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BQ7718: companion protection for BQ40Z80

Hanno Reimer
Intellectual 1930 points
Part Number: BQ7718
Other Parts Discussed in Thread: BQ40Z80, BQ77915

on our BQ40Z80EVM we implemented two BQ771807 as independent secondary overvoltage protection. The BQ40Z80 already brings the primary overvoltage protection. is the second level protection mandatory for Li-Ion battery packs (5s)? The application is a consumer audio device. 

  • 0
    TI__Expert 7465 points

    Hi Hanno,

    I'm not entirely sure, but I do not believe there is any law or regulation that requires two levels of protection. Generally, it is good practice because it ensures customer and device safety.

  • 0 in reply to Shawn Hinkle
    Prodigy 20 points

    Hi,

    when it is a good practice to have two levels of protection, why is there then only an overvoltage protection? Is overvoltage more critical then other protection mechanism?

  • 0 in reply to Sebastian Wolf1
    TI__Expert 7465 points

    Hi Sebastian,

    Personally, I believe it is "better to be safe than sorry" and always endorse protection. Yes, over voltage is the most critical protection because it can lead to catastrophic failures. Usually, the system has either a battery gauge or charger that can act as a primary protector and includes under voltage, temperature, and current faults. However, we do have more advanced protectors such as the BQ77915 that include all of those protection features.