Boss assembly, gas storage container, and boss assembly manufacturing method

A gas storage container comprising:

• a liner having an opening provided on one side along a longitudinal axis;
• and
• a boss assembly coupled to the opening of the liner, wherein the boss assembly includes:
• a main body made of a metal material, having a first gas inlet/outlet extending along the longitudinal axis;
• a flange member made of a resin material, coupled to the main body, having a second gas inlet/outlet arranged on the longitudinal axis to communicate with the first gas inlet/outlet and a flange coupling portion joined to the liner;
• and
• a concave-convex engagement portion including an interlocking groove formed in an arc shape on the main body and an interlocking rib, formed on the flange member, inserted into and engaged with the interlocking groove.

A method for manufacturing a boss assembly coupled to an opening of a liner of a gas storage container along a longitudinal axis of the gas storage container, the method comprising:

• forming a main body by processing a metal to have a first gas inlet/outlet extending along the longitudinal axis;
• preheating the main body at a temperature range of 140° C. to 160° C. and placing the preheated main body into an injection cavity of a mold;
• and
• injecting a resin into the injection cavity of the mold to form a flange member, which is coupled to the main body and has a second gas inlet/outlet arranged on the longitudinal axis to communicate with the first gas inlet/outlet.