Driven by the strong support of national policies and the acceleration of the promotion and application of new energy vehicles, the demand for power batteries for vehicles in China has increased significantly. Among the three core components of new energy vehicle batteries, motors, and electronic control, the core component power lithium battery accounts for a high proportion of the vehicle cost, which also directly determines the vehicle’s cruising range. As a new type of clean energy, lithium batteries are not only used in new energy vehicles, but also in electric bicycles, golf course vehicles and some 3C products.

The production of lithium batteries is connected by a series of processes, and the production process is mainly divided into three parts: pole manufacturing, battery cell production and battery assembly. The quality of lithium batteries directly determines the performance of new energy vehicles, so their manufacturing processes have extremely high precision requirements. As an advanced “light” manufacturing tool, laser technology is widely used in the cutting, cleaning, and welding of power paving battery components due to its high efficiency, precision, flexibility, reliability and stability, low consumption of welding materials and high safety. And coding and other processes.

Laser welding

In the manufacturing process of lithium batteries and battery packs for new energy vehicles, there are more than 20 processes that need to be welded to achieve conductive connection or sealing. The quality of welding plays a vital role in the safety of the entire vehicle.

Compared with traditional argon arc welding, resistance welding and other methods, laser welding has significant advantages such as small heat-affected zone, non-contact processing, and high processing efficiency. Different materials can achieve excellent welding efficiency, which is indispensable in the production of power batteries. The standard process has been widely used in welding of tabs, battery core shells, sealing nails, flexible connections, explosion-proof valves, battery modules, etc.

Applications

Square aluminum shell battery cover is fully welded

Square aluminum shell battery lug soft connection

Rectangular aluminum shell battery pole welding

Welding of Busbar connecting piece for square aluminum shell battery

laser cutting

The processing of lithium batteries requires high precision and quality. Before the advent of laser technology, the lithium battery industry usually used traditional machinery for processing and cutting. However, traditional die cutter equipment will inevitably wear out and dust will fall during use. And produce burrs, and then cause various dangerous problems such as battery overheating, short circuit, and even explosion.

In order to avoid the danger caused by poor processing quality of lithium batteries, laser cutting is more suitable. Compared with traditional mechanical cutting, laser cutting has the advantages of no physical wear, flexible cutting shape, edge quality control, higher accuracy and lower operating costs. It is conducive to reducing manufacturing costs, improving production efficiency, and greatly shortening new product models. Cut cycle.

Laser cleaning

In the lithium battery manufacturing process, before welding the lugs, it is necessary to clean the coating on the area of the lugs to be welded. The methods of removing the coating mainly include mechanical scraping, applying styrofoam and laser cleaning. Among them, the mechanical scraping method is easy to damage the pole pieces, and it is difficult to ensure that the coating is cleaned; the styrofoam method has more processes, high production costs, and is not suitable for anode water-based slurry.

Laser cleaning has the advantages of green, high efficiency, good cleaning effect, and less damage to the copper foil. It is recognized as the preferred method for removing the coating film on the front and back of the anode electrode of the lithium battery and leaving the copper foil exposed directly for tab welding. .