Other Parts Discussed in Thread: BQ78350, BQSTUDIO
Hello we use the BQ78350-R1A in combination with the BQ7693000DBT in a 6S setup.
software used bq78350_R1_v1_04_build_26.srec
The system was working uptil now we have found a strange behavior and in my opinion not a good one.
During charging there was one cell not in balance to high normaly the balancing circuit will reduce this issue and the battery pack is in balance.
now the is one cell going in over voltage during charging and the SOV bit in BQstudio is going on. charging is not possible any more. now we start pulling current out of the battery un till the voltage is below the SOV and a certain treshold. at tha tpoint you would expect that the SOV will disapeare and that it should be possible to charge again. But the SOV stay active and the charge FET stay off . charging is not possible.
If we now look at the bottem side at SUV and try a silmilar test but at the low side then this meganism is working. we discharged the battery jus below the SUV level and the SUV bit turned on and discharge FET opend discharging stoped. The cell revoverd it self after a dome time and the level was above SUV and the threshold level for SUV. at that moment the SUV Bit turned of an discharge FET was active again. at the same time the SUV bit toggled to green in BQstudio also SOV bit toggled to green.this last behavior is strange only when cell is completly down the SOV alarm disapear. is there somting going wrong in the software of the BQ78350-R1A?
Kind regards
Rens