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Battery Chemistry ID

Benn
Prodigy 170 points
Other Parts Discussed in Thread: BQ27541, BQ27510EVM, GASGAUGECHEM-SW, BQ27541-V200

Dear all

I use bq27541 to manage battery pack. But the battery chemistry ID is unknown. So I follow the steps as chemselect_cont.pdf said.

Step 1. Charge battery pack to 4.2V and current less than C/100

Step 2. Start EV software logging

Step 3. Relax for 2h

Step 4. Discharge  at C/10 to 2.7V

Step 5. Wait for 5h

Step 7. Use chemselect_cont.mcd worksheet to find chemical ID

 

But I fail to calculate it all the time. Why? Is the method not correct? Or...

Chem_Cycle20.zip
  • 0
    TI__Expert 4050 points

    Benn,

     

    one possibility is that the calculated chem ID has error greater than 3%. Looks like either the chem database need to be updated or a new ID is needed. Can you double check if the Chemdat.2, chemdat.4 and chemdat.6 the mathCAd uses are up to date?

     

    Thanks

    Ming

  • 0 in reply to Ming Yu
    Prodigy 170 points

    Ming,

    I'm not sure whether Chemdat files are up to date or not. If those files are not up to date, where can I get the latest files. If those files are up to date, what should I do?

     

    Thanks & best regards

    Benn

  • 0 in reply to Benn
    TI__Genius 14985 points

    Here is the latest version of the Mathcad chemistry selection worksheet and corresponding chemdat files:

    http://www.ti.com/litv/zip/sluc138l

    Some of our gauge product folders have a link to it and some don't.  We need to make it more consistent for you to find it!  I found this link in the bq27510EVM folder.

     

    Also periodically we release a chemistry updater which is located here:

    http://focus.ti.com/docs/toolsw/folders/print/gasgaugechem-sw.html

    Most of our gauge product folders have a small obscure link to it in the Tools & Software section.  I see it in the bq27541 product folder, but not in bq27541-V200.

    Run the installer and it will put all the latest chemID files in your EVSW folder to be available in bqEASY.

  • 0 in reply to dMax
    Prodigy 170 points

    dMax

    Thanks Ming! I have downloaded these latest files and try it again, but the it couldn't get a chemistry ID too.

    Can you help me to calculate it? The attachment is the logging data. I hope you can download it.

     

    Thanks & Best regards

    Benn

    Chem_Cycle20.zip
  • 0 in reply to Benn
    TI__Expert 4050 points

    Benn, best chem ID = 120 with max error < 0.69%.

     

    Ming

  • 0 in reply to Ming Yu
    Prodigy 170 points

    Ming

    Thank you so much, Ming! It takes me one month to calculate it. How did you do that?

    Benn

  • 0 in reply to Benn
    TI__Expert 4050 points

    Benn,

     

    II am really sorry to know that you have spent one month on chem ID. We constantly update the chem database and if the chem ID does not have a good matching(error<3%) then you will not have a concluded results. Next time, please send the log file to us so we can calculate it for you.

     

    Thanks

    Ming

  • 0 in reply to Ming Yu
    Prodigy 170 points

    Ming,

    OK! Thank you so much, you have done a big favor for me.

     

    Thanks & Best regards

    Benn