• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 198 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ27426: Battery Gauge of different qualities

RJ
Intellectual 2550 points
Part Number: BQ27426

Hi Team,

I had a few questions on our battery gauge devices with Impedance track tech. Overall, working with 18650 single cell batteries that can be from various MFR. The user can receive the unit with one type of 18650 battery, but place a different quality/MFR battery in with different capacity. Being it is pre-programmed with chemistry profiles how would a use case like this affect the end design/gauging? Will it auto calibrate with the impedance tracking algorithm?

Regards,

Ramon

  • 0
    TI__Guru** 105740 points

    Hello Ramon,

    The gauge works best using the same battery from the same manufacturer, if the battery has different characteristics like internal impedance and OCV the gauging could be compromised. Some of the gauges can be loaded with 2 profiles and switch between them. If you are also inserting a different design capacity battery without updating the gauge to match the change it will not be able to track SOC or other parameters because they are based on the Qmax and design capacity.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Intellectual 2550 points

    Wyatt,

    This is what I thought, thank you for confirming. There would be no way around this other than to make sure the correct battery is used at all times correct?

    Regards,

    Ramon

  • 0 in reply to RJ
    TI__Guru** 105740 points

    Hello Ramon,

    Yes that is correct, the gauges need to know which battery is inserted to gauge the battery accurately. I believe the gauge you linked to though uses a predefined chemistry ID, which is made to match most batteries within a certain voltage. The design capacity must match the battery, but it should provide good estimations if the battery voltages are similar and the design capacity is the same between batteries.

    Sincerely,

    Wyatt Keller