Power battery is the core component of new energy vehicles. The quality of lithium battery directly determines the performance of new energy vehicles. Therefore, its manufacturing process and production equipment have high precision requirements.

The production and manufacturing of lithium battery is connected from one process to another. The production process is mainly divided into three parts: pole piece manufacturing, cell manufacturing and battery assembly.

As an advanced "optical" manufacturing tool, laser technology plays an important role in the front, middle and rear processing of power battery production line because of its high efficiency, precision, flexibility, reliability and stability, low welding material loss, high automation and safety.

Laser lithium battery equipment: used for front, middle and rear processing, standard configuration of power battery production line.

It covers multiple processes of lithium battery, such as laser cutting / laser welding / laser marking / laser cleaning, and helps improve battery performance and production efficiency.

Laser Welding

Laser welding is a process that uses laser beam to melt objects and realize welding. In the manufacturing process of lithium batteries and battery packs of new energy vehicles, there are more than 20 processes that need to realize conductive connection or sealing by welding.

Specifically, the laser welding application process includes:

1. pole piece manufacturing section - front section: laser cutting process is applied to pole piece and diaphragm slitting.

2. cell assembly section - middle section: the laser welding process is applied to the welding links such as shell, top cover, sealing nail, pole lug, etc.

3. post processing section - rear section: welding of connecting pieces during battery pack module.

Laser Cutting

Laser cutting is a process that uses high power density laser beam to realize cutting. Laser cutting has the advantages of no physical wear, flexible cutting shape, edge quality control, higher accuracy and lower operating costs, which is conducive to reducing manufacturing costs, improving production efficiency and greatly shortening the die-cutting cycle of new products.

Specific application process of laser cutting

In the production of power batteries, it is mainly used in the manufacturing of battery poles in the previous process.

It includes laser electrode lug cutting and shaping of positive and negative electrodes, laser electrode slice cutting, laser electrode slice splitting, and laser cutting of diaphragm; Among them, laser electrode lug forming is the most important application of laser cutting in the field of lithium battery manufacturing.

Laser Marking

In order to better control the product quality and trace the whole process production information of lithium batteries, it is necessary to store the key information (including raw material information, production process and process, product batch, manufacturer and date, etc.) in the two-dimensional code and identify it on the battery.

The traditional ink jet printing technology has the problems of easy friction and long-term lack of information. However, laser marking has the characteristics of strong permanence, high anti-counterfeiting, high precision, strong wear resistance, safety and reliability, which can provide the best solution for product quality tracking.

Laser Cleaning

In the manufacturing process of lithium battery, the coating on the electrode lug area to be welded needs to be cleaned before welding the electrode lug. The main methods to remove the coating are mechanical scraping, sticking styrofoam and laser cleaning.

The mechanical scraping method is easy to damage the electrode, and it is difficult to ensure that the coating is cleaned; The process of sticking foam adhesive has many processes, high production cost, and is not suitable for anode aqueous slurry.

Laser cleaning has the advantages of green, high efficiency, good cleaning effect and little damage to the copper foil. It is recognized as the preferred method for removing the coating on the front and back sides of the anode plates of lithium batteries, so that the copper foil can be directly exposed for electrode lug welding.

As a high-precision production process, the application of laser technology effectively improves the safety, reliability and service life of power batteries. The power battery energy density, safety performance and production automation requirements are gradually improved, which puts forward high requirements for the accuracy, safety and consistency of production equipment.