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Charging pile knowledge science: Do you really understand the charging pile?
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Time：2018-05-16 11:44:47
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New energy vehicles are now rapidly developing with the support of the state and the government. More and more people are buying new energy vehicles. Charging piles are an important infrastructure for new energy vehicles. As a result, they have developed rapidly. Currently, China's charging infrastructure is public. The number of charging facilities is the highest in the world. But do you know what charging pile is? Do you understand it? The electric car resource network has organized some related knowledge of charging piles, and today we have come to understand it with Xiaobian. What is a charging pile? Charging piles, as the name suggests, are used to charge our electric vehicles. Its role is like fueling stations in fueling stations for fuel vehicles. The charging pile can be fixed on the ground or fixed on the wall, installed in major public spaces, residential areas and charging stations, and then it can be used to charge various types of electric vehicles according to different voltage levels. People can use a special charge card to swipe the card on the human-computer interaction interface provided by the charging pile, carry out corresponding charging methods, charging time, cost data printing, etc. The charging pile display can display the charging amount, cost, charging time, etc. data. How to charge the charging pile? Charging an electric vehicle with a charging post actually charges the battery in the electric vehicle. The principle of charging is that after the battery is discharged, it passes through the battery in the opposite direction of the discharge current with a direct current, so that it can recover its working capacity. This process is called battery charging. When the battery is charged, the positive pole of the battery is connected to the positive pole of the power source, and the negative pole of the battery is connected to the negative pole of the power source. The charging power supply voltage must be higher than the total electromotive force of the battery. In general, there are two kinds of charging methods for charging posts, namely constant current charging and constant voltage charging. In the new version of the electric vehicle that was implemented on May 1, the two charging methods are defined respectively: constant current charging, A controlled constant current to charge the battery; constant voltage charging, charging the battery with a controlled constant voltage. So what is the constant current charging and constant voltage charging? The following is the author's understanding of these two charging methods in more detail. Constant current charging method: Constant current charging method is to adjust the charging device output voltage or change the series resistance with the battery, to maintain the same charging current intensity charging method is simple, but because the battery's current capacity is acceptable with the charge As the process progresses, it gradually decreases. At the end of charging, the charging current is mostly used for electrolyzing water, generating gas and causing excessive gas flow. Therefore, the stage charging method is often used. Constant voltage charging method: The voltage of the charging power source maintains a constant value throughout the charging time. As the terminal voltage of the battery gradually increases, the current decreases gradually. Compared with the constant current charging method, the charging process is closer to the optimal charging curve. Quick charge with constant voltage. Since the battery has a low electromotive force at the beginning of charging and the charging current is large, the current will gradually decrease as the charging progresses. Therefore, only a simple control system is required. What kind of charging pile? Currently, there are two types of charging poles commonly available in the market. One is a DC charging pole and the other is an AC charging pole. DC charging pile: DC charging piles are fixedly installed in some public places outside electric vehicles, such as residential quarters, residential parking lots, commercial areas, service areas, outdoor parking lots, electric vehicle charging stations and other places. It is a kind of access through public Grid, a charging device that supplies DC power to non-vehicle electric vehicle batteries. Because the DC charging pile can directly charge the battery of the electric vehicle, the three-phase four-wire system or the three-phase three-wire system is generally used for power supply, and the output voltage and current can be adjusted in a wide range. Therefore, the AE power AC charging pile: The AC charging pile is also fixed in some public places outside the electric vehicle. It provides a controlled one-way AC power supply or three-phase AC power supply for the electric vehicle's on-board charger. It should be noted that the AC charging point It does not have its own charging function. It simply provides power output. By connecting an electric vehicle's on-board charger, the battery of an electric vehicle can be charged. Since the power of the electric vehicle-mounted vehicle charger is generally relatively small, the AC charging pile cannot be quickly charged, and the AC charging pile is also referred to as slow charging. AC charging pile output power will not be very large, generally 3.5kW, 7kW, 15kW and so on. Difference: There are two differences between DC charging pile and AC charging pile. When charging, the DC charging pile can directly charge the battery of the electric vehicle. Therefore, no car charger is needed, and the AC charging pile cannot directly give the battery of the electric vehicle. Charging, so you need a car charger. The second difference is the difference in charging duration. The charging speed of DC charging piles is faster. It usually takes tens of minutes to two or three hours to fully charge an electric vehicle battery. The time required for an AC charging battery to fully charge an electric car battery is Longer, it usually takes about eight hours.
