The development history of 18650 lithium battery 3000mah

　　Since the 20th century, carbon emission issues have become the focus of world environmental protection. The automobile-dominated transportation and tourism manufacturing industries have first put energy conservation and consumption reduction on the agenda, and the development of new energy vehicles has begun to accelerate. In early 2017, European countries began to propose strict “burn ban” strategies, providing a new catalyst for the new energy vehicle market. Therefore, in the long run, the development trend of new energy vehicles is beyond doubt. However, the difference between fuel vehicles and new energy vehicles is that the driving force comes from different methods. The battery power supply system is the most important as the key position of different types of battery vehicles, accounting for about 30% of the entire new energy vehicle cost structure - 50%.

　　Why does the new energy electric vehicle sales market choose lithium batteries?

　　Lithium batteries are the key choice for most new energy vehicles on the market. Compared with other traditional rechargeable batteries, lithium batteries have the following advantages:

　　1. High operating voltage: The current rated current of commercial lithium ions is generally around 3.6 volts, which is equivalent to three times the standard operating voltage of traditional rechargeable batteries such as nickel and hydrogen.

　　2. Specific energy: The mass specific volume and volume specific volume are large, among which the volume specific volume and mass specific volume of ur18650 can exceed 620whl-1 and 250whkg-1 respectively.

　　3. Long service life: Using lithium-containing chemicals in the film layer as the battery cathode material, the production of strong two-stage slip and placement, the structure of the lithium battery material is also less harmful, allowing the rechargeable battery charging frequency to reach 1000 More than times, it has a good service life.

　　4. Low self-discharge rate: Lithium-ion batteries can produce an electronic film on the raw material page during the first short battery charge, reducing the self-discharge rate of lithium-ion batteries, with a monthly charge-discharge rate of 10%.

　　5. Green and environmentally friendly: The cathode materials of rechargeable batteries are usually produced from raw materials with less toxicity, side effects, and less air pollution;

　　6. No memory: Rechargeable battery can be charged multiple times.

　　7. Wide range of operating temperatures: Currently lithium-ion batteries can operate within 20~45°C, and new scientific research is expected to further expand the operating temperature.

　　What components does a lithium battery consist of?

　　Lithium batteries generally consist of five parts: positive electrode, separator, electrolyte, negative electrode and battery casing.

　　Positive electrode: The charge-discharge specific volume of the rechargeable battery is determined by the battery positive electrode material. The battery positive electrode material generally includes lithium iron phosphate, lithium cobalt oxide, lithium nickel manganate, lithium iron phosphate or lithium nickel cobalt manganate ternary material. The positive electrode material of the battery is coated on a 10-20 μm current collector, and the material is aluminum foil.

　　Negative electrode: It is the low end difference of battery potential. The battery positive electrode material is currently the key high-purity graphite, nitrogen compound, carbon-based material, and tin-based material. The positive electrode material of the battery is coated on a 7-15 meter thick concentrated liquid, and the material is copper.

　　Separator: The separator is one of the key components of lithium batteries, avoiding two-level contact and short-circuit failure, and allowing electrolyte positive ions to cross between the two sides. At this stage, raw materials include microplates, polypropylene, high-pressure polyethylene or two composite materials.

　　Lithium battery electrolyte: The electrolyte of lithium battery is the material used to transport lithium-ion batteries in rechargeable batteries. The liquid electrolyte is mainly composed of organic chemical lithium battery electrolyte and electrolyte lithium salt.

　　Shell: generally steel shell and aluminum shell.

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