Ultra-thin heat pipe and manufacturing method of the same

A method, comprising:

• arranging a first wick structure and a second wick structure in a metal pipe;
• flattening the metal pipe to obtain a heat dissipating device having
• a first plate;
• and
• a second plate opposite the first plate, wherein longitudinally extending ends of the first plate and the second plate are connected to each other by sidewalls, the first plate, the second plate and the sidewalls enclose an internal space of the heat dissipating device, and the first plate forms a top horizontal surface of the internal space, the second plate forms a bottom horizontal surface of the internal space, and each sidewall forms side surfaces of the internal space;
• sealing a first longitudinal end of the heat dissipating device to form a first transitional portion of the first plate that is sloped towards the second plate and connects to a first extended end of the second plate at the first longitudinal end;
• inserting a working pipe in the heat dissipating device via an opening at a second longitudinal end thereof;
• sealing the second longitudinal end of the heat dissipating device up to the working pipe;
• inserting working fluid in the internal space of the heat dissipating device via the working pipe;
• sealing an entire width of the heat dissipating device at a first location adjacent to the second longitudinal end to form a second transitional portion of the first plate that is sloped towards the second plate and connects to a second extended end of the second plate at the second longitudinal end;
• and
• removing excessive portions of the working pipe and the heat dissipating device at or adjacent to the second transitional portion away from the first longitudinal end,
• wherein the first wick structure and the second wick structure extend an entire length of the heat dissipating device and is absent in the first transitional portion and the second transitional portion.