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BQ20Z70: Cell Balancing and Qmax Cell

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Part Number:BQ20Z70

Hello,

I'm now trying to generate the golden file for 3S3P battery pack, 7800 mAh, 11.1V typ.

I have two concerns about the work.

  1. When I charge and discharge the battery pack, I can see more than 150mV of the different voltage level gap between maximum and minimum.
    • This should be less than 100mV, what parameters I need to check in order to get this target value?
    • I set the Min Cell Deviation to 1314, = dQ *R / (V * duty cycle) = 3600*540/(3700*0.4). 
  2. The values of Qmax Cell 0/1/2/Pack kept changing to the overcapacity of the battery pack.
    • Initially, I set the values of each parameter to 7800 (mAh), and the values were changed to 8445/8456/8450/8445.
    • What can cause this change?

Thanks,

Sherard Yu

 


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