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BQ76952: Stacking, Cells per Chip

Robert Andris
Intellectual 415 points
Part Number: BQ76952

Hello,

we are currently in development of a 22S Battery with Stacked bq76952. Since there is no Recommendation about how we should divide the cells on the 2 Chips 

i want to ask if we should do Full 16 Cells on the "lower" bq76952 and 6 on the upper one or do 11 Cells per Chip to keep the "virtual" Ground in the middle low ?

thanks in advance

Robert

  • 0
    TI__Guru* 79913 points

    Hi Robert,

    Normally, I have seen other users divide the cells equally on the 2 monitors.

    One challenge with stacking is that each battery monitor can only do cell balancing within the group of cells it is connected to. So the top monitor can balance the top cells to each other and the bottom monitor can balance the bottom cells. I have seen some users add a way to drain the top group or bottom group for the case where the microcontroller needs to balance the groups. For example a circuit can be enabled to pull current from REG2 of the bottom device if the bottom group is higher than the top group and another circuit can be enabled to pull current from REG2 of the top device if the opposite is true.

    Best regards,

    Matt