In the production process of battery modules, welding is a crucial process, which directly affects the cost, quality, safety performance and consistency of the battery. With the advancement of science and technology, laser welding, as an advanced new welding method, has been widely used in the manufacture of battery modules. This article will elaborate on the working principle and advantages of laser welding in battery modules.
1. The basic principle of laser welding
Laser welding is to focus the laser beam on a very small workpiece area through an optical system, and use its excellent directionality and high power density to process. In a very short time, the laser beam forms a heat source area with highly concentrated energy on the workpiece, so that the workpiece melts and forms a firm welding point and weld to complete the welding task. Laser welding is mainly divided into several forms such as heat conduction welding, deep fusion welding, penetration welding and seam welding, each of which has its specific application scenarios and advantages.
2. Application of laser welding in battery modules
In the production of battery modules, laser welding is mainly used in the packaging of battery cells, welding of pole ears and assembly of battery packs (PACK). These links have extremely high requirements for welding accuracy, stability and reliability, and laser welding can just meet these requirements.
Cell packaging:
Cell packaging is one of the key steps in battery module manufacturing. Laser welding can achieve precise welding of cell shells and cover plates by precisely controlling the focus and energy density of the laser beam. This welding method not only has smooth welds without impurities, but also has small welding deformation and small heat-affected zone, thus ensuring the sealing and safety of the cell.
Tab welding:
The tab is a key component for connecting the battery cell to the external circuit. Laser welding can achieve high-speed and high-precision welding of the tab, while avoiding the spatter generated during the welding process from contaminating the inside of the cell. In addition, laser welding can also achieve welding of complex trajectories such as S-shaped and spiral shapes, thereby increasing the weld joint area and strengthening the welding strength.
Battery pack (PACK) assembly:
During the assembly process of the battery pack (PACK), laser welding is widely used for the connection between cells and the connection between cells and components such as protection circuits and shells. The high precision and stability of laser welding ensure the firmness and reliability of the internal structure of the battery pack, thereby improving the overall performance and service life of the battery pack.
3. Advantages of laser welding
High precision: Laser welding can achieve precise welding of tiny areas, and the width and depth of the weld are highly controllable, thus ensuring the accuracy and consistency of welding.
High efficiency: Laser welding has a fast speed and a small heat-affected zone, which can significantly improve production efficiency and reduce production costs.
High quality: The laser welding weld is smooth, free of impurities, uniform and dense, and no additional grinding is required, thus ensuring the welding quality.
Wide applicability: Laser welding can weld a variety of materials, including steel, aluminum, copper, nickel, etc., thus meeting the welding needs between different materials in the battery module.
High degree of automation: Laser welding is easy to integrate with automated equipment such as robotic arms to achieve automated production, improving production efficiency and stability.
4. Conclusion
In summary, laser welding plays an important role in battery module manufacturing. Its high precision, high efficiency, high quality and wide applicability make laser welding an indispensable process in battery module manufacturing. With the continuous development and progress of science and technology, laser welding technology will be more widely used and promoted in the field of battery module manufacturing.
Huiyao Laser Technology (Luoyang) Co., Ltd. is a high-tech enterprise focusing on the research and development, manufacturing and sales of equipment for the new energy industry. Relying on the support of scientific research institutions such as the Luoyang Research Institute of Dalian University of Technology, the company has built a highly skilled R&D team, committed to providing customers with comprehensive laser welding equipment, battery assembly line equipment, module PACK automatic line equipment, battery structure automation equipment and other high-end intelligent equipment.
The company covers an area of more than 10,000 square meters, has multiple automated production lines and advanced processing equipment, and has IS09001 quality management system certification and ISO14001 environmental management system certification. The company actively promotes standardized production models, improves product quality management and after-sales service guarantees, and is committed to providing customers with reliable products and high-quality services.
