With the rapid development of new energy vehicles and energy storage markets, the lithium-ion battery industry has ushered in rapid growth. Welding technology, as a key link in the production process of lithium-ion batteries, directly affects the performance and safety of batteries.
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Traditional welding methods have problems such as large heat-affected zone, easy oxidation, and unstable welding quality. Laser welding has become the first choice for custom lithium battery pack welding with its unique advantages.
This article will focus on the laser welding machine for lithium ion batteries, hoping to be helpful for purchasing laser welding lithium ion batteries.
Battery Tab Welding: Battery tabs are critical for conducting electrical current between cells. Laser welding ensures a reliable, high-strength connection between tabs and electrodes, preventing potential malfunctions or failures.
Enclosure Sealing: Battery enclosures need to be sealed to prevent exposure to moisture or air, which can degrade battery performance. Laser welding is ideal for sealing the aluminum or steel enclosures used in lithium-ion batteries due to its high precision and strong, clean welds.
Module and Pack Assembly: When multiple cells are assembled into a battery pack, laser welding ensures a secure electrical connection between cells. This improves the safety and performance of the entire battery pack.
Material
Welding requirements
Determine the precision requirements of welding. For welding that requires high precision, such as in the welding of micro batteries or electronic components, a laser welding machine with high resolution and high-precision positioning system should be selected.
Consider the strength requirements of welding. For lithium batteries that need to withstand large mechanical stress or are used in harsh environments, a laser welding machine that can provide high welding strength should be selected.
Evaluate the appearance requirements of welding. If there are high requirements for the appearance quality of welding, such as no pores, no cracks, smooth surface, etc., a laser welding machine with good welding quality control should be selected.
Laser power
Choose the appropriate laser power according to the material thickness and welding requirements of the lithium battery. The higher the power, the faster the welding speed, but it may also cause overheating and material deformation. For thinner materials and high-precision welding, a lower-power laser may be more suitable.
Consider the stability of the laser power. Stable laser power can ensure the consistency of welding quality.
Laser wavelength
Different laser wavelengths have different absorption characteristics for different materials. Common laser wavelengths are nm, nm, etc. For the welding of lithium batteries, wavelengths with higher absorption rates for metal materials are usually selected.
Consider the stability and reliability of the laser wavelength. Stable wavelengths can ensure the consistency of welding effects.
Welding speed
Determine the appropriate welding speed according to production needs. Too fast welding speed may lead to a decrease in welding quality, while too slow will affect production efficiency.
Consider the dynamic performance of the laser welding machine, that is, the ability to maintain stable welding quality at different welding speeds.
Focused spot size
The focused spot size determines the welding accuracy and the size of the heat-affected zone. Smaller spot sizes enable high-precision welding, but also require higher power and a more precise positioning system.
Choose the appropriate focused spot size based on the welding requirements. For welding of micro batteries or electronic components, a smaller spot size is usually required.
Equipment stability
Choose a laser welding machine with high stability and reliability to ensure long-term stable production. The stability of the equipment can be evaluated by examining the manufacturer's reputation, product quality certification, and user reviews.
Consider the maintenance and care requirements of the equipment. Equipment that is easy to maintain and maintain can reduce production costs and downtime.
Control system
Advanced control systems can achieve precise welding parameter control and automated production. Choosing a laser welding machine with an intelligent control system can improve production efficiency and welding quality.
Consider the ease of use and operability of the control system. An easy-to-operate control system can reduce operator training time and error rate.
Safety performance
Laser welding machines are high-energy equipment, and safety performance is crucial. Choose equipment with complete safety protection measures, such as laser protection devices, emergency stop buttons, safety door locks, etc.
Ensure that the equipment meets relevant safety standards and regulatory requirements.
Manufacturer reputation
Choose a laser welding machine manufacturer with a good reputation and rich experience. Well-known manufacturers usually have more reliable product quality and a more complete after-sales service system.
Learn about the reputation and strength of the manufacturer by consulting the manufacturer's official website, product manuals, user reviews, and industry reports.
After-sales service
Good after-sales service can ensure the normal operation and timely maintenance of the equipment. Choose a manufacturer that provides comprehensive after-sales service, including equipment installation and commissioning, training, maintenance and technical support, etc.
Consider the response time and service quality of after-sales service. Timely response and high-quality after-sales service can reduce equipment downtime and production losses.
Choosing the right laser welding machine to weld lithium batteries requires comprehensive consideration of welding requirements, laser welding machine parameters, equipment performance and reliability, as well as manufacturers and after-sales services. By carefully evaluating and comparing different equipment options, you can choose the laser welding machine that best suits your production needs and improve the welding quality and production efficiency of lithium batteries.
Laser welding is a highly precise welding technique that utilizes a laser beam to heat the material to a molten or semi-molten state. By controlling the position and intensity of the laser beam, the materials can precisely join together. Laser welding is typically used in welding tasks that require high precision and complex structures, such as in the field of lithium batteries.
During the laser welding process, the laser beam is focused on a small area of the workpiece surface, raising the temperature to the point where the material melts or reaches a semi-molten state. Moving the laser beam can fuse the welding materials together. Laser welding concentrates energy highly, enabling high-temperature, high-speed, and deep welding while minimizing the heat impact on the surrounding materials.
Laser welding is widely used in the manufacturing of lithium battery applications such as laser welding battery cells etc. For instance, in the electrode manufacturing process of lithium batteries, laser welding is used to connect electrode sheets and electrode wires, ensuring the internal conductivity of the battery. During the battery sealing process, laser welding is employed to weld sealing materials, providing the integrity of the battery casing and preventing leakage of the internal liquid electrolyte.
Through its highly precise characteristics, laser welding technology provides an efficient, stable, and reliable welding solution for lithium battery manufacturing, driving the development and application of lithium battery technology.
Laser welding technology in lithium battery production has many advantages, such as high accuracy, welding stability, non-destructiveness to surrounding materials, scalability for mass production, and high controllability. The advantages are as follows:
Laser welding provides a highly precise welding process to control the welding position and depth. This precision is crucial for small and densely packed battery components, ensuring the stability and reliability of welding points.
Want more information on Lithium Battery Laser Welding Machine? Feel free to contact us.
Laser welding enables the rapid fusion of two materials, which can be identical or different, such as welding aluminum and copper. The high precision and efficiency of laser welding technology ensure the stability and reliability of battery cell components, offering an efficient, stable, and reliable welding solution for lithium battery manufacturing. This, in turn, promotes the development and application of lithium battery technology.
Laser welding is a non-contact welding method, involving no physical contact during the welding process. The heat generated by laser welding is relatively low, reducing the thermal impact on surrounding materials. This is crucial for sensitive components and materials within lithium battery assemblies, avoiding potential issues related to contamination and damage that might occur in traditional welding methods. This aspect is particularly important for delicate battery materials and components.
Laser welding is a rapid and highly efficient welding method. It is characterized by high efficiency and speed, allowing the welding process to be completed in an extremely short time.
The high efficiency of laser welding is advantageous for the high production demands of mass manufacturing. It enhances production efficiency and reduces production costs significantly.
Laser welding offers high controllability, as welding parameters can be adjusted according to different materials and requirements during the laser welding process. This flexibility allows meeting the specifications and designs of various battery packs.
In summary, the application of laser welding battery cells or other components provides manufacturers with high-quality, efficient, and reliable welding solutions.
In the manufacturing of lithium batteries, laser welding technology is primarily applied in six areas: electrode manufacturing, battery encapsulation, battery module assembly, sealing welding of cylindrical batteries, sealing pin welding, and battery management systems.
Lithium batteries constitute vast and intricate systems, comprising various components and layers. Each part may use laser welding technology. The battery cell, the core component of a lithium battery, consists of positive and negative electrodes, electrolytes, and separators. These components are stacked together, forming an electrochemical reaction unit, which serves as the fundamental operational unit of a lithium battery.
In the realm of lithium battery applications, the crucial production steps of 'electrode manufacturing' and 'battery module assembly' involving the laser welding battery cells. This article focuses on detailing the laser welding battery cells.
So, how is laser welding battery cells in lithium battery production? The following provides an overview of the assembly of battery cells using laser welding in lithium battery manufacturing:
In the assembly process of lithium battery cells, laser welding plays a vital role and is utilized for four crucial components: sealing the battery case, connecting the top cover and case, welding the explosion-proof valve, and attaching the tab.
Let's explore how laser welding battery cells'
The purpose of employing laser welding in sealing the lithium battery casing is to ensure the integrity and tightness of the battery shell, preventing electrolyte leakage.
Sealing the lithium battery casing with laser welding is mainly applied to early small-sized lithium batteries with a wall thickness of approximately 0.3mm. It requires sealing welding on all sides, and stainless steel is the primary material.
When welding such products, it is necessary to use the battery laser welding machine produced by HANTENCNC.
Demonstration Video of HANTENCNC's battery laser welder
HANTENCNC's newly launched gantry-type Galvo laser welder, which is particularly ideal for precise laser welding battery cells and other components.
A battery laser welding machine, typically ranging from to watts, is used for this process. A recommended specification for casing sealing is a -watt laser power with an output frequency of Hz.
Inert gases such as argon and nitrogen are utilized during welding to achieve a complete seal on the casing. After welding, the assembled case undergoes a gas filling and discharge test in a water tank.
The welding machine utilizes WSX's industrial dual swing welding head, allowing a weld seam width of up to 5mm with an effective width of 3mm. Combined with a high-resolution CCD camera, real-time monitoring of the welding position and quality is ensured.
Welding Spot for the Lid
To seal the lid and casing, it is necessary to use a battery laser welding machine. The lid welding involves welding all four sides to ensure complete sealing. This means the casing might break even under a gas pressure of 4 kg, but the welded part should stay intact, showing the welding was successful.
Typically, we use the HANTEN CNC -watt battery laser welding machine. We can also design special fixtures for production, making it convenient for our customers.
Laser welding is used for attaching the safety valve to lithium batteries. This ensures that the battery can safely release internal pressure in emergencies, making the battery safer.
Lithium batteries contain a lot of energy and can explode if punctured or squeezed. So, a safety valve is welded onto the battery's top cover. This valve helps release pressure safely, preventing the battery casing from breaking and causing bigger dangers.
The safety valve is usually placed on the battery's top cover. It's made from thinner material and is welded to the casing, as shown in the picture.
For welding these parts, both platform welding and galvanometer laser welding can be used. We suggest using a -watt platform battery laser welding machine with side blowing to control heat and improve the appearance of the weld.
4.4 Laser Welding for Battery Tab Welding in Lithium Battery Production
Laser welding for battery tab welding in the lithium battery production process ensures stable energy conductivity.
Tab welding is common in soft-pack lithium batteries. The tabs, connected to the battery's positive and negative electrodes, are conductive materials like metal, such as copper, brass, or aluminum. Welding requirements include no overlap of materials and precise control of laser energy.
Laser Welding
VS Traditional Ultrasonic Welding
When welding tabs, we recommend using a laser galvanometer welding machine with a maximum swing speed of mm/s, combined with a - watt laser. This setup can weld aluminum or copper tabs ranging from 1-2.5mm.
Compared to traditional ultrasonic welding, the key advantage of laser galvanometer welding machines is that they require no consumables and produce minimal or no waste gases or smoke, ensuring high processing efficiency.
HANTENCNC offer platform welding machines and galvanometer welding machines with various stroke lengths. if you interest at laser welding battery cells or our battery laser welding machines, feel free to contact us.
If you want to learn more, please visit our website Lithium Battery Explosion Valve Laser Welding Machine.