• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 210 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76930EVM: State of charge 100% although charge current is still 1A

Nati Spector
Prodigy 70 points
Part Number: BQ76930EVM
Other Parts Discussed in Thread: BQ76930, BQ78350-R1

Hi 

I am using 7S-1P battery and BQ76930EVM.

how come during charge process the BQ76930EVM present 1A charge current and SoC 100% ?

Nati

  

  • +1
    TI__Guru 54715 points

    Hi Nati,

    The BQ78350-R1 is the gauge on the BQ76930EVM.  It reads voltages and current from the BQ76930 and uses stored parameters to calculate a SOC.  Operation and configuration are explained in the BQ78350-R1 technical reference manual. 

    When you boot the circuit the BQ78350-R1 wakes up, reads cell voltages and from the stored chemistry information estimates the state of charge.  If the stored cell chemistry does not match your cells the estimate may be poor.  As the battery is charged the coulomb counter will measure the passed change which will be added to the state of charge.  The action of the FETs at full charge is configurable, see the technical reference manual for details.  There are many options.

    For your question some possibilities are:

    • The SOC estimate was not good and the battery can still accept charge when SOC has counted to 100%
    • The battery capacity entered (perhaps default) is much smaller than the actual battery attached
    • The FET settings are not as intended, although the charge voltage and current should be provided suitable for the battery, the BQ78350-R1 does not regulate charge.  If a smart charger is being used be sure the proper charge parameters are entered into the BQ78350-R1 so that they are available to the charger.