JP6028007B2 - Electrolytic cell manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing an electrolytic cell.

Conventionally, titanium or the like is used on the anode side and nickel or the like is used on the anode side in the constituent members of the alkaline water electrolysis tank by the salt electrolysis method or the like. More recently, nickel is used on the anode side and nickel on the cathode side of the electrolytic cell used for hydrogen production in alkaline water electrolysis utilizing regenerative energy and the like.
For example, in an electrolytic cell having an ion exchange membrane, a thin nickel plate (1), a thin nickel (2), and a thin nickel plate (3) are arranged in this order toward the ion exchange membrane. There has been proposed an electrolytic cell in which the caustic chamber is formed in a very thin thickness by using a caustic frame chamber (Patent Document 1).

JP 2000-282278 A

  By the way, it is very difficult to weld a nickel plate or the like, and even TIG (Tungsten Inert Gas) welding often causes a hot crack in the welded part, which causes leakage. In addition, human resources capable of welding nickel plates are limited, and reduction of man-hours is a problem. For this reason, in order to mass-produce the alkaline water electrolysis hydrogen production apparatus provided with such an electrolytic cell, it is necessary to consider the efficiency of welding.

  In addition, the bipolar ion exchange membrane electrolytic cell in the case of salt electrolysis used titanium on the anode side, nickel and stainless steel on the cathode side, but used titanium clad (explosion-bonded product of titanium and SS400) on the partition wall. However, since welding on the nickel side employs a resistance welder and the welding conditions are very severe, the resistance welded portion was cracked or SS400 was involved, and it was not always perfect. In addition, it takes time for maintenance, such as adhesion of deposits to the spot gun of a resistance welder, which has hindered cost increases and mass production.

  An object of the present invention is to provide a method of manufacturing an electrolytic cell that improves the efficiency of welding and enables mass production of the electrolytic cell.

(1) When bonding the constituent members of the rib, pan and partition in the process of manufacturing and assembling the electrolytic cell,
In the assembled state in which at least two components of the rib, the pan, and the partition wall are stacked, lap welding is performed by a laser welding method ,
In the electrolytic cell, the rib and the pan are disposed on the cathode side and the anode side, respectively, across the partition wall,
The electrolyzed cells that have been temporarily assembled are arranged vertically rather than in a planar arrangement, and the cathode side and the anode side are simultaneously overlap-welded by two laser welding apparatuses that perform welding by laser welding. How to make an electrolytic cell.

According to the invention of (1), since welding is carried out by a laser welding method in an assembled state in which at least two members of ribs, pans and partition walls in the process of manufacturing and assembling the electrolytic cell are stacked, resistance is increased. The efficiency of welding can be improved as compared with the case of welding with a welding machine.
Therefore, it is possible to provide a method for manufacturing an electrolytic cell that improves the efficiency of welding and enables mass production of the electrolytic cell.
In addition, ribs and pans arranged on the cathode side and the anode side, respectively, across the partition wall are welded simultaneously on the cathode side and the anode side by two laser welding devices, further increasing the efficiency of welding. Can be achieved.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing efficiency of an electrolytic cell which aims at efficiency of welding and enables mass production of an electrolytic cell can be provided.

It is a perspective view of the component member 100 in the alkaline water electrolysis tank welded with the manufacturing method of the electrolysis tank concerning the embodiment of the present invention. It is a figure explaining the manufacturing method of the electrolytic cell which concerns on the Example of 1st Embodiment. It is a figure explaining the manufacturing method of the electrolytic cell which concerns on the Example of 1st Embodiment. It is a figure explaining the manufacturing method of the electrolytic cell which concerns on the Example of 2nd Embodiment. It is a macro cross-sectional photograph after the welding by the Example of 2nd Embodiment.

Hereinafter, although embodiment of this invention is described, this invention is not limited to this. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
First, the structure of the structural member in the alkaline water electrolytic cell welded by the electrolytic cell manufacturing method according to the embodiment will be described with reference to the drawings.
FIG. 1 is a perspective view of a component member 100 in an alkaline water electrolysis tank that is welded by an electrolytic cell manufacturing method according to an embodiment of the present invention.

  The component member 100 includes an anode rib 1 that is a 1.5 mm thick nickel plate, an anode pan 2 that is a 1 mm thick nickel plate, a partition wall 3 that is a 3 mm thick nickel material, and an anode pan on the opposite surface of the partition wall 3. The cathode pan 4 and the anode rib 1 of the same material and the same thickness as the cathode rib 5 are assembled, and all of them are bonded by fiber laser welding.

  Specifically, in the process of manufacturing and assembling the electrolytic cell, when the constituent members 100 of the anode rib 1 and the anode pan 2, the partition wall 3, the cathode pan 4 and the cathode rib 5 are bonded, at least two of them are used. The component members 100 are stacked and welded by the laser welding method with the assembled state.

[First Embodiment]
The electrolytic cell of the first embodiment is manufactured by laminating the two layers of the pan (anode pan 2 or cathode pan 4) and the partition wall 3 in the assembled state by laser welding, and then rib (anode). The two layers of the rib 1 or the anode rib 1) and the lap welded pan (the anode pan 2 or the cathode pan 4) are stacked and integrated by laser welding in the assembled state.

(Example)
An example of the anode side will be described with respect to the electrolytic cell manufacturing method of the first embodiment.
2 and 3 are diagrams for explaining a method of manufacturing an electrolytic cell according to an example of the first embodiment.
In the manufacturing method of the electrolytic cell according to the example of the first embodiment, the anode rib 1, the anode pan 2, and the partition 3 are welded in two steps.

First, as shown in the cross-sectional view of FIG. 2, the overlap bonding welding of the anode pan 2 and the partition wall 3 was performed from the anode pan 2 side under the fiber laser welding conditions shown in A of Table 1 shown below.
Fiber laser: Condensing lens F0: F = 200: 200
Fiber diameter and processing point diameter: 0.3mm / 0.3mm
Under the above-mentioned fiber laser welding conditions, it was possible to realize an appropriate lap adhesive 6 having a weld bead width of 2.2 mm on the surface, a depth of 0.8 mm, and a penetration depth of 3.1 mm.

Next, as shown in the cross-sectional view of FIG. 3, the anode rib 1 is disposed, and the overlap bonding welding of the anode rib 1 and the anode pan 2 welded to the partition wall 3 by overlap bonding is performed from the anode rib 1 side. It implemented on the fiber laser welding conditions shown to B of Table 1 shown in these.
Under the above-mentioned fiber laser welding conditions, it was possible to realize a good overlap adhesion 7 with a weld bead width of 2.0 mm on the surface layer, a depth of 0.7 mm, and a penetration depth of 2.0 mm.

  On the other hand, the same procedure and conditions as those on the anode side were also performed on the cathode side, and all of the components 100 (see FIG. 1) could be bonded.

[Second Embodiment]
The manufacturing method of the electrolytic cell of the second embodiment is a laser welding method in an assembled state in which three layers of a rib (anode rib 1 or anode rib 1), a pan (anode pan 2 or cathode pan 4) and a partition wall 3 are stacked. Are integrated by lap welding.

(Example)
An example of the anode side will be described with respect to the method for manufacturing the electrolytic cell of the second embodiment.
FIG. 4 is a diagram for explaining an electrolytic cell manufacturing method according to an example of the second embodiment.
In the method of manufacturing an electrolytic cell according to the example of the first embodiment, three anode ribs 1, an anode pan 2, and a partition wall 3 are stacked and bonded.

As shown in the sectional view of FIG. 4, penetration bonding welding of the anode rib 1, the anode pan 2, and the partition wall 3 was performed from the anode rib 1 side under the fiber laser welding conditions shown in Table 2 below.
Fiber laser: Condensing lens F0: F = 200: 200
Fiber diameter and processing point diameter: 0.3mm / 0.3mm
Under the above-mentioned fiber laser welding conditions, it was possible to realize appropriate overlap bonding 8 with a weld bead width of 3.3 mm on the surface, a depth of 1 mm, and a penetration depth of 4.3 mm.
FIG. 5 is a macro sectional photograph after welding according to an example of the second embodiment.

  On the other hand, the same procedure and conditions as those on the anode side were also performed on the cathode side, and all of the components 100 (see FIG. 1) could be bonded.

[Third Embodiment]
As shown in FIG. 1, the electrolytic cell manufacturing method of the third embodiment is provided with an anode rib 1 and an anode pan 2, a partition wall 3, and a cathode pan 4 and a cathode rib 5 on the opposite surface of the partition wall 3. The assembled electrolytic cell is placed vertically rather than in a plane, and two laser welding devices that perform welding by the laser welding method are used on the cathode side under the same fiber laser welding conditions as in the example of the second embodiment. And the anode side are overlapped and welded simultaneously.

According to the method for manufacturing an electrolytic cell according to the above-described embodiment, the following effects can be obtained.
According to the laser welding method of the nickel plate of the above embodiment, the rib of the nickel plate and the pan of the nickel plate are arranged in contrast on the B side (cathode side) across the partition wall on the A side (anode side). The A side and the B side are completely integrated by laser welding.
By providing the partition of the nickel plate, the strength against the differential pressure is increased and welding of the same nickel is performed, so the welding distortion is not great.

  It is almost impossible to integrate the A side (anode side) and B side (cathode side) using a conventional resistance welder. It becomes the product without. Also, two nickel plates (for example, anode pan 2 and partition 3 on the anode side, anode rib 1 and anode pan 2, and cathode pan 4 and partition 3 on the cathode side, cathode rib 5 and cathode pan 4) One side may be laser-welded in two steps, or three nickel plates (for example, anode rib 1, anode pan 2, and partition wall 3) may be joined once by joining so that there is no gap between nickel. Laser welding can also be performed.

  In addition, by fixing the position of ribs and pans, pans and bulkheads in advance by spot welding, and pressing them with a jig for preventing displacement, the ribs and bulkheads can be more accurately arranged at equal pitches. it can.

  In addition, the partition of the nickel plate is arranged at equal intervals with the rib across the A side and B side ribs and the pan, and the partition of the nickel plate is equal to the thickness of the rib of the nickel plate and the pan of the nickel plate It is desirable to keep it thick or thick. As a matter of course, it is desirable that the laser welding on the A side and the B side should not overlap.

  In the third embodiment, the electrolytic cell as a product is placed vertically, and the A side and the B side are simultaneously welded by two laser welders, and the construction is performed in consideration of the arrangement so that distortion does not occur. Therefore, high quality and mass production can be expected.

  According to the method for manufacturing an electrolytic cell according to the above-described embodiment, a stable operation can be performed even at a high current density of 100 A / dm 2, and a single electrode type and a bipolar electrode electrolytic cell having a low electrolysis voltage can be provided.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

  For example, in the third embodiment, it is desirable to use two laser welders to make the product electrolytic cell a vertical type and simultaneously perform laser welding on the A side and the B side. It is also possible to perform laser welding one by one. In that case, it is desirable to apply reverse distortion so that welding distortion does not occur.

DESCRIPTION OF SYMBOLS 1 Anode rib 2 Anode pan 3 Partition 4 Cathode pan 5 Cathode rib 6,7,8 Overlaying part 100 Constituent member

Claims (1)

When bonding the components of ribs, pans and partition walls in the process of manufacturing and assembling the electrolytic cell,
In the assembled state in which at least two components of the rib, the pan, and the partition wall are stacked, lap welding is performed by a laser welding method ,
In the electrolytic cell, the rib and the pan are disposed on the cathode side and the anode side, respectively, across the partition wall,
The electrolyzed cells that have been temporarily assembled are arranged vertically rather than in a planar arrangement, and the cathode side and the anode side are simultaneously overlap-welded by two laser welding apparatuses that perform welding by laser welding. How to make an electrolytic cell.