Battery Box with Spade Terminals

prusaprinters

<p>This is a battery box that uses piggyback spade terminals for the outputs. The default dimensions are for four 26650 LiFePO4 cells, a BMS and a bit of padding.</p><p>The connectors I used are called “piggyback connectors”. They friction fit pretty tightly into the holders on the underside of the top. Adding a little hot glue wouldn't hurt.</p><p>Use super glue or epoxy to keep the top shut.</p><p>I've included the FreeCAD file to customize. See below for parameters.</p><h5>&nbsp;</h5><h4><strong>Spreadsheet Parameters</strong></h4><p>All dimensions are in millimeters.</p><p><strong>Battery Width:</strong> Width of the inside of the box.</p><p><strong>Battery Depth:</strong> Depth of the inside of the box.</p><p><strong>Battery Height: </strong>Height of the inside of the box.</p><p><strong>Top Gap: </strong>Height of the inside of the top. I found leaving a 10mm “gap” between the top and the top of the battery gave me room to add a piece of foam to support the battery.</p><p>**Also, make sure to leave at least a gap that is your <strong>Terminal Height </strong>+ 3mm above your battery, whether you use this parameter or account for it in your <strong>Battery Height</strong>.</p><p><strong>Terminal Width:</strong> Width of the widest part of the piggyback connector. (In my case it was the female terminal.</p><p><strong>Terminal Length:</strong> Length of the female terminal on the piggyback connector, not including the crimp barrel - just the part that holds a male terminal.</p><p><strong>Terminal Height:</strong> Thickness of the female terminal on the piggyback connector.</p><p><strong>Terminal Thickness: </strong>Thickness of the male spade terminal on the piggyback connector.</p><p><strong>Terminal Spacing: </strong>Distance between the terminals on the finished battery.</p>