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BQ40Z50: BQ40Z50-R3 FCC decline

jang hwigyeong
Prodigy 50 points
Part Number: BQ40Z50

Tool/software:

Hello.

After uploading the learned golden file for the BQ40Z50 battery, the FCC capacity decreased from 6,100 mAh to 5,300 mAh after the first charge-discharge cycle (charge-discharge-charge).

Please check if there is a problem with the learned golden file or if there is another issue.

I've attached the data and gg file from the link.

- The BQ40Z50-R3 chip was used, and the battery cell is INR18650-35E.

FCC-Error_250917.xlsx

250819_Golden.gg.csv

  • 0
    TI__Mastermind 27405 points

    Hello,

    This question has been assigned and will be reviewed when possible, in the meantime please attach associated files such as .gg/.log/.srec.

    Thank you,
    Alan

  • 0
    Prodigy 50 points

    I have attached the log data from the time of the FCC drop in charge/discharge cycle and the gg file of the pack.

  • 0 in reply to jang hwigyeong
    TI__Intellectual 1562 points

    Hello Jang,

    Please check the following:

    By importance, we want to check the following parameters one by one:

    1. 1.Calibration of IVT
      1. 1.Calibration of the current readings
      2. 2.Calibration of the voltage readings (BAT, VC1, PACK)
      3. 3.Calibration of the temperature sensor
    2. 2.CHEMID (Catalogue/ Custom)
      1. 1.Used Tool?
      2. 2.Check initial Ra table values
    3. 3.Learning Cycle
    4. 4.Load Mode
    5. 5.Qmax Updates
      1. 1.Good OCV
      2. 2.Where is the jump?
      3. 3.What term voltage?
    6. 6.Ra Tables Updates
      1. 1.Are updates within a few 10 of mΩ?

    -Miguel

  • 0 in reply to Miguel Castro Gonzalez
    Prodigy 50 points

    Hello Miguel

    Thank you for your answer.

    I will answer your questions.

    1.Calibration of IVT
      1.Calibration of the current readings / complete
      2.Calibration of the voltage readings (BAT, VC1, PACK) / complete
      3.Calibration of the temperature sensor / complete
    2.CHEMID (Catalogue/ Custom)
      1.Used Tool? / Use Tool
      2.Check initial Ra table values / GG File attach
    3.Learning Cycle / complete
    4.Load Mode / Load mode 0,  Load select 7
    5.Qmax Updates
      1.Good OCV / what Good OCV?
      2.Where is the jump? / FCC drop occurs when switching from discharge to charge (6098mAh --> 5341mAh)
      3.What term voltage? / Term Voltage : 3000mV
    6.Ra Tables Updates
      1.Are updates within a few 10 of mΩ? / GG File attach