Recently, with German Chancellor Angela Merkel's visit to China to sign the agreement on the unified power supply interface between China and Germany, the country officially announced the exemption of pure electric vehicles and qualified plug-in (including extended-program) hybrid and fuel cells. A series of milestones such as the purchase tax of three types of new energy vehicles have occurred, and new energy vehicles have once again been placed under the spotlight. Thanks to Musk's excellent business operations, Tesla has shown a difficult situation when it is listed. Although the high price makes Tesla far away from the ordinary people, the overwhelming publicity has already made Tess Pulling is well known to women and children. It is because of the star effect of Tesla that a pure electric car became the brightest star of different types of new energy vehicles. But can a pure electric car really become the most suitable substitute for a traditional car? I don't think so.
The definition of a pure electric vehicle is actually very broad. From the literal point of view, a vehicle that uses an electric motor as an output power can be defined as a pure electric vehicle. For example, the tourist vehicles we occasionally see in the scenic spots, such as the old-fashioned old scooter, such as the pure electric bus, the Chevrolet Volanda using the extended-program hybrid system, and the world-famous Tesla. Then, Toyota will soon be mass-produced FCV fuel cell vehicles. From the perspective of the power system, these vehicles belong to the category of pure electric vehicles, and the electric motors are also provided in the driving force. But why these cars have opened up a huge gap in the strength of science and technology, the secret of which is the battery and power management system that powers the electric motor. Old-time scooters and tourist vehicles, such as low-cost electric vehicles, use the least technical power system, lead-acid batteries and three-phase asynchronous motors that can be purchased everywhere, plus a reducer. You're done. The extended-range hybrid vehicle represented by Volanda is powered by an internal combustion engine for high-energy-density batteries, which in turn provides motor operation, and the internal combustion engine is not directly involved in power output. Tesla uses a charging pile to charge the lithium battery to achieve power supply. The last fuel cell vehicle supplies energy to the motor through a fuel cell. Obviously, the pure electric vehicle of the old scooter mode does not have any promotion value, and the existence is just a waste of resources. In a broad sense, the definition of a pure electric vehicle should be based on a high-energy-density battery as a power source, and a charging model can be used to charge the vehicle. As for the fuel cell vehicle and the extended-range hybrid vehicle, it is not within this range. So next we will focus on the pure electric car that needs to be recharged.
For a cordless electric vehicle, the source of power depends entirely on the battery's power. To run fast, you need a high-powered high-speed motor. High-power high-speed motors require high-energy-density batteries. High-energy-density batteries rely on power management systems. It's not difficult to find a high-powered high-speed motor, but it's really a headache to find a matching battery. Therefore, when the pure electric vehicle develops toward the current high speed, it is not the performance of the electric motor but the performance of the battery that limits the performance of the pure electric vehicle. The four problems of cruising range, charging time, battery life and the number of basic charging piles restrict the development of electric vehicles. Due to these four problems, electric vehicles are also destined to become temporary replacement tools for short-distance transportation within the city. By borrowing the opinion of Honda’s president, Idong Takahashi, pure electric vehicles can only meet short-distance movements in specific environments.
Let's talk about the cruising range. From the current electric models that are currently being sold, Tesla claims to have a cruising range of 500 kilometers, BMW Brilliance has a cruising range of 150 kilometers, and BYD E6 has a cruising range of 280 kilometers. From the book data, it seems that except for Tesla, these electric vehicles still do not meet the current standards for internal combustion engines. The reason why Tesla can reach 500 kilometers of cruising range is also due to its lithium battery of up to 7,104 knots. These batteries, which are almost entirely from laptops, also give Tesla the same cruising range as laptops. Instability. The official 500-kilometre cruising range is theoretical data given at constant speed, constant temperature, no air conditioning, no full load, and so on. In reality, it certainly cannot run for 500 kilometers. Just like a smart phone, if you just wait for more than one day, you will have no problem, but if you will chat on WeChat for a while, and then come to a small movie in the depths, it will definitely be finished in minutes. Similarly, for an electric car like Tesla, there is no problem with the slow cruise, but if the foot is a little bit awkward, it is waiting for the rhythm of the cart. Even Tesla, it is quite good to reach a cruising range of 300 kilometers in ordinary daily life. From the point of view of the cruising range, the electric vehicle is only suitable for use in a limited range, and the long distance is basically not considered.
Of course, the problem of endurance can continue to improve with the advancement of technology. If it is too big, continue to add batteries. But the problem lies in the charging time, the greater the battery energy density, the longer the charging time required. In the case of Tesla, it takes 30 hours to charge when charging with ordinary household power. Using an integrated 10 kW charger takes ten hours to fill, using an integrated 20 kW charging ground that takes five hours to fill. Use a super charging post to fill 80% of the battery in 45 minutes. It can be seen that even the fastest charging method, Tesla needs at least 45 minutes to get enough power to ensure daily driving. In contrast, the time for a conventional internal combustion engine car to fill a tank of oil is at most five minutes. The charging time is too long, so that the electric car can only perform some leisure travel tasks. If it is really fast, the electric car can still be considered.
The other is the battery life, just like the mobile phone, the battery life of the battery will be discounted if the time is long, and repeated battery charging will damage the battery life. Similarly, the battery of a rechargeable pure electric vehicle will gradually lose its vitality as the use time increases. In view of the amazing charging time of electric vehicles, most of the most worried car owners will choose the fast charging mode for the car, especially in the case of public charging piles. This further exacerbates the loss of the battery. At that time, the cost of replacing the battery should be high, and how to deal with these used batteries is a headache. A slight inattention will cause serious environmental pollution.
Finally, the number of basic charging piles, although the Sino-German unified charging interface for electric vehicles, there are no clear rules on how to popularize charging piles and popularize the cost of public charging piles. How many charging piles are arranged in one city, how to set up charging piles in remote areas, etc. are all popularized problems of charging pure electric vehicles. The popularization of public charging piles nationwide is actually the establishment of a completely new system, the difficulty can be imagined.
The above problems have restricted the charging-type pure electric vehicle is destined to be only a transition in the wave of new energy revolution of the automobile. The role of the rechargeable pure electric vehicle is more to promote the revolution of the power management system and the motor technology. The value is not really big. The final result of the new energy revolution must belong to fuel cell vehicles. Compared with the rechargeable pure electric vehicle, the fuel cell vehicle completely overcomes the problems of short battery life, long charging time, short battery life, and lack of basic charging facilities. First of all, the problem of endurance ability, fuel cell vehicles through hydrogen fuel to achieve fuel cell power generation directly to the motor, hydrogen fuel cell energy conversion efficiency can reach 80%, there is no loss in the operation of the transmission battery in the middle, the use of energy It is more efficient. Moreover, limiting the endurance of the vehicle is the amount of hydrogen fuel, and as long as there is a large fuel tank, the cruising range can be increased. Not long ago, a mass-produced fuel cell version of the ix35 set a record of 700 kilometers of fuel. In terms of charging time, the fuel cell vehicle does not need to be charged. All that is needed is to add hydrogen fuel. The time for adding hydrogen fuel is the same as that of the current fossil fuel, and it can be done within three to five minutes. In terms of battery life, the fuel cell is actually a small power station, and naturally there is no excessive life-threatening problem. Finally, in terms of the popularity of infrastructure, the construction of hydrogen fuel filling stations can be fully expanded on the basis of the existing gas station system. The only gas station needs to be added is a hydrogen fuel storage tank and the corresponding filling machine. Rechargeable pure electric vehicles need to build a completely new system to be more feasible.
It can be said that most of the problems existing in the rechargeable pure electric vehicle are contrary to the automobile usage habits in the existing automobile society, and the lack of related infrastructure construction also limits the popularity of the rechargeable pure electric vehicle. This type of model is destined to become a transition in the new energy revolution. It is the ultimate value of its existence for the subsequent fuel cell vehicles to provide technical accumulation of power management and to popularize the public's green travel awareness.
Isostatic Graphite Block,Graphite Block---Isostatic Graphite,Graphite Block For Edm Application,Artificial Isostatic Pressing Graphite Block
CARBONS TECH&CREATION(HENAN) INDUSTRY CO.,LTD , https://www.kygraphitematerial.com