The frequency for recalibrating a Coulomb Counter to ensure accurate State of Charge (SoC) readings in batteries depends on several factors, including the type of battery, the operating conditions, and the specific application. Generally, recalibration should occur under the following conditions:
- Change in Operating Conditions: Recalibration is necessary if the battery’s operating conditions change significantly, such as a switch from a low current to a high current scenario or a change in the power supply’s DC-DC mode.
- Fully Charged or Discharged States: For accurate SoC estimation, it’s beneficial to correct calibration when the battery reaches fully charged or fully discharged states, as these states are indicative of the battery’s capacity and health.
- Periodic Checks: Implementing routine checks or using interrupts can help determine if recalibration is needed based on the battery’s usage pattern or if the counter readings are inconsistent with expected values.
In practice, the exact interval for recalibration might not be fixed and should be determined based on the specific requirements of the system and how frequently it operates through different conditions.
Example Recalibration Scenarios:
- After Significant Current Changes: If the battery’s current draw shifts significantly.
- Upon Full Charge or Discharge: To ensure the accuracy of the SoC estimation at these critical points.
- Periodically Based on Usage Profile: Regular checks based on how the battery is used can help identify when recalibration is needed.
Overall, maintaining accurate Coulomb Counter readings requires monitoring battery conditions and adjusting the calibration accordingly to ensure reliable SoC estimations.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/how-often-should-a-coulomb-counter-be-recalibrated-to-ensure-accurate-soc-readings/
