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Old 11-25-2022, 12:07 AM   #11 (permalink)
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Quote:
Originally Posted by oil pan 4 View Post
May need to build your own I bet there's a few on youtube.
Yep, was afraid of that.

Every now and again it surprises me when I need to invent something, but then again those are market opportunities. You'd think making battery packs was a common enough thing there'd be a fantastic tool.

I did invent a white LED headlamp in 1999 by soldering in my own resistors and LEDs into a bulb I crushed and wired everything into.

Invented supercapacitor battery per Lasersaber's success.

I'll reiterate that solving the problem that most troubles you and making it available for purchase is probably the most straightforward path to financial wellbeing. I call those million dollar ideas, which I used to dream up with more frequency because youth is more creative. I'm down to about one a month these days.

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Old 11-25-2022, 01:56 AM   #12 (permalink)
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Ideas are a dime a dozen. I've had a few myself.

First principles first. Does it need to be welded at all? Would a gas-tight connection suffice?

What solution would en-tool you to face additional challenges in the future?
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Old 11-25-2022, 02:45 AM   #13 (permalink)
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Eh, you start with screwdrivers and the collection grows from there, and before you know it you've got strut spring compressors, battery capacity meters, and the contemplation of an oscilloscope.

I'm trying to pull current sufficient to start a vehicle from small cells in series. Good connections are required.
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Old 11-25-2022, 08:31 AM   #14 (permalink)
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A very informative video.






Link to a 18650 spot welder

https://www.ebay.com/itm/30442246160...Bk9SR_a3yuuVYQ


This is not a endorsement.

I have no personal experience with this welder.

Though it looks like it gets the job doneÖ





>

.
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Old 11-25-2022, 10:46 AM   #15 (permalink)
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Many use the transformer out of a microwave oven, but I am fairly certian there is some disassembly and rewinding involved. Harbor fright used to have a decent cheapo spotwelder, not good enough for production but adequate for home use. ( low cycle duty)

I have a parked 2.5 kw 48 volt server UPS that probably has transformers capable,, but it weighs a hundred pounds
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Old 11-25-2022, 01:50 PM   #16 (permalink)
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Quote:
Originally Posted by Piotrsko View Post
Many use the transformer out of a microwave oven, but I am fairly certian there is some disassembly and rewinding involved. Harbor fright used to have a decent cheapo spotwelder, not good enough for production but adequate for home use. ( low cycle duty)

I have a parked 2.5 kw 48 volt server UPS that probably has transformers capable,, but it weighs a hundred pounds
I have that one it's my sten gun spot welder. It can to a several welds before it needs to cool off for a while. Still only about a 3% duty cycle.
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Old 11-30-2022, 09:43 AM   #17 (permalink)
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2mm thick nickel strips? Muh gawd thats thick. Why?
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Old 11-30-2022, 12:41 PM   #18 (permalink)
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Quote:
Originally Posted by hayden55 View Post
2mm thick nickel strips? Muh gawd thats thick. Why?
I don't know if that's necessary yet.

I'm trying to start a car with these cells, so I need to be able to pass 250 amps through them.
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Old 11-30-2022, 02:12 PM   #19 (permalink)
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I think most of the spot welders for sale are geared more towards hobbyists making batteries for "toys" like remote controlled cars, drones, ect.
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Old 11-30-2022, 03:19 PM   #20 (permalink)
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i would think 2mm would be bolt on or you will need to spot weld and stack multiple strips. i think my headway cells that will start a car were like $50 with the 1.5mm thick bolt on nickel strips

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