Does electric car fast charge damage battery? Are there charging pile on highway?

Does electric car fast charge damage battery? Are there charging pile on highway?

As a new generation of products, new energy vehicles are unfamiliar consumers. Even as more and more people buy new energy vehicles, they may know few about this. For example, does fast charging damage battery? Are there charging piles on the highway? Can new energy car batteries be recycled?

What damage does the fast charge have on the battery?

Everyone has heard that electric cars have two kinds of difference between fast charge and slow charge. They also know that fast charge is much faster than slow charge, but what is the difference between them?

Fast charging and slow charging concept: fast charging and slow charging are relative concepts. Generally, fast charging is for high-power DC charging. It can fill 80% of battery capacity in half an hour. Slow charging refers to AC charging. The charging process takes 6-8 hours.

The voltage of the fast charge DC charging is generally greater than the battery voltage. For example, BYD Qin's battery voltage is 400V DC, then the DC charging voltage should be above 500V, Qin's power is 13KWH, then its charging current should be 32.5A, that is, the fast charging power is P =UI=500V*32.5A=16.25KW.

Slow charging is inserted in the family's 220V AC outlet, because the battery cannot accept AC charging, so slow charging is to convert 220V AC to DC and then boost to the battery charging voltage such as 500V DC, and then use this 500V DC power is charged to the battery.

From this, it can be concluded that the maximum charging power of slow charging is about P=UI=220V*10A=2.2KW. It can see that the fast charge power of 16.25KW is much larger than the slow charge of 2.2KW, so we can find that fast charge is much faster than slow charge.

Slow charging advantages and disadvantages: low current, long charging time, low charger and installation cost; can fully utilize the power low valley period to charge, reduce charging cost; can deep charge the battery, improve battery charging and discharging efficiency, and extend battery life.

Household slow-charge AC: Since the general household 220V, AC outlet is 10A and 16A, for the sake of safety, the charging current of slow charging is generally less than 10A, calculated according to the standard of 10A.

Fast charging and shortcomings: Quickly replenish the battery pack in a short time, the charging speed is fast; the charging equipment installation requirements and cost are high, the current voltage is high, the battery impact is large in a short time, and the long-term fast charging affects the battery life.

The danger of fast charging: The rapid charging of lithium batteries is at the expense of the cycle life of the battery, because the battery is a device that generates electrical energy through electrochemical reaction, charging is a reverse chemical reaction, and fast charging will input into the battery at an instant. High current, often using the fast charging mode will reduce the battery's reducing power and reduce the number of cycles of battery charging and discharging.

Simply put, fast charge has high requirements on the quality of the battery, the reaction conditions of the battery under high current are too harsh and severe, far from the equilibrium state, the battery life is greatly lost, and the safety factor will significantly reduced. Try to do as little as possible when not necessary. Slow charging can be a good way to avoid these problems.

How to recharge properly and slowly?

During normal driving, if the red and yellow lights indicate that the red and yellow lights are on, they should charged; if only the red light is on, stop running and charge as soon as possible, otherwise, the battery will be seriously discharged and the life will be seriously shortened. When the battery is fully charged, the charging time is short, and the charging time should not be too long. Otherwise, overcharging will occur and the battery will heated. Overcharging, over-discharging, and under-charging can shorten battery life.

There are also charging piles on the highway.

According to the plan, by 2020, the State Grid Corporation will build a total of 10,000 public fast-charging stations and 120,000 charging piles across the country, covering Beijing-Tianjin-Hebei, and all the cities in the Yangtze River Delta and other major cities. The network covers 202 cities and 36,000 kilometers of expressways. By 2017, the Beijing area will built with a five-kilometer radius public city-charging network.

Expressway Special Card: The charging pile of the State Grid on the expressway needs to use the "High Speed Road Dedicated Charging Card", and the charging card in the ordinary city cannot be used. Holding a dedicated charging card for the expressway, you can do it with you. Handling method: The owner can go to the designated business hall to handle the "high-speed special charging card".

If you do not have time to go to the outlet business office, you can also call 95598-customer service at least 45 days in advance, and make an appointment to charge the designated charging service area. The staff of the high-speed road charging pile will arrive within 45 minutes. Charging.

Can new energy vehicles, be converted?

At present, electric vehicle, replacement has not yet reached a unified standard in the industry, and the industry generally has some differences in position on the electric vehicle replacement. Details as follows:

1. Battery model problem: There are many electric vehicle brands on the market. The battery models of each model are different from those of the manufacturers. The electric vehicles of each brand cannot used universally.

From the perspective of development needs, the future is not just taxis; private electric vehicles also have the need to change electricity. If you want private cars to enjoy the service of changing electricity, you must solve the problems of battery specifications and charging standards. It is necessary to speed up the unified battery specifications and charging standards, and lay the foundation for the future replacement of batteries for private cars.

2. Battery reserve problem: Each gas station in the Third Ring Road of Beijing Municipality serves an average of 300 vehicles per day. If the power station is to serve 200 electric vehicles per day, a charging and replacing, station needs at least 100-150 battery reserves.

The battery materials of different brands are different. Take EV200 and BYD E6 as examples. The EV200 uses the ternary lithium battery of SK Company of South Korea, while the BYD E6 adopts the ET-POWER iron battery independently developed and produced. The batteries need to stock.

3. Popularization of standards: The construction of power stations has accelerated the popularization of electric vehicles in the country. It is not surprising that electric vehicles used across cities. However, the replacement of batteries by different brands is not exactly the same. Automatic power exchange systems may not be universal.

At the same time as the construction of the power station, a unified power exchange method and standards should formulated to make cross-regional power exchange possible. Electric vehicles are rapidly gaining popularity in cities. With the construction of power stations, electric taxis will replace fuel taxis. However, in order to realize the universal popularity of electric vehicles, the government should speed up the standardization of electric vehicle battery specifications, charging standards and power exchange standards, laying the foundation for the popularization and cross-regional use of private electric vehicles in the future.

Can new energy car batteries be recycled?

China's power battery research mainly focused on improving its safety performance and service life, while the recycling process is quite small. On the development of new energy vehicle blowouts, it is very necessary to build a complete power battery recycling system based on relevant foreign experience.

The United States has a comprehensive study of power batteries and has now developed a sound business model. GM's experiment with ABB has achieved some success, feeding back the power collected by the Chevrolet Volanda battery pack to the grid, ultimately enabling home and commercial power. After trying, the re-integrated modular unit can support two to five hours of electricity supply in 3-5 US homes. In the near future, similar applications will provide backup power for some homes and small commercial buildings in the event of a power outage. At the same time, the storage of electricity during peak hours during the electricity price period can also use to make up for the shortfall in wind power, photovoltaic or other renewable energy generation.

In Germany, battery production and importers must registered with the government, dealers must organize the recovery mechanism, and users are obliged to hand over the used batteries to the designated recycling agency.

This implementation of the producer responsibility, extension system and the establishment of a perfect battery recycling system. At the same time, the German Ministry of the Environment funded two demonstration projects for the recycling of power batteries to conduct research on the utilization of waste power batteries.

The more popular methods in Japan are to use the scrapped lithium battery to build a solar power system. When the sun is sufficient, the solar panel generates electricity to the storage system, and the storage system supplies power to the household appliances. in case of cloudy or nighttime It is optional to purchase the electricity of the power company to charge the power storage system during the period when the electricity price is low, and only take power from the power storage system during the period when the electricity price is high.

Buying a second-hand electric car is reliable.

At this stage, the second-hand new energy vehicle market in major first-tier cities is almost a "blank", both "no price" and "no market". However, with the increasing number of electric vehicles, the problem of preserving the value of used vehicles, and the problem of recycling used vehicles, relevant government departments and manufacturers will think ahead of time. However, I have to admit that new energy vehicles have increasingly involved in our lives, whether it time-shared or privately purchased. The practitioners of the used car trading market pointed out that they would not be willing to buy second-hand new energy vehicles because the market is still not recognized, and the demand for buyers is too low to shot.

Current electric vehicle secondary market situation

The situation of second-hand new energy vehicles: First, car dealers are not willing to purchase, price is unstable, the reduction from tens of thousands to hundreds of thousands. There are no strictly measure for purchase price. Second, complicated subsequent and limited maintains. It can only booked in advance in the 4S store, which is difficult for consumers not in the around. Third, endurance ability is worth considering. After all, new energy vehicle is not an engine drive but an electric motor. The service life and endurance of battery are a key point. The performance of second-hand car is also difficult to guarantee.

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