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Update Status and Max Error bq20z65-r1

Michel DELVAUX85
Prodigy 40 points
Other Parts Discussed in Thread: BQ20Z65-R1

I try to do a golden file with bq20z65-r1 and battery from A123 ANR26650m1B.

I follow all application report without success:

When I do learning cycle, I enable IT and Update Status change to 04.

I charge the battery at C/2. When the charge is done, I have FC enable in Battery Status.

After 2 hour or more of relaxing, Update Status stay to 04 and Max Error to 100%

I had tried the same design with a different battery (US18650VTC3) with success.

I have an old design with ANR26650m1B but I hadn't problem to do the golden file.

For ANR26650m1B, you have 2 ID for the chemistry: 0440 and 0453, for my old design I used 0440, what's the difference?

Thank you for your help.

Michel

  • 0
    TI__Expert 3385 points

    Hi Michel,

    It seems like you are having trouble completing a successful learning cycle. Before completing the learning cycle, it is imperative to determine the best ChemID match for the cell you are using. To do this, you can simply run a test (relax-discharge-relax) which you can read in more detail here.

    After you run this test, you can submit your results to our GPC chem selection tool, and you will find the most accurate chemID to use with your cell. This will give the gauge an initial resistance table to use before IT helps to learn to more accurate values.

    Once you have determined the best ChemID to use, you can start your learning cycle. First discharge to completely empty, relax for 5 hours, send IT enable and reset command. Your update status should change to 04.  Charge to full and FC should change to 1. Relax for 2 hours and update status should change to 05. Discharge at c/10 rate and lastly relax for 5 hours and at this point update status should change to 06 and you know you completed a succesful learning cycle.

    About the different ChemIDs: sometimes you might see multiple chemID assigned to a single model number for a cell. However, when battery manufacturers produce batteries, their process may change, and there can be slight electrical variances, which lead to difference resistance profiles. To ensure a proper ChemID, please follow the test and use our GPC tool to determine the best match.

    Best,

    Justin