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BQ78350-R1: Characterizing 14S14P battery pack

Eddie Koh
Genius 10505 points
Part Number: BQ78350-R1

Customer designed BQ78350-R1 with a 14S14P for personal mobility device, and need to characterize it.

What temperature and discharge current setting to be used when logging the 6 discharge data for the gauging coefficients? 

There is a need for 3 different temperatures and 2 different discharge rates:

- Temperature: Is it best to use ambient temperatures closest to the actual usage of the mobility device or use the highest, lowest and room temperature?

- Current: Load current surges & varies significantly. It is not a constant current usage scenario.  How can we correctly choose the discharge current to be used to make the coefficients as accurate as possible?

 

Can you suggest best possible way to make the BQ78350-r1 as accurate as possible based on this application?

  • 0
    TI__Guru* 77283 points

    Hi Eddie,

    For temperature, I suggest using high, low, and room temperature. This will help the tool comprehend the total range when calculating the coefficients. For current load, I suggest choosing an average current case and a higher current load. 

    After you have generated and updated the CEDV coefficients in the gauge, I also suggest looking that certain parameters to determine the best setting for your application. Overload Current and the EDV Hold Times can be helpful to avoid big SOC jumps due to false EDV threshold detections due to pulsed loads. It may also be good to set the VFLT_EN bit in the CEDV Gauging Configuration register.

    Best regards,

    Matt