Experimental and theoretical understanding of laser-material processing for composite materials

High Power Laser Cutting of Cementious Composites

Laser Spot Cutting of Spring Contact Probe for semiconductor inspection

High Speed Remote Laser Cutting of Electrodes for Lithium-ion Batteries

From the manufacturing process of lithium ion cells, several problems have been reported during the cutting process. Currently, die cutting and rotary knife slitting have been used to cut the prismatic and cylindrical electrodes, respectively. Both techniques require relatively expensive tooling that wears over time. This tool wear results in process instability and requires additional cost and downtime to replace the worn tools. Furthermore, redesign of mechanical cutting processes demanding extra expenses is an inevitable step, since cell specifications vary depending on applications such as electronic devices and electric vehicles. The most significant disadvantage due to the tool wear is the problem of inconsistent cut surfaces with defects, which are characterized by burrs, delamination, edge bending, and micro-sized material attachments. These defects cause the penetration of the separator giving rise to internal short circuits. Moreover, the quality of a poor cut surface makes electrodes susceptible to higher electrical stress, which can lead to significant heat generation and possible thermal runaway. Internal short circuits and significant heat generation can eventually result in catastrophic failures of the entire system. The abovementioned problems can be solved by using laser cutting, which is proven and widely utilized in industry as well as is a high efficient and reliable manufacturing method. It has many advantages, such as no tool wear due to the contact- free process, high energy concentration, low noise level, fast processing speed, very narrow Heat Affected Zone (HAZ), applicability to nearly all materials, and flexibility of laser power. Most importantly, laser cutting is relatively easily applicable to different cell specifications with less cost, since redesign of laser cutting processes is relatively simple and cheap compared to mechanical cutting processes.

Advanced design for manufacturing processes

Laser direct writing for tissue engineering and medical devices

Development of self De/Anti-icing surface using laser surface treatment and piezoelectric element

Rotorcraft position control