• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 256 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.

Original question:

BQ40Z50-R2: Failed learning cycle at second relax, VOK never clear

BQ40Z50-R2: Failed learning cycle at second relax, VOK never clear on fv 5.03

Riley Beck
Prodigy 30 points
Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: GPCCHEM

I have the same issue as the related ticket, this time on firmware version 5.03. After the second relax (after full charge) an OCV reading is never taken and a Qmax update never occurs. I have attached data memory used for the learning cycle as well as logs. The logs are in 3 parts corresponding with their names.

Charge, Relax.loginit Discharge, Relax.logFirmware5 learning mem wCalib.gg.csvsec Discharge, Relax.log

  • 0
    TI__Mastermind 24931 points

    Hello Riley, 

    Can you please provide me with your GPCCHEM information (both the report and the raw data that was submitted). If the chemID you are using is not a good match, then the OCV could be disqualified and VOK will not set/clear as expected. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 30 points

    Hi Jonny,

    I no longer have access to the data used to generate the report as it wasn't conducted by me but I have attached the GPDCHEM report. If you believe this could be the issue I will attempt a new CHEMID process and reply with the results.

    Fullscreen 1050.GPC_report.txt Download 
    Chemistry ID selection tool, rev=2.5		
		
Configuration used in present fit:		
ProcessingType=2		
NumCellSeries=4		
ElapsedTimeColumn=0		
VoltageColumn=1		
TemperatureColumn=2		
CurrentColumn=3		
		
Best chemical ID : 414	Best chemical ID max. deviation, % : 10.84	
		
		
		
Summary of all IDs with max. DOD deviation below 15%		
		
Chem ID	max DOD error, %	Max R deviation, ratio
414	10.84	0.8
464	12.19	2.13
436	13.08	1.3
435	14.17	0.48
		
Max. deviations for best ID is within recommended range. Chosen best chemical ID is suitable for programming the gauge.		
		
		
Selection of best generic ID for ROM based devices like bq274xx		
		
		
Device / Family #1		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
3142	bq27421-G1D: 4.4V LiCoO2	4566.46
128	bq27421-G1A: 4.2V LiCoO2	4621.33
354	bq27411-G1C: 4.35V LiCoO2	4733.76
312	bq27421-G1B: 4.3V LiCoO2	11032.87
Best generic ID 3142		
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	4434.92
1202	bq27621: (default) 4.2V LiCoO2	4537.2
354	bq27621:  (ALT_CHEM2) 4.35V LiCoO2	4733.76
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, %
1202	bq27426: (ALT_CHEM1) 4.2V LiCoO2	4537.2
3142	bq27426: (ALT-CHEM2) 4.4V LiCoO2	4566.46
3230	bq27426: (default) 4.35V LiCoO2	5393.56
Best generic ID 1202		
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

  • 0 in reply to Riley Beck
    TI__Mastermind 24931 points

    Hello Riley, 

    It looks like the ChemID you are using has a large DOD error. Ideally you will want to pick a ChemID with a DOD error less than 3%. I recommend going through the ChemID selection process again. The CPCCHEM tool can be found here. 

    Regards, 

    Jonny.