BQ40Z80: BQ40Z80

Hey Dino,

Can you send me the gg file from the gauge?

Regards,

Nick Richards

learning_cycle_2024_06.gg.csv

Here is the gg file from the gauge
I have created it just now, so I am not completely sure, whether it gives you sufficient information, as the attempt for the learning cycle was 2 weeks ago.

Thank you anyways.

Regards,
Dino 

Hey Dino,

Thank you sending the gg file. Just for purposes of completing the learning cycle, I would recommend disabling the OC protection. You can disable it by setting the OC bit in Enabled Protections C to 0 in Data Memory.

Regards,

Nick Richards

Hello Nick,

I will try like this and keep logging during the process from next Monday.

If it does not work out again I will come back to you.

Thank you very much for your help.

Regards,
Dino

Hello Dino,

Sounds good. Keep me updated!

Regards,

Nick Richards

Hello Nick 

It somehow did not work properly after it charged fully.

The Full Charge was detected and [FC] bit was set.

But afterwards it did not work properly.

I will attach the .csv files from logging.

learning_cycle_2024_06_24.csvlearning_cycle_2024_06_25.csvlearning_cycle_2024_06_26.csv

Thanks in advande.

Best, Dino

Hello Dino,

I noticed towards the end of the final discharge that the RDIS bit gets set in the IT Status Register. This indicates to me that the ChemID that you are using was not matched correctly. How did you obtain the ChemID, did you use the GPCCHEM tool?

Regards,

Nick Richards

Hello Nick,

I used your online tool, where one can upload the .csv file. 
Gauging Parameter Calculator (GPC) Tool - Upload (ti.com)

I used this file for the ChemID: 5428.roomtemp_rel_dis_rel.csv

And I got this report: 

Chemistry ID selection tool, rev=2.54		
		
Configuration used in present fit:		
ProcessingType=2		
NumCellSeries=2		
ElapsedTimeColumn=0		
VoltageColumn=1		
CurrentColumn=2		
TemperatureColumn=3		
		
Best chemical ID : 105	Best chemical ID max. deviation, % : 2.17	
		
		
		
Summary of all IDs with max. DOD deviation below 3%		
		
Chem ID	max DOD error, %	Max R deviation, ratio
105	2.17	0.7
		
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, %
354	bq27411-G1C: 4.35V LiCoO2	2.95
128	bq27421-G1A: 4.2V LiCoO2	5.36
3142	bq27421-G1D: 4.4V LiCoO2	5.76
312	bq27421-G1B: 4.3V LiCoO2	9.48
Best generic ID 354		
Max. deviations for best generic ID is within recommended range. Please chose this ID in your device configuration or device family.		
		
		
Device / Family #2		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
354	bq27621:  (ALT_CHEM2) 4.35V LiCoO2	2.95
1202	bq27621: (default) 4.2V LiCoO2	4.03
1210	bq27621:  (ALT_CHEM1) 4.3V LiCoO2	4.17
Best generic ID 354		
Max. deviations for best generic ID is within recommended range. Please chose this ID in your device configuration or device family.		
		
		
Device / Family #3		
Generic Chem ID	Device/ Voltage/ Chemistry	max DOD error, %
3230	bq27426: (default) 4.35V LiCoO2	3.27
1202	bq27426: (ALT_CHEM1) 4.2V LiCoO2	4.03
3142	bq27426: (ALT-CHEM2) 4.4V LiCoO2	5.76
Best generic ID 3230		
Max. deviations for best generic ID is within recommended range. Please chose this ID in your device configuration or device family.		
		
		

Though, I was a little confused, as there are several batteries in your database with the Chemistry ID "0105" (which was recommended for my battery pack), so I am not totally sure, whether I have chosen the correct one or if that even makes a difference.

Thank you!

Regards,
Dino

Hey Dino, 

Thank you for sending that over, can you also send over the datasheet for the battery you are using?

The charge behavior is not what I expect it to look like, so I want to see the data sheet to make sure that the charging was done according to the specifications.

Regards,

Nick Richards

Hello Nick

We have two batteries from the company Jauch in series with the product number: LP103450JH

jauch_battery_LP103450JH.pdf

Regards,

Dino

Hello Dino,

Thank you for sending the datasheet for the battery you are using. It looks like the charging was done incorrectly according to the datasheet for the battery. The charging voltage of one battery is 4.2V so for two batteries in series the charging voltage should be 8.4V. According to the log you provided, the voltage only goes up to 8200mV. Please complete the test again, but make sure to constant current charge until 8.4V and then constant voltage charge.

Regards,

Nick Richards

Hello Nick,

we have a custom data sheet for our product: matd_246520_20200507_1900mah_-_lp103450jh_1s1p_2_wire_70mm adjusted temp. Range.pdf

The other thing I can think about which may be wrong is the current which was used for discharging and charging.

Regards,
Dino

Hello Dino,

I checked the custom datasheet you provided and that one also states that charging voltage is 4.2V. The discharge rate is fine. It is close to C/10 discharge rate.

Regards,

Nick Richards

Hello Nick,

I think you missed the annotation with the "*", where it says, that the charge voltage is changed to 4.1V.

So the only thing that remains regarding the charging conditions, that I can change is the charging current, as it was charged with 500mA and it is stated that max. charging current is 0.2C which would be 0.380mA.

Could this be the reason for a wrong chem-ID?

Regards,
Dino

Hello Dino,

The current that is used for charging the battery will not affect the results of the test. However, the 4.1V charging voltage is very unusual and I think this is the reason why the report is not getting a valid chemID. The report is not giving back a valid ChemID because we most likely have not characterized a battery similar to yours before. Therefore, I believe the next steps would be to get into contact with your local FAE and get those batteries you are using shipped into our lab to be characterized.

Regards,

Nick Richards

Hello Nick,

Thank you very much for your service so far.

Could you provide me with a link or a contact of a field application engineer?

We are stationed in Vienna, so shipping our battery within Europe would be nice if possible.

Regards,
Dino

Hello Dino,

I will send you a friend request. We will continue this discussion in private message.

Regards,

Nick Richards

Hello Nick,

I accepted.
Thank you.

Regards,
Dino

Hello Dino,

Thank you! Just sent you a private message.

Regards,

Nick Richards