What are the key technologies for the maintenance of new energy vehicle charging systems in 2021?

The common key technologies of new energy vehicles mainly include vehicle integration technology, electric drive technology, energy storage technology, fuel cell technology, high-voltage electrical technology, etc.

In the maintenance process, the first thing is to use the display screen of the vehicle combination instrument, or to use the diagnostic instrument to check the single voltage of the power battery pack, and then use the diagnostic instrument to read the vehicle fault, so as to determine the cause of the fault. However, if the cell voltage of all power batteries is relatively close and low, it is mainly due to the low power of the battery pack, which can be recovered by charging.

If the voltage of the battery is close to that of most cells, but the voltage of one or more of them is low, then it may be caused by the low voltage of the battery. There are two main reasons why the cell voltage of the power battery is low: first, the battery performance is attenuated; The second is that there is an error in the battery voltage acquisition.

Hello, there are three charging methods for new energy vehicles, the first is rechargeable, the second is the way to change the battery, and the third is hydrogen.

To understand the basic structure of the car, we must have a particularly strong judgment ability, choose different maintenance methods according to different situations, pay attention to the frequency of charging, the number of charges, and ensure the capacity of the battery.

In 2021, the key technologies for the maintenance of the power battery system of new energy vehicles are: power battery, drive motor, vehicle operating system and other key technologies.

In 2021, the key technology for the maintenance of the power battery system of new energy vehicles is to ensure the original endurance time, while also taking into account safety.

Power battery module.

Battery cell: The smallest unit that constitutes a power battery module. It is generally composed of a positive electrode, a negative electrode, an electrolyte and an outer shell. It can realize the direct conversion between electrical energy and chemical energy;

Battery module: the combination of a group of battery cells connected in parallel, and the rated voltage of this combination is equal to the rated voltage of the battery cell, and is the smallest grouping of battery cells connected in the physical structure and circuit, and can be replaced as a unit;

Module: A combination composed of multiple battery modules or single cells connected in series.

The C30DB project uses a lithium-ion power battery system, which is a rechargeable battery, which mainly relies on lithium ions to move between the positive and negative electrodes to work. When charging, lithium ions are de-intercalated from the positive electrode and embedded into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; The opposite is true when discharging. Lithium-ion batteries can be divided into lithium cobalt oxide batteries, lithium manganese oxide batteries, lithium iron phosphate batteries and three-element batteries according to the different cathode materials.

With the development and progress of the times, the development of new energy vehicles will become a rookie in the future automotive industry, and the continuous development of science and technology is bound to promote the innovation and reform of automobile manufacturing process, so the maintenance technology of new energy vehicles also needs to be continuously improved and developed in order to meet the maintenance needs of new energy vehicles.

Although at this stage, the development of new energy vehicles in China is still in the initial stage, but the upgrading of science and technology, is bound to promote the reform and innovation of new energy vehicle manufacturing process, the traditional maintenance concept and maintenance technology has been unable to meet the maintenance needs of new energy vehicles, in order to promote the sustainable development of new energy vehicles, it is necessary to continuously improve the professional skills and technical level of maintenance personnel, after all, it is the maintenance personnel who play an important role in the process of new energy vehicle failure maintenance, In order to effectively improve the level of maintenance technology development, it is necessary to pay attention to the training of professional maintenance personnel.

Regularly organize maintenance personnel to participate in education and training. Continuously improve the "safety first" of maintenance personnel.

First, quality first" maintenance awareness, maintenance personnel need to learn more advanced maintenance knowledge, and constantly improve and enrich their own knowledge reserves, master more advanced and scientific maintenance technology, in the case of conditions can organize maintenance personnel to go out to study, fully grasp the knowledge of new energy vehicle structure and technology, learn to identify different types of fault problems, in-depth understanding and research of the causes of failure problems, and flexible use of modern maintenance methods to deal with various fault problems.

Preparations should be made before carrying out the maintenance work of new energy vehicles: first, it is necessary to check the operation status of the vacuum pump and controller, and conduct a detailed inspection of the vacuum pipeline to ensure that the vacuum pipeline is sealed. Secondly, it is necessary to pay attention to the circuit inspection and braking system inspection of new energy vehicles, when these inspections do not find any fault problems, in order to effectively ensure the safety and stability of new energy vehicles, and new energy vehicles that pass the inspection can be put into the market.

Finally, the traditional maintenance technology and equipment has been unable to meet the maintenance needs of modern new energy vehicles, increase investment, the introduction of advanced maintenance technology and maintenance equipment, the use of modern maintenance equipment to check and judge the fault problems of new energy vehicles, combined with the rich experience of maintenance personnel and electronic equipment, diagnosis and analysis of the causes of different fault problems, according to the diagnosis results to take corresponding maintenance measures for troubleshooting.

The maintenance of new energy vehicles is very important, and if you want to improve the maintenance technology, it should be better combined with science and technology to enhance the professional and cultural literacy of maintenance workers.

It is necessary to understand the problems that new energy vehicles are prone to, and then find the problems and adopt appropriate maintenance technology, cultivate special talents, and increase training efforts. It is also necessary to intensify publicity, increase investment funds, and increase equipment maintenance.

<> "New Energy Vehicle Charging Technology ** Point".

Direct current: the first choice for fast charging of vehicles.

Charging principle: DC charging refers to the way to convert AC current into DC power supply through the charging pile and charge the power battery.

Advantages: DC charging efficiency is high, the power of DC charging piles on the market ranges from tens to hundreds of kilowatts, it only takes 10-15 minutes to charge to 80%, and it can be fully charged in as little as an hour. Therefore, for many new energy vehicles used for platform operation and long-distance travel, DC charging is the first choice.

Disadvantages: This charging method also has restrictions on vehicle models, and is only suitable for vehicles with fast charging functions.

Applicable models: Nearly 80% of the models can be charged with direct current, but some of the miniature new energy vehicles on the market, such as Hongguang MINIEV, Changan LUMIN, QQ ice cream, etc., cannot be charged by DC.

Market Penetration:

Affected by the household electricity voltage, DC charging is mostly used in urban public charging facilities and charging stations in intercity high-speed service areas.

Alternating current: Household equipment is the main nuclear answer.

Charging principle: AC charging uses a standard charging interface to charge the battery using a conduction method.

Advantages: Because it adopts a small constant voltage or constant current current, the power of the common model is only 7 kilowatts, so the power consumption limit is small, and the use of the scene is very wide. And the charging method equipment cost is low, so it is very suitable for charging your car as a private charging pile in the family scene.

Disadvantages: Due to the small charging power of the AC charging pile, the efficiency is low, and the charging time is about 5-8 hours, and the longest even more than 30 hours.

Applicable models: Almost 100% of new energy vehicles can be charged in this way, but due to the slower charging speed, it is more suitable for vehicles with long shutdown time or plug-in hybrid models with small battery capacity, such as Trumpchi GS4 PHEV, BYD Song DM, BMW X1 PHEV, etc.

Battery swapping technology: not yet popular.

Charging principle: The battery replacement technology is to replace the battery of the new energy vehicle through fully automatic or semi-automatic mechanical equipment, so as to realize the supply of electric energy.

Advantages: Similar to replacing the battery of a toy car, it generally only takes 2-10 minutes to complete a replenishment.

Disadvantages: In the field of private cars, only a few brands can provide battery swap services for car owners, and in the case of NIO, which everyone is more familiar with, the brand expects to build more than 2,300 battery swap stations by the end of 2023.

Market Penetration:

Battery swapping technology enables new energy vehicles to achieve a similar refueling speed as traditional fuel vehicles, but it is currently only popularized in the field of public transportation and logistics. Compared with the number of public charging piles in Huitai before the reform of more than one million, there is still a long way to go.

Wireless charging: The technology is not yet mature.

Charging principle: within a certain space range, charging is realized through electromagnetic induction.

Advantages: Automatically charge the vehicle by parking it at a designated location, or integrate wireless charging into urban roads to charge while running.

Market Penetration:

At present, this technology is still in the research and development and exploration stage, and we can only wait patiently with anticipation before it is put into practical use.

There are two charging methods for new energy vehicles, one is to charge with the help of public charging piles, and the other is to use their own charging devices for charging, which is specified below.

1. Use public charging piles for charging

As of August 2019, with the increasing number of brands and numbers of new energy vehicles in the society, a large number of public charging piles for new energy vehicles have also been set up. When charging with a public charging pile, pay attention to distinguishing between fast charging and slow charging. Generally speaking, fast charging can be used when charging with public charging piles, and the vehicle can be fully charged in 1-2 hours without delaying the normal driving of the car.

It is relatively fast to charge when using the public charging pile, but it needs to go to a special charging area for charging, which is not very convenient in places where there are no public charging piles.

2. Use a home charging device for charging

Charging with a home charger is safer and less expensive. However, the charging speed is relatively slow, and it generally takes 8-10 hours to charge a single charge.

Matters needing attention when charging new energy vehicles:

1. When charging new energy vehicles, the charger and socket must be plugged in tightly to ensure the safety of electricity.

2. Don't charge it when the battery of the new energy vehicle is completely empty, which will not only damage the battery but also cause unnecessary trouble.

<> "The basic structure of the new energy vehicle charging system: the automobile charging system circuit is composed of power supply circuit, starting circuit, ignition circuit, lighting and light signal device circuit, instrument information system circuit, auxiliary device circuit and electronic control system circuit.

1. The power supply circuit, also known as the charging circuit, is a circuit composed of a battery, a generator, a regulator and a charging bucket indication device, and the electric energy distribution (distribution) and circuit protection devices can also be classified into this circuit.

2. The starting circuit is a circuit composed of a starter, a starting relay, a starting switch and a starting protection circuit. The device of starting preheating under low temperature condition and its control circuit can also be included in this circuit.

3. The ignition circuit is a unique circuit of gasoline engine cars. It consists of an ignition coil, a distributor, an electronic ignition controller, a spark plug and an ignition switch. The electronic ignition control system controlled by the microcomputer is generally included in the engine electronic control system.

4. The circuit of lighting and light signal device is composed of headlights, fog lights, marker lights, turn signals, brake lights, reversing lights, interior lights and related travel control relays and switches.

5. The instrument information system circuit is a circuit composed of the instrument and its sensors, various alarm indicators and controllers.

6. Auxiliary device circuit is a circuit composed of various electrical devices set up to improve the safety and comfort of the vehicle. The type of auxiliary electrical equipment varies with different models, and the higher the grade of the car, the more complete the auxiliary electrical device. Generally, it includes windshield wiping and cleaning device, windscreen defrosting (anti-fogging) device, air conditioning device, audio device, etc.

The higher-end models are also equipped with electric window lifts, electronically controlled door locks, electric seat adjustments, and electric remote mirrors. Electronically controlled airbags are subsumed into the electronic control system.

7. It is mainly composed of engine control system (including fuel injection, ignition, emission and other controls), automatic transmission and constant speed driving control system, brake anti-lock braking system, airbag control system and other circuits.

<> "Some questions about the charging of Xinnengxin Li Yuan's cars.

The biggest problem of electric vehicles is the problem of charging, there should be many people who have a lot of questions about electric vehicle charging, so let's take a look at whether these problems are what you care about.

1. What are the charging methods for new energy vehicles?

Fast charging and slow charging, pure electric vehicles can be charged by fast charging, slow charging and other methods. Hybrid vehicles can only be charged slowly. The slow charging power is low, the charging time is long, and it is suitable for charging when the driving is stopped for a long time; The fast charging power is high, the charging time is short, and it is suitable for temporary emergency charging.

2. Must the charger be grounded?

For the sake of safety, most of the new energy vehicle slow charging gun will detect the grounding state when the power is on, if it is not properly grounded, it can not be charged, otherwise once the power leaks, there will be 220V alternating current between the body and the earth, and people are easy to be electrocuted when they go to open the door, so there is a saying that charging must be grounded.

3. Can it be charged on rainy days?

Ordinary rainy days are OK. The charging port of the new energy vehicle has a certain waterproof ability of slipping and falling, and is well sealed, so it can be charged on ordinary rainy days. However, when plugging and unplugging the charging rush, pay attention to the shielding to prevent the rain from directly entering the charging port and causing a short circuit and affecting the next charging.

In addition, in case of heavy rainstorm, it is recommended to suspend charging first. Because many charging cables are relatively long, if they are damaged and soaked in water, they may cause short circuits or fires, which is a potential safety hazard.

Can A turn 16A plug work?

Most new energy vehicle chargers are 16A plugs, which need to be connected to a 16A socket before they can be used. However, there are no 16A sockets in some places, so many people use 10A to 16A sockets to charge new energy vehicles. Again, this is risky.