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BQ4050: The self-discharge mechanism of the BQ4050

zehu chi
Intellectual 445 points
Part Number: BQ4050

     

 Hello, TI engineer. I have a few questions about self-discharge of battery pack that I haven't figured out by myself. I hope to get professional answers 

  • 1. What is the self-discharge mechanism of the battery pack?
  • 2. In what state can the self-discharge logic be triggered?
  • 3. If the self-discharge condition is triggered, how low will the battery pack charge go?
  • 4. To what value will SOC be reduced? Or will it go down to zero?

Yours sincerely！

  • 0
    TI__Guru** 105770 points

    Hello Zehu,

    Self discharge is a parameter you can configure that will account for the continuous discharge of the cell over time when there is no active discharge occurring. You will need to edit it based on your specific cell.

    If the battery remains in sleep state for long enough it can cause the SOC to go to the EDV points, SOC should hold until the voltage reaches the EDV point. The SOC can also drop down if the EDV point is reached before SOC from self discharge as reached that EDV point yet. As mentioned in the TRM this correction only occurs if you get current above C/32.

    Sincerely,

    Wyatt Keller