Modular Battery Cell Test Fixture

thingiverse

This highly adaptable modular battery cell test fixture employs Lego, enabling thorough testing of cells with varying sizes and shapes featuring tabbed tabs. The Cell connection relies on a Kelvin Clip (“BU-75K” or “502001”) and a custom printed Lego Holder.The equipment interface utilizes a standard PCB header (OSTOQ035351) and a custom printed Lego holder. Note: When integrating this fixture with temperature chambers, verify that the printed material specifications comply. There are four versions of the Kelvin_Clip Lego Block due to discrepancies in fit when printing on different printers. The standard 1.5mm Lego wall proved too narrow, necessitating an increase into the post for a snugger fit. The 1.7mm wall (0.2mm into the post) appears to work well with Markforged. Purchase Parts Required: 1) KELVIN CLIP BU-75K https://ca.mouser.com/ProductDetail/835-502001?r=835-502001 2) PCB Header OSTOQ035351 (Mating connector is OSTTJ045153 ) https://www.digikey.com/product-detail/en/on-shore-technology-inc/OSTOQ045351/ED2702-ND/2351778 Considerations: For 18650 Cells and other cylindrical cells, substitute the ZKE Tech holders with the same PCB Header OSTOQ035351. https://www.ebay.ca/itm/5A-Four-Wire-Battery-Pack-Test-Stand-Holder-8-Position-for-26650-18650-AA-AAA/282734352730?hash=item41d447d95a