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Power batteries mainly include square batteries, cylindrical batteries, and soft pack batteries. Square aluminum shell power batteries have become the primary focus of domestic lithium manufacturing and development due to their simple structure, good impact resistance, high energy density, large single capacity, and many other advantages.
In the manufacturing process of a single battery, key components that need laser welding include a pole, adapter, sealing port, electrolyte injection port, injection hole sealing nails, connecting piece, explosion-proof valve, flip-flop, top cover sealing, and more.
Flexible pack batteries mainly consist of positive and negative lugs connected in series, positive and negative lugs welded with copper converging pieces, and multi-layer negative aluminum and copper converging piece welding. The thickness of copper lugs is generally 0.2-0.5mm, and aluminum lugs are generally 0.2-0.6mm. Single-mode fiber laser lens welding is commonly used.
Laser welding offers high energy density, minimal welding deformation, a small heat-affected zone, effective improvement of part precision, smooth and impurity-free weld seams, consistent density, and eliminates the need for additional grinding work. Laser welding allows for precise control, with a small focusing point of light, high-precision positioning, easy automation with robotic arms, improved welding efficiency, reduced man-hours, and cost savings. Laser welding of thin sheet metal or fine diameter wire is less susceptible to melting back compared to arc welding.
The advantage of the laser welding process is its ability to weld a wide range of materials and realize welding between different materials. In the power lithium-ion battery welding process, technicians select the appropriate laser and welding process parameters based on battery material, shape, thickness, tensile requirements, and more to establish reasonable welding process parameters. This ensures that the final welding effect meets the requirements of power lithium-ion battery manufacturers.
For square batteries, each battery needs to be connected in series and parallel to a battery module unit through positive and negative electrode poles. Battery pole materials include copper and aluminum, which are high-resistance materials requiring good laser beam quality and high energy density.
The adapter's role is to connect the top cover post of the square shell battery and the battery internal cell lugs, forming the current conduction. The current welding program selects a fiber laser with a wavelength of ~nm. The battery's negative pole adapter is made of copper, which has low absorption in this wavelength band and rapid heat dissipation. Therefore, high power density is needed for deep fusion welding.
In blue laser and fiber laser composite welding, the overall laser utilization rate is high. A lower total power can complete the adapter laser welding application, ensuring stability in the welding process. This reduces the likelihood of welding issues, eliminates spatter, and allows for adjustable weld width to significantly enhance the product performance of square shell batteries.
Power battery shell materials mainly include aluminum alloy and stainless steel, with aluminum alloy being the most commonly used. Stainless steel, such as 304 stainless steel, exhibits better laser welding performance. Whether using a pulsed laser or continuous laser, it can achieve better weld appearance and mechanical properties. The square battery shell thickness is generally below 1mm, depending on capacity, with 0.6mm and 0.8mm being common. Laser welding square power battery shells can be categorized as side welding and top welding.
The shape of the sealing nail (injection cap) is usually a round cap with a diameter of 8mm and a thickness of about 0.9mm. Traditional YAG pulsed lasers are commonly used for welding these sealing nails, producing well-shaped welds with good consistency and high yield. However, using fiber lasers for sealing nails through continuous light mode allows for significantly higher welding speeds'up to 80-120mm/s'compared to YAG laser welding. This represents a more than tenfold increase in welding speed.
To inject electrolyte into the battery case, a liquid injection hole is present in the top cover piece. After completing the liquid injection, the liquid injection hole is sealed, typically using a rubber nail for initial sealing. The final sealing nail is then assembled and laser-welded.
The power battery module connecting piece adopts a multi-layer material composite, with one layer serving as the connecting layer of the connecting piece and pole to ensure welding performance. The multi-layer material superposition ensures the electrical conductivity of the connecting piece. Power battery module connectors are generally rectangular, trapezoidal, triangular, and stage-shaped, with a 0.1mm thick nickel-plated copper foil on the connecting surface.
The primary function of the explosion-proof valve is to prevent the battery from exploding during thermal runaway, ensuring battery safety. The welding process for the explosion-proof valve is demanding. Explosion-proof valves can be welded with pulsed and continuous lasers. Continuous laser welding requires higher precision for product assembly but achieves higher-quality welding results, along with welding stability, efficiency, and yield rate guarantees. The explosion-proof valve is a pure aluminum (AL) round sheet with a thickness ranging between 0.08 and 0.1mm.
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Product Description
Product Description
1'Description:
Good quality lithium battery top cover laser welding machine has high equipment utilization rate which can weld a variety of products;
High positioning accuracy, simple operation, CNC programming or teaching method, easy to understand;
Easy to replace, modular design, quick fixture replacement.
2'Technical parameter
Item Specifications Model HY-w Laser source w Name Good quality lithium battery top cover laser welding machine XYZ Travel Customizable R Axis Optional, 360° rotation Position Accuracy ±0.02mm Repeatability Accuracy ±0.01mm Motion Source Servo motor Max Speed 500mm/s Cooling Method Water cooling Electricity Demand Customizable Laser Wavelength nm Observation Syatem CCD system Gas Protection Optional, Argon, Nitrogen Environmental Requirements No vibration, interference and ventilation Welding Penetration 0.1~3.0mm MOQ 1 set
3'Main parts:
Good quality lithium battery top cover laser welding machine has high-precision galvanometer welding system which can effectively ensure the accuracy of welding
Enclose the workbench to ensure welding quality
Contact us to discuss your requirements of Lithium Battery Top Cover Laser Welding supplier. Our experienced sales team can help you identify the options that best suit your needs.
Welding fixtures are customized according to customer drawings, with high precision
CCD monitoring system, real-time monitoring, accurate positioning
4'Application:
1. Welding of battery explosion-proof valve
Good quality lithium battery top cover laser welding machine ,The explosion-proof valve of the battery is a thin-walled valve body on the battery sealing plate. When the internal pressure of the battery exceeds the specified value, the valve body of the explosion-proof valve ruptures to prevent the battery from bursting. The safety valve has an ingenious structure, and this process requires extremely strict laser welding technology. Continuous laser welding can achieve high-speed and high-quality welding, and welding stability, welding efficiency and yield can be guaranteed.
2. Welding of battery tabs
Good quality lithium battery top cover laser welding machine ,The tabs are usually divided into three materials. The positive electrode of the battery uses aluminum material, and the negative electrode uses nickel material or copper nickel-plated material. In the manufacturing process of power batteries, one of the steps is to weld the battery tabs and poles together. In the production of the secondary battery, it needs to be welded with another aluminum safety valve. Welding must not only ensure the reliable connection between the tab and the pole, but also requires a smooth and beautiful weld.
3. Spot welding of battery poles
Good quality lithium battery top cover laser welding machine ,The materials used for the battery poles include pure aluminum tape, nickel tape, aluminum-nickel composite tape, and a small amount of copper tape. The welding of battery electrode strips generally uses pulse welding machines. Due to its good beam quality and small welding spot, QCW quasi-continuous lasers are suitable for high reflectivity aluminum strips, copper strips and narrow-band battery strips (polar strip width (Under 1.5mm) welding has unique advantages.
4. The power battery shell and the cover plate are sealed and welded
Good quality lithium battery top cover laser welding machine ,The shell materials of the power battery are aluminum alloy and stainless steel (stainless and acid-resistant steel). Among them, aluminum alloy is mostly used, generally aluminum alloy, and a few use pure aluminum. Stainless steel is a laser weldable material, especially 304 stainless steel, whether it is pulsed or continuous laser, it can obtain welds with good appearance and performance.
5. Power battery module and pack welding
Good quality lithium battery top cover laser welding machine ,The series and parallel connections between power batteries are generally completed by welding the connecting piece and the single battery. The positive and negative electrodes are made of different materials. Generally, there are two kinds of materials: copper and aluminum. Ultrasonic welding is usually used. Copper and copper, aluminum and aluminum are generally used. Using laser welding. Both copper and aluminum conduct heat very quickly and have a very high reflectivity to the laser. The relatively large thickness of the connecting piece requires a higher power laser welding.
5'Application Areas:
Lithium battery industry
3C Electronics Industry
Hardware industry
Aerospace industry Automobile industryMedical device industry
Energy, lighting,
building materials industry
Jewelry industry PCB industry
6'Samples
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