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BQ34Z100-G1: Charging and Charge Termination Indication

Karlis Tucs
Expert 1385 points
Part Number: BQ34Z100-G1

Hi. I have noticed that FC flag is set when the battery is not really fully charged. 

I want my battery to stop charging when its voltage is 16,8V and current has dropped to 1A. So the parameters of the gauge are : taper voltage - 250mV, taper current - 1A, taper capacity - 5 mAmphr

What I noticed is that the Fc flag is set when voltage of battery is 16624mV, current is 1,6A and the capacity change in last 2 cycles(40sec x 2) is 9mAh. So I guess the Fc flag is not set by these taper parameters.

Questions:

1. Does taper termination occurs if all 3 A, B and C occurs or it needs only one of them to set Fc flag?  Picture below:

2. How can I know which of these 3 (taper, delta temperature, negative delta voltage) ways sets the Fc flag?

3. How can I disable the delta temperature and negative delta voltage so it does not set the FC flag?

Thanks in advance.

Karlis 

  • 0
    TI__Guru 73830 points
    Karlis
    I checked a gg file that you sent earlier and FC Set% was set to 100. This will set the FC flag when SOC reaches 100%. You can set FC Set% = -1 and FC should set at charge termination. The taper current not be set higher than C/20 to allow the cells to fully charge. The deltaT and deltaV parameters only apply when using NiMH and NiCd ChemID's.
    Tom
  • 0 in reply to ThomasCosby
    Expert 1385 points
    we are using 4S18P and 4S36P ncr18650b cells.
    For 4S18P it gives around 1A termination current.
    We do not manufacture these battery packs our selves.
    Ok, thank you, I now understand about the deltaT and deltaV.
    I will try to set FC Set%=-1 and see how it works. Thank you!