Humidifier, in particular for a fuel cell

A humidified capable of humidifying air for a fuel cell, comprising:

• at least one stack unit including a plurality of membranes permeable to water vapor in which each membrane is arranged one above the other and spaced apart from one another;
• a plurality of enclosing parts, each enclosing part secured onto a membrane edge of a respective one of the plurality of membranes, each enclosing part having:
• a flat contacting region arranged laterally outwardly from the membrane edge;
• a profile section connected to the contacting region and arranged perpendicularly between the membrane edge and the contacting region;
• a first foil connected to the profile section, the first foil resting directly on and extending on and fixedly connected to a first side of the respective one of the plurality of membranes;
• and
• a second foil connected to the profile section and resting directly on and extending on and fixedly connected to an opposite second side of the respective one of the plurality of membranes, such that the membrane edge is sandwiched between the first and second foil;
• wherein the membrane edge is enclosed at least in sections, by the foils of the enclosing part;
• and
• wherein the membrane edge of a first membrane of the plurality of membranes is fixedly connected to a first enclosing part of the plurality of enclosing parts;
• wherein the membrane edge of an immediately adjacent second membrane of the plurality of membranes is fixedly connected to a second enclosing part of the plurality of enclosing parts;
• wherein a connecting region of the first connecting part is fixedly directly connected onto the connecting region of the second connecting part, forming a flow-tight connection;
• wherein the connecting regions of the first connecting part and the second connecting part are arranged between membrane planes of the first membrane and the second membrane.