The disadvantages of ultrasonic metal welding are also obvious:

1. Batch welding speed is slow, the welding route is uncontrollable and cannot be refined;

2. The welding strength and quality uniformity is poor;

3. compared with laser, its power consumption and production cost is larger;

4. Laser welding machine.

Laser welding is highly efficient and easy to realize automated production. After continuously improving the welding process and limiting the thermal impact during the molding process, it is increasingly used in actual production. Laser welding combined with industrial robots is gradually becoming the main force in automated power battery module production lines.

Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Laser welding is mainly used to weld thin-walled materials and low-speed welding. The laser welding process is a heat conduction type, that is, the laser radiation heats the surface of the work piece and the surface heat passes through Heat conduction diffuses to the inside, and by controlling parameters such as laser pulse width, energy, peak power, and repetition frequency, the work piece is melted to form a specific molten pool. Laser welding can be achieved using continuous or pulsed laser beams. The principles of laser welding can be divided into heat conduction welding and laser deep penetration welding. When the power density is less than 104~105W/cm2, it is heat conduction welding. At this time, the penetration depth is shallow and the welding speed is slow; when the power density is greater than 105~107W/cm2, the metal surface is concave into "holes" due to heat, forming deep penetration welding, which has a high welding speed. Fast and large aspect ratio.

Through the comparison of various welding methods of battery module bus, it can be seen that laser welding is still the preferred technology for battery welding. With the continuous update and development of automation and intelligent technology, the laser welding power battery process will also become more refined and intelligent. , including battery loading, testing, welding, quality monitoring, traceability, assembly and unloading, the entire intelligent production line is more diversified and is an important part of the dust-free workshop and smart factory!