18650 slide case / power supply

thingiverse

The lid of the box has two stages: - The first lock will give it a good hold but it is still easy to open it again if required. - The second lock (no more bulk line will be visible beneath the bottom line of the lid) will lock the box for good. It requires quite some force to push the lid on the box for the 2nd level, but this will fully airtight seal the box. At this position, it is nearly impossible to open the lid again. The lid includes two holes for wiring. They can be extended with a soldering iron or drill or closed with a soldering iron or some glue. If you get it right, they should be air-tight as well, if not add some glue. The + side of the box has an intentional breaking point included. The wall inside the guiding is extremely thin, however, this does not affect the overall structural integrity of the box. The intention of this is a pure safety feature. In case one or more batteries explode, the pressure should be able to break the wall and escape more or less controlled instead of converting the box into a bomb. I had luckily had no chance to test it yet, but it is there. Make sure to place your 18650s with the plus pole towards the marked plus side of the box with the breaking point, as the plus side of the batteries also includes the pressure valve. The holes in the mounting point are perfect for M3 screw threats. Whatever you do, be careful. I will include a BMS into my battery packs to give it additional protection.