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BQ78350-R1A: Can it achieve < 5% accuracy for 11 cell LiFePO4 batteries ?

PYTsai
Genius 9285 points
Part Number: BQ78350-R1A
Other Parts Discussed in Thread: BQ78350-R1

Hi 

Can it achieve < 5% accuracy for 11 cell LiFePO4 batteries ?

May i have an rough idea what accuracy can BQ78350-R1A achieve for 11 cell LiFePO4 batteries ? 

Thanks!

  • 0
    TI__Guru* 77263 points

    Hi PY,

    Yes, this should be possible. The biggest challenge with LiFePO4 battery chemistry is that the discharge curve is very flat. However, the BQ78350-R1A uses the CEDV gauging algorithm which uses coulomb counting to track the charge in and out of the battery. The important thing is to go through the CEDV parameter optimization process in the Using the BQ78350-R1 application report (see the Gas Gauging section): https://www.ti.com/lit/an/slua924/slua924.pdf 

    Best regards,

    Matt