• State
  • Locked Locked
  • Replies 12 replies
  • Subscribers 63 subscribers
  • Views 2972 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

bq34z100-G1: Assistance with Gauging Parameter Calculator

Paul Eccles
Prodigy 100 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ34Z100-G1, GASGAUGECHEM-SW, BQSTUDIO

GPC Support,

Attached is my submission to the GPC along with the report I received.  It says that “Best chemical ID : 6100        Best chemical ID max. deviation, % : 100” and that “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’m hoping to use these battery pack design (5 x FDK HR-DU cells in series) with the bq34z100-G1.

Should I proceed using the recommended chemical ID (6100) or is there a problem with my data that I should correct first?  If I proceed with 6100 do you believe the gauge will function properly?

Thank you,

Paul.FDK HR-DU submission 7.zipFDK HR-DU submission 7-report.zip

  • 0
    TI__Guru* 76230 points
    Hi Paul,
    No you can't use the chem id. The error is 100% which is more than the 3% required. In looking at the report, it says "Warning: difference between initial and final DOD is less than 90% dDOD_%= 88 Try to decrease the discharge rate"

    so it means you didn't have atleast 90% of the capacity of the battery discharged.

    I recommend charging the battery to the max voltage stated in the data sheet and discharging to the minimum voltage stated as well using less than c/10 discharge rate.

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 100 points

    Hello Onyx, thanks for your help.

    I didn't spot that warning in the report, that's helpful.

    I've tried again (this time with a smaller 3Ah pack) and made sure that the cells were fully charged and then FDK HR-DU submission 8.zipFDK HR-DU submission 8-report.zipheavily discharged (less than 0.7V/cell).  The max. deviation has now increased from 100% to 101.53% but this time there isn't a helpful warning at the bottom.

    Could you give me a clue as to where I'm still going wrong?  Files are attached.

    Thanks,

    Paul.

  • 0 in reply to Paul Eccles
    TI__Guru* 76230 points
    Hi Paul,
    What kind of cells are these? LFP? If they are not lithium ion phosphate cells, why are you charging to just 3.8V per cell? Also, your charge data doesn't have any tapering. You are charging to a particular voltage (7.375V) and abruptly cutting off charge. When charging your battery, it has to be with CC/CV ( constant current, then constant voltage) to allow the battery properly charge. Also, you are to charge to the voltage stated in the cell manufacturers data sheet and likewise for the discharge.

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 100 points

    Hello Onyx, thanks for the rapid response.

    These are NiMH cells with five in series, charged with a constant current. The charge is being terminated with the -dV/dt method: you can see the slight the voltage drop just before charging ceases.

    The cells are being charged and discharged as per the manufacturer's data.

    Thanks again,
    Paul.

  • 0 in reply to Paul Eccles
    TI__Guru* 76230 points
    Hi Paul,
    Thanks for the clarification. That makes sense. I have forwarded the data to our algorithm team as it appears the tool might be unable to handle NiMH data. Once i hear back i will let you know.

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 100 points

    Hello Onyx, any luck with this?  If not, is there a way to progress without using the GPS tool?

    Thanks,
    Paul.

  • 0 in reply to Paul Eccles
    TI__Guru* 76230 points

    Hi Paul,

    Sorry for the delayed response to this. Our algorithm team responded  but i couldn't find or remember your post to give the response. Thanks for writing back.

    I have attached the result that was returned after our algorithm team updated the tool.

    Note that with NiMH, NiCd and Lead Acid, we cannot expect 3% accuracy, 15% is more likely the expectation.

    Fullscreen 3404.GPC_report.txt Download 
    Chemistry ID selection tool, rev=2.25		
		
Configuration used in present fit:		
ProcessingType=2		
NumCellSeries=5		
ElapsedTimeColumn=0		
VoltageColumn=1		
CurrentColumn=2		
TemperatureColumn=3		
		
Best chemical ID : 6112	Best chemical ID max. deviation, % : 11.28	
		
		
		
Summary of all IDs with max. DOD deviation below 3%		
		
Chem ID	max DOD error, %	Max R deviation, ratio
0	0	0
		
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		
		
		
Selection of best generic ID for ROM based devices like bq274xx		
		
		
Device / Family #1		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
312	bq27421-G1B: 4.3V LiCoO2	100
354	bq27411-G1C: 4.35V LiCoO2	200
3142	bq27421-G1D: 4.4V LiCoO2	200
128	bq27421-G1A: 4.2V LiCoO2	200
Best generic ID 312		
Warning: Generic ID 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		
		
		
Device / Family #2		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
1210	bq27621:  (ALT_CHEM1) 4.3V LiCoO2	100
354	bq27621:  (ALT_CHEM2) 4.35V LiCoO2	200
1202	bq27621: (default) 4.2V LiCoO2	200
Best generic ID 1210		
Warning: Generic ID 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		
		
		
Device / Family #3		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
3230	bq27426: (default) 4.35V LiCoO2	100
3142	bq27426: (ALT-CHEM2) 4.4V LiCoO2	200
1202	bq27426: (ALT_CHEM1) 4.2V LiCoO2	200
Best generic ID 3230		
Warning: Generic ID 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

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 100 points

    Thank you Onyx.  If I re-submit my data I now get "Best chemical ID : 6112" too.

    I've just tried selecting this chemical ID in bqStudio version 1.3.54 but the highest ID number offered is 6108.  I've just tried to apply the latest GASGAUGECHEM-SW (sluc564dm.zip) but according to bqStudio "the zip file contains files older than the installed one".

    How can I get the data for Chem ID 6112?

    Thanks again,
    Paul.

  • 0 in reply to Paul Eccles
    TI__Guru* 76230 points

    Hi Paul
    Did you try this. it was last updated sept 07


    thanks
    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 100 points

    Hello Onyx,

    Yes, that is the file I mentioned: sluc564dm.zip

    The Help->Chemistry Updater error message is attached.  I've tried removing the the chemistry directory and replacing it with ChemistryUpdate.594.zip but when I next start Battery Management Studio no chemistries are listed.  Are there supposed to be two different chemistry updates within sluc564dm.zip?  Update 593 and 594 are included. Perhaps this is the problem?

  • 0 in reply to Paul Eccles
    Expert 2475 points
    Paul,
    Did you delete the chemistry directory and then use the ChemIstry Updater on the bqStudio Help pull-down to import sluc564dm.zip into the program? This should work.
  • 0 in reply to Paul Eccles
    TI__Guru* 76230 points

    Hi. 

    When you open the chem updater file you downloaded, copy the contects as show below and replace it in the same corresponding file of bqstudio.

    thanks

    Onyx