Jiangsu Express Station put into operation and took the lead in realizing the use of electric car batteries

On May 4, in the Liuhe service area of Nanjing, Jiangsu Province(Changchun direction), four new car charging parking spaces are neatly arranged under huge photovoltaic panels. Each parking space is equipped with a charging pile and a black electric car is charging..

On April 30, the first electric vehicle retired battery in Jiangsu Province was applied to the project of photovoltaic energy storage at the charging station, the Nanjing Liuhe Service Area Express Station, and was the first to realize the echelon utilization of electric vehicle batteries. "Unlike in the past, the power that the station recharges for the vehicle was partly generated by photovoltaic power generation, and the photovoltaic energy storage cell was derived from the retired battery of an electric car, which constitutes the self-circulation of the power of the charging station. "Nanjing Power Supply Company Electric Vehicle Service Branch head Yangjianping introduced. It is understood that China has been ranked first in the global production and sales of new energy vehicles for three consecutive years. By the end of last year, China had promoted more than 1.8 million new energy vehicles. Nanjing has developed 26,900 vehicles of various types of new energy vehicles, accounting for more than 30 % of the province's total, and the cumulative development volume ranks first in the province. Among them, compared with 2016, the number of new energy vehicles in 2017 has achieved a quantum leap, with a total of 14,400 vehicles, which is four times that of 2016. New energy vehicles are becoming a new choice for more people to buy cars.

The expressway service area has relatively abundant site resources and location advantages that are relatively small and far from the main network. This time, Nanjing Power Supply Co., Ltd. built 4 car charging parking spaces(8 long-term plans), a 630 kVA box Transformer, and 4 120-kilowatt split DC charging motors in both directions of the Changshen Expressway Liuhe service area. One machine double pile, each charging pile corresponds to one parking space; The photovoltaic system is arranged above the canopy of the charging parking space and adopts box-type energy storage equipment and is placed outdoors. The energy storage capacity is 50 kilowatt-hours and the photovoltaic capacity is 10 kilowatts. A photovoltaic power generation unit with a capacity of about 12 kilowatts is built on the canopy of the charging parking space, and a terraced utilization cell with a capacity of 50 kilowatts x 2 hours is equipped. The power station is equipped with an integrated energy management system, which can control the energy flow of the energy storage unit according to the peak and valley periods and charging conditions, realize the functions of peak filling, power utilization, and new energy dissipation, improve the reliability and economy of the system operation, and have strong practicality. And replicable.

The distributed photovoltaic and energy storage hybrid power generation system constructed by the project is operated in conjunction with the distribution network to supply power to the charging station. The joint operation mode can be set in a variety of ways: PV power generation supplies power to the charging station, residual power access to the Internet, and the gap is supplemented by the power grid; Photovoltaics power generation for the charging station, the residual power does not access the Internet, the gap is supplemented by the power grid; Combined with peak and valley electricity prices, peak power access to the Internet, Valley power from the grid; New energy power generation is dispatched by the power grid to control the power of the Internet.

In general, power cells with a capacity of less than 80 % can no longer be used in new energy vehicles. Taking into account the use of the environment and other comprehensive conditions, the average life expectancy of power cells is 5 to 7 years. Judging from the current application of new energy vehicles, by 2020, the total scrap volume of electric vehicle power batteries in China will reach 120,000 tons to 170,000 tons. These batteries that can not be used by electric cars are not completely lost in value. Theoretically, they can also be used for power storage or related power base stations, street lights, and low-speed electric vehicles depending on the battery capacity. Finally, it enters the recycling system. This is the echelon use of power cells. The use of power battery echelons is in the ascendant in the field of research at home and abroad. Many universities and research institutes have Hedongli battery manufacturers with research results or demonstration projects. Jiangsu Electric Power Research Institute also has demonstration projects for application. In addition, Nanjing Power Supply Company has built interactive content such as remote video monitoring, remote voice assistance, remote assessment of equipment status, monitoring of environmental indicators, and navigation within the station to increase the level of interactivity.

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