What's the difference between fast charging and slow charging for electric charging stations?

Fast charging and slow charging are relative concepts. Generally, fast charging involves high-power DC charging, which can reach 80% of the battery capacity in half an hour. Slow charging refers to AC charging, which takes 6-8 hours to complete. The charging speed of electric vehicles is closely related to the charger's power, battery charging characteristics, and temperature.

At current battery technology levels, even with rapid charging, it takes 30 minutes to charge the battery to 80% capacity. After that, to ensure battery safety, the charging current must be reduced, which extends the time needed to fully charge. Additionally, during the winter months when temperatures are lower, the battery requires less charging current, resulting in an increased charging time.

A vehicle can have two charging ports due to two charging modes: constant voltage and constant current. Generally, constant current and voltage are used for higher charging efficiency. Fast charging is caused by different charging voltages and currents, with higher currents resulting in faster charging. When the battery is about to be fully charged, switching to constant voltage prevents overcharging and protects the battery.

Whether it's a plug-in hybrid or an electric vehicle, the car will be equipped with an onboard charger, allowing for direct charging at 220V power outlets. This method is typically used for emergency charging and is relatively slow. What we commonly refer to as "flyline charging" (i.e., pulling a wire from a 220V power outlet in high-rise residential buildings to charge the vehicle with the car's charger) poses significant safety risks, and we do not recommend this method for vehicle charging.

Currently, there are two specifications of vehicle connectors for 220V household power outlets: 10A and 16A. Different models come with different connectors—some with 10A, others with 16A. The 10A connector matches our standard household appliance specifications with smaller pins. The 16A connector has larger pins, similar in size to the empty outlets at home, making it less convenient to use. If your car is equipped with a 16A vehicle charger, we recommend purchasing an adapter for ease of use.

How to Distinguish Between Fast and Slow Charging Piles

Firstly, the fast and slow charging interfaces for electric vehicles correspond to DC and AC interfaces, respectively, with DC fast charging and AC slow charging. Generally, fast charging has 5 interfaces, while slow charging has 7. Additionally, you can also see the difference between fast and slow charging from the charging cable, with the fast charging cable being thicker. Of course, some electric vehicles, due to considerations such as cost and battery capacity, only have one charging mode, resulting in a single charging port.

Quick charging, with fast charging capabilities, but complex site construction and high costs. Rapid charging typically involves direct current (DC) power directly to the vehicle's battery (which can also be AC). In addition to power from the grid, rapid charging stations should be equipped with rapid chargers. More suitable for users to top up during travel, but not every household can afford fast charging installation, so for convenience, the vehicle is equipped with slow charging functionality. Also, considering costs and to increase coverage, there are a large number of slow charging stations.

Slow charging utilizes the vehicle's built-in charging system for a gradual charge. Slow charging is beneficial for the battery, ensuring a full charge. Moreover, the construction of charging stations is relatively simple, requiring only ample power sources. No additional high-current charging equipment is needed, making the entry barrier low. It's very convenient for home use, as charging can be done anywhere there is power.

It takes approximately 8-10 hours for a slow charge to fully charge the battery. Fast charging delivers a higher current, up to 150-300 Amps, and can charge 80% in about half an hour, making it more suitable for mid-way charging. Of course, high-current charging can slightly impact battery lifespan. To enhance charging speed, rapid filling stations are becoming more prevalent! Post-construction charging stations are predominantly fast-charging, with slow-charge stations in some areas no longer being updated or maintained; upon damage, they are directly charged.