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Application of power battery welding machines in the field of lithium batteries

2022-12-19

　　As a core component of new energy vehicles, the quality of power batteries directly determines the performance of the car. Lithium battery manufacturing equipment generally includes front-end equipment, mid-end equipment, and back-end equipment, and the precision and automation level of these devices will directly affect the production efficiency and consistency of the products. Laser processing technology, as an alternative to traditional welding technology, has been widely used in lithium battery manufacturing equipment.Power Battery Welding MachineBased on the application in the industry, this elaborates on the process characteristics of laser welding in the lithium battery field and lists various process characteristics and development trends of the equipment.

　　From the manufacturing of lithium battery cells to the power battery welding machine, welding is a very important manufacturing process. The conductivity, strength, airtightness, metal fatigue resistance, and corrosion resistance of lithium batteries are typical evaluation criteria for the quality of battery welding. The choice of welding method and welding process will directly affect the cost, quality, safety, and consistency of the battery. Now, let's take a look at the various applications of laser welding in the lithium battery field.

　　1. Welding of Battery Explosion-proof Valves

　　The battery explosion-proof valve is a thin-walled valve body on the battery sealing plate. When the internal pressure of the battery exceeds the specified value, the explosion-proof valve body ruptures to prevent the battery from exploding. The structure of the safety valve is ingenious, and this process requires extremely strict laser welding technology. Before the use of continuous laser welding, the welding of battery explosion-proof valves was done using pulsed laser welding, achieving continuous sealed welding through overlapping weld points, but the welding efficiency was low and the sealing performance was relatively poor. Continuous laser welding can achieve high-speed, high-quality welding, ensuring welding stability, welding efficiency, and yield.

　　2. Welding of Battery Tabs

　　Tabs are usually made of three types of materials. The positive electrode of the battery is made of aluminum (Al), while the negative electrode is made of nickel (Ni) or nickel-copper (Ni-Cu). One of the steps in the manufacturing process of power batteries is to weld the battery tabs to the terminals. When manufacturing secondary batteries, it is necessary to weld them to another aluminum safety valve. The welding must not only ensure a reliable connection between the tabs and the terminals but also require the weld seam to be smooth and aesthetically pleasing.

　　3. Spot Welding of Battery Straps

　　The materials used for battery straps include pure aluminum strips, nickel strips, aluminum-nickel composite strips, and a small amount of copper strips. Generally, pulsed welding machines are used to weld battery electrodes. With the emergence of continuous lasers, they have been widely used for welding battery electrodes. At the same time, due to their good beam quality and small weld points, they have unique advantages in welding high-reflectivity aluminum strips, copper strips, and narrow battery electrodes (with a width of less than 1.5mm).

About Us

Shenzhen SHINHOP Laser Equipment Co., Ltd. It is a scientific and technological enterprise specializing in the research and development, production and sales of industrial laser processing equipment. It has been deeply engaged in the new energy industry for 20 years, focusing on the non-standard customization of automatic lithium battery cell assembly line and module PACK production line. It has successively obtained the national high-tech and specialized new enterprise certification.

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Company Address：Building 6, Jingneng Science and Technology Environmental Protection Industrial Park, No.3 Baolong 2nd Road, Longgang District, Shenzhen City, Guangdong Province

Customer service hotline:18898357350

Customer service E-mail:info@shinhop.com