Wind and solar power generated by renewable energy sources must be as soon as possible after the election in the world to develop renewable energy sources today, the development and promotion of energy storage devices becomes more important.
In two sessions this year, the CPPCC National Committee members called for Hu Liqing, the new energy industry to increase energy storage technology development. He said wind power and photovoltaic power generation in areas such as the lack of large-capacity storage of chemical energy storage batteries and other technical support, solar water heater China's new energy industry has been seriously constrained. He also suggested the need to strengthen the national level, large-capacity storage of chemical energy storage batteries and other key technical support. This can solve the wind, solar power random fluctuation problems, the grid stable and reliable, but also with wind power, photovoltaic power system composed of off-grid green, as the key to building a smart grid technology.
Coincidentally, the CPPCC National Committee members, Vice-Chairman of Shanghai Federation of Industry also said Duan Qihua,solar collector the current wind power and other renewable energy configuration of the power plants and pumped storage power station is, there are many limitations. For the wind and other renewable energy sources equipped with a suitable large-capacity battery energy storage system is the wind power can not solve our current problems and network bottlenecks in the most effective way. He also suggested that we should actively introduce foreign advanced technology of sodium sulfur storage battery, so the one hand, renewable energy to meet domestic electricity demand with installed, on the other hand you can digest and absorb advanced technology and strive to achieve self-reliance.
Foreign energy storage technology has developed to what stage? This article will introduce readers to the U.S. Pacific Northwest National Laboratory, electrochemical energy storage system has recently made a comprehensive assessment of the results.
Pacific Northwest National Laboratory under the U.S. Department of Energy, chemical, energy and environmental fields internationally renowned research institutions. Researchers at the lab that the future will take and store renewable energy to the electric power transmission line of the battery must be reliable, durable and safe, and whether the price of the battery is determined by the user to accept the size of its market the key.
Pacific Northwest National Laboratory researchers compared and evaluated four kinds of electrochemical energy storage batteries, they are all vanadium redox flow batteries, sodium acid storage batteries, lithium ion batteries and lead carbon batteries. The researchers noted that more than 4 cells have the potential to be large-scale development, there is also their problem.
Vanadium redox flow battery.
Vanadium Redox Battery in different valence states of vanadium ions into each other to achieve electrical energy storage and release. Charge, through the vanadium redox flow battery charging, electrical energy into chemical energy stored in different valence states of vanadium ions; when the power plant can not meet the rated output power, the flow cell began to discharge the stored chemical energy into electricity.
According to the research, all vanadium redox flow battery charge and discharge performance, capable of high-power charging and discharging. This battery, located large degree of freedom, small footprint, can be well into the solar and wind energy in the residential or industrial sites.
Sodium sulfur storage battery.
Sodium sulfur storage battery is usually built on a tubular design, combined with elements such as sodium sulfur, sodium and sulfur would be by a chemical reaction energy stored up, when the grid needs more power when it will be chemical energy into electrical energy released.
One advantage of this battery is the unit mass or unit volume with high effective electric energy. Large amount of energy released in a short time, is for vehicles and other application tools can be a good option. The disadvantage is that the battery materials, high cost, another concern is the temperature when the battery is running high, the reliability has been questioned.
Pacific Northwest National Laboratory researchers said, by improving the shape of the battery can improve the energy efficiency of the battery and reduce battery run-time temperature.