In the past two years, the blowout development of new energy vehicles has attracted more and more attention from the outside world. Not only is it influenced by consumers, but the technological trend led by new energy vehicles has also grown into a powerful force that cannot be ignored in the industrial field. What we are going to talk about today is the laser welding process applied to the power core of new energy vehicles-batteries.

Batteries, motors and electronic controls are the three core components of new energy vehicles. As the power core, the power battery accounts for the highest cost in the whole vehicle and has the greatest impact on the battery life and safety. It is not necessary to say more about its importance.

In the process of power battery processing and assembly, many steps need to be completed by welding, including explosion-proof valve sealing welding, pull ring welding, soft connection welding, helmet spot welding, battery shell sealing welding, module and PACK welding, etc., covering power battery processing Start to finish of assembly. In the past, these processes were done by traditional welding machines, but emerging laser processing has gradually taken over the heavy responsibility of welding and become a better choice.

The selection of welding method and welding process will directly affect the cost, quality, safety and consistency of the battery. Among many welding methods, laser welding stands out with the following advantages: First, laser welding has high energy density, small welding deformation, and small heat-affected zone, which can effectively improve the accuracy of parts. Grinding work; secondly, laser welding can be precisely controlled, the focus spot is small, high-precision positioning, and it is easy to achieve automation with the robotic arm, improve welding efficiency, reduce man-hours, and reduce costs; Like arc welding, it is susceptible to meltback.

The structure of the battery usually contains a variety of materials, such as steel, aluminum, copper, nickel, etc., which may be made into electrodes, wires, or casings; therefore, whether it is between one material or between multiple materials Welding puts forward higher requirements for welding process. The technological advantage of laser welding lies in the wide range of materials that can be welded, and the welding between different materials can be realized.

In general, the technical advantages brought by laser welding improve the safety, reliability and service life of power batteries, and provide new potential energy for the further development of batteries and even the new energy vehicle industry.