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BQ20Z95: BQ20Z95 and 3S2P NCR18650B

Artin Pirouzram
Prodigy 70 points

Part Number: BQ20Z95

Hello,

I have bought 3S2P battery packs from a supplier, it contains BQ20Z95 with Panasonic NCR18650B cells. Everything works fine except that the remaining capacity, is not at all the reality. Sometimes 12% when it is fully charged and sometimes shows 100% when there is only 10.5V left in the battery. I have charged and disscharged the battery pack, with the 1A, several times but the result is the same. I wonder if there is any parameter I can change to fix it. Battery manufacturer does not seem to solve the problem right now.

Artin

  • 0
    TI__Intellectual 1735 points
    • Hi,
    • You can use EV software and EV2300 to read the data memory from the gauge and see what is wrong.
    • The settings in the gauge can also be changed using EV software.
  • 0 in reply to answer
    Prodigy 70 points

    Hello Terry-Chen,

    Thanks for quick reply!

    Yes, I have EV2300. Here is the log of a battery, charged up and discharged with 1A a few times and finally it has been discharged at approximately 280mA down to 10.3V. As you can see there are still 100% charge remaining. Unfortunately, I'm not familiar with Fuel gauge parameters and settings, and therefore need help to rectify this problem with the help of you.

    Artin

  • 0 in reply to Artin Pirouzram
    TI__Intellectual 1735 points
  • 0 in reply to answer
    Prodigy 70 points
    Hello Terry_Chen,
    I changed chem ID from LION to 2012, discharged battery with 1A until the SOC has been turned off, waited about 5 hours, ran IT_Enable command, type 0021 in the command window and then 41 in the Manufacturer access. R_DIS became low (red), VOK became High (green) but QEN became high for a short time (less than one second) but turned low (red) again. I charged the battery with 1A until the SOC stopped charging. Now UPDATE_STATUS still 06 initially. Relative state of charge is 100% but the Absolute state of charge is 17%. I waited more than 5 hours and charged the battery with 1A until the SOC turned off. UPDATE_STATUS still 06 and both the state of the charge is 0%. I suspect that I failed to perform the learning process because QEN never became high. What do you think I can do next?
  • 0 in reply to Artin Pirouzram
    TI__Intellectual 1735 points

    • Hi,
    • You can export a gg file and and upload on the website, I will see the log data and find what is going wrong.
    • Thanks!

  • 0 in reply to answer
    Prodigy 70 points
    Hello Terry_Chen,
    I tried to upload a gg file here but unfortunately did not succeed. Is there another option to send the file to you?

    Best regards
    Artin
  • 0 in reply to Artin Pirouzram
    Prodigy 70 points

    Fullscreen NCR18650B_T4.gg.txt Download 
    [Header]
bq EVSW Version = 0.9.59	
DeviceName = bq20z95 v1.50
Time = 2017-03-20 10:26:53	


[Voltage(1st Level Safety)]
COV Threshold = 4250
COV Time = 2
COV Recovery = 4150
COV Delta = 20
COV Temp. Hys = 10.0
POV Threshold = 12900
POV Time = 2
POV Recovery = 12500
CUV Threshold = 2500
CUV Time = 2
CUV Recovery = 3000
PUV Threshold = 10000
PUV Time = 2
PUV Recovery = 12000
[Current(1st Level Safety)]
OC (1st Tier) Chg = 4250
OC (1st Tier) Chg Time = 2
OC Chg Recovery = 200
OC (1st Tier) Dsg = 12000
OC (1st Tier) Dsg Time = 2
OC Dsg Recovery = 200
OC (2nd Tier) Chg = 6000
OC (2nd Tier) Chg Time = 1
OC (2nd Tier) Dsg = 15000
OC (2nd Tier) Dsg Time = 1
Current Recovery Time = 70
AFE OC Dsg = 0A
AFE OC Dsg Time = 0F
AFE OC Dsg Recovery = 8
AFE SC Chg Cfg = 71
AFE SC Dsg Cfg = 74
AFE SC Recovery = 1
[Temperature(1st Level Safety)]
Over Temp Chg = 54.0
OT Chg Time = 2
OT Chg Recovery = 45.0
Over Temp Dsg = 75.0
OT Dsg Time = 2
OT Dsg Recovery = 65.0
[Host Comm(1st Level Safety)]
Host Watchdog Timeout = 0

[Voltage(2nd Level Safety)]
SOV Threshold = 17800
SOV Time = 3
Cell Imbalance Current = 5
Cell Imbalance Fail Voltage = 1000
Cell Imbalance Time = 0
Battery Rest Time = 1800
Min CIM-check voltage = 3000
PFIN Detect Time = 0
[Current(2nd Level Safety)]
SOC Chg = 10000
SOC Chg Time = 0
SOC Dsg = 10000
SOC Dsg Time = 0
[Temperature(2nd Level Safety)]
SOT Chg = 65.0
SOT Chg Time = 0
SOT Dsg = 85.0
SOT Dsg Time = 3
Open Thermistor = -33.3
Open Time = 0
[FET Verification(2nd Level Safety)]
FET Fail Limit = 20
FET Fail Time = 0
[AFE Verification(2nd Level Safety)]
AFE Check Time = 0
AFE Fail Limit = 10
AFE Fail Recovery Time = 20
AFE Init Retry Limit = 2
AFE Init Limit = 20
[Fuse Verification(2nd Level Safety)]
Fuse Fail Limit = 2
Fuse Fail Time = 0

[Charge Inhibit Cfg(Charge Control)]
Chg Inhibit Temp Low = 0.0
Chg Inhibit Temp High = 45.0
Temp Hys = 1.0
[Pre-Charge Cfg(Charge Control)]
Pre-chg Current = 660
Pre-chg Temp = 12.0
Pre-chg Voltage = 3000
Recovery Voltage = 3100
[Fast Charge Cfg(Charge Control)]
Fast Charge Current = 4000
Charging Voltage = 16800
Delta Temp = 5.0
Suspend Low Temp = -5.0
Suspend High Temp = 55.0
[Pulse Charge Cfg(Charge Control)]
Turn ON Voltage = 4150
Turn OFF Voltage = 4250
Max ON Pulse Time = 60.00
Min OFF Pulse Time = 0.00
Max OFF Voltage = 4270
[Termination Cfg.(Charge Control)]
Maintenance Current = 0
Taper Current = 330
Taper Voltage = 300
Current Taper Window = 40
TCA Set % = -1
TCA Clear % = 95
FC Set % = -1
FC Clear % = 95
[Cell Balancing Cfg(Charge Control)]
Min Cell Deviation = 1750
[Charging Faults(Charge Control)]
Over Charging Voltage = 500
Over Charging Volt Time = 2
Over Charging Current = 500
Over Charging Curr Time = 2
Over Charging Curr Recov = 100
Depleted Voltage = 8000
Depleted Voltage Time = 2
Depleted Recovery = 8500
Over Charge Capacity = 300
Over Charge Recovery = 2
FC-MTO = 50400
PC-MTO = 3600
Charge Fault Cfg = 00

[Data(SBS Configuration)]
Rem Cap Alarm = 660
Rem Energy Alarm = 9500
Rem Time Alarm = 10
Init Battery Mode = 0081
Design Voltage = 10800
Spec Info = 0031
Manuf Date = 06-nov-2016
Ser. Num. = 0001
Cycle Count = 2
CC Threshold = 5760
CC % = 90
CF MaxError Limit = 100
Design Capacity = 6400
Design Energy = 69120
Manuf Name = FORSEE
Device Name = O2Cncpt
Device Chemistry = 2012
[Configuration(SBS Configuration)]
TDA Set % = 0
TDA Clear % = 1
FD Set % = 0
FD Clear % = 20
TDA Set Volt Threshold = 5000
TDA Set Volt Time = 5
TDA Clear Volt = 5500
FD Set Volt Threshold = 5000
FD Volt Time = 5
FD Clear Volt = 5500

[Manufacturer Data(System Data)]
Pack Lot Code = 0000
PCB Lot Code = 0000
Firmware Version = A41B
Hardware Revision = 0000
Cell Revision = 0000
[Manufacturer Info(System Data)]
Manuf. Info = FORSEE
[Lifetime Data(System Data)]
Lifetime Max Temp = 46.2
Lifetime Min Temp = 9.3
Lifetime Max Cell Voltage = 4251
Lifetime Min Cell Voltage = 0
Lifetime Max Pack Voltage = 16027
Lifetime Min Pack Voltage = 9986
Lifetime Max Chg Current = 2167
Lifetime Max Dsg Current = -3457
Lifetime Max Chg Power = 25420
Lifetime Max Dsg Power = -36610
Life Max AvgDsg Cur = -1318
Life Max AvgDsg Pow = -1931
Lifetime Avg Temp = 19.9
[Lifetime Temp Samples(System Data)]
LT Temp Samples = 12789

[Registers(Configuration)]
Operation Cfg A = 4A29
Operation Cfg B = 6C4F
Operation Cfg C = 0004
Permanent Fail Cfg = 0008
Non-Removable Cfg = 0000
[AFE(Configuration)]
AFE.State_CTL = 00

[LED Cfg(LED Support)]
LED Flash Rate = 2.000
LED Blink Rate = 1.000
LED Delay = 48.8
LED Hold Time = 4
CHG Flash Alarm = 10
CHG Thresh 1 = 10
CHG Thresh 2 = 25
CHG Thresh 3 = 50
CHG Thresh 4 = 75
CHG Thresh 5 = 100
DSG Flash Alarm = 10
DSG Thresh 1 = 10
DSG Thresh 2 = 25
DSG Thresh 3 = 50
DSG Thresh 4 = 75
DSG Thresh 5 = 100
Sink Current = 3

[Power(Power)]
Flash Update OK Voltage = 7500
Shutdown Voltage = 7000
Shutdown Time = 10
Cell Shutdown Voltage = 2300
Cell Shutdown Time = 10
Charger Present = 15000
Sleep Current = 10
Bus Low Time = 5
Cal Inhibit Temp Low = 5.0
Cal Inhibit Temp High = 45.0
Sleep Voltage Time = 5
Sleep Current Time = 20
Wake Current Reg = 00

[IT Cfg(Gas Gauging)]
Load Select = 3
Load Mode = 1
Term Voltage = 12000
User Rate-mA = 0
User Rate-mW = 0
Reserve Cap-mAh = 0
Reserve Cap-mWh = 0
[Current Thresholds(Gas Gauging)]
Dsg Current Threshold = 100
Chg Current Threshold = 50
Quit Current = 10
Dsg Relax Time = 1
Chg Relax Time = 60
[State(Gas Gauging)]
Qmax Cell 0 = 6695
Qmax Cell 1 = 6675
Qmax Cell 2 = 6683
Qmax Cell 3 = 6400
Qmax Pack = 6675
Update Status = 06
Avg I Last Run = -1040
Avg P Last Run = -1154
Delta Voltage = 2

[R_a0(Ra Table)]
Cell0 R_a flag = 0000
Cell0 R_a 0 = 162
Cell0 R_a 1 = 114
Cell0 R_a 2 = 146
Cell0 R_a 3 = 173
Cell0 R_a 4 = 162
Cell0 R_a 5 = 114
Cell0 R_a 6 = 137
Cell0 R_a 7 = 246
Cell0 R_a 8 = 275
Cell0 R_a 9 = 418
Cell0 R_a 10 = 718
Cell0 R_a 11 = 1319
Cell0 R_a 12 = 1727
Cell0 R_a 13 = 1907
Cell0 R_a 14 = 1999
[R_a1(Ra Table)]
Cell1 R_a flag = 0000
Cell1 R_a 0 = 155
Cell1 R_a 1 = 108
Cell1 R_a 2 = 139
Cell1 R_a 3 = 165
Cell1 R_a 4 = 155
Cell1 R_a 5 = 107
Cell1 R_a 6 = 131
Cell1 R_a 7 = 236
Cell1 R_a 8 = 263
Cell1 R_a 9 = 401
Cell1 R_a 10 = 688
Cell1 R_a 11 = 1263
Cell1 R_a 12 = 1650
Cell1 R_a 13 = 1827
Cell1 R_a 14 = 1911
[R_a2(Ra Table)]
Cell2 R_a flag = 0000
Cell2 R_a 0 = 157
Cell2 R_a 1 = 110
Cell2 R_a 2 = 141
Cell2 R_a 3 = 169
Cell2 R_a 4 = 158
Cell2 R_a 5 = 109
Cell2 R_a 6 = 131
Cell2 R_a 7 = 225
Cell2 R_a 8 = 253
Cell2 R_a 9 = 376
Cell2 R_a 10 = 652
Cell2 R_a 11 = 1197
Cell2 R_a 12 = 1563
Cell2 R_a 13 = 1734
Cell2 R_a 14 = 1814
[R_a3(Ra Table)]
Cell3 R_a flag = FF55
Cell3 R_a 0 = 234
Cell3 R_a 1 = 164
Cell3 R_a 2 = 168
Cell3 R_a 3 = 221
Cell3 R_a 4 = 218
Cell3 R_a 5 = 138
Cell3 R_a 6 = 139
Cell3 R_a 7 = 210
Cell3 R_a 8 = 219
Cell3 R_a 9 = 314
Cell3 R_a 10 = 539
Cell3 R_a 11 = 991
Cell3 R_a 12 = 1298
Cell3 R_a 13 = 1434
Cell3 R_a 14 = 1501
[R_a0x(Ra Table)]
xCell0 R_a flag = 0055
xCell0 R_a 0 = 162
xCell0 R_a 1 = 114
xCell0 R_a 2 = 146
xCell0 R_a 3 = 173
xCell0 R_a 4 = 162
xCell0 R_a 5 = 114
xCell0 R_a 6 = 137
xCell0 R_a 7 = 254
xCell0 R_a 8 = 284
xCell0 R_a 9 = 432
xCell0 R_a 10 = 741
xCell0 R_a 11 = 1362
xCell0 R_a 12 = 1783
xCell0 R_a 13 = 1969
xCell0 R_a 14 = 2064
[R_a1x(Ra Table)]
xCell1 R_a flag = 0055
xCell1 R_a 0 = 155
xCell1 R_a 1 = 108
xCell1 R_a 2 = 139
xCell1 R_a 3 = 165
xCell1 R_a 4 = 155
xCell1 R_a 5 = 107
xCell1 R_a 6 = 131
xCell1 R_a 7 = 243
xCell1 R_a 8 = 271
xCell1 R_a 9 = 413
xCell1 R_a 10 = 708
xCell1 R_a 11 = 1300
xCell1 R_a 12 = 1699
xCell1 R_a 13 = 1881
xCell1 R_a 14 = 1968
[R_a2x(Ra Table)]
xCell2 R_a flag = 0055
xCell2 R_a 0 = 157
xCell2 R_a 1 = 110
xCell2 R_a 2 = 141
xCell2 R_a 3 = 169
xCell2 R_a 4 = 158
xCell2 R_a 5 = 109
xCell2 R_a 6 = 131
xCell2 R_a 7 = 243
xCell2 R_a 8 = 273
xCell2 R_a 9 = 406
xCell2 R_a 10 = 704
xCell2 R_a 11 = 1293
xCell2 R_a 12 = 1688
xCell2 R_a 13 = 1873
xCell2 R_a 14 = 1959
[R_a3x(Ra Table)]
xCell3 R_a flag = FFFF
xCell3 R_a 0 = 234
xCell3 R_a 1 = 164
xCell3 R_a 2 = 168
xCell3 R_a 3 = 221
xCell3 R_a 4 = 218
xCell3 R_a 5 = 138
xCell3 R_a 6 = 139
xCell3 R_a 7 = 210
xCell3 R_a 8 = 219
xCell3 R_a 9 = 314
xCell3 R_a 10 = 539
xCell3 R_a 11 = 991
xCell3 R_a 12 = 1298
xCell3 R_a 13 = 1434
xCell3 R_a 14 = 1501

[Device Status Data(PF Status)]
PF Flags 1 = 0000
Fuse Flag = 00
PF Voltage = 0
PF C4 Voltage = 0
PF C3 Voltage = 0
PF C2 Voltage = 0
PF C1 Voltage = 0
PF Current = 0
PF Temperature = 0.0
PF Batt Stat = 00
PF RC-mAh = 0
PF RC-10mWh = 0
PF Chg Status = 0000
PF Safety Status = 0000
PF Flags 2 = 0000
[AFE Regs(PF Status)]
AFE Status = 00
AFE Output = 00
AFE State = 00
AFE Function = 00
AFE Cell Select = 00
AFE OLV = 00
AFE OLT = 00
AFE SCC = 00
AFE SCD = 00

[Data(Calibration)]
CC Gain = 10.484
CC Delta = 10.484
Ref Voltage = 1225.10
AFE Pack Gain = 790.89
CC Offset = -0.246
Board Offset = -37.2
Int Temp Offset = 3.5
Ext1 Temp Offset = -2.3
Ext2 Temp Offset = 0.0
[Config(Calibration)]
CC Current = 3000
Voltage Signal = 16800
Temp Signal = 298.0
CC Offset Time = 250
ADC Offset Time = 32
CC Gain Time = 250
Voltage Time = 1984
Temperature Time = 32
Cal Mode Timeout = 300
[Temp Model(Calibration)]
Ext Coef 1 = -28285
Ext Coef 2 = 20848
Ext Coef 3 = -7537
Ext Coef 4 = 401.2
Ext Min AD = 0
Ext Max Temp = 401.2
Int Coef 1 = 0
Int Coef 2 = 0
Int Coef 3 = -11136
Int Coef 4 = 575.4
Int Min AD = 0
Int Max Temp = 575.4
[Current(Calibration)]
Filter = 50
Deadband = 3
CC Deadband = 10.0
    Fullscreen NCR18650B_T4.log Download 
    bq EVSW Version: 0.9.59 for bq20z95 v1.50	
Device:950,Ver:1.50
2017-03-20 10:26:03	
           
Design Capacity: 6400 mAH
Design Voltage: 10800 mV
Specification Info: 0031 hex
Manufacture Date: 06-nov-2016 
Serial number: 0001 
Manufacturer Name: FORSEE 
Device Name: O2Cncpt 
Device Chemistry: 2012 

Sample	Stamp	~Elapsed(s)	ManufAccess	RemCapAlarm	RemTimeAlarm	BattMode	@Rate(@)	@TimeFull	@TimeEmpty	@RateOK	Temperature	Voltage	Current	AvgCurr	MaxErr	RSOC	ASOC	RemCap	FullChgCap	RunTimeEmpty	AvgTimeEmpty	AvgTimeFull	ChgCurr	ChgVolt	BattStat	CycleCnt	CellV4	CellV3	CellV2	CellV1	FETStatus	SafetyAlert	SafetyStat	PFAlert	PFStat	OpStat	ChgStat
1	10:26:07	0	0000	660	10	0001	0	65535	65535	1	19.75	12345	0	0	1	56	6	323	577	65535	65535	65535	4000	16800	02C0	2	0	4115	4115	4115	0006	0000	0000	0000	0000	8443	0200
2	10:26:11	4	0000	660	10	0001	0	65535	65535	1	19.95	12345	0	0	1	56	6	323	577	65535	65535	65535	4000	16800	02C0	2	0	4115	4115	4116	0006	0000	0000	0000	0000	8443	0200
3	10:26:15	8	0000	660	10	0001	0	65535	65535	1	19.95	12345	0	0	1	56	6	323	577	65535	65535	65535	4000	16800	02C0	2	0	4115	4115	4116	0006	0000	0000	0000	0000	8443	0200

  • 0 in reply to Artin Pirouzram
    Prodigy 70 points
    Terry_Chen,
    I saved the gg file as a txt file to be able to upload it here.

    Best regards
    Artin
  • 0 in reply to Artin Pirouzram
    TI__Intellectual 1735 points

    • Hi,
    • I have checked the datasheet of NCR18650B.
    • The Fast Charge Current is 4000 in your log file. The max charge current of NCR18650B is 0.5C which stands for 1625mA
    • The Charging Voltage = 16800 in your log file, with 3S2P, The charging voltage should be 4.2*3=12.6V (12600mV)
    • The Taper Voltage = 300 , Over Charging Voltage = 500,Term Voltage = 12000 also need to be modified to your value

    • Qmax Cell 0 = 6695
      Qmax Cell 1 = 6675
      Qmax Cell 2 = 6683
      Qmax Cell 3 = 6400

    • There are 4 cells in your log file and your config is 3S2P, please check you configuration for your battery.