AUX file generation problem for bq78pl116

Maciek,

Could you attach your log file and I will review it and try to get the aux file to complete?

Thanks

Tom

Tom,

Attached are the files for the data log, and the current pack parameters for reference. I didn't realize in the first post that you could not upload .csv files. Please let me know if you need any other information. 

Thanks,

Maciek

5226.battery aux generation test_run 3.xlsx1222.battery pack parameters_latest pre-golden file_rev 2.xlsx

Maciek,

The aux file generator does not like your charge and discharge currents. I received a message that the first discharge current must be at least 100mA. I found that the aux file would generate, if I changed the discharge currents to -150mA and the 10 charge pulses to 150mA. I also tried 100mA, but received a divide by zero error report. You will need to rerun the profile using higher currents. The cell voltages are not tracking very well, but they are close enough that the tool did not abort.

Regards

Tom

Tom,

The board design is using a 1mOhm sense resistor, so current readings in the log are scaled by a factor of 10 (not sure why it is scaled in to log though, since bqWizard is seeing correct current). The actual discharge current is set at 750mA, pulse charge also at 750mA, and full charge at 1050mA, so I can't really increase those rates very much. Would it work if we just added a 0 to all the current readings in the log to make up for the scaling?

Thanks,

Maciek

Maciek

Adding a 0 to the data will not yield good results. Why are you using a 1 mohm resistor and an IPScale of 10. I would use a 10 mohm resistor and an IPScale of 1 for those current levels. You will have better results.

Tom

Tom,

We used a 1mohm resistor to minimize voltage drop during discharge. We are pulling upwards of 30A from the battery, so with 10 mohms, the drop would be pretty noticeable. 

Going back to your earlier point, so if I were to rerun the test with slightly higher currents, say 1100mA for discharge, 1200mA for charge, you think the aux file generation utility should work?

Maciek

Maciek,

That should work. You can send me the log file, if ou have a problem.

Tom

Tom,

I re-ran the learning cycle over the weekend using th ehigher current settings, but still got some errors with the aux file utility. The log file is attached. This test did run over the whole weekned, so there is quite a bit of rest data at the end, not sure if that has any impact on aux file generation. The one consistant error that is see is that it reports current being off by 90%, so it seems like it is not understanding the scaling factor. Is there a way around this?

-Maciek

6558.battery aux generation test_run 5.xlsx

Maciek,

I found that there was an abnormal discharge current at the beginning of the second discharge cycle. I deleted it and the aux file was created. the reported current error should be okay. I attached the corrected .csv file, so that you can rerun the aux file program. Let me know if you have problems and I can attach the aux file that I ran.

Tom

Tom,

The file worked, thank you. I ran the aux program twice, once after putting 1150 (mA) in the first discharge current window of the program, the second by putting 115 (in scaled mA) in the window. Both worked, so would it be better to use the second file (one with the scaled current), or should I stick with the actual setting of 1150mA?

  -Maciek

You should input the scaled current, if that is what the aux file tool will find in the data.

Tom,

I was able to upload the aux data and extract the golden .dat file successfully. The fuel gauge looks to be accurate. Thank you very much for your help. I will update if any issues pop up after some testing.

-Maciek

Hello Mr. Cosby,

I'm currently trying to generate an auxiliary file as Maciek did, and got a error with the aux chem file utility.

Here is the error reported by the software :

Compiling profile of data file
Processing cycle : 1
Initial Discharge Complete
Charge Complete
Second Discharge Started
Second Discharge Complete
Unknown error
undefined method `abs' for nil:NilClass
Position =

I was wondering if you could try to generate the aux file.

Regards,

...

Chemistry File: 0400.chem

Number of series cells in log file: 5

Number of parallel cells in log file: 2

Fisrt Discharge (mA): 12000

acquisition - 20150210.zip

I made a new sequence to generate the Aux. File and I get a new kind of error :

There were one or more problems:
impedances Could not calculate 75 impedances

====================================
There was a problem found:
AuxGen could not calculate all impedance values needed
Please contact TI support for assistance

This is a fatal error and no .aux file will be generated

Here the new raw data file :

acquisition_2015-02-16.zip

Thanks