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BQ34110: how to set up multicell in BQ studio for bq34110?

Part Number: BQ34110

I am trying to set up 8S Lifepo4 guage bq34110 under BQStudion, unfortunatelly without sucess, is ther somebody who can help? Advances? step-by-step instructions, exmaples, BQ projects?

(working with bq34110EVM-796 board)

thanks a lot

  • Hi Valentin,

    Please follow the steps in the EVM guide for calibrating the board: www.ti.com/.../sluubi1.pdf

    In general, the flow for using a CEDV gauge like the bq34110 is to:

    1) Calibrate the board
    2) Use the GPCCEDV tool to determine parameters for the battery, found here: http://www.ti.com/tool/gpccedv
    a) This will require taking 6 logs, as described in the gpccedv tool documentation
    b) Logging may be accomplished with bqStudio + EV2400 + EVM or with a tool such as an Arbin or Maccor
    c) Program the returned parameters from the GPCCEDV tool in the gauage
    3) Set parameters in the gauge based on single cell values. These parameters are discussed in detail in the TRM found here: www.ti.com/.../sluubf7
    4) Fully charge and discharge the battery
    5) Test for SOC accuracy

    Sincerely,
    Bryan Kahler
  • In reply to Bryan Kahler:

    Hi Bryan,

    thank you for feedback, I will follow up with this procedure, but it is time consuming and need additional eqipment (chiller). Also my setup behaves very strange, described in my previous post (I have ordered EV2400 inbetween, to see if issues are gone, hope they will)
    I am able to calibrate bq34110EVM-796 for single cell but not able to callibrate it for 8S config, it seems to be something goes wrong because if I change Nr of serial cells from 1 to 8 VEN bit is set and EV2300 (rev.r) it shows voltage of the pack (incorrect one like 7V instead of 25,6V). According to DS sensing bat voltage shopuld be below 0,9V because of linearity, but assuming Volage diider parameter to be 16bit the max value cannot reach 65V as declared in DS and tech ref manual, additionally EV2300 stopps communicating and there is only one way to return, program using previous project golden file.

    here are follow up questions:
    -how to calibrate 8S cell confiig?

    - is there a way to configure q34110 without GPC tool to indicate correct voltage for8S Lifepo4, accuracy not important in this step
    (which partameters to assume?) step by step instructions will really help, I believe it should be able to estimate charge level and capacity after first discharge, or it is valit only vor impedance tracking?

    - it is not clear for me someparameters, maybe I missed some manual except DS, tech. ref.manual, esspecially menaing of parameters like "Configuration/Number of Series cells" what is the meaning of "Calibration/Voltage divider" for multicell application in BQStudio?

    -in BQ studio, chemistry fileas re suported for this gugae, because I do not see them (my previous post)

    Valentin
  • In reply to Valentin Kulikov:

    even better, is there golden file for 8s Lifepo4 2,5Ah power pack available to obtain for BQstudio? I can strat work with and check if system is ok or not?
    once there are may of GPC measureents submitted I believe you shoud have coople of them, this will really help. thanks a lot.
  • In reply to Valentin Kulikov:

    Hi Valentin,

    The log for the GPCCHEM tool should be run at room temp. Using 1S for the GPCCHEM tool will work well.

    With respect to the 8S configuration, the external jumpers will need to be utilized. Place the jumpers of the EVM into >5 mode and the divider jumpers to 36 V.

    Set the Series = 8 and VEN_EN = 1.

    Now calibrate the voltage in the calibration tab of bqStudio. This will automatically modify the voltage divider value for you.

    Sincerely,
    Bryan Kahler

  • In reply to Bryan Kahler:

    Thank you Brian,

    Unfortunatelly this does not work with current set-up using EV2300 rev.m, will wait for EV2400 (ordered last week) hope it will work and can try agin.

    Let see if EV2400 will work as should otherwise it was just loosing of time and money.

    Valentin

  • In reply to Valentin Kulikov:

    Hi Valentin,

    I apologize, the line in the post above has been stricken out. The GPCCHEM tool is used for IT gauges. The bq34110 is a CEDV gauge and uses the GPCCEDV tool, not the GPCCHEM tool. Please follow the other steps listed in the post:

    With respect to the 8S configuration, the external jumpers will need to be utilized. Place the jumpers of the EVM into >5 mode and the divider jumpers to 36 V.

    Set the Series = 8 and VEN_EN = 1.

    Now calibrate the voltage in the calibration tab of bqStudio. This will automatically modify the voltage divider value for you.

    A temperature chamber will be required to determine the parameters for your battery when using the bq34110. In more detail:

    The bq34110 is a CEDV gauge and the GPCCEDV tool must be used to determine the parameters for the battery. A temperature chamber is required for the 6 logs required wherein logs of 2 current loads are required across 3 temperature ranges. As linked above in the initial response, please follow the GPCCEDV guide found in the GPCCEDV tool folder, here: http://www.ti.com/tool/gpccedv

    In general, the flow for using a CEDV gauge like the bq34110 is to:

    1) Calibrate the board
    2) Use the GPCCEDV tool to determine parameters for the battery, found here: http://www.ti.com/tool/gpccedv
    a) This will require taking 6 logs, as described in the gpccedv tool documentation
    b) Logging may be accomplished with bqStudio + EV2400 + EVM or with a tool such as an Arbin or Maccor
    c) Program the returned parameters from the GPCCEDV tool in the gauage
    3) Set parameters in the gauge based on single cell values. These parameters are discussed in detail in the TRM.
    4) Fully charge and discharge the battery
    5) Test for SOC accuracy

    Sincerely,
    Bryan Kahler
  • In reply to Bryan Kahler:

    Hi Bryan,

    Thank you for answer, short summary - does not work for 8S config

    EV2400 arrived today, we currently have alredy 2x EV2300 and EV2400, after powering set-up on, looks it behaves the same (same issues), not responding to changes of "Number of Cells" neither of VEN_EN, IC on the board is ok, replaced with new one without functionality change. Photo of the setup attached.

    BQstudio dashbord after starting, as you can notice there is no voltage indicated, this issue can be related to no voltage on measured bucesue dafultly VEN_EN is set to 0 (factory settings), I believe this is a reason, due to "Flash update OK voltage" - not documented

    if I connect two white vires to get VEN_EN working board indicates just 607 mV (below 1V as recommended), but still not possible tio update values in BQ studion:

    see notice at the bottom: "A read of datawritten failed comparision"

    Connecting REGON to divider output, increases voltage to REGIN value that is above "Flash update OK voltage" 2800mV, now it is possible to change settings

    connection on the board:

    afterwords I have changed "Flash Update OK Value" to 500mV

     

    now we change VEN_EN, BTW: it should be marked in bqstudio what colors means green 0, red 1, not to loook around...

    after disconnectionall artifical wires from board, board finally indicates voltage 3545 mV, No of cells is just 1

    now let continue with your recommndations step by step 

    No of series cells changed to 8, written

    voltage remains the same, but setting cannot be changed again,...

    reading of values works, writting not

    i think there is serious problem with this eval kit type, I propose to check it yourself.

    looking forward hearing from you

  • In reply to Valentin Kulikov:

    Note: after trying again and setting of "Flash Update OK voltage" to 100 mV resolved the issue (definetelly eval kit issue for multicel config), now I was able to eneter correct values and calibrate, I have tried GPC cycle to grab initial measurements, but what mens EDV0 voltage (addressed i nseparate question) in case of 8S cell config and which parameters to set-up to GPC cycle knows battery is fully charged (becuse protection electronics already disconnected the pack but GPC cycle still ask to connect charger)? It looks for me one issue is just replacing another one ...
  • In reply to Valentin Kulikov:

    Hi Valentin,
    I'm sorry to hear about the issues you have experienced so far. You are correct in updating the "Flash Update OK Voltage". The default value for this parameter is too high when using the external resistor divider with a large number of cells.
    I see you have started another thread regarding the EDV0 voltage. Would it be okay to close this thread?
    Matt

     

  • In reply to Matt Sunna:

    Hi Matt,
    practically we both did not solve it , once still missing step by step instructions for multicell config, asked in the begining of the thread. We got only to calibration and intial measurement, that failed, but there are many ot other parameters they need attantion
    still looking to get instructions for lifepo4 8S pack, thanks

    there are still a lot of questions, becuase we have not found measurement conditions for lifepo4 defined (load propetiees, temperature deviation, relaxation, etc...), it is not clear if we need to use climate chamber or something else.

    thanks,
    Valentin

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