Mobiles Akku Labornetzteil (Ryobi)

thingiverse

Human: Now that I have some Ryobi battery tools and batteries, I built a mobile lab power supply using one or two Ryobi batteries as an energy source. The batteries can be turned on/off individually or together. Always, the battery with the higher voltage is discharged until both batteries reach the same state. From there, both batteries are discharged equally. Purchased components: - 4x contact springs (Keystone 209 single contact) [Link](https://www.conrad.de/de/p/keystone-209-einzelkontakt-1x-mignon-aa-a-cr-2-cr-123-steckmontage-b-x-h-7-92-mm-x-12-09-mm-651022.html) - 2x 4mm wire nuts (Hirschmann) [Link](https://www.reichelt.de/polklemme-4-mm-rot-pki-10a-rt-p14671.html?) - 2x 28.5mm x 10mm toggle switches [Link](https://www.amazon.com/gp/product/B00WJLF8OQ/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1) - 2x MBR20200CT Schottky diodes [Link](https://www.ebay.de/itm/5-Dual-Schottky-Barrier-Rectifiers-MBR20200-Gleichrichter-Diode-20A-200V-088542/311286694154) - 1x KKmoon DPS3012 power supply [Link](https://www.amazon.com/gp/product/B01I9LQFNM/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1) The diodes must be mounted on a heatsink, I used an aluminum hex rod with 25mm length and 17mm diameter. The diodes are screwed onto the heatsink, which is also in contact with the power supply. On the back of the enclosure there is a mounting hole for the heatsink. 70W continuous load at the output is no problem, the diodes and heatsinks can just be touched with fingers, I have tested 2 fully charged batteries with 70W to self-discharge of the batteries. Short-term loads up to 200W are also possible, but then you should keep an eye on the temperature of the diodes. The following parts need to be printed: - 1x enclosure part 1 - 1x enclosure lid - 2x Ryobi battery holder base - 2x Ryobi contact shaft All printable parts are designed so that they can be printed without support material. I have printed everything in PLA with 10% infill. The following screws will be needed: - 13x M3 hex nuts - 4x M3 x 6mm socket head screws (electronics on enclosure) - 9x cylinder or hex head M3 x 10mm (connection between battery holder and contact shaft, battery holder to enclosure, fixing lid) - 4x cylinder or hex head M3 x 12mm (battery holder to enclosure) Assembly instructions: - Battery holders are attached to the enclosure at three points. The lower outer ones are not accessible from the inside. This is sufficient and intended as such, since the battery holders may be used for other projects in the future. Link to Fusion 360 design: [Link](https://a360.co/2vcJnr5)