With the rapid development of new energy technology, lithium battery, fuel cell and other related products technology has attracted much attention, and the same as the energy storage device of supercapacitors may not be known by the public. Because of its short charging time, long service life, good temperature characteristics, energy saving and green environmental protection, super capacitor has been widely recognized by the industry, and the industry has grown rapidly. It is widely used in public transportation, power grid, and many industrial applications. As long as the moving object, the supercapacitor can capture its energy and reuse it.
Supercapacitor is a double layer structure consisting of activated carbon, porous electrode and electrolyte. Different from the chemical reaction battery, the charging and discharging process of the supercapacitor is always a physical process, and the performance is very stable, so the safety factor is high, the low-temperature performance is good, the service life is long and the maintenance is free.
The core component of supercapacitor is electrode, and the manufacturing process of electrode is divided into two kinds: dry electrode and wet electrode. Dry electrode technology is an electrode made by dry mixed active carbon powder and binder. In addition to active carbon powder and binder, liquid solvent is added to the electrode during wet electrode fabrication. Since liquid solvents can affect the performance of supercapacitors, it is necessary to use the oven to dry them and remove the solvents from the electrodes. This means that wet electrode technology works longer and has additional production costs compared to dry electrode technology. In addition, the drying process is difficult to completely remove the solvent. In the process of supercapacitor operation, solvent impurities will react to produce additional substances, affecting the electrode and electrolyte performance. The gas generated by the reaction will accelerate the aging of the supercapacitor. Therefore, the supercapacitor with wet electrode technology has relatively short service life, low reliability and poor stability.
The specific comparison between dry electrode process and wet electrode process is listed in the following table:
Dry electrode technology also has its own advantages in production cost. Super capacitor manufacturers industry-leading Maxwell said they from coconut shell, apricot shell, wheat and other materials to extract the core material of super capacitor in the carbon, the application of these new materials is also a way to reduce the cost of. Maxwell also has the majority of patented technology focused on electrode research and development, manufacturing and manufacturing. More than 35 patented technologies and proprietary dry electrode technology have produced excellent performance advantages of supercapacitors. With this process, a capacitor monomer with the lowest total cost can be produced. As a result of the use of solvent free high purity materials, this way is also more green environmental protection and energy saving, and can achieve one hundred percent recycling.
Maxwell supercapacitor patent dry electrode process flow
In China, the most extensive application of super capacitor is the braking energy recovery system of urban hybrid bus. According to statistics, quantity of the current Maxwell in the China hypervolumic hybrid bus has more than ten thousand vehicles, Yutong, dragon, golden dragon, Hagrid, CSR and other more than 10 well-known car prices has been successfully applied to the super capacity of new energy vehicles, energy saving, fuel-efficient environmental protection effect with zhuo. To actively promote the role that development of Maxwell super capacitor of Xingrong China hybrid bus markets.
In June this year, Maxwell Technology launched the 2.85V/3400F super capacitor monomer, set up a new energy, power and durability standards for the industry. Considering the difference of the domestic bus running road condition, Maxwell company has also improved the performance of the super capacitor module to improve the seismic performance. The anti shock and vibration technology at the same time the launch of DuraBlue, with the most demanding requirements of the traffic environment, compared with the super capacitor competing products based on the anti vibration and anti shock performance were increased nearly 3 times and 4 times.
Because the raw material is activated carbon, no heavy metal, the safety performance of super capacitor is also unquestionable. After a comprehensive test, in the normal range of application, the electrolyte itself does not occur explosion, fire and other safety issues. Taking Maxwell supercapacitor as an example, most of the electrolyte is infiltrated into the carbon electrode, and the flowing part is very small, and the sealing is good. In addition, the super capacitor system also has corresponding electrical protection in the design, if the fault occurs, then the protection system will isolate the fault components, to ensure the safety of the system.
Original title: disclose the core technology of Maxwell super capacitor
