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BQ34Z100-G1: Inaccurate state-of-charge at low temperatures

Aaron Lal
Prodigy 160 points
Part Number: BQ34Z100-G1

Hello TI,

I'm seeing unstable SOC readings at temperatures below 0 degC. You can see in the attached plot that it starts to jump jump significantly depending on whether it is charging or discharging.

What could be causing this behaviour?

More info:

  • Battery has LiFEPO4 chemistry
  • Battery firmware is a production image for this battery, as such it is not calibrated for the specific device 

Your prompt response will be much appreciated.

Thanks in advance,

Aaron

  • 0
    TI__Genius 12215 points

        From the plot, I can only see the SOC ramping up and down according to charging or discharging, per the scale of horizontal axis, it does not seem to be a sudden jump rather a SOC ramping up and down caused by charging or discharging.

       Maybe a log file could be more helpful for further inspection?