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.
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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.
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.
If you want to learn more, please visit our website Lithium Battery Explosion Valve Laser Welding Machine.
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.
As the demand for high-performance, long-lasting batteries continues to rise, ensuring the quality and reliability of the battery assembly process has become critical. Laser welding is one of the cutting-edge technologies that has contributed significantly to the advancement of battery technology. This article will take you inside the world of laser welding for lithium batteries, providing a comprehensive overview of the unique capabilities and applications of this precision welding technology.
Laser welding technology is an advanced processing technology for the production of high-performance power batteries. Since power batteries need to have multiple welding parts and it is difficult to carry out high-precision requirements met by traditional welding methods, laser welding technology can weld welds with high quality and automation due to the characteristics of small welding consumables loss, small deformation, strong stability and easy operation. Applied to the welding e-mobility battery, it can greatly improve the safety, reliability and service life of the battery.
Ultrasonic welding utilizes mechanical vibrations generated by high-frequency vibrations (usually above 20 kHz) to heat the welded joints, melting and joining the materials together. In lithium battery production, ultrasonic welding is commonly used to connect battery cells to electrode foils, electrode cells to electrolyte films, and battery cells to battery casings and other components. It provides a highly accurate and stable weld, avoiding thermal damage and the introduction of impurities.
Laser welding uses a laser beam to heat the weld joints to a high temperature, causing the materials to melt and join together. Laser welding offers high energy density and joint precision. Laser welding is commonly used to join components such as electrode foils, battery casings, and battery connecting tabs. It provides non-contact, high precision and high speed welding for a wide range of different materials and complex geometries.
Resistance welding is a welding method that heats and joins two materials by generating heat through the material with an electric current. Resistance welding is commonly used to weld components such as battery cells to electrode foils and battery cells to connecting tabs. It is a common welding method, but requires proper control to avoid overheating and thermal damage.
TIG welding uses the high temperatures generated by the arc to melt the weld material, while an inert gas (usually argon) is used to protect the weld area from oxidation. TIG welding is commonly used to join components such as battery cases, battery covers, and battery leads.
Laser welding lithium ion batteries is a highly advanced and efficient welding method. It not only improves production efficiency but also ensures product quality and stability.
1. Efficiency: Compared to traditional welding methods, laser welding of lithium-ion batteries offers higher efficiency. This is because laser welding can complete a large amount of work in a short time without the need for any auxiliary materials.
2. High Precision: Laser welding of lithium-ion batteries can achieve very high precision. This is because the laser beam can focus precisely on the weld seam, ensuring the quality and stability of the welding.
3. Environmentally Friendly: Laser welding of lithium-ion batteries does not produce any harmful substances, making it very environmentally friendly. Additionally, as it does not require the use of solvents or other chemicals, it can also reduce waste production.
4. High Welding Quality: Lithium-ion battery laser welding equipment uses a non-contact welding method, which means there is no mechanical contact, thus avoiding the possibility of material damage after welding. Furthermore, the laser beam locally heats the welding area, allowing the welding area to quickly reach a high temperature, followed by rapid cooling, resulting in rapid solidification of the welding area, creating strong and aesthetically pleasing weld seams.
5. Wide Applicability: Laser welding of lithium-ion batteries can be applied to various types of lithium-ion batteries, including lithium-ion, polymer lithium-ion, and NMC lithium-ion batteries. Additionally, it can also be applied to various materials, such as aluminum, copper, stainless steel, etc.
By using laser welding, it is possible to efficiently and precisely weld critical components such as battery protection boards, tab connections, battery cover plates, series connectors, terminals, and more during the production process. Compared to traditional methods like brazing and resistance welding, laser welding technology can reduce material costs, increase production efficiency, and enhance the quality of weld seams.
1. In EV: With the increasing popularity of electric vehicles, there is a growing demand for high-performance and high-safety batteries. Replacing traditional welding techniques with laser welding in the production of power battery modules for electric vehicles not only significantly increases production speed but also improves the qualification rate of lithium battery pack modules and the safety of the travel safety.
2. in the energy storage industry: storage systems are a crucial focus in the future of energy development. Laser welding for storage batteries can offer a more reliable and secure battery connection solution for energy storage systems.
3. Liquid cooling plates: The performance of liquid cooling plates can impact the performance of power batteries. As the structure of liquid cooling plates becomes more diverse, the requirements for welding processes are increasingly demanding. Laser welding, with its high-precision welding control, can achieve micron-level accuracy, which is crucial for manufacturing complex geometries and structures of battery liquid cooling plates. Laser welding of water cooling plates can improve welding efficiency, increase welding productivity, reduce welding costs, and enhance welding quality and stability.
4. in the electronics industry: As people rely more on portable electronic devices, the demand for high-performance and high-capacity batteries continues to grow. Laser welding machine for lithium batteries can provide more stable and efficient battery solutions for electronic products.
Laser welding system for lithium-ion batteries is widely used in various stages of the battery production process, including the welding and connecting of components such as tabs, cells, series connectors, protection plates, and terminals. Thanks to its efficiency and precision, laser welding equipment has become an essential tool for lithium battery manufacturers.
During the assembly and welding of lithium battery pack, a significant amount of nickel-plated copper or nickel-plated aluminum is used to connect battery cells. The primary method of connection is nickel-aluminum welding. However, aluminum alloys have high reflectivity and are sensitive to the formation of pores, leading to issues like porosity, thermal cracks, and ruptures during the welding process. The design and welding quality of the automatic laser welding machine will affects the cost, quality and safety of lithium battery packs.
DPLASER, many years of experience in industrial laser equipment production, has developed an automatic laser welding machine designed for battery module manufacturing. This lithium battery laser welding machine utilizes laser technology to complete the welding process and can be equipped with visual positioning software for precise alignment and a multi-axis linkage system. The equipment is characterized by high efficiency, minimal consumables, aesthetically pleasing weld seams, strong weld joints, and user-friendly operation. It can be seamlessly integrated into automated production lines, enhancing the production capacity and efficiency of lithium battery pack assembly lines, meeting the battery welding needs of various industries. Additionally, we also offer customized robotic laser welding solutions for welding battery terminals, casings, and cover plates ensuring seal welding.
E-Mobility battery laser welding machine can weld battery tabs, terminals and lithium battery modules and cases.
1. Outstanding performance ensures a consistently strong and reliable welding effect, delivering top-notch results every time.
2. This welding system maintains a high level of stability during operation, utilizing a fully-automatic welding method that streamlines the process and saving labor
3. Its compact size makes it effortlessly integration with production lines, facilitating a smooth and efficient assembly process.
4. With remarkably low energy consumption, this welder is virtually maintenance-free, saving you both time and money in the long run.
5. Engineered for longevity, this welding equipment is exceptionally durable and boasts an extended service life, offering sustained value over time.
6. Its exceptional efficiency allows for rapid and precise welding, boosting productivity and reducing production time.
7. In addition to its impressive performance and features, this welding solution proves to be a cost-effective choice, making it an attractive option for businesses looking to optimize their welding processes without breaking the bank.
The applications of laser technology in the new energy industry, especially in the manufacture of battery packs and lithium battery, has been gradually expanding to include equipment such as battery laser welding machines and laser marking machines. Laser marking machines have a variety of applications in lithium battery manufacturing, and they help mark, track, identify and manage battery packs, improving quality control, production efficiency and product traceability.
Battery Component Marking: Laser marking machines can be used to mark battery components, such as battery cells, battery lugs, battery terminals, battery casings, etc., to ensure that they can be tracked and identified. This marking can include information such as product model, date of manufacture, company logo, barcode or QR code.
Manufacturing date and lot traceability: Laser marking machines can be used to mark manufacturing date and lot information on battery components for traceability and quality control when required.
Tracking and Management: The marking information from the laser marking machine can be used to build a database of information about the battery assembly to track the performance, history and usage of each cell. This is very helpful in the management and maintenance of battery components.
Customized marking: Battery manufacturers can use laser marking machines to mark battery components with customized information according to customer requirements, such as customer logos, special specifications or serial numbers.
Using laser marking machines for lithium battery manufacturing helps to improve product quality, traceability and management efficiency. They provide high-precision, non-contact and efficient automated marking solutions for a wide range of battery pack sizes and shapes.
Finally:
Laser welding finds extensive and dynamic applications in the lithium-ion battery industry, enabling precise and efficient connections in the complex field of battery assembly. From ev battery to batteries for electronic devices, lithium battery laser welding machine is broad and far-reaching. Whether you are a manufacturer in battery manufacturing or simply curious about innovative technologies driving the development of the battery industry, we are eager to explore the various possibilities that laser welding brings to the world of lithium-ion batteries with you.