Device and method for inspecting welded state

A device for inspecting a welded state between a tab, which protrudes from a plurality of electrodes stacked with a separator therebetween, and a lead welded to the tab, the device comprising:

• a pair of tab probes, including a first tab probe and a second tab probe, in contact with the tab and spaced apart from each other in a width direction of the tab;
• and
• a pair of lead probes, including a first lead probe and a second lead probe, in contact with the lead and spaced apart from each other in a width direction of the lead,
• wherein each of the pair of tab probes and the pair of lead probes include a hollow body and a shield,
• wherein each of the first and the second tab probe and the first and the second lead probe includes a pair of probe members, wherein a first probe member of each of the pairs of probe members is configured to apply a current and a second probe member of each of the pairs of probe members is configured to detect a voltage,
• wherein each of the first and second probe members has an end provided with:
• a tip configured to contact the tab or the lead and having a sharp shape;
• or
• an opposing surface configured to face the tab or the lead, and a plurality of protrusions protruding from the opposing surface to be in contact with the tab or the lead,
• wherein the pairs of probe members of the first tab probe and the second tab probe each have the end provided with the tip, and
• wherein the pairs of probe members of the first lead probe and the second lead probe each have the end provided with the opposing surface and the plurality of protrusions.