SLUUCH4A October   2021  – October 2023 BQ27Z746

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Software Setup
    1. 1.1 System Requirements
    2. 1.2 Software Installation
  5. 2 Troubleshooting Unexpected Dialog Boxes
  6. 3 Hardware Setup
    1. 3.1 Hardware Requirements
    2. 3.2 Connecting the BQ27Z746 Circuit Module to a Battery Pack
    3. 3.3 EVM Jumpers Description
  7. 4 Using bqStudio
    1. 4.1 Starting the Program
    2. 4.2 Setting Programmable BQ27Z746 Options
  8. 5 Calibrating Gauge Measurements
    1. 5.1 Voltage Calibration
    2. 5.2 Current Calibration
  9. 6 Protections
    1. 6.1 Protector Calibration in bqStudio
    2. 6.2 Protector Threshold Process
  10. 7 Chemical ID
    1. 7.1 Chemical ID Selection Process Description
    2. 7.2 Hardware Requirements and Setup
    3. 7.3 Logging Data in bqStudio
    4. 7.4 GPCChem Tool
    5. 7.5 Programming a Chemical ID
    6. 7.6 Further Resources for Chemical ID Process
  11. 8 Learning Cycle and Golden Image
    1. 8.1 Learning Cycle Process Description
    2. 8.2 Data Memory Configuration
    3. 8.3 Learning Cycle Steps
    4. 8.4 Low Temperature Optimization
    5. 8.5 Creating the Golden Image File
    6. 8.6 Programming the Golden Image File
  12. 9 Gauge Communication
    1. 9.1 Advanced Communication in bqStudio
    2. 9.2 Standard Data Commands
    3. 9.3 Manufacturer Access Commands
    4. 9.4 Further Resources on Gauge Communication
  13. 10BQ27Z746-Based Circuit Module
    1. 10.1 Circuit Module Connections
    2. 10.2 Pin Descriptions
  14. 11Circuit Module Physical Layout, Bill of Materials, and Schematic
    1. 11.1 Board Layout
    2. 11.2 Schematic
    3. 11.3 Bill of Materials
    4. 11.4 BQ27Z746 Circuits Module Performance Specification Summary
  15.   Revision History

8.4 Low Temperature Optimization

Gauge State of Charge (SOC) reporting often loses accuracy in low temperatures due to higher cell impedances. Impedance Track gauges allow SOC reporting to be improved significantly for gauges that will experience low temperatures by using the GPCRB Tool. This simple test requires a similar process to the Chemical ID process, but adds a much greater degree of accuracy for low temperature gauging.

The test setup required to use the GPCRB Tool is very similar to the setup shown in Figure 8-2. The only difference is that the EVM thermistor must be connected to the surface of the battery and a temperature-controlled chamber, such as Arbin or Maccor, is required to create a low-temperature environment where the gauge can monitor the battery’s IVT characteristics.

For more information about this process, see the GPCRB page on ti.com.