Battery and super capacitor have their own advantages and disadvantages. In order to combine the advantages of both, engineers try to create a mixture of the two - "super battery". The first task of engineers is to occupy the high energy density, because once this problem is solved, super batteries can replace the use of high cost, high-power super capacitors in the transportation of occupations and natural power collection. In March 2013, researchers at the University of California, Los Angeles announced the creation of a graphene based micro supercapacitor, which Farad capacitor It is made of a carbon layer only one atom thick, and its charging and discharging speed is 100 times or even 1000 times faster than that of standard batteries. Make this Super capacitor module It does not need sophisticated equipment and instruments. A general DVD recorder can complete the entire production process. The research team showed that using this technology, they used cheap materials to produce more than 100 micro super batteries on a CD, which only took less than half an hour.
In the car industry, the application of intelligent start stop control system (light hybrid system) provides a broad stage for supercapacitors, especially in plug-in hybrid cars. Due to the frequent starting and stopping of electric cars, the discharge process of the battery changes greatly. During normal driving, the average power drawn by the electric car from the battery is quite low, and the peak value during acceleration and climbing is quite high.
Super capacitor manufacturer Under the existing battery technology conditions of electric cars, the battery must make a balance between specific energy and specific power, as well as specific power and cycle life. It is difficult to pursue high specific energy, high specific power and longevity on a set of power systems at the same time.
In order to deal with the contradiction between the driving range of the electric car and the acceleration of climbing performance, two sets of power systems can be considered, in which the driving range is improved by the main power, while the auxiliary power provides short-term auxiliary power when accelerating and climbing. The energy of the auxiliary power system can be directly derived from the independent power, and can also recover the renewable kinetic energy when the electric car brakes or goes downhill. Super capacitors are used as auxiliary energy.
In the short term, the extremely low specific energy of the supercapacitor makes it impossible to be used solely as the power system of electric cars, but it has obvious advantages as an auxiliary energy source. The combination used in electric cars is the battery farad capacitor hybrid energy system, which requires separate specific energy and specific power of the battery.
The super capacitor has the effect of load balancing, and the discharge current of the battery reduces the available energy and service life of the battery; Compared with batteries, super capacitors can quickly and efficiently absorb the regenerative kinetic energy generated by braking of electric cars. The early balance and energy recovery effect of the super capacitor make great progress in the driving range of the vehicle. However, the system should comprehensively control and optimize the matching of batteries, supercapacitors, motors and power inverters. The design and application of power converters and their controllers should fully consider the matching between motors and supercapacitors.
