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BQ28Z610: Chemistry ID selection

Alexey Bulatov
Prodigy 185 points
Part Number: BQ28Z610
Other Parts Discussed in Thread: BQ40Z50

Hello.

I've a 2s2p battery consist of 4x HTCF26650-3200mAh-3.2V LiFePo4. I also made battery charge/discharge/relax test and got a report from Chemical ID SelectionTool.

In the report I can't find ChemistryID of my cell (there are 2 or 3 chemistry with name HTCF26650 3200mAh). How could this happen?

And best chemical ID has DOD deviation ~8%. This max error looks too high. Is it normal to use such chemistry?

Thanks a lot.

  • 0
    TI__Mastermind 42535 points

    LFP is a very different cell type. It is not supported by the bq28z610. Please use the bq40z50 for LFP cells.

  • 0 in reply to Batt
    Prodigy 185 points

    The lithium iron phosphate battery (LiFePO4 battery) or LFP battery is a type of lithium-ion battery. And from the datasheet of bq28z610:

    The bq28z610 gas gauge is a primary protection device that can be used with a 1- to 2-series Li-Ion/LiPolymer battery pack.


    What is the difference?

    Anyway, gpc tool doesn't need device type for reporting ChemID. So is it normal that DOD error 8%? Can I use such chemistry further?

    Thanks.

  • 0 in reply to Alexey Bulatov
    TI__Mastermind 42535 points

    No, it's not. The Li polymer cells have higher voltages 4.2V or more for chg termination. LFP has a much lower voltage.

    You can't use that chemistry with this gauge. Please try the bq40z50.