Elastic piece for zero-polar-distance alkaline electrolytic bath and electrolytic bath

Abstract

The utility model discloses an elastic piece for a zero-polar-distance alkaline electrolytic bath and the electrolytic bath, and belongs to the field of water electrolysis hydrogen production. Comprising a base plate and a plurality of fin assemblies installed on the base plate, the fin assemblies are distributed on the base plate in an array mode in the radial direction, and each fin assembly comprises a plurality of elastic fins arranged in a staggered mode. Each elastic fin comprises a plurality of bent sections which are sequentially a first straight section, a first bent section, a second straight section, a second bent section, a third straight section and a fourth straight section from the base plate. The fin assembly and the base plate are integrally formed through welding or stamping. The elastic piece disclosed by the utility model can be mounted in the zero-polar-distance alkaline electrolytic bath for use. According to the elastic piece for the zero-polar-distance alkaline electrolytic bath and the electrolytic bath, the effects of being adjustable in height, large in elasticity and capable of enabling gas to be smoother can be achieved, and the zero-polar-distance effect is obvious.

Description

Technical Field

[0001] The utility model relates to a device for producing hydrogen by electrolyzing water, in particular to an elastic component for a zero-gap alkaline electrolytic cell and the electrolytic cell. Background Art

[0002] With the development of electrolysis technology and the increasing market demand for hydrogen energy, the high energy consumption of alkaline water electrolysis hydrogen production systems has become increasingly prominent. Improving hydrogen production efficiency and reducing electrolytic cell power consumption have gradually become people's pursuit. The alkaline electrolyzer is a key component of alkaline water electrolysis hydrogen production. Its performance and service life have a significant impact on the economic viability of the electrolysis industry. The actual alkaline electrolyzer cell voltage above the reversible equilibrium voltage consists of two parts: the positive and negative electrode overpotential and the total voltage drop. The voltage drop is caused by resistance, and the total resistance includes loop resistance, transmission resistance, and electrochemical reaction resistance. Reducing the corresponding resistance can reduce the voltage, thereby reducing the hydrogen production energy consumption of the electrolyzer. A zero-gap electrolyzer is one that closely fits the anode mesh, diaphragm, and cathode mesh, reduces the distance between the anode mesh and cathode mesh, reduces the electrolyte resistance, and reduces energy consumption.

[0003] Some traditional zero-gap electrolyzer structures use an elastic mesh woven from nickel wire, which has poor elasticity. This results in small or uneven contact between the mesh and the electrodes, making the zero-gap effect ineffective. The elastomer is relatively hard, making it difficult to compress during compression, which can cause the diaphragm to be squeezed, affecting its performance and potentially damaging it. This also results in poor gas flow within the electrolysis area. Summary of the Invention

[0004] Purpose of the utility model: The purpose of the utility model is to provide an elastic part and an electrolytic cell for a zero-gap alkaline electrolytic cell with adjustable height, greater elasticity, smoother gas flow and obvious zero-gap effect.

[0005] Technical solution: The elastic member for the zero-gap alkaline electrolytic cell described in the utility model includes a chassis and a plurality of fin assemblies installed on the chassis. The plurality of fin assemblies are distributed in an array along the radial direction on the chassis, and the fin assembly includes a plurality of staggered fins.

[0006] Preferably, the fin includes a plurality of bent sections, which are, starting from the bottom plate, a first straight section, a first bent section, a second straight section, a second bent section, a third straight section and a fourth straight section.

[0007] Preferably, the third straight segment is in a horizontal state, the angle between the second straight segment and the first straight segment is 35° to 75°, and the angle between the fourth straight segment and the third straight segment is 20° to 40°.

[0008] Preferably, the angle between the second straight segment and the first straight segment is 40° to 60°, and the angle between the fourth straight segment and the third straight segment is 25° to 30°.

[0009] Preferably, the fin assembly and the chassis are connected by welding or integrally stamped.

[0010] Preferably, the elastic member is made of nickel.

[0011] Preferably, the nickel substrate of the elastic member has a thickness of 0.1 mm to 0.5 mm.

[0012] The zero-gap alkaline electrolytic cell comprising elastic parts described in the present invention comprises bipolar plates and elastic parts fixed on both sides of the bipolar plates, an anode mesh and a cathode mesh are respectively installed on the outside of the two elastic parts, and a diaphragm and a sealing gasket are respectively installed on the outside of the anode mesh and the cathode mesh.

[0013] Preferably, the connection between the chassis in the elastic member and the bipolar plate is welding.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: (1) The height of the elastic fins is adjustable within a certain range while meeting the conductive properties; (2) The elastic fin structure has a certain elasticity when under pressure, which can reduce the distance between the electrode and the diaphragm, achieve zero gap, reduce the pressure on the diaphragm, protect the diaphragm, and extend the service life of the diaphragm; (3) The elastic fins have good elasticity, which makes the zero-gap effect of the electrolytic cell obvious, reduces the voltage of the electrolytic cell chamber and the electrolysis energy consumption; (4) In the electrolysis area, the circumferential and radial distribution of the elastic fins form a mesh, which not only makes the gas more unobstructed, but also can eliminate bubbles and play a certain supporting role. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the elastic member of the present invention;

[0016] Figure 2 is a structural diagram of the elastic fin;

[0017] Figure 3 is a perspective view of the fin assembly;

[0018] Figure 4 Arrangement diagram of the electrolytic cell assembly components described in the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present utility model will be further described below in conjunction with the embodiments.

[0020] like Figure 1-3As shown, the elastic member for the zero-gap alkaline electrolytic cell described in the present invention includes a chassis 1 and a plurality of fin assemblies 2 installed on the chassis 1. The plurality of fin assemblies 2 are distributed in an array along the radial direction on the chassis 1, and the fin assembly 2 includes a plurality of elastic fins 3 arranged in an alternating manner.

[0021] The fin assembly 2 includes a long fin assembly 21 and a short fin assembly 22 , and the long fin assembly 21 is closer to the center of the circle than the short fin assembly 22 .

[0022] The long fin assemblies 21 and the short fin assemblies 22 are evenly spaced apart in the circumferential direction.

[0023] The elastic fin 3 includes multiple bending sections, starting from the chassis 1, which are a first straight section 31, a first bent section 32, a second straight section 33, a second bent section 34, a third straight section 35 and a fourth straight section 36, so that it can be height-adjusted within a certain range and has elasticity.

[0024] The third straight segment 35 is in a horizontal state, the angle between the second straight segment 33 and the first straight segment 31 is 35° to 75°, and the angle between the fourth straight segment 36 and the third straight segment 35 is 20° to 40°.

[0025] The included angle between the second straight segment 33 and the first straight segment 31 is 40° to 60°, and the included angle between the fourth straight segment 36 and the third straight segment 35 is 25° to 30°.

[0026] The fin assembly 2 and the chassis 1 are connected by welding or integrally stamped.

[0027] The thickness of the nickel substrate of the elastic member is 0.1 mm to 0.5 mm.

[0028] like Figure 4 As shown, the zero-gap alkaline electrolytic cell comprising elastic parts described in the present invention comprises bipolar plates 4 and elastic parts 5 fixed on both sides of the bipolar plates 4, an anode mesh 6 and a cathode mesh 7 are respectively installed on the outside of the two elastic parts 5, and a diaphragm 8 and a sealing gasket 9 are respectively installed on the outside of the anode mesh 6 and the cathode mesh 7.

[0029] The base plate 1 of the elastic member 5 is welded to the bipolar plate 4 .

[0030] During the assembly process of the electrolytic cell described in the utility model, Figure 4The components in the circuit are assembled to form the main components of the electrolyzer. The side of the elastic member with the fin assembly is assembled with the anode mesh. The elastic force of the fin assembly brings the anode mesh closer to the diaphragm. Similarly, the side of the elastic member with the fin assembly on the other side of the bipolar plate is assembled with the cathode mesh. The elastic force of the fin assembly brings the cathode mesh closer to the diaphragm. This ensures a close fit between the anode mesh, diaphragm, and cathode mesh, reducing the distance between the anode mesh and cathode mesh, lowering the electrolyte resistance, and reducing energy consumption, making the zero-gap effect of the electrolyzer more pronounced.

Claims

1. An elastic member for a zero-gap alkaline electrolytic cell, comprising a chassis (1) and a plurality of fin assemblies (2) mounted on the chassis (1), characterized in that: The plurality of fin assemblies (2) are distributed in an array along a radial direction on the chassis (1), and each fin assembly (2) comprises a plurality of elastic fins (3) arranged in a staggered manner.

2. The elastic member for a zero-gap alkaline electrolytic cell according to claim 1, wherein: The elastic fin (3) comprises a plurality of bent sections, which are, starting from the base plate (1), a first straight section (31), a first bent section (32), a second straight section (33), a second bent section (34), a third straight section (35) and a fourth straight section (36).

3. The elastic member for a zero-gap alkaline electrolytic cell according to claim 2, wherein: The third straight section (35) is in a horizontal state, the angle between the second straight section (33) and the first straight section (31) is 35° to 75°, and the angle between the fourth straight section (36) and the third straight section (35) is 20° to 40°.

4. The elastic member according to claim 3, characterized in that: The included angle between the second straight section (33) and the first straight section (31) is 40° to 60°, and the included angle between the fourth straight section (36) and the third straight section (35) is 25° to 30°.

5. The elastic member for a zero-gap alkaline electrolytic cell according to claim 1, wherein: The connection between the fin assembly (2) and the chassis (1) is achieved by welding or integrally stamping.

6. The elastic member for a zero-gap alkaline electrolytic cell according to claim 1, wherein: The elastic member is made of nickel.

7. The elastic member for a zero-gap alkaline electrolytic cell according to claim 1, wherein: The thickness of the nickel substrate of the elastic member is 0.1 mm to 0.5 mm.

8. A zero-gap alkaline electrolytic cell comprising the elastic member according to claim 1, characterized in that: The assembly components of the electrolytic cell include a bipolar plate (4) and elastic members (5) fixed on both sides of the bipolar plate (4), an anode mesh (6) and a cathode mesh (7) are respectively installed on the outside of the two elastic members (5), and a diaphragm (8) and a sealing gasket (9) are respectively installed on the outside of the anode mesh (6) and the cathode mesh (7).

9. The zero-gap alkaline electrolytic cell according to claim 8, characterized in that: The connection between the chassis (1) and the bipolar plate (4) in the elastic member (5) is achieved by welding.

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