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BQ40Z50-R2: Update status 0x4

Danilo A.
Mastermind 34130 points

Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQSTUDIO

Hi Team,

Posting on behalf of our customer.

I am working with a 3s3p battery pack built using Molicell INR18650-M35A cells. I recorded a log at a pack voltage of 12.6 V (4.2 V per cell), and based on that data I was recommended ChemID 7607 with a 97% match.

I am running the learning cycle: I enable the gauge, perform a full discharge, and then let the pack relax for 5 hours. However, the Update Status does not change to 0x05.

I have a question regarding my system conditions. In my application, the battery pack is charged only up to 12.45 V (4.15 V per cell), with a taper current of 350 mA. When I run the learning cycle at this voltage, Qmax does update, but the Update Status still does not transition to 0x05, even after waiting up to 5 hours.

Am I performing the procedure correctly? Or should I first complete the learning cycle at 12.6 V and then reduce the charge voltage afterward? Alternatively, should I be selecting or generating a ChemID specifically for operation at 4.15 V per cell?

Regards,

Danilo

  • 0
    TI__Mastermind 45015 points

    Hello,

    This question has been assigned within the team and will be reviewed and followed up with another application engineer when possible. In the meantime please attach any associated .log/.gg files associated with the projects

    Thank you,
    Alan 

  • +1
    TI__Genius 9425 points

    Hello Danilo,

    Based on my understanding of your post: You are stuck at the 1st discharge of the learning cycle.

    Can you please provide a datalog of your learning cycle? That way I can get a more accurate response on what might be happening.

    Danilo A. said:
    Am I performing the procedure correctly? Or should I first complete the learning cycle at 12.6 V and then reduce the charge voltage afterward?
    • When your battery is empty make sure:
      • Make sure the voltage of the cell does recover once the load is released.
      • The FD bit is triggered
      • The SoC reported is 0
      • Dod0 updates as a OCV measurement is taken. This is a column in the datalog from BQstudio.
      • You might need to wait longer than 5hrs depending on your battery chemistry.
    Danilo A. said:
    should I be selecting or generating a ChemID specifically for operation at 4.15 V per cell?

    No. if your ChemID is within 3% Dod error, then you should be fine.

    Danilo A. said:
    Or should I first complete the learning cycle at 12.6 V and then reduce the charge voltage afterward?

    No. your learning cycle should work fine at any charging voltage as long it is matching the ChemID.