Abstract: In order to solve the disadvantages of the current mechanical positioning, a high speed vision positioning and correction system for a thin silicon wafer is proposed. The visual location algorithm gets the "master yuan" using the chain code tracking and Principal Component Analysis (PCA), on the basis of the line detection algorithm of line segment clustering, the edge line of the cell is fitted, and then the cell position and angle deviation are calculated, and finally, position and angle are corrected by using manipulator. The experimental results verify the practicability of the algorithm. In the actual production, the system can quickly and accurately locate and correct the battery, greatly increasing the efficiency and accuracy of the battery string welding.

Key words: solar cell, visual position, straight line detection, position correction