JPS6035437B2 - Manufacturing method of electrolytic cell - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for manufacturing a filter press type bipolar unit electrolytic cell (hereinafter simply referred to as a dew tank).

The container obtained by the present invention is generally used for electrolysis of an aqueous alkali metal chloride solution using an ion exchange membrane method.

Alkali metal chlorides, such as sodium chloride and potassium chloride, produce caustic alkali and hydrogen in the cathode compartment and chlorine in the anode compartment by diaphragm electrolysis. For this reason, the cathode chamber wall is generally made of iron so that it can withstand alkaline water, but titanium is used in the anode chamber as a material that can withstand chlorine. In addition, in order to function effectively as a bipolar electrode, in the case of a filter press type unit battery case, it is necessary to reduce the loss as much as possible between dissimilar metals such as iron and titanium, which are difficult to bond, by penetrating the back plate. and current must be passed through it.

For this reason, there are two methods: making the back plate itself entirely of iron and titanium clad, embedding a part of the back plate with iron and titanium clad, and welding the iron side of the iron titanium clad plate onto the iron back plate. Also known is a method of welding a titanium lining material to the titanium side. However, among these methods, constructing the back plate itself with a clad plate is expensive and is not without problems in processing.

In addition, the method of partially embedding the clad plate in the back plate reduces the strength of the back plate and requires a large number of manufacturing steps. Furthermore, the method of placing a clad plate on the back plate and welding it is time-consuming and creates a gap between the titanium lining material and the iron back plate, which may cause breakage in some cases. In addition, when electrolyzing alkali metals, hydrogen generated in the cathode chamber may penetrate the back plate etc. and damage the titanium lining material that makes up the anode chamber wall. ,
For example, it is effective to interpose copper or the like between iron and titanium, and from this point of view, it may be preferable to interpose metal such as steel between iron, titanium, and titanium clad plates. It also includes the case where copper or the like is interposed in the.

A feature of the present invention is that a box-shaped object made of titanium or titanium alloy, which constitutes the wall surface of the anode chamber, is connected in advance to an iron back plate by wire bonding or diffusion welding.

By doing this, first of all, it is possible not only to electrically connect both metals, iron and titanium, which are difficult to bond, but also to make the structure extremely easy, since the anode chamber wall is manufactured in a separate process in advance. can. For example, one preferable method is to press-form a titanium or titanium alloy (hereinafter simply referred to as titanium) plate using a large press-forming machine. Furthermore, a nozzle for supplying and discharging liquid to the lightning tank or a nozzle for discharging gas generated in the anode chamber may be welded in advance. In this case, the nozzle can be firmly fixed, especially since both sides of the titanium plate can be welded. Furthermore, the structure of the turtle tank is such that the back plate and the anode chamber titanium plate are almost flat and in contact over a wide area, either directly or indirectly through a steel plate, etc., so that the titanium lining plate may be damaged due to fluctuations in the tank internal pressure when the turtle tank is used. No damage caused by vibration occurs.

Furthermore, by attaching the iron parts, that is, the frame and the back plate, or by welding all the various cathode chamber side nozzles, etc., to form them in advance, and then cleaning them all at once, it is possible to eliminate processing distortions all at once. As described above, the manufacturing method of the present invention solves at once many of the drawbacks that have been a problem especially in the manufacturing of large battery containers. This will be explained below with reference to the drawings. FIG. 1 shows an iron frame and a back plate according to the present invention.

In the figure, 1 is a frame and 2 is a back plate.

In this figure, the space housing the anode chamber is placed on top and the cathode chamber is placed on the bottom. Therefore, a cathode chamber liquid discharge nozzle 3 and a hydrogen gas discharge nozzle 4 from the cathode chamber are shown. These nozzles can be used as a single unit to discharge gas in a gas-liquid phase flow, and are not limited to the illustrated nozzles. Alternatively, the nozzle may be added later. Furthermore, if desired, an anode chamber liquid discharge nozzle and a nozzle for discharging gas generated in the anode chamber (these are common A part of the frame 1 can be cut out to fit the nozzle for convenient storage after installation. FIG. 2 shows a box-like object 7 made of titanium that constitutes the wall surface of the anode chamber.

In the present invention, it is preferable to form the titanium plate into a predetermined shape by pressing, but it is of course possible to assemble the titanium plate by welding or other known methods. Further, one or all of the anode chamber liquid discharge nozzle 8, the gas discharge nozzle 9, and the salt water supply nozzle 10 may be optionally attached to the box-like object. Furthermore, the mounting position is not limited to that shown in this figure. It goes without saying that these nozzles should be positioned to fit into the cutouts 5 and 6 shown in FIG. In this figure, even the flange surface of the anode chamber is shown as an integral part, but the flange portion can also be attached by welding or the like after the box-like object and the back plate are joined. FIG. 3 is a diagram in which an anode chamber-like object is housed in the frame and back plate of FIG. 1, and the portion of the box-like object that contacts the back plate is joined by wire explosion bonding or diffusion welding.

In this figure, 11 is the joining line between the back plate and the box-like object, but this does not need to be straight. Also, it may be applied at appropriate intervals. Furthermore, the gaps between the notches 5 and 6 of the frame and the nozzle fitted therein may be left as they are, but when the dragon tank is assembled as a filter press, the tightening pressure will cause the flange of the anode chamber to If there is a possibility that the surface may cave in, it is preferable to fill the gap with epoxy resin or other resin, or to appropriately install reinforcing material 12 as partially shown in FIG.

FIG. 5 shows a cross-sectional view of the completed battery case. In other words, the anode chamber conductive rib 13 and the cathode chamber conductive rib 14 are attached to the structure shown in FIG. 3 by welding or the like. In some cases, either or one of the box-shaped objects constituting the anode chamber wall surface and the back plate may be attached before being joined.

Next, the cathode 16 is attached to the cathode lip 14, and the anode IJ bulb 11 is attached to the cathode lip 14.
An anode 15 is attached to each of the parts 3 by welding to form a dew tank of the present invention.

The most important point in the present invention is that the wall surface of the anode chamber, which has been formed into a box shape in advance, is joined to the back plate, preferably after various nozzles are also attached thereto.

Normally, iron and titanium are metals that are extremely difficult to join together.
Therefore, as mentioned above, titanium cladding is applied to the steel frame and back plate by using a separately formed iron or titanium clad plate as the back plate, applying another titanium plate to the inner surface of the frame, and welding the tangent to the clad plate. The procedure was to attach various nozzles, conductive ribs, and electrodes to the battery case, which not only made the work process complicated, but also made it difficult to detect mistakes during work. There was a drawback that this occurred. However, the present invention does not have such defects and can be easily manufactured. Furthermore, when the anode chamber nozzle is attached in advance, as shown in FIG. 6, welding can be performed from both the front and back sides of the anode chamber wall surface 7, as shown at 17 and 18, so that it can be fixed very firmly. can.

Next, the method of joining the iron back plate and the titanium box-like object according to the present invention is wire brazing or diffusion welding. According to these means, it is possible to join an iron material and a titanium material, and it is also possible to join each of iron and copper, copper and titanium, or to join them simultaneously. In other words, wire bonding or diffusion welding are known means, and these means are also employed in the present invention. Generally, iron and titanium are joined by diffusion welding.
Although the strength is relatively low, this is usually not a problem when assembled as a dew tank. Furthermore, by using iron, copper, and titanium, the bonding strength can also be increased, so it is preferable to interpose copper at least in the bonded portion. A more preferable method is to attach the wire. In this specification, the term "line attachment" includes the case where the length of the line is shortened or the length of the line is dotted.

Usually, wire impregnation is used as a lining method for steel materials, etc. However, something like a battery case requires a great deal of precision, and even though it is expected that it will deform when it adheres, it can be placed on the knee without any problems. The method of performing line image deposition is
As shown in cross section in FIG. 7, a box-like object constituting the wall surface of the anode chamber is attached, explosives 19 are appropriately set, and the explosives are detonated according to a conventional method.

In addition, as a means for effective explosive bonding, as shown in Figure 8, an embossed 2
0 and set the explosive in this embossed part. In this case, it is preferable that the height of the space between the back plate and the back plate is about 0.5 to 10 sides.

Furthermore, since the furnace tank is relatively large, there is a risk that the titanium box-like object may be distorted during explosion bonding.

In such a case, as shown in FIG. 9, it is preferable to place water 21 in a plastic bag or the like inside the box-like object in which the explosives are set. Also, when using line bridegroom,
As already explained in the case of diffusion welding, it is a preferable embodiment to overlap the steel plates at least in the joint portion to prevent hydrogen deterioration of titanium and increase the joint strength.

Also, for the conductive ribs on the anode chamber side, separate TIC is required after edging.
It can be welded, or it can be welded in advance.

Thus, by attaching an ordinary cathode to the attached cathode rib and an anode to the anode rib by an appropriate method such as welding or bolting, a turtle tank can be formed.

As mentioned above, the battery case according to the present invention not only has a low manufacturing cost because each molding, joining, and assembly process can be performed independently and can be performed easily and reliably, but also is strong enough to be used as a dew tank. It is durable and has excellent durability.

In addition, the manufacturing process itself can be shortened, as press processing becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of a frame and a back plate of a filter press type unit electrolytic cell of the present invention. FIG. 2 shows a box-shaped object made of titanium or titanium alloy that constitutes the wall surface of the anode chamber. FIG. 3 is a diagram in which a box-like object made of titanium or titanium alloy that constitutes the wall surface of the anode chamber is housed in the frame, and the back plate and the box are joined. FIG. 4 is a diagram showing one method of fixing the nozzle portion. FIG. 5 is a sectional view of the dew tank of the present invention. FIG. 6 is an example showing a method of joining the cathode chamber nozzle. FIG. 7, FIG. 8, and FIG. 9 are diagrams showing the manner in which the wire fitting is performed. In these figures, 1 is the unit electrolytic cell frame, 2 is the back plate, 3, 4, 8, 9 and 1 river nozzles, 5 and 6 are notches for fitting the anode chamber nozzle, and 7 is the anode chamber. 12 is an example of a member for fixing the nozzle; 13 is an anode conductive rib; 14 is a cathode conductive rib; 15 is an anode; 16 is a cathode; 19 is an explosive;
0 represents the embossed portion, and 21 represents water for preventing distortion. 〆／
1 Gengai 2 Kaede Kuu 12 Inferior 412 Ota Zuji G Zuji 712 Next? 'Hougaa diagram

Claims (1)

[Scope of Claims] 1. A space for accommodating a cathode chamber wall surface and an anode chamber is formed by an iron frame and a back plate, and a box-shaped object made of titanium or titanium alloy, which has been configured as an anode chamber wall surface, is formed in advance. , a filter press type bipolar unit electrolytic cell, which is housed in the anode chamber storage space and is characterized in that the back plate and a box-like object made of titanium or a titanium alloy are connected by wire explosion bonding or diffusion welding. Production method. 2. The method according to claim 1, wherein the cathode-side conductive ribs are welded in advance to the surface of the back plate that constitutes the wall surface of the cathode chamber, and then a box-shaped object made of titanium or a titanium alloy is connected. 3. The method according to claim 1, wherein the anode conductive ribs are welded in advance to a box-like object made of titanium or a titanium alloy, and then the box-like object and the back plate are connected. 4 Emboss a part of the titanium or titanium alloy box-like object in contact with the back plate with a height of about 1 to 10 mm, and apply explosives to the part where there is a space between it and the back plate. A method according to claim 1, characterized in: