Because of its instantaneous high power, fast charge and discharge and long cycle life, supercapacitors are widely used in auxiliary peak-shaving power supply, standby power supply, renewable energy storage and alternative power supply, and have broad prospects in new energy vehicles, rail transit, industrial control, wind photovoltaic power generation and military industry. In terms of market scale, transportation, industry and new energy account for 38%, 30% and 2 1% respectively, and transportation is still the largest application field.

Supercapacitor, also known as electrochemical capacitor, electric double layer capacitor, gold capacitor and Farah capacitor, is an electrochemical element developed in 1970s and 1980s to store energy by polarizing electrolyte. Different from the traditional chemical power supply, it is a kind of power supply with special performance, which is between the traditional capacitor and battery. It mainly relies on electric double layer and redox pseudocapacitor charge to store electric energy.

In the consumer electronics market, supercapacitors are partially replacing traditional lithium batteries. Portable equipment, low-power electrical appliances, smart watches, etc. Most of them use smaller supercapacitors, and their applications are relatively mature. With the maturity of 5G technology, the number of Internet of Things connections in China is expected to increase rapidly. Supercapacitors can be used in smart four meters to provide power for clock chips and power failure protection.

NB-IoT, as a low-power wide-area cellular Internet of Things technology based on authorized frequency band, is suitable for indoor four-meter, underground pipe network and other applications, and is an important scene of smart cities.