Uncovering the core technology of Maxwell supercapacitor
- 2016-09-08 16:12:48
With the rapid development of new energy technology, the technology of lithium battery, fuel cell and other related products has attracted much attention, and the supercapacitor, as a energy storage device, may not be well known to the public. Because of the characteristics of short charging time, long service life, good temperature characteristics, energy saving and green environmental protection, supercapacitors have been widely recognized by the industry, and the industry is growing rapidly. It is widely used for public transport, power grids, and numerous industrial applications. As long as moving objects, supercapacitors can capture energy and reuse them.
The super capacitor is a double-layer structure composed of activated carbon porous electrode and electrolyte, which achieves super capacitance. Unlike the battery using chemical reaction, the charging and discharging process of the supercapacitor is always a physical process, the performance is very stable, so the safety factor is high, the low temperature performance is good, the life is long and the maintenance is free.
The core component of ultracapacitor is electrode, and the manufacturing technology of electrode is divided into two technologies: dry electrode and wet electrode. Dry electrode technology is used to produce electrodes only through dry mixed activated carbon powder and binder. Wet electrode technology in the process of making electrodes, in addition to active carbon powder and adhesives also need to add liquid solvents. Due to the influence of liquid solvents on the performance of ultracapacitor, it is necessary to use oven to dry it and remove the solvent from the electrode. This means that compared with dry electrode technology, wet electrode technology has longer process and additional production cost. In addition, drying is difficult to remove the solvent thoroughly. During the operation of supercapacitors, solvent impurities will react to produce extra substances, which will affect the performance of electrodes and electrolytes. The gas generated by the reaction will accelerate the aging of supercapacitors. Therefore, the super capacitor with wet electrode technology has relatively short life, low reliability and poor stability.
The following table shows the specific comparison between dry electrode process and wet electrode process.
Dry electrode technology has unique advantages in terms of production cost. Maxwell, the industry's leading supercapacitor maker, says it's a core material in supercapacitors, carbon from coconut shells, almond shells, wheat and other materials, and the application of these new materials is also a way to reduce costs. Maxwell also has most of the patent technologies focused on the development, production and manufacture of electrodes, and more than 35 patent technologies and proprietary dry electrode processes have made its supercapacitor excellent performance advantages. This process can produce the capacitor with the lowest total cost. Because of the use of solvent free high purity materials, this method is also more green and energy saving, and can reach one hundred percent recycling and reuse.
Technological process of patent dry electrode for Maxwell supercapacitor
In China, the most widely used supercapacitor is the urban hybrid electric bus braking energy recovery system. According to statistics, the number of Maxwell hyper hybrid buses in China has more than ten thousand vehicles, Yutong, Jinlong, Jinlong, Hagrid, South car and other well-known domestic car enterprises have been successfully applied to the new energy vehicles, energy saving and emission reduction, and the efficiency of environmental protection and environmental protection. It can be said that Maxwell super capacitor has played a positive role in promoting the development of China's hybrid electric bus market.
In June this year, Maxwell Technology launched the 2.85V/3400F super capacitor monomer, and set up a brand new energy, power and durability standard for the industry. Considering the large difference in the state of the domestic bus driving road, Maxwell company also specially improves the seismic performance of the super capacitor module. The DuraBlue anti shock and vibration technology, which is introduced in the same period, meets the harshest traffic and transportation requirements. It can improve the anti vibration and impact resistance by nearly 3 times and 4 times as compared with the similar competitive products based on supercapacitors.
Because the raw materials are activated carbon and no heavy metals, the safety performance of supercapacitors is beyond doubt. After a comprehensive test, the normal application of the electrolyte itself will not cause explosion, fire and other safety problems. Taking Maxwell supercapacitor as an example, most of the electrolyte permeates into the carbon electrode, the flow part is very small, and its sealing ability is good. In addition, the supercapacitor system in the design of the corresponding electrical protection, if there is a failure, the protection system will isolate the fault components to ensure the safety of the system.
Original title: uncovering the core technology of Maxwell supercapacitor