Hi Guys,
Currently I am doing the learning cycle.
fuel gauge : bq40z50-r2
firmware version : 2.11
Battery pack : four 18650 battery pack in series with nominal voltage of 14.4v and capacity of 2200mAh
Design capacity in mAh : 2200 mAh
Design capacity in cWh : 3168 cWh
Design Voltage : 14.4 V
issue: pack's no load full capacity(QMax) not updated as TI suggested after the charging.
Detailed steps
- Continued the learning cycle process by discharging the battery to empty at 1C (discharging current - 2.2A)
- Then relaxed the battery for around 2.30 hours to allow fuel gauge to take the open-circuit voltage(OCV) for QMax update - this done properly by verifying the [VOK] and [RDIS] bits in the ITStatus Register and the GaugingStatus[REST] flag is set when a valid OCV reading occurs.
- Then charged the battery to full at 1C(2.2A const. current).At the start of charge, the [VOK] bit in the IT status ()
- After charging, I relaxed the battery for 2 hours.
- This relaxation time allows for a valid OCV reading to be taken and stored for the Qmax update, after the update the [VOK] bit in IT Status() register clears also the GaugingStatus[REST] flag is set when a valid OCV reading occurs- this also i verified. But when the QMax update occurs, LStatus() would change from 0x04 to 0x05 - i am not able to verify this condition.
What would be the possible reason for this, Can you guide us why we are getting this?
please find the attached learning cycle log file
Please find the data memory(gg.csv) log also.
18650_learningcycle_datamem_logs_RELAXING_AFTER_CHARGING.gg.csv
