aaa battery alkaline

　　aaa battery alkaline technology continues to make breakthroughs, charging electric vehicles will not be a problem

　　It is reported that at centralized charging stations in Shenzhen, more and more electric vehicle drivers are using charging pile equipment compatible with multiple powers to charge their vehicles. In addition, with the continuous breakthroughs in power aaa battery alkaline technology, the energy density and power density of lithium batteries have increased in parallel, which on the one hand has improved the driving range of electric vehicles, and on the other hand has made the refueling time comparable to that of fuel vehicles. "Fast charging" is possible. In the accelerated iteration of technological innovation, electric vehicle users are gradually bidding farewell to the long-standing "charging anxiety".

　　"Power sharing" charging pile solution

　　Matrix flexible charging pile technology can not only meet current aaa battery alkaline charging needs, but also meet future "aaa battery alkaline upgrade" needs, avoiding the repeated dismantling and construction of charging piles.

　　As of the end of last year, my country had 450,000 charging piles of various types, 14 times the number at the end of 2014, and the national vehicle-to-pile ratio was approximately 3.8:1. However, while the construction of the charging network is steadily advancing, there is also a certain degree of structural supply shortage. The misallocation of resources has led to the coexistence of "charging difficulties" and a large number of idle public charging piles. In addition, for a long time, most of the public charging piles for electric vehicles on the market are fixed-power charging piles, and the design of charging piles is mostly designed to meet current car aaa battery alkaline standards. 40kW, 60kW, 80kW, 110kW... As newly launched models become more powerful, charging piles will need to be replaced or expanded.

　　The coexistence of electric vehicles with multiple powers has become a fait accompli in the electric vehicle stock market. Therefore, in centralized charging stations, how to improve the power compatibility of charging equipment is the key. "Under the same charging current, when the voltage is increased to 1,000V, if you still charge a car with a voltage platform of 350V, the power utilization rate of the existing technical solution is only less than one-third of the original, and the equipment utilization rate is extremely low. ." Xiao Xia, chairman of Shenzhen Aotexun Power Equipment Co., Ltd., said, "Charging pile technology can not only meet the current charging needs of batteries, but also meet the charging needs of future 'aaa battery alkaline upgrades', avoiding the repeated dismantling and construction of charging piles. ".

　　It is reported that the matrix flexible charging pile technology developed by Autoxun gathers all or part of the charging modules of electric vehicle charging stations together, and uses the power distribution unit to dynamically allocate charging modules according to the actual charging power required by electric vehicles. That is to say, in a charging station using charging pile technology, after power sharing, the same charging pile can satisfy both 100kW aaa battery alkaline charging and 300kW aaa battery alkaline charging, ensuring that each new energy vehicle can be charged at maximum power. In Shenzhen, Autoxun has invested, constructed and operated more than 80 flexible charging pile centralized charging stations.

　　Li Zhigang, chief engineer of Aotexun Electric Power Equipment, said that "sharing power" is a bit like "sharing bandwidth". "Before there were no charging piles, fixed-power charging equipment was like a fixed-bandwidth network. If the total bandwidth was 100 MB, there would be 10 Users, the bandwidth of each user is fixed at 10 Mbit/s, so even if many users do not use the broadband, the maximum bandwidth of other users is still 10 Mbit/s; and the charging pile is like a shared bandwidth, which can be dynamically adjusted according to the number of users and demand bandwidth. If If there is only one user, his broadband can reach up to 100Mbit."

　　Wei Jian, deputy general manager of Shenzhen Qianhai Aotexun New Energy Service Co., Ltd., said that how much power can be allocated to the charging terminal is determined by the electric vehicle being charged. AUTEXUN's technical team designed a huge computing system and established a cloud platform. After collecting big data on the identity information of hundreds of electric vehicles, intelligent management was carried out on the platform. When the charging gun is inserted into the charging port and "handshakes", all the vehicle information is read out and intelligently distributed to charge the vehicle.

　　Since December last year, the Shenzhen Standardization Guidance Technical Document - "Technical Requirements for Electric Vehicle Flexible Charging Stacks" jointly organized and formulated by the Shenzhen Municipal Market Supervision and Administration Bureau and the Shenzhen Municipal Development and Reform Commission has been implemented in Shenzhen. This is the first domestic document on Local standards for flexible charging stacks for electric vehicles. As a leading company in the power automation power supply segment industry, Shenzhen Aotexun Power Equipment Co., Ltd. is the lead drafting unit of this standard.

　　"For operating vehicles such as taxis and trucks, the power adaptability of centralized charging stations directly determines the convenience of charging." Ni Feng, deputy director of the International Department of Guodian Nari Technology Co., Ltd. said, "In centralized charging stations In various application scenarios, charging pile technology has the characteristics of accurate and efficient matching, and will undoubtedly be of great use."

　　Tapping the potential of high-power fast charging

　　It is generally believed that "fast charging" for electric vehicles refers to charging technology that takes less than 30 minutes to charge the aaa battery alkaline from 0% to 80%.

　　At the recently held electric vehicle high-power charging pilot seminar, CATL demonstrated to the participants the charging process of super iron lithium batteries using the "super iron lithium + high energy density fast charging graphite" system. This product can perform "5C" charging. The demonstration process completed charging from 20% to 80% in only 7 minutes and 12 seconds, and charging from 20% to 100% only took 13 minutes and 8 seconds.

　　Dr. Wang Lei, an energy storage technology expert and founder of Ecoflow, said, "Ultra-high-power charging uses high-voltage DC technology, which, figuratively speaking, means dumping electricity into the aaa battery alkaline." The unit "C" in "5C" refers to the charging rate, which can be understood as the charge and discharge rate. The charge and discharge rate of a lithium-ion aaa battery alkaline determines how quickly electrical energy can be stored in the aaa battery alkaline, or how quickly the energy in the aaa battery alkaline can be released. "1C" current takes 1/1=1 hour from full charge to discharge; "2C" means 1/2 hour, which is 30 minutes; 5C takes 12 minutes. It is generally believed that "fast charging" for electric vehicles refers to a charging method with a charging current greater than 1.6C, that is, a technology that charges from 0% to 80% in less than 30 minutes.

　　The core technology of lithium aaa battery alkaline fast charging is to accelerate the movement of lithium ions in the positive and negative electrodes through chemical system and design optimization without affecting the life and reliability of the aaa battery alkaline cells. Dr. Wang Shengwei, head of the fast charging project of CATL New Energy Co., Ltd., said that on the surface of the negative electrode graphite, CATL uses "fast ion ring" technology, which is equivalent to creating a high-speed track on the graphite surface, which greatly accelerates the transfer of lithium ions in the graphite. The embedded graphite layer has the characteristics of super fast charging and high energy density. In addition, the heat dissipation rate inside the aaa battery alkaline is also an important factor affecting the rate performance. If the heat dissipation rate is slow, the heat accumulated during high-rate charging and discharging cannot be transferred out, which will affect the reliability and life of the lithium-ion aaa battery alkaline. The fast charging products developed by CATL are equipped with a self-developed thermal management system that can fully identify the "healthy charging range" of fixed chemical systems in different environments and broaden the operating temperature range of lithium batteries.

　　"The demand for high-power charging is very clear. There is an urgent need for commercial vehicles, taxis, online ride-hailing and other vehicles both at home and abroad. Especially in large cities such as Beijing, Shanghai, Guangzhou and Shenzhen where parking spaces and charging pile resources are in short supply, it is difficult for car owners to When you find a parking space to charge, there will be a strong demand for high-power charging." Ni Feng said, "However, high-power fast charging products above 300kW are in their infancy globally, due to aaa battery alkaline heating, equipment size, safety isolation, etc. Technical issues still need to be optimized, and there is still a long way to go from technology maturity to market maturity; in addition, there are also infrastructure supporting issues such as charging station construction and power grid power supply that have yet to be resolved."

　　Management and services need to be more refined

　　Experts say that in order to promote the healthy development of electric vehicles, intelligent and refined management of charging services is the general trend.

　　my country has ranked first in the world's production and sales of new energy vehicles for three consecutive years. As of the end of last year, my country's cumulative sales of new energy vehicles reached 1.8 million units, accounting for more than 50% of global cumulative sales. "According to market trends, after 2020, there will be more and more high-power electric vehicles with a power of more than 300 to 400 kilowatts." Ni Feng believes that "whether it is the charging stack or the aaa battery alkaline itself, there are no technical problems." In addition, although early operators did not consider power expansion, in recent years, more and more operators have reserved expansion space in centralized charging stations. “After the demand for higher-power charging emerged, stations, piles, and piles have all It can be directly expanded - just add the corresponding modules."

　　Liu Yongdong, deputy director of the Standardization Management Center of the China Electricity Council, said that in terms of charging methods, the future trend of electric vehicles will be the long-term coexistence and combination of "daily slow charging at private AC charging piles" and "public fast charging". "For urban families who use electric vehicles to commute, using private charging piles at home to charge after get off work, long-term slow charging can already meet most needs; using fast charging at charging stations will be a necessary supplement." .

　　The optimization of the management system in the charging field is what many experts hope for. Ni Feng gave the example of the cooling solution for the power module of a charging station. The mainstream solutions for cooling power modules include water-cooling and air-cooling modes. The former has a long service life and high reliability, but is expensive; the latter is low-priced, but has high environmental requirements and is prone to dust blockage and other phenomena when used for a long time. "The 'lowest bidder gets it' mechanism in domestic bidding has led many operators to adopt the air-cooling model, but it needs to be completely replaced within two years of use. The overall cost of use is actually higher than using water cooling," Ni Feng said. .

　　In Liu Yongdong's view, there is still considerable room for development in the installation and management of private charging piles. "Many communities, especially old ones, cannot install it widely due to limited power distribution capacity and uncooperative property management. The use of technology platforms to promote and manage charging during low power consumption periods also needs to be further promoted." Intelligent and refined management of charging services is the general trend.

　　“What we are talking about today about the improvement of charging technology, management, and services is based on the healthy development of electric vehicles.” Ni Feng said, “The most fundamental driving force for electric vehicles still comes from the electric vehicles themselves and from the adjustment of the entire industry chain ecology. and changes. What we are most concerned about is still the strong desire of users to spontaneously consume and use electric vehicles after the relevant subsidies are cancelled. This is the key to the long-term development of the entire industry."

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