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BQ3050: FD Set and RSOC remains Zero

Part Number: BQ3050
Other Parts Discussed in Thread: BQEVSW

Hello Team,

I have Discharge My battery completely , Below CUV threshold ( Just to Test ( Cell Voltage = 2500mV) ). Before CUV threshold RSOC was showing regularly on charge, but after this discharge RSOC is not increasing above 0%. I tried to charge Cell Voltage = 3450mV. Still RSOC=0%. FD flag is set. Snap shot attached here with.

Can I use FD Clear Voltage TH instead of FD Clear % ? Any parameter Setting ? 

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  • Hello Bhupendra,

    The cell should be discharged down to EDV0. EDV0 will determine RSOC = 0%. 

    If cell keeps discharging to CUV, then the protection triggers. 





    but after this discharge RSOC is not increasing above 0%. I tried to charge Cell Voltage = 3450mV. Still RSOC=0%. FD flag is set. Snap shot attached here with.

    It seems like the gauge did not enter charge mode, for the gauge to enter charge mode, the average current has to be greater than the Chg Current Threshold. I would need to check the log file to further investigate this issue.

    Regards,
    Jose Couso

  • Here , I  am attaching Log File Generated by our software. Not sure if that helps.

    After Cell = 3450V , RSOC Start increase. Should it not  show More than 0% @  3450mV Cell V ?

    ChargeData.txt

  • Hello Bhupendra,

    What you provided does not look like a log file. 

    Here's an example of a log file.


    Also, please provide your configuration file. 

    Regards,
    Jose Couso

  • Yes, Jose 

    Log file we know , but since we are creating Logfile with our  proprietary software  , hence we don`t have BQEVSW log file at present.

    Parameters file .gg is Here.

    BQ3050EVM.zip

  • Hello Bhupendra,

    I looked into your gg file, and I see that fixed EDV0 is set to the same voltage level as CUV threshold. Mostly, fixed EDV0 will be configured a little bit higher than CUV threshold unless you want the FETs to turn OFF at 3160 mV.  System will get back into normal operation once one of the cell voltages is higher than the CUV recovery voltage. At this point check if TDA, FD, CUV, XDSG are reset, if those flags are not 0, please check at what voltage level it happens.

    So in your configurations I see:

    fixed EDV 0 = 3160 mV
    CUV threshold  = 3160 mV
    CUV Recovery  = 3250 mV

    I would try setting CUV threshold lower, and then discharge down to fixed EDV0 (to avoid protection from triggering). Then, charge again and see if RSOC makes more sense.  

    Regards,
    Jose Couso