TWI487582B - A hydrogen storage device manufacturing method - Google Patents

Description

Method for manufacturing hydrogen storage device

The invention relates to a method for manufacturing a hydrogen storage device, in particular to a hydrogen storage device capable of effectively avoiding cracking of a bead to improve safety of use and effectively reducing the wall thickness of the hydrogen storage device to reduce the weight of the hydrogen storage device. Production method.

According to a set of hydrogen storage alloy tanks, in addition to the basic characteristics of the hydrogen absorption and desorption characteristics, hydrogen storage capacity, operating temperature and pressure of the alloy, it is necessary to pay attention to the alloy powder which affects the hydrogen storage rate of the hydrogen storage alloy tank. Fluidity and thermal conductivity, as well as problems related to tank deformation caused by hydrogen absorption volume expansion of alloys that affect the safety of hydrogen storage tanks.

The Republic of China Patent No. I267605 discloses a hydrogen storage device which uses a metal foil to construct a honeycomb stack to support it on a long axis, and fills its hydrogen storage alloy powder in a crucible to create a larger The reaction surface area, the expansion stress change during the process of dispersing and charging hydrogen and the effect of increasing the heat transfer effect.

However, traditionally, the internal structure of the hydrogen storage alloy is complicated, and the outer tank needs to have a structure passage and an opening. After the internal assembly, the welding is performed, the section is cumbersome, and the weld bead is partially affected by the heat affected zone and the internal phase. The change, under the high-pressure hydrogen stress cycle, produces a hydrogen embrittlement effect, which easily leads to bead cracking and hydrogen embrittlement corrosion, resulting in poor life and safety of the hydrogen storage tank.

In view of this, it is necessary to provide a manufacturing method that replaces the above process to solve the problems of poor life and safety of the hydrogen storage tank.

SUMMARY OF THE INVENTION The object of the present invention is to provide a method for manufacturing a hydrogen storage device that effectively avoids bead cracking to improve safety in use and effectively reduce the wall thickness of the hydrogen storage device to achieve weight reduction of the hydrogen storage device.

In order to achieve the above object, the present invention provides a method for manufacturing a hydrogen storage device, the steps of which include:

(1) mixing metal powder, binder and filler to obtain a tank shell feeding;

(2) mixing metal powder, salt, binder and filler to obtain a porous structure feed;

(3) feeding the shell of the can body into the injection machine to form a shell of the can body;

(4) placing the raw body of the can body in the injection machine, feeding the porous structure into the embryo of the outer shell of the can body to integrally form a porous structural embryo;

(5) soaking the shell embryo and the porous structure green embryo in water, and dissolving the salt in the porous structure embryo to form a fixed proportion of pores;

(6) removing the filler in the shell embryo and the porous structure raw embryo;

(7) High-temperature sintering of the shell embryo and the porous structure of the shell which removes the salt and removes the filler, respectively, to remove the binder in the shell embryo and the porous structure, and to dense the metal powder. The hydrogen storage device of the present invention is produced.

In summary, in the manufacturing method of the hydrogen storage device of the present invention, the can body casing is fed into the injection machine to form a shell body embryo, and then the porous structure is fed into the shell body and the embryo is integrally injection molded. A porous structure raw embryo, the hydrogen storage device thus formed is integrally formed and seamlessly joined, and various effects such as bead cracking and hydrogen embrittlement destruction can be effectively avoided, so that the wall thickness of the desired can body can be effectively thinned, In addition to significantly improving safety, it is easy to achieve the purpose of lightweighting hydrogen storage devices. In addition, the injection molding technology enables mass production and greatly reduces production costs.

100. . . Hydrogen storage device

10. . . Tank shell embryo

20. . . Porous structure embryo

201. . . Empty hole

Fig. 1 is a partially cutaway perspective view showing the embryo of the injection molded can body of the present invention.
Fig. 2 is a partially cutaway perspective view showing the injection molded porous structure green body of the present invention.
Figure 3 is a partial cross-sectional perspective view of the finished metal product after the sintering of the hydrogen storage device of the present invention is completed.
Fig. 4 is a schematic flow chart showing a method of manufacturing the hydrogen storage device of the present invention.

In order to explain in detail the technical content, structural features, goals and effects of the present invention, the following is a detailed description with reference to the drawings.

The manufacturing method of the hydrogen storage device of the present invention comprises the following steps:

(1) Mixing metal powder, binder and filler to obtain a tank casing feed.

(2) Mixing metal powder, salt, binder and filler to obtain a porous structure feed.

For the tank casing feeding, the volume percentage of the metal powder is 50-70%, the metal powder may be stainless steel or a metal alloy, and the metal alloy may be a copper alloy. In this embodiment, the metal powder is preferably stainless steel; the binder and The filler accounts for 30-50% of the total volume of the shell of the tank, and the binder accounts for 10% to 90% of the volume of the binder and the filler. The binder is mainly plastic, which can improve the shell of the shell (green embryo) Refers to the "soil embryo" that is not sintered, the embryo refers to the strength of the embryo body after dewaxing in the pre-product made of fixed mold; the filler can be wax, polyacetal (POM) or water-based material (water-soluble substance) ), the purpose is to increase the fluidity of the binder, in order to facilitate the completion of the injection molding, using the tank shell feeding, the sintered shell body embryo is a solid object, the degree of densification can reach more than 95%.

For porous structure feeding, the metal powder may be a metal or a metal alloy, wherein the metal may be copper, aluminum or titanium, the metal alloy may be a copper alloy, the metal powder and the salt account for the total porous structure feeding volume. The percentage is 50-70%, wherein the salt accounts for 20-80% by volume of the metal powder and the salt. The binder and the filler account for 30 to 50% by volume of the total porous structure, the binder is mainly plastic, and the salt can be various kinds of inexpensive and water-soluble salts which are easily obtained, such as NaC1, KC1, and MgC12. The filler for the porous structure feeding may be wax, polyacetal (POM) or water-based material (water-soluble substance), etc., in order to increase the fluidity of the binder, to facilitate the completion of injection molding, and to use the can body. The shell is fed, and the sintered shell body is a solid object, and the densification degree can reach more than 95%.

Referring to the first figure, (3) feeding the can body to the injection machine to form a can body embryo 10 .

Referring to the second figure, (4) the can outer shell embryo 10 is placed in the injection machine, and the porous structure is fed into the can outer shell green embryo 10 to integrally form a porous structural green body 20.

(5) The integrally formed can outer shell embryo 10 and the porous structural green body 20 are immersed in water, and the salts in the porous structural green body 20 are eluted to form pores 201 which are uniformly distributed and interconnected. . The volume percentage of the salt is large, and the number of the pores 201 is large, and the more easily forming the pores 201 are connected to each other; the volume percentage of the salt is small, and the pores 201 are less; the porosity of the pores 201 of the porous structure green embryo 20, The size of the hole, the ratio of the opening and closing holes, etc. can be optimally proportioned by adjusting the porous structure feeding.

(6) The filler in the can outer shell green embryo 10 and the porous structural green body 20 is removed.

When the filler in the can outer shell embryo 10 and the porous structural green body 20 is waxed, the can outer shell embryo 10 and the porous structural green body 20 are solvent-cleaned or heated to remove the can outer shell embryo 10 and The wax-based material in the porous structure green embryo 20; when the filler in the can outer shell embryo 10 and the porous structural green embryo 20 is a water-based material, the integrally formed can body shell 10 and the porous structure The raw embryo 20 is water-soaked to remove the water-based material in the can outer shell embryo 10 and the porous structural green embryo 20; when the filler in the can outer shell 10 is polyacetal (POM), it is integrated The formed can outer shell green embryo 10 and the porous structural green body 20 are subjected to nitric acid gas cracking to remove polyacetal (POM) in the can outer shell green embryo 10 and the porous structural green embryo 20.

Among them, the solvent for removing the wax-based material may be various solvents such as n-butane, n-octane, degreased oil, and bromopropane which can dissolve the wax.

(7) High temperature sintering of the can outer shell embryo 10 and the porous structural green body 20, respectively, which removes the salt and removes the filler wax, the polyacetal (POM) or the water-based material, to remove the shell outer shell 10 and the porous The hydrogen storage device 100 of the present invention can be formed by densifying the binder in the green body 20 and forming the metal powder as shown in the third figure.

Since the main component of the porous structure feeding is metal powder, after the salt is dissolved and the plastic in the binder is sintered, the porous structure is a large-area metal material, which can rapidly conduct heat and increase the efficiency of hydrogen absorption and desorption. .

In summary, in the manufacturing method of the hydrogen storage device of the present invention, the can body is fed into the injection machine to form a can body shell embryo 10, and then the porous structure is fed into the can body shell 10 The porous structure green body 20 is injection-molded, and the hydrogen storage device 100 thus formed is integrally formed and seamlessly joined, which can effectively avoid various effects such as bead cracking and hydrogen embrittlement damage, so that the desired can body can be effectively thinned. The wall thickness, in addition to significantly improving safety, is easy to achieve the purpose of lightweighting the hydrogen storage device 100. In addition, the injection molding technology enables mass production and greatly reduces production costs.

100. . . Hydrogen storage device

201. . . Empty hole

Claims (10)

A method of manufacturing a hydrogen storage device, comprising the steps of:
(1) mixing metal powder, binder and filler to obtain a tank shell feeding;
(2) mixing metal powder, salt, binder and filler to obtain a porous structure feed;
(3) feeding the shell of the can body into the injection machine to form a shell of the can body;
(4) placing the raw body of the can body in the injection machine, feeding the porous structure into the embryo of the outer shell of the can body to integrally form a porous structural embryo;
(5) soaking the shell embryo and the porous structure green embryo in water, and dissolving the salt in the porous structure embryo to form a fixed ratio of pores;
(6) removing the filler in the shell embryo and the porous structure raw embryo;
(7) High-temperature sintering of the shell embryo and the porous structure raw embryos, respectively, which removes the salt and removes the filler, to remove the binder in the shell embryo and the porous structure, and densify the metal powder. Thereby, the hydrogen storage device is fabricated. The method for manufacturing a hydrogen storage device according to claim 1, wherein the metal powder in the tank casing feed accounts for 50 to 70% by volume, and the binder and the filler occupy the total tank shell. The volume percentage is 30 to 50%, and the binder accounts for 10 to 90% by volume of the binder and the filler. The method for manufacturing a hydrogen storage device according to claim 1, wherein the metal powder in the can body casing feeding material may be stainless steel or a metal alloy, the metal alloy may be a copper alloy; the bonding agent is mainly plastic, filled. The agent may be a wax, a polyacetal or a water-based material; the filler for feeding the can outer casing may be a wax, a polyacetal or a water-based material. The method for manufacturing a hydrogen storage device according to claim 1, wherein the metal powder and the salt in the porous structure feed account for 50 to 70% by volume of the total porous structure feed, wherein The salt accounts for 20-80% by volume of the metal powder and the salt, and the binder and the filler accounts for 30-50% by volume of the total porous structure. The method for manufacturing a hydrogen storage device according to claim 1, wherein the metal powder in the porous structure feed may be a metal or a metal alloy, wherein the metal may be copper, aluminum or titanium, and the metal alloy may be Copper alloy, the adhesive is mainly plastic, the salt is a water-soluble salt, and the porous structure feeding filler can be wax, polyacetal or water-based material. The method for manufacturing a hydrogen storage device according to claim 1, wherein the porosity, the pore size, and the ratio of the opening and closing pores of the porous structure of the porous structure in the step (5) can be adjusted by adjusting the porosity. The structure is fed to the optimum ratio. The method for manufacturing a hydrogen storage device according to claim 1, wherein in the step (6), when the filler in the shell outer shell and the porous structure raw embryo is wax, the shell is The embryo and the porous structure of the embryo are washed with a solvent or heated to remove the wax-based material in the shell embryo and the porous structural embryo. The method for manufacturing a hydrogen storage device according to claim 1, wherein in the step (6), when the filler in the shell of the can body is made of a water-based material, the integrally formed can body is produced. The embryo and the porous structure of the embryo are water-soaked to remove the water-based material in the shell of the shell. The method for manufacturing a hydrogen storage device according to claim 1, wherein in the step (6), when the filler in the shell of the can body is made of polyacetal, the integrally formed can body is produced. The embryo and the porous structure of the embryo are removed by the nitric acid gas cleavage method to remove the polyacetal in the shell embryo. The method for producing a hydrogen storage device according to claim 1, wherein in the step (6), the solvent may be one of n-butane, n-octane, degreased oil or bromopropane.