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BQ40Z50_R1 Qmax不更新

有个问题想请教下TI大神们:

 用BQ40Z50_R1作4串磷酸铁锂电池的电量计,开始cell0-cell3的Qmax填的是10000mAH,从放空到充满,FC置位,静置2小时,Qmax没更新,但是FCC更新了,从9989更新到9952,为啥Qmax不更新,请问这是什么原因,如果Qmax不更新会影响什么,请帮忙解答,谢谢!

Star Xu:

A QMax update is disqualified under the following
conditions:
Temperature — If Temperature is outside of the range 10°C to 40°C.
Delta Capacity — If the capacity change between suitable battery rest periods is less than 37%.
Voltage — If CellVoltage4..1 is inside a flat voltage region. (See the Support of Multiple Li-Ion
Chemistries with Impedance Track Gas Gauges Application Report (SLUA372) for the voltage
ranges of other chemistries.) This flat region is different with different chemistry. The
GaugingStatus[OCVFR] flag indicates if the cell voltage is inside this flat region.
Offset Error — If offset error accumulated during time passed from previous OCV reading exceeds 1% of
Design Capacity, update is disqualified. Offset error current is calculated as CC Deadband / sense
resistor value.
Qmax会影响FCC,RSOC等

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