The invention discloses a
heat exchanger which is formed by stacking laminations. Each lamination is provided with at least one
flanging hole. One side of each
flanging hole extends outwards and is higher than the surface of the corresponding lamination to form an
insertion connection part, and the other side of each
flanging hole forms a connected part. After the laminations are stacked, the
insertion connection parts of the lower laminations and the connected parts of the upper laminations are connected in a sealing mode to form pipeline space. The pipeline spaces are equivalent to inner channels of pipelines in the prior art, pipelines of a finned
heat exchanger in the prior art are omitted, the structure of the
heat exchanger is simplified, and production cost of the product can be effectively reduced. The pipeline spaces are composed of the
insertion connection parts and the connected parts on the laminations, the material of the pipeline spaces and the material of the laminations are the same, and no media exist, so that
thermal resistance is low, heat exchange efficiency can be effectively improved, and the heat exchanger has the advantages of being small in
thermal resistance, high in heat exchange efficiency, convenient to manufacture, wide in application range and the like.