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BQ78PL116: BQ78PL116RGZT

Shailender kumar
Prodigy 80 points
Part Number: BQ78PL116

HI

Subject: Problem in number of parallel cell count.

i successfully  operate the bq78pl116 with pack 14s8P.  But when i increased the number of parallel cells more than 8P then an error is shown "0 cell count" and message is shown LAN is not build and "expected number of cells not equal to the number of cells connected to the hardware". bq78pl116 IC  heat up at that time. Is there any problem related to sense resistor or something else. Please if you have solution guide me. I want to connect 14S40P pack. My cell voltage range 2.9V to 4.2V and 2600mAh.

Thanks

  • 0
    TI__Genius 10830 points
    Hi,
    Thank you for your post. We will look at your question during the coming work week.

    Regards,
    David
  • 0 in reply to David Hien
    TI__Guru 54715 points
    Hi Chetan,
    The bq78PL116 basically does not care how many cells are connected, all parallel cells with be the same voltage. There will be data ranges to consider of course. There are 2 typical reasons to parallel the cells, 1 for more current, the other for more capacity. To obtain the higher current you will need to design your interconnect carefully to allow the current to flow from the cells to the load. Resistance in the path will limit the current. You may need to change the sense resistor smaller to stay within the dynamic range of the bq78PL116. Of course as the resistor gets smaller the current which it can resolve will decrease. When designing for more capacity the resistor may stay the same, but you may need to use any scaling features with the gauge to allow the data range to represent the capacity, or add your own scaling method.
    If the bq78PL116 is getting hot it is likely damaged.
    Connect your cells together, then connect to the board using the recommended power sequence.