Integrated plastic electrode frame polar plate with high sealing performance, electrolysis cell and electrolytic bath

Abstract

The invention discloses an integrated plastic electrode frame polar plate with high sealing performance, an electrolysis chamber and an electrolytic bath, and belongs to the technical field of water electrolysis hydrogen production equipment. The integrated plastic pole frame pole plate comprises a pole frame body and a pole plate integrally formed with the pole frame body, a plurality of cross-shaped metal sheets used for electron conduction are embedded in the pole plate, and the cross-shaped metal sheets and the integrated plastic pole frame pole plate form a sealing structure. The small electrolysis chamber sequentially comprises an integrated plastic electrode frame polar plate, an anode electrode, a diaphragm, a cathode electrode and another integrated plastic electrode frame polar plate from left to right. The electrolytic bath comprises end pressing plates and a plurality of electrolytic cells which are arranged between the end pressing plates and are connected in series. According to the invention, the cross-shaped metal sheet is embedded in the integrated plastic electrode frame polar plate, so that the length of the sealing surface can be prolonged, the sealing performance and the impact resistance of the whole structure can be improved, the mixing of hydrogen and oxygen is avoided, and the use safety of the electrolytic cell is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of water electrolysis hydrogen production equipment, and in particular to an integrated plastic pole frame pole plate, an electrolysis chamber and an electrolytic cell with high sealing performance. Background Art

[0002] At present, the main methods of producing hydrogen by water electrolysis include alkaline water electrolysis (AWE / ALK), proton exchange membrane (PEM) water electrolysis, high-temperature solid oxide (SOEC) water electrolysis, and solid polymer anion exchange membrane (AEM) water electrolysis. Among them, AWE is the earliest industrialized water electrolysis technology, with decades of application experience and the most mature; PEM water electrolysis technology has developed rapidly in recent years; SOEC water electrolysis technology is in the initial demonstration stage; and AEM water electrolysis research has just started. At present, the main water electrolysis hydrogen production technologies that can be practically applied are AWE and PEM, while SOEC electrolysis and AEM electrolysis are still in the early demonstration and research and development stages, respectively.

[0003] The pole frames and pole plates in the existing alkaline water electrolysis hydrogen production devices are made of metal materials, which not only have high manufacturing costs and complex processes, but are also difficult to assemble and have high labor costs, and are also difficult to operate and maintain in the later stages. In addition, metal materials are prone to electrochemical corrosion, which affects safety in later use.

[0004] At present, the existing electrolytic cells have achieved the purpose of reducing costs and increasing efficiency by making the pole frames and plates plastic, but there are still technical problems such as poor sealing. Summary of the invention

[0005] Purpose of the invention: The first purpose of the present invention is to provide an integrated plastic pole frame and plate with high safety and high sealing performance. The second purpose of the present invention is to provide an electrolysis chamber including the above-mentioned integrated plastic pole frame and plate. The third purpose of the present invention is to provide an electrolytic cell including the above-mentioned electrolysis chamber.

[0006] Technical solution: The one-piece plastic pole frame and plate with high sealing performance provided by the present invention comprises a pole frame body and a plate integrally formed with the pole frame body, wherein the plate is embedded with a plurality of cross-shaped metal sheets for electron conduction, and the cross-shaped metal sheets are sealedly connected with the one-piece plastic pole frame and the plate.

[0007] Furthermore, the cross-shaped metal sheet and the integrated plastic pole frame and pole plate are integrally injection molded.

[0008] Furthermore, a plurality of hydrogen outlets and a plurality of oxygen outlets are provided on the top of the electrode plate, a plurality of alkali solution inlets are provided on the bottom of the electrode plate, and water lines are provided with the hydrogen outlet, oxygen outlet and alkali solution inlet, and the outlet water lines are used to reduce the probability of hydrogen and oxygen mixing.

[0009] Furthermore, the hydrogen outlet and the oxygen outlet are staggeredly distributed.

[0010] Furthermore, a plastic cover is provided on the passages of the hydrogen outlet / oxygen outlet and the alkali solution inlet.

[0011] Furthermore, an inner sealing surface is provided at the junction of the pole frame body and the pole plate, and an outer sealing waterline is provided around the pole frame body.

[0012] Furthermore, a plurality of positioning structures are provided on the pole frame body.

[0013] The electrolysis chamber provided by the present invention comprises, from left to right, the above-mentioned integrated plastic pole frame plate, an anode electrode, a diaphragm, a cathode electrode and another piece of the above-mentioned integrated plastic pole frame plate.

[0014] Furthermore, a gasket is provided between the anode electrode or cathode electrode and the integrated plastic pole frame plate, and the gasket is installed in the area between the inner sealing surface and the outer sealing waterline on the integrated plastic pole frame plate; the gasket is used to prevent leakage of alkali solution and gas to ensure the inner and outer sealing of the electrode chamber.

[0015] The electrolytic cell provided by the present invention comprises end pressure plates and a plurality of electrolytic chambers connected in series and arranged between the end pressure plates.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following significant effects:

[0017] (1) The present invention adopts an integrated plastic pole frame and pole plate to replace the metal pole frame and pole plate fixed by welding in the existing electrolytic cell, and provides a metal sheet with electron conduction function. Compared with the point contact of the existing electrolytic cell device, the metal sheet of the present invention can achieve surface contact, thereby increasing the transfer area. The good sealing between the metal sheet and the plastic pole plate prevents hydrogen and oxygen from cross-gassing on both sides;

[0018] (2) The present invention arranges a cross-shaped metal sheet on the integrated plastic pole frame and pole plate, which can extend the sealing length and area and thus improve the sealing and impact resistance of the overall structure, avoid the mixing of hydrogen and oxygen, and ensure the safety of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the electrolysis chamber;

[0020] Figure 2 It is a schematic diagram of the structure of an integrated plastic pole frame and pole plate;

[0021] Figure 3 It is a schematic diagram of the partial structure of an integrated plastic pole frame and pole plate;

[0022] Figure 4 It is a cross-shaped metal sheet structure;

[0023] Figure 5 Another structural schematic diagram of an integrated plastic pole frame and pole plate. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the embodiments and drawings.

[0025] Example 1: Figure 1 As shown, the electrolytic cell provided by the present invention includes an end pressure plate, and a plurality of electrolytic chambers connected in series between the end pressure plates, wherein the electrolytic chamber includes, from left to right, an integrated plastic pole frame plate 1, a gasket 2, an anode electrode 3, a diaphragm 4, a cathode electrode 5 and another integrated plastic pole frame plate 1. The integrated plastic pole frame plate 1 adopts an alkali-resistant plastic pole frame plate, such as PPU or PPSU, which has strong chemical corrosion resistance and is free of metal impurities, thereby fundamentally eliminating the risk of electrochemical corrosion, and also greatly reducing the weight, size and production cost of the device, making it easy to install, transport and maintain.

[0026] like Figure 2 As shown, the integrated plastic pole frame plate 1 is a square structure, including a pole frame body 6 and a pole plate 7 integrally formed with the pole frame body, a plurality of hydrogen outlets 8 and a plurality of oxygen outlets 9 are arranged on the top of the pole frame body 6, and the hydrogen outlets 8 and the oxygen outlets 9 are staggered, and a plurality of alkali liquid inlets 10 are arranged at the bottom, and the alkali liquid inlet 10 is connected with the alkali liquid channel 11 through the intermediate pole plate or the end pole plate; a waterline 12 is arranged on the hydrogen outlet 8, the oxygen outlet 9 and the alkali liquid inlet 10; in order to ensure the sealing of the structure, an inner sealing surface 13 is arranged between the pole frame body 6 and the pole plate 7, and an outer sealing waterline 14 is arranged around the pole frame body 6 to the outside, and the area between the inner sealing surface 13 and the outer sealing waterline 14 is used for arranging Figure 1 The gasket 2 is used to prevent alkali solution and gas leakage and ensure the inner and outer sealing of the electrolytic chamber; Figure 3 As shown, the electrode plate 7 is provided with a plurality of cross-shaped metal sheets 15 for electron conduction. Figure 4 As shown), the sealing surface between the metal sheet and the integrated plastic pole frame plate is increased from the existing one sealing surface 19 to three sealing surfaces, which can significantly improve the sealing and use safety of the entire device. In order to ensure the sealing of the overall structure, the cross-shaped metal sheet and the integrated plastic pole frame plate are integrally injection molded.

[0027] In order to facilitate the installation and fixation of the electrolytic chamber, a plurality of positioning structures 16 are provided on the pole frame body 6, and the positioning structures 16 are preferably symmetrically distributed.

[0028] like Figure 5As shown, in order to further improve the sealing performance, an outlet plastic cover plate 17 is provided on the passage of the hydrogen outlet 8 , and an inlet plastic cover plate 18 is provided on the passage of the alkali solution inlet 10 .

[0029] The working principle of the electrolyzer provided in this embodiment is as follows: alkali solution flows into the electrolysis chamber from the alkali solution inlet 10 at the bottom of the integrated plastic pole frame plate 1, and then is distributed between each cross-shaped metal sheet 15. As the alkali solution rises, the cathode and anode continuously produce hydrogen and oxygen, and the temperature continues to rise. The mixture of hydrogen, oxygen and alkali solution reaches their respective outlets and flows out of the electrolyzer. During the working process, the plastic pole plate isolates the gas mixture on both sides, and the cross-shaped metal sheet 15 is responsible for electron transmission and provides space for the flow of alkali solution and gas. The overall injection molding process is adopted, which eliminates the processes such as processing, testing, welding, and electroplating, greatly simplifies the manufacturing process and reduces costs.

Claims

1. An integrated plastic pole frame plate with high sealing performance, It is characterized in that It comprises a pole frame body and a pole plate integrally formed with the pole frame body, wherein the pole plate is embedded with a plurality of cross-shaped metal sheets for electron conduction, and the cross-shaped metal sheets are sealedly connected with the integral plastic pole frame and the pole plate.

2. The one-piece plastic pole frame plate with high sealing performance according to claim 1, It is characterized in that The cross-shaped metal sheet and the integrated plastic pole frame and pole plate are integrally injection molded.

3. The one-piece plastic pole frame plate with high sealing performance according to claim 1, It is characterized in that The top of the electrode plate is provided with a plurality of hydrogen outlets and a plurality of oxygen outlets, the bottom of the electrode plate is provided with a plurality of alkali solution inlets, and the hydrogen outlet, the oxygen outlet and the alkali solution inlet are all provided with water lines.

4. The one-piece plastic pole frame plate with high sealing performance according to claim 1, It is characterized in that An inner sealing surface is provided at the junction of the pole frame body and the pole plate.

5. The one-piece plastic pole frame pole plate with high sealing performance according to claim 1, It is characterized in that The pole frame body is provided with an external sealing water line on all sides thereof.

6. The one-piece plastic pole frame plate with high sealing performance according to claim 1, It is characterized in that The plastic pole frame body is provided with a plurality of positioning structures.

7. An electrolysis chamber, It is characterized in that From left to right, it comprises the integrated plastic pole frame plate according to any one of claims 1 to 6, an anode electrode, a diaphragm, a cathode electrode and another integrated plastic pole frame plate according to any one of claims 1 to 6.

8. The electrolysis chamber according to claim 7, It is characterized in that A gasket is also provided between the anode electrode or cathode electrode and the integrated plastic pole frame plate.

9. The electrolysis cell according to claim 8, It is characterized in that The gasket is installed in the area between the inner sealing surface and the outer sealing waterline on the integrated plastic pole frame pole plate.

10. An electrolytic cell, It is characterized in that The invention comprises end pressure plates and a plurality of electrolysis chambers as claimed in claim 7 which are connected in series and are arranged between the end pressure plates.

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