Why are cylindrical batteries such as 18650.21700 not suitable for high power laser welding machine?

Why are cylindrical batteries such as 18650.21700 not suitable for high power laser welding machine?

It is mainly due to the following reasons.

1. Difficult to control the polarity: cylindrical batteries have two extremes, usually positive and negative, and laser welding requires welding between the two electrodes. However, since the battery is small and the distance between the electrodes is very short, it is difficult to control the polarity accurately, which may lead to damage or short circuit after welding.

2. Thermal effect is difficult to control: cylindrical batteries are usually encapsulated with metal shells, so when laser welding, the heat is not easily diffused, which may lead to local overheating of the battery, thus causing danger such as combustion or explosion.

3. Safety is difficult to guarantee: The laser welding process may produce a large amount of light radiation and thermal radiation, which may cause harm to the operator's vision and health. In addition, due to the inherent danger of cylindrical batteries, if problems occur during laser welding, it may lead to serious accidents such as fire and explosion.

Therefore, to ensure the safety and quality of welding, other more suitable welding methods, such as spot welding and ultrasonic welding, are recommended. If laser welding machines must be used for welding, strict safety controls and operating specifications are required to ensure the safety of the operator and the equipment.