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BQ40Z50-R2: usage of SMOOTHING versus RSOC_HOLD

Sabrina Boeser
Prodigy 150 points
Part Number: BQ40Z50-R2

Hi,

during the development of our new battery pack with bq40z50-R2 we are not sure if the use of SMOOTHING is the correct thing for us and if you could maybe give us an estimation.

We've been using CEDV for our medical batteries before, this is the first time to use Impedance Track.

Most important for our application is accuracy and that within discharging especially, coming towards 0% there should not be any jump or so leading to sudden shutdown of the application when powered by battery. It is necessary that we have enough time while the battery becomes discharged during which alarms can be displayed that the battery is reaching empty state. Therefore, it is also absolutely necessary that the battery packs run accurately, with a correct value of SOC and runtime.

From our understanding, SMOOTHING works with mostly estimations and not the correct value.

It would be great to get any suggestion!

Thanks so much & Best Regards,

Sabrina

  • 0
    TI__Mastermind 24870 points

    Hello Sabrina,

    Smoothing algorithm tries to cover up middle of discharge or middle of charge jumps. It cannot prevent jumps to 100% and 0% which are the fixed points for a battery's capacity.

    The gas gauge reports both a true and a smooth value.

    The biggest change going from CEDV to IT would be EDV2, EDV1, EDV0 correction points. IT only corrects you at terminate voltage, which is equivalent to EDV0.