At present, new energy vehicles have become an inevitable trend in the world, and national policies have given strong support. In addition, many countries have even set a timetable for the delisting of traditional fuel vehicles. It can be said that new energy vehicles in the future may completely replace traditional ones. Fuel vehicles. In new energy vehicles, the development of pure electric vehicles is the main direction.
In the electric vehicle, the three-electric system is the core, in which the core of the battery is the core. The battery plays a very important role as the power source and the power source of the whole vehicle. At present, the mainstream battery of the electric vehicle is a lithium battery, and its energy density. Moderate, manufacturing cost advantages are relatively mature. However, lithium batteries also have very fatal weaknesses, such as poor safety and fire risk. For example, charging is slow, the fastest takes several hours.
In addition, lithium-ion batteries have a high internal impedance. Since the electrolyte of lithium-ion batteries is an organic solvent, its conductivity is much lower than that of nickel-cadmium batteries and nickel-metal hydride batteries, so the internal impedance of lithium-ion batteries is about It is 11 times that of nickel-cadmium battery and nickel metal hydride battery. For example, 18mm, 50mm long single cell battery impedance is about 90Ω.
In addition, the operating voltage of a lithium battery varies greatly. For example, when the battery discharge reaches 80% of its rated capacity, the voltage change of the nickel-cadmium battery is small (about 20%), and the voltage of the lithium ion battery varies greatly (about 40). %). This is a serious disadvantage for battery-powered devices, but since the discharge voltage of a lithium-ion battery varies greatly, it is easy to detect the remaining battery capacity.
Graphene battery is a new energy battery developed by utilizing the rapid and extensive movement of lithium ions between the surface of the graphene and the electrode. Graphene is no longer a new concept. Many experts and scholars at home and abroad have carried out this for many years. Research. Although there are some exciting experimental phenomena and results, it is still in the theoretical exploration stage in the laboratory. Therefore, the graphene battery is not ready for mass production, so the lithium battery cannot be replaced temporarily.
The lithium battery market is getting bigger and bigger, and the future lithium battery repair market is bound to be a bigger market.
