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BQ34Z100-G1: Can't get the device to turn to learning status, calculated capacity not correct

Sibe Jan Koster
Prodigy 150 points
Part Number: BQ34Z100-G1

I use BQ34Z100-G1 with a 7Ah 12V lead acid battery (closed cell). I use 808 chemistry. After 9 charge-discharge cycles, the values are still off. Also the learned status does not change.

The flags seem to be allright. One error I can see is that the CHG flag is not removed on discharging. What is happening ? 

SJK

BQ34Z100-G1 device startup

  1. Charge with 1.220 A from empty
    1. Sample # = 1 (4 sec interval)
    2. Control status = 0x0213, after a few seconds changes to 0x0203

                             i.      SLEEP, VOK, QUEN, CSV (valid checksum)

                             ii.      SLEEP, VOK, CSV

      1. Full charge = 2828 (??)

      2. Learned = 4

      3. Flags = 0x1116

               i.      SOC1, SOCF, CF, CHG, BATLOW (not updated)

      1. FlagsB = 0x2400

                                      i.      DODEOC, FIRSTDOD

    1. Pack config = 0x09D9
    2. TrueRC = -10462 (increasing)
    3. DOD0 = 15552
    4. Qmax passed = 0 (decreasing)
    5. QMax time = 0 (increasing with about 1 per minute)
    6. State of charge = 0

  2. Event: charger disconnected at Vbatt = 13.542, current from 0,2 A to 0
    1. Sample # = 5695
    2. Control status changed back to 0x0213 (QUEN)
    3. Available Energy = 5890
    4. Flags changes from 0x0116 to 0x0290 (CF, OCVTAKEN, FC)
    1. TrueRC changes from -4251 to 2829
    2. DOD0passed changes from -6211 to -1

  2. Event: load connected after rest. (Vbatt = 12.894 orginally, current = - 0,538)
    1. Sample # = 19525
    2. State of charge = 100, decreasing
    3. Remcap = 3042, decreasing
    4. Flags = 0x0290 later 0x0291 (i.e. DSG)

  3. Event: IT started again, reset again(Vbatt = 11.886 (under load))
    1. Sample # = 25610
    2. State of charge from 37 -> 0
    3. Remaining capacity from 1114 to 0
    4. Full charge cap from 3042 to 3500
    5. Flags from 0x0191 to 0x1197(SOC1, SOCF, DSG, CF, OCVTAKEN, CHG (??), BATLOW)
      1. TrueRC from 5772 to -2

    4.
    Event: load disconnected. (Vbatt = 10.848 under load, current = -0,462)
    1. Flags from 0x1197 to 0x1116
    2. Grid number from 4 to 5
    3. Learned status still 4
    4. Qmax passed 568
  • 0
    TI__Guru** 105760 points

    Hello Sibe,

    Could you provide the .gg and the log of the cycles? It is hard to debug from looking at the posted information.

    Have you programmed the design capacity, terminate voltage, and FC into the gauge?

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 150 points

    Thank you for your quick response !

    I have attached the files.

    I have set the design capacity in /configuration/data at 7000

    The termination voltage is set at /configuration/discharge/cell BL setvolt threshold at 1980

    cell BH setvolt threshold is 2300

    Flash update cell volt is 2800

    Cell BH clear threshold is 2200 and 2000 (it is mentioned twice, I should probably set the same value)

    Sibe Jan Koster

    SJK PbA log20200619fullcharge from empty.zip

  • 0 in reply to Sibe Jan Koster
    TI__Guru** 105760 points

    Hello Sibe,

    Could you export the .gg file, it takes longer to look through all the .fs files. With the .gg we can easily see any configuration problems.

    In your log file at the end of the first charge the current looks really choppy, this can cause some issues while performing the learning cycle. Try to provide the cleanest charge/discharge cycles you can during the learning period and see if it completes successfully.

    Also make sure to follow this closely to make sure all the correct commands and bits are being set: http://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/8267.How-to-Complete-a-Successful-Learning-Cycle-for-the-BQ34z100.pdf

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 150 points

    Thank you.

    I have found how to make a .gg file from bq studio (attached).

    I use a lab power supply on CC/CV. I do not think it is unstable. I will try different currents.

    The product will be equipped with a MPPT solar charger. This will vary by the minute, until considered full by the charger. The testing includes 14.5 Volts pulses. It will then switch to maintenance charge, which is 12.4 V (stable). Could that be made to wordk with BQ34Z100-G1 ? Is there any documentation or things I could read ?

    Sibe Koster

    SJK_PbA_20200620.gg.csv

  • 0 in reply to Sibe Jan Koster
    TI__Guru** 105760 points

    Hello Sibe,

    Your configuration looks correct, I think your charge and discharge currents may be a little low from looking through the learning cycle document. Try cycling them again and follow the the guide:

    http://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/8267.How-to-Complete-a-Successful-Learning-Cycle-for-the-BQ34z100.pdf

    There are no application notes or reference designs for this kind of application yet, but the gauge should be able to gauge for this application.

    Sincerely,

    Wyatt Keller