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BQ76952: Using two 7s in series for a 14s configuration

Taru Kapoor
Genius 11645 points
Part Number: BQ76952

Hi Team,

If the BQ76952 is to be used in a 14s configuration – can it be used with 2x 7s batteries in series? What are the things to consider here and will there be any issues in this implementation?

Regards,

Taru

  • 0
    TI__Guru 54715 points

    Hi Taru,

    It is an interesting question for your system design.  Since the 7s batteries are in series the voltages would be consistent with the capability of the BQ76952.  The BQ76952 is designed for random cell connection so each input except VC0 can take an 85V differential voltage.  VC0 should likely be connected to the battery- on the board.  See 16.3 Random Cell Connection Support in the data sheet.  If your batteries are assembled into a 14S battery as an assembly step there would not seem to be an issue.  If the 7S batteries are user configurable and reversible, or with a large capacitance load as noted in the data sheet where the abs max could be violated for a sustained time it may not be a workable design. 

  • 0 in reply to WM5295
    Intellectual 260 points

    Hi

    The question here is when two battery modules having 7S configuration are connected in series, there will be always voltage drop in the series connection bus bar from 7th cell of Ist Module to 1st cell of 2nd Module. How to compensate this voltage drop in BQ76952?

     

  • 0 in reply to Sandeep Kumar3
    TI__Guru 54715 points

    Hi Sandeep,

    The part could be configured to measure one 7S cell set as cells 1-7, the interconnect as cell 8, the second 7S cell set as cells 9-15. See the BQ76952 data sheet 10.1.2 Usage of VC Pins for Cells Versus Interconnect and appropriate sections of the technical reference manual. There is a limit on the voltage drop allowed on a bus bar, if the drop is greater perhaps you could monitor 2 sections of it with 2 cells.