The massive surge in electric vehicle (EV) and energy storage systems has put lithium battery manufacturing at the forefront of automation. The high-precision, high-speed nature of battery production necessitates an array of specialized sensors to ensure quality and safety. 1. Thickness and Gauging (Coating Stage) During the crucial coating stage, even micron-level deviations in the electrode slurry thickness can impact battery performance and safety. Laser displacement sensors are deployed to provide continuous, non-contact measurement of the coating layer, ensuring uniformity and adherence to strict tolerance limits. 2. Presence Detection (Assembly) High-speed assembly requires perfect timing and alignment. Miniature Photoelectric Sensors and Fiber Optic Sensors are used to confirm the precise placement of separators, foils, and tabs before welding or stacking, preventing catastrophic short circuits. 3. Weld Quality Inspection (Sealing) After stacking and sealing, microscopic defects in the casing or weld can lead to leakage and failure. High-Resolution Vision Sensors are used for final quality checks, inspecting weld seams for uniformity, completeness, and alignment, ensuring a hermetic seal.