• State
  • Locked Locked
  • Replies 6 replies
  • Subscribers 63 subscribers
  • Views 1115 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ34Z100-R2: The SOC fluctuates and lacks consistency during a charge/discharge cycle.

Andrianina Andriamanga
Prodigy 40 points
Part Number: BQ34Z100-R2
Other Parts Discussed in Thread: BQ25820, GPCCHEM, BQSTUDIO

Tool/software:

Hello,

I would like to request your help, as I am currently performing a charge and discharge cycle in order to retrieve the golden image. However, the SOC value fluctuates significantly and is inconsistent. I am attaching the log of my procedure.

I am using an electronic load to discharge at a constant 2A and stop the discharge at 11V. The battery I am using is a RELION RB-20.

I am also using the BQ25820 charger, charging at 4A/24V.

I would appreciate it if you could share any ideas regarding the potential origin of the issue.

Feel free to ask if you have any questions or need further information.

Thank you very much for your help.

log problème 0%.xlsx

  • 0
    TI__Mastermind 26765 points

    Hello Andrianina,

    It does appear your SOC has a harsh transition throughs the end, could verified what your ChemID difference error % is from the GPCCHEM tool report.

    Thank you,
    Alan 

  • 0 in reply to Alan Frias
    Prodigy 40 points

    Hi Alan,

    Thank you for your response. We do not have access to GPCCHEM with this charger (I do not know why). Therefore, we do not have a log. But I believe we have chosen the correct battery chemistry because we found the cell in the list provided by TI in the Chemistry tab. We opened a battery to check the cells, and TI had already included this cell in the list.

    Thank you again.

  • 0 in reply to Andrianina Andriamanga
    Prodigy 40 points

    Here is the cell that we use (TenPower IFR26700-40HE) : 

    Where could I find the parameters behind this configuration to confirm if it matches the datasheet of our cells?

    Thanks a lot for your help!

  • 0 in reply to Andrianina Andriamanga
    TI__Mastermind 26765 points

    Hello Andrianina,

    There is no way for the user to view the parameters behind this configuration since this is confidential information. Eventhough the cell is listed in the ChemID we still recommend since we can't control if the battery cell fab decided to change there cell and still keep the same P/N, which is not a rare instance. We still recommend running a GPCCHEM report to see if this chemID is truly the best fit for your cell.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    Prodigy 40 points

    Hi Alan,

    Ok, I understand. So, how could I found and use the tool GPCCHEM. Here is a screenshot of Bqstudio when I choose this gauge : 

    I do not have access to the GPCPackager with this ref of gauge. How can I proceed?

    Thank a lot

  • 0 in reply to Andrianina Andriamanga
    TI__Mastermind 26765 points

    Hello Andrianina,

    Follow the GPCCHEM report instruction and submit the necessary files it requested. This is not a tool internal to BQStuido rather it is a tool outside of the software. Once you do submit your required files you will get a file similar to the image below and than you would use the chemID with the lowest "deviation, %". Once you get your chemID you would then go into BQStudio>>Chemsitry>>ChemID>>Program selected chemistry.

    GPCCHEM:
    https://www.ti.com/tool/GPCCHEM

    Thank you,
    Alan


    *Only an example DO NOT USE ON YOUR APPLICATION