Welding inspection apparatus for inspecting a battery can

A welding inspection apparatus for inspecting a welding portion between a first electrode terminal being fixed to a closed surface of a battery can, and a first current collection plate of an electrode assembly being accommodated in a battery can, the welding inspection apparatus comprising:

• a jig configured to support the battery can such that an open part of the battery can faces in a first direction;
• and
• a camera being disposed to face the open part, the camera comprising:
• an image sensor configured to obtain an image;
• and
• a lens being disposed between the image sensor and the welding portion such that a focal point of the image concentrates on the image sensor,
• wherein the jig supports the electrode assembly such that a central axis of the electrode assembly is parallel with the first direction,
• wherein the image sensor and the lens are aligned with a hollow hole part of the electrode assembly, the hollow hole part being elongated along the central axis of the electrode axis in the first direction, and
• wherein the camera is configured to extend into the battery can.