Vehicle charging piles are generally divided into AC charging piles and DC charging piles. The big difference between the two is that one belongs to slow charging and the other belongs to fast charging. It takes 7-10 hours for the AC charging pile to fully charge, and only 1-2 hours for the DC charging pile to fully charge.
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AC charging pile
AC charging pile: commonly known as "slow charging", it is a power supply device that is fixed outside the electric vehicle and connected to the AC power grid to provide AC power for the electric vehicle on-board charger (i.e. the charger fixed on the electric vehicle). The AC charging pile only provides power output and has no charging function. It needs to connect the on-board charger to charge the electric vehicle. It is equivalent to acting as a control power supply. The AC charging pile has no charging function, the input voltage is 220V, and the charging power is mostly 7kW. The charging is slow, the installation is simple, and the volume is small. It is generally installed in residential areas, shopping malls, office places and other places. The price is cheaper, generally less than 5000 yuan. Electric vehicle charging pile
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DC charging pile
DC charging pile: commonly known as "fast charging", it is a power supply device that is fixed outside the electric vehicle and connected to the AC power grid, and can provide DC power for the power battery of off board electric vehicles. The input voltage of the DC charging pile is three-phase four wire AC380V ± 15%, the frequency is 50Hz, and the output is adjustable DC, which can directly charge the power battery of the electric vehicle to meet the requirements of fast charging.
The input voltage of the DC charging pile is 380V, and the charging is fast. However, the installation is complex and large, and it is generally installed in public operation, public transportation, logistics and other places. The price is expensive, generally more than 10000 yuan.
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Full charging process
When the AC charging pile provides charging for the vehicle, it needs to go through two checkpoints: the on-board charger and the battery management system; The DC charging pile directly outputs DC power for the battery. New energy vehicle charging pile
The specific charging process of AC pile is as follows:
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Step 1
Inserting gun: the user pulls the gun from the charging pile and inserts it into the car charging port, and the physical connection between the gun and the car is completed.
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Step 2
Scan code to start: the user's mobile phone applet/APP scans the QR code on the pile to obtain the unique code of the charging pile and charging gun code, while ensuring that there is sufficient balance in the account, and then click [Start Charging] on the applet/APP.
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Step 3
Start charging: the charging pile sends "charging activation signal" and "AC charging connection signal" to VCU and BMS.
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The easiest pit for charging pile installation
1. Property filling/NEW
Before installing the charging pile, we need to apply to the property for a Parking Space and Construction Permit Certificate. This step seems simple, but it is easy to step on the pit. Many property management companies may refuse to provide this certificate in order to avoid liability. If it is rejected, we can call the property complaint hotline to explain your needs and problems in detail. If you still can't solve it, you can consider legal ways.
2. Select the appropriate charging pile model/NEW
It seems easy to choose the charging pile model, but if you choose the wrong one, your new energy vehicle may have problems charging. Different brands and models of new energy vehicles need to match different charging posts, so before installing charging posts, we need to determine the charging parameters of the vehicle, including voltage, current, etc. Some new energy vehicles need to use slow charging, while some need to use fast charging. People must choose correctly.
3. Electric power bureau survey site/NEW
After the online application, the staff of the power bureau will call to make an appointment for on-site survey, mainly to investigate the location of the wall meter and whether there is any electricity load. Then the pit will come. Due to the different installation positions of charging posts, the installation costs are also different. If you are in an old residential area and there is no load margin for the power box, you may be arranged to a power box location far away, and the cost will increase. Therefore, before the on-site investigation, people must consult in advance about the power load and routing direction of the property, so as not to waste money.
4. Reasonably plan the location of charging pile/NEW
When installing charging posts, we need to consider the layout of charging lines and power supply requirements. The distance between the charging post and the power entry point cannot be too long, otherwise the power loss will increase, and the too long charging line will also drop. The location of the charging pile should be fixed to facilitate the parking and connection of vehicles. At the same time, the installation height should also be considered, which should meet the convenience of plugging and unplugging as well as the safety of the charging line. Reasonable planning of the location of the charging pile can improve the charging efficiency and reduce unnecessary installation or relocation costs.
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Potential safety hazards and protective measures
Whether it is an AC charging pile or a DC charging pile, the following safety hazards and preventive measures should be paid attention to New energy vehicle maintenance
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Waterproof and moisture-proof
The charging pile equipment shall have a certain waterproof and moisture-proof capacity, but in extreme weather conditions, such as rainstorm, flood, etc., the use shall be suspended to ensure safety.
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Lightning protection
The charging pile shall be equipped with lightning protection facilities to prevent the lightning strike from damaging the equipment or causing safety accidents.
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Fire safety
Smoking, open fire and other behaviors shall be prohibited around the charging pile, and corresponding fire-fighting equipment shall be provided to deal with possible fire accidents.
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Q&A
Fast charging or slow charging?
It is generally recommended that AC slow charging should be preferred when the time allows, and DC fast charging should be used only when necessary or in an emergency.
Does frequent fast charging affect the battery?
Frequent fast charging will have a certain impact on the battery life, especially in the hot environment, the use of DC fast charging will accelerate the capacity loss of the battery.
How much charge is appropriate for electric vehicles?
If you choose slow charging, the charging is good. If fast charging is selected, it is an ideal state to charge to about 80% at one time, and some fast charging piles will automatically stop charging when charging to about 95% to avoid overcharging.
Which is better for the battery?
Compared with DC charging piles, AC charging piles (slow charging) are better for batteries. You should know that the current of the DC charging post is far greater than that of the AC charging post, which will lead to the high temperature generated when the DC charging post is used, which will accelerate the internal aging of the battery and eventually shorten the battery life.
DC charging pile and AC charging pile have their own advantages and disadvantages, and there is no absolute difference between good and bad. When selecting charging posts, we need to match them reasonably according to our actual needs and use scenarios.
If you often need long-distance driving or energy supplement, then DC charging pile is undoubtedly a better choice; However, if it is just a long daily commute or parking time,
