SBAA885 October   2026 BQ76907-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Passive Balancing Mechanism of BQ76907
    1. 2.1 Balancing Current Path
    2. 2.2 Balancing Current
    3. 2.3 Balancing Time Estimation
  6. 3Particularity of Supercapacitor Systems
    1. 3.1 ESR and Voltage Recovery Effect
    2. 3.2 Impact on Balancing Strategy
  7. 4Balancing Scheme Design
  8. 5Reference Algorithm Implementation and Example
    1. 5.1 Algorithm Flow and Pseudocode
    2. 5.2 Design Example
  9. 6Conclusion
  10. 7References

2.2 Balancing Current

The balancing current is approximately:

Equation 2. I b a l , n ≈ V c e l l , n R b a l , n

Wherein:

  • Vcell,n is the cell voltage
  • Rbal,n is the balancing branch resistance

For the same balancing resistor, high-voltage cells have a larger balancing current. Therefore, when multiple cells are balanced simultaneously, the voltage change rate of high-voltage cells is significantly faster than that of low-voltage cells.