Laser Cleaning Applications for Batteries

Cleaning for bonding

   

Laser cleaning is extremely useful for battery parts that require bonding preparation. Today’s EV manufacturing processes involve an increasing number of adhesives, sealants, pastes, potting components, gap fillers, and encapsulants. They are used to add thermal, structural, sealing and damping features to the battery. By removing contaminants before bonding or treating batteries, it improves the chemical properties that hold the pieces together and expands the lifespan of the EV battery. With new structural battery technologies, the bonding quality is even more critical as it is now part of the safety of the vehicle.

Laser cleaning is the best surface preparation solution recommended by the most important adhesive manufacturers. Cleaning zones can be positioned in a very flexible manner for a wide range of part sizes and shapes, allowing very efficient cleaning at high production rates.

 

Cleaning for electrical contact

Electrical contact

Laser cleaning is a quick and precise technology used to remove coatings and contaminants like varnish, epoxy, oil, and other coating on battery busbars, motor winding terminals, and other inductors.

 

Cleaning for welding

Cleaning for welding    

In battery packs, there are hundreds or even thousands of welds on the cells and structure. Busbars, cell tabs, and other various electrical connections are all critical for the good operation of the battery. Laser cleaning guarantees that every single weld (ultrasonic or otherwise) is perfect, optimizing the quality of the electrical contact and the overall weld strength.

 

21700 cylindrical cell cleaning area example

Laser cleaning times for different number of cells

Cycle time (sec)
Number of cells  30W  50W  100W  200W 
120 11.5–13.0 8.5—10.0 6.2—7.7 5.1—6.6
240 23.1–26.1 17.0—20.0 12.4—15.4 10.1—13.1
480 46.1—52.1 34.0—40.0 24.8—30.8 20.3—26.3
960 92.2—104.2 67.9—79.9 49.7—61.7 40.6—52.6

Water contact angle test results

The water contact angle is a standard, proven test to validate surface cleanliness. Our tests demonstrate outstanding cleaning results.

 

Cleaned Metal - Low Contact Angle Contaminated Metal - High Contact Angle

 

Water Contact Angle Definition Laser Cleaning Level Achieved
Water Contact Angle Definition Laser Cleaning Level Achieved

Water contact angle over time after laser cleaning

 

Download the technical paper