Fuel cell membrane humidifier

A fuel cell membrane humidifier comprising:

• a humidification module configured to humidify air supplied from an outside of the humidifier with moisture in an off-gas discharged from a fuel cell stack;
• and
• caps coupled to both ends of the humidification module, respectively,
• wherein the humidification module includes
• at least one cartridge including an inner case, a plurality of hollow fiber membranes disposed inside the inner case, and potting portions configured to fix ends of the plurality of hollow fiber membranes, the potting portions being fitted into and coupled to ends of the inner case,
• wherein at least one of the potting portions includes:
• a potting body formed to extend in a longitudinal axis of the inner case;
• a potting wing formed to extend in a lateral direction from an end of the potting body;
• and
• a potting protrusion formed to extend toward one of the ends of the inner case from the potting wing,
• wherein an end groove formed in a shape corresponding to the potting protrusion is formed at said one end of the inner case,
• wherein the potting protrusion is fitted into and coupled to the end groove, the potting wing covers said one end of the inner case, and the potting body is formed to come into surface contact with the inner case in the longitudinal axis of the inner case.