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RTOS/BQ40Z50: CB behavior and timer. Qmax calculated for CB byass Q

CHIU Astin
Prodigy 50 points
Part Number: BQ40Z50

Tool/software: TI-RTOS

We verify the CB and CBR function, and have some questions as below :

(1)    In relax mode, the CBR will pause while OCV measurement.  After OCV taken, balance timer set to 0 and then updated. 

We would like to know more about the behavior,  such as whether “OCV measurement” rule be the same CBR disable ?   

How much time will the CBR pause ?

 

(2)    Would the “Bypass Q” affect “Passed Q” for Qmax calculation ?

  • 0
    TI__Expert 4640 points
    Hi Chiu,

    We have assigned this to someone and will get back to you shortly.

    Thanks

    Miguel
  • 0 in reply to Miguel Angel Rios
    TI__Expert 4645 points
    Hello,

    The OCV measurement rule is the same and does not depend on CBR bit. Typically it takes between 30 minutes and 2hrs for the dv/dt condition to be met for OCV measurement, but it can take up to 5hrs for the OCV if dv/dt condition is not met and the OCV is forced due to timeout. So, it is possible for Cell Balancing to be disabled for up to 5 hrs. Typically we see the cell balancing stopped for about 30 minutes.

    The "Bypass Q" is not taken into account for Qmax calculation.