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EM1402EVM - 16 Channels battery active balancing module

TEP Pungratanak
Prodigy 40 points
Other Parts Discussed in Thread: EM1402EVM, BQ76PL455A-Q1, LAUNCHXL-TMS57004, BQ76PL455A, EMB1499Q, EMB1428Q, TMS570LS0432

Hi everyone, 

I'm using EM1402EVM (16 channels active balancing module). 
- My purpose is to balancing the individual cells in the battery pack while charging. 
- My battery pack is composed by 15 batteries connected in series. (Lithium Ion Prismatic Pouch Cell AMP20M1HD-A)

I install BQ76Pl455A-Q1 GUI in order connect between PC and EM1402EVM (via USB port) 
- I can connect it properly and i can also see all the individual voltage. 
- But when i try to balance the cell, it doesn't work as expected and it was shown as following : 



- Status of Balancing indicator light on top was RED. (means it doesn't work)

So how can i balance cells in my battery pack ? Is there any other possible way to balance?

Best regards, 

TEP Pungratanak

  • 0
    Prodigy 90 points
    I am very new to this so maybe I am wrong, but I think the GUI does not support active balancing directly. You must also use LaunchXL-TMS57004 board.
    However I could not get that to work properly either and have just started a post about it myself.
  • 0
    TI__Genius 11480 points
    Hi Tep,

    The bq76pl455a gui sends the command for the bq76pl455a to balance, which is done through its own EQ pins. Essentially, the pl455 drives a mosfet to connect/disconnect a resistor and bleeds energy from each cell. The bq76pl455a EVM does this, and is known as passive balancing.

    The EM1402 EVM utilizes the pl455, but also t he EMB1499Q and EMB1428Q. The EMB chipset is for what is known as "Active" balancing, which is essentially a DC-DC and switch matrix. The EMB chipset runs off of SPI (which can be bit-banged from the pl455 GPIO, or come from an MCU...both options are on the EVM). Currently, there is no GUI for the EMB chipset.

    This reference design may be of use to you: www.ti.com/.../TIDM-TMS570BMS
  • 0 in reply to David Wiest Jr
    Prodigy 40 points
    Hi David,

    Thank you for your helpful answer.

    In design reference, it is recommended to use TMS570LS0432 MCU to control over EM1402EVM.

    I want to implement EM1402EVM with my battery pack (15S) into EV system without MCU.
    1. Is there any possible way to enable Active Cell Balancing mode on EM1402EVM without micro-controller ? If yes, how can we do?
    2. If micro-controller is mandatory, can we use any other TI MCU beside TMS570LS0432 MCU?

    Best regards,

    TEP Pungratanak
  • 0 in reply to Cliff Beale
    Prodigy 40 points
    Hi Cliff,

    Thanks for you response.

    In fact, I want to implement EM1402EVM with my battery pack (15S) into EV system without MCU.
    But if it is mandatory to use MCU, so can i use other TI board to control this ? Because now i've already own a LAUNCHXL-F28377S.

    Best regards,

    TEP Pungratanak
  • 0 in reply to TEP Pungratanak
    TI__Genius 11480 points

    Hi TEP,

    You will have to have an MCU to use either/or the bq76pl455A and EM1402 board. Most, if not all, battery monitoring IC's will require an MCU in an EV system.

    As long as the MCU is capable of UART for the pl455, it can be used. You will need a SPI interface to work with the EMB1499/EMB1428 chipset.
    We use the TMS570 because it is our MCU solution that adheres to functional safety guidelines, which is important in an EV application.

    The C2000 is also a good choice.

  • 0 in reply to David Wiest Jr
    Prodigy 40 points
    Hi David,

    Thanks for you response.

    Because i have already owned LAUNCHXL-F28377S, is it capable to use with EM1402EVM ?

    If yes, can you provide pin mapping between these two ?

    Best regards,

    TEP Pungratanak