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Super capacitor energy storage, as the name suggests, is the use of super capacitor storage technology. Between conventional capacitors and a new type of storage battery charging device is in a super capacitor (supercapacitor, ultracapacitor. Its structure and cell structure similar, mainly including two electrode, electrolyte and fluid and spacer.
There are many kinds of classification methods, such as the electrode materials, electrolyte type, energy storage mechanism and so on, it is generally classified according to energy storage mechanism. According to the energy storage mechanism, super capacitor can be divided into three categories: Of the capacitance of electric double layer device (eecom from capacitor EDLC), positive and negative electrodes are to electric double layer for main storage mechanism; The Faraday quasi capacitor, positive and negative electrodes are in a quasi electric capacity (pseudo-capacitor, also known as "pseudo capacitance") as the main storage mechanism; Hybrid super capacitor, the positive and negative electrodes respectively to electric double layer and pseudo capacitance as the main storage mechanism.
Compared with conventional capacitors, with super capacitor charging speed, large capacity, long life, wide working temperature range, etc.; while compared with battery. It has the advantages of high specific power, fast charging and discharging, environment friendly. However, due to its own structural characteristics, the super capacitor has its disadvantages and limitations. Such as the energy density with respect to the electrochemical cell is still low; Self discharge rate is much higher than that of the electrochemical cell; Low voltage; resistance is bigger, not suitable for AC circuit.
Super capacitor can be widely used in hybrid vehicles, renewable energy power generation, uninterrupted power supply and portable laser detectors and other military applications. In addition, the super capacitor is also widely used in fast charging and discharging of consumer electronics and long time continuous discharge of computer memory backup power supply, etc..
At present, the main development trend of super capacitor energy storage technology is to further improve the energy density and power density of the super capacitor. The key technologies of super capacitor energy storage include hybrid super capacitor technology, high performance electrode material technology, super capacitor packaging and modular technology, and the coupling technology of super capacitor and new energy.
The extensive application of large-scale energy storage technology in power system will be an inevitable trend in the development of smart grid in the future. The storage capacity of super capacitor is one of the main physical energy storage technologies for power grid scale storage. It has broad application prospects and good development prospects. Through the analysis, we can see the following trends:
The study of the super capacitor began in 1960s. Global patent applications have continued to rise in the 20 years since the middle of 1990s. Especially in recent years, the global super capacitor energy storage related patent applications show a surge in the number of. At present, the technology of super capacitor energy storage is still in a fast developing stage. In the next few years, the number of global super capacitor storage related patents will continue to maintain a rapid growth rate, the field of competition will be more intense.
Of the super capacitor can patent applications mainly in: 1. Super capacitor technology as a whole; Electrode technique (positive electrode, a negative electrode, polarizable electrode, electrode resistance and electrode materials (high specific surface area active material, composite material, activated carbon, carbon fiber, etc.); Non water electrolyte (organic polymer electrolyte; lithium ion super capacitor; fifthly, super capacitor is used (electrical energy storage, energy storage unit, power supply, super capacitor module).
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