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BQ40Z50: Delayed counting when charging from shutdown

Dan Ringger
Intellectual 1790 points
Part Number: BQ40Z50
Other Parts Discussed in Thread: EV2400, GPCCHEM

Hello - I am performing qualification testing on my BQ40Z50 board.  I did a learn cycle and that seemed to go good, but the FCC was a lot lower than the cell.  When I charge from shutdown the Remaining capacity does not start counting for 13 minutes or after 500 mAh was placed into the pack.  I have attached my log file for the run and my gg.csv file.  If you look at chart 2 in the XLSX file you will see where the Remaining capacity doesn’t start counting right away.  If you go to the data file you can see at Excel row 212 that the cell voltages are about 3.480’ish when counting starts. Can you help me determine what settings could be causing this.  FD, TD, etc.?  Thank you.Charge1 after learn.xlsxTI-SM218.gg.csv

  • 0
    TI__Guru* 76230 points

    Hi Dan

    It appears you may have discharged the cells below 12V which is your term voltage.  If you look at your true remaining capacity, it is showing -498mAh which is about you say was placed into the pack. You have negative remaining capacity if you discharge below term or if you discharge to close toempty at room and then place the cells in cold temp and continue discharging

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    TI__Intellectual 1790 points

    Thank you.  I reset my term voltage to 11000 mV. Did a reset, and started charging at 2.4 Amps.  The attached registers screen shot shows that the cell voltages are all above 3400, the DOD passed is -415, and remaining capacity is still 0, and FD is still set after over 10 minutes(state time = 616 sec.) of charging. 

     Do I need to do a new learn cycle, cycle pack a couple times, other setting changes needed, etc. etc. 

  • 0 in reply to Dan Ringger
    TI__Guru* 76230 points

    Hi Dan

    This is unrelated to your issue but you need to unpdate the firwmare on your ev2400 to version 0.18 or later.

    You can't just reset your term voltage to a lower value with the hopes that it corrects things. You may even be using a wrong chem id. Did you follow the process for identifying your chem id as explained in our online tool gpcchem?

    I suggest, you start from there, then redo your learning with the correct term voltage of 12V for your 4s pack.

    thanks

    Onyx