libresolar / bms-5s50-sc Goto Github PK

The flat flex cable has to be bent too much --> connector on the power PCB (Switch-N-Sense) should be moved more to the center of the PCB.

Current mounting holes: diameter 2.5 mm
Screws for Hammond Manufacturing 1591 require >2.8 mm --> take 3 mm

To try this out I tried to order the board from jlcpcb, but they didn't like it, for some reason they didn't elaborate on. I've now looked at the project in kicad and got numerous issues when I ran a DRC check on the layout. Perhaps it's due to my version of Kicad so I'll go and update that... No updated and still throwing up a lot of errors.

I'm currently building the control PCB of the BMS-5s and noticed that the SOD-323 footprints of D6, D8 and D13 are too small for 1N4148W diodes. According to the datasheet they should have a SOD-123 footprint. Diodes of the type 1N4148WS would fit the SOD-323 footprint, but they have a lower power dissipation and surge current rating.

The resistance should be 330R --> correct part number: RC2010JK-07330RL

Hi, I'm also doing similar work. Came upon your work. It's very well done. However, I wanted to know is there any special reason why you've picked high-side switching?
Regards, Orkhan.

PCHG MOSFET (Q5 in power PCB) has a wrong pinout. The schematic symbol should be Q_PMOS_GSD instead of Q_PMOS_GDS. This error causes the Pwr+ port to be permanently switched on via the PMOS and PCHG resistor path.

In addition to that, a pull-up resistor should be added.

The sense resistor inputs are interchanged. SRP should be connected to the cell side, SRN to the pack output side.

This issue causes a wrong sign in current measurement. In addition to that, the short circuit and overcurrent protection in the IC don't work anymore (they only work in discharge direction).