"Revolutionizing Power Battery Manufacturing with Laser Welding Technology: The Ultimate Guide to Efficiency, Safety, and Precision"

Laser welding technology presents an array of advantages, encompassing deep penetration, rapid speed, minimal deformation, and more. These advantages play a pivotal role in bolstering the safety of power batteries. The versatility of laser welding technology is evident in its insensitivity to the welding environment, high power density, immunity to magnetic fields, and lack of limitation to conductive materials. Notably, it operates without the need for vacuum conditions and does not emit X-rays during the welding process. Consequently, it finds widespread applications in the production of new energy vehicles and power batteries, significantly enhancing processing efficiency, welding precision, safety, reliability, consistency, cost reduction, and extended service life.

 

Laser welding is harnessed in the manufacturing of power batteries for core assembly and battery packs.

 

In the cell assembly section, laser welding processes are employed to fuse the shell, top cover, sealing nails, pole lugs, and other connections. The core assembly segment encompasses core winding, stacking, lug welding, core insertion into the shell, shell top cover welding, liquid injection, and packaging of liquid injection ports. The battery cell, being the smallest unit of the power battery, holds sway over the performance of the battery module, thereby impacting the reliability of the entire power battery system. In comparison to traditional argon arc welding and resistance welding, laser welding offers notable advantages:

 

- Narrow heat-affected zone, particularly suitable for micro-parts, resulting in minimal welding deformation.

- Application of welding at a distance through optical fiber guidance or prismatic deflection.

- Very high energy density.

- No requirement for vacuum or X-ray protection, and immunity to magnetic fields.

 

In the post-processing section, laser automation systems supplant conventional manual assembly methods in module PACK production. Specific processes in this section encompass chemical composition testing and classification, PACK module assembly, and the utilization of main equipment such as chemical formation machines, capacity separation and testing devices, process storage and logistics automation, and PACK automation equipment. The laser automation system is commonly integrated into the module PACK assembly line for welding connecting pieces in the battery PACK module. Moreover, lasers are utilized for welding explosion-proof valves onto the cover plate after module assembly. These valves typically consist of two aluminum metal sheets laser-welded into a specific shape, with designed grooves to rupture and relieve pressure when battery pressure is too high. The precise positioning of these valves poses a challenge, necessitating strict requirements for the laser welding process to ensure stable destructive pressure values within a certain range.

 

In the battery assembly process, laser cleaning is employed to ensure the safety of lithium battery cells by treating their external surfaces with adhesive insulation. This insulation serves to prevent short circuits and safeguard the internal components from damage. Laser cleaning, being an environmentally friendly method, does not produce harmful pollutants. 

 

Laser marking is utilized to enhance product quality control and trace the complete production information of lithium batteries, including raw material details, production processes, technology, product batch, manufacturer, and date. This information is stored in two-dimensional codes and marked on the batteries using laser marking technology, which offers features such as permanence, anti-counterfeiting, high precision, wear resistance, safety, and reliability, providing an optimal solution for tracking product quality.