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

3.1.2 Load Select

Besides choosing the Load Mode, you need to choose a prediction method (determine the ‘const.’ in Equation 4 and Equation 5) by setting the Load Select parameter, which has following options.

  • Average discharge load from the previous discharge cycle:

    • The gauge calculates the average load from the previous discharge cycle and saves this in data memory (Avg I/P Last Run). Capacity simulations use this data (regardless of present load) for load prediction. Use this if the load profile is not known but not expected to change much between discharge cycles.

  • Present average load from the beginning of the current discharge cycle:

    • The gauge calculates the average load from the current discharge cycle and uses this for capacity simulations. Use this if the load profile not known but expected to change significantly between discharge cycles. This is the default setting.

  • Present load:

    • The gauge uses present load value for capacity simulations. Use this if the load profile varies little.

  • Present Average load:

    • The gauge uses present average load value for capacity simulations. Use this if the load profile varies little.

  • Low-pass filtered average load:

    • The gauge calculates a low pass filtered version of the average load and uses this for capacity simulations. Use this if the load profile is dynamic. This may lead to underestimation of capacity if the low pass filtered load is larger than the average load over the discharge cycle, causing SOC report 0% before Terminate Voltage.

  • Design Capacity / 5:

    • The gauge uses a C/5 load value for capacity simulations. Use this if the load profile is not known.

  • User Rate:

    • The gauge uses a fixed load value for capacity simulations. Use this if the load profile is very dynamic (choose the max load) and if underestimation of capacity is preferred over SOC jump.