Laser Cleaning Pole Piece Copper Foil Principle And Advantages

Laser Cleaning Pole Piece Copper Foil Principle and Advantages

 

Laser cleaning technology has the characteristics of high cleaning efficiency, good cleaning quality and accurate dimensional accuracy.

 

With the continuous improvement of the laser performance and the significant reduction in cost, laser cleaning technology is increasingly used in a variety of fields.

 

For example, in the lithium battery manufacturing process, before welding the lug, the coating in the area of the lug to be welded needs to be cleaned first. The main methods to remove the coating are mechanical scraping, foam adhesive and laser cleaning. Among them, mechanical scraping method is easy to damage the pole piece, and it is difficult to ensure that the coating is removed cleanly; the foam paste method has more processes, high production costs, and is not suitable for anode water-based paste.

 

Due to the advantages of laser cleaning with green, high efficiency, good cleaning effect, small damage to copper foil, laser cleaning of anode pole piece is receiving more and more attention.

 

Laser cleaning is recognized as the preferred method for removing the coating from the front and back side of lithium battery anodes, leaving the copper foil exposed for direct lug welding in the post-process.

 

The key processes that affect the quality and efficiency of laser lug cleaning include: lug alignment, laser cleaning and dust removal. When the cleaning of one position of the pole piece is completed, the next cleaning position needs to reach the laser cleaning area as soon as possible, which requires high acceleration, high speed and high accuracy of the pole piece walking belt control.

 

Laser cleaning process is the use of vibration mirror control laser beam on the cleaning area for multiple high-speed scanning filling and coating removal process. Due to the high scanning speed of the mirror during the cleaning process, the mirror and laser need to be synchronized with high-speed, real-time, high-precision control; in order to ensure cleaning efficiency and not damage the copper foil, the pulse width, power, frequency, scanning speed, line spacing and other parameters must be fully optimized for each laser cleaning. Laser cleaning off the coated material will produce a large amount of dust, so there is a need for a reasonably designed dust removal system to deal with the dust to ensure the cleaning effect, to avoid the dust escaping to pollute the workshop environment and dust removal system produces too much noise pollution consumes too much energy.

 

 

 

Laser cleaning advantages:

 

1. environmental advantages

Laser cleaning is a "green" cleaning method, without the use of any chemicals and cleaning solutions, cleaning down the waste is basically a solid powder, small size, easy to store, recyclable, no photochemical reaction, will not produce pollution. Can easily solve the problem of environmental pollution brought about by chemical cleaning. Often an extractor fan can solve the problem of waste generated by cleaning.

 

2. Effect advantage

Traditional cleaning methods are often contact cleaning, cleaning the surface of the object has a mechanical force, damage to the surface of the object or cleaning media attached to the surface of the object to be cleaned, can not be removed, resulting in secondary pollution, laser cleaning of non-abrasive and non-contact, non-thermal effect will not damage the substrate, so that these problems are solved.

 

3. Control advantages

Laser can be transmitted through optical fiber, with robot hands and robots, easy to achieve long-distance operation, can clean the traditional method is not easy to reach the part, which can ensure the safety of personnel in the use of some dangerous places.

 

4. Convenient advantage

Laser cleaning can remove various types of contaminants on the surface of various materials, to achieve the cleanliness of conventional cleaning can not be achieved. And also in the case of no damage to the surface of the material can be selectively clean the surface of the material pollutants.

 

5. Cost advantage

Laser cleaning speed, high efficiency, saving time; purchase laser cleaning system although the one-time investment is high, but the cleaning system can be long-term stable use, low operating costs, more importantly, you can easily achieve automated operation.