The battery builders club

Good you mention that now that I am basically done… Next time is the charm. :slight_smile:

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This was my solution gave a lot more space in case the solder wicks down the braid. Also the braid is twisting not bending when it flexes witch is much more general on the braid.

Bottom left looks fine
Top ones look cold soldered a bit needs more heat. Mottled surface to solder has surface tension were it joins the nickel are teltail signs of this. hopefully when you added the braid it reflowed and fixed it. Add a little flux to the nickel and braid helps massively with big heat sucking things like this.

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Yeah, I started pushing them together to loosen the braid before bending it, as I figured that gave it more room to bend freely.

After using the pliers as heatstop and making everything faster, it actually went fine.

Kwelllllllldddddddd!!!

:joy::joy::joy:

I haven’t tried the malectrics, but I have no reason to. The kweld is an amazing piece of hardware.

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Out with the old


In with the DIY

10s4p meepo upgrade here we go!

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Should fit like legos

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P groups done!

Triple stack!

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That’s gotta be thicker than a height of the enclosure, no? 3D printing a spacer or something? Bms going near the voltage indicator?

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Yes, no and yes.

Will be using a thicker gasket. It is about 1/4 inch too tall

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Managed to get the real deal, 12 mm wide and rated at 40 A

Overkill for how I will use but it’s the smallest they had

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Kapton needed or not? Or is fishpaper fine?

I have to admit, I don’t understand why people keep using kapton tape in here. I’ve used none on my builds. Kapton tape is a high dielectric material that resists high voltage arcing, and high temperature stability (400c). Neither of which should occur in a battery. It’s thin nature makes it not very good at resisting abrasion and puncture, which is much more likely to happen. Alternatively, harness tape was made to resist abrasion, resist reasonably high temperature (150c)… Idk, can someone point out why kapton tape is useful in battery building insulation?

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I don’t need it anyway. Fishpaper goes there or fiber plates.

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I’m gonna go with a solid no on kapton tape. Nothing on it’s spec sheet makes it useful for our relatively low DC voltage battery packs with high vibration requirements. Other than the fact that it’s transparent and looks cool(ish)?

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I’m thinking about putting my bms outside of the heatshrink.

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Kapton is definitely handy while working with the battery to prevent shorts.

I’ve created shorts through masking tape before… unexpected and fun :joy:

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Do it. It will allow you to easily replace if need be and check on the cell voltages through the pinout :+1:

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Duck tape wohoo

I can see it as a useful build tool for temporary masking, but it makes no sense used as permanent insulation. Almost anything else is better. Heat shrink, fish paper, cloth tape, cut up paper cups, strips of old tshirts. :joy:

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