SLUAAR3 December   2023 BQ27426 , BQ27427 , BQ27Z561 , BQ27Z746 , BQ28Z610 , BQ34Z100 , BQ40Z50 , BQ40Z80

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Voltage Correlation
  6. 3Voltage + IR Correction
  7. 4Coulomb Counting
  8. 5CEDV
  9. 6Impedance Track
  10. 7Algorithm Comparisons
    1. 7.1 Calculating SOC Error
      1. 7.1.1 Calculating True SOC
      2. 7.1.2 Finding Calculated SOC for Voltage Correlation & Voltage + IR Correction
      3. 7.1.3 Finding Calculated SOC for Coulomb Counting
    2. 7.2 Comparing SOC Error
  11. 8Summary
  12. 9References

8 Summary

Impedance Track offers the highest accuracy battery gauging when compared to other commonly used algorithms. While voltage correlation is the simplest method to implement, Impedance Track offers the largest SOC error. Voltage + IR correction is shown to reduce the peak SOC error from voltage correlation in half, and coulomb counting can further reduce the SOC error. Impedance Track offers the most accurate gauging because it uses all three of these algorithms. The largest benefit to using an accurate gauging algorithm is that it can increase the run time of the application.