'Photovoltaic + energy storage' opens a new application pattern-photovoltaic battery

by:Power Kingdom     2021-04-29
'Solar energy conversion is an inexhaustible clean energy, but the electricity generated by solar energy cannot be constant, and it must be supported by energy storage devices.' Yang Yusheng, academician of the Chinese Academy of Engineering, pointed out at the 2018 China 'Photovoltaic + Energy Storage' Technology Fusion Innovation Application Conference , Energy storage battery is an indispensable component of micro-grid, and my country's existing energy storage technology is actually capable of its responsibility. Safety is the top priority for energy storage. Existing chemical energy storage batteries have high energy efficiency, flexibility, large or small scale, and relatively rapid technological progress, but their shortcomings are obvious. At the meeting, Yang Yusheng put forward the technical evaluation elements of chemical energy storage batteries from multiple angles and angles. He pointed out that only by putting forward requirements and specifications for them can they be able to compete virtuously and be applied to photovoltaic power plants. He divided the ten major performance requirements of large-scale energy storage batteries into three levels: the first important is high safety; the second requirement is high conversion efficiency, long cycle life, low price, and convenient use. Product economic benefits are closely related; the third requirement is rich resources, environmental friendliness, resistance to cold and heat, high specific energy, and high specific power. Only by satisfying these elements can we promote technological progress and reduce the cost of 'photovoltaic + energy storage'. Yang Yusheng said that safety is the first element in the evaluation of energy storage battery technology. Chemical energy storage batteries continue to burn and catch fire, which will bring great economic losses to photovoltaic power stations and seriously affect the development of today's chemical energy storage market. 'There is no absolutely safe battery. All kinds of batteries may burn and explode.' Yang Yusheng pointed out that first, users must admit that the battery pack is a component containing high-energy substances, like a gasoline tank, and has a dangerous nature. . Second, the use of batteries should be treated the same as using flammable and explosive materials and high-voltage devices. Finally, we must carefully study measures to reduce the probability of battery accidents. The safety of various batteries varies greatly and should be treated appropriately. Lead-carbon batteries are widely used in energy storage power stations. 'Economic benefits are the second element of energy storage batteries. The direct economic benefits of electricity storage can be calculated according to the formula from a number of indexes such as initial investment, charge and discharge depth, and operating costs. The longer the service life is. , The lower the cost and the higher the energy efficiency of the battery, the higher the economic benefit.” Yang Yusheng said, among the existing chemical energy storage batteries, lead-carbon batteries with safe, cheap and mature products are widely used in China’s large-scale “photovoltaic + storage” battery. Energy' in the power station. Because of its long life, lead-carbon batteries are now widely used in energy storage power stations. Compared with other types of batteries, lead-carbon batteries have the characteristics of safety, environmental friendliness, higher specific power, recycling of resources, longer cycle life, and higher energy conversion efficiency. Although the specific energy is lower than that of lithium-ion batteries, and the cost is not low, the value of waste batteries is higher, which can compensate the price of the battery itself to a certain extent. In contrast, lithium-ion batteries have high energy, high efficiency, high power, and relatively long cycle life, but their safety cannot be ignored. The electrolyte in lithium-ion batteries is prepared with flammable solvents. The oxidizer and reducing agent on the positive and negative electrodes are separated by a layer of about 20 microns thick diaphragm; when the battery pack is running (or parked), when a certain When the battery reaches a certain temperature, both the oxidant and the reducing agent are prone to a large amount of heat-generating chemical reaction with the electrolyte-thermal runaway. Thermal runaway is very easy to cause a chain reaction, once it occurs in large-scale energy storage, the consequences will be unimaginable. Therefore, if lithium-ion batteries are used for energy storage, strict safety technical measures and management systems must be adopted. The new application pattern of 'photovoltaic + energy storage' is now booming in the distributed photovoltaic market, and household photovoltaics account for half of the photovoltaic market. In response to this situation, Yang Yusheng said that small photovoltaic power generation should be vigorously developed. He pointed out that for small-scale 'photovoltaic + energy storage' application systems, projects need not be concentrated in the northwest, but should be built next to users, so as to avoid long-distance transmission lines and line losses, and build wind power-photovoltaic-energy storage micro-systems in it. The power grid can also complement the large power grid. In residential areas, in addition to the use of roofs, walls can also be used to develop household photovoltaic + energy storage systems. In addition, Yang Yusheng called for increasing investment in research on new water-based energy storage batteries. He pointed out that the special development of organic batteries, zinc-manganese batteries and other large-scale water-based batteries for power storage may help formulate the correct 'photovoltaic + energy storage' development route and get rid of the current dilemma of 'crossing the river by feeling the stones'. He suggested that the 'photovoltaic + energy storage' application system should be stepped up to demonstrate its economic benefits. As long as the relevant policies are reasonable, can promote and not excessive, we can enter a virtuous development cycle. In addition, there should be no prejudice against various technical routes, so that each company can show its own strengths in order to make the market benign competition and flourish.
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