SLUAA45 April   2020 BQ27Z561

 

  1.   End of Discharge SOC Jump Elimination
    1.     Trademarks
    2. 1 Introduction
    3. 2 Improve Battery Modeling
      1. 2.1 Improve Battery Modeling -- Get Matched ChemID
      2. 2.2 Improve Battery Modeling -- Use GPCRB Tool to Optimize Low-Temperature Performance
    4. 3 Optimize Gauge Configurations
      1. 3.1 Optimize Gauge Configuration -- Load Prediction
        1. 3.1.1 Load Mode
        2. 3.1.2 Load Select
        3. 3.1.3 Discharge Current Threshold and Quit Current
      2. 3.2 Optimize Gauge Configuration -- Enable Smoothing to 0% in Discharge Mode
      3. 3.3 Optimize Gauge Configuration -- Enable Fast Resistance Scaling
      4. 3.4 Optimize Gauge Configuration -- EDV in Steep Zone
    5. 4 Achieve Successful Ra Table, Qmax and DOD0 Learning
      1. 4.1 Complete a Learning Cycle to Update Ra Table and Qmax
      2. 4.2 Add a Dedicated Relaxation to Update DOD0
    6. 5 References

4.1 Complete a Learning Cycle to Update Ra Table and Qmax

The learning cycle is needed for the gauge to update the resistance (Ra) table and total chemical capacity (Qmax). You need to carry out a charge-relax-discharge-relax cycle. This is a part of the firmware creation process in order to get an accurate initial Ra and Qmax. The following procedure must be followed:

  1. Discharge the cell to empty for at least 5 hours.
  2. Charge the cell to full and let it relax for at least 2 hours.
  3. Discharge the cell to empty using typical discharge rate of your application. It must between C/5 to C/10 rate.
  4. Let the cell relax for 5 hours.