First of all, the electric vehicle fast charge and slow charge interfaces are corresponding to DC and AC interfaces, DC fast charge and AC slow charge. Under normal circumstances, the fast charge interface is 5, and the slow charge is 7. In addition, it can also be seen from the charging line that fast charging and slow charging, and the fast charging line is relatively stronger. Of course, some electric vehicles have only one charging mode for cost, battery capacity and other considerations, so there will be only one charging port.
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The principle of fast charge is to store direct current directly into the battery, and alternating current needs to be converted into direct current through the vehicle charger, which is stored in the battery, so the time will be much slower than the fast charge.
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At present, taking Beijing as an example, fast charge and slow charge are equally important, in some office buildings, fast charge can save everyone charging time, such as parking while charging shopping malls, eating lunch, 1-2 hours can be charged to 80% of the electricity, and slow charge although the time is slow, but basically are used in the parking space at home, charging at home at night. One night can also be full of batteries, so fast and slow are beneficial, but it is not thought that the speed is good, here is the problem.
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Because the fast charge is the direct current directly stored in the battery, so think about it can also understand that such a charge for the battery will be very high requirements, the power of direct current is very large, charging is to let the electrons accelerate from the positive to the negative flow, so a long time or frequent fast charge, will lead to the battery pack temperature rise, the battery decay will be faster.
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Alternating current has a relatively small impact on the battery because of the on-board charger conversion, but it is relatively time-consuming. And at present, the family slow charging pile is basically 220V, most household circuits can be used, so the parking space in the community, the underground garage can be installed at any time, convenient for users to use.
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Of course, just said fast charge for the battery impact is not a blanket, because it also depends on the density of the battery, the material and charging temperature, battery pack management system, etc., when the battery production can not be unified specifications and standards, fast charge and slow charge coexist is the best way.
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Although you are now using fast charge, but feel that the speed of charge is not fast, the charging speed is actually determined by many factors, such as the capacity of the battery, the charging time of the large battery is long, the charging time of the small battery is short, and the charging time is also related to the battery material.
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At present, domestic electric vehicles are using lithium iron phosphate batteries, and the charging time of this battery is not the same as that of ternary lithium batteries under different conditions.
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But we do not have to be too tangled fast charge, slow charge which is good
The differences between fast charging and slow charging of electric vehicles are mainly as follows:
1. Charging speed: fast charging is faster than slow charging;
2. Charging efficiency: fast charging is higher than slow charging;
3. Charging safety: fast charging is safer than slow charging. The impact of fast charging and slow charging on the car is mainly the service life of the battery, and fast charging will shorten the service life of the battery, while slow charging will not.
Fast charge and slow charge are relative concepts, generally fast charge for high-power DC charging, half an hour can be filled with 80% of the battery capacity, slow charge refers to AC charging, the charging process takes 6-8 hours.
The charging speed of electric vehicle is closely related to the power of charger, battery charging characteristics and temperature. At the current level of battery technology, even fast charging takes 30 minutes to charge to 80% of the battery capacity, after more than 80%, in order to protect the safety of the battery, the charging current must be smaller, and the time to charge to 100% will be longer. In addition, when the temperature is lower in winter, the battery requires a smaller charging current, and the charging time will become longer.
Question: Does it hurt the car quickly?
A: Fast charge battery life cost
Fast charging will use a large current and power, will have a big impact on the battery pack, and will also have an impact on life. Fast charging also requires supporting equipment, such as converting AC direct current, so the cost will rise.
There are two ways to charge electric vehicles: slow charge and fast charge, the difference is that slow charge is the charging pile output AC, do not directly charge the battery, to be converted into direct current through the car charger; The fast charge is that the charging pile outputs direct current and directly charges the battery. It can be seen that fast charging technology is more complicated than slow charging. The specific use of slow charge or fast charge depends on the characteristics of the battery used by the manufacturer, if with a fast charge port is safe and fast charge, will not have a significant impact, you can rest assured to use.