On June 30, the CRRC localization off-line ceremony was held at the circular test base of the East Branch of Beijing Railway Science and Technology Institute. High-speed rail is synonymous with tall, where is the significance of high-speed rail lithium battery? What is the role of lithium batteries in high-speed rail?
The project started research and development from the beginning of 2012. Up to now, more than two years have passed, and various types of tests have been conducted on the ground. At the same time, lithium batteries have also been used first for feasibility verification on other rail transit scientific research projects.
The project represents the highest level of high-speed rail in China. It is led by General Iron. Changchun Railway Passenger Car and Qingdao Sifang Plant each represent a high standard of North-South vehicles and a unified standard. The CNR battery box can be quickly interchanged. Lithium battery and nickel-cadmium battery installation box and external interface are the same.
Tyrant gold installed battery pack, each battery capacity 200Ah; nominal voltage 110V. The whole train has a total of 4 battery packs. Initial joint deployment of the vehicle has been completed in Changchun. Subsequent trials in the ring iron test base into the general test run and related experiments. The entire vehicle experiment is expected to be completed by the end of 2016.
First, simply list a few data. The standardization is based on the North-South vehicle model, so the parameters are the same:
1. Train running speed: 350km/h
2. Form of grouping: 8 cars, 4 moves and 4 drags
3. Capacity: 556 people
4. Length, width and height: 209m*3.36m*4.05m
5. Axle weight: 17t
High-speed rail is definitely a synonym for tall. How many mathematical formulae are listed, how much data can't be intuitively understood. Therefore, I would like to simply say one point: Each train of high-speed trains has a design service life of more than 30 years. From the manufacturing to the downline, the test run mileage is 300,000 kilometers (empty run in the first 100,000 kilometers, load test run in the middle of 100,000 kilometers, manned experimental run in the latter 100,000 kilometers) to deliver the owners. The concept of 300,000 kilometers is that a car runs away, so that a high-speed train is delivered to customers.
It can be imagined that the requirements of a high-speed train for fittings are absolutely rigorous and almost rigorous. The rail transit industry output will never be as large as hundreds of millions of cars a year, but the requirements are harsh. The quality system implemented is different from the car. The car performs TS16949. The rail transit performs RAMS.+IRIS.
The rapid development of high-speed rail. It is not an exaggeration of China's rail network, or even a high-speed rail network that is being operated and planned. Is one of the world's leading, attention, leading, no one.
The train is demanding because of his high speed. There have been news reports that there was an accident at a speed of 160km/h and the vehicle’s death rate was 100%. The speed of this rail transit is just the speed of an ordinary express train. The design speed of high-speed rail is 380km/h. So we will often see rail trains 380A/AL; 380B/BL; 380C; 380D and other high-speed rail models. Because of the vast geographic area in China, the climate difference between the north and the south will appear to be cold and heavy. Imagine a rail train from Guangzhou to Harbin. The south needs cooling and cooling, and it needs various warmths to the north.
All over the terrain. Changes in air pressure at the high speeds of cars and tunnels. Enough to shatter all the window glass. Interested readers can search on their own. At the beginning of high-speed rail R&D, when the two cars cross each other, they have experienced crushed cracks in all windows, which is equivalent to an explosion in the car.
This problem was quickly resolved in the hands of our national engineers. The protection of personal safety in the carriage. Bogies on bogies use the world's leading air suspension technology. All aluminum alloy body, to ensure strength while reducing weight. Ensure the body is sealed. Give passengers the most comfortable feeling.
But on the other hand, outside the car? All the equipment on a high-speed train is generally suspended on the bogie. A variety of harsh environments and the impact of high-speed direct face and equipment. Therefore, the stability, safety, and consistency of the equipment are higher.
In general, when the car fails, turn on the fault light and wait for the rescue. People can leave the body to avoid secondary accidents. However, the track train armpits are classified as different grade accidents based on the length of stay. You have to know that the track can't take you to an accident car. Even if it is a few minutes, the high-speed track is even worse.
Say so much, nothing more than to illustrate a problem, the reliability of railcars, the quality of each product component is very high. Second only to the plane flying in the sky. No one can run on the ground.
Coincides with this, during the off-line period, I also conducted experiments at the Institute of Iron and Steel and I was privileged to visit two lines of marking down the line. As a participant, the train probably only talks about personal feelings and experiences. The following is a brief discussion on the use of lithium batteries on high-speed rails.
What is the difference between a nickel-cadmium battery and a lithium battery?
The nickel-cadmium battery used as a conventional train .
advantage:
1. High safety, overcharge and over discharge.
2. Good high and low temperature performance. The use of temperature range -20 °C ~ 60 °C, in this range can be discharged.
3. Affordable. The number of cycles is about 500 times.
Disadvantages:
1. Low energy density.
2. Nickel-cadmium is a heavy metal that pollutes the environment.
3. The memory effect of a nickel-cadmium battery is repeated after several times of maintaining a low-capacity discharge. If a large amount of discharge is required, the battery will not function.
4. The battery needs regular maintenance, such as adding electrolyte.
5. The self-discharge rate is high, and the nickel-cadmium battery is 15 to 30% (months).
The train uses lithium batteries.
advantage:
1. High security, not overcharge and overdischarge, need to be equipped with BMS battery management system.
2. Good high and low temperature performance, the use of temperature range -20 °C ~ 60 °C can also be used, even -40 degrees can also be low rate discharge.
3. High energy density, current technology is about three times that of nickel-cadmium batteries. The number of charge and discharge is 3000~10000 times.
4. Little impact on environmental pollution.
5. Free regular maintenance.
6. The self-discharge rate is small. Lithium batteries are 2 to 5% (months).
Disadvantages:
The current procurement costs are higher than nickel-cadmium batteries. According to industry development and capacity expansion, there is room for continuous price reduction.
High-speed rail lithium battery meaning? What is the role of lithium batteries in high-speed rail?
From the above comparison, it is not difficult to see that the use of lithium batteries in high-speed railways has positive significance.
Any car, even a fuel car, has a battery. The role is self-evident. Although the track train generally uses the grid to run without burning oil, it still needs a backup power supply. It is used to provide low voltage power supply to various components of the vehicle. For example, when the power grid is suddenly turned off, the interior lighting, air conditioning, etc., the charging and lowering of the charging bow when the train starts.
At present, the north and south of the two off-line sample cars, North Railway Changchun Railway Vehicles - Typhoon gold is used on lithium batteries. It is also possible to compare this with a nickel-chromium battery on the CSR quadrilateral train as an operating parameter. At present, related experiments are still underway in the Institute of Iron Works.
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