Hi,
I am currently working with the BQ78350 and the BQ76920 to manage a 3-cell Li-Po battery. We are still in the process of understanding all the feature and intricacies of the devices.
My question concerns the cell balancing algorithm.
I have read the TRM and it says that cell balancing occurs only when a charging current is detected. But what happens if the cells haven't finished balancing when the BQ78350 has detected an end of charge?
We made a first discharge/charge test (only 1 cycle) and we found an imbalance of over 200mV after a full charge, and we were surprised that the gas gauge did not continue to balance the cells even though there was a clear imbalance.
Here are some of the setings:
Cell balancing threshold 3900mV
Cell balance window: 100mV
Cell balance minimum 40mV
Cell balance time: 20s