Device and method for inspecting welded state for cylindrical secondary battery

Abstract

A device for inspecting a welded state of a plurality of welded portions coupling a non-coating portion of an electrode to an electrode tab includes a resistance measurer having a plurality of resistance measurement probes which respectively measure resistance values of the plurality of welded portions; and a resistance inspector which compares each of the resistance values of the plurality of welded portions, with a critical resistance value. When the resistance value of at least one welded portion among the plurality of welded portions exceeds the critical resistance value, the at least one welded portion is determined as having a weak welding. The plurality of resistance measurement probes respectively measure the resistance values of the plurality of welded portions while being respectively in contact with a non-welding surface disposed between the plurality of welded portions and non-welding surfaces outside outermost welded portions of the plurality of welded portions.

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