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BQ27Z561-R2: bq27z561-R2 NewBattery() equivalent?

craig
Intellectual 510 points
Part Number: BQ27Z561-R2
Other Parts Discussed in Thread: BQ35100, BQ27Z561, BQSTUDIO

Tool/software:

Primary cell gauges like the bq35100 have a newbattery() command to reset discharge and the like.

Anything equivalent for the bq27z561?

  • 0
    TI__Intellectual 2020 points

    Hello Craig,

    Is this for primary cells? If not, you wouldn't have to use a newbattery() or an equivalent command. This function is only for primary cell gauges which lets it know that a new battery is being used and to prepare for EoS and resistance updates for said new cell.

    For an Impedence Tracking gauge like the 27z561, you could just replace the battery if it's the same chemistry ID, or you could program a new chemistry ID.

    Regards,

    Siddharth

  • 0 in reply to Siddharth Venkatesan
    Intellectual 510 points

    Say I discharge a pack down and replace it with a full charge pack (gauge does not monitor a charge process). Is the gauge smart enough too accurately gauge this new pack?




  • 0 in reply to craig
    TI__Intellectual 2020 points

    You would have to reprogram the gauge with the golden image, the gauge wouldn't immediately recognize the characteristics of the new battery. However, the 27z561 is a pack-side gauge, so all the data in the gauge corresponds to a pack. If you will be swapping new batteries, we recommend using a system side gauge.

  • 0 in reply to Siddharth Venkatesan
    Intellectual 510 points

    When I say new battery, I mean 'fresh battery, fully charged, not the  'same battery' I was using before BUT THE SAME TYPE AND CONFIGURATION AS BEFORE.


    Here's how I planned to use it. 

    1)Create a learned image from bq27z561 evm, bqstudio and our custom pack configuration.

    2)Upload that learned image to all our devices...

    Will this still work?

    Based off the additional information you provided...IF I swap out a battery pack for a fresh one (say it has aged, and I want a fresh pack) I would have to re-upload the golden image? That doesn't seem right. 

    How should I handle swapping batteries (again they will be the same type and configuration)

  • 0 in reply to craig
    TI__Intellectual 2020 points

    Hello Craig,

    Pack-side gauges are usually "married" to a battery and updates Ra tables according to previous charge and discharge cycles. You could still replace the previous battery with a new battery of the same configuration and type, but the Ra table updates would be inaccurate for multiple cycles before it finally starts gauging the new pack accurately. The other way of doing this is to reprogram the golden image again, this could be done with the help of a microcontroller.

    Regards,

    Siddharth