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TIDA-00792: BMS to charge 18 cells

Godwin Zhang
Prodigy 30 points
Part Number: TIDA-00792
Other Parts Discussed in Thread: BQ76930, BQ34Z100-G1, TIDA-010030, BQSTUDIO

Hi,

I need to design an BMS which can charge 18s3p cells with the functions of reporting the state of charge and passive balancing. I really like the TIDA-00792 TI Reference Design. It almost fits what I need. But it can only handle up to 15 cells. Is it possible to add another chip to handle the extra 3 cells?

I also looked at the TIDA-01537 Design, which is scalable from 6s to 96s cells. But it seems to me that it doesn't report the SOC. Is that right? Is it possible to add that function?

Any advice would be greatly appreciated

  • 0
    TI__Genius 10830 points

    Hi Godwin,
    Have you looked at the TIDA-01093? It is a reference design developed for a 20s application and uses 2 BQ76930 ICs, stacked.
    This particular reference design doesn't include the gauge though (for reporting the SOC). But you can look at the TIDA-010030#mce_temp_url# for inspiration on how to use a top of the stack gauge like BQ34Z100-G1.

  • 0 in reply to David Hien
    Prodigy 30 points
    Hi David,
    Thank you so much for the quick response! I am looking at both TIDA0193 and TIDA-010030 now.
    Godwin
  • 0 in reply to Godwin Zhang
    Prodigy 30 points

    Hi David,

    The reference designs, TIDA0193 and TIDA-010030 are very helpful! But I still have a dump question. Is it possible to get the list of the battery chemistry that BQ34Z100-G1 supports? Particularly, does it support NCA (Lithium Nickel Cobalt Aluminium Oxide LiNiCoAlO2)? I could not find it from the datasheet.

    Thanks

    Godwin

  • 0 in reply to Godwin Zhang
    TI__Guru 54715 points

    Hi Godwin,

    Yes, the BQ34z100-G1 will support NCA cells.  If you load BQStudio without an adapter or device you can open the chemistry tab to see the list of supported chemistires and sort the various columns.  There are several NCA cells shown.   If you have an operating gauge or other method to log you can use the GPCchemtool to match your cells to a specific chemistry.