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JEITA Guidelines for LiFePO4 Batteries

Steve Hinshaw
Intellectual 515 points
Other Parts Discussed in Thread: BQ24630, BQ34Z100

I've seen a number of articles about JEITA recommended charging profiles for Li-Ion and Li-Polymer batteries, but can't find much information as to whether there are similar recommendations for LiFePO4 batteries. If there are equivalent recommendations for LiFePO4 batteries, I'd appreciate you input.

What's the recommended TI charger for a 4-6 cell (number of cells required not finalized in the design yet) for LiFePO4 battery packs? I've been looking at the bq24630 but would appreciate any other recommendations. The bq24630 limits charging current at low and high temps... is this based upon a JEITA recommendation?

I'll be using the charger in conjunction with a bq34z100 gauge gas that I'm currently evaluating.

Thanks in advance for your inputs.

  • 0
    TI__Guru 57681 points

    BQ24630 does not support JEITA.

    Thanks.

  • 0 in reply to Ning T
    TI__Guru**** 166696 points

    From our in-house battery expert:

    "normally JEITA is not chemistry specific or cell type specific, but just indicates that there should be “a voltage threshold” or “a temperature threshold”. This allows cell manufacturers to set particular voltage and temperature thresholds dependent on chemistry. So you are looking not at JEITA for LiFePO4, but at “JEITA thresholds” recommended for LiFePO4 by a particular cell manufacturers.

     I have never seen such recommended levels, probably because JEITA is not a large focus for LiFePO4 as this chemistry already has increased safety and longevity"

    In short, ask your battery supplier for the recommend thresholds.