Auxiliary structure of electrolytic cell in alkaline water electrolyzer and alkaline water electrolyzer

Abstract

The utility model discloses a kind of auxiliary structure of electrolytic cell in alkaline water electrolysis tank and alkaline water electrolysis tank, belong to the field of electrolytic water hydrogen production. The auxiliary structure of electrolytic cell in alkaline water electrolysis tank, including two polar plates, polar plate includes main polar plate and the polar frame at its both ends, polar frame is equipped with lye flow channel, the gasket and conducting plate are equipped between the two polar plates. Conducting plate has alkali resistance, high temperature resistance, conductivity. The height of the auxiliary structure is not greater than electrolytic cell, and the same as the appearance structure and electrolytic cell. Alkaline water electrolysis tank provided by the utility model can achieve the effect of improving voltage consistency, simple structure and low cost.

Description

Technical Field

[0001] This utility model relates to hydrogen production by water electrolysis, and in particular to an auxiliary structure for an electrolysis chamber in an alkaline water electrolyzer and the alkaline water electrolyzer itself. Background Technology

[0002] Alkaline water electrolysis hydrogen production equipment typically employs a structure of multiple electrolysis chambers connected in series, such as... Figure 3 As shown, each chamber is equipped with electrodes, diaphragms, and fluid channels, forming a standard electrolysis reaction unit. In actual operation, due to factors such as manufacturing errors, uneven liquid feeding, and temperature gradients, the working voltage of each chamber often varies. In particular, the first chamber closest to the positive electrode plate has a voltage value significantly higher than the average level due to flow characteristics and external heat exchange. Long-term operation will accelerate the aging of electrode and membrane materials, seriously affecting the overall lifespan and efficiency. At present, most of the technical means to improve consistency are concentrated in the following three aspects: (1) manufacturing and assembly processes with higher precision; (2) introducing complex flow distributors or flow splitting structures; (3) adding temperature and bubble monitoring systems. CN119710748A discloses a new adjustable partition alkaline electrolyzer process and a matching electrolysis chamber structure. The proposed four-part dynamic adjustment system is linked with the hydrogen molecule detector and the regulating valve to achieve dynamic balance of flow in each channel, which can control the current density difference within ±3%. CN120060924A discloses a method for uniformly distributing electrolyte flow and an industrial-scale electrolyzer. This electrolyzer calculates the local resistance of each electrolysis chamber by changing the flow area of ​​each pipeline, and calculates the flow rate of each electrolysis chamber according to the mass conservation equation and Bernoulli's equation. By adjusting the flow area of ​​the inlets of the hydrogen and oxygen side electrolysis chambers to distribute the electrolyte according to an arithmetic sequence, the flow deviation can be reduced to <2%. CN220703813U discloses a bipolar plate, end plate, and alkaline electrolyzer. By rationally arranging a first and second alkali inlet through-hole group at the bottom of the electrode frame, the alkali first enters the through-holes of the through-hole group, and then enters the electrolysis chamber through the second through-hole, achieving uniform distribution of the alkali.

[0003] All of the above solutions either add extra equipment or employ a non-uniform design, making the system more complex. Furthermore, none of these solutions can simultaneously address the issues of uneven temperature and flow. Existing solutions suffer from drawbacks such as high cost, high complexity, or limited effectiveness. Summary of the Invention

[0004] Purpose of the utility model: The purpose of this utility model is to provide an auxiliary structure for the electrolysis chamber in an alkaline water electrolyzer that can improve voltage consistency, has a simple structure, and a low cost.

[0005] Another objective of this invention is to provide an alkaline water electrolysis cell including the above-mentioned auxiliary structures.

[0006] Technical solution: The auxiliary structure of the electrolysis chamber in the alkaline water electrolysis cell of this utility model includes two electrode plates. The electrode plates include a main electrode plate and electrode frames at both ends. Alkali flow channels are opened on the electrode frames. A gasket and a conductive plate are provided between the two electrode plates.

[0007] Preferably, the conductive plate is an elastomer, and more preferably a mesh porous structure formed of nickel wire or a nickel foam structure.

[0008] Preferably, the height of the auxiliary structure is no greater than that of the electrolysis chamber, and the external shape of the auxiliary structure is the same as that of the electrolysis chamber.

[0009] Preferably, the main electrode plate is a nipple plate or a flat plate.

[0010] The alkaline water electrolyzer of the present invention includes a negative end pressure plate, a negative end electrode plate, an electrolysis chamber, an auxiliary structure, a positive end electrode plate, and a positive end pressure plate arranged in sequence. Multiple electrolysis chambers are provided, and the alkaline solution flow channel is connected to the main flow channel in the electrolyzer.

[0011] Preferably, there are 1-2 auxiliary structures.

[0012] Beneficial effects: Compared with the prior art, this utility model has the following advantages: (1) The auxiliary structure has the functions of conductivity and fluid regulation, which is conducive to improving the voltage consistency of the electrolysis chamber, especially to alleviating the problem of the voltage of the first electrolysis chamber being too high; (2) The auxiliary structure is installed between the end plate of the electrolytic cell and the first electrolysis chamber, which is simple in structure and significantly alleviates the aging problem of the first electrolysis chamber; (3) The auxiliary structure is installed between the end plate of the electrolytic cell and the first electrolysis chamber, which is conducive to improving the range of the electrolytic cell, with the range not exceeding 5%, and improving the service life of the electrolytic cell; (4) The auxiliary structure is simple to improve and easy to integrate into the existing structure, with low cost. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall appearance of the present utility model;

[0014] Figure 2 A schematic diagram of an electrolytic cell with the auxiliary structure described in this utility model installed;

[0015] Figure 3 This is a schematic diagram of a traditional electrolysis chamber;

[0016] Figure 4 This represents the voltage of each electrolysis cell in the electrolytic cell at different times. Detailed Implementation

[0017] The technical solution of this utility model will be further described below with reference to the embodiments.

[0018] Example 1

[0019] like Figure 1 As shown, the auxiliary structure 11 of the electrolysis chamber in the alkaline water electrolysis cell of this utility model includes two electrode plates 1. Each electrode plate 1 includes a main electrode plate 12 and electrode frames 13 at both ends. An alkaline solution flow channel 4 is provided on the electrode frames 13. A gasket 2 and a conductive plate 3 are provided between the two electrode plates 1. The auxiliary structure 11 does not include electrodes or a diaphragm.

[0020] The height of the auxiliary structure 11 is no greater than that of the electrolysis chamber, and the external shape of the auxiliary structure 11 is the same as that of the electrolysis chamber.

[0021] The conductive plate 3 is alkali-resistant, high-temperature resistant, and conductive.

[0022] The conductive plate 3 is an elastic body so that it can contact both sides of the electrode plate. Even if there are manufacturing dimensional errors in the electrode plate or the conductive plate, they can still make contact with each other due to the elasticity of the conductive plate.

[0023] The conductive plate 3 is a mesh structure formed by nickel wire.

[0024] The auxiliary structure is detachable. Like other electrolysis chambers, it is formed by stacking the main electrode plate 12, conductive plate 3, and gasket 2 together, which makes it easy to replace or adapt to electrolysis cells of different specifications.

[0025] The auxiliary structure does not contain any catalytically active material for gas generation, thus preventing the electrolytic gas production reaction from occurring.

[0026] The main electrode plate 12 is a nipple plate or a flat plate.

[0027] like Figure 2 As shown, the alkaline water electrolyzer of this utility model includes a negative end pressure plate 6, a negative end electrode plate 7, an electrolysis chamber 8, an auxiliary structure 11, a positive end electrode plate 9, and a positive end pressure plate 10 arranged in sequence, and the electrolysis chamber 8 is provided in multiple ways.

[0028] There are two auxiliary structures 11.

[0029] The alkali flow channel 4 is connected to the main flow channel in the electrolytic cell to balance the electrolyte flow rate and temperature.

[0030] like Figure 4 As shown, a 100 standard cubic meter electrolytic cell including the auxiliary structure described in this utility model was tested. Seven sets of voltages of each electrolytic cell at different times were randomly selected. It can be seen that the voltage difference of each electrolytic cell is <4.0%.

Claims

1. An auxiliary structure for an electrolysis chamber in an alkaline water electrolyzer, the auxiliary structure (11) comprising two electrode plates (1), each electrode plate (1) comprising a main electrode plate (12) and electrode frames (13) at both ends, the electrode frames (13) having alkaline flow channels (4), characterized in that, A gasket (2) and a conductive plate (3) are provided between the two electrode plates (1).

2. The auxiliary structure of the electrolysis chamber in the alkaline water electrolyzer according to claim 1, characterized in that, The conductive plate (3) is an elastomer.

3. The auxiliary structure of the electrolysis chamber in the alkaline water electrolyzer according to claim 2, characterized in that, The conductive plate (3) is a mesh porous structure formed by nickel wire or a foam nickel structure.

4. The auxiliary structure of the electrolysis chamber in the alkaline water electrolyzer according to claim 1, characterized in that, The height of the auxiliary structure (11) is no greater than that of the electrolysis chamber, and the external structure of the auxiliary structure (11) is the same as that of the electrolysis chamber.

5. The auxiliary structure of the electrolysis chamber in the alkaline water electrolyzer according to claim 1, characterized in that, The main electrode plate (12) is a nipple plate or a flat plate.

6. An alkaline water electrolysis cell including the auxiliary structure described in claim 1, characterized in that, It includes a negative end pressure plate (6), a negative end electrode plate (7), an electrolysis chamber (8), an auxiliary structure (11), a positive end electrode plate (9), and a positive end pressure plate (10) arranged in sequence. There are multiple electrolysis chambers (8), and the alkali flow channel (4) is connected to the main flow channel in the electrolysis cell.

7. The alkaline water electrolysis cell according to claim 6, characterized in that, The auxiliary structure (11) is provided in 1-2 parts.

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