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Prospect Of Energy Storage Battery Technology
- Jul 10, 2018 -

Key link of developing new energy - energy storage technology

Energy storage technology is closely linked with the development of new energy sources and the development of power grids. It can effectively improve the efficiency of energy utilization and solve the problems of power supply in remote areas. Therefore, energy storage technology is the key technology for solar energy and wind power generation to become the main energy source, and a key link in developing new energy sources. According to the insiders, the future of energy storage batteries should be in wind power and photovoltaic industry, especially in the wind power industry which has been widely distributed. Because of the instability of wind resources, the wind and photoelectricity industry has been developing rapidly in recent years, but it has been plagued by the grid. The application of energy storage technology can help the wind farm output smooth and "fill the valley with the peak."

At present, the mainstream energy storage technology includes two categories: physical energy storage and electrochemical energy storage. Physical energy storage includes pumped storage, compressed air, flywheel energy storage and superconducting energy storage, and open cycle gas turbines. Electrochemical energy storage includes sodium sulfur battery, vanadium battery, lithium battery, lead-acid battery and so on. With the characteristics of short construction period, low operating cost and no influence on the environment, the electrochemical energy storage technology has become the first choice for energy storage technology to solve new energy access.

In the global portable energy storage battery market, lithium-ion batteries occupy a large share of their energy density because of their absolute superiority.

Lithium ion battery is the most common electrochemical energy storage battery. Most of the batteries used in mobile phones and notebook computers are lithium ion batteries. The advantages of high energy efficiency and power capacity also extend the market of lithium-ion battery to the field of transportation. The development and promotion of small lithium batteries have been very successful. However, the large size of lithium batteries is difficult, facing the problems of high cost, high operating temperature and short circuit. Although substantial progress has been made in the development of lithium ion batteries, much work is needed to prolong the life of the battery, to improve the safety of the battery and to reduce the cost of the material.

In terms of the usage of lithium batteries, the electric vehicle industry should be much higher than the wind and photovoltaic industries, and this trend will remain for a long time.

Although the size of lithium battery is too large, it is very complex in energy control. However, the national grid is still inclined to lithium ion battery in the bidding of integrated scenery and storage project. In its tender notice, the scope of the tender referred to the lithium iron phosphate battery, and indicated that the procurement would be divided into two packages, 14 MW and 4 MW, respectively. The national network is also in favor of lithium ion batteries at the seventh Asian Wind Power Conference, when the national network showed a mobile charging storehouse that could charge 20 standard batteries at the same time, in which the battery is also a lithium iron phosphate battery.

It is understood that Japan, the United States and other developed countries have begun to study the electric vehicle as a distributed energy storage technology. There is such a design in the planned "EV model city" in Osaka, Japan.

Although the development of lithium ion batteries in the field of electric vehicles is generally promising, it still does not have the absolute competitive advantage in the large capacity storage market. The megawatt energy storage of lithium ion batteries is a very frontier research. In nearly 100 battery makers in the country, more than 10 large capacity batteries can be made, and the rest of the battery is parallel with small batteries. There are two technical routes for large capacity energy storage batteries, one is to develop large capacity batteries, and the mainstream technology in the world is sodium sulphur battery and liquid flow battery; the other is to make the battery parallel to large capacity, and the lithium ion battery technology is the main technology.

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