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BQ34Z100-G1: ChemID selection

Simeon Höhn
Prodigy 30 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: GPCCHEM, BQSTUDIO

Hello all,

I have a question regarding the selection of the chem id.

We use the following battery pack:

Datasheet: https://www.feyelektronik.de/downloads/db-pa-lnb46e-c17ul-4-1-r002.pdf

TSR: https://www.feyelektronik.de/downloads/un-tsr-pa-inb46e-c17ul-4-2-r002.pdf

These consist of two cells of the type "LG Chem, INR-18650MJ1" in parallel. The ChemID for this INR-18650MJ1 is 2059.

Can and/or should  I use ChemID 2059 for this pack of two parallel cells?

Thank you in advance.

Kind regards,

Simeon

  • 0
    TI__Mastermind 37981 points

    Hello Simeon,

    I would recommend using the GPCCHEM tool. This tool uses a simple test of your battery to match it with batteries that have already been characterized.
    When you use this tool, a report will be sent to you that gives you the ChemID that closely matches your battery. Please reference
    this website: https://www.ti.com/tool/GPCCHEM

    I think it would be important to use this tool to verify the proper ChemID for your battery.

    Sincerely,
    Nick Richards

  • 0 in reply to Adrian
    Prodigy 30 points

    Hello again, thank you for your answer

    I tried to do this test to my best understanding.

    I logged the charge,relax,discharge,relax cycle with bqstudio. Then i did upload the .zip file.

    According to the report, I should use ChemID 1671. In bqstudio this ChemID is Obsolete and DoNotUse. Also its a LiMn2O4 Cell, but were using two INR-18650MJ1, which are LiIon Cells. All other recomendations for ROM based devices are LiCoO2 cells.

    Best chemical ID : 1671 Best chemical ID max. deviation, % : 3.17



    Summary of all IDs with max. DOD deviation below 3%

    Chem ID max DOD error, % Max R deviation, ratio
    0 0 0

    Warning: Deviation is above recommended level. New chem ID needs to be released for this cell. Please contact your TI representative to send the cell to Dallas for characterization

    Did I do something wrong with logging? Did I take to much time while in relaxation?

    Thank you again,

    Simeon Höhn

  • 0 in reply to Simeon Höhn
    TI__Mastermind 37981 points

    Hello Simeon,

    Can you send me the .zip file that you upload to the GPCCHEM tool. Also, can you send the report file too.
    I want to take a look at these to make sure everything looks correct.

    Sincerely,
    Nick Richards

  • 0 in reply to Adrian
    Prodigy 30 points

    GPC+report.zip

    Thank you in advance.

    Kind Regards,

    Simeon Höhn

  • +1 in reply to Simeon Höhn
    TI__Mastermind 37981 points

    Hey Simeon,

    I reviewed the files you sent, and I noticed a few problems with the data collected.

    First, it will be better to use column 12 for temperature. Column 20 is the internal temperature of the device.
    Second, I noticed that the temperature you ran this test at is really high. The test starts at around 33 Celsius, and only
    goes as low as 26 degrees Celsius. Ideally, when running this test, the battery should be at room temperature, so around 20 to
    25 degrees Celsius.
    Third, the discharge current is changing. This current should stay constant throughout the whole discharge. Also, you are discharging
    the battery at too large of a rate. According to the datasheet of the battery pack you sent earlier, the capacity of the battery pack
    is 6.7 Ah, so to discharge at C/10, you should be discharging the battery pack at 670 mA.

    Please address my concerns above and rerun the test.

    Sincerely,
    Nick Richards

  • 0 in reply to Adrian
    Prodigy 30 points

    Hey Nick,

    we changed the issues you pointed out.

    GPCHEM Tool got us ChemID 2100, which seems to be a good fit for us.

    Thank you for your help.

    Kind regards,

    Simeon Höhn

  • 0 in reply to Simeon Höhn
    TI__Mastermind 37981 points

    Hey Simeon,

    Glad I was able to help!

    Sincerely,

    Nick Richards