Battery pack laser welding machine technology upgrade: empowering new energy industry efficient and intelligent manufacturing new era

With the explosive growth of the global new energy vehicle and energy storage industry, the market demand for power batteries and energy storage batteries continues to rise. According to the latest statistics of the China Association of Automobile Manufacturers, the sales volume of new energy vehicles in China exceeded 3 million in the first half of 2024, an increase of 35.2% year-on-year; the installed capacity of energy storage batteries reached 28.3 GWh, an increase of 62.7% year-on-year. In the battery pack manufacturing process, the welding link is the core process of connecting the battery cells, polar ears and busbars. Its precision and efficiency directly affect the safety, consistency and service life of the battery pack. Traditional welding technology has been difficult to meet the current demand for battery products with high energy density and long cycle life, while the battery pack laser welding machine has gradually become the mainstream solution in the industry with its advantages of high precision and low thermal impact.

For a long time, resistance welding, ultrasonic welding and other technologies commonly used in battery pack manufacturing have obvious limitations. Resistance welding generates heat to melt the workpiece through current, but it is easy to cause inconsistent welding strength due to uneven current distribution, and the heat affected zone is large, which may damage the surrounding battery cells. Ultrasonic welding relies on high-frequency vibration to achieve connection, but it has strict requirements on material thickness and surface cleanliness, and is prone to problems such as virtual welding and desoldering, especially in large-size battery module welding. These pain points not only affect the performance of the battery pack, but also increase the maintenance cost in the later stage, restricting the high-quality development of the new energy industry.

The appearance of the battery pack laser welding machine has effectively solved the above problems. The equipment uses a high energy density laser beam as a heat source, which can achieve precise local heating. The welding accuracy can reach ±0.05mm, and the heat affected zone is less than 0.1mm, which is far superior to the traditional welding method. In addition, the laser welding process has no contact and no external force, avoiding mechanical damage to the battery cells; at the same time, the laser beam can be transmitted through the optical fiber, which is easy to integrate with the automated production line to achieve continuous and efficient mass production. For example, after a head power battery company introduced the laser welding machine, the battery pack welding yield increased from 92% to 99.5%, and the production efficiency increased by 40%.

In recent years, the battery pack laser welding machine technology has been iteratively upgraded. First, the use of fiber laser source, stable output power, excellent beam of light quality, suitable for welding of different materials (such as aluminum, copper, nickel); second is the integrated visual positioning system, through high definition camera real-time capture welding position, automatic correction deviation, to ensure welding accuracy; third is to add real-time quality monitoring module, using spectral analysis, temperature sensing and other technologies, online detection of welding defects (such as pores, cracks), timely feedback adjustment process parameters. A new generation of battery pack laser welding machine launched by a laser equipment manufacturer also has adaptive welding function, which can automatically optimize welding power and speed according to cell thickness and material characteristics, and further improve welding quality.

In addition to the field of power batteries, battery pack laser welding machines are also widely used in scenarios such as energy storage batteries and consumer electronics batteries. In energy storage battery module welding, due to the larger size of the module and the larger number of cells, higher requirements for welding consistency are required. The high-precision characteristics of the laser welding machine can effectively guarantee the stability of the energy storage system. In the field of consumer electronics, such as battery packs for smartphones and laptops, laser welding machines can realize miniaturized welding to meet the needs of lightweight products. According to market research institutions, the global battery pack laser welding machine market size will grow at a compound growth rate of 22.3% from 2024 to 2029, with new energy and energy storage contributing the largest increase.

The support of national policies has also promoted the development of the battery pack laser welding machine industry. The "New Energy Vehicle Industry Development Plan (2021-2035) " clearly states that it is necessary to improve the manufacturing process level of power batteries and promote advanced welding technology; the "14th Five-Year" Energy Storage Industry Development Plan also emphasizes that it is necessary to strengthen the research and development and application of energy storage battery manufacturing equipment. These policies provide a good development environment for the technological innovation of laser welding machines. At the same time, with the continuous expansion of the new energy industry, the demand for laser welding equipment from battery enterprises will further increase, driving the industry's technological iteration and market scale expansion.

In the future, battery pack laser welding machines will develop in the direction of higher precision, more intelligence, and greener environmental protection. On the one hand, with the rise of new battery technologies such as solid-state batteries, laser welding machines need to adapt to the welding needs of new materials and structures; on the other hand, intelligent integration will become a trend. By combining with industrial Internet and artificial intelligence technology, the whole process of welding process digital management will be realized, and intelligent factories will be built. It is foreseeable that battery pack laser welding machines will continue to play a key role in the new energy industry, helping the industry to achieve efficient intelligent manufacturing and high-quality development.