Hi!
Currently, I'm using the BQ76940 for my BMS 30S but it isn't enough efficiency so now I'm looking for an active balancing solution.
What I want:

1. Digital interface
2. Cheap))

In the worst case, I will use BQ76940 + active balancer IC for every cell.

Could you recommend me some IC?
Thanks

 

I bookmarked this a while back; cost was about $3 per bank.
http://www.afdhalatifftan.com/2017/06/low-cost-active-battery-balancer.html
No smarts, though.

There's this DIY BMS, but doesn't have active balancing as far as I can tell:
https://github.com/stuartpittaway/diyBMSv4
Maybe it's not too hard to adapt to active balancing?

My hands-on experience with active balancing is limited to buying (but not yet using) a board marked "Active Battery Cell Balancing" JW-5C1.2A. (5C for up to 5 cells (banks), 1.2A for 1.2 amps balancing current.) Like this one:
https://www.beyondlogic.org/review-...ive-equalizer-balancer-energy-transfer-board/
which reveals that the chip is an ETA3000
Data sheet here:
https://web.archive.org/web/2020013...n.com/upload/201905/09/201905091810050738.pdf