With the rapid development of renewable energy and new energy vehicles, lithium-ion batteries have become an indispensable energy storage device. However, the manufacturing process of lithium batteries requires a laser welding process to make the internal structure of the battery strong and enhance its durability. In this process, lithium battery laser welding machine for its high efficiency, precision, pollution-free and other advantages and received widespread attention.

First, the principle and characteristics of lithium battery laser welding machine

Lithium battery laser welding machine is the use of laser beams on the material to heat and melt a welding method. It has the following characteristics:

High precision: the diameter of the laser beam can reach sub-millimeter level, the welding position and size adjustable, so it can achieve high precision welding.

Fast speed: Since laser welding is non-contact, it can realize fast welding and improve productivity.

Less pollution: laser welding adopts non-contact welding method, which will not produce any harmful gases and wastes in the welding process, so it is more environmentally friendly.

Second, the application of lithium battery laser welding machine

Lithium battery laser welding equipment is mainly used in the connection of positive and negative pole pieces of lithium-ion batteries, the sealing of electrolyte injection holes, the sealing of the battery cover and other fields.

Connection of positive and negative pole pieces: positive and negative pole pieces are one of the core components of lithium-ion batteries. In its manufacturing process, it is necessary to stack the multi-layer sheets according to a certain law and realize the connection between each other through laser welding technology. The lithium battery laser welding machine can ensure the uniform distribution of battery pressure and improve the service life of the battery.

Sealing of electrolyte injection holes: Since lithium-ion batteries need electrolyte to run, some injection holes need to be cut out of the battery shell. These holes need to be sealed to avoid electrolyte leakage. The sealing process can be completed in a shorter period of time using laser welding technology, and the sealing process is more stable and solid.

Sealing of the battery cover: Sealing of the battery cover is one of the most important measures to ensure that the battery is waterproof, dustproof and corrosion-resistant. The traditional welding process requires the insertion of solder between the cover and the battery shell, by resistance welding, which may lead to unsatisfactory welding quality or unnecessary gaps. Laser welding technology, on the other hand, can directly weld the cover and shell, avoiding the above problems.

Third, the development trend of lithium battery fiber laser welding machine

At present, the technology is not good lithium battery laser welding machine equipment manufacturers still have some problems, such as welding may produce cracks, easy to make the battery internal subtle deformation, etc., Haivi laser lithium battery laser equipment will not appear these problems. The future development of lithium battery laser welding machine is mainly focused on the following directions:

1. Improvement of precision and stability: Although the existing lithium battery laser welding machine has been very high precision, but in some areas still need higher precision, such as miniature batteries, 3D printing and so on. In the future, laser welding technology will pay more attention to the improvement of precision and stability.

2. The application of automated production lines: at present, most manufacturers still use manual operation for lithium battery welding, which is not only inefficient, but also prone to welding quality instability and other issues. In the future, laser welding technology will be widely used in automated production lines to improve production efficiency, but also to ensure the stability of welding quality.

3. The application of new materials: the traditional lithium-ion batteries use graphite anode and metal oxide anode, but the energy density of these two materials is relatively low, so it is difficult to meet the future demand for lithium-ion batteries with high energy density. In the future, lithium battery laser welding machine will get more attention in the research and application of new materials, such as silicon anode, sulfide anode, etc. These new materials can significantly improve the energy density of lithium-ion batteries, so as to better meet future demand.

In short, the lithium battery laser welding machine has a broad application prospects, and will be more research and development in the future. Through continuous improvement and innovation, laser welding technology will become one of the key technologies for manufacturing high-quality lithium-ion batteries.