The latest research on cylindrical lithium-ion batteries
This paper studies and solves the key technical problems of cylindrical power lithium-ion battery in the aspects of positive and negative electrode material matching, process formula optimization and internal structure design of the battery, which opens up for the research of large-capacity, high-safety, and long-life new power battery A new way.

　　 It is reported that the maximum capacity of cylindrical single-cell lithium-ion batteries that have been reported in the world is 50Ah. The capacity of this cylindrical single-cell 400Ah battery developed in China can be called the world’s “big Mac”. According to Tang Zhiyuan, the person in charge of the project and a professor at Tianjin University, many small-capacity lithium-ion batteries are commonly used in the field of electric vehicles to provide power through series and parallel connections. For example, driving a 12-meter-long 33-seater electric bus requires at least thousands of 10Ah. Small batteries are combined in series and parallel. This method will make the battery management system (BMS) and the control system too complicated, thereby increasing the battery safety hazards and other issues. Using this "Big Mac" battery just broke through this "bottleneck", only about 200 batteries are enough. It greatly reduces the difficulty of achieving equilibrium in the control process, and improves the safety and economy of the car. According to reports, for the positive and negative electrode materials, this battery is the first to combine the application of lithium iron phosphate and lithium titanate electrode materials with good thermal stability and structural stability, thereby improving the safety performance of the battery and avoiding overcharge and high temperature. , Short circuit, impact and cause explosion. Its stainless steel "coat" has the characteristics of fast heat conduction, strong heat dissipation, pressure resistance and impact resistance. In terms of service life, the expected number of cycles of this battery is more than 8,000, which is 2 to 4 times the service life of a general lithium battery. At present, this "Big Mac" battery has been put into small batch production and will be officially put into production next year in Longqi Bay, a national economic and technological development zone in Jinzhou, province.　　 A 400Ah lithium-ion battery with a large capacity cylindrical monomer was recently jointly developed by Tianjin University and Beijing Tianlu Energy Co., Ltd. Today, the Tianjin Science and Technology Evaluation Center organized relevant experts to appraise this achievement at Tianjin University. The academicians and related experts who attended the appraisal meeting believed that this achievement systematically studied and solved the key technical problems of cylindrical power lithium-ion battery in terms of positive and negative electrode material matching, process formula optimization and battery internal structure design. The research on new power batteries with high capacity, high safety and long life has opened up a new way. After searching, it is confirmed that this achievement has the international advanced level.　　 It is reported that the maximum capacity of cylindrical single-cell lithium-ion batteries that have been reported in the world is 50Ah. The capacity of this cylindrical single-cell 400Ah battery developed in China can be called the world’s “big Mac”. According to Tang Zhiyuan, the person in charge of the project and a professor at Tianjin University, many small-capacity lithium-ion batteries are commonly used in the field of electric vehicles to provide power through series and parallel connections. For example, driving a 12-meter-long 33-seater electric bus requires at least thousands of 10Ah. Small batteries are combined in series and parallel. This method will make the battery management system (BMS) and the control system too complicated, thereby increasing the battery safety hazards and other issues. Using this "Big Mac" battery just broke through this "bottleneck", only about 200 batteries are enough. It greatly reduces the difficulty of achieving equilibrium in the control process, and improves the safety and economy of the car. According to reports, for the positive and negative electrode materials, this battery is the first to combine the application of lithium iron phosphate and lithium titanate electrode materials with good thermal stability and structural stability, thereby improving the safety performance of the battery and avoiding overcharge and high temperature. , Short circuit, impact and cause explosion. Its stainless steel "coat" has the characteristics of fast heat conduction, strong heat dissipation, pressure resistance and impact resistance. In terms of service life, the expected number of cycles of this battery is more than 8,000, which is 2 to 4 times the service life of a general lithium battery. At present, this "Big Mac" battery has been put into small batch production and will be officially put into production next year in Longqi Bay, a national economic and technological development zone in Jinzhou, province.