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Bq2060A Query

Aamir Ali
Expert 2525 points
Other Parts Discussed in Thread: BQ2060A

What is the purpose of below marked resistors & their value keeps on increasing from highest cell to lowest cell

  • 0
    TI__Genius 10235 points

    Those are used for cell balancing when using LION cells. The reason the values are different is because the voltage divider ratio for the top two cells is different than the bottom two cells, so different value resistors need to be used to get similar bypass currents.

  • 0 in reply to Chase7071949597
    Expert 2525 points

    Chase,

    Can you explain further how do they work & help in cell balancing? For one of application, we need gas gauging only for LI-ion Cells, so I am using Bq2060A for the same. I have got other functioning of IC but stuck at this point

  • 0 in reply to Aamir Ali
    TI__Genius 10235 points

    The resistors simply shunt current around the cell. It isn't much (10 or 20uA), but it can help lengthen the life of the battery pack. Basically, if there is an imbalance where one cell voltage is higher than another, that higher voltage cell will have a slightly higher bypass current than the lower voltage cell. This works best for packs that are already pretty well balanced since it obviously is not going to be able to correct a large imbalance.