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Have you ever wondered why the promise of ultra-fast charging for your electric car never seems to materialize? While manufacturers boast about their vehicles’ ability to reach impressive power peaks, the reality is often quite different. Discover why the charging curve is an essential element to understand to get the most out of your electric car.
The 3 key points not to miss
The charging curve represents how the charging power evolves while an electric car’s battery is connected to a station. This curve is not linear: it often starts with a power peak when the battery is low, then decreases as the battery fills up. This is due to the need to protect the battery and avoid overcharging.
To illustrate this phenomenon, let’s take the example of the XPeng G6 model, which reached a peak of 269 kW during a fast charging test. However, this peak was recorded when the battery was only 40% charged. When charging starts at a lower level, the power can be more stable and prolonged.
Manufacturers often highlight the maximum charging power in their communications. However, it is the average power that really determines how quickly your vehicle charges. A car whose battery is designed to accept fast charging will see its power decrease as the battery level increases. Thus, the announced maximum power is rarely reached in real conditions, especially if the battery is not at its optimal temperature.
To optimize your charging experience, it is advisable to keep the charge level between 10% and 80%. Beyond this threshold, the charging power drops drastically, making continued charging inefficient.
The battery management system plays a crucial role in ensuring the safety and performance of charging. It regulates the temperature and power admitted, preventing the battery from overheating or discharging too quickly. For example, in cold weather, energy is often first used to warm up the battery before charging actually begins.
Some electric cars allow the battery to be pre-conditioned before reaching a fast charging station. This can be done automatically based on the destination or manually by the user, thus ensuring optimal conditions for charging.
As manufacturers continue to develop more efficient charging technologies, a major challenge remains optimizing the thermal management of batteries. Upcoming innovations could include more advanced cooling systems or battery materials more resistant to temperature variations. Following these trends will be essential to understand how fast charging will evolve in the coming years.