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System side vs pack side fuel gauge

Eesu
Prodigy 205 points

Other Parts Discussed in Thread: BQ34Z100-G1

We want to have user-replaceable 2S LiPo battery for our device. While reading the article and SLUA638, it was not clear to me why it says "For applications where you want to give consumers the ability to swap battery packs but still want to provide high-accuracy gauging information, consider system-side gauges.". Could you please explain a bit?

Thank you.

  • 0
    TI__Guru* 76230 points
    Hi Eesu,
    System side gauges have measures in place to limit the inaccuracy of SOC which arises from swapping out a battery. For system side gauges, when inserting the battery, it has to be in a well relaxed state for the gauge to take an open circuit voltage (OCV) reading to be able estimate what the initial SOC is. Then for accuracy to be ensured, you have to discharge to empty or charge to full for the gauge to have a proper reference point. You IT gauges, you will further need a qmax and resistance updates to occur to have even better accuracy. But these require several cycles with rest periods included to have occurred

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 205 points
    Is it recommended so for single cell only or also for the multi-cell? Because our application has 2S battery pack. If so, could you recommend system side fuel gauge for this 2S battery pack?
  • 0 in reply to Eesu
    TI__Guru* 76230 points
    The bq34z100-G1 would be your best option for a system side gauge supporting 2s. It is recommended for multicell applications to always use a pack side gauge.

    thanks
    Onyx