CN213772230U

CN213772230U - Novel proton exchange membrane water electrolyzer end plate

Info

Publication number: CN213772230U
Application number: CN202022749432.6U
Authority: CN
Inventors: 孙凯; 俞红梅; 邵志刚; 韦世慧; 刘凯; 迟军
Original assignee: Dalian Institute of Chemical Physics of CAS
Current assignee: Dalian Institute of Chemical Physics of CAS
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-07-23
Anticipated expiration: 2030-11-24

Abstract

The utility model discloses a novel proton exchange membrane water electrolyzer end plate, which belongs to the technical field of pure water electrolysis. The end plate of the proton exchange membrane water electrolyzer comprises an end plate, a lining and a sealing ring; the bushing is embedded in the end plate, and the sealing ring ensures the sealing state of the bushing and the collector plate. The end plate is provided with a polytetrafluoroethylene lining and a sealing ring, so that the pure water cannot be directly contacted with the end plate, and metal ions on the end plate cannot enter water to cause the conductivity of the pure water to be increased. The end plate of the electrolytic cell is particularly suitable for occasions where metal ions easily enter reaction water, such as a stainless steel end plate, an aluminum alloy end plate and the like.

Description

Novel proton exchange membrane water electrolyzer end plate

Technical Field

The utility model belongs to the technical field of pure water electrolysis, concretely relates to novel proton exchange membrane water electrolyser end plate.

Background

The proton exchange membrane is used as the basis of the membrane electrode, and the electrolyte can be industrial pure water, so that the production difficulty of the electrolyte and the pollution of waste liquid to the environment are greatly reduced. The end plate of the existing proton exchange membrane water electrolyzer technology is mainly made of titanium alloy, but the price is very high, and the titanium alloy has high strength, low thermal conductivity and very difficult processing. Stainless steel and aluminum alloy materials are also used, and the conductivity of the electrolyte cannot be ensured by simply using the materials, but the conductivity of the electrolyte is very important for the proton exchange membrane water electrolyzer. The conductivity of the electrolyte is reduced, the consumption of water can be reduced, and the service life of the membrane electrode is prolonged.

SUMMERY OF THE UTILITY MODEL

The invention aims to overcome the defects that the electrolyte is polluted due to the fact that a stainless steel end plate is used only and the manufacturing cost of a titanium end plate is high in the prior art, and provides a novel proton exchange membrane water electrolyzer end plate which is low in cost, can avoid harmful metal ions brought to an electrolyzer due to the fact that the stainless steel end plate is used only, and reduces the replacement frequency of the electrolyte.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a novel proton exchange membrane water electrolysis cell end plate comprises an end plate, a lining and a sealing ring; the bushing is embedded in the end plate, and the sealing ring enables the bushing and the collector plate to keep a sealing state.

Further, in the above technical solution, the end plate has two oxygen/water gaps and two hydrogen passages, respectively, the upper half of the passage is a cylindrical structure, the lower half of the passage is a square structure, and the diameter of the cylindrical structure is smaller than the length of the square structure; the upper half cylindrical structure is consistent with the external pipeline of the end plate in form, so that the external pipeline can be hermetically inserted into the cylindrical structure part of the end plate; the square structure of the lower half part is consistent with the structural style below the end plate, the square structure below the end plate is the same as the size and the shape of electrolyte or a gas channel inside the electric pile, and the electrolyte or the gas enters the cylindrical structural part of the end plate through an external pipeline, then enters the square structural part of the end plate and finally enters the internal channel of the electric pile.

Further, among the above-mentioned technical scheme, the bush is split type structure, comprises hollow cylinder bush and hollow square bush, all has the seal groove on two kinds of bushes, uses the sealing washer sealed hollow cylinder bush and hollow square bush, hollow square bush and current collection board respectively.

Further, in the above technical solution, the hollow cylindrical liner is in interference fit with the cylindrical shape of the upper half part of the oxygen/water gap and the hydrogen channel of the end plate; the hollow square bush is in interference fit with the square structures of the oxygen/water gap of the end plate and the lower half part of the hydrogen channel.

Furthermore, in the above technical scheme, the end plate is made of a material which is easy for metal ions to enter water.

Furthermore, in the above technical solution, the material which is easy for metal ions to enter water includes stainless steel or aluminum alloy.

Further, in the above technical solution, the material of the bushing may be a non-metal material.

Further, in the above technical solution, the non-metallic material includes polytetrafluoroethylene or nylon.

Advantageous effects

1. The end plate of the novel proton exchange membrane water electrolyzer can avoid the situation that harmful metal ions are brought to the electrolyzer by simply using the stainless steel end plate, reduce the replacement times of electrolyte and prolong the service life of the membrane electrode.

2. The novel stainless steel end plate with the bushing replaces the original titanium end plate, and the cost is reduced.

3. The end plate is provided with a polytetrafluoroethylene lining and a sealing ring, so that the pure water cannot be directly contacted with the end plate, and metal ions on the end plate cannot enter water to cause the conductivity of the pure water to be increased. The end plate of the electrolytic cell is particularly suitable for occasions where metal ions easily enter reaction water, such as a stainless steel end plate, an aluminum alloy end plate and the like.

Drawings

Fig. 1 is a schematic structural diagram of the end plate of the proton exchange membrane water electrolyzer of the present invention.

Fig. 2 is a schematic view of the end plate and bushing assembly.

Fig. 3 is a schematic view of a bushing structure.

The device comprises an end plate 1, a bushing 2, a hollow cylindrical bushing 21, a hollow square bushing 22, a sealing ring 3 and a collector plate 4.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

A novel proton exchange membrane water electrolyzer end plate comprises an end plate 1, a lining 2 and a sealing ring 3; wherein the bush 2 is embedded in the end plate 1, and the packing 3 keeps the bush 2 itself and the bush 2 and the current collecting plate 4 in a sealed state. The end plate 1 is respectively provided with two oxygen/water gaps and two hydrogen channels, the upper half part of each channel is of a cylindrical structure, the lower half part of each channel is of a square structure, and the diameter of each cylindrical structure is smaller than the length of each square structure; the upper half cylindrical structure is consistent with the external pipeline of the end plate in form, so that the external pipeline can be hermetically inserted into the cylindrical structure part of the end plate; the square structure of the lower half part is consistent with the structural style below the end plate, the square structure below the end plate is the same as the size and the shape of electrolyte or a gas channel inside the electric pile, and the electrolyte or the gas enters the cylindrical structural part of the end plate through an external pipeline, then enters the square structural part of the end plate and finally enters the internal channel of the electric pile. The bush 2 is a split structure and is composed of a hollow cylindrical bush 21 and a hollow square bush 22, two kinds of bushes are provided with sealing grooves, and the hollow cylindrical bush 21, the hollow square bush 22 and the current collecting plate 4 are sealed by using a sealing ring 3 respectively. The hollow cylindrical liner 21 is in interference fit with the cylindrical shape of the upper half part of the oxygen/water gap and hydrogen channel of the end plate 1; the hollow square bush 22 is in interference fit with the square structure of the lower half of the oxygen/water gap and hydrogen gas channel of the end plate 1.

The end plate 1 is made of a material which is easy for metal ions to enter water. Materials that are susceptible to metal ions entering the water include stainless steel or aluminum alloys. The material of the liner 2 may be a non-metallic material. The non-metallic material comprises polytetrafluoroethylene or nylon.

Example 2

The end plate with the bush is used as the upper end plate of the electrolytic cell, and the bipolar plate and the membrane electrode which are arranged in turn on one side of the hollow square bush close to the end plate are sequentially assembled with the upper insulation plate, the current collecting plate and the plurality of groups, and the lower current collecting plate, the lower insulation plate and the lower end plate. All parts were assembled using bolts to obtain a hydrogen production of 25Nm³The electrolytic cell of the/h. The galvanic pile is placed in a test system, and the test system is built for a plastic pipeline to prevent the entering ions from being mixed into the electrolyte. The metal ions in the measured water are not increased in the working process.

The foregoing embodiments are provided for illustration and description of the invention and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed.

Claims

1. The novel end plate of the proton exchange membrane water electrolyzer is characterized by comprising an end plate (1), a lining (2) and a sealing ring (3); the bushing (2) is embedded in the end plate (1), and the sealing ring (3) enables the bushing (2) and the collector plate (4) to keep a sealing state.

2. The end plate of a novel proton exchange membrane water electrolyzer as claimed in claim 1, characterized in that the end plate (1) has two oxygen/water ports and two hydrogen passages, respectively, the upper half of the passages is of a cylindrical structure, the lower half is of a square structure, and the diameter of the cylindrical structure is smaller than the length of the square structure.

3. The end plate of a proton exchange membrane water electrolyzer as claimed in claim 1, wherein the bushing (2) is a split structure and comprises a hollow cylindrical bushing (21) and a hollow square bushing (22), and the two bushings are provided with sealing grooves for sealing the hollow cylindrical bushing (21) and the hollow square bushing (22), the hollow square bushing (22) and the current collecting plate (4) respectively by using the sealing ring (3).

4. A novel end plate of a proton exchange membrane water electrolyser as claimed in claim 1, wherein the hollow cylindrical liner (21) is a cylindrical interference fit with the upper half of the oxygen/water port and hydrogen channel of the end plate (1); the hollow square bush (22) is in interference fit with the square structures of the oxygen/water gap of the end plate (1) and the lower half part of the hydrogen channel.

5. The end plate of a proton exchange membrane water electrolyzer as claimed in claim 1, characterized in that the material of the end plate (1) is a material which is easy for metal ions to enter water.

6. The end plate of a proton exchange membrane water electrolyzer as claimed in claim 5, wherein the material susceptible to metal ions entering the water comprises stainless steel or aluminum alloy.

7. A novel end plate for a proton exchange membrane water electrolyser as claimed in claim 1 wherein the material of the liner (2) is non-metallic.

8. The novel end plate of a proton exchange membrane water electrolyzer of claim 7, wherein said non-metallic material comprises polytetrafluoroethylene or nylon.