Heat exchanger

A heat exchanger, comprising

• a case body, and
• a heat exchange core accommodated in the case body, wherein:
• a first fluid channel is formed in the case body, a second fluid channel is formed in the heat exchange core, and the first fluid channel and the second fluid channel are isolated from each other, the heat exchange core comprises one or more flat pipes, the second fluid channel is located in the flat pipe, and the flat pipe comprises at least one first bending portion, at least one second bending portion and a plurality of flat straight portions, the first bending portion and the second bending portion are located at two opposite sides of the heat exchange core respectively, the adjacent two flat straight portions are roughly parallel with each other and keeps a distance of 0.5 mm to 6 mm from each other;
• the case body is provided with an opening in communication with a space close to the first bending portion, a projection of the first bending portion and/or a part of the flat straight portions close to the first bending portion in a direction of an inner wall of the case body is at least partially coincident with the opening;
• and
• the case body is provided with an opening in communication with a space close to the second bending portion, a projection of the second bending portion and/or a part of the flat straight portions close to the second bending portion in a direction of an inner wall of the case body is at least partially coincident with the opening.