WELDMENT INSPECTION METHOD OF POWER STORAGE DEVICE, AND WELDMENT INSPECTION EQUIPMENT OF POWER STORAGE DEVICE

摘要

To provide a weldment inspection method and weldment inspection equipment of a power storage device, capable of inspecting the bonding state at the weld zone of the case body and a lid precisely.SOLUTION: An inspection method of a secondary battery having a weld zone 50 on the continuous surface 11a of the sidewall 32 of the case and a lid 14 includes a step of placing a secondary battery so that the continuous surface 11a inclines with an inclination angle θ for the direction of the continuous surface 11a extending along the lateral face 63 of a tabular reference plate 60, a step of measuring a first distance X of the lateral face 63 of the tabular reference plate 60 and the corner 14d of the lid 14, in the direction along the top face 61 of the reference plate 60, a step of irradiating an X-ray in the direction along the lateral face 63 of the reference plate 60, and acquiring the perspective images of the reference plate 60 and the weld zone 50, a step of measuring a second distance Y of the lateral face 63 of the reference plate 60, and a void 51 contained in the weld zone 50 from the brilliance of the perspective images, and a step of calculating the penetration amount A of the weld zone 50, on the basis of the first distance X, the second distance Y, the thickness T of the lid 14, and the angle value θ.SELECTED DRAWING: Figure 5