A powerbank with USB-C Power Delivery and 4S 18650 charger / BMS

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For some time now I have been looking for an open source USB-C Powerbank. I didn't find it so I started my first project.

Preliminary characteristics:

  • 1 quality USB-C connector
  • USB Power Delivery 3.0 dual role
    • Certified integrated solution
    • Source, 5 to 20V, max 45W
    • Sink, 5 to 20V
  • Li-ion charger
    • Buck / Boost
    • Programmable
    • Rated charging current, 1.5A
    • For 4 cells (4S)
  • BMS
    • Programmable
    • Smart fuel gauge (battery health)
    • All protections (Under Over Temp, Under Over Voltage, Short-Circuit)
    • Cell balancing
  • Management by microcontroller
    • Low power
    • I2C / SMBus hardware
    • Maybe integrated into the Power Delivery Controller
  • Possibility to use the battery voltage (Vbatt) to power external projects.
  • 4x quality 18650 cells

Preliminary synoptic:

I will be happy to discuss this project with you!

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[this comment has been deleted]

Antonin wrote 11/30/2020 at 20:42 point

Hi Kosma. I am not a battery specialist but integrated cell balancing circuits can only handle small differences.

Maybe you can create a battery pack with the old cells and a pack with the new ones and create an automatic battery selector.

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