Bipolar plate, electrolysis cell and hydrogen production electrolytic cell

Abstract

The invention provides a bipolar plate, a small electrolysis chamber and a hydrogen production electrolytic tank. The bipolar plate is provided with a plurality of water flow inlets and outlets in the two sides in the length direction, and is provided with a plurality of first hydrogen outlets in the two sides in the width direction; water path distribution areas are arranged on the two sides of the side face of the anode in the width direction, the water path runner area is arranged between the water path distribution areas on the two sides and communicates with the water path distribution areas, and water path sealing areas are arranged on the peripheral sides of the water path distribution areas. The waterway runner area comprises a plurality of waterway runners; hydrogen distribution areas are arranged on the two sides of the side face of the cathode in the width direction, a hydrogen flow channel area is formed between the hydrogen distribution areas on the two sides, the hydrogen flow channel area is a light plate groove, and hydrogen sealing areas are arranged on the peripheral sides of the hydrogen distribution areas. According to the invention, the transmission uniformity of water vapor and the resistance of charge transmission can be considered, the sealing performance can be ensured, the supporting force and the extrusion force can be met in the stacking process, and the gas diffusion layer and the membrane electrode are prevented from being damaged by the extrusion force.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production equipment, and in particular to a bipolar plate, an electrolysis chamber and a hydrogen production electrolytic cell. Background Art

[0002] The electrolytic cell consists of a cell body, an anode and a cathode, and most of them are separated by a diaphragm to separate the anode chamber and the cathode chamber. When direct current passes through the electrolytic cell, an oxidation reaction occurs at the interface between the anode and the solution, and a reduction reaction occurs at the interface between the cathode and the solution to produce the desired product. The bipolar cell is composed of a number of electrolytic chambers connected in series to form a whole. There is an electrolytic chamber between every two plates. The electrolytic chamber is composed of end plates, anode chambers, cathode chambers, bipolar plates, diaphragms and other components. During the water electrolysis process, the cathode and cathode chambers will continuously produce gas. If the bipolar plate structure is not set reasonably, it will be unfavorable for the uniform diffusion of the electrolyte and the smooth output of the product.

[0003] In the prior art, some bipolar plates have flow channels on both sides. In this case, the carbon paper on the cathode side is easily squeezed and invades the flow channel under a higher stacking pressure, resulting in obstruction of gas discharge. Others have plain plates on both sides, which require titanium mesh, titanium felt, etc. to form the flow channel, increasing the complexity of assembly and processing. Summary of the invention

[0004] The present invention provides a bipolar plate, an electrolysis chamber and a hydrogen production electrolytic cell, which are used to solve the defects in the prior art that the electrolyte cannot be evenly diffused and the product cannot be smoothly output, so as to achieve better output of the product.

[0005] The present invention provides a bipolar plate, comprising a body, wherein the body is provided with a plurality of water inlets and outlets on both sides along the length direction, and a plurality of first hydrogen outlets on both sides along the width direction, and the body is provided with an anode side and a cathode side on both sides in the thickness direction; On the side of the anode, water channel distribution areas are arranged on both sides along the width direction, a water channel flow area is arranged between the water channel distribution areas on both sides and is connected to the water channel distribution areas, and a water channel sealing area is arranged around the water channel distribution area; the water channel flow area includes a plurality of water channel flow areas; On the cathode side, hydrogen distribution areas are arranged on both sides along the width direction, and a hydrogen flow channel area is opened between the hydrogen distribution areas on both sides. The hydrogen flow channel area is a light plate groove, and a hydrogen sealing area is arranged around the hydrogen distribution area.

[0006] According to a bipolar plate provided by the present invention, the porosity of the water channel region is a, 40%≤a≤60%, and the width of the water channel is b, b≤1 mm.

[0007] According to a bipolar plate provided by the present invention, the water channel sealing area and the hydrogen sealing area are both sealed with glue lines to form a soft supporting structure.

[0008] According to a bipolar plate provided by the present invention, the water channel distribution area is formed by cutting grooves or cover plate grooves to be flush with the water channel flow channel area.

[0009] The present invention also provides an electrolysis chamber, comprising a pair of bipolar plates as described above, wherein the anode side and the cathode side of the pair of bipolar plates are arranged opposite to each other; The anode diffusion layer, the membrane electrode and the cathode diffusion layer are arranged between a pair of the bipolar plates, and the anode diffusion layer is arranged close to the anode side, and the cathode diffusion layer is arranged close to the cathode side.

[0010] The present invention also provides a hydrogen production electrolyzer, comprising: Positive terminal plate; A positive electrode insulating plate, arranged on the top of the positive terminal plate; A positive electrode current collecting plate, disposed on the positive electrode insulating plate; The electrolytic cell circulation chamber is formed by connecting a plurality of the electrolytic cells described above in series; the electrolytic cell circulation chamber is arranged on the positive electrode current collecting plate; A negative electrode current collecting plate is arranged on the circulation chamber of the electrolytic cell; A negative electrode insulating plate, disposed on the negative electrode current collecting plate; A negative terminal plate, disposed on the negative insulating plate; The water channel manifold is arranged on the negative terminal plate.

[0011] According to a hydrogen production electrolyzer provided by the present invention, a water inlet is arranged on the side of the negative terminal plate, and the water inlet is connected to the water manifold; a plurality of water distribution ports and water sealing grooves are opened on both sides along the length direction of the negative insulating plate, and the water distribution ports perform secondary water distribution; a plurality of second hydrogen outlets and hydrogen sealing grooves are opened on both sides along the width direction of the negative insulating plate.

[0012] According to a hydrogen production electrolyzer provided by the present invention, sealing glue wires are placed in the hydrogen sealing groove and the water channel sealing groove for sealing.

[0013] According to a hydrogen production electrolyzer provided by the present invention, a cathode purge drain port is provided on the positive terminal plate.

[0014] According to a hydrogen production electrolyzer provided by the present invention, an anode purge drain port is provided on the positive terminal plate.

[0015] The bipolar plate provided by the present invention is provided with a plurality of water inlets and outlets on both sides of the body along the length direction, a plurality of hydrogen outlets on both sides along the width direction, and the two sides in the thickness direction are respectively the anode side and the cathode side. On the anode side, a water channel distribution area is provided on both sides in the width direction, a water channel flow area is provided between the water channel distribution areas on both sides and is connected to the water channel distribution areas, and a water channel sealing area is provided on the surrounding side of the water channel distribution area; the water channel flow area is a plurality of water channel flow areas, which improve the supporting effect of the anode diffusion layer while ensuring the contact resistance and diffusion; on the cathode side, a hydrogen distribution area is provided on both sides along the width direction, and a hydrogen flow channel area is provided between the hydrogen distribution areas on both sides, and the hydrogen flow channel area is a bare plate groove, which increases the contact area, reduces the resistance, and improves the performance of the electrolyzer. A hydrogen sealing area is provided on the surrounding side of the hydrogen distribution area.

[0016] The electrolysis chamber and hydrogen production electrolysis cell provided by the present invention, because they include the bipolar plates as described above, have the various advantages as described above.

[0017] In addition, the water inlet of the hydrogen production electrolyzer provided by the present invention is distributed on the side of the negative terminal plate, and the water inlet performs preliminary water flow distribution, and then the water flow after the preliminary water flow distribution passes through the water channel distribution port of the negative insulating plate for secondary water flow distribution, so as to achieve uniform distribution of the water inlet of each plate.

[0018] Moreover, a cathode purge drain port is arranged on the positive terminal plate, which is used for purging and draining to keep the cathode dry after the electrolytic cell is shut down. An anode purge drain port is arranged on the positive terminal plate, which is used for purging and draining to keep the anode dry after the electrolytic cell is shut down, thereby solving the problem of shutdown and storage of the electrolytic cell in an environment below 0°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the anode side of the bipolar plate provided by the present invention.

[0021] Figure 2 It is a structural schematic diagram of the cathode side of the bipolar plate provided by the present invention.

[0022] Figure 3 It is a structural schematic diagram of the water distribution area of ​​the bipolar plate provided by the present invention.

[0023] Figure 4 It is an exploded view of a single electrolysis chamber provided by the present invention.

[0024] Figure 5 It is a schematic diagram of the overall structure of the hydrogen production electrolyzer provided by the present invention.

[0025] Figure 6 It is a schematic structural diagram of the negative electrode insulating plate provided by the present invention.

[0026] Figure 7 A schematic structural diagram of a positive terminal plate provided by the present invention.

[0027] Reference numerals: 10. bipolar plate; 101. water inlet and outlet; 102. water distribution area; 103. water flow channel area; 104. first hydrogen outlet; 105. water channel sealing area; 106. hydrogen distribution area; 107. hydrogen flow channel area; 108. hydrogen sealing area; 11. Membrane electrode; 12. Cathode diffusion layer; 13. Anode diffusion layer; 1. Water channel manifold; 2. Negative terminal plate; 3. Negative insulating plate; 4. Negative current collecting plate; 5. Electrolyzer circulation chamber; 6. Positive current collecting plate; 7. Positive insulating plate; 8. Positive terminal plate; 31. Water channel distribution port; 32. Water channel sealing groove; 33. Second hydrogen outlet; 34. Hydrogen sealing groove; 81. Cathode purge drain port; 82. Anode purge drain port. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] Combine the following Figure 1-Figure 3 The bipolar plate provided by the embodiment of the first aspect of the present invention is described.

[0031] like Figure 1 and Figure 2 As shown, the bipolar plate 10 provided by the present invention includes a body, and the body is provided with water inlet and outlet 101 on both sides along the length direction, and multiple first hydrogen outlets 104 on both sides along the width direction. The two sides of the body in the thickness direction are respectively the anode side and the cathode side.

[0032] On the side of the anode, water channel distribution areas 102 are arranged on both sides along the width direction, and the water channel flow area 103 is arranged between the water channel distribution areas 102 on both sides, and the water channel flow area 103 is connected to the water channel distribution area 102, and the water channel flow area 103 includes multiple water channel flow channels. A water channel sealing area 105 is arranged on the peripheral side of the water channel distribution area 102, and the water channel sealing area 105 is used to prevent water from leaking to other areas of the fuel cell to ensure the stable operation of the system. The water channel flow area 103 includes multiple water channel flow channels, and the support effect of the anode diffusion layer is enhanced by increasing the number of water channel flow channels. Multiple water channel flow channels can provide more uniform support and reduce deformation and damage of the anode diffusion layer during operation. In other words, the setting of multiple water channel flow channels in the water channel flow area 103 can enhance the support effect of the anode diffusion layer while ensuring contact resistance and diffusion.

[0033] like Figure 2 As shown, on the cathode side, hydrogen distribution areas 106 are provided on both sides along the width direction, and a hydrogen flow channel area 107 is provided between the hydrogen distribution areas 106 on both sides. The hydrogen distribution area 106 receives hydrogen from the hydrogen supply source of the fuel cell system and distributes it evenly to the hydrogen flow channel area 107. The hydrogen flow channel area 107 is a bare plate groove, which generally refers to a smooth groove without additional structures or obstacles. This design increases the contact area between hydrogen and the cathode catalyst layer, which helps to improve the reaction efficiency. At the same time, the setting of the bare plate groove also reduces the resistance, making the flow of hydrogen in the flow channel smoother. In addition, by increasing the contact area and improving the structural strength, the hydrogen flow channel area 107 also improves the support of the cathode diffusion layer, protects the carbon paper, and allows it to be repeatedly disassembled and used without cutting or rupture, thereby improving the performance of the electrolyzer.

[0034] A hydrogen sealing area 108 is provided around the hydrogen distribution area 106 to prevent hydrogen from leaking to other parts of the fuel cell system. The hydrogen sealing area 108 ensures effective use of hydrogen and prevents potential safety hazards.

[0035] In a feasible embodiment provided by the present invention, the porosity of the water channel area 103 is a, wherein the porosity refers to the proportion of the flow channel area to the entire water channel area. The porosity a ranges from 40% ≤ a ≤ 60%, and the selection of this range is based on a comprehensive consideration of the water flow transmission efficiency, contact resistance, and the support effect of the anode diffusion layer. A higher porosity can provide a better water flow channel, which helps to evenly distribute and effectively transmit cooling water, but may sacrifice a certain support effect of the anode diffusion layer. On the contrary, a lower porosity can enhance the support of the anode diffusion layer, but may limit the transmission efficiency of the water flow. Therefore, a porosity range of 40% to 60% is a reasonable choice that weighs these factors.

[0036] The width of the water channel is b, b≤1mm. A smaller channel width can increase the number of channels, thereby providing more water flow channels, which is conducive to the uniform distribution of the electrolyte. In addition, while ensuring the contact resistance and diffusion, the support effect of the anode diffusion layer is improved, that is, the uniformity of water vapor transmission and the resistance of charge transmission are taken into account.

[0037] Furthermore, the opening rate of the water channel area 103 is about 50%, which reduces the channel width and increases the number of channels, thereby better improving the support of the bipolar plate to the titanium felt and better protecting the membrane electrode when operating under high pressure.

[0038] Therefore, the reasonable porosity and channel width design ensures the uniform distribution and effective transmission of cooling water on the anode side, which helps to maintain the operating temperature of the fuel cell within a suitable range. At the same time, it also helps to evenly distribute and transmit hydrogen, improving the reaction efficiency of the fuel cell. Increasing the contact area between the channel wall and the anode diffusion layer and the reasonable porosity design enhance the support effect of the anode diffusion layer, which helps to prevent deformation and damage of the anode diffusion layer during long-term operation.

[0039] In a feasible embodiment provided by the present invention, the water channel sealing area 105 and the hydrogen sealing area 108 are both sealed with glue lines, which can form a continuous and reliable sealing structure, effectively preventing cooling water and hydrogen from leaking to other parts of the fuel cell to form a soft support structure, which can not only ensure the sealing performance, but also meet the support force and extrusion force during the stacking process, avoid the gas diffusion layer and the membrane electrode being damaged by the extrusion force, help to extend the service life of the fuel cell, and improve the reliability of the system. The sealing glue line can be reused, and the later maintenance cost is lower than that of the sealing gasket. Moreover, compared with the sealing gasket, the sealing glue line has a smaller stacking force and is easier to assemble.

[0040] Therefore, the water channel sealing area 105 and the hydrogen sealing area 108 adopt the setting of glue line sealing, which not only ensures the sealing, but also provides the necessary supporting force and extrusion force for the stacking process, while reducing the subsequent maintenance cost and simplifying the assembly process.

[0041] like Figure 3 As shown, in a feasible embodiment provided by the present invention, the water distribution area 102 is formed by cutting grooves or cover plate grooves to be flush with the water channel area 103 and appropriately sealed, and a hollow distribution channel is arranged in the middle. Among them, the cutting groove is a groove of a certain depth dug on the substrate, and the cover plate groove refers to a groove reserved on the cover plate. This design allows the water distribution area 102 to remain flush with the water channel area 103, thereby ensuring the smoothness of water during the circulation process. Maintaining a flush position can help reduce water flow resistance and avoid eddy currents or backflows at the channel conversion point, thereby improving electrolysis efficiency.

[0042] In addition, the water distribution area 102 and the water flow channel area 103 need to be properly sealed to prevent leakage of electrolyte. Proper sealing should ensure sealing performance while avoiding over-tight sealing that may cause assembly difficulties or damage components.

[0043] like Figure 4 As shown, the second embodiment of the present invention is to provide an electrolysis chamber, including a pair of bipolar plates 10, anode diffusion layer 13, membrane electrode 11 and cathode diffusion layer 12 as above, and the anode side and cathode side of the pair of bipolar plates 10 are arranged oppositely; the bipolar plate 10 plays the role of conducting, supporting and separating the anode and cathode in the electrolysis chamber, and usually has good conductivity and corrosion resistance. The anode diffusion layer 13, the membrane electrode 11 and the cathode diffusion layer 12 are arranged between the pair of bipolar plates 10, and the anode diffusion layer 13 is arranged close to the anode side, and the anode diffusion layer 13 helps the diffusion and discharge of gas, while ensuring that the current is evenly distributed to the anode surface. The membrane electrode 11 is located between the anode diffusion layer 13 and the cathode diffusion layer 12. The core component of the electrolysis chamber of the membrane electrode 11 includes an electrolyte membrane and a catalyst layer. The electrolyte membrane allows ions to pass through while preventing the direct transfer of gas and electrons, and the catalyst layer accelerates the electrochemical reaction. The cathode diffusion layer 12 is arranged close to the cathode side, and the cathode diffusion layer 12 helps the diffusion and discharge of gas, while ensuring that the current is evenly distributed to the cathode surface.

[0044] In the electrolysis chamber provided by the present invention, the anode diffusion layer 13, the membrane electrode 11, and the cathode diffusion layer 12 are sequentially arranged between a pair of bipolar plates 10 to form a complete electrolysis chamber structure. The current flows in from the bipolar plate on the anode side, passes through the anode diffusion layer 13 to the anode catalyst layer of the membrane electrode 11, then passes through the electrolyte to the cathode catalyst layer, and finally flows out through the cathode diffusion layer 12 and the bipolar plate on the cathode side.

[0045] like Figure 5 As shown, the third aspect of the embodiment of the present invention is to provide a hydrogen production electrolyzer, including a positive terminal plate 8, a positive insulating plate 7, a positive current collecting plate 6, an electrolyzer circulation chamber 5, a negative current collecting plate 4, a negative insulating plate 3, a negative terminal plate 2 and a water manifold 1, and the above multiple components need to be fastened and installed by fasteners 9.

[0046] Among them, the positive terminal plate 8 serves as the positive terminal of the electrolytic cell, providing current input and mechanical support. The positive insulating plate 7 is arranged on the top of the positive terminal plate 8 to prevent the current from flowing directly from the positive terminal plate 8 to other components. The positive current collecting plate 6 is arranged on the positive insulating plate 7 to collect the current from the positive terminal plate 8 and distribute it evenly to the anode side of each electrolytic cell of the electrolytic cell circulation cell. The electrolytic cell circulation cell 5 is composed of a plurality of electrolytic cells as described above connected in series, and each electrolytic cell includes a bipolar plate, an anode diffusion layer 13, a membrane electrode 11 and a cathode diffusion layer 12.

[0047] The electrolytic cell circulation chamber is arranged on the positive current collecting plate 6; the negative current collecting plate 4 is arranged on the electrolytic cell circulation chamber, and the negative current collecting plate 4 is used to collect the current from the electrolytic cell circulation chamber 5 and guide it to the negative terminal plate 2. The negative insulating plate 3 is arranged on the negative current collecting plate 4 to prevent the current from flowing from the negative insulating plate 3 to other non-conductive parts and provide mechanical support. The negative terminal plate 2 is arranged on the negative insulating plate 3 to provide current output and mechanical support. The waterway manifold 1 is arranged on the negative terminal plate 2 and is responsible for providing electrolyte solution to the electrolytic cell circulation chamber 5.

[0048] In a feasible embodiment provided by the present invention, a water inlet is provided on the side of the negative terminal plate 2, the water inlet is connected to the water manifold 1, and the water inlet performs preliminary water flow distribution.

[0049] like Figure 6 As shown, a plurality of water channel distribution ports 31 and water channel sealing grooves 32 are provided on both sides of the negative electrode insulating plate 3 along the length direction, and the water channel distribution ports 31 perform secondary water channel distribution to achieve uniform distribution of the water inlet of each plate. A plurality of second hydrogen outlets 33 and hydrogen sealing grooves 34 are provided on both sides of the negative electrode insulating plate 3 along the width direction. The water flow that undergoes the first water flow distribution at the negative electrode terminal plate 2 undergoes secondary water flow distribution through the water channel distribution ports 31 of the negative electrode insulating plate 3, so that the water flow at each water inlet fluctuates within 3%. The two water flow distributions of the negative electrode terminal plate 2 and the negative electrode insulating plate 3 make the water inlet flow distribution of the electrolyzer more uniform, thereby improving the consistency of the electrolyzer.

[0050] On the bipolar plate, the water flow distributed by the negative end plate 2 and the negative insulating plate 3 evenly passes through the water inlet and outlet 101, and then evenly enters the water channel area 103 through the water distribution area 102 to diffuse into the membrane electrode for electrolysis reaction, while evenly dissipating heat.

[0051] The hydrogen generated by electrolysis of water is converged through the first hydrogen outlet 104. The hydrogen distribution area 106 is consistent with the water distribution area 102. The hydrogen sealing area 108 is sealed by glue wire to ensure the hydrogen sealing. The hydrogen flow channel area 107 is a flat groove, which increases the contact area between the bipolar plate and the cathode diffusion layer, reduces the resistance, and prevents the cathode diffusion layer from being cut or squeezed under high stacking force.

[0052] Sealant lines are placed in the water channel sealing groove 32 and the hydrogen sealing groove 34 for sealing.

[0053] The positive electrode insulating plate 7 and the negative electrode insulating plate 3 are made of materials with excellent insulation and water resistance, such as PPS, POM, PSU and the like.

[0054] like Figure 7 As shown, in a feasible embodiment provided by the present invention, a cathode purge and drainage port 81 is provided on the positive terminal plate 8, which is used for purging and draining to keep the cathode dry after the electrolytic cell is shut down.

[0055] See again Figure 7 As shown, in a feasible embodiment provided by the present invention, an anode purge and drain port 82 is provided on the positive terminal plate 8, which is used for purging and draining to keep the anode dry after the electrolytic cell is shut down.

[0056] It should be noted that when the hydrogen production electrolyzer is used in the northwest and northeast, the outdoor temperature is low in winter, and the residual water in the hydrogen production electrolyzer will freeze, which may puncture the membrane electrode. The above settings solve the problem that the storage temperature of the electrolyzer needs to be higher than 0°C when it is shut down. At the same time, it prevents the high water content of the membrane electrode from freezing and piercing the membrane electrode at low temperatures, which can protect the membrane electrode and extend its service life.

[0057] Therefore, the hydrogen production electrolyzer provided by the present invention, the two water flow distributions of the negative terminal plate 2 and the negative insulating plate 3 make the water inlet flow distribution of the electrolyzer more uniform, and improve the consistency of the electrolyzer. The bipolar plate 10 is a bare plate for the cathode, which increases the contact area and improves the support of the cathode diffusion layer 12, protects the carbon paper, and allows it to be repeatedly disassembled and used without being cut or broken. The anode adopts a low-width flow channel to ensure the uniformity of water vapor transmission and the resistance of charge transmission. In addition, the positive terminal plate 8 at the bottom of the electrolyzer is provided with a cathode purge drain port 81 and an anode purge drain port 82, which are used for purging after the electrolyzer is shut down to prevent the high water content of the membrane electrode 11 from causing ice to pierce the membrane electrode 11 at low temperatures, protect the membrane electrode 11, and extend the service life.

[0058] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bipolar plate (10), characterized in that: It comprises a body, wherein the body is provided with a plurality of water inlets and outlets (101) on both sides along the length direction, and a plurality of first hydrogen outlets (104) on both sides along the width direction, and the body is provided with an anode side and a cathode side on both sides in the thickness direction; On the side surface of the anode, water channel distribution areas (102) are arranged on both sides along the width direction, a water channel flow area (103) is arranged between the water channel distribution areas (102) on both sides and is connected to the water channel distribution areas (102), and a water channel sealing area (105) is arranged around the water channel distribution area (102); the water channel flow area (103) comprises a plurality of water channel flow areas; On the cathode side, hydrogen distribution areas (106) are arranged on both sides along the width direction, and a hydrogen flow channel area (107) is opened between the hydrogen distribution areas (106) on both sides, the hydrogen flow channel area (107) is a light plate groove, and a hydrogen sealing area (108) is arranged on the surrounding side of the hydrogen distribution area (106).

2. The bipolar plate according to claim 1, characterized in that: The opening rate of the water channel area (103) is a, 40%≤a≤60%, and the width of the water channel is b, b≤1 mm.

3. The bipolar plate according to claim 1, characterized in that: The water channel sealing area (105) and the hydrogen sealing area (108) are both sealed with glue lines to form a soft supporting structure.

4. The bipolar plate according to claim 1, characterized in that: The water channel distribution area (105) is formed by cutting a groove or a cover plate groove to be flush with the water channel flow channel area (103).

5. An electrolysis chamber, characterized in that: include: A pair of bipolar plates (10) according to any one of claims 1 to 4, wherein the anode side and the cathode side of the pair of bipolar plates (10) are arranged opposite to each other; An anode diffusion layer (13), a membrane electrode (11) and a cathode diffusion layer (12) are arranged between a pair of bipolar plates (10), and the anode diffusion layer (13) is arranged close to the anode side, and the cathode diffusion layer (12) is arranged close to the cathode side.

6. A hydrogen production electrolyzer, characterized in that: include: Positive terminal plate (8); A positive electrode insulating plate (7), arranged on top of the positive electrode terminal plate (8); A positive electrode current collecting plate (6) is arranged on the positive electrode insulating plate (7); An electrolytic cell circulation chamber (5) is formed by connecting a plurality of electrolytic cells as claimed in claim 5 in series; the electrolytic cell circulation chamber is arranged on the positive electrode current collecting plate (6); A negative electrode current collecting plate (4) is arranged on the circulation chamber of the electrolytic cell; A negative electrode insulating plate (3) is arranged on the negative electrode current collecting plate (4); A negative terminal plate (2) is arranged on the negative insulating plate (3); The water channel manifold (1) is arranged on the negative terminal plate (2).

7. The hydrogen production electrolyzer according to claim 6, characterized in that: A water inlet is provided on the side of the negative terminal plate (2), and the water inlet is communicated with the water channel manifold (1); a plurality of water channel distribution ports (31) and water channel sealing grooves (32) are provided on both sides along the length direction of the negative insulating plate (3), and the water channel distribution ports (31) perform secondary water channel distribution; and a plurality of second hydrogen outlets (33) and hydrogen sealing grooves (34) are provided on both sides along the width direction of the negative insulating plate (3).

8. The hydrogen production electrolyzer according to claim 7, characterized in that: Sealing glue lines are placed in the hydrogen sealing groove (24) and the water channel sealing groove (22) for sealing.

9. The hydrogen production electrolyzer according to claim 6, characterized in that: The positive terminal plate (8) is provided with a cathode purge drain port (81).

10. The hydrogen production electrolyzer according to claim 6, characterized in that: The positive terminal plate (8) is provided with an anode purge drain port (82).

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