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CCS/BQ27750: Code Composer Studio™ forum

Chris Chu
Prodigy 50 points

Part Number: BQ27750

Tool/software: Code Composer Studio

Hi TI team

I am using the IC for the BQ27750, and I have a problem with the calculation of the low temperature capacity of the battery.

ChemID has no low temperature. We tried to calculate a gg file by means of GPC RB. After the application, a condition occurs. The FCC is at -7 °C and is lowered from 2900 mAh to 100 mAh. This is the battery capacity. Unreasonable, I would like to ask if there is any solution to this problem.

Thank you!!

  • 0
    TI__Guru* 76230 points
    hi Chris

    Your question is vague. Did you run the gpcrb tool and then program the results sent back on the gauge? Did you program the temp k and temp a ( trise and t time constant) which the tool returned on the gauge? Did you perform a learning cycle after you performed the rbtweak and programmed the values on the device?

    You need to do the following.
    -Program the chemdat file returned by the tool on the gauge.
    -program the trise and ttime constant in temp a and temp k values.
    -Perform a learning cycle.
    -Then do cold temp test to verify it works


    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 50 points
    hi Onyx :

    Our battery pack capacity is 3100mah.
    The demand is discharged at -17 degrees c.
    So we did gpc rb table .
    Also got the gpc rb table parameter .

    We programmed srec to bq27750
    As a result, when the battery is at -7 degrees C,
    FCC jumped from 2920mah to 100mah
    To cause a short discharge time, the RSOC immediately jumps to 0%.

    We have followed the steps to get GPC RB,
    However, the capacity is still not accurate at low temperatures.
    What is the problem?

    Chris
  • 0 in reply to Chris Chu
    TI__Guru* 76230 points
    Hi Chris
    After you get the gpcrb values.
    Did you program the trise and ttime constant? did you redo your learning? like i mentioned above?

    thanks
    Onyx