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BQ27Z561: Steps to generate the ChemID & Golden Image

Other Parts Discussed in Thread: BQ27Z561EVM-011, GPCCHEM, BQSTUDIO

Battery Information

Nominal voltage = 3.8V.

Battery Capacity is 4000 mAH

  1. Battery is connected to fuel gauge and fuel gauge is connected to PC
  2. In the BQ Studio Clicked on the Read All button in the Data Memory window. & Exported text file with a .gg.csv extension, now i have modified below parameters in that file.
    1. [Gas Gauging][State][QMax]: 4000 
    2. [Gas Gauging][IT Cfg][Term Voltage]: 3.0V
    3. [Gas Gauging][Advanced Charge Algorithm][Charge Term Taper Current]: 200mA
    4. [Gas Gauging][Advanced Charge Algorithm][Low/Standard/High/Rec Temp Charging][Voltage]: 4.2
  3. Imported modified .gg.csv file to the bq studio.
  4. Clicked on Write_All button and flashed parameters [Verified parameter after Read All  Button  and checked all modified parameter in the BQ studio Data Memory.]
  5. Setting Chem ID
    1. Selected ChemID: 4.4 V (ID 3142)  [As our battery dont have any listed IDs, we have selected 3142 as per bq27z561EVM-011  user guide]
    2. Clicked "Program Selected Chemistry"
  6. Now i go to the Watch window and added below register & started logs.
    1. Voltage
    2. Current
    3. Temperature
    4. Relative State Of Charge
    5. Full Charge Capacity
    6. Remaining Capacity  
  7. After i am continuing the charging till my battery [state of charge shown in UI of BQ Studio] reach to 100%
  8. I have removed the charging and make relaxing state for battery up to 2 hours.
  9. I am putting battery on discharging using constant discharging current till its reach to 0% Battery [state of charge shown in UI of BQ Studio].
  10. After reaching 0% now putted battery on relax state for next 5 hours.
  11. Logs saved as .CSV file and rename file as roomtemp_rel_dis_rel.csv.
  12. Now made config.txt file as below notes.
    1. ProcessingType = 2
    2. NumCellSeries = 1
    3. ElapsedTimeColumn = 0
    4. VoltageColumn = 1
    5. CurrentColumn = 2
    6. TemperatureColumn = 3
  13. Combine both .csv file and .txt file in zip folder and attached on TI mentiond links.
  14. Now TI will give me the Chem ID as per our application.

Query[1] Is this all steps are correct for generating chem ID? If its not proper step kindly suggest.

Query[2] How to generate golden file image for our application?

Query[3] How to test golden image on EVK?

Query[4]  First received logs is such like that

  1. Voltage - 3.4V
  2. Current - 0
  3. Temperature - 23.5
  4. Relative State Of Charge - 3%
  5. Full Charge Capacity - 5075
  6. Remaining Capacity  - 128

After few minutes of charging state

  1. Voltage - 3.5V
  2. Current - 180mA
  3. Temperature - 24.5
  4. Relative State Of Charge - 4%
  5. Full Charge Capacity - 5075
  6. Remaining Capacity  - 208mA

Why full charge capacity is showing 5075mA while i have already set the Qmax=4000mA?

  • Hi Pratik
    The correct steps to getting your gauge functional is as follows:
    - first identify your chem id by following the steps listed for gpcchem. It appears you followed this. What chem id was returned to you via email as a close match for your cell. If you didn't receive a file, you should update the file submited on here so i see what you did wrong in the file.
    -Next step would be to configure your gauge for your application and perform a learning cycle. We have materials that describe the learning cylce and there is a video as well:
    training.ti.com/how-perform-successful-learning-cycle-gauges

    Once learning cycle is complete then the gauge will be able to calculate soc correctly.

    thanks
    Onyx
  • Hello Onyx,

    I tried to submit the data to mentioned link in the document as required format, but i got the report with 0 written on it only.

    Here i am attaching the below listed things

    1) Data_TI.rar [Contains document submitted to TI for ChemID generation]

    2) Test-report.rar [Contains Received the reports from the TI]

    3) Test.rar [Actual report file generated from BQStudio after complete cycle of charging & dis-charging]

    Kindly let me know whats wrong goes here.

    Also i have observed in the logs while battery is in charging state; once data reached to 98% than its started decreasing up to 78% while still charging is continue & No load is attached with battery. so i put the battery in 2 hour relax state and Afterwards started Dis-charging state so Dis-Charging started from 78%. [Kindly check logs in the Test.csv file from 24188 Raw onward] let me know your comments on this observation.]

    Data_TI.rar

    Test-report.rar

    Test.rar

  • Pratik,

    Pls review the instruction manual for gpcchem. Your current and voltage graphs are nothing close to the corresponding images in the user guide.
    Your experiment should be performing using constant current and the discharge rate specified in the user guide.

    thank
    Onyx
  • Hello Onyx,

    As per the instruction in manual should i have to charge the battery at 800mA as per my application ?

  • the charge value is not as important as the discharge rate. just make sure to charge in cc/cv mode. a c/2 rate for charge is ok
    thanks
    Onyx
  • For taking the logs of charging & dis-charging, i have used voltage & current register used for watch.
    Should i take average current register reading for charging & dis-charging?
  • Hi Pratik, the voltage and current and temperature values are what is important. Pls use the log functionality of bqstudio not the watch functionality
    thanks
    Onyx