Bipolar plate for alkaline electrolytic bath

Abstract

The utility model belongs to the technical field of bipolar plates, and discloses a bipolar plate for an alkaline electrolytic bath, which comprises a bipolar plate, a through groove is arranged in the middle of the surface of the bipolar plate, a middle polar plate is arranged in the through groove, a ceramic coating is arranged on the surface of the middle polar plate, and a plurality of guide pipes are arranged on the middle polar plate. The surface of the conduit is provided with a convex block, a sealing ring is arranged between the bipolar plate and the middle polar plate, the top of the bipolar plate is provided with a lead-in frame, an alkali inlet is formed in the lead-in frame, one side of the surface of the bipolar plate is provided with a hydrogen inlet, and the other side of the surface of the bipolar plate is provided with an oxygen inlet. The ceramic coating is arranged on the surface of the middle polar plate, the ceramic coating can reduce corrosion to the bipolar plate in the electrolysis process of the electrolytic cell, and in the electrolysis process, because the outer surface of the bipolar plate is insulated and the interior of the bipolar plate is conductive, a wiring board can be placed on the bipolar plate, and the short circuit phenomenon between electrodes cannot occur.

Description

Technical Field

[0001] The utility model belongs to the technical field of bipolar plates, in particular to a bipolar plate for an alkaline electrolytic cell. Background Art

[0002] The plates of alkaline electrolyzers are the electron carriers of the positive and negative electrodes of the electrolytic chamber. They are also the parts that come into contact with the alkali, electrodes, and catalyst surfaces. The quality of the plate structure design and installation conditions directly affect the current density and energy consumption of the electrolyzer.

[0003] For example, the utility model with the publication number CN220335316U discloses an integrated alkaline electrolytic cell bipolar plate, including a bipolar plate body, an intermediate plate arranged at the center of the bipolar plate body, a plurality of plate bosses arranged on the intermediate plate, an alkali liquid flow field distributed between the plate bosses, a plate frame arranged around the outer periphery of the intermediate plate, and an alkali liquid inlet, a hydrogen outlet and an oxygen outlet arranged on the plate frame. The utility model adopts an integrated alkaline electrolytic cell bipolar plate of the above structure, which does not require the plate frame to be circled, shaped and the intermediate plate to be welded, thereby reducing the machining difficulty and production cost; the raw material plate is directly processed by milling and turning, and the cycle is short; the intermediate plate is integrally stamped, and the contact surface with the electrode component is larger and more solid; the alkali liquid flow field area on the intermediate plate is relatively wide, and the alkali liquid flows through the linearly arranged plate bosses on the intermediate plate, and the flow channel is smoother, which reduces the contact resistance and improves the current density.

[0004] During the electrolysis process in the electrolytic cell, the bipolar plate is easily corroded, resulting in a short circuit. When the electrolyte flows inside the bipolar plate, the contact area is small and the fluidity effect is poor, resulting in a decrease in conductivity. Therefore, a bipolar plate for an alkaline electrolytic cell is proposed to address the above problems. Utility Model Content

[0005] In order to solve the problems raised in the above-mentioned background technology, the utility model provides a bipolar plate for an alkaline electrolytic cell, which can solve the problem that the bipolar plate is easily corroded during the electrolysis process in the electrolytic cell, resulting in a short circuit, and when the electrolyte flows inside the bipolar plate, the contact area is small and the fluidity effect is poor, resulting in a decrease in conductivity.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a bipolar plate for an alkaline electrolytic cell, comprising a bipolar plate, a through groove is opened in the middle of the surface of the bipolar plate, an intermediate plate is arranged inside the through groove, a ceramic coating is arranged on the surface of the intermediate plate, a plurality of conduits are arranged on the intermediate plate, a bump is arranged on the surface of the conduit, and a sealing ring is arranged between the bipolar plate and the intermediate plate.

[0007] Preferably, an introduction frame is provided on the top of the bipolar plate, and an alkali inlet is provided inside the introduction frame.

[0008] Preferably, a hydrogen inlet is provided on one side of the surface of the bipolar plate, and an oxygen inlet is provided on the other side of the surface of the bipolar plate.

[0009] Preferably, the sealing ring is located at the connection between the bipolar plate and the intermediate plate, and the size of the sealing ring is adapted to the size of the intermediate plate.

[0010] Preferably, positioning plates are fixedly mounted on both sides of the surface of the bipolar plate, and positioning grooves are provided on both sides of the surface of the positioning plate.

[0011] Preferably, a positioning bolt penetrates the internal thread of the positioning groove, the size of the positioning bolt matches the size of the positioning groove, and the positioning bolt fixes the limiting plate.

[0012] Preferably, the ceramic coating is made of metal ceramic, and the metal ceramic has insulating properties.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] The utility model arranges a ceramic coating on the surface of the intermediate plate, and during the electrolysis process of the electrolytic cell, the ceramic coating can reduce the corrosion of the bipolar plate, and during the electrolysis process, since the outer surface of the bipolar plate is insulated and the inner part is conductive, a terminal plate can be placed on the bipolar plate without causing a short circuit between the electrodes.

[0015] The utility model arranges the intermediate plate, the conduit and the convex block, the conduit and the interior of the intermediate plate are through-connected, the interior of the convex block is hollowed out, and a flow channel is formed inside the intermediate plate. After the electrolyte enters the intermediate plate, it needs to pass through many curved gaps between the conduits and the intermediate plate, which is beneficial to enhancing the disturbance degree of the flow, reducing the electrolyte concentration difference at various places in the flow channel, and making the electrolyte distribution more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the split structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the intermediate plate of the utility model;

[0019] Figure 4 This is a schematic diagram of the bipolar plate structure of the utility model.

[0020] In the figure: 1. bipolar plate; 2. intermediate plate; 3. ceramic coating; 4. conduit; 5. bump; 6. sealing ring; 7. introduction frame; 8. positioning plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figures 1 to 4 As shown, the utility model provides a bipolar plate for an alkaline electrolytic cell, including a bipolar plate 1, a through groove is opened in the middle of the surface of the bipolar plate 1, an intermediate plate 2 is arranged inside the through groove, a ceramic coating 3 is arranged on the surface of the intermediate plate 2, a plurality of conduits 4 are arranged on the intermediate plate 2, a bump 5 is arranged on the surface of the conduit 4, and a sealing ring 6 is arranged between the bipolar plate 1 and the intermediate plate 2.

[0023] During the electrolysis process of the electrolytic cell, the ceramic coating 3 can reduce the corrosion of the bipolar plate 1. In addition, since the outer surface of the bipolar plate 1 is insulated and the inside is conductive, the terminal plate can be placed on the bipolar plate 1 without short circuit between the electrodes. The conduit 4 and the inside of the intermediate plate 2 are through-connected, and the inside of the protrusion 5 is hollow, forming a flow channel inside the intermediate plate 2. After entering the intermediate plate 2, the electrolyte needs to pass through many curved gaps between the conduit 4 and the intermediate plate 2, which is conducive to enhancing the disturbance of the flow, reducing the electrolyte concentration difference at various locations in the flow channel, and making the electrolyte distribution more uniform.

[0024] like Figures 1 to 4 As shown, an introduction frame 7 is provided on the top of the bipolar plate 1, an alkali inlet is provided inside the introduction frame 7, a hydrogen inlet is provided on one side of the surface of the bipolar plate 1, and an oxygen inlet is provided on the other side of the surface of the bipolar plate 1. The sealing ring 6 is located at the connection between the bipolar plate 1 and the intermediate plate 2, and the size of the sealing ring 6 is adapted to the size of the intermediate plate 2.

[0025] By setting the alkali inlet, hydrogen inlet and oxygen inlet, when the bipolar plate 1 is used, the electrolyte will enter the interior of the bipolar plate 1 through the alkali inlet. After entering the interior of the bipolar plate 1, the decomposed oxygen and hydrogen will be discharged to both sides of the bipolar plate 1 through the hydrogen inlet and the oxygen inlet respectively. In addition, the sealing ring 6 is set at the connection between the intermediate plate 2 and the bipolar plate 1, thereby improving the sealing between the intermediate plate 2 and the bipolar plate 1.

[0026] like Figures 1 to 4As shown, positioning plates 8 are fixedly installed on both sides of the surface of the bipolar plate 1, and positioning grooves are opened on both sides of the surface of the positioning plate 8. The internal threads of the positioning grooves are penetrated by positioning bolts. The size of the positioning bolts is adapted to the size of the positioning grooves. The positioning bolts fix the limit plates 8. The material of the ceramic coating 3 is metal ceramics, which have insulating properties.

[0027] Personnel will install the bipolar plate 1 through the positioning bolts on the limit plate 8. After installation, the ceramic coating 3 will protect the intermediate plate 2, reduce the corrosion of the intermediate plate 2 by the liquid inside the electrolytic cell, and avoid the liquid entering the intermediate plate 2, causing the intermediate plate 2 to short-circuit.

[0028] The working principle and use process of the utility model are as follows: during the electrolysis process of the electrolytic cell, the ceramic coating 3 can reduce the corrosion of the bipolar plate 1, and since the outer surface of the bipolar plate 1 is insulated and the inner part is conductive during the electrolysis process, the terminal plate can be placed on the bipolar plate 1 without short circuit between the electrodes, and the conduit 4 and the inner part of the intermediate plate 2 are through-connected, the inner part of the protrusion 5 is hollow, and a flow channel is formed inside the intermediate plate 2. After the electrolyte enters the intermediate plate 2, it needs to pass through many curved gaps between the conduit 4 and the intermediate plate 2, which is conducive to enhancing the disturbance degree of the flow, reducing the electrolyte concentration difference at various places in the flow channel, and making the electrolyte distribution more uniform.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bipolar plate for an alkaline electrolytic cell, comprising a bipolar plate (1), characterized in that: A through groove is provided in the middle of the surface of the bipolar plate (1), an intermediate plate (2) is provided inside the through groove, a ceramic coating (3) is provided on the surface of the intermediate plate (2), a plurality of conduits (4) are provided on the intermediate plate (2), a bump (5) is provided on the surface of the conduit (4), and a sealing ring (6) is provided between the bipolar plate (1) and the intermediate plate (2).

2. The bipolar plate for alkaline electrolytic cell according to claim 1, characterized in that: An introduction frame (7) is provided on the top of the bipolar plate (1), and an alkali inlet is provided inside the introduction frame (7).

3. The bipolar plate for alkaline electrolytic cell according to claim 1, characterized in that: A hydrogen inlet is provided on one side of the surface of the bipolar plate (1), and an oxygen inlet is provided on the other side of the surface of the bipolar plate (1).

4. The bipolar plate for alkaline electrolytic cell according to claim 1, characterized in that: The sealing ring (6) is located at the connection between the bipolar plate (1) and the intermediate plate (2), and the size of the sealing ring (6) is adapted to the size of the intermediate plate (2).

5. The bipolar plate for alkaline electrolytic cell according to claim 1, characterized in that: Positioning plates (8) are fixedly mounted on both sides of the surface of the bipolar plate (1), and positioning grooves are provided on both sides of the surface of the positioning plate (8).

6. The bipolar plate for alkaline electrolytic cell according to claim 5, characterized in that: A positioning bolt is passed through the internal thread of the positioning groove, the size of the positioning bolt matches the size of the positioning groove, and the positioning bolt fixes the positioning plate (8).

7. The bipolar plate for alkaline electrolytic cell according to claim 1, characterized in that: The material of the ceramic coating (3) is metal ceramic, and the metal ceramic has insulating properties.

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