New energy vehicles have fast battery charging, what is the principle of fast battery charging?

Electric vehicle then its energy comes from the battery, the speed of vehicle charging, related to the vehicle experience and battery life, for new energy vehicles electric vehicle charging efficiency, charger power, battery charging characteristics and temperature are closely related, for the current electric vehicle, careful observation in the electric vehicle will have two charging ports, has been DC charging port and AC charging port, for electric vehicles, fast charging is how to work?

Generally speaking, fast charging is DC charging, fast charging as the name suggests, fast charging is the process of fast charging of the battery, which can be simplified to understand that the fast charging mode is to use a large current, in less than 1 small hint of Fa Fa SF An Shi An An Shi An Shi An Fu released a high score of fast charging to the battery, and secondly, for the inside of the battery, when fast charging, lithium ions need to be accelerated instantaneously embedded in the negative electrode. First of all, the charging is carried out with a wide charging pulse, the terminal voltage of the battery rises, when the time set by the charging time is reached, the charger pauses charging, and the charger continues to charge when the charging interval reaches another point.

So repeatedly, the fast charger implements intelligent real-time adjustment of the charging pulse of the pulse charger according to the actual charging state (current, voltage, temperature, dynamic internal resistance, etc.) of the rechargeable battery, and raises the charger and the rechargeable battery into a system problem, so the core of the lithium battery fast charging technology is to accelerate the speed of lithium ions moving at the positive and negative electrodes through chemical system and design optimization without affecting the life and reliability of the battery. Fast charging has higher requirements for the battery system and charging system, and the charging speed (power) has higher requirements for batteries and other related components.

To put it simply, the DC fast charging system has electrical and safety requirements for the external distribution box of the system, and the higher DC fast charging system also has new requirements for the thermal management capability of the battery system.

The principle of fast battery charging is that the battery is quickly charged by high voltage, which can improve the power in a short time, but it is easier to damage the battery.

In the fast charging state of lithium battery, the lithium ions in it move at high speed and instantly reach the two poles of the battery for fast charging.

What is the principle of fast charging and slow charging of electric vehicles, and will regular use of fast charging hurt the car battery?

1. Rectifier circuit.

The rectifier circuit is composed of AC rectifier filter, direct current (DC) continuous flow (DC) converter (high-frequency converter) and other components, which are used to obtain alternating current from the single-phase or three-phase AC power grid and convert it into DC that meets the requirements.

2. Adjust the control and protection circuit.

The adjustment control circuit adopts PWM pulse width modulation circuit, including output sampling, signal amplification, control adjustment, reference comparison and other units, and its function is to detect and sample the output voltage, and compare it with the reference fixed value, so as to control the switching time ratio of the high-frequency switching power tube and achieve the purpose of adjusting the output voltage.

3. Power factor correction network.

The power factor correction network is an important component of the charger, and its function is to make the input current waveform track the sinusoidal fundamental current through the control process, and the phase is in phase with the input voltage, so as to keep the output voltage stable and the power factor close to it.

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Charging system principle: when VTOG charging, it automatically identifies the single-phase and three-phase phase sequences and controls the charging mode according to the charging current, and identifies the charging power according to the charging equipment and controls the charging mode;

The charging system of new energy vehicles is clear at a glance.

Principle of charging and discharging.

1. Charging system: There are two charging methods, DC charging (commonly known as fast charging) and AC charging (commonly known as slow charging);

2. AC charging is mainly connected to the AC charging port through AC charging piles, wall-mounted charging boxes and household power supply cradles, and the AC power is converted to DC high-voltage power above 500V to charge the power battery through the high-voltage electronic control assembly;

3. DC charging is mainly to charge the power battery directly through the DC charging port through the charging station and charging cabinet.

4. The main components of the charging system:

DC charging port.

AC charging port.

When new energy vehicles use fast charging, it generally only takes half an hour to an hour to charge more than 80 batteries.

New energy vehicle charging 90. It doesn't need to be fully charged at one time, it can be stopped as long as it reaches more than 80%, and it can also meet the mileage you need for your next trip.

The battery of a new energy vehicle does not have to be fully charged. Overcharging and over-discharging the battery should be avoided. Overcharging or completely draining the battery can cause some damage to the battery.

In addition, when the battery is more than 90% charged, the charging speed will be reduced. There is no need to fully charge the battery unless you are not at home.

Battery charging is divided into two stages, from 0%-90% (this will become according to the battery) is constant current charging, that is, the voltage increases with the increase of battery voltage. Then it enters the constant voltage charging mode, the voltage is slightly higher than the final voltage of the battery, and the current will gradually decrease. Finally, it enters trickle charging mode, and the charging state is maintained with a small current.

Of course, the new energy vehicle can be fully charged with fast charging, and now it is getting faster and faster with that fast charging and 80% of the power can be fully charged, like the battery charging of new energy vehicles is equivalent to the time of refueling.

By setting the car machine, it can be charged to 100%. Q5-etron DC fast charging more than 80% of the way to charge is as follows: Car Home Page Flip left to show "Vehicle" and click Select "Charging" to adjust the charging amount to "Long Distance".

Long-term use of "overcharge" will accelerate the decay of lithium battery electric reserves. It is only suitable for long-distance running.

This can be charged, but it will affect the life of the battery.

For electric vehicles to be charged quickly, they must be charged at public charging piles and turn on the car's fast charging mode. The charging power of the high-speed charging mode generally reaches more than 40kw. Use the DC charging file charging interface (5 holes) to convert the AC of the power grid into DC, and transmit it to the fast charging port of the electric vehicle, and the power will directly enter the battery for charging, charging 50% in 30 minutes, and charging in 80 minutes.

How to charge electric vehicles quickly, fast charging can save a lot of time compared to slow charging, but fast charging can have a certain impact on battery life, unless it is particularly needed, it is best to use it as little as possible. Even if you need to charge it quickly, it is not recommended to use it frequently. There are generally one way to charge electric vehicles:

Portable chargers. As long as it is connected to a household 220v 16a 3 amp socket, you can charge the electric car, but the charging speed is slower. Portable chargers can be purchased in online shopping malls, but it is necessary to choose a well-known brand with good quality.

Home Charging Files. If there is a personal fixed parking area, you can choose to set up a home charging pile, but it is enough to have a charging pile. It must be approved by the real estate company, and the installation can only be carried out after the review of the electric dry staring company.

It's also troublesome. Public top-up file. If the first two methods are not available, public charging stations will be the only option.

Public charging piles are generally operated by power companies such as the State Grid and China Southern Power Grid Construction and Maintenance, but some private enterprises have entered this field. At present, the endurance performance of pure electric vehicles is getting stronger and stronger, and the endurance of many pure electric vehicles has reached 600 kilometers or even more than 700 kilometers. But the charging speed of BEVs is still sick, and even with high-speed chargers, it takes at least 40 minutes to charge BEVs.

So, how can you speed up the charging of pure electric vehicles? How can electric vehicles be charged faster? What needs to be overcome is that we need to understand why BEVs are not charging so fast.

The inability of BEVs to get fast charging speeds is not due to the surrounding charging equipment, but to the battery pack itself. The traditional ternary lithium battery pack has the disadvantage of acceptable charging capacity, so charging too fast will have a bad impact on the battery pack, or seriously affect the life of the battery pack, so the charging speed of the battery pack cannot be too fast. The existing direction is solid-state battery packs.

Solid-state battery packs charge much faster than electrolyte battery packs. That is, the charging speed of the solid-state battery pack is better in terms of acceptable charging capacity, and even if the current and voltage are larger, the solid-state battery pack will not be damaged.

You should change to a charger with a relatively fast charging speed, and this can also ensure that there will be no other problems when charging, and there are also some fast charging technologies.

Now it is still necessary to improve the battery and charger, and there is still no fast charging technology, which does not mean that there will be no in the future.

At this time, you can use some high-power chargers, and you can also extend the battery life appropriately, yes.

At present, although the charging speed of new energy vehicles is not as fast as that of mobile phones, the speed is quite fast. According to the introduction of the merchant, fast charging refers to the charging of electric vehicles for 30 minutes, the power can be charged to 80%, and the range can reach 200 kilometersThe premise is that the battery level must not be less than 20% when charging, starting from 20% to 80%. The current situation is determined by the charging technology, the performance of the battery, the charging pile, etc.

Electric vehicles use lithium batteries, which can be charged quickly or slowly, but they cannot be charged frequently, which will shorten the life of the battery. The benefit of fast charging is that it can increase the speed of charging and shorten the waiting time for people. ButFast charging belongs to the charging of large current, a short time through a large current, accumulating a large amount of heat, will make the battery temperature rise, affect the life of the battery, lithium battery will also produce air accumulation, there will be potential accidents.

The benefits of slow charging are more than fast charging The disadvantage is that the waiting time is long, and if you are not in a hurry, you can choose slow charging. Slow charging can be selected at night, and charging in sections at night troughs. At this time, the electricity bill is relatively low, and you can save a lot of money for a long time.

And it can effectively protect the battery and prolong the service life. Electric vehicles are equipped with a battery management system, which can control the charging interface and control the current intake according to the amount of power.

At last year's car show, two charging solutions for electric vehicles were presented, getting rid of the previous charging piles. Charging is done wirelessly with automation. The principle of charging is to configure the charging pad at the charging location, and at the same time configure the charging pad at the bottom of the car, and the micro-navigation system is installed on the car to ensure the accurate docking of the two pads, so as to start charging.

It's a bit similar to the current phone charging, just put the phone on the charging pad. This is a new type of charging, and there are still many areas that need to be perfected.

New energy vehicles are the future development direction. It has not started for a few years, with the continuous development and improvement of technology, many of its problems will be solved, and people will become more and more accepting of new energy vehicles.

The charging of new energy vehicles will not be as fast as charging mobile phones, because the power used by new energy vehicles is relatively large.

Yes, the related technology is very mature, the battery device is also very long, and the charging efficiency is very high.

It will be realized, with the development of science and technology, this will definitely be possible, compared to the beginning of the current charging speed has been improved a lot, researchers are also developing this project.

If the charge is fast, it will be troublesome.

Because direct current is not very easy to damage, the battery of the electric car is already fragile, so it needs a relatively slow current.

Because the voltage of DC is very high, it can speed up the charging speed, which also improves safety and avoids fire.

Because this charging method is faster and bears more voltage, it will not cause the battery to overheat,**, and it is safer.

The fast charging of new energy vehicles has certain damage to the battery.

Theoretically, fast charging of new energy vehicles has certain damage to the life of the battery, but this damage is relative to slow charging. If there are more fast charging times, the user can clearly feel that the battery is not working, which means that the fast charging settings of this car are problematic. In order to achieve fast charging capabilities, car companies carry out fast charging in a state that the battery cells cannot bear, which will also affect the battery life.

When to charge

In the case of daily driving, if the current remaining power cannot meet the mileage of the subsequent destination, you should find the nearest charging pile for charging. If you have enough time, you should try to choose the slow charging mode, and if the time is urgent, you can also choose the fast charging mode.

Advantages of new energy vehicles

1. Reduce air pollution

As we all know, general fuel vehicles will emit a large amount of exhaust gas when they are running, and the exhaust gas emitted into the air will produce material changes and cause pollution to the air. The smog problem in recent years is also caused by excessive vehicle emissions. Because new energy vehicles generally use charging, fuel hybrids, or direct pure electric energy, the use of new energy vehicles can reduce air pollution, which is also one of the reasons why the state has been vigorously supporting the new energy industry.

2. There is no tail number restriction and national policy support

Now more and more big cities travel to limit the number of lines, in addition to the cost of buying a license plate, many families to buy two cars may not be enough, but under this premise, the state has introduced policies to vigorously support new energy vehicles, many cities no longer limit the tail number of new energy vehicles, to solve the problem of many people driving troubles.