Apparatus for inspecting fatigue fracture of housing welding part of battery module

A fatigue failure verification device comprising:

• a module housing comprising a welding portion;
• a cell stack comprising a plurality of battery cells accommodated in the module housing;
• at least one main flexible tube located in a central portion of the cell stack in a stack direction of the cell stack;
• a main flexible tube frame in which the at least one main flexible tube is accommodated, the main flexible tube frame comprising a pair of opening portions formed on opposite sides so that the at least one main flexible tube faces the plurality of battery cells;
• and
• a pump configured to adjust a pressure applied by the at least one main flexible tube to the plurality of battery cells by supplying a fluid to the at least one main flexible tube,
• wherein the main flexible tube frame surrounds an outer periphery of the at least one main flexible tube so as to limit a volume expansion direction of the at least one main flexible tube to only the stack direction of the cell stack,
• wherein the at least one main flexible tube is housed in surface contact with an inner peripheral surface of the main flexible tube frame along a length of the inner peripheral surface of the main flexible tube frame in the stack direction of the cell stack, and
• wherein the inner peripheral surface of the main flexible tube frame is a planar surface that extends continuously from one of the pair of opening portions to another of the pair of opening portions in the stack direction of the cell stack.