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BQ40Z80: How to make BQ40Z80 support higher current?

v one
Prodigy 140 points
Part Number: BQ40Z80

My battery is 7P6S, 12600mAh, and the sampling resistance is 1 mOhm. The BQ40Z80 only supports a maximum current of 32767mA. I need an instantaneous discharge current of 100-150A. Let's say I scale 5x. Is the following process right?
1) Use the standard 2A current to correct the current value.


2) The design capacity is set to 2520mAh.


3) Set the current scaling factor to 5.

  • 0
    TI__Guru 52115 points

    Hello V one,

    The current scaling you mention may work, but I recommend considering the lower end of the spectrum of your system discharge as well. Now 1 mA may get scaled to 20 mA with a scale of 20, but it means any noise will register higher current count. You also need to scale your design capacity, qmax values smaller if you are to scale the current.

  • 0 in reply to Andy Liu (BMS)
    Prodigy 140 points

    ，

    My purpose is to scale the current because the BQ40Z80 cannot exceed 32767mA. If I need to scale the current 5 times, can you give me a specific operation procedure? The more detailed the better, thank you very much!

  • 0 in reply to Andy Liu (BMS)
    Prodigy 140 points

    I did some experiments, it seems that I only need to set Setting-> Current Scaling to 5 to scale the current value by 5 times. And because the design capacity does not exceed 29AH, it is still 12600mAH without modification. Then some other parameters related to current need to be modified, such as OCC1 \ OCC2 \ OCC \ OCD1 \ OCD2 \ OCD \ CHGC \ PCHGC in Protections. Is that right?

  • 0 in reply to v one
    TI__Mastermind 24870 points

    Hello V One,

    Yes, also the other parameters such as charge current threshold, discharge current threshold, design capacity, quit current, sleep current should be modified.