Welding detection apparatus and welding detection method

A welding detection apparatus for detecting a weld seam between a case and a top cover of a battery, the detection apparatus comprising:

• an image acquisition component configured to shoot the weld seam, the image acquisition component being located obliquely above an outer side of the weld seam and forming an included angle with a height direction of the battery;
• and
• a processor configured to obtain a protruding height of the weld seam relative to a reference surface area on an outer side wall of the case according to a first distance between the image acquisition component and the outer side wall of the case, a second distance between the image acquisition component and the weld seam, and the included angle, and compare the protruding height with a preset height threshold to determine whether the protruding height of the weld seam is qualified;
• and configured to establish at least one plane parallel to the outer side wall of the case in an image to intersect with the weld seam to obtain an intersecting line which is a contour line of a surface of the weld seam, perform linear fitting on at least three points on the intersecting line to obtain a spatial straight line, calculate a distance between each of the at least three points and the spatial straight line, and compare the distance with a preset distance threshold to determine whether an appearance defect exists in the weld seam.