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Battery Module. BMS system

user512135966
Intellectual 390 points
Part Number: EM1402EVM
Other Parts Discussed in Thread: BQ76PL455A-Q1,

Hi,

I'm using EM1402EVM together with LAUNCHXL-TMS57004. I have some questions about the BMS and the Battery Module.

1) In the TI Design it says that the active cell balancing works with and an external 12-V supply or with another battery pack. Does this means that the active cell balancing doesn't work or the EV1402 doesn't work? Can I still monitoring the battery module with the BQ76PL455A-Q1?

2) Can I monitor the charge and discharge while the battery pack supply a Driver motor + BLDC motor?

3) Can I connect the external 12V supply connectors to the battery module to charge or discharge one cell of the battery with the battery module itself? (it may be confusing)

Thanks.

  • 0
    TI__Mastermind 19795 points

    Hi user,

    Thank you for your question!

    I would highly recommend using the BQ76PL455A-Q1 and passive balancing rather than the combined EM1402 system. We will soon be unable to support the EM1402 for new designs.

    To summarize the previous answers:

    1) Active balancing works on EM1402 using a microcontroller , and you can monitor voltages from the onboard BQ76PL455A-Q1 with a GUI (separate, and only for viewing). It is simpler to instead use BQ76PL455A-Q1 EVM with passive balancing, as you can enable balancing AND cell readings with the GUI. Two-way communications using the GUI is supported with the BQ76PL455A-Q1 EVM.

    2) You can monitor the voltages across each cell, but the charge/discharge rate is not supported with EM1402 or BQ76PL455A-Q1.

    3) The EM1402 cannot work without a 12V battery. See: https://e2e.ti.com/support/power-management/f/196/p/702095/2596224?tisearch=e2e-sitesearch&keymatch=EM1402%20cell%20balancing%20during%20charging#2596224

    Regards,

    Vince

  • 0 in reply to Vince
    Intellectual 390 points
     What does this 12V battery represent in a system?
    thanks for your quick response
  • 0 in reply to user512135966
    TI__Mastermind 19795 points

    Hi Ángel,

    This 12V battery represents the energy storage location for the EM1402EVM system. This is where the energy is sent when a cell is active balanced. The EM1402EVM is designed specifically to work with 12V batteries as this energy storage location, and so requires a 12V battery for functionality.

    Let me know if this answers your question!

    Regards,

    Vince

  • 0 in reply to Vince
    Intellectual 390 points

    Yes, thank you!

    I only have one more. It's like number 3 but with a image:

    Can the battery module and 12V battery be shared? I just want to know if I can monitor and do the active balancing with one battery.

  • 0 in reply to user512135966
    TI__Mastermind 19795 points

    Hi Ángel,

    Unfortunately, the EM1402EVM is designed for a 12V battery in particular. If the battery pack is running at a higher voltage than the nominal voltage for 12V batteries or it is not transferring the power to an EXTERNAL battery, it will likely cause issues with the way the system transfers energy.

    Because the particular design is meant for 12V batteries, we cannot recommend using it in the way depicted in the picture. It may be possible by tweaking the components being used, and heavily modifying the source code, but again, this is outside of our recommendations for the system, and we cannot provide support for such a system.

    Let me know if you have any other questions!

    Regards,

    Vince

  • 0 in reply to Vince
    Intellectual 390 points

    Thank you very much.