Non-destructive inspection method for pouch-type battery

A non-destructive inspection method for inspecting a pouch-type secondary battery during a manufacturing process of the pouch-type secondary battery, wherein the process includes an electrode tab pre-welding process for pre-welding and aligning a plurality of electrode tabs extended from an electrode assembly;

• an electrode tab main-welding process for main-welding and connecting an electrode lead to the pre-welded electrode tabs;
• and a packing process for packing the electrode tabs and the electrode assembly into a pouch, the non-destructive inspection method comprising:
• a first crack condition inspecting operation to inspect a first crack condition of the electrode tabs by measuring the first crack condition of the electrode tabs, which occurs in the electrode tab pre-welding process, and comparing a measured first crack-condition measurement signal and a first crack-condition reference signal, wherein the first crack condition inspecting operation is performed after the electrode tab pre-welding process;
• a second crack condition inspecting operation to inspect a second crack condition of the electrode tabs by measuring a second crack condition of the electrode tabs, which occurs in the electrode tab main-welding process, and comparing a measured second crack-condition measurement signal and a second crack-condition reference signal, wherein the second crack condition inspecting operation is performed after the electrode tab main-welding process;
• and
• a weld condition inspecting operation to inspect a weld condition of the electrode tabs by measuring a weld condition of the electrode tabs, and comparing a measured weld-condition measurement signal and a weld-condition reference signal, wherein the weld condition inspecting operation is performed after the electrode tab main-welding process.