Runner sealing bipolar plate for alkaline electrolytic bath

Abstract

According to the flow channel sealing bipolar plate for the alkaline electrolytic cell disclosed by the invention, the multi-channel hydrogen-alkali and oxygen-alkali gas channel holes, the hydrogen-alkali and oxygen-alkali gas channel grooves, the alkali liquor cathodes, the anode liquid inlet holes, the alkali liquor cathodes and the anode liquid inlet grooves which are mutually staggered are arranged, so that a plurality of alkali liquor circulation and distribution channels which are distributed in a staggered manner can be provided for each small electrolytic chamber; the electrolysis cells are rapidly filled with alkali liquor, the uniformity and consistency of the concentration of the alkali liquor at all positions are ensured, gas-liquid two-phase flow fields in the electrolysis cells are distributed more uniformly, rising bubbles can be rapidly discharged at the nearest outlet at the fastest speed, gas gathering is reduced, gas dead zones in the electrolysis cells are eliminated, alkali liquor resistance voltage drop is reduced, and the service life of the electrolysis cells is prolonged. Therefore, the electrolysis energy consumption of the alkaline electrolytic bath is reduced, and the electrolysis efficiency is improved; meanwhile, by arranging corresponding flow channel sealing structures, mutual mixing of hydrogen and oxygen in the small electrolysis chambers is avoided, so that the purity of hydrogen and oxygen in the alkaline electrolytic cell is improved, and high safety, long service life and stable operation of the alkaline electrolytic cell are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of water electrolysis hydrogen production equipment, and particularly relates to a flow channel sealed bipolar plate for an alkaline electrolytic cell. Background Art

[0002] The alkaline electrolyzer is the core equipment in alkaline water electrolysis hydrogen production systems, a device that electrolyzes water to produce hydrogen and oxygen. Currently, most alkaline electrolyzers used in existing alkaline water electrolysis hydrogen production systems utilize a bipolar filter press structure, consisting of multiple parallel electrolysis chambers, each secured with two end plates and several tension bolts to form a compact filter press structure. Several to hundreds of electrolysis chambers are arranged in parallel and upright positions within the electrolyzer. Each chamber consists of a high-performance bipolar plate assembly, anode and cathode electrodes, a diaphragm, a sealing gasket, and other key components. The plate assembly is bipolar, with a cathode on one side and an anode on the other. During water electrolysis, under the action of direct current, a hydrogen evolution reaction occurs on the cathode side of each electrolysis chamber to produce hydrogen, and an oxygen evolution reaction occurs on the anode side to produce oxygen.

[0003] The bipolar plate assembly is the most important repetitive component in the electrolyzer. It is mainly formed by welding, injection molding or gluing the electrode frame and the electrode plates. The electrode frame is provided with hydrogen alkali, oxygen alkali gas flow holes, alkali liquid flow holes and positioning holes. In existing alkaline electrolyzer technology, a single alkali liquid cathode and anode inlet are usually provided at the lower end of the electrode frame, and two sets of gas flow holes are provided at the upper end of the electrode frame, usually with a hydrogen alkali outlet on one side and an oxygen alkali outlet on the other side. The investigation found that no patents or manufacturers have proposed the design of flow channel sealing structures around the flow channel grooves on both sides of the electrode frame. The common bipolar plate structure has little effect on the purity of the hydrogen and oxygen generated gases in the cathode and anode chambers on both sides of each electrolysis chamber of a small-diameter electrolyzer. The probability of cross-talk between the hydrogen and oxygen generated gases in each electrolysis chamber and the resulting implosion is also relatively low.

[0004] With the increasing demand for green hydrogen in recent years, alkaline electrolyzers have been developing in larger sizes and squares. As the diameter of the electrolyzer increases, the single alkaline solution cathode and anode inlet at the bottom of the bipolar plate frame will cause large differences in alkaline solution concentration throughout the electrolyzer, poor alkaline solution flow disturbance performance, and large temperature differences between the electrolysis chambers. The single-sided distribution of hydrogen and oxygen outlets at the top of the bipolar plate frame will cause uneven distribution of the gas-liquid two-phase flow field within the alkaline electrolyzer. Bubbles generated during water electrolysis cannot be discharged in a timely manner, causing gas accumulation in the electrolysis chamber, increasing the resistance of each electrolysis chamber, uneven current density in the alkaline electrolyzer, and low electrolysis efficiency. Trace amounts of generated hydrogen and oxygen will cross-contaminate the alkaline solution inlets and gas-liquid outlets on both sides of the bipolar plate frame, resulting in low purity of the generated hydrogen and oxygen in the alkaline electrolyzer. Severe cross-contamination of hydrogen and oxygen can cause explosions or implosions in the electrolysis chamber, affecting the safe operation of the alkaline electrolyzer. Summary of the Invention

[0005] The purpose of the present invention is to provide a flow channel sealed bipolar plate for an alkaline electrolytic cell, which solves the problems of low electrolysis efficiency and low purity of hydrogen and oxygen in existing alkaline electrolytic cells.

[0006] The technical solution adopted by the present invention is as follows: a flow channel sealed bipolar plate for an alkaline electrolytic cell comprises a polar plate and a peripheral polar frame, wherein a plurality of staggered oxygen and hydrogen-alkali gas channel holes are uniformly spaced along the circumference on the upper portion of the polar frame, wherein the oxygen-alkali gas channel hole is provided with an oxygen-alkali gas channel groove connected thereto near one end of the anode surface of the polar plate, and a hydrogen-alkali flow channel seal is provided near one end of the cathode surface of the polar plate; the hydrogen-alkali gas channel hole is provided with a hydrogen-alkali gas channel groove connected thereto near one end of the cathode surface of the polar plate, and an oxygen-alkali flow channel seal is provided near one end of the anode surface of the polar plate; a plurality of staggered alkali liquid anode and cathode liquid inlet holes are uniformly spaced along the circumference on the lower portion of the polar frame, wherein the alkali liquid anode liquid inlet hole is provided with an alkali liquid anode liquid inlet groove connected thereto near one end of the anode surface of the polar plate, and an alkali liquid cathode flow channel seal is provided near one end of the cathode surface of the polar plate; the alkali liquid cathode liquid inlet hole is provided with an alkali liquid cathode liquid inlet groove connected thereto near one end of the cathode surface of the polar plate, and an alkali liquid anode flow channel seal is provided near one end of the anode surface of the polar plate.

[0007] The present invention is also characterized in that: The oxygen and alkali airway holes and the hydrogen and alkali airway holes are axially symmetrically distributed with the vertical center line of the pole frame as the axis, the alkali solution anode inlet hole and the alkali solution cathode inlet hole are axially symmetrically distributed with the vertical center line of the pole frame as the axis, the line connecting the center line of the oxygen and alkali airway holes and the center line of the alkali solution anode inlet hole passes through the center point of the pole plate, and the line connecting the center line of the hydrogen and alkali airway holes and the center line of the alkali solution cathode inlet hole passes through the center point of the pole plate.

[0008] The oxygen-alkali airway holes, the hydrogen-alkali airway holes, the alkali solution anode inlet holes and the alkali solution cathode inlet holes are all waist-shaped holes, round holes, strip-shaped holes or a combination of the above three shapes.

[0009] The oxygen-alkali gas channel groove and the hydrogen-alkali gas channel groove are axially symmetrically distributed with the vertical center line of the pole frame as the axis, and the alkali solution anode liquid inlet groove and the alkali solution cathode liquid inlet groove are axially symmetrically distributed with the vertical center line of the pole frame as the axis.

[0010] The opening shapes of the oxygen-alkali gas channel trough, the hydrogen-alkali gas channel trough, the alkali solution anode liquid inlet trough and the alkali solution cathode liquid inlet trough are all rectangular or trapezoidal.

[0011] The side of the pole frame is provided with an outer sealing area, a bipolar plate flow channel area and a tongue plate area connected to the outer periphery of the pole plate in sequence from its outer periphery to the inside. The oxygen and alkali air channel holes, oxygen and alkali air channel grooves, hydrogen and alkali flow channel seals, hydrogen and alkali air channel holes, hydrogen and alkali air channel grooves, oxygen and alkali flow channel seals, alkali liquid anode inlet holes, alkali liquid anode inlet grooves, alkali liquid cathode flow channel seals, alkali liquid cathode inlet holes, alkali liquid cathode inlet grooves and alkali liquid anode flow channel seals are all provided in the bipolar plate flow channel area.

[0012] The outer sealing area is located on the front and rear sides of the pole frame and has multiple circles of sealing water lines along the circumference. The opening shape of the sealing water line in the width direction is triangular, rectangular or a combination of the above two shapes.

[0013] A plurality of bipolar plate positioning holes are evenly spaced along the circumferential direction or symmetrically provided on the flow channel area of the bipolar plate, and positioning hole seals are provided on the outer periphery of both ends of the bipolar plate positioning holes.

[0014] The hydrogen-alkali flow channel seal, oxygen-alkali flow channel seal, alkali solution cathode flow channel seal, alkali solution anode flow channel seal and positioning hole seal are all multi-stage U-ring flow channel sealing structures in which the U-ring opening is connected to the sealing water line.

[0015] The U-annular flow channel sealing structure is coaxial at all levels and has equal spacing. The width direction of each level of the U-annular flow channel sealing structure is a groove shape with an opening shape of rectangle, trapezoid, triangle or a combination of the above three shapes.

[0016] The beneficial effects of the present invention are as follows: the flow channel sealed bipolar plate for the alkaline electrolytic cell of the present invention can provide multiple staggered alkali liquid circulation and distribution channels for each electrolysis chamber by arranging mutually staggered multi-channel hydrogen-alkali and oxygen-alkali air channel holes and mutually staggered hydrogen-alkali and oxygen-alkali air channel grooves, mutually staggered alkali liquid cathode and anode liquid inlet holes and mutually staggered alkali liquid cathode and anode liquid inlet grooves, so that the alkali liquid can quickly fill each electrolysis chamber, ensuring the uniformity of the alkali liquid concentration in each electrolysis chamber, and the gas-liquid two-phase flow field distribution in the electrolysis chamber is more uniform. The rising bubbles in the electrolysis chamber can be quickly discharged at the nearest outlet at the fastest speed, reducing gas accumulation, eliminating the gas dead zone of the electrolysis chamber, reducing the alkali liquid resistance voltage drop, thereby reducing the electrolysis energy consumption of the alkaline electrolytic cell and improving the electrolysis efficiency; at the same time, by arranging the corresponding flow channel sealing structure, the mutual crosstalk of hydrogen and oxygen in each electrolysis chamber is prevented, thereby improving the hydrogen and oxygen purity of the alkaline electrolytic cell, and ensuring the high safety, long life and stable operation of the alkaline electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the flow channel sealed bipolar plate for alkaline electrolytic cell of the present invention; Figure 2 yes Figure 1 AA cross-sectional schematic diagram of the flow channel sealing bipolar plate for alkaline electrolytic cell of the present invention; Figure 3 yes Figure 1 A partially enlarged schematic diagram of position I of the flow channel sealing bipolar plate for an alkaline electrolytic cell of the present invention; Figure 4 yes Figure 1 A partial enlarged schematic diagram of position II of the flow channel sealing bipolar plate for an alkaline electrolytic cell of the present invention; Figure 5 yes Figure 1A partial enlarged schematic diagram of position III of the flow channel sealing bipolar plate for an alkaline electrolytic cell of the present invention; Figure 6 Schematic diagram of the structure of the gas-liquid flow channel seal in the flow channel seal bipolar plate for alkaline electrolytic cell of the present invention; Figure 7 yes Figure 2 A partially enlarged schematic diagram of position IV of the flow channel sealing bipolar plate for an alkaline electrolytic cell of the present invention.

[0018] In the figure, 1. pole frame, 11. outer sealing area, 111. sealing waterline, 12. bipolar plate flow channel area, 13. tongue plate area, 14. flow channel seal, 141. gas-liquid flow channel seal, 141-1. hydrogen-alkali flow channel seal, 141-2. oxygen-alkali flow channel seal, 142. positioning hole seal, 143. alkali liquid flow channel seal, 143-1. alkali liquid cathode flow channel seal, 143-2. alkali liquid anode flow channel seal, 15. oxygen-alkali air channel hole, 16. oxygen-alkali air channel groove, 17. hydrogen-alkali air channel hole, 18. hydrogen-alkali air channel groove, 19. alkali liquid anode liquid inlet hole, 20. alkali liquid anode liquid inlet groove, 21. alkali liquid cathode liquid inlet hole, 22. alkali liquid cathode liquid inlet groove, 23. bipolar plate positioning hole, 2. pole plate. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1 The present invention provides a flow channel sealed bipolar plate for an alkaline electrolytic cell, such as Figure 1 、 Figure 2 As shown, the bipolar plate comprises a pole frame 1 and a pole plate 2. The pole frame 1 can be designed in a circular ring shape (or a square structure), and the pole plate 2 is designed in the shape of the pole frame 1. An outer sealing area 11 is designed on the outer periphery of both the front and back sides of the bipolar plate, followed inward by a bipolar plate flow channel area 12 and a tongue plate area 13.

[0021] The outer sealing area 11 is designed with sealing water lines 111. The number of sealing water lines 111 is determined by the layout. The shape of the sealing water lines 111 can be triangular, rectangular, or a combination of the two forms. There are 10 bipolar plate sealing water lines 111. The cross-sectional shapes of the sealing water lines 111 are triangular, rectangular, or a combination of the two forms.

[0022] like Figures 3 to 5As shown, the upper part of the bipolar plate flow channel area 12 is provided with a plurality of oxygen-alkali air channel holes 15, oxygen-alkali air channel grooves 16, hydrogen-alkali air channel holes 17, hydrogen-alkali air channel grooves 18 and a gas-liquid flow channel seal 141; the lower part of the bipolar plate is provided with an alkali liquid anode inlet hole 19, an alkali liquid anode inlet groove 20, an alkali liquid cathode inlet hole 21, an alkali liquid cathode inlet groove 22 and an alkali liquid flow channel seal 143; the bipolar plate flow channel area 12 is provided with bipolar plate positioning holes 23 and positioning hole seals 142 along the circumferential direction, and the gas-liquid flow channel seal 141, the alkali liquid flow channel seal 143 and the positioning hole seal 142 constitute the flow channel seal 14 structure of the present invention.

[0023] The upper portion of the bipolar plate flow channel region 12 is provided with a plurality of oxygen-alkali air passage holes 15 and hydrogen-alkali air passage holes 17. These holes are symmetrically distributed about the vertical centerline of the bipolar plate, with designed distribution angles δ1=δ3, δ2=δ4, …, δn=δn+1, and are staggered within the bipolar plate flow channel region 12. The plurality of oxygen-alkali air passage holes 15 and hydrogen-alkali air passage holes 17 can be designed to be distributed in an even or odd number within the bipolar plate flow channel region 12, depending on the bipolar plate diameter. The plurality of oxygen-alkali air passage holes 15 and hydrogen-alkali air passage holes 17 are all through holes, extending through the bipolar plate flow channel region. The cross-sections of the oxygen-alkali air passage holes 15 and hydrogen-alkali air passage holes 17 can be designed to have shapes such as waist-round holes, round holes, or strip holes, or a combination of these shapes.

[0024] The upper half of the bipolar plate flow channel region 12 is designed with oxygen-alkali gas channel grooves 16 and hydrogen-alkali gas channel grooves 18, corresponding to the oxygen-alkali gas channel holes 15 and hydrogen-alkali gas channel holes 17, respectively. The oxygen-alkali gas channel grooves 16 and hydrogen-alkali gas channel grooves 18 are also symmetrically distributed about the vertical center of the bipolar plate. The distribution angles are the same as those of the oxygen-alkali gas channel holes 15 and hydrogen-alkali gas channel holes 17, δ1=δ3, δ2=δ4, ..., δn=δn+1, and they are staggered on the front and back surfaces of the bipolar plate flow channel region 12. The oxygen-alkali gas channel grooves 16 and hydrogen-alkali gas channel grooves 18 are connected to the corresponding oxygen-alkali gas channel holes 15 and hydrogen-alkali gas channel holes 17 on the front and back surfaces of the bipolar plate flow channel region 12 and do not penetrate the bipolar plate flow channel region 12. The oxygen-alkali gas channel grooves 16 and hydrogen-alkali gas channel grooves 18 can be designed as rectangles or trapezoids.

[0025] The upper half of the bipolar plate flow channel region 12 is designed with hydrogen-alkali flow channel seals 141-1 and 141-2, corresponding to the oxygen-alkali air channel holes 15 and hydrogen-alkali air channel holes 17, respectively. These seals 141-1 and 141-2 are also symmetrically distributed about the vertical center of the bipolar plate. Their distribution angles are the same as those of the oxygen-alkali air channel holes 15 and 17, with δ1=δ3, δ2=δ4, …, δn=δn+1, and they are staggered on the front and back surfaces of the bipolar plate flow channel region 12. The hydrogen-alkali flow channel seals 141-1 and 141-2 are designed on the back side of the bipolar plate flow channel region 12, relative to the corresponding oxygen-alkali air channel grooves 16 and 18.

[0026] The hydrogen-alkali flow channel seal 141-1 and the oxygen-alkali flow channel seal 141-2 are respectively designed as a multi-stage U-annular flow channel sealing structure along the outer circumference of the oxygen-alkali air channel hole 15 and the hydrogen-alkali air channel hole 17. The multi-stage U-annular flow channel sealing structure is centered on the central axis of the oxygen-alkali air channel hole 15 and the hydrogen-alkali air channel hole 17. The U-annular flow channel sealing structures of each level are distributed in a U shape with the central axis. The U-annular flow channel sealing structures of each level are divided by the equally spaced sealing convex surface, and the sealing grooves of each level are distributed at equal intervals, such as Figure 6 As shown, the sealing convex surface of each level satisfies H1=H2=…=Hn, where H1=2mm, and the sealing groove of each level satisfies L1=L2=…=Ln, where L1=2mm. The cross section of the sealing groove of each level can be designed as a rectangle, trapezoid or triangle or a combination of several forms, such as Figure 7 As shown, the cross-section of each level of sealing groove is rectangular.

[0027] In addition, the lower half of the bipolar plate flow channel area 12 is provided with multiple alkaline liquid anode inlet holes 19 and alkaline liquid cathode inlet holes 21. The alkaline liquid anode inlet holes 19 and alkaline liquid cathode inlet holes 21 are symmetrically distributed with respect to the vertical centerline of the bipolar plate. Each alkaline liquid anode inlet hole 19 and alkaline liquid cathode inlet hole 21 is designed on the extension line of the centerline of each oxygen-alkali gas channel hole 15 and hydrogen-alkali gas channel hole 17 through the center of the bipolar plate, corresponding to the oxygen-alkali gas channel hole 15 and hydrogen-alkali gas channel hole 17, and staggeredly distributed in the bipolar plate flow channel area 12. The multiple alkaline liquid anode inlet holes 19 and alkaline liquid cathode inlet holes 21 can be designed to be distributed in an even number or an odd number in the bipolar plate flow channel area 12 according to the diameter of the bipolar plate. The multiple alkaline liquid anode inlet holes 19 and alkaline liquid cathode inlet holes 21 are all through holes that extend through the bipolar plate flow channel area 12. The cross sections of the multiple alkali solution anode inlet holes 19 and the alkali solution cathode inlet holes 21 can be designed to be waist-shaped holes, round holes, strip-shaped holes, or a combination of several shapes.

[0028] The lower half of the bipolar plate flow channel region 12 is designed with an alkali liquid anode inlet groove 20 and an alkali liquid cathode inlet groove 22, corresponding to the alkali liquid anode inlet hole 19 and the alkali liquid cathode inlet hole 21, respectively. The alkali liquid anode inlet groove 20 and the alkali liquid cathode inlet groove 22 are also symmetrically distributed about the vertical center of the bipolar plate. Each alkali liquid anode inlet groove 20 and the alkali liquid cathode inlet groove 22 are designed on the extension line of the center line of each oxygen-alkali gas channel hole 15 and hydrogen-alkali gas channel hole 17 through the center of the bipolar plate, corresponding to the oxygen-alkali gas channel hole 15 and the hydrogen-alkali gas channel hole 17, and are staggered on the front and back sides of the bipolar plate flow channel region 12. The alkali liquid anode inlet groove 20 and the alkali liquid cathode inlet groove 22 are connected to the corresponding alkali liquid anode inlet hole 19 and alkali liquid cathode inlet hole 21 on the front and back sides of the bipolar plate flow channel region 12, and do not penetrate the bipolar plate flow channel region 12. The cross-sections of the alkali solution anode inlet tank 20 and the alkali solution cathode inlet tank 22 can be designed to be rectangular or trapezoidal.

[0029] The lower half of the bipolar plate flow channel area 12 is designed with an alkali solution cathode flow channel seal 143-1 and an alkali solution anode flow channel seal 143-2, corresponding to the alkali solution anode inlet hole 19 and the alkali solution cathode inlet hole 21. The alkali solution cathode flow channel seal 143-1 and the alkali solution anode flow channel seal 143-2 are also symmetrically distributed about the vertical center of the bipolar plate. Each alkali solution cathode flow channel seal 143-1 and alkali solution anode flow channel seal 143-2 is designed on the extension line of the center line of each oxygen-alkali gas channel hole 15 and hydrogen-alkali gas channel hole 17 through the center of the bipolar plate, and is staggered on the front and back sides of the bipolar plate flow channel area 12. The alkali solution cathode flow channel seal 143-1 and alkali solution anode flow channel seal 143-2 are designed on the back side of the bipolar plate flow channel area 12, corresponding to the alkali solution anode inlet groove 20 and alkali solution cathode inlet groove 22.

[0030] Similarly, the alkaline solution cathode flow channel seal 143-1 and the alkaline solution anode flow channel seal 143-2 are U-annular flow channel seal structures, which have the same principle as the hydrogen-alkali flow channel seal 141-1 and the oxygen-alkali flow channel seal 141-2.

[0031] The bipolar plate flow channel area 12 is provided with bipolar plate positioning holes 23 along the circumference and positioning hole seals 142 are provided on both the front and back sides. The number of bipolar plate positioning holes 23 can be 3 or 4. The number of positioning hole seals 142 depends on the number of bipolar plate positioning holes 23, which is also 3 or 4. The bipolar plate positioning holes 23 are distributed in a 360° circular array along the bipolar plate flow channel area 12.

[0032] Similarly, the positioning hole seal 142 also has a U-annular flow channel sealing structure, and has the same principle as the hydrogen-alkali flow channel seal 141-1 and the oxygen-alkali flow channel seal 141-2.

[0033] In the tongue plate area 13 , the pole frame 1 and the pole plate 2 can be integrated into an integral structure by welding, injection molding or mechanical pressing to form a bipolar plate for an alkaline electrolytic cell.

[0034] During operation, based on the working principle of liquid inlet at the bottom and gas outlet at the top of the alkaline electrolytic cell, alkali solution is simultaneously introduced through multiple alkali solution anode inlet holes 19 and alkali solution cathode inlet holes 21 in the lower half of the pole frame 1. When the alkali solution flows through the front / front face of the bipolar plate flow channel area 12 of the pole frame 1, the alkali solution in the alkali solution anode inlet hole 19 enters the front face of the pole plate 2, i.e., the anode face, through the alkali solution anode inlet tank 20 radially through the tongue plate area 13, and an oxygen evolution reaction occurs to generate oxygen. At the same time, the alkali solution cathode flow channel seal 143-1 on the back face of the bipolar plate flow channel area 12 prevents the hydrogen generated on the cathode face of the pole plate 2 from entering the front face of the bipolar plate flow channel area 12 through the alkali solution anode inlet hole 19. The generated oxygen quickly rises along the anode surface of the electrode plate 2 to the upper half of the electrode frame 1, and flows into the oxygen-alkali air channel hole 15 through the oxygen-alkali air channel groove 16 on the front side of the tongue plate area 13. At the same time, the hydrogen-alkali flow channel seal 141-1 on the back side of the bipolar plate flow channel area 12 prevents hydrogen from mixing into the oxygen-alkali air channel hole 15; when the alkali solution flows through the back side / back of the bipolar plate flow channel area 12 of the electrode frame 1, the alkali solution in the alkali solution cathode liquid inlet hole 21 enters the back side, i.e., the cathode side, of the electrode plate 2 through the alkali solution cathode liquid inlet groove 22 in the radial direction through the tongue plate area 13, and a hydrogen evolution reaction occurs to generate hydrogen. At the same time, the alkali solution anode flow channel seal 143-2 on the front side of the bipolar plate flow channel area 12 prevents the oxygen generated on the anode surface of the electrode plate 2 from entering the back side of the bipolar plate flow channel area 12 through the alkali solution cathode liquid inlet hole 21. The generated hydrogen rises rapidly along the cathode surface of the electrode plate 2 to the upper half of the electrode frame 1, then flows through the back of the tongue plate area 13 and into the hydrogen-alkali gas channel groove 18, entering the hydrogen-alkali gas channel hole 17. Simultaneously, the oxygen-alkali flow channel seal 141-2 on the front of the bipolar plate flow channel area 12 prevents oxygen from entering the hydrogen-alkali gas channel hole 17. During this process, the sealing waterline 111 of the outer sealing area 11 of the electrode frame 1 provides an overall seal for the electrolysis chamber, and the positioning hole seals 142 on both sides of the bipolar plate positioning hole 23 provide front and rear barriers at the positioning hole location.

[0035] Through the above-mentioned manner, the flow channel sealed bipolar plate for the alkaline electrolytic cell of the present invention is provided with mutually staggered multi-channel hydrogen-alkali and oxygen-alkali air channel holes and mutually staggered hydrogen-alkali and oxygen-alkali air channel grooves, mutually staggered alkali solution cathode and anode liquid inlet holes and mutually staggered alkali solution cathode and anode liquid inlet grooves, which can provide multiple staggered distributed alkali solution circulation and distribution channels for each electrolysis chamber, so that the alkali solution quickly fills each electrolysis chamber, ensuring the uniformity of the alkali solution concentration in each electrolysis chamber, and the gas-liquid two-phase flow field distribution in the electrolysis chamber is more uniform. The rising bubbles in the electrolysis chamber can be quickly discharged at the nearest outlet at the fastest speed, reducing gas accumulation, eliminating the gas dead zone of the electrolysis chamber, and reducing the alkali solution resistance voltage drop, thereby reducing the electrolysis energy consumption of the alkaline electrolytic cell and improving the electrolysis efficiency; at the same time, by providing the corresponding flow channel sealing structure, the cross-talk of hydrogen and oxygen in each electrolysis chamber is prevented, thereby improving the hydrogen and oxygen purity of the alkaline electrolytic cell, and ensuring the high safety, long life and stable operation of the alkaline electrolytic cell.

[0036] Example 2 On the basis of Example 1, according to the diameter of the alkaline electrolytic cell, the alkaline electrolytic cell uses a flow channel to seal the bipolar plate, and only a gas-liquid flow channel sealing structure is provided in the flow channel area of the bipolar plate.

[0037] Example 3 On the basis of Example 1, according to the diameter of the alkaline electrolytic cell, the alkaline electrolytic cell uses a flow channel to seal the bipolar plate, and a flow channel sealing structure and a positioning hole sealing structure are deformably provided in the flow channel area of the bipolar plate.

[0038] Example 4 On the basis of Example 1, according to the diameter of the alkaline electrolytic cell, the alkaline electrolytic cell uses a flow channel to seal the bipolar plate, and a flow channel sealing structure and an alkaline solution sealing structure are deformably provided in the flow channel area of the bipolar plate.

[0039] Example 5 On the basis of Example 1, according to the diameter of the alkaline electrolytic cell, the alkaline electrolytic cell uses a flow channel to seal the bipolar plate, and a flow channel sealing structure and a partial alkali liquid sealing structure can be deformed in the flow channel area of the bipolar plate. If the alkali liquid sealing structure is not set, an alkali liquid anode inlet tank and an alkali liquid cathode inlet tank can be set at the same position on the front and back sides of the bipolar plate.

[0040] Example 6 On the basis of Example 1, according to the diameter of the alkaline electrolytic cell, the alkaline electrolytic cell uses a flow channel to seal the bipolar plate, and the positioning holes and the positioning hole sealing structure can be removed in the flow channel area of the bipolar plate.

Claims

1. A flow channel sealed bipolar plate for an alkaline electrolytic cell, characterized in that: The invention comprises a pole plate and a pole frame at the periphery, wherein a plurality of staggered oxygen, hydrogen and alkali air duct holes are evenly spaced along the circumference on the upper part of the pole frame, an oxygen and alkali air duct groove connected to the oxygen and alkali air duct hole is provided near one end of the anode surface of the pole plate, and a hydrogen and alkali flow channel seal is provided near one end of the cathode surface of the pole plate; a hydrogen and alkali air duct groove connected to the hydrogen and alkali air duct hole is provided near one end of the cathode surface of the pole plate, and an oxygen and alkali flow channel seal is provided near one end of the anode surface of the pole plate; a plurality of staggered alkali liquid anode and cathode liquid inlet holes are evenly spaced along the circumference on the lower part of the pole frame, the alkali liquid anode liquid inlet hole is provided with an alkali liquid anode liquid inlet groove connected to the alkali liquid anode liquid inlet hole near one end of the anode surface of the pole plate, and an alkali liquid cathode flow channel seal is provided near one end of the cathode surface of the pole plate; an alkali liquid cathode liquid inlet hole is provided with an alkali liquid cathode liquid inlet groove connected to the alkali liquid anode liquid inlet hole near one end of the cathode surface of the pole plate, and an alkali liquid anode flow channel seal is provided near one end of the anode surface of the pole plate.

2. The flow channel sealed bipolar plate for an alkaline electrolytic cell according to claim 1, wherein: The oxygen-alkali airway holes and the hydrogen-alkali airway holes are axially symmetrically distributed with the vertical center line of the pole frame as the axis, the alkali solution anode inlet hole and the alkali solution cathode inlet hole are axially symmetrically distributed with the vertical center line of the pole frame as the axis, the line connecting the center line of the oxygen-alkali airway holes and the center line of the alkali solution anode inlet hole passes through the center point of the pole plate, and the line connecting the center line of the hydrogen-alkali airway holes and the center line of the alkali solution cathode inlet hole passes through the center point of the pole plate.

3. The flow channel sealed bipolar plate for an alkaline electrolytic cell according to claim 1 or 2, wherein: The oxygen-alkali airway holes, hydrogen-alkali airway holes, alkali solution anode inlet holes and alkali solution cathode inlet holes are all waist-shaped holes, round holes, strip-shaped holes or a combination of the above three shapes.

4. The flow channel sealed bipolar plate for an alkaline electrolytic cell according to claim 2, wherein: The oxygen-alkali airway groove and the hydrogen-alkali airway groove are axially symmetrically distributed with the vertical center line of the pole frame as the axis, and the alkali solution anode liquid inlet groove and the alkali solution cathode liquid inlet groove are axially symmetrically distributed with the vertical center line of the pole frame as the axis.

5. The flow channel sealed bipolar plate for an alkaline electrolytic cell according to claim 1 or 4, characterized in that: The opening shapes of the oxygen-alkali airway groove, the hydrogen-alkali airway groove, the alkali solution anode inlet groove and the alkali solution cathode inlet groove are all rectangular or trapezoidal.

6. The flow channel sealed bipolar plate for an alkaline electrolytic cell according to claim 1, wherein: The side of the pole frame is provided with an outer sealing area, a bipolar plate flow channel area and a tongue plate area connected to the outer periphery of the pole plate in sequence from its outer periphery to the inside, and the oxygen and alkali air channel holes, oxygen and alkali air channel grooves, hydrogen and alkali flow channel seals, hydrogen and alkali air channel holes, hydrogen and alkali air channel grooves, oxygen and alkali flow channel seals, alkali liquid anode inlet holes, alkali liquid anode inlet grooves, alkali liquid cathode flow channel seals, alkali liquid cathode inlet holes, alkali liquid cathode inlet grooves and alkali liquid anode flow channel seals are all provided in the bipolar plate flow channel area.

7. The flow channel sealed bipolar plate for an alkaline electrolytic cell according to claim 6, wherein: The outer sealing area is located on both the front and rear sides of the pole frame and has multiple circles of sealing water lines circumferentially opened. The opening shape of the sealing water line width direction is triangular, rectangular or a combination of the above two shapes.

8. The flow channel sealed bipolar plate for an alkaline electrolytic cell according to claim 7, wherein: A plurality of bipolar plate positioning holes are evenly spaced along the circumferential direction or symmetrically formed on the bipolar plate flow channel area, and positioning hole seals are provided on the outer peripheries of both ends of the bipolar plate positioning holes.

9. The flow channel sealed bipolar plate for an alkaline electrolytic cell according to claim 8, wherein: The hydrogen-alkali flow channel seal, oxygen-alkali flow channel seal, alkali solution cathode flow channel seal, alkali solution anode flow channel seal and positioning hole seal are all multi-stage U-ring flow channel sealing structures in which the U-ring opening is connected to the sealing water line.

10. The flow channel sealed bipolar plate for an alkaline electrolytic cell according to claim 9, wherein: The U-annular flow channel sealing structure is coaxial at all levels and has equal spacing. The width direction of each level of the U-annular flow channel sealing structure is a groove shape with an opening shape of rectangle, trapezoid, triangle or a combination of the above three shapes.

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