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Original question:

li-ion battery parallel cell fuel gauge

BQ34Z100: How to use TI Impedance Track™︎ Technology for a chain of multiple battery packs without using multiple sense resisters

Elazar Moshkovits
Prodigy 10 points
Part Number: BQ34Z100


Hi,

How can we design a system that connects in series multiple battery packs of 16S to get a very high voltage >400V but we only want to use one current sense resister to reduce power loss,

The system will be designed as a master with multiple slaves, each slave will work with a BQ34Z100 chip, (because we want to use the Impedance TrackTm Technology)

The master will read and write to all the slaves.

Is there any Impedance TrackTm Technology-based chip that can help us with our design requirements?

Best Regards.

  • +1
    TI__Genius 11770 points

    Hello Elazar,

    One way you could accomplish this is to just use one BQ34z100 and scale the voltage based on this guide https://www.ti.com/lit/an/slua760/slua760.pdf. However, scaling 400V down to <65V would require a scaling factor >6, so the accuracy will be hurt somewhat. However, you would only need one sense resistor. Another option would be to use a stackable monitor like these. Stacking BQ34z100s like you suggest is going to cause problems and we don't recommend it. Especially because the other options will likely give better results anyways. 

    thanks,

    Alex M.