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CHARGING CURRENT is too low ?

Chairun
Intellectual 360 points
Other Parts Discussed in Thread: BQ40Z50, BQ24735

Hi, 

I am using BQ24735, BQ40z50 combination to charge and monitor battery of 2200mAh of 0-4.2V ( 3.7V )

I desgined Battery capacity - 2200mAh, Voltage - 14800mV, standard low charge current - 1024mA and High current to 1500mA.

It is showing Full charge capacity as 2163mAh why ?

After 80% it takes very much less current to charge, i.e.. 100mA gradually decreases for 89% it is taking 27mA to charge. (It takes so much time to charge in this current). So please suggest me, how to solve this problem.

  • 0
    TI__Guru 73830 points
    You are having a lot of problems trying to get the gauge / charger solution to work. I would try using the gauge and a power supply any get them to work properly and then add the charger to the setup. The charger device may not be configured properly.

    Are you concerned that the FCC is too low at 2163mAh? Remember that FCC will always be less than QMax and probably the Design Capacity. FCC is the usable capacity that accounts for losses such as the series resistance, temperature, etc.
  • 0 in reply to ThomasCosby
    Intellectual 360 points
    OK, Please guide me, where i went wrong in configuration.

    Adapter Voltage using is 17500mV (0-4A). Charging current and voltage applying is 16000mV and 1024mA.
    Gauge Design Voltage - 14800mV and Capacity - 2200mAh.
    Chemistry ID - 0x3596 (2600mAh)
    Battery Cells - 2200mAh(4.2v)
  • 0 in reply to Chairun
    Intellectual 360 points

    Answer :

    Apply charging voltage to 16800mV (4200x4cells). All Problems solved.

    Charging current is there as per my design. ofcourse, with respect to load