TW515879B - Method of manufacturing hydrogen fuel canister - Google Patents

Abstract

Disclosed is a method of manufacturing hydrogen fuel canister, comprising the steps of: extruding an aluminum ingot to form a hollow cylinder having an opening; filling the hollow cylinder with hydrogen storage alloy to increase hydrogen content; securing a metal cap to the opening of the hollow cylinder by electromagnetic pulse forming technique so as to completely seal the canister and to provide the canister with sufficient mechanical strength.

Description

515879 V. Description of the invention (l) The present invention relates to a method for manufacturing a hydrogen fuel tank, and particularly relates to a method for sealing a hydrogen fuel tank by means of electromagnetic pulse forming (electromagnetic pulse '' f om r i n g). Fuel cells use hydrogen and oxygen to generate water to convert chemical energy into electricity. The required oxygen can be taken directly from the air, but the hydrogen required for portable fuel cells usually requires Pure hydrogen tank. Fig. 1A is a partial cross-sectional view of a conventional hydrogen fuel tank. As shown in Fig. 丨 A, the conventional hydrogen fuel tank 10 has a hollow cylinder and a metal cap 12, and the hollow cylinder 11 has a The open end 丨 3 and a closed end 丨 丨 i have a protruding portion 112 at the closed end 11 for setting a safety valve 14; and a metal top cover 12 for sealing the open end 113 of the hollow cylinder u to make the hollow The cylinder 丨 丨 forms a hollow sealed cavity. The metal top cover 12 also has a protruding part 2 for setting a vent valve 3 so that the hydrogen fuel tank 1 can be easily inserted and used. In general, the joining method of metal steel cylinders is usually carried out by welding. However, in order to meet the requirements of weight reduction and height of hydrogen fuel tanks for portable fuel cells, the material used is mainly aluminum alloy. Figure 丨 β is a schematic diagram of the welding bead of the metal cap of the hydrogen tank, as shown in Figure 1A and Figure 1B. When welding, the metal cap 12 must be placed in the hollow cylinder 11 first, and the hollow circle ^ 11 There is a flange 114 at the open end 113, which is used to support the metal top cover. Because of the low temperature of aluminum and gold, it is difficult to weld, and it is easy to produce bubbles or covered oxide defects within 15 during welding. 51. The structural strength of the hydrogen fuel tank and 10 is greatly reduced. When pressurizing the tank gas in the hydrogen fuel, the hydrogen gas may easily leak and cause danger. ^ Lice

0760-8079TWF (N); Jimmy.ptd Page 4 515879 V. Description of the invention (2) In view of this, the object of the present invention is to provide a simple and safe hydrogen fuel tank manufacturing method, so that the hydrogen fuel tank is sealed During operation, the processing time is short, and no high heat is generated, which will deteriorate the internal hydrogen storage alloy and affect the quality of the hydrogen fuel tank. To achieve the above object, the present invention provides a method for manufacturing a hydrogen fuel tank, which includes the following steps: providing a metal ingot, forming a hollow cylinder with an opening from the metal ingot, filling a hollow cylinder with a hydrogen storage alloy, and then using electromagnetic pulses Forming fixedly seals a metal top cover on the open end of the hollow cylinder. In a preferred embodiment, the hollow cylinder is formed by extrusion and heat treatment; a flange is formed at the open end of the hollow cylinder, and it can carry a metal top cover when it is subjected to electromagnetic pulse forming. In a preferred embodiment, a first through hole is formed in the center of the closed end of the hollow cylinder to provide a safety valve, and a second through hole is formed in the center of the metal top cover to provide a vent valve. In a preferred embodiment, the material of the hollow cylinder and the metal cap is an aluminum alloy. In a preferred embodiment, the hydrogen storage alloy is one of a magnesium nickel alloy, a lanthanum nickel alloy, or an iron titanium alloy. In a preferred embodiment, the side surface of the metal top cover has an inclination angle, so that the open end of the hollow cylinder is retracted after being formed by electromagnetic pulse, and fits on the side surface of the metal top cover. In addition, a plurality of annular grooves are formed on the side of the metal top cover, and an adhesive is filled in the annular groove between the metal top cover and the hollow cylinder and the metal top cover to prevent the gas in the hydrogen fuel tank from leaking out. .

0760-8079TWF (N); Jimmy.ptd Page 5 515879 Description of the invention (3) The epoxy resin is the preferred embodiment of the adhesive. Figure 2 is a flowchart of the method for manufacturing a tritium fuel tank according to the present invention. First, a metal ingot is provided, and the metal ingot is extruded to form a hollow cylinder with one end as an opening and subjected to heat treatment (S200), and a flange is formed at the open end of the hollow cylinder by cutting = work (S200); The closed end of the hollow cylinder is formed in the center — a first through hole, and a screw is tapped in the first through hole to install a safety valve (S203), and then the hollow cylinder is filled with a hydrogen storage alloy to increase the slag tank. The hydrogen storage capacity (S204). Next, a metal top cover is provided, the outer diameter of which is equal to the inner diameter of the hollow cylinder, and an inclination angle (S205) is cut on the side of the metal top cover to form in the center of the metal top— The second through hole also taps the screw thread in the second through hole to install a vent valve (S206); several annular grooves are formed on the side of the metal top cover (S207); before the sealing operation, First fill the inner edge of the open end of the middle 1 cylinder and the annular groove of the metal top cover with epoxy resin (S208), and then place the metal top cover on the flange of the open end of the hollow cylinder (S209); Electromagnetic pulse forming (electromagnetic magnetic form) method At the open end of the hollow cylinder (S210); then install a safety valve in the first through hole (S2n), place the valve in the second through hole (S212), and complete the manufacture of the hydrogen fuel tank. Only by The hydrogen fuel tank manufactured by the above method is shown in FIG. 3, please refer to FIG. 3A. FIG. 3 is a cross-sectional view of the hydrogen fuel tank of the present invention. ^ Includes-a hollow cylinder 21, a metal cover 22, and a ventilation. Valve ㈡,-safety dagger 24 and a convenient grip 25, and hydrogen storage is arranged in the hollow cylinder

0760-8079TWF (N); Jimmy.ptd Page 6 515879 V. Description of the invention (4) Alloy 263 and its bearing structure. As shown in FIG. 3, the hollow cylinder 21 has a closed end 2ΐι 钿 2 1 3 ′ at the center of the closed end 2 1 1 with a protruding portion 2 1 2 and a through hole 2121. The through hole 2121 and the protruding portion The outer edge of the part 212 is equipped with a safety valve 24 and a handle 25 respectively; this safety valve 24 has a preset pressure when the hydrogen pressure inside the hydrogen fuel tank 20 is too high. Danger. 262 and one inside is provided with a partition plate 264, a plurality of partition plates-gold Hi; 1, the partition plate 264 and the partition plate 262 are used to separate the hydrogen storage " ^ θ knife into several areas, so that the hydrogen storage alloy 263 Not easy to break due to shaking " 261 ^ Λ to do hydrogenation embers & solid 1 to g road. In addition, the hydrogen storage alloy 263 uses the amount of TΓ, and generally uses nitrogen from lanthanum alloy and iron-titanium alloy pools; tank 2◦ the use of iron-titanium alloy is more suitable for portable fuel electrical caps 22: m is shown in the hollow cylinder 21 The open end 213 is-metal top _ 'and also has a convex thread and-in the through hole 2211. A two-way valve 23 is provided with a valve member 231 and -ϋ 通 = valve 23. When it is pushed back, hydrogen fuel The tank 20 is stored in Xinxin II, Tian valve parts 231 for battery use, and after 5 | 232%, the lice will leak out, providing 10% of the end of the fuel to escape; ί; =. Preventing alloy powder in gas fuel tanks Due to the hollow circle of the rat fuel tank 2 0 alloy, the high temperature of the dazzling point of Ming alloy =: 2:22 The material is not easy to dry and easy to produce defects,

515879 V. Description of the invention (5) Second, the invention < manufacturing method is a column 2 formed by electromagnetic pulse and the metal cover 22 can be quickly combined, and has a sufficient 4A picture for the schematic diagram of the electromagnetic fuel forming of a hydrogen fuel tank , Middle: the open end 213 has a flange 2131 for receiving the metal top cover; 2 the side 222 of the metal top 盍 22 and the open end 21 3 the tube wall forms a tilt and has several annular grooves on the side 222 2 221, can be used for O-rings for angle ^ 'or filled with adhesive. Taking this embodiment as an example, before the magnetic pulse forming of the magnetic field, the open end 213 of the metal top cover 22 and the hollow cylinder 21 is filled with adhesive 27, and the annular groove 2221 is filled with an adhesive 27 to prevent hydrogen from leaking out. , And the adhesive 27 is preferably epoxy resin. As shown in FIG. 4A, when the electromagnetic pulse forming is performed, the coil 30 of the electromagnetic pulse shape machine can generate an external current of thousands of amperes in a few milliseconds. The coil current direction is vertically upward; the opening in the hollow cylinder 21 The terminal 213 will also induce an opposing induced current 32, and its direction is also upward. Because the external current 31 of the coil 30 and the induced current 32 of the open end 213 each generate a strong mutually exclusive magnetic field, the tube of the open end 213 of the hollow cylinder 21 will be pushed inward by a great force and fit on the Metal cover 22

On the side surface 222, the open end 213 is tightly combined with the metal top cover 22. As shown in FIG. 4B, after the hydrogen fuel tank is formed, the excess adhesive 2 7 ′ filled between the metal top cover 22 and the open end 21 3 will be extruded, and the adhesive in the annular groove 2 2 2 丨 will be adhered. Agent 27 will solidify to ensure that the hydrogen in the hydrogen fuel tank will not leak out. In addition, in the manufacturing method of the hydrogen fuel tank of the present invention, the closed end 211 of the hydrogen fuel tank can also be implemented by a combination method such as the open end 213 and the metal top cover 22.

0760-8O7QTWP, M .. T immv. Ntrl Page 8 515879 V. Description of the invention (6) Application of electromagnetic pulse forming to combine a metal base with a diameter slightly smaller than a hollow cylinder to either end of the hollow cylinder with two openings at both ends, The steps of the above embodiment are performed again, and the hydrogen fuel tank in the embodiment of the present invention is also manufactured. With the above-mentioned manufacturing method of the hydrogen fuel tank 20, the sealing operation of the hydrogen fuel tank 20 can be simply and safely performed. On the one hand, it does not generate high heat during welding, and the internal hydrogen storage alloy 2 6 3 is deteriorated, or This causes a problem of insufficient strength and affects the quality of the hydrogen fuel tank 20; on the other hand, its short processing time and low manufacturing cost make it very suitable for mass production manufacturing requirements. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application.

0760-8079TWF (N); J immy.ptd Page 9 515879 The diagram is briefly explained. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is provided below in cooperation with The attached drawings are described in detail as follows: Brief description of the drawings: Figure 1A is a partial cross-sectional view of a conventional hydrogen fuel tank. Fig. 1B is a schematic diagram of welding of the metal top cover of a conventional hydrogen fuel tank. Fig. 2 is a flowchart of a method for manufacturing a hydrogen fuel tank according to the present invention. Fig. 3 is a sectional view of a thorium fuel tank according to the present invention. Fig. 4A is a schematic diagram when the hydrogen fuel tank of the present invention is subjected to electromagnetic pulse forming. FIG. 4B is a schematic diagram after the hydrogen fuel tank of the present invention is formed. Explanation of symbols: 1 0 ~ known hydrogen fuel tank 1 hollow cylinder 1 11 ~ closed end 1 12 ~ protruded part 11 3 ~ open end 1 14 ~ flange 1 2 ~ metal top cover 121 ~ protruded part 1 3 ~ Vent valve 14 ~ Safety valve 1 5 ~ Weld bead 151 ~ Defect 2 0 ~ Hydrogen fuel tank 2 Hollow cylinder 2 1 Bl closed end 212 ~ Projection 2 1 2 1 ~ Through hole 213 ~ Open end 2 1 3 1 ~ Flange 22 ~ metal top cover

0760-8079TWF (N); Jimmy.ptd Page 10 515879 Brief description of the drawing 2 2 1 ~ protrusion 2 2 1 1 ~ through hole 2 2 2 ~ side 2 2 2 1 ~ ring groove 2 3 ~ vent valve 2 3 1 ~ valve 2 3 2 ~ filter 2 4 ~ safety valve 2 5 ~ caba hand 2 6 1 ~ gas collection tube 2 6 2 ~ separation plate 263 ~ hydrogen storage alloy 2 6 4 ~ separator 2 7 ~ Adhesive 3 0 to coil 3 1 to external current 3 2 to induced current A to enlarged area

0760-8079TWF (N); J immy.ptd Page 11

Claims (1)

515879 VI. Scope of patent application 1. A hydrogen fuel tank system to provide a medium six circle Z includes the following steps: end; u, the hollow cylinder has a closed end and an open storage; the hollow cylinder is filled with hydrogen storage Alloy to increase the size outside the hydrogen fuel tank; ^ ^ two 忒 metal tops have one side, and outside the metal top, t is outside the hollow cylinder's inner diameter; and = ΐ magnetic pulse forming (electr 〇magnetic puise f〇rming) Fix the ~ 5 genus top cover to the open end of the hollow cylinder. 2. The method for manufacturing a hydrogen fuel tank as described in item 1 of the scope of the patent application, wherein the hollow cylinder is formed by extruding a metal ingot and forming it by heat treatment. 3. The manufacturer / knowledge of the hydrogen fuel tank as described in item 2 of the scope of the patent application, wherein the hollow cylinder and the top cover are made of aluminum alloy. According to the manufacturer of the hydrogen fuel tank described in item 丨 of the scope of the patent application / wherein the hydrogen storage alloy is a lanthanum nickel alloy. # 沬, 5. Manufacture of lice fuel tank as described in item 1 of the scope of patent application, wherein the hydrogen storage alloy is an iron-titanium alloy. _% d method, 6. If the manufacturer of the lice fuel tank described in item i of the patent application scope, the manufacturer is a magnesium-nickel alloy. The hydrogen method, as described in item 1 of Shen Qing's patent scope, further includes the following steps: It is used to carry the metal cap when the open end of the hollow cylinder is formed by punching. Win flange 0760-8079TWF (N); J immy.ptd The scope of the patent application 8. The manufacturing method of the hydrogen fuel tank of φ ten sets > which further includes the following steps described in item 1 of the τ second scope and includes the following steps: Set one :: In the closed end of the empty round branch Code formation-the first through-hole, to set the hydrogen fuel tank manufacturing method described in item 1 of the patent application scope, and, including the following steps: valve. Formed in the center of the metal top cover, a second through hole 'set-aeration and the hydrogen fuel tank manufacturing method described in item 1 of the scope of patent application, end in electromagnetic pulse forming: shrink 11. As described in the first scope of patent application The hydrogen fuel tank manufacturing method according to item 〇, further comprising the following steps: forming a plurality of rings on the side of the side metal cap 2 = the hollow circle and the "concave = vent ^ mouth" of the metal cap Agent or O-ring to prevent the gas inside the hydrogen fuel tank 1 2. The hydrogen fuel tank side as described in item 丨 丨 of the patent application scope, the adhesive in the eighth is epoxy resin.: The two! ！ The side of f has an oblique = making the hollow cylinder fit the metal top cover Page 13