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BQ76930: BQ76930 for 5S2P applicarion

chiayuan li
Prodigy 190 points
Part Number: BQ76930
Other Parts Discussed in Thread: BQ78350-R1, BQ76920

Dear Ti experts,

I have a battery pack that is 5S2P 18650 structure, and i  am looking for sutiable BMS IC that can monitor and protect every single cell.

Is it possible to use BQ76930+BQ78350-R1 for this application? or other better suggestion solution for 5S2P 18650 application?

thanks.

  • 0
    TI__Genius 10830 points

    hi Chiayuan,
    thank you for your interest in our parts. You have a few options for a 5s2p battery. I am assuming you're  referring to a Li-Ion battery here.

    bq78350-R1 + bq76920 (5s monitor) is a better solution than bq78350-R1 + bq76930 (10s)

    Another more integrated solution would be the bq40z80, which is a gauge with integrated analog front end (gauge+monitor+protection) for up to 7s. It will RTM very soon!

  • 0 in reply to David Hien
    Prodigy 190 points

    Hi David,

    Thank you for your suggestion, i used to use BQ76920+BQ7350-R1 for 5S1P 18650 application.

     According to your BQ76920+BQ78350-R1 suggestion, and i check BQ76920 datasheet that BQ76920 support to 5-series cells.

    If i use BQ76920 for 5S2P application, the placement will be as blow

    Do it work for BQ76920 monitor and cell balance function?

    By the way, how about the cell map set up in BQ78350-R1 GUI?

    Is it the same as 5S1P set up?

    Finally, Will the cell voltage monitor result be the same as 5S1P result?

    The GUI will only display voltage of 5 cells, is it correct?

    thanks. 

  • 0 in reply to chiayuan li
    TI__Guru* 81034 points
    Hi Chiayuan,

    The setup will be the same for a 5S2P configuration. Each pair of cells in series is treated as one block, so it will look the same to the monitor and gauge. When you set up the gauge, be sure to update the design capacity since this configuration will double the capacity, but all voltages will stay the same and cell balancing will still work.

    Best regards,
    Matt