“Solar conversion electricity is a clean energy never depleted, but the electricity of solar energy cannot be constant, and there is a need to operate in the energy storage device.”Chinese Academy of Engineering Yang Yusheng in 2018 China“Photovoltaic + energy storage”At the Technical Fusion Innovation Application Conference, it is pointed out that the energy storage battery is an indispensable component of the microgrid, and my country's existing energy storage technology is actually competent.
Safety is the weight of the energy storage
The current chemical storage battery can be efficient, flexible, and can be large, and the technological progress is relatively fast, but its shortcomings are obvious. Yang Yusheng put forward the technical evaluation elements of chemical energy storage batteries in the meeting, and he pointed out that only the requirements and norms of it can be unveiled and applied to the photovoltaic power station.
He divided the top ten performance of large-scale storage battery as three levels: the first important is high security; the second request is high conversion efficiency, long cycle life, low price, convenient use, this Product economic benefits are closely related; the third requirements are rich in resources, environmentally friendly, cold-resistant, high-proportional energy, high ratio power. Only those of these elements can promote technological progress, so that“Photovoltaic + energy storage”The cost is dropped.
Yang Yusheng said that safety is the first element of energy storage battery technology. Chemical storage capacity battery combustion, the phenomenon of fire will continue to bring great economic losses to the photovoltaic power plant, which seriously affects the development of today's chemical energy storage market.
“Absolutely safe batteries are not, all kinds of batteries may have a combustion, explosion accident.”Yang Yusheng pointed out that first, users should recognize that the battery pack fuel tank is a component of high-energy substances, and there is a risk of dangerous.
Second, it is necessary to treat the battery as the use of flammable, explosive articles, and high voltage devices. Finally, we must seriously study measures to reduce the probability of battery accidents, and the safety of various batteries is very different, and should be treated appropriately.
Lead carbon battery is used in energy storage power stations
“Economic efficiency is the second element of the energy storage battery. The direct economic benefits of power storage can be drawn from the formula calculation, the longer the life, the lower the cost, the higher the energy efficiency. The higher the economic benefit.”Yang Yusheng said that in the existing chemical storage capacity, the lead charcoal battery of safe, cheap, mature products is used in my country's large scale.“Photovoltaic + energy storage”Power station.
The lead charcoal battery has been used in a large number of energy storage power stations because of their long life. Compared to other types of batteries, the lead-carry-carbon battery has a safe, environmentally friendly, high than power, resource cycle utilization, long cycle life, and high energy conversion efficiency. Although it is not a lithium-ion battery than energy, the value of the waste battery can be compensated for the price of the battery itself at a certain extent.
Confused lithium-ion batteries, although high energy, high efficiency, high power, and the cycle life is relatively long, but its security cannot be ignored.
The electrolyte in the lithium-ion battery is formulated with flammable solvents, and the oxidant and reducing agent on the positive and negative electrodes are only about 20 microns thick diaphragms; when the battery pack is running (or parking), when a certain The battery has reached a certain temperature, the oxidant and the reducing agent are easy to generate a large amount of heat generated chemical reaction with the electrolyte.———Heat out of control.
The thermal out-control is very easy to cause a chain reaction. Once the large-scale energy storage occurs, the consequences will be unimaginable. Therefore, if it is used to apply lithium-ion battery energy, strict security technical measures and management systems must be taken.
“Photovoltaic + energy storage”Application new pattern
Nowadays, the distributed photovoltaic market is hot, and household photovoltaics occupies the half-Wanjiang Mountain in the photovoltaic market. In response to this status, Yang Yusheng said that it should vigorously develop small photovoltaic power generation. He pointed out, small“Photovoltaic + energy storage”Application system, the project does not have to focus on the northwest, but should be built next to the user, so you can avoid far-distance transmission lines and line losses in which wind power is built.—Photovoltaic—The energy storage microgrid can also be complementary to the large grid. In the residential area, in addition to using roof, it is also possible to use the wall development to develop the photovoltaic + energy storage system.
In addition, Yang Yusheng called for investment in the research of new water storage battery research. He pointed out that special development of an organic battery, a zinc manganese battery, etc., which may be helpful to formulate the correct“Photovoltaic + energy storage”Development route, get rid of now“Touching the stone over the river”Dilemma.
He suggests that“Photovoltaic + energy storage”The application should be stepped up to verify its economic benefits. As long as the relevant policies are reasonable, they can promote the role of benign development. In addition, there is not a prejudice for various technical routes, so that the people of each exhibition can make the market benign, and the flowers are released.
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