锂电极片切割进入绿光时代

Core Viewpoint - High-power pulsed fiber green laser has gradually become the preferred solution for high-precision cutting of lithium battery electrode sheets after three years of industrial application advancement [1][4]. Group 1: Lithium Battery Market Demand - The lithium battery industry in China has achieved rapid development over the past 15 years, growing from less than 2 GWh to over 2000 GWh [6][7]. - The industry has produced several leading global players and showcased China's strong industrial capabilities and continuous technological innovation [7][8]. Group 2: Development of Cutting Technology - The cutting technology for lithium battery electrode sheets has evolved from traditional blade cutting to laser cutting, with recent advancements moving towards short-wavelength and ultrafast laser applications [3][9]. - The current cutting process requires high-power, high-beam quality infrared nanosecond lasers, but there is a pressing need for technological iteration to reduce burrs and molten beads, which can lead to safety issues [9][10]. Group 3: Advantages of Green Laser Cutting - Green laser cutting offers better performance due to its high absorption rate in metals like copper and aluminum, resulting in higher energy density and better cutting quality compared to infrared lasers [11][12]. - The green laser cutting process has shown significant advantages in various battery types, including cylindrical, stacked, and prismatic batteries [12]. Group 4: Performance Comparison - In cutting negative electrode sheets, green laser cutting achieves a cutting efficiency of 150 m/min with a burr size of 0-5 μm and a production yield exceeding 99.99%, compared to infrared's 90 m/min and 5-10 μm burr size [42][43]. - The green laser's cutting depth is ±1.0 mm, while infrared only achieves ±0.3 mm, enhancing cutting stability and yield [42][43]. Group 5: Application in Positive Electrode Cutting - Green laser technology also shows superior potential in cutting positive electrode materials, particularly in ceramic layers, reducing burr size and thermal impact, which positively affects battery safety [50][51]. Group 6: Commercialization of Green Laser Technology - The high-power green laser technology has been successfully adopted by several leading manufacturers in the lithium battery electrode sheet cutting field, marking a significant step towards precision, efficiency, and reliability in the industry [53].