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BQ4050: SOC after shutdown

HW_engineer_5678
Prodigy 75 points
Part Number: BQ4050

Hi I'm working with this BMS based on bq4050 and I have problems with the State Of Charge. When I wake up the battery after sending it to Shutdown to reduce the discharge the Relative State of Charge has changed. Could be that the BMS needs a cycle of charge and discharge to recalculate it? Does the BMS disconnect the DSG FET if the SOC is so low or does it just check the cell voltage?
Thanks

  • 0
    TI__Mastermind 27321 points

    Hello Bangalii,

    The device goes through a full reset when exiting from SHUTDOWN mode. 

    The CEDV algorithm mathematically models cell voltage (open-circuit voltage, OCV) as a function of battery state-of-charge (SOC), temperature, and current. The OCV voltage after the gauge exits shutdown might be off, leading to SOC jumps. It might require a charge/discharge cycle.

    SOC is based on voltage. The gauge will use its CUV protection which will check for Min cell voltage ≤ CUV:Threshold. Once CUV conditions are met, it will turn-OFF the DSG FET. More details in Section 2.2 Cell Undervoltage Protection of the TRM

    Regards,
    Jose Couso