Battery Calibration Notification Guide

Battery Voltage Curve and the Need for SOC Correction

The red curve in the image represents the battery’s voltage behavior during charging or discharging. The initial State of Charge (SOC) is typically estimated based on the Open Circuit Voltage (OCV), as the OCV curve remains mostly unchanged even as the battery ages.

However, in Lithium Iron Phosphate (LFP) batteries, the voltage curve remains very flat across most of the SOC range. This flatness makes it difficult to accurately estimate the initial SOC using only the OCV. If SOC is calculated solely by accumulating current without an accurate initial value, sensor errors will accumulate over time, leading to significant deviations from the actual SOC.

SOC is a critical parameter used for displaying charge level, managing power output, and predicting driving range. Therefore, it's essential to regularly correct these errors. This correction requires charging or discharging the battery into a region where the voltage responds more clearly to SOC changes. This process is known as Battery Level Calibration.

Battery Level Calibration and Dr.EV Notification Feature

Battery level calibration is generally recommended once a week or once a month, and it may require a full charge to perform properly.

Dr.EV automatically sends notifications when SOC correction is needed due to accumulated battery level errors.

To activate this feature, follow these steps:

Dr.EV App → More → Notification Settings → Enable 'Battery Calibration Required'

Once enabled, you will receive a notification when calibration is needed.

Tapping the notification will take you directly to the notification list screen, where you can view detailed information.