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BQ27Z561-R2: SOC drops issue

Statham Su
Genius 4990 points
Part Number: BQ27Z561-R2

Hello Sir:

Please help to check our log file.

Our SOC from 9% drops to 0%.

Would you please provide some recommendations for us and teach us how to solve this issue?

Looking forward your feedback.

Thanks a lot.

1213.log.xlsx

  • 0
    TI__Guru 57697 points

    Hello Statham,

    1. Was the chemistry matched and programmed?

    2. Was a learning cycle completed successfully before this log was taken?

  • 0 in reply to Shirish
    Genius 4990 points

    Hi Shirish:

    Yes, they have been programmed the chemistry ID.

    This battery pack has been mass production.

    According their log file and gg file, I think that dsg threshold and relax threshold are not right.

    Would you please help to check their gg file and provide recommendations?

    Thanks a lot.

    20221219.gg.csv

  • 0 in reply to Statham Su
    TI__Guru 57697 points

    Hello Statham,

    You are right on the Dsg threshold. There is a discharge at below -60 (dsg threshold) for long periods, so that definitely needs to be updated.

    Load Select /Load mode is set to present average discharge power. The load is varying. In the log, i see that RemCap drops to zero after current suddenly rises from -56 to -650 (Line 17862). The capacity of the battery is different for different loads. The sudden change in load results in recomputation based on load select/load mode and it correctly drops to 0 because the present average discharge power changed.

    To avoid this set Load Select to be closer to the higher side of the varying load. Value of 7 will be suited of the load profile is similar in all discharges. A value of 6 will allow setting a custom load. If the load is unpredictable, then always go with the highest possible User rate.