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

8.3 Learning Cycle Steps

The hardware setup for performing a learning cycle consists of the same setup as used in the Chemical ID process. This setup is described in Section 8.2 and shown in Figure 8-2. The charging and discharging process is very similar to a ChemID, except the first step is an initial discharge of the battery to its terminal voltage.

Before beginning the learning cycle process, starting a log in bqStudio is recommended to allow for debugging of any issues that might occur during the learning cycle.

Conducting a learning cycle consists of the following steps:

  1. Test is performed at room temperature. If the cell was at a different temperature, let the cell relax for two hours at room temperature prior to the test.

  2. Use the GAUGE_EN command in the Command window. Use the RESET command in the Command window. Confirm that the [LStatus] register has updated to 0x04.

  3. Discharge the battery at C/5 until it reaches Term Voltage.

  4. Relax the battery for 5 hours.

  5. Charge using CC until the battery reaches the Full Charge Voltage.

  6. Charge using CV at the Full Charge Voltage. Cut off CV charging at a point in between [CHG Current Threshold] and [Quit Current Threshold].

  7. Let the battery relax for two hours to reach full equilibrium open circuit voltage (OCV). The [LStatus] register should update to 0x05.

  8. Discharge the battery at C/10 rate until the [Term Voltage] is reached.

  9. Let the battery relax for five hours to reach full equilibrium OCV. The [LStatus] register should have updated to 0x06.