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BQ27542-G1: Determining Chemistry ID

Dale Gifford
Prodigy 120 points
Part Number: BQ27542-G1
Other Parts Discussed in Thread: GPCCHEM, BQSTUDIO

I'm trying to find the best match of a Chemistry ID for a Lithium Ion battery cell. The exact cell part number and manufacturer are not listed in BqStudio so I collected the data as outlined in the "Simple Guide to Chemical ID Selection Tool (GPC)". The instructions indicate collecting a rest, discharge, rest log for the cell, then zip together a config.txt and name the log file "roomtemp_rel_dis_rel.csv". I did all of that and submitted the file to the GPCCHEM web page successfully. But the ZIP file is not accepted, with the error messages:

There was a problem with the content of the zip file.

  • Invalid Zip File Member - roomtemp_rel_dis_rel.csv
  • Required file 'hightemp_highrate.csv' is missing from the input zip file.
  • Required file 'roomtemp_lowrate.csv' is missing from the input zip file.
  • Required file 'lowtemp_highrate.csv' is missing from the input zip file.
  • Required file 'lowtemp_lowrate.csv' is missing from the input zip file.
  • Required file 'hightemp_lowrate.csv' is missing from the input zip file.
  • Required file 'roomtemp_highrate.csv' is missing from the input zip file.

Are the instruction on the web page incorrect?

  • 0
    TI__Mastermind 25955 points

    Hi Dale,

    It looks like in your config.txt is missing the line:

    ProcessingType=2

    Please ensure this is set to use the GPCCHEM tool. In addition, please make sure the following settings are also provided in your config.txt file (your values may vary). This tells the tool what test you want to run, how many cells are in series, and which columns of the csv file correspond to elapsed time, voltage, current and temperature, respectively.

    ProcessingType=2
    NumCellSeries=1
    ElapsedTimeColumn=0
    VoltageColumn=1
    CurrentColumn=2
    TemperatureColumn=3

    More information can be found here: http://www.ti.com/lit/an/slva725/slva725.pdf


    Sincerely,
    Bryan Kahler

  • 0 in reply to Bryan Kahler
    Prodigy 120 points

    Hi Bryan,

    The config.txt file contains all of the required lines, just like the instructions indicated.

    I've attached the ZIP file for you to examine and comment on.ChemistryID.zip

  • 0 in reply to Dale Gifford
    TI__Mastermind 24870 points
    Hello Dale,

    Please try and round everything to the nearest integer and re-run this through the GPC tool
  • 0 in reply to Kang Kang
    Prodigy 120 points

    Hi Kang,

    I never would have guessed that the file's content was an issue, based on the error messages. There is nothing in the error messages complaining about the format of the data. The only complaints are about invalid files and missing files. If the data format is incorrect then the error messages in the report file are very misleading. Perhaps somebody at TI could enhance the report generator to incorporate better error message reporting?

    I formatted the data exactly as requested in the document describing the instructions for submission, "Simple Guide to Chemical ID Selection Tool (GPC) SLVA725–September 2015". Contrary to your suggestion, the document includes 10 lines of sample data that include 3 decimal digits (see the attached screen shot below). If the instructions in the document are incorrect then perhaps somebody at TI could update the document to include the correct sample data format?

    Even though none of your suggestions so far seem to be related to the error messages, I've changed the format of the data and truncated everything to integers as you suggested. And I still get the same error response.

    I've attached the latest iteration of my log data so that you can try submitting it to the GPC Chem tool. Just to be sure, this is the URL of where I'm trying to submit the ZIP file: https://www.ti.com/powercalculator/docs/gpc/gpcUpload.tsp 

    My goal is very simple, I need to create a golden file for programming into the BQ27542 for production. The first step in the process is determining the correct Chemistry ID. So far I've spent more than a week and I'm unable can't get past the TI website and instructions for determining the chemistry ID. Is there any way to improve the support that I'm getting from TI?

    ChemistryIDD.zip

  • 0 in reply to Dale Gifford
    TI__Guru* 76230 points
    Hello Dale,
    Sorry for your frustration. I ran your files and i am indeed getting the same results you are getting. The servers where the tools are stored are undergoing some changes, so that must have caused the issues you are seeing. I have alerted the responsible team and I hope we will will have it fixed and working by tomorrow.

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 120 points

    Hi Onyx,

    Thanks for following up. I was thinking about how the TI servers "probably" analyze the two files contained in the ZIP archive:

    1) Config.txt

    2) roomtemp_rel_dis_rel.csv

    On a whim, I guessed that if the servers failed to parse the Config.txt file and were unable to properly determine the "ProcessingType" as suggested by Bryan, then that might produce the error messages reported back to me. So I took a closer examination of the Config.txt and discovered, to my surprise, that it was Unicode Encoded with 16 bit characters instead of plain ASCII (8 bit characters). The same was true for the roomtemp_rel_dis_rel.csv file. I re-processed both files and converted them to plain ASCII files.

    Now the files are accepted by the TI Server, and I got a reply saying that the files were being processed and I would get a result in an hour. Well, that was more than 48 hours ago. I'm still waiting...

    I did try submitting the updated files a few more times, changing the data format back to the original format with decimal digits. The submissions were all accepted, but still no response with the chemistry IDs.

    So at this point in time, I don't know what to do. The files have been submitted but no response from the TI servers. I've attached an updated ZIP file, with the plain ASCII files for you to test with.

    Is it possible for you to check with the responsible team to see what has happened to my submissions?

    ChemistryIDF.zip

  • 0 in reply to Dale Gifford
    TI__Intellectual 1090 points

    I was able to get the results by opening your archive, and re-archiving it without directory structure

    and submitting to the tool.

           
    Best chemical ID : 194    Best chemical ID max. deviation, % : 1.83   

    The tool expect that zip file contains just the files, and not folders. While it can tolerate one folder, it looks like it gets confused if there is a complex folder structure. In your zip file there was multy-folder structure:

    *****.zip\folder1\folder2\folder3\folder4\files

    It should be just:

    *****.zip\files

    Regards,
    Yevgen

  • 0 in reply to Yevgen Barsukov
    Prodigy 120 points

    Hi Yevgen,

    Thanks for the reply, and thanks for sending me the chemistry ID. I can begin using the Chemistry ID now.

    I took a look at the ZIP file I had created and, as you indicated, there were additional folder layers that were probably confusing the TI server software. I modified my script that creates the ZIP file to just include the files without the additional folder hierarchy.

    I have three potential battery cells that I'm evaluating, so I wanted to make sure that I would be able to perform the same procedure for the other cells. So I've submitted the updated ZIP file to validate that it's acceptable to the TI servers and get back the automated response. The ZIP was accepted but I have not yet gotten a response and it's been more that 20 hours. I've checked my spam folder to make sure the reply didn't get tossed out.

    So at this point in time, I appreciate all the help that you, Bryan, Kang, and Onyx have provided, but I'd like to get to the point where I can repeat it without having to pester you and the others that have helped me get this far.

    Can you take a look at the TI servers and find out why I haven't gotten a response from the latest posted ZIP file? I've attached it to this reply in case you need to examine the ZIP or the content of the" Config.txt" or "roomtemp_rel_dis_rel.csv" files.

    ChemistryID.2018-02-17.zip

  • 0 in reply to Dale Gifford
    TI__Intellectual 1090 points

    Dale,

    when I submitted your file to the server over the same web-interface, I received the report successfully.

    It is still the same:

    Best chemical ID : 194    Best chemical ID max. deviation, % : 1.83

    Since this is highly unusual not to receive an answer (normally you would receive an error report if something is wrong) I suspect that something is different either with your e-mail server (for example antivirus is blocking zip attachments) or e-mail address itself.
    I would try to log-in from a different e-mail system (for example using g-mail) and see if problem disappears.

    Regards,
    Yevgen

  • 0 in reply to Yevgen Barsukov
    Prodigy 120 points
    Hi Yevgen,
    I did as you suggested and submitted my ZIP file from a gmail address and I get the automated response in about 15 minutes. Many thanks for your help.

    It turns out that our company uses a spam service that examines all incoming email prior to sending it to our email server. The address used by the GPCCHEM tool was being blocked. I've added it to a white list at the spam filter service and now everything is working fine.

    Thanks again for your help.