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BQ4050EVM-561: 10.8V battery connection

Ziwen Liu
Prodigy 20 points
Part Number: BQ4050EVM-561
Other Parts Discussed in Thread: BQSTUDIO, BQ34110, BQ34Z100-G1, GPCCEDV

Dear Colleagues,

I have 3S Li-in batteries that I want to use BQ40Z50-561 to charge / monitor. As the battery is packaged with only V+(9-12.7), V-, and 3 SMB lines, how should I connect / configure  for  the board to work properly with the Battery Management Studio? I connected the battery V+ to 3P, V- to 1N and shorted 3p and 4p, Connected Pack+ / - to a 15V power supply. When all drivers are installed, the Battery Management Studio seem to talk to the board, but I cannot see any charging going on, the power supply keeps showing 0 current, and the voltage between 3P and 1N is 2.7V. Should I add resisters between 1p/1n and 2p/2n?

Many thanks,

Ziwen

  • 0
    TI__Mastermind 25955 points
    Hi Ziwen,

    Figure 2. in the EVM User's Guide shows how to connect 1-4 cells with the EVM. Please refer to Figure 2. Cell Connection Configuration on Page 4 of the User's Guide found here: http://www.ti.com/lit/sluuav7

    For a 3S configuration, populate your cells between (1N,1P), (1P,2P) and (2P,3P). Short (3P,4P) with a piece of wire.

    If you're using a resistive ladder and power supply as a 'battery simulator', please populate the 1K resistors and piece of wire between the terminal block connections described above and in Figure 2.

    Please let me know if you run into another other issues!

    Sincerely,
    Bryan Kahler
  • 0 in reply to Bryan Kahler
    Prodigy 20 points

    Bryan

    Thank you very much for the quick response. 

    My battery is a packaged one, with only V+=11V and V-=Ground. The other 3 available pins are for SMBus from the battery, which I disconnected to the BQ40Z50EVM. In the attached pictures, you will see my connections and the BqStudio display (1.3.80)

    The resisters I used are 1.2k. As I had no access to the cells, I had to use them as simulators, I am not sure if this is OK, please advise.

    How do I start the charging and gauging? I pressed the WAKE button and also connected the Sys Pres to ground, but no charging is going. Is it possible the battery is too full, as it is more than 10.8V?

    Thank you very much for answering my questions.


    Ziwen

    How wou

  • 0 in reply to Ziwen Liu
    TI__Mastermind 25955 points
    Hi Ziwen,

    Your battery simulator looks great! When configuring gauges, the battery simulator can be very helpful - you don't have to wait for the battery simulator to charge/discharge (unlike batteries), just turn the dial on your power supply!

    Thank you for the images - they're very helpful. In your final device, will you be breaking apart the pack and connecting the cells individually? If not, a strap-on-gauge may be what you need, such as the bq34z100-G1 or bq34110.

    Please check with your pack manufacturer - there may already be a gauge inside your pack, or at the very least protection circuitry.

    Could you describe your application and use case in more detail?

    To set up your gauge, you will need to step through the TRM (it's quite large).

    Roughly speaking, you will need to:
    1. Set up bqStudio and connect to EVM
    2. Configure Dataflash parameters
    3. Follow the steps in the GPCCEDV tool that will include running 6 different cycles for your battery and submitting those 6 logs in a particular format to the GPCCEDV tool. Then, set your CEDV parameters in your gauge that are returned by the tool.
    4. Calibrate your gauge
    5. Run a learning cycle.

    Sincerely,
    Bryan Kahler
  • 0 in reply to Bryan Kahler
    TI__Mastermind 25955 points
    Hi Ziwen,

    If the above response helped resolve your question, please click on the 'This Resolved my Issue' button below to improve the find-ability of this response for others that may have the same issue. Thanks!

    Sincerely,
    Bryan Kahler