Manufacturing method of vapor chamber

A manufacturing method of a vapor chamber, the manufacturing method comprising the following steps:

• processing an upper cover and a lower cover into predetermined shapes;
• fixing a capillary structure on a surface of an inner chamber of the lower cover;
• injecting a working liquid into the capillary structure;
• and
• fixing the upper cover and the lower cover in a vacuum environment;
• wherein the step of fixing the upper cover and the lower cover in the vacuum environment comprises:
• placing the upper cover relative to the lower cover at a predetermined position;
• positioning the upper cover and the lower cover;
• and
• welding the upper cover and the lower cover;
• wherein in the step of positioning the upper cover and the lower cover, a joint between the upper cover and the lower cover is divided into a clamping area and a welding area, and the clamping area is closer to centers of the upper cover and the lower cover than the welding area;
• wherein in the step of positioning the upper cover and the lower cover, a lower clamping block of a fixture is provided with a lower limiting groove, the lower limiting groove is configured for arranging the lower cover, a side wall of the lower limiting groove abuts against a peripheral side of the lower cover, an upper clamping block of the fixture is provided with an upper limiting groove, and the upper limiting groove is configured for arranging the upper cover in an area inside the clamping area to form a matching stepped portion at the clamping area of the upper cover;
• wherein a surface of a side of the lower clamping block away from the upper clamping block is exposed outside the vacuum environment, the surface of the side exposed outside the vacuum environment is in contact with a cooling water, and the cooling water seals a gap between the lower clamping block and a box containing the vacuum environment.