How to choose electric vehicle battery
The emergence of the electric vehicle industry has led to the development of electric vehicle batteries, and the two complement each other. Electric vehicles need batteries, and batteries can only realize their value in electric vehicles. So which electric vehicle battery technology is stronger? Many electric vehicle owners will pay attention to battery problems. Today, the technical personnel of the power lithium battery shell will analyze with you:
1. Power lithium-ion battery
Lithium-ion batteries use light metal lithium. Although they do not contain harmful heavy metals such as mercury and lead, they are environmentally friendly and have little environmental pollution. But in fact, as the cathode material and electrolyte containing nickel, manganese and other metals, lithium-ion batteries in the United States are listed as a kind of batteries that contain flammable, leaching toxicity, corrosiveness, and reactivity. Due to the more complex recycling process and higher cost, the current recycling rate is not high, and the impact of used batteries on the environment is low.
2. Hydrogen fuel cell
Hydrogen fuel power cells are an efficient and clean energy source that not only emits very little water, but are also very clean, so there is no water pollution problem. At the same time, unlike the engine, the fuel power cell does not convert thermal energy into mechanical energy, but directly converts chemical energy into electrical energy and thermal energy, resulting in high energy conversion efficiency and low noise. Hydrogen fuel cell power generation does not require large and complex configurations, and the battery stack can be assembled modularly.
3. NiMH rechargeable battery
Since the cadmium in NiCd batteries is toxic, complicates disposal of waste batteries and pollutes the environment, it will gradually be replaced by NiMH rechargeable batteries (NI-MH) made of hydrogen storage alloys. In terms of battery power, the battery power of a NiMH rechargeable battery of the same size is about 1.5 to 2 times that of a NiCd battery, and there is no cadmium pollution. At present, NiMH rechargeable batteries have been widely used in small portable electronic devices such as mobile communications and notebook computers. NiMH batteries are composed of hydrogen ions and nickel ions. The battery capacity is more than 30% larger than that of nickel-cadmium batteries, lighter than nickel-cadmium batteries, with long service life and no pollution to the environment.
4. Supercapacitors
The low energy density of ultracapacitors is one of the bottlenecks of its application, which is only 1/20 of that of lithium-ion batteries, about 10wh/kg. Therefore, it cannot be used as an important power source for electric vehicles, but is mainly used as an auxiliary power source, and is mainly used for quick-start devices and braking energy recovery devices. The charge transfer of supercapacitors occurs on the surface of the electrode active material during the charge-discharge process, so the capacity fading at temperature is very small, while Li-ion batteries usually have a 70% capacity fading at low temperatures.
From the above analysis, we can see the advantages of electric vehicle battery technology. Although the recycling and reuse rate of lithium-ion batteries is not high, it is undeniable that lithium-ion batteries are the most widely used and mature technology in electric vehicles. In addition, researchers have been working on the recycling of lithium-ion batteries.
