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BQ27426: What is difference between State of charge and True state of charge?

KD NOH97
Prodigy 60 points
Part Number: BQ27426
Other Parts Discussed in Thread: BQSTUDIO

Hi TI team~

I have tested TI gauge IC using bqstudio and I have question.

What is difference between State of charge and True state of charge?

Sometimes, SOC value is different with True state of charge.

  • 0
    TI__Guru* 76230 points
    Hi KD,
    If you have smoothing functionality enabled, the SOC reported would be the filtered SOC. If Smoothing is disabled, the SOC reported would be the true SOC. Smoothing functionality is applied to prevent the gauge from reporting SOC jumps due to changes in the battery capacity due to changes in the battery temperature.

    I hope this helps.

    thanks
    Onyx
  • 0
    TI__Mastermind 34775 points
    Hi KD,

    True SOC is the raw SOC data, which can have jumps positive and negative direction during discharge or charge (for developers). SOC is filtered to minimize jump with smoothing and can be restricted to only decreasing or constant values during discharge and only increasing or constant values during charge (for system end users).

    It's recommended to use filtered SOC for making system decisions or displaying to end users.
  • 0 in reply to Damian Lewis
    Prodigy 60 points

    Thank you~

    But I don't understand why there is so much gab between SOC and True SOC. Because of filter?

    Could you explain for me?

  • 0 in reply to KD NOH97
    TI__Guru* 76230 points
    Hi
    The jumps in the true SOC must have been likely due to temp change as well as the current change. the Smoothing algorithm will prevent the end user from seeing these jumps.