Meaning
Non-contact metrology techniques for battery manufacturing measure the surface topography and dimensional accuracy of electrodes or cell casings using reflected light beams. The procedure known as a laser profile scan generates high-resolution three-dimensional maps of the target surface to detect sub-millimetre variations in thickness and flatness. Quality control teams use this process to monitor the consistency of the electrode coating before the cell is assembled.
The measurement is executed inline during the roll-to-roll manufacturing process to enable real-time adjustments.
Measurement Mechanism
Laser diodes project a structured line of light onto the moving electrode web while a high-speed camera captures the deformation of the reflected line. This optical system calculates the distance to the surface at thousands of points across the width of the coating. The software processes this data to reconstruct the surface profile of the active material.
This continuous measurement detects defects like pinholes, agglomerates, and coating edge anomalies. The speed of the scanning system allows for complete coverage of the production line. This throughput is necessary for industrial scaling.
Defect Detection
Variations in the thickness of the active material layer can cause uneven current distribution and localized lithium plating during cell operation. Identifying these variations early in the production process allows operators to reject defective sections of the electrode before calendering.
Production Quality
Quality records compile the scanning results to provide a traceable history of the mechanical dimensions of each cell batch. Sourcing teams review these reports to verify the manufacturing capabilities of potential cell suppliers. A narrow distribution of thickness measurements indicates a high level of process control and supplier reliability.
This verification helps buyers choose partners that can deliver consistent cell performance over large production runs. The scanning technology ensures the delivery of high-quality components.
