This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ27542-G1: at -10degC low temp storage for more than 1hour,SOC from 100% directly jump to 0%

Part Number: BQ27542-G1
Other Parts Discussed in Thread: GPCRB

Dear Teams,

Our 2 MP project,now test find when at -10degC low temp storage for more than 1hour,SOC from 100% directly jump to 0%.

All test sample are the same result. is there any setting wrong?

Attached file are the test log data and gg file

Please help check.

Thank you.

18000-3.log118000MAH.gg.csv

  • Hello,

    Can you share a log of the SOC jumping as well?

    Have you performed the GPCRB calibration for cold temperatures? For very low temperatures you will need to use the GPCRB for the gauge to give better accuracy. It is expected with colder temperatures your SOC may decrease significantly.

    Sincerely,

    Wyatt Keller

  • Hi Wyatt,

    Attached file is the log,please check.

    The chem ID include the low temp,and we have performed the GPCRB calibration for cold temperatures.

    2161.18000-3.log

  • Hello,

    If you have completed a learning cycle as well and found the correct chemID it should correlate the DOD according to the OCV. Did you also perform a learning cycle before the GPCRB tool was used?

    Was the temperature higher before the log started so it is when an OCV is taken the SOC drops?

    Sincerely,

    Wyatt Keller 

  • Hi Wyatt,

    1,Did you also perform a learning cycle before the GPCRB tool was used?

    ---Yes,we do

    2,Was the temperature higher before the log started so it is when an OCV is taken the SOC drops?

    --how about the OCV take SOC drop?

    3,We test another project,it also occur the same issue.

    Test method: with 0.2C current charge to fullcharge at 25degC,then rest and change  temperature to -10degC,from 25degC to -10degC is slow.

    when temperature is -10degC for 1min,the SOC from 100% directly jump to 0%.then we change temperature to 25degC,when at -0.4degC,the SOC from 0% directly jump to 100%.

    Attached file are 3 file,one is charge and SOC from 100% to 0%, one is recovery,that is SOC from 0% to 100%, one  is gg file.

    Please help to check,thank you.256006 25degC charge and -10degC storage.log

    256006 25degC charge and -10degC storage-recover.log
    Tue Mar 02 21:17:38 CST 2021
    
    Device Name = bq27542G1
    Firmware Version = 2_01
    
    
    Sample,DateTime,ElapsedTime,Control,CtrlStatus,SOCUnfiltered,Temperature,Voltage,Flags,NomAvailCap,FullAvailCap,RemCap,FullChgCap,AvgCurrent,TimeToEmpty,FCCFiltered,SafetyStat,FCCUnfiltered,MaxLoadCurrent,RCUnfiltered,RCFiltered,BTPSOC1Set,BTPSOC1Clear,IntTemp,CycleCnt,StateofCharge,StateofHealth,ChargeVoltage,ChargeCurrent,Passed Charge,DOD0,SelfDischargeCurrent,PackConfig,DoDatEOC,Qstart,Fast Qmax,Qmax,OCV Current,OCV Voltage,Int Stat,ResScale,DodFinal,LogRowTime(ms),LogStatus
    1,2021-03-02 21:17:49,10.269,0x0201,0x009B,0,-2.6,4315,0x0836,7275,7275,1,0,0,65535,0,0x0,0,1439,0,0,750,1125,4.0,64,0,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1246,947,SUCCESS
    2,2021-03-02 21:17:58,20.002,0x0201,0x009B,0,-2.6,4315,0x0836,7275,7275,1,0,0,65535,0,0x0,0,1439,0,0,750,1125,4.0,64,0,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1246,946,SUCCESS
    3,2021-03-02 21:18:09,30.361,0x0201,0x009B,0,-1.8,4315,0x0836,7275,7275,1,0,0,65535,0,0x0,0,1518,0,0,750,1125,4.3,64,0,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1246,978,SUCCESS
    4,2021-03-02 21:18:18,40.003,0x0201,0x009B,0,-1.8,4315,0x0836,7275,7275,1,0,0,65535,0,0x0,0,1518,0,0,750,1125,4.3,64,0,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1246,945,SUCCESS
    5,2021-03-02 21:18:29,50.361,0x0201,0x009B,0,-1.1,4314,0x0836,7275,7275,1,0,0,65535,0,0x0,0,1592,0,0,750,1125,5.2,64,0,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1246,992,SUCCESS
    6,2021-03-02 21:18:38,60.004,0x0201,0x009B,0,-1.1,4314,0x0836,7275,7275,1,0,0,65535,0,0x0,0,1592,0,0,750,1125,5.2,64,0,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1246,991,SUCCESS
    7,2021-03-02 21:18:49,70.266,0x0201,0x009B,100,-0.4,4315,0x0836,7271,7271,324,324,0,65535,324,0x0,324,1671,324,324,750,1125,6.5,64,100,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,946,SUCCESS
    8,2021-03-02 21:18:58,80.006,0x0201,0x009B,100,-0.4,4315,0x0836,7271,7271,324,324,0,65535,324,0x0,324,1671,324,324,750,1125,6.5,64,100,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,1004,SUCCESS
    9,2021-03-02 21:19:09,90.358,0x0201,0x009B,100,0.3,4315,0x0836,7271,7271,324,324,0,65535,324,0x0,324,1753,324,324,750,1125,7.4,64,100,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,963,SUCCESS
    10,2021-03-02 21:19:18,100.007,0x0201,0x009B,100,0.3,4315,0x0836,7271,7271,324,324,0,65535,324,0x0,324,1753,324,324,750,1125,7.4,64,100,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,955,SUCCESS
    11,2021-03-02 21:19:29,110.391,0x0201,0x009B,100,1.0,4315,0x0836,7271,7271,324,324,0,65535,324,0x0,324,1837,324,324,750,1125,8.3,64,100,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,992,SUCCESS
    12,2021-03-02 21:19:38,120.008,0x0201,0x009B,100,1.0,4315,0x0836,7271,7271,324,324,0,65535,324,0x0,324,1837,324,324,750,1125,8.3,64,100,99,0,0,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,969,SUCCESS
    13,2021-03-02 21:19:49,130.279,0x0201,0x009B,100,1.7,4315,0x003E,7271,7271,324,324,0,65535,324,0x0,324,1930,324,324,750,1125,9.0,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,946,SUCCESS
    14,2021-03-02 21:19:58,140.009,0x0201,0x009B,100,1.7,4315,0x003E,7271,7271,324,324,0,65535,324,0x0,324,1930,324,324,750,1125,9.0,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,999,SUCCESS
    15,2021-03-02 21:20:09,150.279,0x0201,0x009B,100,2.5,4315,0x003E,7271,7271,324,324,0,65535,324,0x0,324,2036,324,324,750,1125,9.9,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,946,SUCCESS
    16,2021-03-02 21:20:18,160.010,0x0201,0x009B,100,2.5,4315,0x003E,7271,7271,324,324,0,65535,324,0x0,324,2036,324,324,750,1125,9.9,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,949,SUCCESS
    17,2021-03-02 21:20:29,170.404,0x0201,0x009B,100,3.3,4315,0x003E,7271,7271,324,324,0,65535,324,0x0,324,2150,324,324,750,1125,10.6,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,978,SUCCESS
    18,2021-03-02 21:20:38,180.011,0x0201,0x009B,100,3.3,4315,0x003E,7271,7271,324,324,0,65535,324,0x0,324,2150,324,324,750,1125,10.6,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,948,SUCCESS
    19,2021-03-02 21:20:49,190.387,0x0201,0x009B,100,4.0,4314,0x003E,7271,7271,324,324,0,65535,324,0x0,324,2254,324,324,750,1125,11.2,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,977,SUCCESS
    20,2021-03-02 21:20:58,200.012,0x0201,0x009B,100,4.0,4314,0x003E,7271,7271,324,324,0,65535,324,0x0,324,2254,324,324,750,1125,11.2,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,1946,978,SUCCESS
    21,2021-03-02 21:21:09,210.287,0x0201,0x009B,100,4.7,4315,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2363,3106,3106,750,1125,11.9,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,7403,967,SUCCESS
    22,2021-03-02 21:21:18,220.014,0x0201,0x009B,100,4.7,4315,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2363,3106,3106,750,1125,11.9,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,7403,976,SUCCESS
    23,2021-03-02 21:21:29,230.369,0x0201,0x009B,100,5.4,4315,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2482,3106,3106,750,1125,12.4,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,7403,963,SUCCESS
    24,2021-03-02 21:21:38,240.015,0x0201,0x009B,100,5.4,4315,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2482,3106,3106,750,1125,12.4,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,7403,958,SUCCESS
    25,2021-03-02 21:21:49,250.369,0x0201,0x088B,100,6.3,4314,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2482,3106,3106,750,1125,13.3,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,7403,978,SUCCESS
    26,2021-03-02 21:21:58,260.016,0x0201,0x088B,100,6.6,4314,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2482,3106,3106,750,1125,13.7,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,7403,956,SUCCESS
    27,2021-03-02 21:22:09,270.274,0x0201,0x009B,100,6.7,4315,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2711,3106,3106,750,1125,13.7,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,7403,947,SUCCESS
    28,2021-03-02 21:22:18,280.017,0x0201,0x009B,100,6.7,4315,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2711,3106,3106,750,1125,13.7,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,7403,986,SUCCESS
    29,2021-03-02 21:22:29,290.274,0x0201,0x009B,100,7.4,4314,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2838,3106,3106,750,1125,14.5,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,7403,947,SUCCESS
    30,2021-03-02 21:22:38,300.018,0x0201,0x009B,100,7.4,4314,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2838,3106,3106,750,1125,14.5,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,7403,952,SUCCESS
    31,2021-03-02 21:22:49,310.423,0x0201,0x009B,100,8.1,4315,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2982,3106,3106,750,1125,15.5,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4316,0x3240,0,7403,985,SUCCESS
    32,2021-03-02 21:22:58,320.019,0x0201,0x009B,100,8.1,4315,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,2982,3106,3106,750,1125,15.5,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4314,0x3240,0,7403,950,SUCCESS
    33,2021-03-02 21:23:09,330.383,0x0201,0x009B,100,8.9,4315,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,3141,3106,3106,750,1125,16.5,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4314,0x3240,0,7403,976,SUCCESS
    34,2021-03-02 21:23:18,340.020,0x0201,0x009B,100,8.9,4315,0x003C,7267,7267,3106,3106,0,65535,3106,0x0,3106,3141,3106,3106,750,1125,16.5,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4314,0x3240,0,7403,996,SUCCESS
    35,2021-03-02 21:23:29,350.286,0x0201,0x009B,100,9.8,4314,0x003C,7263,7263,4830,4830,0,65535,4830,0x0,4830,3344,4830,4830,750,1125,17.4,64,100,99,4350,1500,0,314,1,0x217D,840,65284,0,7834,0,4314,0x3240,0,11025,948,SUCCESS
    
    -10degC storage gg.gg.csv

  • Hello,

    Can you share the data submitted and the GPCRB report that was returned? I'd like to take a look at the data.

    If you have completed the GPCRB tool you should get higher accuracy at lower temperatures unless there was an issue with the report.

    It will also drop if the chemID is not a good match if it's jumping when an OCV is taken. You can review SLUA450 for more information on the impedance track algorithm.

    Sincerely,

    Wyatt Keller

  • Hi Wyatt,

    Attached file is the GPCRB report,please check.

    Thank you.256006-report.zip

  • Hello,

    Can you also share the data submitted? The data submitted for low temperature should be close to your applications temperature or it may not help as much as expected.

    Sincerely,

    Wyatt Keller

  • Hi Wyatt,

    Please check,thank you.

    If data memory setting wrong,do it make the issue?

    256006.zip

  • Hello,

    The data looks okay, I see your terminate voltage is set fairly high (3450mV) I would make sure you cycle the batteries the full voltage range for the battery spec for the GPCRB and learning cycling.

    Sincerely,

    Wyatt Keller

  • Hi Wyatt,

    We did learning cycle with terminate voltage 3450mV.

    Now,how to solve the issue? Could you give us some advice.

    Thank you.

     

  • Hello,

    Let me review your data further and get back to you later this week.

    Sincerely,

    Wyatt Keller

  • Hi Wyatt,

    How about the issue? 

    Could you give us some advice.

    Thank you.

  • Hello,

    I can't find any issues with the data you submitted or the report. When you got the data from the report did you upload the .gg file and use the chemdat data to upload the chemistry ID again? The corrections are within the report data that must be uploaded.

    Sincerely,

    Wyatt Keller

  • Hi Wyatt,

    When we got the data from the report,we had upload the .gg file and use the chemdat data to upload the chemistry ID,then did learning successful

  • Hello,

    That is the correct procedure to get the GPCRB data uploaded.

    Make sure there is no load on your system at the low temperatures, when the gauge takes an OCV even with a small discharge at low temperatures it could drop the voltage significantly.

    Sincerely,

    Wyatt Keller