BQ34Z100 - bqEval Software - remaining capacity/full charge capacity error

Cris

Can you export a gg file from your pack so I can check the parameters?
Thanks

Tom

How do I export a gg file?

Thanks,

Cris

Cris

You can go to the Data Flash screen, press the Read All button, go to the File pull-down menu and export the gg file.

Regards
Tom

Thanks Tom, attached is the gg file. You will have to rename the extension to "gg". 

[Header]
bq EVSW Version = 0.9.90	
DeviceName = bq34z100 v0.06
Time = 7/31/2013 8:13:43 AM	


[Safety(Configuration)]
OT Chg = 55.0
OT Chg Time = 2
OT Chg Recovery = 50.0
OT Dsg = 60.0
OT Dsg Time = 2
OT Dsg Recovery = 55.0
[Charge Inhibit Cfg(Configuration)]
Chg Inhibit Temp Low = 0.0
Chg Inhibit Temp High = 45.0
Temp Hys = 5.0
[Charge(Configuration)]
Suspend Low Temp = -5.0
Suspend High Temp = 55.0
[Charge Termination(Configuration)]
Taper Current = 550
Min Taper Capacity = 25
Cell Taper Voltage = 100
Current Taper Window = 40
TCA Set % = 99
TCA Clear % = 95
FC Set % = 100
FC Clear % = 98
DODatEOC Delta T = 10.0
[Data(Configuration)]
Rem Cap Alarm = 100
Initial Standby = -10
Initial MaxLoad = -500
Manuf Date = 01-Jan-1980
Ser. Num. = 0001
Cycle Count = 0
CC Threshold = 9000
Design Capacity = 10000
Design Energy = 5400
SOH Load I = -400
TDD SOH Percent = 90
Cell Charge Voltage T1-T2 = 3600
Cell Charge Voltage T2-T3 = 3600
Cell Charge Voltage T3-T4 = 3600
Charge Current T1-T2 = 10
Charge Current T2-T3 = 50
Charge Current T3-T4 = 30
JEITA T1 = 0
JEITA T2 = 10
JEITA T3 = 45
JEITA T4 = 55
ISD Current = 10
ISD I Filter = 127
Min ISD Time = 7
Design Energy Scale = 1
Device Name = bq34z100
Manufacturer Name = Texas Inst.
Device Chemistry = LION
[Discharge(Configuration)]
SOC1 Set Threshold = 150
SOC1 Clear Threshold = 175
SOCF Set Threshold = 75
SOCF Clear Threshold = 100
Cell BL Set Volt Threshold = 1000
Cell BL Set Volt Time = 2
Cell BL Clear Volt Threshold = 1100
Cell BH Set Volt Threshold = 4000
Cell BH Volt Time = 2
Cell BH Clear Volt Threshold = 3900
[Manufacturer Data(Configuration)]
Pack Lot Code = 0000
PCB Lot Code = 0000
Firmware Version = 0000
Hardware Revision = 0000
Cell Revision = 0000
DF Config Version = 0000
[Integrity Data(Configuration)]
Static Chem DF Checksum = 6760
[Lifetime Data(Configuration)]
Lifetime Max Temp = 30.0
Lifetime Min Temp = 20.0
Lifetime Max Chg Current = 0
Lifetime Max Dsg Current = -714
Lifetime Max Pack Voltage = 3672
Lifetime Min Pack Voltage = 2551
[Lifetime Temp Samples(Configuration)]
LT Flash Cnt = 10
[Registers(Configuration)]
Pack Configuration = 0161
Pack Configuration B = FF
Pack Configuration C = 30
LED_Comm Configuration = 00
Alert Configuration = 0000
Number of series cell = 1
[Lifetime Resolution(Configuration)]
LT Temp Res = 1.0
LT Cur Res = 100
LT V Res = 25
LT Update Time = 60
[LED Display(Configuration)]
LED Hold Time = 4
[Power(Configuration)]
Flash Update OK Cell Volt = 2800
Sleep Current = 10
FS Wait = 0

[Manufacturer Info(System Data)]
Block A 0 = 00
Block A 1 = 00
Block A 2 = 00
Block A 3 = 00
Block A 4 = 00
Block A 5 = 00
Block A 6 = 00
Block A 7 = 00
Block A 8 = 00
Block A 9 = 00
Block A 10 = 00
Block A 11 = 00
Block A 12 = 00
Block A 13 = 00
Block A 14 = 00
Block A 15 = 00
Block A 16 = 00
Block A 17 = 00
Block A 18 = 00
Block A 19 = 00
Block A 20 = 00
Block A 21 = 00
Block A 22 = 00
Block A 23 = 00
Block A 24 = 00
Block A 25 = 00
Block A 26 = 00
Block A 27 = 00
Block A 28 = 00
Block A 29 = 00
Block A 30 = 00
Block A 31 = 00

[IT Cfg(Gas Gauging)]
Load Select = 1
Load Mode = 0
Max Res Factor = 15
Min Res Factor = 3
Ra Filter = 500
Fast Qmax Start DOD % = 92
Fast Qmax End DOD % = 96
Fast Qmax Start Volt Delta = 200
Cell Terminate Voltage = 2800
Cell Term V Delta = 50
ResRelax Time = 200
User Rate-mA = 0
User Rate-Pwr = 0
Reserve Cap-mAh = 0
Reserve Energy = 0
Max Scale Back Grid = 4
Cell Max DeltaV = 200
Cell Min DeltaV = 0
Max Sim Rate = 2
Min Sim Rate = 20
Ra Max Delta = 44
Qmax Max Delta % = 5
Cell DeltaV Max Delta = 10
Fast Scale Start SOC = 10
Charge Hys V Shift = 40
[Current Thresholds(Gas Gauging)]
Dsg Current Threshold = 60
Chg Current Threshold = 75
Quit Current = 40
Dsg Relax Time = 60
Chg Relax Time = 60
Quit Relax Time = 1
Cell Max IR Correct = 400
[State(Gas Gauging)]
Qmax Cell 0 = 10000
Cycle Count = 0
Update Status = 04
Cell V at Chg Term = 3500
Avg I Last Run = -299
Avg P Last Run = -1131
Cell Delta Voltage = 2
T Rise = 20
T Time Constant = 1000

[OCVa Table(OCV Table)]
Chem ID = 0415

[R_a0(Ra Table)]
Cell0 R_a flag = FF55
Cell0 R_a 0 = 17
Cell0 R_a 1 = 20
Cell0 R_a 2 = 27
Cell0 R_a 3 = 22
Cell0 R_a 4 = 21
Cell0 R_a 5 = 24
Cell0 R_a 6 = 24
Cell0 R_a 7 = 35
Cell0 R_a 8 = 45
Cell0 R_a 9 = 46
Cell0 R_a 10 = 50
Cell0 R_a 11 = 54
Cell0 R_a 12 = 61
Cell0 R_a 13 = 123
Cell0 R_a 14 = 3382
[R_a0x(Ra Table)]
xCell0 R_a flag = FFFF
xCell0 R_a 0 = 17
xCell0 R_a 1 = 20
xCell0 R_a 2 = 27
xCell0 R_a 3 = 22
xCell0 R_a 4 = 21
xCell0 R_a 5 = 24
xCell0 R_a 6 = 24
xCell0 R_a 7 = 35
xCell0 R_a 8 = 45
xCell0 R_a 9 = 46
xCell0 R_a 10 = 50
xCell0 R_a 11 = 54
xCell0 R_a 12 = 61
xCell0 R_a 13 = 123
xCell0 R_a 14 = 3382

[Data(Calibration)]
CC Gain = 10.124
CC Delta = 10.147
CC Offset = -0.71
Board Offset = 0
Int Temp Offset = 0.0
Ext Temp Offset = 0.0
Voltage Divider = 5000
[Current(Calibration)]
Deadband = 5

[Codes(Security)]
Sealed to Unsealed = 36720414
Unsealed to Full = FFFFFFFF
Authen Key3 = 01234567
Authen Key2 = 89ABCDEF
Authen Key1 = FEDCBA98
Authen Key0 = 76543210

Regards,

Cris

Cris,

I have reviewed your log file and gg file and have a few questions.

• Is the current calibrated to 1X? If so, there is a lot of drop in this cell for a discharge current that is less than 500mA . What discharge current do you plan to use in normal operation? Why is the current varying during the optimization cycle?
• Was the cell fully charged before starting the discharge? The FC bit is not set in the Flags register.
• I would set the Flash Update OK voltage to 2V for your setup.
• I would disable FConvEn in the Operation Configuration B register during the optimization cycle. 
• What happened at line 3415 in you log file? It looks like the device may have been reset.
• What is the part number for your cell and how did you select ChemID 415 for the setup?

Regards
Tom

Hi Tom,

1) I believe the current is calibrated to 1X yes. The current is varying because I connected one of our devices to it which varies in current draw from 140mA to 700mA depending on the state of the software.

2) The cell was fully charged before I started this test. The log file doesn't reflect that because I had to start and stop the log file since it did not save the previous file due to folder permission restrictions on Windows.

3) I'll change the Flash Update voltage to 2V.

4) I don't know what happened at line 3415, this seems to happen at random times. It happened twice yesterday, after which I get strange numbers in the remaining cap and full charge cap values. I was hoping you would be able to suggest something. Is it normal that if the device resets during discharge, the remaining cap and full charge cap value don't make any sense?

5) The part number is lfp-8790160-5c it is a 3.2V LiFePO4 10Ah battery from AA Portable Power Corp, below is the datasheet. ChemID 415 is LiFePO4 and the same Ah rating.

http://www.batteryspace.com/prod-specs/5309.pdf

Regards,

Cris

Cris

Part of the problem may be that the cell is not fully charged. This cell is supposed to be charged to 3.8V and the recommended charging current is 2A. I would charge it at 2A and reduce the Taper Current to 200mA. I would also verify that the ChemID matches the cell. You can run a charge/discharge profile and I can check it with a Mathcad program.

Here is the process to collect the data for my analysis.
 
• You will need to monitor the cell voltage, cell temperature, current and set the time to log every 1 second.
• Charge the pack to full and allow it to taper to a C/100 taper current.
• Let it rest for at least 4 hours, then discharge it at a C/10 rate to discharge complete.
• Let it rest for about 4 hours.
• Send the log file to me and I will run it on the Mathcad tool to search for a ChemID match.

Regards

Tom

Tom,

Can I use the Fuel Gauge for the cell voltage, cell temperature and current?

I'll charge the pack and allow it to taper to 100mA.

Thanks,

Cris

Cris,

Yes, you can monitor the cell voltage, temperature and current using the bqEVSW logging feature. Please attach a thermistor to the cell.

Tom

Tom,

The battery is at 88% of the charge, do you want me to discharge it first at C/10 then start your step by step process with charging/discharging?

I have a charger that I bought with the battery that is supposed to go up to 3A charging but according to the fuel cell it is only charging at 467mA. I also have a BQ24630 EVM but am having issues with that as well to get the constant current charge and voltage charge.

I have posted something 6 days ago but no one got back to me on how to fix that issue. I am experiencing the same problem on the EVM and my own design.

http://e2e.ti.com/support/power_management/battery_management/f/179/t/280412.aspx

I am getting another charger EVM from Linear today but I was hoping to get the TI charger working, not sure if you can help or know someone that can.

I don't have anyway to produce the proper data you need at the moment.

Cris

Cris,

You do not have to discharge the cell. You can charge it to full, let it rest for 4 hours. Then issue a reset (41) command and an IT Enable (21) command before you start the discharge.

Tom

Tom,

As soon as I get something that will charge the battery, I will post the log file.

Do you want me to turn on/off any other register settings?

Thanks,

Cris

I think that the other settings should be okay.

Hi Tom,

To what level do you want me to discharge the battery to?

Regards,

Cris

CF,

You need to discharge to the Cell Term Voltage.

Tom

CF/Tom,

I'm using this cell also.

Was a ChemID ever determined for it?

Thanks,

Tom

I deal with a lot of ChemID cases, so I am not sure whether Cris sent a cell in for characterization. I can check the database, if you have a part number. You can also collect discharge data and we can check with Mathcad.

Thanks. It's an AA Portable 8790160-5C, LiFePO4, 10Ah.

It does not look like that cell was submitted for characterization. If you are interested in submitting cells for characterization, then please provide an email address and I will contact you.