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Consideration On Standardization Of Electric Vehicle Charging And Switching Facilities
Apr 07, 2017

With the increasing of electric vehicle propulsion at home and abroad, the technical route of EV has diversified development, standardization and safety are more and more valued. The author considers the standardization and safety of electric vehicle charging and exchanging facilities.

First, the safety of electric vehicles is not only the safety of the whole vehicle, it is necessary to grasp the overall system security. Car safety has always been the primary concern and focus on the automotive industry. Because of the characteristics of electric vehicle driving, its security has increased many different key elements. such as the safety of infrastructure construction, the safety of user electricity, the mutual security effect between power grids and electric vehicles.

Take the most of the charge you talk about as an example analysis. Chinese few households have two cars, basically a car multi-purpose, large city high-rise buildings, charging facilities can not be built everywhere, charging piles not only difficult to install, more difficult to safety management, incomplete telephone booth is a model. Also, when the operator starts from picking up the charging connector, the security problems of each link begin to emerge. Is the charging pile leakage? Does the plug leak? is the plug connected properly? is charging automatic detection normal? Is the electric control system, battery and management system in the process of charging normal work? is the power grid stable? Is the weather good when charging? How to ensure the safety of the property in the charging process after the owner's departure? and so on. The emergence of each problem can cause personal injury, causing damage to the equipment of the car and charging piles, and the fault of the power grid.

Therefore, the safety of electric vehicles is no longer the safety of the whole vehicle, and the safety of the charging and the electrical facilities itself, the safety of the electricity-charging process and the safety of the grid are closely related. We should grasp the safety of electric vehicles with the viewpoint of system management, abide by safety first, prevention, and comprehensive management. To protect the person, the equipment (car, charge-to-electricity equipment), security of the power grid as the first job to grasp, the formation of effective high-voltage electrical and low-voltage power safety Assurance system and supervision system, effective prevention of various electrical failures, safety work to achieve controllable, in control.

Second, China needs more standardized products in line with China's national conditions. At present, the United States, Germany, Japan and other countries of the big cart enterprises with their own main models put forward the corresponding charging concept, the introduction of solutions, and promote the rise to international standards, which is conducive to our learning from other countries for reference. However, the world's market for electric vehicles in China, charging problems are also in China. China's national conditions are too complex, unlike the big car, foreign auto companies may not be able to copy the program. For example, a few foreign manufacturers to promote the quick charging scheme, in fact, is man-made design, lack of empirical. Battery as a mature product application and electric vehicles in the next three years will not have a fundamental breakthrough is the world's mainstream consensus, the fast charging does affect battery performance and longevity, in the US Nissan the hearing of the wind is also questioned by battery life, while the rapid charging method does not take into account the impact of the power grid, power quality and safety. The exchange of several foreign vendors, including Toyota, has emerged as a consensus after the previous phase of time. For example, from the completion of the charging function, AC/DC charging integrated or modular interface standards for the vehicle and the driver is convenient, but also has its own rationality and economy. However, an interface design, especially the factor it considers as an application part, is far from simple. The problem is that the adaptability of this interface is debatable when the vehicle model diversification, technology route diversification, market demand multi-level, and no production stage, the second, the battery cannot satisfy the large current fast charging situation, the DC AC mixing in a cable needs to increase the two-DC wire core carrying large current, different charging current sizes, and the different diameter of the line, resulting in the design and manufacture of complex and material waste; Again, this design is only considered from the point of view of charging, Lack of understanding of the power grid link in the charging scheme, the external power supply of charging piles must be designed according to the maximum power capacity, and the corresponding power facilities should be improved progressively; Due to the maximum demand power configuration, power grid equipment and power generation equipment increased a lot of redundancy, power system needs to increase investment.

Realistically speaking, China's traditional automotive technology has long lagged behind, lack of discourse power, now to the electric vehicle, this phenomenon is still continuing. But the difference between electric cars and traditional cars is the supply of energy. Fuel is stored in petrol filling tanks, and electricity is basically not stored beforehand, electricity is a special commodity, power generation, transmission and electricity at the same time. So, the power system, power facilities, power regulation, power operation, electricity pricing mechanism have many differences, and the electricity is different naturally. Over the past few years, China attaches great importance to the standardization of electric vehicle infrastructure, has completed the power-charging facilities related GB 13 items, row mark 17 items, forming a system standard system. At the same time, our country's electric technology, ordered charging technology, intelligent charging and switching management, three-network integration of Intelligent Service Network infrastructure construction scale and program are richer, more practical and more effective than abroad. Therefore, in accordance with foreign national conditions and ideas of the design of electric vehicles and products to China, more should be based on the application of China and empirical, to make improvements and adjustments to adapt to China's national conditions. In short, the relevant industries at home and abroad should strengthen exchanges and cooperation, through standardization efforts to promote consensus and cooperation.

Thirdly, grasp the relationship between the standardization management of EV and the development of quantity, quality and direction. Our country has determined that pure electric drive is the strategic direction of electric vehicle, its more profound significance is to reduce the dependence on fossil energy, to ensure the inevitable demand of energy security in China, is to reduce the serious environmental pollution, benefit future generations, promote eco-civilization construction of important measures; Standardization should focus on this, supporting and promoting the development of electric vehicles. However, in the pilot demonstration of the process of advancing, affected by various factors, individual places appeared to pursue the completion of new energy and energy-saving vehicles quantitative indicators, vigorously promote the situation of hybrid vehicles, especially a large number of hybrid bus rapid advancement. As we all know, some major automotive industry is based on the passenger car system, our country's urban transport policy is to vigorously develop public transport. Pure electric buses in the city run, whether from energy consumption, emission, or technical maturity and product competition, or business model and comprehensive economic benefits, have accumulated rich experience. With pure electric as the orientation, to change the mode of power-based and the development direction of a high degree of agreement, has been recognized at home and abroad, "electric vehicle electrical equipment security Requirements" International standard proposal to obtain the IEC adoption. If the transition is driven by a mixture of power, it is actually options, the end of the house, and the length of the shed, resulting in various losses. On the contrary, scientific and objective technical and economical comparisons, focusing on the development of pure electric vehicles, especially electric buses, avoiding detours and backward, can create the conditions for China's pure electric vehicles, the Chinese Pure electric vehicle standardization to the world lay the foundation.

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