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use bqstudio to log values for GPC

Yoav Gross
Intellectual 365 points
Other Parts Discussed in Thread: BQSTUDIO, GPCCEDV, GPCCHEM, BQ78350

hi,

I am using bqstudio 1.3.52, and I cant find the option to log a cycle of charge/discharge for my chemId calculation by the GPC.

how do I create those logs?

which values do I need to log?

is temperature important? I dont have thermistors at hand.

is discharge enough, or do I need charge as well?

thx,

Yoav

  • 0
    TI__Guru 73830 points
    The bqStudio program does not have the Learning Cycle plug in to help with running the log files to support the GPCCEDV tools. You will have to run those manually by charging and discharging the pack. You can use bqStudio to log the data using the Start Log button and providing a file name.
  • 0 in reply to ThomasCosby
    Intellectual 365 points
    Thomas, thank you for your answer.

    Is it enough to send a charge/discharge logs to get a ChemId from the online GPCCEDV? I have seen some places requiring a charge and discharge (C/10), but in some places it says I have to log discharge only at different temperatures (this is harder... need to control temperature).

    My question is: which log is needed to get the ChemId of my pack?
  • 0 in reply to Yoav Gross
    TI__Guru 73830 points

    Yoav

    You will need to use the GPCCHEM tool to find a ChemID match and the tool requires a charge and discharge at room temperature. There should be a 2 hours rest period between the charge and the discharge and a 5 hour rest after the discharge. The pack should be charged to charge termination and the discharge rate should be between C/10 and C/5.

    Tom

  • 0 in reply to ThomasCosby
    Intellectual 365 points
    Thx again Tom,

    In the "Simple Guide to Chemical ID Selection Tool (GPC)" it states "The battery pack must use one of TI’s Impedance Track algorithm-based fuel gauges". my fuel gauge is not an impedance track GG, its bq78350 - CEDV gas gauge.
    Am I looking at the wrong tool?
  • 0 in reply to Yoav Gross
    TI__Guru 73830 points
    Yoav,
    You do not need to have a good ChemID match for a CEDV gauge. The device only uses the OCV table one time and that is when the cells are attached or if the device is reset. You can find a match and update the chemistry data, if you want to ans you will use the GPCCHEM tool to do that. The GPCCEDV tool is used to calculate the seven CEDV coefficients for CEDV gauges and it requires six sets for data. the six sets of data will include three temperature ranges and two discharge rates and it does not require charge data in the files.
    Tom