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Chem ID matching for Lead-Acid batt Varta E39 (70Ah)

Shlomy Sasson
Prodigy 90 points
Other Parts Discussed in Thread: GPCCHEM, BQ34Z100EVM, BQ34Z100-G1, BQ34Z100, BQSTUDIO

Hi,

I'm trying to find chem id for BQ34ZTI_only_BATT.xlsx100-G1

Using arbin we recorded the charge in C/10 and discharge in C/10 (7A)  for the battery but I can't run on mathcad the chem id selection tool,

Its 12V battery Lead-Acid 70Ah

Can someone please run the chem selection tool on mathcad for me?

Thanks

Shlomy

  • Prodigy 90 points

    By mistake I uploaded the file in the middle of the text,   here is the file again in zip format:

    TI_only_BATT.zip

  • in reply to Shlomy Sasson
    TI__Guru 73830 points
    The Mathcad tool could not find a ChemID match for your data. Have you reviewed the guidelines for collecting data on the GPCCHEM website? You need to include temperature data and a rest period before the discharge. It is also better to also include the charge data in the log file. You can run the GPCCHEM tool to find the ChemID.

    www.ti.com/.../GPCCHEM
  • in reply to ThomasCosby
    Prodigy 90 points

    Hi Tom,

    I reviewd the guidlines for running the mathcad too they was a little bit different since they didn't mantioned that temorature should be recorded/

    I did included the rest period between the charge and the discharge but I do not have a way to measure and record the temrature,

    since the temprature was close to room temprature during all the test, I filled the temp coulmn with 25 deg,  I'm not sure how to measure the cell temprature since the battery is closed.   Is it ok to fill the temprature coulmn with 25 deg?

    Thankz

    Shlomy

  • in reply to Shlomy Sasson
    TI__Guru 73830 points

    Shlomy,

    The cell temperature is require to get a good ChemID match. It could attach the thermistor to some point on the battery where the temperature can be conducted from the cells, then this would help. If there is some bulk metal on the positive or negative contact, then this may be a good place. I attached the guidelines for collecting the data for the program.

    Tomslva725.pdf

  • in reply to ThomasCosby
    Prodigy 90 points

    Hi Tom,

    Thanks for your answers,  I am using BQ34z100EVM (I replaced the BQ34Z100 chip to BQ34Z100-G1),  on the EVM the thermistor is already installedc so I can't put it on the battery,  I putted the EVM on the battery so the thermistor is as close as it could be to the battery,  and I got a chemical match - chmical ID of 806.

    But now I have different problem,  I'm trying to update  the: Design Capcaity, Design enrgy, Qmax Cell 0 values but I'm not sure what to write there, 

    The battery I use is 6 cell 70000mAh 12V AGM - (Varta E39),   and when I try to update Qmax Cell 0 with 70000 the BqStudio doesnt allow me since its outside of the allowed bounderis.

    Please help me understad how to update this values correctly.

    Regards,

    Shlomy

    Hardware engineer

    Elbit Systems - Land and C4I

  • in reply to Shlomy Sasson
    TI__Guru 73830 points

    Shlomy

    The gauge can support 29Ah, so you will need to use capacity scaling. I have an application note on the bq34z100-G1 website to help with high capacity packs.

    Tom

  • in reply to ThomasCosby
    Prodigy 90 points

    Tom,

    Thanks for the answer, the aplication note helped me.  
    now I have new problem:  while leaving the battery for rest the BQ34Z100-G1 resets its values and think that the battery SOC is 100%,
    For example:  The battery was 100%, I discharged it to 66%, I did let the battery rest and after about 40 minuts the gauge reseted its FCC,True RC and SOC value.

    The log for the test is attached here,  can you please help me understand whats causes the gauge to resets it's values?
    It happens in sample number 5762.

     afterOCVwhileDischarging.log

    Regards,
    Shlomy