The power of an
Ev Charging Station is an important parameter that determines the rate of energy replenishment, but the charging power is not constant. The charging process is divided into two stages: constant current charging and constant voltage charging. After the battery level exceeds 80%, the charging speed significantly slows down.
At the beginning of charging, the battery voltage is low, and the BMS allows for high current input. The Ev
charging station maintains a constant current output, resulting in high power. During this stage, the battery capacity increases the fastest.
When the battery level approaches 80% and the cell voltage gradually reaches the upper limit, in order to prevent overcharging and damage to the battery, the BMS reduces the charging current and enters the constant voltage stage, and the charging power continues to decline.
This mechanism is a power battery protection strategy, not a shortage of
Flexible Charging Stack. At the same time, the maximum power that the vehicle can receive is limited by the on-board charger and battery pack itself. Even if a 250kW supercharging station is matched, if the maximum charging power of the vehicle battery is only 100kW, the actual charging maximum can only reach 100kW.
In low temperature environments, battery activity decreases, and BMS will actively limit power, requiring preheating of the battery and reducing charging speed. The household 7kW AC pile has stable power and small variation throughout the entire process, making it suitable for long-term slow charging.
Choosing an Ev Charging Station should not only consider the nominal peak power, but also take into account the vehicle battery platform. It is recommended to stop recharging when the high-speed charging reaches 80%, balancing charging efficiency and battery health, and reducing the losses caused by long-term high-power charging.
