BQ34Z100-G1: SOC Jump (99% --> 0%, 0% --> 100%)

Hi Kagawa,

Is your RemainingCapacity and FullChargeCapacity always 0? I also noticed there are some parameters not filled in, did you remove them?

Best,

Jessica

HI Jessica-san,

Yes, RemainingCapacity and FullChargeCapcacity are always 0 after SOC jumped from 99% to 0%.

Which parameters ?

Regards,

Kagawa

Hi Jessica-san,

How about this ?

Regards,

Kagawa

Hi Jessica-san,

There is a information from customer as below.

I tried RESET.
The result remained unchanged at 0%.

Specifically, I did the following, and there was no change at 0%.
・ Check that it is 0% in bqStudio.
・ UNSEAL, and after sending the RESET command, refresh the screen.
・ bqStudio relaunched just in case
・ UNLEAL_FULL_ACCESS, RESET command transmission, screen refresh
・ bqStudio relaunched just in case

Regards,

Kagawa

Hi Kagawa-san,

Did your customer run a learning cycle on the gauge? Can you make sure they are using the correct chemID? If the RemainingCapacity and FullChargeCapacity are always 0, that means there is most likely something wrong with their configuration. 

Best,

Jessica

Hi Jessica-san,

Customer did run a learning cycle on the gauge. Customer was using the GPCCHEM tool and 641 was best.

Chemistry ID selection tool, rev=2.49		
		
Configuration used in present fit:		
ProcessingType=1		
NumCellSeries = 3		
ElapsedTimeColumn = 0		
VoltageColumn = 1		
CurrentColumn = 2		
TemperatureColumn = 3		
		
Best chemical ID : 641	Best chemical ID max. deviation, % : 4.49	
		
		
		
Summary of all IDs with max. DOD deviation below 15%		
		
Chem ID	max DOD error, %	Max R deviation, ratio
641	4.49	0.5
644	5.9	0.43
643	7.36	1.2
6112	7.54	1.3
6111	7.84	-113.94
6116	8.17	11.71
6117	8.23	6.44
6120	8.96	0.39
6108	9.67	-113.94
6119	11.01	1.04
6103	11.67	-49.88
6121	11.86	-45.6
6107	14.04	-121.03
		
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	100
354	bq27411-G1C: 4.35V LiCoO2	100
312	bq27421-G1B: 4.3V LiCoO2	200
128	bq27421-G1A: 4.2V LiCoO2	200
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	100
354	bq27621:  (ALT_CHEM2) 4.35V LiCoO2	100
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	100
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		
		
		
Warning - missing or corrupt parameter in config file: ProcessingType Default value 1 will be used		

regards,

Kagawa

Kagawa,

Please confirm you are using a NiMH type cell chemistry? This type of chemID has unique challenges mainly in the charge direction. Please make sure you are correctly getting a VCT event. 

1) The reason for the Jump to 100% is because FCC is going to 0mAh so 0RemCap/0Fcc is resulting in 100% RSOC. This will happen if Charge termination is learned low or resistance is learned too high whcih has the gauge simulate to FCC=0 right away. 

2) What do you mean by PowerOn? Do you mean you are starting the load? 

Thanks,

Eric Vos

Hi Eric-san,

This is a comment from customer.

SOC and FCC were calculated by resetting the Ra Table and Cell V at Chg Term of DataFlash to the initial values.
When only the Ra Table of DataFlash was returned to the initial value, SOC = 0%.

The following are the initial values ​​of DataFlash and the values ​​of NG products.
Battery is NiMH (4cell).
Can you find out the cause of the SOC jump from these data?

Cycle Count               Default:    0 , NG: 23
Lifetime Max Temp         Default: 25.5 , NG: 54
Lifetime Min Temp         Default: 25.0 , NG: -39.1
Lifetime Max Chg Current  Default:    0 , NG: 1623
Lifetime Max Dsg Current  Default:    0 , NG: -1028
Lifetime Max Pack Voltage Default:  187 , NG: 297
Lifetime Min Pack Voltage Default:  187 , NG: 158
LT Flash Cnt              Default:    0 , NG: 34

Cell V at Chg Term        Default: 1503 , NG: 1390
Avg I Last Run            Default: -464 , NG: -442
Avg P Last Run            Default: -582 , NG: -557
Cell Delta Voltage        Default:    1 , NG: 4

Ra Table (R_a0_14)        Default:11873 , NG: 20112
CC Offset                 Default: -1483, NG: -1466

Regards,

Kagawa

Hello C P van Teylingen-san,

Thank you for your information.

Eric-san,

Is this condition valid for all NiMH ?
Is there a way to determine this?

Regards,

Kagawa

Hello Kagawa-san,

You should confirm that the values stated above are correct (their respective C rating) otherwise the gauge will not know if it's charging, discharging, or if it can enter relaxed state.

Sincerely,

Wyatt Keller