There seem to be many people curious about the reasons behind the sudden changes in battery charge and driving range, so I would like to explain this part.
Battery Charge Measurement Method
Battery charge can change rapidly during driving due to temperature and the required power. This rapid change is more likely to occur in low charge ranges.
Total Driving Range
The total driving range can reflect the driver's usual driving habits. For example, if the driver’s efficiency is typically 7 km/kWh, then with a 100 kWh pack, the total driving range would be 700 km.
Current Driving Range
The current driving range can be calculated based on the remaining capacity, which takes into account the SOH (State of Health), temperature, output, and other factors, combined with the driver’s current efficiency. For instance, if the remaining capacity is 1 kWh and the current efficiency is 5 km/kWh, the current driving range would be 5 km.
However, the problem is that both the accuracy of the current remaining capacity and the driver’s current efficiency can change rapidly. Especially when the battery charge reaches 0%, even though it is calculated as having no remaining charge, the vehicle may still be drivable if the actual voltage hasn’t yet reached the termination voltage. This is why some drivers can continue driving even after the charge is shown as 0%.
After Reaching 0%
After reaching 0%, if the power demanded by the vehicle decreases, the voltage may rise, increasing the SOC (State of Charge), but the value displayed to the user does not increase due to reliability concerns. However, in such cases, the actual driving range may increase even though the SOC remains at 0%."
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