What are fast charging and slow charging of automobile charging piles？

Hello, everyone, let’s talk today.What are fast charging and slow charging of automobile charging piles?? Automobile charging pile is the equipment to provide charging service. According to the charging power and charging time, it can be divided into two types: fast charging pile and slow charging pile. Then, what are the differences, advantages and disadvantages between fast-filling piles and slow-filling piles? Let’s compare it from the following aspects.

• Charging power and current type. The charging power of fast-charging piles is generally above 20kW, and some even reach 480kW. The output is that the battery can be directly charged without conversion. The charging power of slow-filling piles is generally below 7kW, and some of them are only 2.2kW. The output is that it is necessary to convert alternating current into direct current through on-board charger and then charge the battery.
• Charging time and efficiency. The charging time of fast charging piles is generally within 1-3 hours, and some even need only half an hour, which can quickly charge the battery or reach a certain amount of electricity. The charging time of slow filling pile is generally between 6-10 hours, and some even need all night, which is only suitable for use in the case of long parking time. The charging efficiency of fast-filling piles is generally above 90%, and that of slow-filling piles is generally around 80%, because there will be some loss when alternating current is converted into direct current.
• Charging cost and price. The charging cost of fast-filling pile is generally higher than that of slow-filling pile, because the construction cost, operation and maintenance cost and electricity price of fast-filling pile are higher than that of slow-filling pile. The price of fast-filling piles is generally between 0.8-2 yuan/kWh, and the price of slow-filling piles is generally between 0.4-1 yuan/kWh, which may be different in different regions and brands.

• Influence of charging on battery. The charging of fast-charging piles generally has a greater impact on the battery than that of slow-charging piles, because the charging current of fast-charging piles is large, which will lead to the increase of battery temperature, the increase of battery internal resistance, the acceleration of battery aging and the decrease of battery life. Generally, the charging of slow-filling piles has less influence on the battery than that of fast-filling piles, because the charging current of slow-filling piles is small, which will not cause excessive thermal stress to the battery, and the battery will age slowly and have a long life.

• Advantages of fast filling pile: The charging speed is fast, which saves time, is suitable for emergency or supplementary charging on the road, and improves the convenience and flexibility of electric vehicles.

• Disadvantages of fast filling pile: The charging cost is high, the price is high, and the damage to the battery is great, which reduces the use economy and reliability of electric vehicles.
• Advantages of slow filling pile: The charging cost is low, the price is low, the damage to the battery is small, and the use economy and reliability of the electric vehicle are improved.
• Disadvantages of slow filling pile: The charging speed is slow and time-consuming, and it is not suitable for emergency or supplementary charging on the road, which reduces the convenience and flexibility of electric vehicles.

That’s what I introduced to you. What are the fast charging and slow charging of automobile charging piles? From the comparison, it can be seen that fast-filling pile and slow-filling pile have their own advantages and disadvantages, and there is no absolute good or bad. It is necessary to choose the appropriate charging method according to different charging needs and scenarios. Generally speaking, fast filling piles are suitable for use in highways, gas stations, commercial centers and other places, while slow filling piles are suitable for use in families, communities, workplaces and other places. I’m Lao Zhang, a master mechanic for ten years. See you next time!