Principle of fast and slow charging for 2/3 wheel electric vehicles.

Principle of fast and slow charging for 2/3 wheel electric vehicles.

The vast majority of electric vehicles on the market now generally support fast charging and slow charging. The following is a schematic diagram of the fast charging interface and slow charging interface. In the picture, the left side is the fast charging interface, and the right side is the slow charging interface. The charging current of fast charging interfaces will be very large, so the battery cells will be much thicker compared to slow charging. At the same time, the number of holes in the battery cell should also be much more. Many people may not be familiar with the principles of fast and slow charging stations. Below is a brief analysis for everyone.

Slow charging

For slow charging, when the charging station comes in, the first one connected is the OBC, which is the on-board charger. The function of this device is to convert the AC power coming in from the charging station into DC power, which is called AC-DC conversion. The reason for the need for this AC-DC conversion is that the power battery only supports DC charging. That is to say, the charging power is directly determined by the power of the OBC. At present, the mainstream OBC power on the market is 7kW, and there are also 11kW and 22kW.

Fast charging

The so-called fast charging is to connect the AC-DC converter externally to the charging station, so that the output current of the charging gun is directly DC. As it is external, the charging power can be increased significantly, as there is no need to consider quality, space, and cost issues too much. So, generally speaking, fast charging power can range from 30kW to several hundred k'W.

brief summary
Both fast and slow charging stations can meet the charging needs of different driving scenarios. Pure electric vehicles also have the function of fast and slow charging, which is actually to increase the convenience of charging. Of course, in order to consider the service life of the power battery, we suggest that the charging strategy should still focus on slow charging, supplemented by fast charging, and try to achieve on-demand charging as much as possible.
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