33140 Insulator Cap for LiFePO4 Copper Terminals
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Protects your LiFePO4 cell from short circuits while soldering/welding to the copper terminal
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Copper Terminal LiFePO4 33140 cells can be found somewhat cheaply online but they have very obvious issue for the DIYer - the copper bus on the positive terminal is <2mm tall and can easily be shorted against the cell body.
These caps are designed to fit around the thin insulation ring while keeping the vent unblocked. The result is that you can rest a bit easier while building your packs. Copper or Nickel strips can rest across the cap as you attach them to other cells. Printing them in the appropriate color also helps provide a visual cue to avoid shorts or incorrect assembly.
I advise using ASA or PCTG for this.
Swap the filament to whatever color you want though and feel free to paint the +/- in your favorite slicer to improve readability.
As for attaching the strips, a AWithZ p60f welder with special paste can weld a 0.1mm copper strip - 0.2mm thick will need a larger welder.
Soldering can be done as well but proceed at your own risk.
And as always, use at your own risk and verify polarity before installing - don't blame me if you burn down your house or your battery pack explodes.