Other Parts Discussed in Thread: BQ76200, BQ24725, BQ78350-R1, BQ4050, BQ76952, BQ78350, BQSTUDIO, , BQ41Z90
Tool/software:
Hello,
I have a few prototypes of a BMS designed 6 years ago with a BQ7692000 AFE, a BQ78350-R1 companion device, a BQ76200 to drive the hi-side mosfets and a BQ24725 charger. This first design is working very well.
The product will jump from prototype to production state. I would like to optimize the BMS. No particular cost limitation, but it would be nice to shrink the design to spare some cm² on the PCB.
The battery is based on 18650 Li-ion cells, 4s2p.
I need :
- A SMB bus responding to SBS command (need to retrieve battery voltage / current / rsoc and basic info from a linux host)
- A 2A smart charger
- Full protections with top-side mosfets
- External cell balancing
- ... and a design smaller than the actual
BQ4050 and BQ40Z50 seems to be the perfect devices to replace the trio (BQ7692000 + BQ78350-R1 + BQ76200). I will keep the BQ76952 charger. Does someone approve / disapprove this choice ?
I don't know if I need the Z version. BQ4050 gauge is based on CEDV, like my actual BQ78350. The gauge precision is good enough.
Pros for BQ4050 :
- Less expensive (but I'm not looking for a 2$ economy)
- Probably more easier to calibrate / setup ? (I'm not familiar with the impedance track algorithm)
Pros for BQ40Z50
- More precise (probably more than needed)
- Probably a little bit more easy to buy (my favorite distributor only stocks the Z version)
Feel free to comment
Thank you
