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Bq34z100-g1 question regarding scaling factor and design energy field

matt kinberger
Prodigy 50 points
Other Parts Discussed in Thread: BQ34Z100-G1

Greetings,

16s2p lithium.  57.6V 5.6Ah

I am setting up a BQ34Z100-G1 with a battery pack.  I have determined that I need a scale factor of 2 for the battery voltage parameter, and set the scaled bit and volsel bit, and understand calibrating voltage at divide by two and setting number of cells parameter at divide by two as well.

My pack capacity 5660 mAh and max current 26A is less than max gauge parameters, so I don't need to scale them necessarily.

My question is that since I am scaling volage, do I have to scale current/capacity?

And there is a parameter in the gauge setup "Design Energy" in mWh.  57.6V nominal x 5660 mAh = 326016 mAh.  I would have to scale this by 10 to fit?

-thanks

  • 0
    TI__Guru 73830 points
    Matt
    You do not need to scale the current as long as the current and capacity do not exceeded 32A and 29Ah, respectively. The Design Energy is set at a cell level on the bq34z100-G1, so you would you will set the Design Voltage to 3.6V and the Design Energy 3.6V x 5660 mAh = 20376mAh. You will not have to scale voltage parameters, since you are scaling the number of series cells (set to 8S) and calibrating the pack to 1/2 the applied voltage. The gauge will scale the voltage to the normal cell voltage internally.
    Tom
  • 0 in reply to ThomasCosby
    Prodigy 60 points

    Hello Thomas,

    I'm using 12V 150Ah battery.Single cell voltage is 2V.

    Voltage divider : 12800mV

    Q Max cell : 150Ah/6 cells = 25000mAh

    Design Capacity : 150000mAh / 29000mAh = 5.17. That means rounded to 5x.

    Design Energy : (12V * 150000mAh ) / 6 cells =  300000mWh

    300000mWh >32767mWh.

    So My design Energy scale is 10

    Finally Design Energy : 300000/10 = 30000mWh

    Is my whole Calculations are correct....?