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BQ28Z610: Low temperature discharge, SOC recovery issue after room temperature

Elias Xiao
Prodigy 240 points
Part Number: BQ28Z610

Hello Team，

At  -10 ℃, we discharge the battery to SOC=0%, and after the battery temperature returns to room temperature, we hope that SOC can recover (rebound).
We closed the SOC_ HOLD and Lock 0,  turned on Relax_Jump_OK, SOC has not been restored. Attached is GG.CSV. Can you help me review it? Thank you.

1145.gg.csv

  • 0
    TI__Mastermind 27321 points

    Hello Elias,

    RSOC will change if there's an increase in voltage and after an OCV measurement has been taken. Are you seeing the cell voltages increase? Has a valid OCV reading taken? Does RSOC change when you charge the cell?

    Please share your log file.

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 240 points

    Hello  Jose

    Yes, I can see the cell voltages increase and the SOC can rise normally during charging.


    The attached log is for your reference. Thank you.

    6.log

  • 0 in reply to Elias Xiao
    TI__Mastermind 27321 points

    Hello Elias,

    Looking at the configuration file again, I have a few questions:

    1- The terminal voltage (3450 mV) does not go along with the following (see below). This can cause gauging issues. I would set one to 3450 MV and the other one to 3550 mV.

    FD Set Voltage Threshold 3000 mV
    FD Clear Voltage Threshold 3100 mV

    2- Design voltage is set to 3800 mV, but then the cell voltage charges up to 4319 mV. What is the design voltage?

    3- Taper current might be too high. Please see below for recommended taper current.



    4- Did you obtain a matching Chemistry cell and did the learning cycle? I suggest to follow this start-guide for learning cycles if haven't done so. Key gauging parameters are explained in Section 3 Data Flash Configuration Settings Pertinent to Learning Cycle Completion

    Regards,
    Jose Couso