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Is a bq34z100 learning cycle with an attached balancig system possible?

Fabian Grob
Prodigy 140 points

Hello


We have a LiFePo4 system with a 10s1p configuration and an attached passive balancing system. The balancing starts working as soon as a cell reaches 3.5V. The cut off voltage for the charger is 3.65V per cell. Now my question: is it at all possible to sucessfully complet a learning cycle if the balancers are attached to the cells during a learning cycle or do i have to remove the balancers for the learning cycle. If yes what will happen to the gauge if the balancers are attached during regular use? will the capacyty reading be accurate?


Best Regards

Fabian

  • 0
    TI__Guru 73830 points
    Fabian,
    We should clarify a couple of things to answer this question. We have the optimization cycle, where the gauge updates the Ra table and Qmax for a new pack. We also have learning cycles, where the Ra table and Qmax are updated in the field. Our devices, that include cell balancing, disable balancing during the optimization cycle. But, the optimization cycle should be run on cells that are well matched and are currently balanced. If it is the field learning cycle that you are referring to, then balancing does not have to be disabled during charging. But, if it is still active during rest, then it can prevent the cells from stabilizing to a level where a Qmax update is allowed. This could prevent an update after charge, but an update could occur after discharge since it sounds like your balancing circuit is inhibited when the voltage is below 3.5V. The Qmax calculation is based on the charge passed through the sense resistor, so charge removed from cells through balancing should not impact the value.
    Tom
  • 0 in reply to ThomasCosby
    Prodigy 140 points
    Tom
    Thaks for the quik respond. I get back to you if more questions come up.
    Fabian
  • 0 in reply to Fabian Grob
    Prodigy 140 points

    discharge LT1-13.logTom
    Now I have more questions. I could no see the FC bit going to high even the charging current came down below the taper curent level and the charge voltage was higher than the charge voltage. I would appreciate if you could have a look at my logging file and give me some suggestions on what is wrong.
    Fabian

  • 0 in reply to Fabian Grob
    TI__Guru 73830 points
    It looks like there may be a parameter setup problem. Can you export a .senc file and attach it to this message?
  • 0 in reply to ThomasCosby
    Prodigy 140 points

    LS1.zipTom
    I attached the senc as zip and also the gg
    Fabian


    Fullscreen LS1 initial 10 cell.gg.txt Download 
    [Header]
bq EVSW Version = 0.9.90	
DeviceName = bq34z100 v0.06
Time = 22.01.2015 14:08:27	


[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 = 370
Min Taper Capacity = 25
Cell Taper Voltage = 100
Current Taper Window = 40
TCA Set % = 99
TCA Clear % = 95
FC Set % = -1
FC Clear % = 98
DODatEOC Delta T = 10.0
[Data(Configuration)]
Rem Cap Alarm = 700
Initial Standby = -10
Initial MaxLoad = -500
Manuf Date = 01-Jan-1980
Ser. Num. = 0001
Cycle Count = 1
CC Threshold = 9000
Design Capacity = 11000
Design Energy = 32767
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 = 3200
Charge Current T1-T2 = 33
Charge Current T2-T3 = 33
Charge Current T3-T4 = 3
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 = 10
Device Name = bq34z100
Manufacturer Name = Esoro
Device Chemistry = LiFe
[Discharge(Configuration)]
SOC1 Set Threshold = 1000
SOC1 Clear Threshold = 1100
SOCF Set Threshold = 500
SOCF Clear Threshold = 600
Cell BL Set Volt Threshold = 2700
Cell BL Set Volt Time = 2
Cell BL Clear Volt Threshold = 2900
Cell BH Set Volt Threshold = 3700
Cell BH Volt Time = 2
Cell BH Clear Volt Threshold = 3600
[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 = 0000
[Lifetime Data(Configuration)]
Lifetime Max Temp = 34.0
Lifetime Min Temp = 18.0
Lifetime Max Chg Current = 3236
Lifetime Max Dsg Current = -1987
Lifetime Max Pack Voltage = 36670
Lifetime Min Pack Voltage = 28390
[Lifetime Temp Samples(Configuration)]
LT Flash Cnt = 166
[Registers(Configuration)]
Pack Configuration = 09E1
Pack Configuration B = BF
Pack Configuration C = 30
LED_Comm Configuration = 93
Alert Configuration = 0000
Number of series cell = 10
[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 = 2000
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 = 2900
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 = 25
Chg Current Threshold = 50
Quit Current = 20
Dsg Relax Time = 60
Chg Relax Time = 60
Quit Relax Time = 1
Cell Max IR Correct = 400
[State(Gas Gauging)]
Qmax Cell 0 = 1000
Cycle Count = 0
Update Status = 04
Cell V at Chg Term = 3656
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 = 0445

[R_a0(Ra Table)]
Cell0 R_a flag = FF55
Cell0 R_a 0 = 105
Cell0 R_a 1 = 100
Cell0 R_a 2 = 113
Cell0 R_a 3 = 143
Cell0 R_a 4 = 98
Cell0 R_a 5 = 97
Cell0 R_a 6 = 108
Cell0 R_a 7 = 89
Cell0 R_a 8 = 86
Cell0 R_a 9 = 85
Cell0 R_a 10 = 87
Cell0 R_a 11 = 90
Cell0 R_a 12 = 110
Cell0 R_a 13 = 647
Cell0 R_a 14 = 1500
[R_a0x(Ra Table)]
xCell0 R_a flag = FFFF
xCell0 R_a 0 = 105
xCell0 R_a 1 = 100
xCell0 R_a 2 = 113
xCell0 R_a 3 = 143
xCell0 R_a 4 = 98
xCell0 R_a 5 = 97
xCell0 R_a 6 = 108
xCell0 R_a 7 = 89
xCell0 R_a 8 = 86
xCell0 R_a 9 = 85
xCell0 R_a 10 = 87
xCell0 R_a 11 = 90
xCell0 R_a 12 = 110
xCell0 R_a 13 = 647
xCell0 R_a 14 = 1500

[Data(Calibration)]
CC Gain = 2.028
CC Delta = 2.024
CC Offset = -0.72
Board Offset = -0.72
Int Temp Offset = 0.0
Ext Temp Offset = 3.4
Voltage Divider = 52148
[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

  • 0 in reply to Fabian Grob
    TI__Guru 73830 points
    Fabian,
    I reviewed the .senc file and found that the chemistry has not been updated. It looks like you may have changed the ChemID number in the Data Flash screen to 0445, but this does not update the chemistry. You need to use the bqChem screen to program the chemistry into the device. A couple of other observation to mention are that you should set Qmax to the Design Capacity and I would allow more separation between the Quit current and Discharge current parameter settings. Maybe set the DSG current setting a little higher.
    Tom