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DE-102022115812-B4 - High-pressure tank and manufacturing process for it

DE102022115812B4DE 102022115812 B4DE102022115812 B4DE 102022115812B4DE-102022115812-B4

Abstract

High-pressure tank (1), comprising: an assembly (10) comprising a pipe section body (11) and two dome sections (12, 13) which are joined together; and a spiral layer formed outside the assembly (10), wherein the pipe body (11) has a pipe lining (21) and a pipe reinforcement layer (31) which covers an outer circumferential surface of the pipe lining (21), wherein each of the dome body sections (12, 13) has a dome lining (22, 23) and a dome reinforcement layer (32, 33) which covers an outer circumferential surface of the dome lining (22, 23), and wherein the pipe section body (11) and the two dome section bodies (12, 13) are assembled such that the dome lining (22, 23) is arranged in an outer section of the high-pressure tank (1) relative to the pipe lining (21), characterized by the fact that an end section of the pipe lining (21) is a folded end section (211) which is folded back to an outside of the high-pressure tank (1); and the folded end section (211) of the tube lining (21) in a composite area of the tube part body (11) and each of the dome part bodies (12, 13) is in contact with the dome lining (22, 23).

Inventors

  • Hironori Nakamura
  • Koji Katano
  • Daisuke Satoya
  • Takuya Kobayashi

Assignees

  • TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date
20260513
Application Date
20220624
Priority Date
20210708

Claims (6)

  1. High-pressure tank (1), comprising: an assembly (10) with a tube body (11) and two dome bodies (12, 13) which are joined together; and a spiral layer formed outside the assembly (10), wherein the tube body (11) has a tube lining (21) and a tube reinforcement layer (31) which forms an outer circumferential surface of the tube lining (21) covered, wherein each of the dome part bodies (12, 13) has a dome lining (22, 23) and a dome reinforcement layer (32, 33) covering an outer circumferential surface of the dome lining (22, 23), and wherein the tube part body (11) and the two dome part bodies (12, 13) are assembled such that the dome lining (22, 23) is arranged in an outer section of the high-pressure tank (1) relative to the tube lining (21), characterized in that an end section of the tube lining (21) is a folded end section (211) which is folded back to an outside of the high-pressure tank (1); and the folded end section (211) of the tube lining (21) is in a composite area of the tube part body (11) and each of the dome part bodies (12, 13) is in contact with the dome lining (22, 23).
  2. High-pressure tank (1) after Claim 1 , wherein: the spiral layer has a high spiral layer (34) designed to cover at least the tube part body (11), and an outer spiral layer (35) formed outside the high spiral layer (34); and the high spiral layer (34) extends over a part of each of the dome part bodies (12, 13) over a composite area of the tube part body (11) and each of the dome part bodies (12, 13).
  3. A method for manufacturing a high-pressure tank (1) comprising an assembly (10) with a tube body (11) and two dome bodies (12, 13) which are joined together, and a spiral layer formed outside the assembly (10), the method comprising: a part-body formation process for forming the tube body (11) with a tube lining (21) and a tube reinforcement layer (31) covering an outer circumferential surface of the tube lining (21), and the dome bodies (12, 13) each with a dome lining (22, 23) and a dome reinforcement layer (32, 33) covering an outer circumferential surface of the dome lining (22, 23); an assembly process for forming the assembly (10) by joining the tube body (11) and the two dome bodies (12, 13); and a spiral layer formation process for forming the spiral layer outside the assembly (10), wherein in the assembly process the tube part body (11) and the two dome part bodies (12, 13) are assembled such that the dome lining (22, 23) is arranged in an outer section of the high-pressure tank (1) relative to the tube lining (21), characterized in that an end section of the tube lining (21) is a folded end section (211) which is folded back to an outside of the high-pressure tank (1); and the folded end section (211) of the tube lining (21) is in a composite area of the tube part body (11) and each of the dome part bodies (12, 13) is in contact with the dome lining (22, 23).
  4. Procedure according to Claim 3 , wherein during the assembly process the pipe part body (11) is pressed into each of the dome part bodies (12, 13) such that the dome lining (22, 23) touches the pipe reinforcement layer (31) without touching the pipe lining (21).
  5. Procedure according to Claim 3 or 4 , wherein: the spiral layer formation process comprises a high spiral layer formation process for forming a high spiral layer (34) covering at least the tube part body (11), and an outer spiral layer formation process for forming an outer spiral layer (35) outside the high spiral layer (34); and in the high spiral layer formation process the high spiral layer (34) is formed such that it covers the tube part body (11) and extends over a portion of each of the dome part bodies (12, 13) over a composite area of the tube part body (11) and each of the dome part bodies (12, 13).
  6. Procedure according to one of the Claims 3 until 5 , further comprising a sealing test process for testing the sealing performance of the assembly (10) between the assembly process and the spiral layer formation process, wherein a negative pressure is applied to the interior of the assembly (10) during the sealing test process.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention The invention relates to a high-pressure tank and a method for manufacturing the high-pressure tank. 2. Description of the state of the art A high-pressure tank is known for installation in a fuel cell electric vehicle or the like, comprising a lining with a cylindrical pipe section and a pair of domed sections formed at axially opposite ends of the pipe section, and a reinforcing layer of fiber-reinforced resin covering an outer circumferential surface of the lining. The high-pressure tank with this structure is manufactured by first forming the lining and then forming the reinforcing layer by winding resin-impregnated fiber bundles around the outer circumferential surface of the lining using a fiber winding process (FW process), with the formed lining serving as the winding core (see, for example, the Japanese patent application). JP 2012- 149 739 A A high-pressure tank according to the preamble of claim 1 and a corresponding method for manufacturing a high-pressure tank according to the preamble of claim 3 are the subject of the subsequently published DE 10 2021 100 879 A1 . Regarding the state of the art, reference is also made to the following: JP 2017 - 48 912 A as well as the US 2010 / 0 276 434 A1 referred. SUMMARY OF THE INVENTION Recently, an alternative manufacturing process to the one described above has been considered. This process involves using a mold to produce partial bodies of a reinforcing layer, and these partial bodies are then arranged on the outside of a separately manufactured liner. However, this method does not readily allow for the production of a high-pressure tank, as precise dimensional matching between the liner and the partial bodies of the reinforcing layer is required. The invention aims to create a high-pressure tank that can be manufactured easily and a method for manufacturing the high-pressure tank. A high-pressure tank according to a first aspect of the invention comprises an assembly with a tube body and two dome bodies, which are joined together, as well as a spiral layer or helical layer formed outside the assembly. The tube body has a tube lining and a tube reinforcement layer covering an outer circumferential surface of the tube lining, and each of the dome bodies has a dome lining and a dome reinforcement layer covering an outer circumferential surface of the dome lining. The tube body and the two dome bodies are joined together such that the dome lining is arranged in an outer section of the high-pressure tank relative to the tube lining. In the high-pressure tank as described in the first aspect, the tube section body has the tube lining and the tube reinforcement layer covering the outer circumferential surface of the tube lining, and each of the dome sections has the dome lining and the dome reinforcement layer covering the outer circumferential surface of the dome lining. The tube section body and the two dome sections are assembled such that the dome lining is located in the outer section of the high-pressure tank relative to the tube lining. Thus, the lining can be formed simply by assembling the dome sections and the tube section body, which simplifies the manufacture of the high-pressure tank. An end section of the tube lining is a folded end section that is folded back towards the outside of the high-pressure tank. This folded end section of the tube lining is located within a composite area of the tube body, and each of the dome body sections is in contact with the dome lining. This arrangement ensures the sealing performance of the liner formed by the tube lining and the dome linings. In the high-pressure tank according to the first aspect, the spiral lining can have a high spiral layer configured to cover at least the tube body, and an outer spiral layer formed outside the high spiral layer. The high spiral layer can extend over a portion of each of the dome bodies, beyond a combined area of the tube body and each dome body. This arrangement allows the tube lining and dome lining to be kept in contact, and deformation in the combined area of the tube body and dome body can be reduced. As a result, the sealing performance of the high-pressure tank is improved. A method for manufacturing a high-pressure tank according to a second aspect of the invention. The process involves the manufacture of a high-pressure tank comprising an assembly with a tube body and two dome bodies, which are joined together, as well as a helical layer formed outside the assembly. The process includes a part-body formation process for forming the tube body with a tube lining and a tube reinforcement layer covering an outer circumferential surface of the tube lining, and the dome body with a dome lining and a dome reinforcement layer covering an outer circumferential surface of the dome lining; an assembly process for forming the assembly by joining the tube body and the two dome bodies; and a helical layer formation process