JP3307630B2 - Electrode plate for water electrolysis device, electrode plate unit and electrolysis cell - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electrode plate for a water electrolysis apparatus, an electrode plate unit, and an electrolytic cell. More specifically, the present invention relates to an electrode plate and an electrode plate unit used in a water electrolysis device such as a hydrogen oxygen generator that generates oxygen gas or hydrogen gas by electrolyzing water, and an electrolytic cell using the electrode plate unit.

[0002]

2. Description of the Related Art Conventionally, a hydrogen oxygen generator has been disclosed in
As disclosed in JP-A-239788, an electrolytic cell for performing electrolysis of water, which is a central function thereof, is incorporated. The electrolytic cell is obtained by arranging a predetermined set of solid electrolyte membrane units. The solid electrolyte membrane unit has electrode plates on both sides of the solid electrolyte membrane, and one of the spaces sandwiched therebetween serves as an anode chamber serving as an oxygen generation chamber, and the other serves as a cathode chamber serving as a hydrogen generation chamber. Each chamber accommodates a porous power supply.

[0003] In the case of a bipolar electrolytic cell, when a DC voltage is applied between the electrode plates at both ends of the aligned solid electrolyte membrane units, those end electrode plates become a monopolar electrode of an anode and a cathode, respectively. And an intermediate electrode plate is a bipolar electrode plate in which one surface is an anode and the other surface is a cathode. That is, the space between each solid electrolyte membrane and the anode side of the electrode plate is an anode chamber, and the space between each solid electrolyte membrane and the cathode side of the electrode plate is a cathode chamber.

For example, in an electrolytic cell 51 shown in FIG. 6, 52 is a bipolar electrode plate (see FIG. 7) arranged in the middle, and 53a and 53b are end electrode electrodes arranged at the end, respectively. It is a plate, so to speak, a monopolar electrode plate. Reference numeral 54 denotes a solid electrolyte membrane, and reference numeral 55 denotes a porous power supply. Reference numeral 56 denotes an annular gasket made of a silicone rubber plate for isolating the porous power supply 55 from the outside. 57 is an annular protection sheet. Reference numeral 58 denotes an oxygen gas take-out path, 58a denotes an oxygen gas flow path, 61 denotes a drain water discharge path for the cathode chamber, and 61a denotes a drain water discharge path. Although the pure water supply path 60, the pure water circulation path 60a, the hydrogen gas extraction path 59, and the hydrogen gas circulation path 59a are not shown in this drawing, as apparent from FIG. It is formed by the same configuration as the gas extraction path 58 and the oxygen gas flow path 58a. In FIG. 6, both end plates are denoted by reference numeral 62, and both end plates 6 are tightened by fastening bolts not shown.
The electrolytic cell 51 is assembled by penetrating the two through an electrode plate or the like and tightening them at a portion corresponding to the outer periphery, that is, a gasket portion in this drawing.

[0005] The porous feeder is formed of a gas-permeable material such as a mesh or a sintered body, and a fluid can freely flow from the side thereof.

The conventional electrode plate 52 is a simple flat plate.
In the electrode plate 52, the passages 58a, 59a for the respective fluids are provided.
Since it is necessary to form the gasket seats for the passages 60a and 61a, and further, to form gasket seats for the respective passages, a thick titanium plate is used.

As described above, the conventional electrolytic cell uses a simple flat electrode plate made of a thick titanium plate. Since such an electrode plate does not have elasticity, the seal between the oxygen generation chamber and the hydrogen generation chamber and the outside depends on the elasticity of the gasket laminated on the electrode plate.
Therefore, when tightening the bolt at the time of assembling the electrolytic cell, it is necessary to sufficiently tighten the bolt to exert the sealing function of the gasket. On the other hand, in the conventional electrolytic cell shown in FIG. 6, since the gasket is merely laminated on a simple flat electrode plate, if the gasket is tightened too strongly, the gasket is deformed outward and inward. There is a possibility that it will protrude. Such deformation of the gasket tends to cause creep deterioration. In particular, during the operation of the device, the temperature of the device itself increases due to heat generated during water electrolysis, and thus the creep deterioration of the gasket tends to be accelerated. Therefore, it is necessary to retighten the fastening bolts to compensate for the creep deterioration. However, if the retightening is performed, further creep deterioration is caused, and it is difficult to maintain the seal surface pressure constant. .

Further, the oxygen generation chamber and the hydrogen generation chamber are
During operation of the electrolytic cell, the pressure increases due to the generated oxygen and hydrogen gas. As described above, in the conventional electrolytic cell, since the soft gasket is merely laminated on the flat electrode plate, the gasket moves out of the cell as the internal pressures of the oxygen generation chamber and the hydrogen generation chamber increase. There is a risk of protruding. Therefore, there is also a problem that the conventional electrolytic cell cannot withstand high-pressure use that generates high-pressure oxygen or hydrogen gas.

Further, the gasket has a much higher coefficient of thermal expansion than other parts. As described above, in the conventional electrolytic cell, an electrode plate made of a thick titanium plate is used, and since the electrode plate itself does not have elasticity, the thermal expansion of the gasket is consequently tightened by the fastening bolt. This can lead to increased forces, which can cause various problems in the electrolytic cell.

[0010] By the way, since the electrode plate needs to maintain a good contact state with the adjacent porous feeder, high flatness and parallelism are required on both surfaces thereof. However, as described above, a thick titanium plate is usually manufactured by hot rolling, and thus has poor flatness and parallelism, and further flattening is required for use as an electrode plate.

In this regard, an electrode plate has been proposed which combines a plurality of thin metal plates and has a function equivalent to that of a single conventional electrode plate (see Japanese Patent Application Laid-Open No. 9-263982). Since the metal plate is used as one electrode plate, the contact electric resistance during use is large, and the supply voltage required for operation is increased. As a result, there is a problem that energy efficiency during operation is reduced.

The present invention has been made to solve such a problem, and an object of the present invention is to provide an electrode plate that can be easily manufactured from a thin metal plate and that improves the pressure resistance of an electrolytic cell. Another object of the present invention is to provide an electrode plate capable of improving the pressure resistance of an electrolytic cell and maintaining a high sealing effect of a gasket. It is another object of the present invention to provide an electrolytic cell in which the pressure resistance is improved, a high sealing effect of the gasket is maintained, and the assembly is easy.

[0013]

The electrode plate of the present invention is formed of a metal plate, and has a flat plate portion, a concave portion and a convex portion which are located outside the plate portion and extend along the outer peripheral edge. And a peripheral portion bent so as to be alternately aligned.

Therefore, a plurality of the electrode plates of the present invention are stacked so that the projection of one electrode plate and the recess of another electrode plate adjacent to the one electrode plate are in contact with each other. If an electrolysis cell is formed, even if an electrode plate made of a thin metal plate is used, it has a strong peripheral side wall due to the uneven contact, and the pressure resistance is improved. In addition, since the electrode plates constituting the electrolytic cell have effective elasticity, in such an electrolytic cell, each electrode plate can absorb an increase in tightening surface pressure due to thermal expansion.

Furthermore, when compared with an electrode plate formed by laminating a plurality of thin metal plates, there is no problem such as a voltage loss at a contact portion between the electrode plates. Reduction is prevented.

It is preferable to employ a metal plate having a thickness that can be press-molded, since an electrode plate having concave portions and convex portions can be easily and inexpensively manufactured.

[0017] Preferably, a groove for a sealing member along the peripheral portion can be formed between the plate portion and the peripheral portion of the electrode plate by bending. According to such a configuration, since the seal member fitted into the groove is tightened more than necessary and does not deform into an unreasonable shape,
Creep deterioration of the seal member is effectively prevented, and as a result, a high sealing effect is maintained.

[0018] More preferably, if the plate portion is configured to be located substantially at the center of the width of the electrode plate defined by the bottom of the concave portion and the top of the convex portion, both sides of the plate portion are preferably provided. When assembling the water electrolysis apparatus such that a space for the oxygen generation chamber and a space for the hydrogen generation chamber are formed respectively, it is easy to arrange necessary parts such as a power supply body in the space for the oxygen generation chamber and the space for the hydrogen generation chamber. . Also, it is possible to prevent these parts from being compressed more than necessary.

The electrode plate unit of the present invention is an electrode plate formed of a metal plate, and has a flat plate portion, a concave portion and a convex portion located outside the plate portion and along the outer peripheral edge. An electrode plate having a peripheral portion bent so as to be alternately arranged, and a groove formed between the plate portion and the peripheral portion along the peripheral portion, and the electrode plate having A sealing member mounted in the groove, an anode-side power supply and a cathode-side power supply provided on both sides of the plate portion of the electrode plate, respectively, and the anode-side power supply and the cathode-side power supply in plan view. An anode-side spacer and a cathode-side spacer disposed so as to sandwich the body, respectively; holes are formed in the electrode plates and the spacers to form an oxygen gas path, a hydrogen gas path, and an electrolyzed water path. It has a hole on both sides of the anode spacer In addition, a sealing groove surrounding the hole forming the hydrogen gas path is formed, and a sealing groove surrounding the holes forming the oxygen gas path and the hydrogen gas path among the holes on both surfaces of the cathode side spacer. Grooves are formed.

Therefore, a plurality of the electrode plate units according to the present invention are stacked so that the projections of one electrode plate and the recesses of another electrode plate that is in contact with the one electrode plate are in contact with each other. If an electrolysis cell is formed, even if an electrode plate made of a thin metal plate is used, the peripheral wall has a strong peripheral wall due to the uneven contact, whereby the pressure resistance is improved. In addition, since the electrode plates constituting the electrolytic cell have effective elasticity, in such an electrolytic cell, each electrode plate can absorb an increase in tightening surface pressure due to thermal expansion. Further, since the seal member fitted into the groove is tightened more than necessary and does not deform into an unreasonable shape,
Creep deterioration of the seal member is effectively prevented, and as a result, a high sealing effect is maintained. Furthermore, since the positioning of each component is easy, the assembly efficiency is improved.

It is preferable to employ a metal plate having a thickness that can be press-formed because an electrode plate having concave portions and convex portions can be easily and inexpensively manufactured.

Preferably, the anode-side spacer has an oxygen gas groove communicating with a hole forming the oxygen gas passage and the anode-side power supply, on a surface of the electrode plate in contact with the plate portion of the electrode plate. A hole forming an electrolyzed water path and an electrolyzed water groove communicating with the anode-side power feeder are formed, and the hydrogen gas is provided on the surface of the cathode-side spacer, which is in contact with a plate portion of the electrode plate. A groove for hydrogen gas may be formed to connect the hole forming the passage and the cathode-side power supply.

In such an electrode plate unit, leakage of gas and water is effectively prevented, and high-purity hydrogen and oxygen can be obtained.

The electrolytic cell of the present invention comprises the above-mentioned plurality of electrode plate units arranged in the laminating direction, and a solid electrolyte membrane interposed between adjacent electrode plate units. The concave portion and the convex portion of the electrode plate face the convex portion and the concave portion of the electrode plate of the adjacent other electrode plate unit, respectively.

The above function and effect can be obtained also in such an electrolytic cell.

Another electrolytic cell of the present invention comprises a solid electrolyte membrane, an electrode plate disposed so as to sandwich the solid electrolyte membrane, and a power feeder disposed between the solid electrolyte membrane and the electrode plate. And an electrolytic cell in which the side portions have a honeycomb structure formed by a peripheral portion of the electrode plate.

In such an electrolytic cell, the pressure resistance of the electrolytic cell itself can be improved while using an electrode plate having elasticity. Therefore, it is possible to effectively absorb an increase in the tightening surface pressure between members due to thermal expansion while maintaining sufficient pressure resistance.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an electrode plate, an electrode plate unit and an electrolytic cell according to the present invention will be described with reference to embodiments shown in the accompanying drawings.

FIG. 1A is a plan view showing an embodiment of the electrolytic cell of the present invention, and FIG. 1B is a cross-sectional view of a part (honeycomb-shaped peripheral side wall) of FIG. 1A. It is a side view of the II line. FIG. 2 is a cross-sectional view showing a main part of a cross section taken along line II-II of FIG. FIG. 3 shows II in FIG.
It is sectional drawing which shows the principal part in I-III line | wire cross section. 4A is a plan view showing an embodiment of the electrode plate of the present invention, FIG. 4B is a sectional view taken along line BB of FIG. 4A, and FIG. It is CC sectional view taken on the line of FIG.4 (a).
FIG. 5 is a perspective view showing an embodiment of the electrode plate unit according to the present invention before assembly.

The electrolytic cell 1 shown in FIGS. 1 to 3 has a structure in which the solid electrolyte membrane 2 and the electrodes 2 and 3 are alternately arranged in a predetermined set such that the solid electrolyte membrane 2 is sandwiched between the electrode plate units 3 from both sides. Then, the electrolytic cell 1 is assembled by sandwiching between the end plates 22 at both ends and tightening with the tightening bolts 23.

The electrode plate unit 3 includes an electrode plate 4 made of a conductive material, and a porous power supply 5, a spacer 6, and a sealing member 7 arranged on both sides of the electrode plate 4. Reference numeral 13 denotes an oxygen path for extracting the generated oxygen gas as described later, and reference numeral 14 denotes a hydrogen path for extracting the generated hydrogen gas.
And 16 are pure water paths for supplying pure water to be subjected to electrolysis.

FIG. 4 shows the electrode plate 4 in detail.
The electrode plate 4 has a thickness that can be pressed. But,
In order to obtain suitable elasticity, it is preferably from 0.3 mm to 0.1 mm.
The thickness is 8 mm, more preferably 0.5 mm to 0.6 mm. Preferably, the electrode plate 4 is formed by stamping a titanium plate.

The electrode plate 4 has a peripheral portion 8 in which concave portions 9 and convex portions 10 are alternately aligned by press molding. Both the concave portion 9 and the convex portion 10 have a shape (a type of trapezoid) in which a regular hexagon is cut by a center line connecting the diagonals when viewed from the front (see also FIG. 4C). Such a trapezoidal shape is preferable, but is not particularly limited. For example, a waveform in which semicircular convex portions and concave portions are alternately continuous, trapezoids different from the above, and rectangles can be adopted.

As shown in FIG. 1 (b), the electrolytic cell 1 has a projection 10 of one electrode plate 4 and this one electrode plate 4.
A concave portion 9 of another electrode plate 4 adjacent to the convex portion 1 of the one electrode plate 4 and the convex portion 1 of the other electrode plate 4
It is assembled so that a gap is formed between it and zero. That is, the electrolytic cell 1 is assembled so that the side portions have a honeycomb structure (in the present embodiment, a hexagonal honeycomb structure) formed by the peripheral portions of the plurality of electrode plates. It is possible to maintain or improve the pressure resistance of the electrolytic cell while using an electrode plate that is thinner than a conventional electrode plate. Furthermore, since such an electrode plate 4 has elasticity in the laminating direction of the electrolytic cell 1, it is possible to make the sealing surface pressure of the electrolytic cell uniform.

Preferably, the electrode plate 4 is formed as shown in FIG.
As shown in (1), the concave portion 9 and the convex portion 10 are formed such that the opposing sides are shifted by a half pitch. According to this structure, the honeycomb structure can be obtained by rotating one kind of the electrode plates 4 by 180 degrees and stacking them. Therefore, the electrode plate 4 can be standardized, so that the manufacturing cost can be reduced and inventory management can be simplified.

The concave portions 9 and the convex portions 10 are formed in a predetermined size range from the outer peripheral edge of the electrode plate 4 toward the inside. Further, the electrode plate 4 is provided with the concave portions 9 and the convex portions 10.
In the arrangement (peripheral portion 8), there is a groove 11 for the seal member 7 along the peripheral edge. On the outer side and the inner side of the groove 11, an outer ridge 12a and an inner side 12b are formed to be bent along the groove 11, respectively.
The groove 11 and the ridges 12a and 12b are formed by press molding, similarly to the concave portion 9 and the convex portion 10.

Further inside the inner side ridge 12b,
A flat plate portion 4a is formed. This plate part 4a
Is located at a substantially central portion between the bottom of the concave portion 9 and the top of the convex portion 10 in the thickness direction of the electrode plate 4 (FIG. 4).
(B)). By doing so, a tray-shaped space S surrounded by the inner ridges 12b is formed on one surface side of the plate portion 4a, and a tray-shaped space S surrounded by the groove 11 is formed on the other surface side. A space S is formed (FIG. 4B).
reference). That is, in each component of the electrode plate 4, the tops of the protrusion 10, the outer ridge 12a, and the inner ridge 12b are located at the same position in the electrode plate width direction. The plate portion 4a is located at a position separated by half a distance, and the recess 9 and the bottom of the groove 11 are located at a position separated from the plate portion 4a by a distance of about half the width of the electrode plate. Has become.

In FIG. 4A, the shaded portions indicate the topmost surfaces of the electrode plate 4 (the tops of the projections 10 and the tops of the ridges 12a and 12b).

Also, of the electrode plates 4, the adjacent electrode plates 4
Where (and may be)
Coated for electrical insulation. In the present embodiment, the bottom of the concave portion 9, the top of the convex portion 10,
Top of outer side ridge 12a and groove 11 for seal member
Has a Teflon® (polytetrafluoroethylene) coating on the bottom.

As shown in FIG. 2, FIG. 3 and FIG. 5, the porous feeder 5 and a pair of spacers 6 are disposed in the spaces S on both sides of the electrode plate 4, respectively. The pair of spacers 6 are provided with the power feeder 5 in plan view.
It is arranged so as to sandwich it. The spacers 6c and 6d on the lower surface are made larger than the spacers 6a and 6b on the upper surface due to the presence of the inner protrusion 12b. Further, an annular spacer 6e is fitted in the dead space on the back side (lower surface side) of the inner ridge 12b.

At positions corresponding to the spacer 6 and the electrode plate 4, holes for forming the fluid paths 13, 14, 15, 16 are formed. Specifically, in FIGS. 2, 3 and 5, spacers 6a, 6
c and the corresponding position of the electrode plate 4
And holes for forming hydrogen paths 14 are drilled, and holes for forming pure water paths 15 and 16 are drilled at corresponding positions of the spacers 6b and 6d located on the right side and the electrode plate 4. Have been. 2, 3, and 5, the space S on the upper surface side of the electrode plate 4 becomes the hydrogen generation chamber C, and the space on the lower surface side becomes the oxygen generation chamber A. And
An annular seal member 7 for sealing the hydrogen generation chamber C and the oxygen generation chamber A from the outside is fitted into the groove 11.

2, 3, and 5, an O-ring groove 17 is formed around the oxygen passage 13 on the lower surface of the spacer 6 a located to the left of the upper surface of the electrode plate 4, and the hydrogen passage 14 is formed. A hydrogen groove 18 is formed which communicates with the hydrogen generation chamber C. An O-ring groove 17 is also formed around the oxygen passage 13 on the upper surface of the spacer 6a.

On the upper surface of the spacer 6c located on the lower left side of the lower surface of the electrode plate 4, an O-ring groove 17 is formed around the hydrogen passage 14, and the oxygen passage 13 and the oxygen generation chamber A are connected. A communicating oxygen groove 19 is formed. On the lower surface of the spacer 6c, O
A ring groove 17 is formed.

Further, the spacer 6 on the right side of the upper surface of the electrode plate 4
On the upper and lower surfaces of b, O-ring grooves 17 are formed around the pure water paths 15 and 16.

The spacer 6d on the lower right side of the electrode plate 4
The pure water paths 15 and 16 and the oxygen generation chamber A
And a groove 20 for pure water is formed.

An O-ring 21 is fitted into each O-ring groove 17. The O-ring effectively blocks each fluid path from the oxygen generation chamber, the hydrogen generation chamber, and the outside.

The pure water groove 20 formed in the spacer 6d on the lower right side has a different shape from the hydrogen groove 18 and the oxygen groove 19 formed in the other spacers 6a and 6c. That is, the hydrogen groove 18 and the oxygen groove 19 are formed as one independent groove, whereas the pure water groove 20 has a width surrounding the two pure water paths 15 and 16. In this state, a wide recess 20a communicating the pure water paths 15 and 16 with the oxygen generation chamber A, and the path 1
A plurality of small grooves 20b formed on the bottom surface of the recess 20a are formed so as to extend from 5, 5 toward the oxygen generation chamber A. By making the pure water groove 20 have such a configuration, it is possible to uniformly supply pure water, which is water to be decomposed, to the porous feeder 5. The O-ring 2 provided on the spacer 6b located on the hydrogen generation chamber side
1 prevents pure water from flowing into the hydrogen generation chamber C.

On the other hand, the oxygen gas generated in the oxygen generation chamber A is taken out of the oxygen passage 13 through the oxygen groove 19. The outflow of the oxygen gas flowing through the oxygen passage 13 into the hydrogen generation chamber C is prevented by the O-ring 21 provided in the spacer 6a provided in the hydrogen generation chamber C.

Then, the hydrogen gas generated in the hydrogen generation chamber C is taken out of the hydrogen passage 14 through the hydrogen groove 18. Similarly, the outflow of the hydrogen gas flowing through the hydrogen passage 13 to the oxygen generation chamber A is prevented by the O-ring 21 provided in the spacer 6c disposed in the oxygen generation chamber A. The leakage of the generated oxygen gas and hydrogen gas from the connection portion of the electrode plate unit 3 to the outside is prevented by the seal member 7.

The sealing member 7 is inserted into the groove 11 formed in the one electrode plate 4 and
Is pressed by the bottom of the groove 11 of another electrode plate 4 adjacent to the electrode plate 4 (see FIGS. 2 and 3). That is, the bottom of the groove 11 of the other electrode plate 4 that comes into contact with the seal member 7 fitted into the groove 11 of one electrode plate 4 is in addition to the fastening force of the fastening bolt for fastening the plurality of electrode plate units 3. Due to the pressure rise in the oxygen generation chamber A and the hydrogen generation chamber C due to the generated gas, the seal member 7 is deformed so as to be pressed toward the inner wall of the groove 11 of one electrode plate 4. Therefore, the gasket does not protrude outward due to overtightening as in the conventional electrolytic cell in which a gasket is laminated on a flat electrode plate, preventing creep deterioration due to large deformation of the gasket, Sealability can be improved.

The electrode plate unit 3 is connected to the electrolytic cell 1
When assembling, the porous feeder 5 and the spacer 6
Are disposed in the space S of the electrode plate 4, and the seal member 7 and the O-ring 21 are also disposed in the respective grooves 11 and 17. That is, the components are fitted and positioned in the corresponding recesses (spaces S, grooves 11, 17). Therefore, the electrolytic plate unit 3 according to the present embodiment is much easier to assemble than the conventional electrolytic cell.

Further, the electrolytic cell 1 according to the present embodiment
As described above, the protrusion 10 and the recess 9 of one electrode plate 4 are
The plurality of electrode plate units 3 are connected to each other so as to face the concave portions 9 and the convex portions 10 of another electrode plate 4 adjacent to the upper side of the one electrode plate 4. That is, the electrolytic cell 1 has a honeycomb-shaped side portion formed by the convex portion 10 and the concave portion 9 of the electrode plate 4 (FIG. 1B). Therefore, the electrolytic cell 1 can obtain sufficient strength to withstand a high internal pressure due to the generated gas while using the electrode plate 4 made of a metal plate having a thickness that can be press-formed. In addition, the electrode plate 4 forming the honeycomb side portion
Has a thickness such that it can be press-formed, and
Since the projections 10 have the peripheral edge portions 8 alternately arranged, the elastic portions also have appropriate elasticity. Therefore, it is possible to effectively absorb an increase in the contact surface pressure between the electrode plate units due to an assembly error during assembly, a thermal expansion of the gasket during operation, and the like. Therefore, the electrolysis cell 1 can be used for a so-called high-pressure hydrogen oxygen generator (operating pressure is about 10 atm) without using a known electrolysis tank.

The solid electrolyte membrane 2 is a so-called solid polymer electrolyte in which a catalyst electrode of a porous layer made of a platinum group metal or the like is formed on both surfaces of an ion-conductive polymer membrane by chemical plating, hot pressing or the like. A membrane may be used. Since the solid polymer electrolyte membrane is a relatively soft membrane, the solid polymer electrolyte membrane may be damaged if the contact surface pressure with the porous power supply 5 increases. However, in the present electrolytic cell 1, since the electrode plate 4 has elasticity capable of absorbing an increase in contact surface pressure due to thermal expansion, damage to the solid polymer electrolyte membrane is effectively prevented, and a stable water electrolysis action is achieved. Can be maintained for a long time.

[0054]

According to the present invention, the pressure resistance of the electrolytic cell is improved. In addition, the elasticity of the peripheral side wall of the electrolytic cell can absorb an increase in clamping surface pressure due to thermal expansion. Since the seal member fitted into the groove is not tightened more than necessary, creep deterioration is prevented. Further, since the positioning of each component is easy, the assembly is easy.

[Brief description of the drawings]

FIG. 1 (a) is a plan view showing an embodiment of the electrolytic cell of the present invention, and FIG. 1 (b) is a sectional view taken along line II of FIG. 1 (a). FIG.

FIG. 2 is a cross-sectional view showing a main part of a cross section taken along line II-II of FIG.

FIG. 3 is a cross-sectional view showing a main part of a cross section taken along line III-III of FIG.

4 (a) is a plan view showing an embodiment of the electrode plate of the present invention, FIG. 4 (b) is a sectional view taken along the line BB of FIG. 4 (a), and FIG. FIG. 4C is a cross-sectional view taken along line CC of FIG.

FIG. 5 is a perspective view showing an embodiment of an electrode plate unit according to the present invention before assembly.

FIG. 6 is a sectional view showing an example of a conventional electrolytic cell before assembly.

FIG. 7 is a perspective view showing an example of a conventional intermediate bipolar electrode plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electrolysis cell 2 ... Solid electrolyte membrane 3 ... Electrode plate unit 4 ... Electrode plate 4a ... (inner) plate part 5 ... Porous feeder 6, 6a, 6b, 6c , 6d ... spacer 7 ... sealing member 8 ... peripheral part 9 ... concave part 10 ... convex part 11 ... groove (for sealing member) 12a ... (outward side) ridge 12b・ ・ (Inward side) ridge 13 ・ ・ ・ Path for oxygen 14 ・ ・ ・ Path for hydrogen 15, 16 ・ ・ ・ Path for pure water 17 ・ ・ ・ O-ring groove 18 ・ ・ ・ Gutter for hydrogen 19 ・ ・・ Oxygen groove 20 ・ ・ ・ Pure water groove 20a ・ ・ Recess 20b ・ ・ Small groove 21 ・ ・ ・ O-ring 22 ・ ・ ・ End plate 23 ・ ・ ・ Bolt A ・ ・ ・ Oxygen generating chamber C ・ ・ ・ Hydrogen Generation room S ・ ・ ・ Space

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yutaka Ishii 283-8 Minami-Ochiai, Suma-ku, Kobe-shi, Hyogo Prefecture (72) Inventor Tsutomu Tai 658-6 Nishioka, Uozumi-cho, Akashi-shi, Hyogo (56) References JP-A-8-239788 (JP, A) JP-A-9-263982 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C25B 1/00-15/08

Claims (9)

(57) [Claims] 1. A flat plate portion, which is formed of a metal plate, and is bent outside the plate portion so that concave portions and convex portions are alternately aligned along the outer peripheral edge. An electrode plate for a water electrolysis device having a peripheral portion of 2. The electrode plate for a water electrolysis device according to claim 1, wherein the metal plate has a thickness that can be pressed. 3. The electrode for a water electrolysis apparatus according to claim 1, wherein a groove for a sealing member is formed between the plate portion and the peripheral portion by bending along the peripheral portion. Board. 4. The electrode plate for a water electrolysis device according to claim 3, wherein the plate portion is located substantially at the center of the width of the electrode plate defined by the bottom of the concave portion and the top of the convex portion. 5. An electrode plate formed from a metal plate,
A plate-shaped plate portion, a peripheral portion located outside the plate portion and bent so that concave portions and convex portions are alternately aligned along the outer peripheral edge, and the plate portion and the peripheral edge portion. An electrode plate having a groove formed to be bent along the peripheral edge portion, a sealing member mounted in the groove of the electrode plate, and both sides of the plate portion of the electrode plate. An anode-side power supply and a cathode-side power supply provided, and an anode-side spacer and a cathode-side spacer disposed so as to sandwich the anode-side power supply and the cathode-side power supply in plan view, respectively. Holes forming an oxygen gas path, a hydrogen gas path, and a water path to be electrolyzed are formed in the electrode plate and both spacers. On both surfaces of the anode-side spacer, a hydrogen gas path is formed among the holes. Forming a sealing groove surrounding the hole to be formed; On both surfaces of the side spacers, the out of hole, the electrode plate unit groove for sealing is formed surrounding the hole to form the oxygen gas path and the hydrogen gas path. 6. The electrode plate unit according to claim 5, wherein said metal plate has a thickness capable of being pressed. 7. The anode-side spacer has an oxygen gas groove communicating with a hole forming the oxygen gas path and the anode-side power supply body on a surface of the electrode plate in contact with a plate portion of the electrode plate. A hole forming an electrolyzed water path and a groove for electrolyzed water communicating with the anode-side power feeder are formed. The cathode-side spacer has a hydrogen gas path formed on a surface that is in contact with a plate portion of the electrode plate. The electrode plate unit according to claim 5, wherein a groove for hydrogen gas is formed so as to communicate the hole forming the hole and the cathode-side power supply body. 8. A plurality of electrode plate units according to claim 5, which are arranged in a stacking direction;
And a solid electrolyte membrane interposed between adjacent electrode plate units. The concave and convex portions of the electrode plate of one of the adjacent electrode plate units respectively correspond to the electrode plates of the other adjacent electrode plate unit. An electrolytic cell facing the convex and concave portions. 9. An electrolytic cell in which a solid electrolyte membrane, an electrode plate provided so as to sandwich the solid electrolyte membrane, and a power feeder provided between the solid electrolyte membrane and the electrode plate are stacked. An electrolytic cell, wherein a side portion has a honeycomb structure formed by a peripheral portion of the electrode plate.