High-pressure tank, method for manufacturing high-pressure tank, and method for manufacturing fiber-reinforced resin layer for high-pressure tank

A high-pressure tank, comprising:

• a liner configured to store gas;
• and
• a fiber-reinforced resin layer made of a fiber-reinforced resin and covering an outer surface of the liner, the fiber-reinforced resin layer having a first reinforcing layer covering the outer surface of the liner and a second reinforcing layer covering an outer surface of the first reinforcing layer, wherein
• the first reinforcing layer includes a cylinder member made of the fiber-reinforced resin and having fibers oriented in a circumferential direction of the cylinder member and two dome members made of the fiber-reinforced resin,
• both end portions of the cylinder member are joined to end portions of the two dome members, and
• the second reinforcing layer has fibers oriented across the two dome members.

A method for manufacturing a fiber-reinforced resin layer for a high-pressure tank including (i) a liner configured to store gas and (ii) the fiber-reinforced resin layer made of a fiber-reinforced resin and covering an outer surface of the liner, the fiber-reinforced resin layer having a first reinforcing layer covering the outer surface of the liner and a second reinforcing layer covering an outer surface of the first reinforcing layer, comprising:

• forming a cylinder member made of the fiber-reinforced resin and having fibers oriented in a circumferential direction of the cylinder member;
• forming two dome members made of the fiber-reinforced resin;
• forming a reinforcing body that is the first reinforcing layer by joining both end portions of the cylinder member and end portions of the two dome members;
• and
• forming on an outer surface of the reinforcing body the second reinforcing layer made of the fiber-reinforced resin and having fibers oriented across the two dome members.