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BQ20Z70-V160: Extend the life of using the battery pack

Masashi Mineda
Expert 1275 points
Part Number: BQ20Z70-V160


Hi,

We have some questions about BQ20Z75DBTR-V180.

For battery packs that are already in mass production, we are considering using the battery pack's SOC 75% as a full charge in order to extend the usage period.
(The microcontroller will remain set to be used as SOC 100% as before.)

Question 1
If I continue to use it with a 75% charge, will the learning cycle occur normally?
(Is there a possibility that there will be a jump in the remaining capacity?)

Question 2
If the learning cycle is not performed normally and the remaining capacity varies (an error of several percent or more occurs), is it possible to improve the error in the remaining capacity by periodically charging the battery to SOC 100%?
If it can be improved, I would like to know how often.

Question 3
I understand that during the learning cycle, I need to charge 100% to update the FCC regularly. Is it necessary to charge the battery to 100% when updating the FCC?

Regards,

MM

  • +1
    TI__Guru** 105810 points

    Hello MM,

    The learning cycle during initial setup of the gauge is always the full range according to the battery manufacturer, not a reduced range. If you mean Qmax update in the field then changing the charge to 75% SOC shouldn't impact Qmax updates.

    I'm not sure if you are using 75% capacity as reported by the gauge, or you are planning to change the configuration of the gauge so that 75% of the battery full capacity reports as 100% for the gauge, but the charge termination parameters in the gauge should be updated to reflect the change in where charge termination occurs.

    Charging to 100% is not needed during normal operation of impedance track gauges, they are constantly updating FCC.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Expert 1275 points

    Hi Wyatt,

    We understood that it is difficult to convert a 75% battery to 100% when using it.

    Regards,

    MM