Heat exchanger and assembly method therefor

A heat exchanger, comprising a housing and a core body accommodated in the housing, wherein the housing comprises a first body and a second body, the first body is made of metal, the second body is made of plastic, and the first body and the second body are connected to form a first cavity;

• the core body is accommodated in the first cavity, the core body is fixedly connected to the first body, the core body comprises a plurality of heat exchange pipes, the plurality of heat exchange pipes are stacked, a first fluid passage is formed between the plurality of heat exchange pipes, a second fluid passage is formed inside the plurality of heat exchange pipes, and the first fluid passage is not in communication with the second fluid passage;
• the heat exchanger further comprises a connecting block, the connecting block is fixedly arranged on a side of the first body away from the core body and fixed to the first body and the connecting block is located outside the housing, the connecting block and the core body are arranged on two opposite sides of the first body of the housing, respectively, a first flow-through hole is provided in the connecting block, a second flow-through hole is provided in the first body, and the first flow-through hole and the second fluid passage are in fluid communication through the second flow-through hole,
• wherein the core body comprises a collecting pipe, the second flow-through hole is in communication with the plurality of heat exchange pipes through the collecting pipe, a protruding portion, which extends from the second flow-through hole toward a side where the core body is located, is provided at a side of the first body opposite to the connecting block, and the protruding portion extends into the collecting pipe through an opening of the collecting pipe when the first body is assembled with the core body,
• wherein an outer wall of the protruding portion in contact with the collecting pipe is provided with a solder composite layer, the protruding portion is welded to an inner side wall of the collecting pipe by the solder composite layer.