Bipolar plate assembly and modular electrolytic cell

Abstract

The utility model discloses a bipolar plate assembly and a modular electrolytic bath. The bipolar plate assembly comprises a partition plate, two side surfaces of which are respectively and completely symmetrically provided with porous transmission layers; each porous transmission layer is formed by welding a plurality of layers of metal expansion nets with different porosities; the closer the metal expansion nets are to the partition plate, the higher the porosity is, and the farther the metal expansion nets are away from the partition plate, the lower the porosity is; and the two rubber sealing frames are respectively fixed around the partition plate and the porous transmission layer from two sides, so that the partition plate and the porous transmission layer are integrated. According to the bipolar plate assembly disclosed by the utility model, the transmission efficiency of gas generated by electrolysis is improved by arranging the expansion net with the gradient porous structure and the aperture.

Description

TECHNICAL FIELD

[0001] The utility model relates to water electrolytic tank technical field more specifically, it is a bipolar plate assembly and a modular electrolytic tank. BACKGROUND

[0002] Hydrogen as fuel has the characteristics of concentrated flame, high heat value, high efficiency, etc., and can be combined with other energy sources to burn to make energy more fully utilized. It is made from water, and the combustion product is still reduced to water, and the whole process does not cause pollution to the environment. Therefore, hydrogen energy is an extremely superior secondary energy, and is the most clean and efficient new energy in the twenty-first century. At present, the technology of using electrolytic equipment to electrolyze water to produce hydrogen has been widely concerned and recognized. SUMMARY

[0003] The utility model provides a bipolar plate assembly, which aims to solve the problem that the existing bipolar plate structure cannot timely discharge the electrolyzed gas from the electrolytic tank and improve the output efficiency of the gas in the electrolytic tank.

[0004] To achieve the above technical purpose, the utility model adopts the following technical scheme:

[0005] A bipolar plate assembly comprises a partition plate, both sides of which are provided with completely symmetrical porous transmission layers; each porous transmission layer is formed by welding a plurality of metal expansion nets with different porosities; the porosity of each layer of metal expansion net is higher closer to the partition plate and lower farther away from the partition plate; and two rubber sealing frames are respectively arranged around the partition plate and the porous transmission layers on both sides to fix them and make them integrated.

[0006] Preferably, the porosity of the metal expansion net farthest away from the partition plate is 50%, and the porosity of the metal expansion net closest to the partition plate is 75%.

[0007] Preferably, the partition plate is provided with a hook outwardly extended from each end, and a voltage detection terminal socket is formed on the hook and protrudes upward.

[0008] Preferably, a gradient flow guide section is arranged on the rubber sealing frame at the electrolyte and gas inlet and outlet.

[0009] Preferably, the material of the rubber sealing frame is ethylene-propylene-diene rubber.

[0010] The bipolar plate assembly of the utility model improves the transmission efficiency of the electrolysis generated gas by setting the gradient porous structure of the expansion net and the pore size.

[0011] The application also provides a modular electrolytic cell, which comprises a press and a cation membrane water electrolytic cell.

[0012] The machine base is provided with a front fixed plate and a rear fixed plate, a fixed screw rod is arranged on the front fixed plate and the rear fixed plate, a pressure adjusting mechanism is arranged on the machine base, and the pressure adjusting mechanism comprises an adjusting screw rod, a pushing plate and a pressure sensor.

[0013] Preferably, the membrane electrode comprises a cathode electrode, a sealing frame, a cation membrane, a sealing frame and an anode electrode which are sequentially stacked.

[0014] Preferably, the cathode electrode comprises a first conductive base layer which is a 100-mesh opening plain net-shaped layer woven by nickel wires, a nickel-molybdenum catalyst is coated on the surface of the first conductive base layer, and the porosity of the first conductive base layer is 50%.

[0015] Preferably, the anode electrode comprises a second conductive base layer which is a 100-mesh opening plain net-shaped layer woven by nickel wires, Raney nickel particles are sprayed on the surface of the second conductive base layer, and the porosity of the second conductive base layer is 50%.

[0016] The modular electrolytic cell of the utility model realizes pressure adjustment of the cation membrane water electrolytic cell through the press, prevents overpressure from causing the temperature of the bipolar plate assembly to be too high, and simultaneously realizes adjustment of the number of electrolytic main assemblies in the cation membrane water electrolytic cell and replacement and maintenance of elements through adjustment of the press. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the bipolar plate assembly of the utility model;

[0018] Figure 2 It is an exploded view of the bipolar plate assembly of the utility model;

[0019] Figure 3 It is Figure 1 A-A sectional view;

[0020] Figure 4 It is a schematic diagram of the overall structure of the modular electrolytic cell of the utility modelFigure 1 ;

[0021] Figure 5 The overall structure of the modular electrolytic cell Figure 2 ;

[0022] Figure 6 It is an embodiment diagram of the electrolytic main assembly.

[0023] Figure 7 It is an exploded view of the anion membrane water electrolytic cell. DETAILED DESCRIPTION

[0024] The technical scheme of the utility model will be further specifically explained below by examples in combination with the drawings.

[0025] Referring to Figures 1-3 The bipolar plate assembly of the utility model comprises a partition plate 1, a porous transport layer 2 and a rubber sealing frame 3.

[0026] The partition plate 1 is a nickel plate, which is a partition wall separating the anode porous transport layer and the cathode porous transport layer. On the two sides of the partition plate 1, completely symmetrical porous transport layers 2 are arranged, so as to form an anode flow field and a cathode flow field. The two ends of the partition plate 1 respectively extend outwardly by a hook 11, so as to be hung on an external pressing machine, and a socket 12 of an upwardly protruding voltage detection terminal is formed on the hook 11, so as to facilitate the connection of the voltage detection terminal to monitor the voltage of each electrolytic cell unit in the electrolytic cell.

[0027] Each porous transport layer 2 is designed by gradient porosity, and is welded by a plurality of metal expansion nets with different porosities. The closer the metal expansion net is to the partition plate, the higher the porosity is, and the farther the metal expansion net is from the partition plate, the lower the porosity is. The porosity of the metal expansion net farthest from the partition plate is 50%, and the porosity of the metal expansion net closest to the partition plate is preferably 75%. The porosity of the porous transport layer 2 gradually increases along the direction of gas generation and flow, so as to improve the transmission efficiency of the electrolyte and the gas. The gradient porosity design of the utility model provides excellent mass transmission for high current density operation due to the gradient porous structure of the expansion net and the adaptive pore size.

[0028] Two rubber sealing frames 3 are respectively fixed around the partition plate 1 and the porous transport layer 2 from both sides, so as to integrate them. The material of the rubber sealing frame is ethylene-propylene-diene rubber. The rubber sealing frame has the characteristics of anti-aging, acid and alkali resistance, low water absorption, long service life, low cost, wide use temperature range and the like. The rubber sealing frame 3 is made by a molding method, and a gradient flow cross section design 31 is adopted at the inlet and outlet of the electrolyte and the gas, so as to reduce the fluid resistance and facilitate the overflow speed of the gas.

[0029] In addition, in combination withFigures 4-5 The utility model discloses still propose a kind of modular electrolytic cell shown, including a press and anion membrane water electrolytic cell 5.

[0030] Wherein, the press includes bed 41, and front fixed plate 411 and rear fixed plate 412 are equipped on bed 41.Bed 41 is as main support component.Multiple fixed screw rod 42 are threaded on the front fixed plate 411 and the rear fixed plate 412, form mounting space, while providing support for anion membrane water electrolytic cell 5.The hook 11 of the separator of bipolar plate assembly is hung on fixed screw rod 42.Pressure regulating mechanism includes an adjusting screw rod 431, a push plate 432 and a pressure sensor 433.The push plate 432 is threaded on the fixed screw rod 42 and can move relative to fixed screw rod 42.The adjusting screw rod 431 is fixed on the front fixed plate 411, and the end of the adjusting screw rod 431 is connected to the push plate 432, and the push plate 432 is driven forward or backward by the rotation of the adjusting screw rod 431 to adjust the pressure.Pressure sensor 433 is installed at the junction of adjusting screw rod 431 and push plate 432 to sense the pressure received by anion membrane water electrolytic cell 5 and transmit to a pressure display device.

[0031] The anion membrane water electrolytic cell 5 is arranged between the pressure regulating mechanism and the rear fixed plate 412.The anion membrane water electrolytic cell 5 includes a cathode end plate 51, a cathode current collector plate 52, an electrolysis main assembly 53, an anode current collector plate 54 and an anode end plate 55 which are sequentially fixed together by multiple groups of bolts.The electrolysis main assembly 53 includes multiple membrane electrodes 531 and bipolar plate assemblies 532 which are sequentially stacked.The structure of the bipolar plate assembly 532 is as described above.

[0032] The membrane electrode 531 is formed by sequentially stacking a cathode electrode, a sealing frame, an anion membrane, a sealing frame and an anode electrode.The cathode electrode includes a first conductive base material layer which is a 100-mesh open plain net-shaped layer woven by nickel wire, and a nickel-molybdenum catalyst is coated on the surface of the first conductive base material layer, and the porosity of the first conductive base material layer is 50%.The anode electrode includes a second conductive base material layer which is a 100-mesh open plain net-shaped layer woven by nickel wire, and Raney nickel particles are sprayed on the surface of the second conductive base material layer, and the porosity of the second conductive base material layer is 50%.

[0033] The modular electrolytic cell of the utility model realizes pressure regulation of anion membrane water electrolytic cell through press, prevents overpressure from causing the temperature of bipolar plate assembly to be too high, and the adjustment of the press can realize the adjustment of the number of electrolysis main assemblies in the anion membrane water electrolytic cell and the replacement and maintenance of elements.

[0034] The above-described embodiments are only used for illustrating the present application and not used for limiting the scope of the present application. Any equivalent change and modification of the present application made by those skilled in the art shall belong to the scope of the claims of the present application.

Claims

1. A bipolar plate assembly, characterized by It comprises: a partition plate, both sides of which are provided with porous transmission layers that are completely symmetrical; each of the porous transmission layers is welded by multiple layers of metal expanded mesh with different porosities; the closer the metal expanded mesh is to the partition plate, the higher the porosity is, and the farther the metal expanded mesh is from the partition plate, the lower the porosity is; two rubber sealing frames that respectively surround the partition plate and the porous transmission layers to fix them and make them integrated.

2. The bipolar plate assembly of claim 1, wherein The porosity of the metal expanded mesh farthest from the partition plate is 50%, and the porosity of the metal expanded mesh closest to the partition plate is 75%.

3. The bipolar plate assembly of claim 1, wherein Both ends of the partition plate extend outwardly to form a hook, and a socket of an upwardly protruding voltage detection terminal is formed on the hook.

4. The bipolar plate assembly of claim 1, wherein Gradient flow sections are arranged on the rubber sealing frames at electrolyte and gas inlets and outlets.

5. The bipolar plate assembly of claim 1, wherein The material of the rubber sealing frames is ethylene-propylene-diene rubber.

6. A modular electrolytic cell, characterized by, It comprises a press and an anion membrane water electrolysis tank, wherein: the press comprises: a base provided with a front fixed plate and a rear fixed plate; a fixed screw rod penetrating through the front fixed plate and the rear fixed plate; a pressure adjusting mechanism comprising an adjusting screw rod, a pushing plate and a pressure sensor, the pushing plate penetrating through the fixed screw rod, the adjusting screw rod being fixed on the front fixed plate and the end of the adjusting screw rod being connected to the pushing plate, the pushing plate being driven to move forward or backward by the rotation of the adjusting screw rod to adjust the pressure; the anion membrane water electrolysis tank is arranged between the pressure adjusting mechanism and the rear fixed plate; the anion membrane water electrolysis tank comprises a cathode end plate, a cathode current collector plate, an electrolysis main assembly, an anode current collector plate and an anode end plate which are sequentially fixed together by multiple groups of bolts; the electrolysis main assembly comprises multiple membrane electrodes and bipolar plate assemblies which are sequentially stacked, wherein: the bipolar plate assembly is as claimed in any one of claims 1 to 5.

7. The modular electrolytic cell of claim 6, wherein, The membrane electrode is sequentially stacked by a cathode electrode, a sealing frame, an anion membrane, a sealing frame and an anode electrode.

8. The modular electrolytic cell of claim 7, wherein, The cathode electrode comprises a first conductive base layer of 100-mesh opening plain netting woven by nickel wire, the surface of the first conductive base layer being coated with a nickel-molybdenum catalyst, and the porosity of the first conductive base layer being 50%.

9. The modular electrolytic cell of claim 7, wherein, The anode electrode comprises a second conductive base layer of 100-mesh opening plain netting woven by nickel wire, the surface of the second conductive base layer being sprayed with Raney nickel particles, and the porosity of the second conductive base layer being 50%.

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