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The correct method of charging new energy vehicles

Date:2022-05-21   Author:XINDA MOTOR

The correct method of charging new energy vehicles and the precautions for charging new energy pure electric vehicles

In recent years, the popularity of pure electric vehicles has become higher and higher, and the charging of new energy vehicles has become the daily demand of electric vehicle owners. What knowledge points should car owners know about the charging of new energy pure electric vehicles? Let's take a look at the new energy vehicle charging methods and precautions.

New energy pure electric vehicle charging method

At present, the charging methods of electric vehicles include slow charging, fast charging, battery swapping, wireless charging and mobile charging, but the vast majority of electric vehicles on the market only support slow charging and fast charging, and are equipped with slow charging and fast charging interfaces. Other charging methods have not yet been widely used.

1. Slow charging (conventional charging, on-board charging) is suitable for on-board chargers and home wall-mounted charging piles. Its current and power are relatively small, and the general charging time takes 6-8 hours.

2. Fast charging (ground charging, emergency charging) includes two forms of charging station and mobile supplementary electric car. It mainly charges the battery directly with a large current through an off-board charger, so that the battery can be charged to about 80% of the power in a short time. , generally can be fully charged in 1 hour.
3. For battery replacement , the car battery is charged by replacing the power battery . When the power battery is exhausted, the battery pack that is too low is replaced with a fully charged battery, and the replaced battery is sent to the replacement station for slow charging.

4. Wireless charging is to automatically connect to the power grid for charging and discharging through wireless charging source boards embedded in roads and parking spaces without using wires and cables. This charging method is convenient and safe to use, but it has not been used in mass production for the time being.

5. Mobile charging (MAC) is an extension of wireless charging. The owner does not need to find a charging station, spend time charging, and can charge when cruising on the road. The mobile charging system will be buried under a section of road, and the charging section will be demarcated, and no additional space is required.

Does using fast charge drain the battery?

It stands to reason that frequent fast charging will cause certain damage to the battery compared to slow charging. After all, fast charging uses a current that is several times or even 10 times higher than the standard charging current for charging. In the fast charging mode, when the power is charged to about 80%, the subsequent power will be fully charged in the form of slow charging.

If fast charging is used frequently, the polarization of the battery cells will be accelerated, resulting in lithium evolution in the battery cells. During the process of lithium evolution in the battery cells, the lithium ions will decrease, which will eventually lead to a decrease in the battery capacity and affect the battery life. However, except for lithium iron phosphate batteries, if the battery is given a short rest after fast charging, the lithium metal will change back to lithium ions, and the critical temperature will return to normal. However, frequent fast charging will still reduce the battery's ability to restore. Therefore, in order to ensure that electric vehicles can better solve the cruising range, car owners can choose the practice of "daily slow charging, emergency fast charging", or slow charging once a week to supplement.

New energy pure electric vehicles can not be charged?

The electric vehicle charging process is mainly divided into six steps: physical connection, low-voltage auxiliary power-on, charging handshake, charging parameter configuration, charging, and charging end.

When charging an electric vehicle with a charging pile, the first condition to be satisfied is the matching of the charging gun and the charging interface, that is, the physical connection. If the charging gun can be inserted into the car normally, the basis for charging is established. Low-voltage auxiliary power-on is the process of powering on the vehicle BMS. Only when the BMS is powered on can it further shake hands and communicate with the charging pile, that is, to confirm the version with each other. If the version is the same, the BMS will send detailed vehicle information and exchange information with the charging pile. During the charging process of the car, the two will generate a large number of packets. If there is a mismatch, the normal charging work cannot be completed.

Under normal circumstances, once the charging fails or the charging is interrupted, the charging pile will display the charging failure reason code. The meaning of these codes can be queried online, but it is a waste of time to query the codes. It is recommended to call the customer service of the charging pile or ask the staff of the charging station for the meaning of the fault code to determine whether the charging fault is caused by the car or the charging pile.