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BQ34Z100: BQ34Z100

martin gibbs
Intellectual 520 points
Part Number: BQ34Z100


Is there an explanation for this behaviour please?

An 8S Li Ion battery

Following a part charge to 49%.

- After a brief discharge to 45% the fuel gauge realigns to 100%.

- After conclusion of the discharge to Cell BL Set Volt Threshold = 2750 * 8 cells = 22000mV, the gauge corrects itself to 0% and all is ok again.

Thankyou

  • 0
    TI__Mastermind 34775 points

    Hi Martin,

    Can you provide the log file, gg file and srec file? We will take a look and get back to you.

  • 0 in reply to Damian Lewis
    Intellectual 520 points

    Hi Damian thanks for getting back so quickly.

    The gg file and the senc file are attached but the log file was provided by a concerned customer. I have imported into excel but it is not the standard bqeasy format unfortunately.

    I was interested in if there was any classic causes of this effect you could possibly recall, that I could look into. But if you could take a look at the gg file it would be much appreciated. zip.zip

    Regards

    Martin

  • 0 in reply to martin gibbs
    TI__Mastermind 34775 points
    Hi Martin,

    Not sure how the customer piece together the plot (CHART2) you showed here, but the CHART1 in the spreadsheet matches the data logs. There's something strange going on in the application because I can see RSOC and Battery Voltage dropping when the reported Battery current is zero. If they can figure out what's causing the drop in RSOC and Battery Voltage when Battery current is zero, it will help explain the jump in RSOC that occurred on the subsequent discharge cycle. That charge wasn't seen by the gauge coulomb counter and may have resulted in an lower incorrect FCC value to be updated after charging causing the RSOC to jump.