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BQ40Z60: Running Learning Cycle

Jerry West
Intellectual 320 points
Part Number: BQ40Z60
Other Parts Discussed in Thread: EV2400,

I am using the Battery Management Studio 1.3.54.1. It offers a menu option of Auto Cycle. It suggests logic signals of 5 Volts are available at the I2C connector, Vout and SDA to control by load and charge devices. After checking the terminal assignments, then starting the cycle with discharge or with charge, the I2C port remains Vout = +5 and SDA = 0. This is the same with either EV2300 or EV2400. The training video indicates that manual cycle or automatic should be available. I cannot locate the menus shown in the video.

When running a learning cycle, is the load and charge applied directly to the Bat+ and PGND or VSYS and GND? 

  • 0
    TI__Mastermind 34775 points

    Hi Jerry,

    The auto cycle menu option in Battery Management Studio 1.3.54.1 is for our Gauge Development Kit (GDK), which unfortunately doesn't support >1S gauges as bq40z60.

    GDK - www.ti.com/.../sluub24.pdf

    You will have to manually cycle your cells or develop your own cycling automation. 

  • 0 in reply to Damian Lewis
    Intellectual 320 points
    How should I perform the learning cycle for the BQ40Z60 to get the gauge working. Can you refer me to a document that will show me the sequence of commands, discharge, relax time, charge, and relax time as well as exactly where to connect the charger and load?
  • 0 in reply to Jerry West
    TI__Mastermind 34775 points
    Hi Jerry,

    There's not a specific learning cycle guide for bq40z60, but here's a reference document you can use.

    www.ti.com/.../slua450.pdf

    You can use the bq40z60 integrated charger for charging and an electronic load for discharging.

    - Discharge to terminate voltage with between C/5 to C/10 load
    - Relax 5 hours
    - Charge to full with C/2
    - Relax 2 hours
    - Discharge to terminate voltage with between C/5 to C/10 load
    - Relax 5 hours
  • 0 in reply to Damian Lewis
    Intellectual 320 points
    Is it ok to add time to the relax time? Without some automation the cycle doesn't fit work day schedule. The cycle above would require 18 hours attendance. If extending the discharge relax time overnight, the cycles would could be fit into an extended workday.
    If I charge and discharge through the FETs at VSYS, cycle termination would not require continous monitoring. Please let me know if the added relax time causes any problem and if using the FETs to end cycles would work.

    Jerry
  • 0 in reply to Jerry West
    TI__Mastermind 34775 points
    Hi Jerry,

    Extra relax time doesn't cause an issue. The issue would be not enough relax time.
  • 0 in reply to Damian Lewis
    Intellectual 320 points

    Hi,

    I ran learning cycles over the weekend. The CHG and DSG FET's switched at the proper cell voltages. The RSOC and ASOC values are not working. With ce ll voltages at 3720 mV RSOC = 4% ASOC = 3%. At cell voltages of 4195 mV, RSOC = 100%, ASOC = 98%. I have captured  my register screens and the Settings and Gas Gauging screens. Please advise what you think I am doing wrong.

    Relax time were about 12 hours.

    Jerry

     

     

     

     

     

     

  • 0 in reply to Jerry West
    TI__Mastermind 34775 points

    Hi Jerry,

    Don't pay too much attention to SOC at this point. You need to follow the instructions I provided to you. Discharge to Term Voltage (3000mV/Cell or 12000mV pack) that you set in data flash. Rest for 5hrs then charge to charge termination voltage (4200mV/Cell or 12800mV pack). Rest for 2hrs then discharge to Term Voltage (3000mV/Cell or 12000mV pack).

    Prior to running learning cycle ensure update status is set for an unlearned gauge (0x04). After successful learning cycle update status should be 0x06. Also ensure Ra Flag is set to 0xFF55 or 0xFFFF prior to learning cycle for all cells.