SLUUCW4 November   2023 BQ27Z558

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Hardware Setup
      1. 2.1.1 Hardware Requirements
      2. 2.1.2 Connecting the BQ27Z558 Circuit Module to a Battery Pack
      3. 2.1.3 EVM Jumpers Description
    2. 2.2 Chemical ID
      1. 2.2.1 Chemical ID Selection Process Description
      2. 2.2.2 Hardware Requirements and Setup
      3. 2.2.3 Logging Data in bqStudio
      4. 2.2.4 GPCChem Tool
      5. 2.2.5 Programming a Chemical ID
      6. 2.2.6 Further Resources for Chemical ID Process
    3. 2.3 Calibrating Gauge Measurements
      1. 2.3.1 Voltage Calibration
      2. 2.3.2 Current Calibration
    4. 2.4 Learning Cycle and Golden Image
      1. 2.4.1 Learning Cycle Process Description
      2. 2.4.2 Data Memory Configuration
      3. 2.4.3 Learning Cycle Steps
      4. 2.4.4 Low Temperature Optimization
      5. 2.4.5 Creating the Golden Image File
      6. 2.4.6 Programming the Golden Image File
    5. 2.5 BQ27Z558-Based Circuit Module
      1. 2.5.1 Circuit Module Connections
      2. 2.5.2 Pin Description
  8. 3Software
    1. 3.1 Software Setup
      1. 3.1.1 System Requirements
      2. 3.1.2 Software Installation
    2. 3.2 Troubleshooting Unexpected Dialog Boxes
    3. 3.3 Using bqStudio
      1. 3.3.1 Starting the Program
      2. 3.3.2 Setting Programmable BQ27Z558 Options
    4. 3.4 Gauge Communication
      1. 3.4.1 Advanced Communication in bqStudio
      2. 3.4.2 Standard Data Commands
      3. 3.4.3 Manufacturer Access Commands
      4. 3.4.4 Further Resources on Gauge Communication
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Material
  10. 5Additional Information
    1.     Trademarks

2.4.3 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 2.2.2 and shown in Figure 2-3. The charging and discharging process is very similar to a ChemID, except the first step is an initial discharge of the battery to the terminal voltage.

Before beginning the learning cycle process, starting a log in bqStudio is recommended to allow for debugging of any issues that can 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, then 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 the battery 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].
  7. Let the battery relax for two hours to reach full equilibrium open circuit voltage (OCV). The [LStatus] register updated 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 has updated to 0x06.