How many welding methods are there for lithium ion batteries? Application of laser welding in lithium ion battery industry. As the core component of new energy vehicles, the quality of power lithium battery directly determines the performance of the whole vehicle. The accuracy and automation level of lithium-ion battery manufacturing equipment will directly affect the production efficiency and consistency of products. As an alternative to traditional welding technology, laser processing technology has been widely used in lithium battery manufacturing equipment.

It is essential to clean the lithium-ion battery welding machine before welding. Foreign matters often appear at the upper and lower electrodes. Power on inspection is necessary when using the spot welding machine, which is an important link when using the spot welding machine. Sometimes electrical equipment may be exposed. Of course, there may be leakage in our gas circuit system, so we must check it before using the lithium-ion battery, So as to ensure the safety of our production.

How many welding methods are there for lithium ion batteries?

1. Wave soldering: it is essentially a combination of ultrasonic welding and laser welding;

2. Ultrasonic welding: the advantage of this method is that the welding is simple, but it takes up more space, and the volume grouping efficiency of the module will be low;

3. Laser welding: at present, this method is the most widely used, but its structure is slightly different;

4. Laser welding of dissimilar metals: this welding method has high group efficiency and fast production speed.

Application of laser welding in lithium ion battery industry

The key technology for the future development of electric vehicles is the safety, cost and energy storage capacity of power lithium-ion batteries. The manufacturing process of power lithium battery is complex and requires high safety; One of the key technologies in the manufacturing process is laser welding technology; The laser welding process of power lithium battery includes battery soft connection welding, top cover welding, seal nail welding, module and pack welding. Power lithium battery has many laser welding parts and high requirements for reliability and safety, which puts forward higher requirements for laser welding equipment.

The welding of battery explosion-proof valve adopts pulse laser welding to realize continuous sealing welding through the overlap and coverage of welding points, but the welding efficiency is low and the sealing performance is relatively poor. Continuous laser welding can realize high-speed and high-quality welding, and the welding stability, welding efficiency and yield can be guaranteed.

The shell materials of power lithium battery include aluminum alloy and stainless steel, of which aluminum alloy is the most, generally 3003 aluminum alloy, and a few use pure aluminum. Stainless steel is the material with the best Laser Weldability, especially 304 stainless steel, which can obtain welds with good appearance and performance whether pulsed or continuous laser.

Laser welding takes the laser beam as the energy source, and uses the focusing device to gather the laser into a high-power density beam to irradiate on the surface of the workpiece for heating. Under the heat conduction purpose of metal materials, the material melts inside to form a specific solution pool. When laser welding is used, the heat affected zone of the workpiece is small; Small welding spot and high welding dimensional accuracy; The welding method belongs to non-contact welding, without external force, and the product deformation is small; High welding quality; High efficiency and easy to realize automatic production.

With the continuous progress of technology and process methods, the characteristics of laser as a non-contact flexible manufacturing tool will be more obvious. Laser manufacturing is bound to become an advanced manufacturing technology with convenience, high efficiency, green environmental protection, energy conservation and consumption reduction, promote the technological progress and product technological transformation in China's industrial field, and meet the needs of the development of the national economy, especially the manufacturing industry.

China's laser industry is developing rapidly. Laser welding has made a breakthrough, and the equipment price will be further reduced, which will reduce the use cost of laser welding in the production of lithium-ion batteries. Initially, more lithium-ion battery manufacturers will choose laser welding. Laser welding will be more and more widely used in lithium-ion battery industry, and form a new development trend.