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

3.1.1 Load Mode

The gauge provides various load options in data flash. It has two load prediction models (Load Mode) as shown in Equation 4 and Equation 5:

  • Constant Current:
    • Equation 4. sluaa45-equaton-4.gif

    Capacity simulations use a constant current, regardless of simulated cell voltage. This is the default setting.

  • Constant Power:
    • Equation 5. sluaa45-equaton-5.gif

    Capacity simulations use a variable current as a function of simulated cell voltage. The current is adjusted automatically so that the simulated power drawn from the battery is constant.

Normally, Constant Current is chosen, but it is application dependent. If the application load file more closely matches a constant power model, then choose Constant Power.