Laser Cleaning in Lithium Battery Assembly Enhancing Quality and Reliability

1. Laser Cleaning in Lithium Battery Assembly: Enhancing Quality and Reliability Introduction In the highly demanding world of lithium battery assembly, achieving superior quality and reliability is essential. Among various critical processes, laser cleaning has emerged as a groundbreaking solution, particularly in sealing nail welding. This advanced cleaning technique effectively removes contaminants without harming the battery structure. Let's explore how laser cleaning works and why it’s transforming lithium battery production. 1.Understanding the Laser Cleaning Process The Limitations of Traditional Methods Conventional methods like solvent cleaning and ultrasonic cleaning have drawbacks. Solvent cleaning often fails to remove residual electrolytes, while ultrasonic cleaning can damage sensitive components. Why Laser Cleaning Is Superior? Laser cleaning uses precisely tuned lasers to remove surface contaminants through processes like laser ablation. This involves focusing a laser beam to vaporize or sublimate impurities, ensuring a clean surface without physical damage.

2. •Laser Ablation: A key process where pulsed lasers remove material. The efficiency depends on factors such as laser wavelength and pulse duration. •Ablation Rate: Determined by the mass removed per pulse, influenced by scanning speed and line coverage. 2. Applications in Lithium Battery Assembly Improving Welding Quality In lithium battery manufacturing, especially for cleaning liquid injection ports made from aluminium substrates, laser cleaning is crucial. It removes contaminants like electrolytes and DMC, preventing defects such as welding fry points and black spots. Key Benefits: •Enhances weld quality •Increases production yields •Reduces welding defects 3. Crucial Laser Cleaning Parameters •Laser Energy Density This must balance between the cleaning threshold (minimum energy to remove

3. pollutants) and the damage threshold. Ideal settings are typically around 80% of the damage threshold. •Laser Wavelength Shorter wavelengths improve absorption rates, enhancing cleaning efficiency. The choice of wavelength depends on the substrate and contaminant type. •Pulse Width Affects the thermal diffusion depth. Shorter pulses provide more efficient cleaning by concentrating energy. •Number of Pulses Increasing pulses enhances cleaning efficiency but reaches a point of diminishing returns. •Laser Incident Angle Optimizing the incident angle ensures that laser beams reach all contaminants, even those hidden in difficult spots. Conclusion Laser cleaning is revolutionizing lithium battery assembly by providing a precise, efficient, and damage-free method for removing contaminants. Understanding parameters such as laser energy density, pulse width, and incident angle is crucial for achieving optimal results. As laser technology advances, its role in enhancing battery production standards and performance will continue to grow, setting new benchmarks for the industry.