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Original question:

Stackable Multicell balancer for series/parallel cells

BQ79606EVM-897: Safety aspects of Battery stack HV EVM

Navin Babu S
Intellectual 345 points
Part Number: BQ79606EVM-897

Hi,

We are trying to build a battery pack BMS POC for a friend's company. We finalized to use BQ79606EVM-897 module to build this BMS along with a TI mC.

However, there were multiple warnings in the EVM user manual mentioning that this board could have high voltages and should be used only by qualified professionals. 

I am a hobbyist and have worked on Arduino-based projects before. In this POC, I would be using a max of 6V (2s1p config) in one battery stack EVM and again 6V in another battery stack EVM. Two EVMs to build Daisy chain in the POC.

Would it be risky to work on this EVM? Though I intend to use low voltage cells for POC, I am not sure if the internal circuitry would generate higher voltage/current.

Also, in future, we would like to use this EVM to build a 48V BMS. How would this change the electrical risks?

Thanks in advance for your response.

Regards,

Milir

  • 0
    TI__Genius 17370 points
    Hi Milir/Navin,

    The bq79606 is powered by whatever battery pack you connect up to it so the voltage will not exceed whatever your BAT voltage supplied to the part. Therefore, you do not need to worry about high voltage concerns if that is not how you intend to operate the device. In common automotive applications, these devices are stacked up to 400V+ so we are obliged to notify the user of these safety hazards. Generally, it is not considered HV if operating under 50V mark but ultimately it is up to the user to determine their safety needs based on the application and we can provide the tools to accomplish your goals such as the safety manual and other documentation. However, as always when working with Li-ion batteries, there is potential for high currents due to short circuiting of the batteries so it is important to understand the safety aspects that come with that and designing the system to protect against these issues.

    Regards,

    Taylor
  • 0 in reply to Taylor Vogt
    Intellectual 345 points
    Hi Taylor,

    Thanks for the detailed reply. That helped a lot and it was exactly what we were looking for.

    Regards,
    Milir
  • 0 in reply to Navin Babu S
    TI__Genius 17370 points
    Hi Milir,

    Glad it was helpful, please click the "This resolved my issue" button so we can close out the thread. Feel free to open a new thread if something comes up later on.

    Regards,

    Taylor