Development of Lithium Battery Welding Technology with Linear Motor Platform
time£º2017/10/18 click£º5505
In the past two years, with the support of the government and local policies, our country's new energy vehicles have been developed well. The development of new energy vehicles has driven the rapid growth of enterprises in the upper and lower reaches of the industrial chain, especially the lithium battery industry. At present, most of the advanced laser welding technology is used to weld the core of the lithium battery and the protective plate. With the continuous development of the manufacturing industry, how to improve the welding level of lithium batteries and design and optimize the overall performance of equipment, has received the attention and research of lithium battery manufacturers. The traditional lithium battery welding mechanism usually uses ball screw. Now the linear motor has gradually received the attention and application of various manufacturers. The linear motor has better dynamic performance, more precise positioning accuracy and repeated positioning accuracy than the ball screw. Higher stability, Lower maintenance costs. It has become a trend to replace the ball screw platform with a linear motor transmission platform.
The lithium battery module can greatly reduce the contact resistance, reduce energy consumption and improve the reliability and service life of the battery through precision laser welding. However, laser welding requires high assembly precision, and requires that the position of laser beam on the workpiece can not be significantly offset. If the welding assembly precision and laser beam positioning precision do not meet the requirements, it is easy to cause welding defects and affect the welding quality.
Laser welding has the following characteristics: laser power density is high, and it can weld high melting point, refractory metal or two kinds of materials; The focusing spot is small, the heating speed is fast, the action time is short, the thermal influence area is small, and the thermal deformation is negligible. Laser welding belongs to non-metal welding, no mechanical stress and mechanical deformation; Laser welding device is easy to computer online, can accurately locate, achieve automatic welding. The characteristics of laser welding technology and the structural properties of lithium batteries have put forward higher and more precise requirements for the moving platform of laser welding equipment.
A linear motor is a transmission that converts electrical energy directly into linear motion mechanical energy without the need for any intermediate conversion mechanism. It can be seen as a rotating motor that is opened in a radial direction and developed into a plane. Linear motors can replace all mechanical drive parts such as ball bars, rack and gear, belt and pulley, and Gearbox, thus eliminating tooth gaps and problems related to mechanical transmission. It has the advantages of simple structure, wide speed range, good dynamic performance, high positioning accuracy, low running noise, no wear, no maintenance, and extended trip.
The Tongmao linear motor platform is driven by an imported non-core linear motor and the platform stroke ranges from 100 to 600mm. The platform has a good design, rigorous shaft assembly process, high performance, but low cost, this linear motor platform can be widely applied to industrial applications that require cost-effective and sophisticated solutions. Such as semiconductor wafer detection, Microelectronics component testing, extraction, DNA sequencing, laser processing and other fields.
An open incremental grating system with a very good linear performance integrated with a linear motor platform can provide sub-nanometer resolution, repeatability, and stability. Stable optical zeros ensure the repeatability and reliability of bidirectional zeros. By calibration compensation of laser interferometer, ideal positioning accuracy can be obtained easily. Easy to implement your high precision positioning requirements.
The Tongmao linear platform can meet the requirements of laser welding of lithium battery for the performance of the platform such as accuracy, acceleration and speed. For more information on Tongmao Linear Platform, please visit Kunshan Tongmao Official Website: www.tmemotion.com
Linear motor