Heat exchanger

A heat exchanger, comprising:

• a plurality of flat tubes, spaced from each other along a width direction of the flat tubes, wherein a fluid channel is arranged in each of the flat tubes and extends along a length direction of the flat tubes, and each of the flat tubes has two main surfaces opposite along a thickness direction of the flat tubes and has two side surfaces opposite along the width direction of the flat tubes;
• and
• a plurality of fins arranged between adjacent flat tubes in the thickness direction of the flat tubes and spaced apart from each other in the width direction of the flat tubes, and each of the plurality of fins extends along the length direction of the flat tubes and is provided with a ventilation window,
• wherein:
• at least a first fin of the plurality of fins comprises a flat sheet and a positioning flange, wherein the flat sheet extends along the thickness direction of the flat tubes and has two opposite side edges along the thickness direction of the flat tube;
• the positioning flange of the first fin is connected to one of the two side edges of the flat sheet of the first fin and extends towards an adjacent fin of the plurality of fins;
• a plurality of openings are arranged in the positioning flange along the length direction of the flat tubes, and the first fin forms a depression at each opening of the positioning flange, a depth of the depression being not less than a thickness of the positioning flange.