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Original question:

BQ35100: Error from TI Gauging Parameter Calcukator

BQ34Z100EVM: Chem ID selection tool not accepting my data

Julian Eyre
Prodigy 240 points
Part Number: BQ34Z100EVM
Other Parts Discussed in Thread: GPCCHEM

Hi,

I am trying to perform a Chem ID test with a LION battery pack.

However, TI Gauging Parameter Calculator reports the following errors:

Accuracy Error: Deviation is so high that it is most likely due to anomaly in the data. Please check that data files have recomended format, units and test schedule

I have reviewed the log file and it seems correct to me.  Even a plot in Excel looks like the example plot given in the Chemical ID Selection Tool (GPC) Guide.

My accuracy satisfies the requirements given in that guide my config.txt file is correct.

I used the latest BQ Studio to generate the log file, and I stripped the extraneous text as required, leaving only the column headers as specified.  I have attached the zipped log and config files to this message.

Can anyone suggest why the Chem ID selection tool is not working?

3162.roomtemp_rel_dis_rel.zip

  • 0
    TI__Mastermind 42535 points

    You just need elapsed time, V, I, and T. The rest can be removed.

  • 0 in reply to Batt
    Prodigy 240 points

    Hi Batt,

    According to the ID Selection Tool Guide:

    "The columns can be in any order since the column positions are defined in the config.txt file. The log file
    can have some other data columns that are not used in this tool (removing them is not required) if the size
    of the .zip file prepared for submission does not exceed 2 MB."

    My config.txt file clearly specifies which columns should be used, so it should not be necessary to remove the extraneous columns.

    Nevertheless, I did what you suggested and removed all extraneous columns.  It still was not accepted.

    Regards,

    Julian

  • 0 in reply to Julian Eyre
    TI__Mastermind 42535 points

    Please upload your log here, we will take a look.

  • 0 in reply to Batt
    Prodigy 240 points

    Log uploaded as zip file.

    Log only includes elapsed time, V, I. Temp as suggested.  All headers removed.

    Regards,

    Julian

    3465.roomtemp_rel_dis_rel.zip

  • 0 in reply to Julian Eyre
    TI__Mastermind 42535 points

    Julian,

    I did get the results back for your log from GPCCHEM. Your error in this is high. Your max cell V seen here is 15820mV. That translates to 3955mV per cell. That doesn't sound like Vmax for a Li-ion cell.

    Please chg it to full or send your cell DS so that we can see what's going wrong here.

  • 0 in reply to Batt
    Prodigy 240 points

    Hi Batt,

    I just re-ran a discharge cycle with a freshly charged battery (last time there was a delay between charging to full and starting the test), and I successfully got a report back.  Thank you for your help in this.

    However, it has a max deviation of 3.72%.  This is only a little above the recommended max level of 3%, so will it matter that much?  I do not need super-accurate results.

    Also, my battery pack has 2 parallel banks of 4 cells in series.  Does it matter that there are 2 parallel banks?  Or should I halve my current before sending the data for the chemical ID analysis? (The config file allows the specification of 4 cells in series, but has no option to indicate how many parallel banks there may be).

    Regards,

    Julian

  • 0 in reply to Julian Eyre
    TI__Mastermind 42535 points

    Hi Julian,

    I'm happy that the tool gave you results this time. The deviation is not really bad. You can get acceptable results with that. No, you don't need to characterize your battery pack again. The gauge can accept parallel banks of cells as one stack.