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BQ34Z100-G1: BQ34Z100-G1

Dalip Singh
Intellectual 380 points
Part Number: BQ34Z100-G1

I am following SLUA903 "Achieving the Successful Learning Cycle" for a LiIon battery.

I charge the battery after it had been relaxing for 5 hours. The FC bit is not being set even though SOC goes to 100%.

My charging current drops to 0 at the end of charging but FC bit is not set set.

What parameters should I be checking to figure out that would cause FC bit to be not set after charging is completed?

  • 0
    TI__Mastermind 42535 points
    FC set depends on either RSOC, or voltage thresholds reached after primary charge termination. Once you reach taper current and your chg I remains below taper current and you satisfy taper voltage, fc set can work.
  • 0 in reply to Batt
    Intellectual 380 points
    Batt,
    I am still in the fog about few things. So let me ask some basic questions.
    I have a LiIonphosphate battery with the following characterstics:

    Nominal Voltage: 12.8V
    Nominal Capacity: 4.5 Ah
    Energy: 57.6 Wh
    Charge Voltage: 14.4V
    Charger Current: 1A
    Discharge Cut-off Voltage: 10V

    From this, I conclude the following:
    Design Capacity: 4.5 Ah
    Design Voltage: 12.8

    The following data flash parameters is what I am struggling with...what or how these values are determined?

    Charge Term Taper Current: Not sure what this value is.
    Design Current Threshold: ?
    Chg Current Threshold:?
    Quit Current:?
    Term Voltage:?

    If you could point me in the right direction, how does one set or calculate these values?
    Thanks.
  • 0 in reply to Dalip Singh
    TI__Mastermind 42535 points
    Taper current is usually set to design capacity/10. So, around 450 or 400mA should be good.
    There is no design current threshold, if you are talking about discharge current, leave it as it is. Do the same for chg current and quit current as well. Those are IT parameters that you need not modify.
    Term voltage for an LFP is also called as discharge cutoff voltage in the cell datasheet, for eg if per cell it is 2.5V, then you should multiply it by the number of cells. For 1 cell it will be 2.5V, for 2 cells it will be 5V and so on.