• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 64 subscribers
  • Views 341 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.

BQ34210-Q1: Rarely Discharged Batteries

PAN-M
Mastermind 8375 points
Part Number: BQ34210-Q1

Dear team,

The systems of our customer usually discharge about 10mA.
It is written to the datasheet with "for Rarely Discharged Batteries", does even such a system not have any problem?

My customer uses LiFePO4.
Is this gas gauge usable by any application?

Regards,
PAN-M

  • 0
    Expert 2030 points

    Hello,

    Bq34210-Q1 is a CEDV method and calculates the remaining amount based on the amount of current input and output.
    Is it okay to understand that the method of measuring voltage and current when not charged and discharged is just for batteries that rarely discharge?

    Regards,

    Kagawa

  • +1 in reply to Yoshinobu Kagawa
    TI__Guru 61006 points

    I don't think I understand the question completely.

    This gauge uses CEDV so it relies on accurate FCC (configured and learned) and coulomb count (current measurement) to calculate state of charge.

    If you rarely discharge the battery, all that means is that FCC won't update so SOC may be inaccurate, if FCC becomes inaccurate over a long time as the battery ages.

    This gauge has an End Of Service feature for rarely discharged applications, in addition to CEDV (which is about gauging, not end of service detection, so these are two different concepts).

    EOS for rarely discharged applications works with short, shallow discharges with a defined current, which will not change the state of charge much but which are intended to measure cell resistance and how this changes over time as the cell ages. Hence it's possible to determine, through these short discharges, when its time to replace the cell with a new one.