The battery builders club

Weld on a piece of aluminum then bend it flat

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Like a square tab of aluminum? Not nickel?
I was hoping to use the 8mm nickel strip I already have.

@lazopm Why is the middle strip necessary? Planning on putting that many amps through it?

No, when you weld the nickel together you do it ontop of aluminum instead of the cells so you don’t blow through, then you remove the nickel (it shouldn’t weld) and bent the nickel flat against the cells

Middle strip of nickel is useless, you don’t even need the one connecting left and right (just have a diamond)

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@ZachTetra he wants to weld 3 strips to the group. So the middle one is not on top of a cell

Just extend the middle strip. If you do this, make sure your solder makes good contact with each individual strip.

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Al drawing dicks

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Surely i get bonus points

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You do…but then I think of the fact he has to bend it :hushed::dizzy_face:

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Layer the nickel from one side to the other. This will help you get good solder coverage on each strip

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But yeah as these 2 other regulars have mentioned, just either use 2 in a diamond pattern or extend the middle one to the cell at the top end. In both cases, make sure you weld the ends of the nickel strips together to keep electric flow consistent. You could mark the angle on the strip with a marker and then weld them together on top of an aluminum bar before welding them to the group

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Good to know about the aluminum, I’ve been welding nickel to nickel on top of cork and it stinks.

I’ll try @glyphiks’ suggestion, seems like the easiest.

@Flasher I saw some conflicting information about how many strips to use, rather err on the side of caution in case I do a shitty job and one of the strips comes off from vibrations.

Thanks for the help everyone!

Just don’t do a shitty job? Seems to always work for me :woman_shrugging:t3::joy::wink:

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This is almost exactly what I do. I mark the strips on an aluminium heatsink and tackweld the pieces together.

You should not be relying on nickel to nickel welds to carry all of the current, this is why I recommend making sure the solder connects well with all tabs

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Its great that you are thinking about this :+1: i build all my packs with thoughts like that in mind.

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Ok guys. I need a spot welder to make a battery pack.
It doesn’t have to be fast or commercial grade. Not tying to break the bank. What are my options? Anyone located in Florida I could pay to zap together some Pgroups?

@longhairedboy should be a localish one?

I’ll send you a broken Sunkko 709a for shipping cost if you want to try fixing it

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I’m pretty sure that question has been answered a few times on this thread

There’s only 7660 posts to shift through. Hope you understand why I asked

Nothing from Florida specifically

@Soflo do you need it to be local? I can order some cells, weld them, then forward them…I think most other people are farther north or west