Hello,
We are designing a battery monitor/gas gauge for use with a 4S LiPo pack that can track, and report, cell voltage, current, impedance, SoC, temp, health, time to empty, and basically all the information we can get our hands on. We would like to have this monitor permanently installed inside a test craft, and used with multiple different LiPo packs, will this cause issues?
The BQ76920 paired with the BQ78350-R1 seems to be a popular combination. Is the BQ34110 also compatible with the BQ76920? If so, why is the BQ78350-R1 more commonly recommended?
We are also trying to determine if Impedance Track (IT) would be appropriate for our application. I understand that "there are certain application conditions that are not ideal [for Impedance Track]: highly pulsed loads and applications that do not allow rest periods." I am curious where this information is documented, and what defines a highly pulsed load, and what defines a rest period. Our test flights typically discharge the battery pack completely, would this mean there is no rest period?
If IT is suitable for our application, we would happily use an IT based gauge, including the BQ40Z80 or the BQ40Z50-R2 as stand alone solutions.
Are there big disadvantages to using a CEDV gauge? Would impedance measurements be more reliable with an IT based device?
I am spending my days wading through the technical documents and forums that Texas Instruments has, but would appreciate feedback on the above.
Thank you,
Joe