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bq40z60 Learning Cycle hangs

Jim OSullivan
Intellectual 375 points
Other Parts Discussed in Thread: BQ40Z60, BQSTUDIO, GPCCHEM

I'm using a bq40z60 in a circuit based on the EVM, and using bqStudio to run a manual Learning Cycle.  Started off with a discharge cycle to the Termination Voltage.  It seems to have hung there.  The Cycle State is "Discharge Mode", the Relax Time is 00:00:00, and the Elapsed Time is past 26 hours.

Thu Apr 21 14:25:22 PDT 2016: Learning cycle started...
Thu Apr 21 14:25:22 PDT 2016: Start task: Discharge ( TerminateVoltage = 3300 mV )

What needs to happen for the Learning Cycle to proceed to the next step?

Thanks.

  • 0
    TI__Guru 73830 points
    Jim
    Please send the log file and I will check it.

    Tom
  • 0 in reply to ThomasCosby
    Intellectual 375 points

    Hi Thomas,

    Attached is the log file.

    Thanks.

    weekend_short.log

  • 0 in reply to Jim OSullivan
    TI__Guru 73830 points
    There is only a 73% change in DOD during the discharge. The optimization cycle requires at least 90%, so you will need to discharge to a lower Termination voltage. Have you verified that the ChemID match is good?
  • 0 in reply to ThomasCosby
    Intellectual 375 points

    Thanks Thomas.  What's the best way to get a ChemID for the battery I'm using?  I wasn't able to get the bqStudio logs to work with the online GPC tool.

    The battery is a 3S 450mAh LiPo.

    Thanks.

  • 0 in reply to Jim OSullivan
    TI__Guru 73830 points
    JIm
    Attach the logs to this posting and I will try it.
    Tom
  • 0 in reply to ThomasCosby
    Intellectual 375 points

    Attached is a log that includes a discharge cycle.

    Thank you.

    Tuesday_log_discharge.log

  • 0 in reply to Jim OSullivan
    TI__Guru 73830 points

    Jim

    Here are the GPCCHEM resutls.

    Tom

    Fullscreen 6204.GPC_report.txt Download 
    Chemistry ID selection tool, rev=2.13		
		
Configuration used in present fit:		
ProcessingType=2		
NumCellSeries=3		
ElapsedTimeColumn=0		
VoltageColumn=2		
CurrentColumn=3		
TemperatureColumn=1		
		
Best chemical ID : 380	Best chemical ID max. deviation, % : 0.85	
		
		
		
Summary of all IDs with max. DOD deviation below 3%		
		
Chem ID	max DOD error, %	Max R deviation, ratio
380	0.85	1.06
3220	0.86	1.81
3366	0.87	1.45
1198	0.87	1.91
363	0.91	1.89
3603	0.94	0.97
3276	0.95	1.96
3223	0.98	0.83
1225	1	0.9
3595	1	1.14
3501	1.01	1.57
3561	1.02	1.27
3611	1.03	1.69
3625	1.04	1.73
3662	1.04	1.14
3571	1.04	1.09
3505	1.07	1.39
3109	1.07	1.29
3260	1.08	1.94
1199	1.08	0.68
3185	1.08	1.06
3564	1.09	1.72
3107	1.1	0.89
3542	1.1	0.99
3465	1.1	0.99
3618	1.12	1.72
3647	1.13	1.66
3566	1.13	1.67
3728	1.14	1.65
3336	1.15	1.62
3665	1.16	1.83
3392	1.16	1.1
3243	1.16	1.38
3350	1.18	1.59
3494	1.18	1.56
3632	1.19	1.53
3451	1.19	1.21
3696	1.21	1.33
3532	1.21	0.92
3559	1.21	1.19
3150	1.22	0.73
3539	1.23	0.8
3646	1.24	0.73
3572	1.25	1.09
3224	1.26	1.72
3693	1.26	1.54
3209	1.27	1.18
3479	1.27	1.01
3172	1.28	0.93
3420	1.28	1.39
3436	1.29	1.4
3640	1.3	1.8
3515	1.32	1.32
3584	1.35	0.97
3615	1.35	1.32
3281	1.35	0.77
3663	1.37	1.76
3685	1.39	0.16
3683	1.42	0.72
3452	1.43	0.33
3538	1.44	1.12
3585	1.46	0.98
3709	1.47	0.09
3664	1.47	1.28
3296	1.48	0.96
3642	1.48	0.72
3535	1.49	0.45
3644	1.51	0.37
3482	1.53	0.53
3695	1.53	1.67
3586	1.54	1.8
3570	1.55	0.4
3239	1.56	1.9
3480	1.57	0.46
3616	1.57	0.62
3580	1.59	0.14
3464	1.6	1.6
1206	1.61	1.17
3488	1.62	0.92
3254	1.63	1.42
3473	1.64	2
3573	1.72	0.07
3556	1.72	0.24
3668	1.73	1.54
3351	1.77	1.53
3329	1.79	1.81
3487	1.79	1.28
3463	1.8	1.74
3694	1.83	1.24
3697	1.83	1.26
3700	1.83	1.55
3557	1.91	1.49
3343	1.91	1.71
3502	1.92	1.34
3631	1.94	1.5
3122	1.94	1.65
3675	1.96	0.02
3446	1.97	1.78
3354	1.98	1.74
3527	1.98	1.45
3216	2.02	1.44
3214	2.03	1.86
3604	2.04	1.64
3466	2.05	1.09
3467	2.06	1.09
3418	2.07	1.59
3658	2.12	0.73
3439	2.12	1.23
3301	2.17	1.36
3417	2.18	0.96
3197	2.22	0.01
3461	2.22	1.7
3493	2.28	1.02
3507	2.36	1.28
3402	2.38	1.5
3562	2.38	1.88
3430	2.39	0.23
3365	2.41	1.8
3525	2.44	1.61
3347	2.5	1.66
3422	2.56	2
3701	2.65	1.96
		
Max. deviations for best ID is within recomended range. Chosen best chemical ID is suitable for programming the gauge.

  • 0 in reply to Jim OSullivan
    Intellectual 375 points

    Hi Tom,

    I think we're almost there.  The gauging is a lot more accurate.  However, while doing an optimization cycle, the device status won't increment to 6 after the latest discharge.  VOK and RDIS are cleared, REST is set, FD & TD are set.  RA Updates seem to be disabled also.

    Attached are the SREC and discharge log.  We'd appreciate some help figuring this out.

    Thanks.

    Thursday.zip

  • 0 in reply to Jim OSullivan
    TI__Guru 73830 points
    Jim
    The discharge current dropped below a C/10 rate, so the Ra updates were disqualified. I used a Mathcad program to calculate the Ra table, but the results are questionable because the log file did not have charge data. Could you run a charge, rest, discharge and rest profile and log during the entire process? Discharge at a C/5 rate to insure that the Ra table update does not get disqualified.
    Tom
  • 0 in reply to ThomasCosby
    Intellectual 375 points

    Tom,

    I discharged at a rate just under C/5 and still didn't get an RA update - log is attached.  Does anything stand out?

    I'll run the cycle you requested next.

    Thank you.

    Thurs_disch_log_5C.zip

  • 0 in reply to Jim OSullivan
    Intellectual 375 points

    Hi Tom,

    Attached is the full charge-relax-discharge-relax cycle log.

    Thanks for your help.

    Jim

    chg_rest_dschg_rest.zip