电动汽车-续航-英语论文.docx

Title:电动汽车的续航问题研究 Research On The Endurance Of Electric VehicleOutline1 Introduction1.1 Research Background1.1.1 Definitions of Super capacitance andLithium-ion battery1.1.2 Research at home and abroad1.2 Research Framework1.2.1 The Method of Super capacitance andLithium-ion battery1.2.2 Research Question and Significance2 Research Results3 Analysis and Interpretation4 Conclusion5 References1 IntroductionElectric cars now encounter a very annoying problem - battery life. Now by the Chevrolet Motor Company production of automobile volt cars in the pure electric case (without lights, air conditioning), can be normal travel about 80 km, calculated in accordance with modern city life, everyday traveling is approximately 40 km operation. But if we in accordance with the normal wear and tear, after a number of years, the battery will be not so high performance like before. Whats more, a charging need for about five hours, so its not suitable for long distance driving, volt named as increases the range of hybrid electric vehicle, meaning that when the battery power loss, gasoline engine starts working, to charge the battery, this car can continued life about 570 km. In summary, the Chevrolet volt car actually takes the gasoline engine as the main body, motor as subsidiary bodies to life, indeed so can reduce emissions for the purpose of, but the pollution continues and just delays. At the same time, including Lexus ct200h and the Roewe 750, BYD E6 and most of the electric car on the market have not gotten rid of the gasoline engine as the main body of the basic concept, but an increase of the basic components of an electric car, but still a car living gasoline. Although now automobile use the brake energy conversion into electrical energy, and in order to store in power in the trunk, take the power to electric drive, in fact, these are not from practical condition to solve the battery driven, because in order to convert the electrical energy is limited, we need to continuous electrical energy consuming. But now we have some new thoughts about the life of battery- Super capacitance, Fast charge technology and Charging pile and so on.1.1 Research BackgroundWith the gradual depletion of oil, our country and even the whole world are more and more attention to the development of new energy vehicles such as the electric car. But the car is so huge, and now the single battery capacity is still cannot reach the electric car design standards, so its very worth studying that how can we solve the problem of electric vehicle battery life.1.1.1 Definitions of Super capacitance andLithium-ion batterySuper capacitance which is developed by the polarization of the electrolyte to the storage of electrochemical element is an electricity storage device. It is different from the traditional chemical power supply, it is a kind of power which is between the traditional capacitor and battery, and has special performance, which mainly depends on the electric double layer and the oxidation and reduction of the charge stored energy of the pseudo capacitance. But in the process of its energy storage is not a chemical reaction, the process is reversible, it is because the super capacitor can be repeatedly charge and discharge hundreds of thousands of times. The basic principle and other types of electric double layer capacitors are the use of activated carbon and electrolyte composition of the double layer structure of the double layer structure to obtain a large capacity.Lithium-ion battery is a rechargeable battery, which depends mainly on the lithium ion between the positive and the negative electrode to work. In the charging and discharging process, the Li+ is embedded between the two electrodes. When charging, the Li+ is removed from the positive electrode, and the cathode is in the rich lithium state after the electrolyte is embedded. Battery generally uses a lithium containing material as the electrode, which is a modern high performance battery generation.1.1.2 Research at home and abroadIn our country, BYD is the leader of electric vehicles research. He was the first car manufacturer to launch an electric car in China.But in the another country, Tesla of Silicon Valley has the most advanced technology of electric car in the world, their car can keep moving 300 kilometers and more without charging.However, littleattentionhasbeenattachedtotheissuethat does it is limited in our car that we only can create an electric car with 300 kilometersThis paper intends to explore such a question: how to increase the life of electric car.1.2 Research Framework1.2.1 The Method of Super capacitance andLithium-ion batteryThe running vehicles whose changes are very huge need frequent acceleration and deceleration, the frequent charge discharge should is the strengths of the super capacitor, super capacitor is the physical reaction, fast charge and discharge are high efficiency, it has good reliability, and the control system requirements is not high, if let the super capacitance play power frequent input and output function, the super capacitor and battery which have their respective advantages can be fully play out, electric cars are demanding requirements for the battery itself, so you can through the super capacitor to avoid the problem.11.11.21.2.11.2.2 Research Question and SignificanceQuestion 1: Why our electric cars is unsatisfactory now.Question 2: In which way can we solve the problem of the battery life?Research Significance: To this research, we can discuss some way to improve the life of electric vehicles batteries. As we know, electric car is the development direction of the future, and with the gradual depletion of traditional power, air pollution in big cities of our country couldnt be ignored. 16 cities in China were included in the worlds most serious air pollution in 20 cities. In our country, car ownership is per 1000 person average 10 cars, but with the development of economy and the lack of petroleum resources, and the situation of having been imported tens of millions of tons of oil, if Chinese Automobile Holdings at the global level. Every 1000 people have 110 cars, Chinas car ownership will become 10 times increase, oil imports will become a big problem. Therefore in our research and development in electric car are not a temporary short-term measures, but a significant, long-term strategic considerations.2 Research ResultsTo our research, there are 4 reasons that why our electric cars is unsatisfactory now.First, continued driving mileage limit.Electric vehicles used in the current market after a charging mileage is generally 100-300km, and this figure is usually required to maintain the appropriate speed and a good battery regulation system whichs to be guaranteed, and the vast majority of electric vehicles in general driving range is only 50-100km. Comparing with the traditional fuel vehicles, electric vehicles continuing driving miles become its fatal weakness.Second, the battery life is too short.Ordinary battery charge and discharge times only have 300-400 times, even though the performance of the battery charge and discharge number is only 700-900 times, according to the research, the annual charge and discharge perhaps are 200 times and a battery life usually is 4 years, compared with the life of fuel vehicles the electric cars lives are too short. In addition, different types of batteries have their own advantages and disadvantages in performance. For example, the low cost of lead-acid battery, rich in raw materials and easy to recycle, but continued driving mileage is short, accelerating power difference and life is short. Nickel cadmium battery accelerated enough power, long life, but its high cost, poor Recyclable. Sodium sulfur battery is higher than the energy, can provide a longer range, but it requires the working environment is more demanding, and its active material has a strong corrosive and explosive. On the whole, the life of the mature battery is relatively shorter.Third, battery size and quality control.The batteries used by the existing electric vehicles cannot maintain reasonable size and quality in the premise of storing enough energy. If the electric vehicle itself is equipped with a large mass, it will affect the performance of the acceleration and the maximum speed of the vehicle. For example, the volume of the existing electric vehicle battery generally reaches 550L, when to use such a large volume of batteries for family cars, obviously it will squeeze the car trunk space.Forth, indirect pollutionThe electric vehicle has no pollution, but its indirect pollution cannot be ignored. Such as lead in lead acid battery, from mining, smelting to the production of sewage, will cause pollution to the environment. As for electricity, a large part from coal, coal fuel will also cause air pollution.So how can we solve the problem of the battery life?First, use the super capacitance to cooperate with the lithium-ion battery.As said before. super capacitor is the physical reaction, fast charge and discharge are high efficiency, it has good reliability, and the control system requirements is not high, if let the super capacitance play power frequent input and output function, the super capacitor and battery which have their respective advantages can be fully play out, electric cars are demanding requirements for the battery itself, so shall we let super capacitance and lithium-ion battery work together?Second, use wireless charging.In todays wireless charging technology, we can ensure that the 95% transmission effect of a meter distance, and the charging is particularly fast, after a few seconds we can start charging, so why not put the charging line buried in the underground road, the car will be charged while walking.Third, building the charging pile network.At present, our countrys oil gas stations have been spread all over the country, even in the Tibet area which in the average elevation of 5000 meters. We can build the charging pile network in the gas stations, and in some large and medium-sized cities have begun to have such a prototype.3 Analysis and InterpretationThis is a mileage data contrast table:To the results of the research and this table, Tesla model S is the 1st, and his way of reaching this goal is to stack battery and using super capacitor with lithium ion batteries. As I said, let the super capacitance play power frequent input and output function, the super capacitor and battery which have their respective advantages can be fully play out, electric cars are demanding requirements for the battery itself, so you can through the super capacitor to avoid the problem.4 ConclusionAt this stage, the way to solve the problem of electric cars lives is to use the super capacitance to cooperate with the lithium-ion battery. super capacitor is the physical reaction, fast charge and discharge are high efficiency, it has good reliability, and the control system requirements is not high, if let the super capacitance play power frequent input and output function, the super capacitor and battery which have their respective advantages can be fully play out, electric cars are demanding requirements for the battery itself. Then use wireless charging. Wireless charging technology, we can ensure that the 95% transmission effect of a meter distance, and the charging is particularly fast, after a few seconds we can start charging, so why not put the charging li