China's new lithium battery will be industrialized in 2020

On the 17th, I learned from the 9th International Conference on New Lithium Battery for Electric Vehicles (ABAA9) that by 2020, China's new lithium-ion battery will be industrialized, and the power battery will be intelligently manufactured, and the product cost performance will be greatly improved.

According to Shuguang, deputy director of the High Technology Research and Development Center of the Ministry of Science and Technology, the current production of lithium-ion battery in the world is mainly concentrated in China, Japan, and South Korea, among which Chinese companies have the largest number and the largest production capacity.

"At present, China has formed a relatively complete lithium-ion battery industry chain system, mastering the formulation design, structural design and manufacturing process technology of power batteries, and the production line has gradually transitioned from semi-automatic to fully automated large-scale manufacturing." .

Dawning pointed out that China's lithium-ion battery companies still have a large gap with advanced foreign companies in high-end materials and related basic research, as well as battery safety, reliability and system management technology.

According to reports, during the "Twelfth Five-Year Plan" period, China's lithium-ion power battery has a specific energy of more than 160 watt-hours per kilogram, and the cost is less than 3 yuan / watt-hour. According to "Made in China 2025", by 2020, the specific energy of lithium-ion batteries in China will reach 300 watt-hours/kg.

As a power battery widely used in new energy vehicles, lithium battery technology has greatly affected the development of the new energy automobile industry.

"For a long time in the future, China Energy Conservation will focus on popularizing new energy vehicles such as plug-in hybrid vehicles and pure electric vehicles . Therefore, the next step is to improve the intelligent manufacturing level of power batteries and improve the verification test methods and standards system. It is a key task for the development of China's power battery," said Shuguang.

This standard replaces GB/T8162-2008 "structure with seamless steel tube". This standard is compared with GB/T8162-2008, the main change is as follows:

This standard is applicable to the general structure and mechanical structure of Seamless Steel Pipe, seamless Steel Pipe, fluid seamless steel pipe standard for the general seamless steel pipe. The main difference between it and the structure of seamless steel tube is the hydraulic test or the ultrasonic, eddy current and magnetic flux leakage testing. Therefore, it is not suitable to use fluid seamless steel pipe in the standard of pressure pipe. Seamless steel pipe for the outside diameter, wall thickness, thick walled seamless steel pipe is mainly used for mechanical processing, coal, hydraulic steel, and other purposes. Thick walled seamless steel pipe is divided into 10#, 20#, 35#, 16Mn, 45#, 12Cr1MoV, 27SiMn, 10CrMo910, 15CrMo, 35CrMo, etc.. The classification of thick walled seamless steel pipe hot rolled thick wall seamless steel pipe, cold rolled thick wall seamless steel pipe, seamless steel tube, cold drawn thick wall extrusion thick wall seamless steel tube, pipe jacking. Stainless steel seamless steel pipe structure (GB/T14975-1994) is widely used in chemical, petroleum, hot-rolled stainless steel made of textile, medical, food, machinery and other industrial anti-corrosion pipes and structural parts and parts of the (extrusion, expansion) and cold drawing (rolling) seamless steel tube.

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Application:
Scope of use, including the general structure and mechanical structure, a large number of construction, machinery, transportation, aviation, oil and other industries of various structures.

Delamination defect
In view of the mechanism, it is generally believed that the non metallic inclusions in the tube will destroy the continuity and compactness of the 45# structure, and the serious inclusion of the 45# structure will produce delamination. The other one is that the hydrogen induced crack, because of hydrogen in steel aggregation caused by internal gas metal pressure is too high, the formation of white spots in the compact inner tube, the crack occurred in the rolling process, and ultimately the formation of lamination defect. In addition, the uneven deformation of the two roll cross piercing is produced by the stress exceeding the plastic strength.
In the case of strict smelting control, there are third kinds of cases, the control measures:
1, improve the plastic and toughness of 45# steel pipe
Improving the cleanliness of molten steel, reduce harmful inclusions in continuous casting billet; increase the proportion of equiaxed grains, reduce the central segregation and central porosity; the cooling system is reasonable, avoid the slab internal crack; on line slab or billet by slow cooling process, reduce internal stress, in which the microstructure and mechanical properties of pipe billet and finished 45# steel structure meet the technical standard requirements.
2, reasonable control of heating temperature
The best heating temperature was selected by the determination of the thermoplastic curve. Tube billet heating should also pay attention to enough holding time, in order to reduce the deformation resistance and improve the ductility of 45# steel pipe.
3, reduce the roll speed
The roller speed is the key parameter of the perforation process. The roller speed is changed from low to high, and there is a critical roll speed which begins to appear. When the roller rotating speed is low, the tube blank is easy to form a hole cavity. When the roller speed is higher, the tube blank and the 45# structure steel tube are easy to form the delamination defect. In order to eliminate the pipe blank and 45# structure, the roller speed should be reduced to the critical roll speed, which is lower than that of the layer.
Structure tube weight calculation formula: [(outside diameter - wall thickness) * wall thickness of]*0.02466=kg/ meters (weight per meter)

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