Analysis of laser cutting of lithium-ion power battery pole piece

In order to meet the demand of lithium-ion battery industry, and to seek a high-efficiency and high-quality cutting method, the cutting quality by various lasers are investigated. Comparing with the image measuring instrument and SEM, it is found that the burr and heat-affected zone(HAZ) of aluminum foil cut by Q-type 1 064 nm fiber laser with 100 ns pulse width are about 15 μm and 60 μm, and the HAZ of negative copper foil is about 200 μm, the burr and HAZ of aluminum foil cut by MOPA fiber laser with 20 ns pulse width are 10 μm and 20 μm, respectively, and the HAZ of copper foil is about 70 μm. The burr and HAZ of aluminum foil cut by 10 picoseconds pulsed solid laser are about 6 μm and 10 μm separately, a zone of no melting and re-condensation is achieved when copper foil is cut. The HAZ of aluminum foil are about 10 μm and 17 μm respectively when they are cut by 355 nm UV and 532 nm green solid lasers with 20 ns pulsed width. However, the HAZ are more than 70 μm and 100 μm when cutting copper foil. The experimental results show that the narrower the pulse width and the higher the repetition frequency, the better the cutting quality of pole piece. The PS laser cuts the pole piece with the highest precision and the best quality, which is the most ideal laser for cutting the pole piece. At present, the MOPA fiber laser with high frequency and relatively narrow pulse width has the highest cutting speed, and the cut positive electrode piece fully meets the industrial requirements, and is more suitable for the industrial promotion of the pole piece cutting.