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Original question:

BQ79616: Some Question About BQ79616 and BQ79600

BQ79616: Resistive cables connecting battery cells to BMS IC

Abbas abs
Prodigy 30 points
Part Number: BQ79616

Tool/software:

Hello,

What would be the consequences of having resistive cables connecting the IC BMS with the battery cells? Voltage drop for sure..

Will this affect the performance even if balancing and measuring are NOT done at the same time?

I am concerned about the GND connection between the PCB and the battery pack? For instance, is 1 [Ohm] between those 2 grounds acceptable regarding voltage drop? 

All I can find in the datasheet is the following information: CB0, VC0 to AVSS –0.3(min) 5.5 V(max)

Thank you in advance,

Abbas

  • +1
    TI__Expert 7020 points

    Hello Abbas,

    The effects of higher resistance harnesses are:

    1. An increase in the voltage drop to the VC/CB/BAT pins and a voltage drop to the RNPN resistor. This would result in the cell voltage readings being smaller. 

    2. More resistance will slightly reduce cell balancing current.

    3. More resistance slightly reduces hotplug current

    As for the 1 ohm between grounds, it would always be preferrable for this to be a smaller resistance but the main effect would be that it increases the total current consumption of the IC. 

    Regards,

    David