A heat exchanger, comprising a core, the core comprising first plates and second plates being stacked, and the core being provided with a first fluid passage and a second fluid passage isolated from each other;
- wherein
- the core is provided with first isolation portions and second isolation portions, each of the first isolation portions is located on a corresponding first plate of the first plates, and each of the second isolation portions is located on a corresponding second plate of the second plates;
- the first isolation portion has a first welding portion, a second welding portion and a first main body portion, along a stacking direction of the core, the first main body portion is located between the first welding portion and the second welding portion;
- the first welding portion has a first welding surface, the first welding surface faces a second plate, located at one side of the first plate, of the second plates, and the first welding surface is fixed to the second isolation portion of the second plate located at the one side of the first plate by welding;
- the second welding portion has a second welding surface, the second welding surface faces another second plate, located at another side of the first plate, of the second plates, and the second welding surface is fixed to the second isolation portion of the another second plate located at the another side of the first plate by welding;
- wherein
- each of the second plates comprises a second middle portion, the second isolation portion has a third welding portion and a second main body portion;
- the third welding portion protrudes from the second middle portion along the stacking direction of the core;
- the third welding portion has a third welding surface, the third welding surface faces a corresponding first plate located at one side of the second plate, and the second welding surface is fixed to the third welding surface by welding;
- and
- the second isolation portion has a third main body portion, the second main body portion and the third main body portion are located at two sides of the third welding portion, the second main body portion and the third main body portion are at least partially opposite to each other, the first isolation portion has a fourth welding portion and a fourth main body portion, the fourth main body portion is located between the first welding portion and the fourth welding portion, the fourth main body portion and the second main body portion are at least partially opposite to each other, the fourth welding portion has a fourth welding surface, the fourth welding surface faces the adjacent second plate located at the one side of the first plate, and the fourth welding surface is fixed to the third welding surface by welding;
- and wherein
- the first welding portion has a fifth main body portion and a fifth welding portion, the fifth main body portion is located between the second main body portion and the fourth main body portion, the fifth main body portion is located between the first welding portion and the fifth welding portion, the second welding portion, the fourth welding portion and the fifth welding portion are coplanar with the first middle portion, and the fifth welding portion is located between the second welding portion and the fourth welding portion;
- the fifth welding portion has a sixth welding surface, the sixth welding surface faces the adjacent second plate located at the one side of the first plate, and the sixth welding surface is fixed to the third welding surface by welding.