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:
- 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.
- 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.
- Discharge the battery at C/5 until the battery reaches term voltage.
- Relax the battery for 5 hours.
- Charge using CC until the battery reaches the Full Charge Voltage.
- Charge using CV at the Full Charge Voltage. Cut off CV charging at a point in between [CHG Current Threshold] and [Quit Current].
- Let the battery relax for two hours to reach full equilibrium open circuit voltage (OCV). The [LStatus] register updated to 0x05.
- Discharge the battery at C/10 rate until the [Term Voltage] is reached.
- Let the battery relax for five hours to reach full equilibrium OCV. The [LStatus] register has updated to 0x06.