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analysing and testing bq2060A charging/discharging

GIRISH GUJAR
Prodigy 100 points
Other Parts Discussed in Thread: BQ2060A

Hello sir,

    i have recorded charging and discharing data coming from BQ2060A evm. i have one question in discharge section.

     i have observed 2-3 times that mAH (battery capacity) i.e. RM(remaining capacity) stops during discharging (after 11 volt )and after 10.7 volt it starts decreasing. i want to know the reason behind this behaviour of battery.  i have marked with red color of Rm value on which i have doubt.

Please reply.

battery 2 discharging_2.xlsx

  • 0
    Prodigy 100 points
    Battery releated eeprom data as follows:

    VOC 25%=11500
    VOC 50%=12000
    VOC 75%=12500
    EDVF/EDV0=10000
    EMF/EDV1=10500
    EDV T0 Factor=0
    EDV2=10700
    EDV C0 Factor=460
    EDV C1 Factor=5
    EDV R0 Factor=0
    EDV R1 Factor=0
  • 0 in reply to GIRISH GUJAR
    TI__Expert 6470 points

    Hi Girish,

    The "hold" at 7% RSOC is part of the CEDV learning process. Note that 7% is the default value for EDV2 and "Battery Low Percent". This is the point where the gauge attempts to learn its capacity as long as all conditions are right. If you take a look at the bq2060A datasheet, you can find a pretty clear explanation for all of this. Basically, if the gauge arrives at the 7% RSOC point BEFORE the voltage has decayed to the expected value for 7%, then the gauge will remain at 7% until the proper voltage corresponding to 7% is reached.

    Hope its clear. Please see the datasheet.

    Regards,

    Doug