wrote:
Jun 08 2020 7:26pm
Sounds about right. You could try with partially discharged packs. That might lower the available current enough to get below the limit.
Thanks. I really enjoy learning. I pulled about 1,300A with one Lipo but got the “nearly silent” Overcurrent beep when using the two in parallel.
by garolittle
Jun 08 2020 7:08pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1194
Views: 172213

Re: kWeld - "Next level" DIY battery spot welder

I think I know the answer but I wanted to ask in case I’m wrong. Tonight I was spot welding .25 mm nickel plated copper strips (about 65 - 75 joules). I was curious why I encountered an “over current” message when I used two Lipo batteries in parallel instead of using just one Lipo battery. I have s...
by garolittle
Jun 08 2020 12:01pm
Forum: Battery Technology
Topic: Cell-level fuse idea
Replies: 15
Views: 583

Re: Cell-level fuse idea

Keith at "18650 heat shrink and cell holders" has purchased some that is pure nickel. Although, it's possible some vendor has ordered nickel-plated steel to take advantage of a hot new product, by making a counterfeit... Roger that. Keith is a great guy. I will check with him as well. Love the indi...
by garolittle
Jun 04 2020 11:10pm
Forum: Battery Technology
Topic: Cell-level fuse idea
Replies: 15
Views: 583

Re: Cell-level fuse idea

Yes Sir. Cool product. I asked the vendor about it and they said it was nickel plated steel. Love the design though.
by garolittle
May 31 2020 10:54am
Forum: Battery Technology
Topic: Cell-level fuse idea
Replies: 15
Views: 583

Re: Cell-level fuse idea

Vbruun wrote:
May 31 2020 9:27am
Yes IT would work. A commercial product is available - can't remember from where
Roger that and thank you. If you can remember the vendor that would be great. I would love to check it out. Appreciate the response.