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EOC smooth current for bq27320

Cheng Wang
Prodigy 685 points

When enabled, the RSOC value is gradually increased to 100% instead of a sudden jump if the following is true:

(a) Battery is charging.

(b) Cell Voltage > Taper Voltage

(c) Charge Current is decreasing AND is below the EOC Smooth Current threshold for EOC Smooth Current Time.

In the dataflash , the unit for EOC Smooth Current is 0.1%.  

How to calculate the current threshold in mA?  Does that time Design capacity?

 EOC Smooth Current threshold(mA) =  0.1% * design capacity???

And how the smooth algorithm working , once FC set and RM is smaller FCC to filter the SOC to 100%, rather than sudden jump?

  • 0
    TI__Guru 61206 points
    Yes, the EOC smooth current is a percentage of the design capacity:

    EOC sc [mA] = DESIGN_CAPACITY[mAh] * EOC_SMOOTH_CURRENT * 0.1 / 100.0.

    For example: DESIGN_CAPACITY = 2000 [mAh]
    EOC_SMOOTH_CURRENT = 2

    EOC sc [mA] = 2000 * 2 * 0.1 / 100.0 = 4mA

    The smoothing will gradually increase the SOC until it's 100%. The actual implementation is proprietary.