What is battery tab welding?

What is battery tab welding?

Battery tab welding is a key step in battery production and mainly involves welding together multiple layers of tab foils and connecting sheets. Among them, the material of the positive connecting piece is usually aluminum, while the material of the negative connecting piece varies according to the type of battery. For example, prismatic batteries usually use copper, while soft-pack batteries use nickel or copper plated with nickel.

The tab is the part that connects the electrode sheet and the battery cover, and plays an important role in the current output process. The main purpose of battery tab welding is to ensure that the current inside the battery can flow smoothly, while ensuring the stability and safety of the battery structure.

During the welding process, the parameters of the welding equipment, such as welding temperature, time and pressure, need to be accurately controlled to ensure welding quality. If the welding energy is too high, it may cause part of the tabs to be welded through or the two layers of tabs to stick together; while if the energy is too small, it may cause virtual welding or missing welding, both of which may cause safety issues such as battery short circuits.

Currently, ultrasonic metal welding and laser welding are commonly used technologies for battery tab welding. Ultrasonic metal welding has the advantages of low heat generation and low internal resistance after welding, and is especially suitable for multi-layer tab welding. Laser welding technology also has broad application prospects in the power battery industry, and can achieve precise welding of multi-layer tabs and connectors.

In general, battery tab welding is an indispensable part of the battery manufacturing process and is of great significance to improving battery performance and safety. However, due to the complexity and precision requirements in the welding process, this is also one of the lower yield areas in battery production. Therefore, continuously optimizing welding processes and technologies and improving welding yield are the goals that the battery manufacturing field continues to pursue.

Why do we need to precisely control parameters during the battery tab welding process?

The main reasons why parameters need to be precisely controlled during battery tab welding are as follows:

First of all, welding parameters such as welding time, current size, pressure level, etc. directly determine the welding heat and welding quality. If the parameters are set improperly, the welding energy may be too large or too small. When the energy is too high, part of the tabs may be welded through or the two layers of tabs may be stuck together. When the energy is too small, it may result in weak or missed soldering. These welding defects may affect the current transmission efficiency of the battery and the stability of the battery structure, thereby affecting the overall performance and safety of the battery.

Secondly, for high-precision welding methods such as laser welding, factors such as laser power density, welding speed, and the matching of laser power density and welding speed will have a significant impact on welding quality. By precisely controlling these parameters, high-quality laser welding can be achieved and the stability and reliability of welding can be improved.

In addition, the control of welding parameters is also closely related to the performance and maintenance status of welding equipment. Regular maintenance and calibration of welding equipment can ensure that it is in optimal working condition, thereby further improving the accuracy of welding parameter control.

To sum up, precise control of parameters during the welding process of battery tabs is a key measure to ensure welding quality and improve battery performance and safety. In actual production, it is necessary to comprehensively consider factors such as battery type, tab material, and welding method, and reasonably select and adjust welding parameters to achieve optimal welding results.

What type of laser equipment is used for battery tab welding?

The main types of laser equipment used for battery tab welding include spot welding laser welding machines and pull welding laser welding machines.

Spot welding laser welding machine is a traditional welding method that uses spot welding and continuous optical fiber output to complete the connection between electrodes and leads. This welding method has the advantages of small welding points, fast welding speed, and reliable welding. It is often used in battery modules, power batteries and other fields.

The pull welding laser welding machine uses pull welding to complete the welding by stretching the electrodes and leads. Compared with spot welding, pull welding is more suitable for welding small batteries, such as watches, mobile phones, etc.

When selecting laser equipment, you need to consider various factors such as battery type, tab material, and production needs. At the same time, the performance, stability, accuracy and ease of operation of the equipment are also important considerations in selection.

In addition, with the continuous development of technology, new laser welding equipment is also emerging, such as high-speed scanning laser spot welding machine, gantry laser welding machine, etc. These equipment are also widely used in battery tab welding.

To sum up, there are various types of laser equipment used for battery tab welding, and the specific selection needs to be weighed based on actual needs and conditions.

How stable is the laser welding equipment in battery tab welding?

Laser welding equipment has demonstrated excellent stability in battery tab welding. This is mainly due to the high precision and reliability of laser welding technology, as well as the strict quality control of laser welding equipment in the design and manufacturing process.

First of all, laser welding technology has the characteristics of high precision and high reliability. The laser beam can precisely control the energy and focus position to achieve fast, efficient and reliable welding. This technical feature enables laser welding equipment to accurately fix multi-layer tab foils and connecting sheets together during battery tab welding, ensuring the consistency and stability of welding quality.

Secondly, laser welding equipment has undergone strict quality control during the design and manufacturing process. The equipment uses high-quality lasers and optical systems to ensure the stability and accuracy of the laser beam. At the same time, the equipment is also equipped with advanced control systems and monitoring systems, which can monitor various parameters during the welding process in real time, such as welding temperature, pressure and speed, etc., to ensure the stability and reliability of welding quality.

In addition, laser welding equipment also has a high level of automation and intelligence. By being equipped with automatic loading and unloading systems, distance meters, code readers and CCD systems, laser welding equipment can realize automatic positioning of workpieces and automatic monitoring of the welding process. This greatly reduces the impact of human factors on welding quality and improves the stability and reliability of welding.

In summary, laser welding equipment has demonstrated excellent stability in battery tab welding. However, in order to ensure the long-term stable operation of the equipment, it is also necessary to perform regular maintenance and maintenance on the equipment, promptly replace worn parts and adjust parameter settings to maintain the best working condition of the equipment.

What are the advantages of laser welding in battery tab welding?

Laser welding has many significant advantages in battery tab welding, mainly reflected in the following aspects:

1. **Welding speed and quality**: Laser welding can shorten the welding time to the millisecond level, significantly improving production efficiency. At the same time, due to the high energy density and precise control of the laser beam, the welding quality is high, the welds are uniform and beautiful, and the possibility of welding defects is reduced.

2. **Strong adaptability**: Laser welding can weld tabs of different materials and has extremely high adaptability. Whether it is copper, aluminum or other metal materials, laser welding can achieve high-quality connections.

3. **Small thermal impact**: Laser welding has the characteristics of local heating, which has little thermal impact outside the welding area and will not generate too much heat on the battery and cause battery aging. At the same time, it avoids welding instability caused by uneven electrode contact area, as well as problems such as electrode oxidation and deformation.

4. **High welding precision**: Using laser welding technology can achieve smaller solder joints and smaller spacing, making the design of the circuit board more refined. At the same time, laser welding equipment is usually equipped with advanced control systems and monitoring systems, which can achieve precise control and monitoring of welding parameters and ensure the consistency of welding quality.

5. **Environmental protection and energy saving**: Laser welding equipment occupies a small area and can release a lot of space for other flexible arrangements. At the same time, laser welding has no air and noise pollution, and no dust. It is a product of Xinliyuan and is more suitable for use in high-tech dust-free workshops. In addition, the laser has low power consumption, high electro-optical conversion rate, low equipment loss, and greatly reduced maintenance costs, reducing production costs.

6. **High degree of automation**: Laser welding equipment is usually equipped with automatic loading and unloading systems, distance meters, code readers and CCD systems, etc., which can realize the automation and intelligence of the welding process and improve production efficiency and welding quality.

In summary, laser welding has many advantages in battery tab welding, which can significantly improve welding speed, quality and stability, reduce production costs, and enhance product competitiveness. Therefore, laser welding has been widely used and popularized in the battery manufacturing industry.