Other Parts Discussed in Thread: BQ77915
Greetings!
In the video linked below, At 3:15. There is an explanation concerning balance with voltage separation. It is said that cell balancing starts when at least one cell is below the Cell balancing Threshold Min (Vstart) and another cell is above the Cell balance Threshold(VCBT). It is also said that the cell balance stops when none of the cells is below Vstart. To continue the cell balancing one cell must exceed the new threshold (incremented by Cell threshold Min).
Why does one cell have to exceed the next cell balance threshold (4000 mV) to let the cell balancing continue? Why does it not even the cells voltage out among the cells until the difference between the cells is equal to the cell balance min?
Am I missing something here?
For a concrete example: The cell balance threshold is at 3900 mV, the cell balance window is 100 mV, cell balance min is 20 mV and a charge current of 50 mA.
If one cell is charged above the cell balance threshold (3900 mV) and the other cells are below Cell balancing Threshold Min (in this case 3900-100 mV) the balance will occur until the cells are above the Cell balancing Threshold Min then it stops. In my opinion, it should continue balancing until the difference between the cells is equal to the cell balance min (in this case 20 mV).
Best regards,
Michael.
