With the increase in the number of pure electric vehicles, how to charge has become an unavoidable issue. Taking Beijing, Shanghai, Shenzhen, and Guangzhou as examples, although the number of charging stations it builds is extremely impressive, it can be used to query charging piles through various APP and search software, which greatly facilitates the use of pure electric vehicles, but also Just solved the problem of charging, and did not solve the biggest obstacle to charging speed.
The energy storage devices used in pure electric vehicles are lithium batteries. The length of charging time is determined by the charging pile. Charging using a quick-charged charging post will take between 1 and 2 hours. If a slow charger is used, the charging time is extended to 8 to 16 hours.
However, even if the charging is performed using a quick-charged pile, it is indeed too long compared to the time it takes for the fuel tank to refuel. Today's fuel tanks are mostly equipped with fuel tanks of about 60 to 70 liters. Once full oil is available, vehicles can travel 600 to 1,000 kilometers and the refueling time is less than ten minutes. If you want to fill a 60kw/h or even 80kw/h lithium battery pack within ten minutes, it will inevitably cause a sharp increase in the internal temperature of the battery. If you accidentally cause damage to the battery structure, the battery capacity will drop rapidly.
So, is there a battery that can be charged quickly without harming the battery itself? Of course, such as flywheel batteries. The flywheel battery is a pure physical battery. It stores energy through a high-speed rotating flywheel, and then it is charged or discharged by a series motor. Since there is no chemical substance, there is no need to worry about the damage caused by the excessive current, and only the motor can withstand the generated Current is OK, which is not a problem for mature motor technology.
However, the disadvantages are also obvious. Due to the very high speed of rotation of the flywheel, a flywheel of 250,000 revolutions per minute has been produced. Therefore, it is sensitive to the operating environment and must be operated in a vacuum environment. It also requires the use of magnetic bearings. To support the flywheel and how much the bumps can cause instability in the operation, there is still room for improvement.
If the problem of charging speed is solved, the time for charging the vehicle will naturally be shortened, and the use efficiency of the charging pile will be greatly improved. At that time, the electric vehicle entering the charging station is like a fuel vehicle entering a gas station, and can be divided into minutes. Fill the electricity. At this point, the length of the car's cruising range is not so important, and more charging stations can be used to make up for it.
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