Bipolar plate, electrolysis unit, electrolytic bath, hydrogen production device and new energy hydrogen production system
Through the reverse flow electrolyte path design, the problem of temperature inhomogeneity of the electrolytic cell is solved, and the electrolytic efficiency is improved and the electrolytic cell life is extended.
Patent Information
- Application Number
- CN202422255946.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-13
AI Technical Summary
The problem of reduced electrolytic efficiency and shortened electrolytic life caused by uneven temperature of electrolytic solution in traditional electrolytic cells.
The bipolar plate is designed to make the electrolyte path flow in reverse, and heat exchange between the low-temperature electrolyte and the high-temperature electrolyte is achieved by approaching the set electrolyte inlet and outlet, reducing the risk of local overheating or supercooling, and improving temperature uniformity.
It improves the temperature uniformity and stability in the electrolytic cell, improves the electrolytic efficiency, and extends the service life of the electrolytic cell.
Smart Images
Figure CN223163499U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of electrolytic hydrogen production, and particularly relates to a bipolar plate, an electrolytic cell, an electrolyzer, a hydrogen production device, and a new energy hydrogen production system. Background Art
[0002] In the technical field of electrolytic hydrogen production, as a key device, the internal temperature control of the electrolyzer directly affects the stability and efficiency of the electrolysis process. In the traditional design of the electrolyzer, a large amount of heat is generated during the electrolysis process of the electrolyte. Especially at the outlet end of the electrolyzer, due to the continuous progress of the electrolysis reaction and the accumulation of the electrolyte, the problem of excessive electrolyte temperature often occurs. This high-temperature state not only damages the material and structure of the electrolyzer, shortening the service life of the electrolyzer, but also may cause uneven temperature distribution inside the electrolyzer, forming an obvious temperature gradient, thereby affecting the kinetic conditions of the electrolysis reaction and reducing the electrolysis efficiency. Summary of the Utility Model
[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides a bipolar plate, an electrolytic cell, an electrolyzer, a hydrogen production device, and a new energy hydrogen production system, which can reduce the risk of local overheating or overcooling, improve the temperature uniformity inside the bipolar plate, help reduce the temperature gradient inside the electrolyzer, maintain the stability and high efficiency of the electrolysis process, improve the electrolysis efficiency, and extend the service life of the electrolyzer.
[0004] In a first aspect, this application provides a bipolar plate applied to an electrolyzer. First electrolytic chambers and second electrolytic chambers are formed on both sides of the bipolar plate. The bipolar plate has a first-side electrolyte inlet, a first-side electrolyte outlet, a second-side electrolyte inlet, and a second-side electrolyte outlet. The first-side electrolyte inlet and the first-side electrolyte outlet are both communicated with the first electrolytic chamber, and the second-side electrolyte inlet and the second-side electrolyte outlet are both communicated with the second electrolytic chamber. The distance between the first-side electrolyte inlet and the second-side electrolyte outlet is less than the distance between the first-side electrolyte inlet and the second-side electrolyte inlet, and the distance between the second-side electrolyte inlet and the first-side electrolyte outlet is less than the distance between the first-side electrolyte inlet and the second-side electrolyte inlet.
[0005] According to the bipolar plate of the present application, through the layout design in which the first-side electrolyte inlet and the second-side electrolyte outlet are arranged close to each other and the second-side electrolyte inlet and the first-side electrolyte outlet are arranged close to each other, the paths of the first-side electrolyte and the second-side electrolyte are set to flow reversely. The low-temperature electrolyte at the first-side electrolyte inlet exchanges heat with the high-temperature electrolyte at the second-side electrolyte outlet, and the low-temperature electrolyte at the second-side electrolyte inlet exchanges heat with the high-temperature electrolyte at the first-side electrolyte outlet. This reduces the risk of local overheating or overcooling, thereby improving the temperature uniformity within the bipolar plate, helping to reduce the temperature gradient within the electrolytic cell, maintaining the stability and efficiency of the electrolysis process, and thus significantly enhancing the electrolysis efficiency while extending the service life of the electrolytic cell.
[0006] According to an embodiment of the present application, the included angle between the first connection line and the second connection line is an obtuse angle, and the included angle between the third connection line and the fourth connection line is an obtuse angle. Among them, the first connection line is the connection line between the center of the first-side electrolyte inlet and the center of the bipolar plate, the second connection line is the connection line between the center of the second-side electrolyte inlet and the center of the bipolar plate, the third connection line is the connection line between the center of the first-side electrolyte outlet and the center of the bipolar plate, and the fourth connection line is the connection line between the center of the second-side electrolyte outlet and the center of the bipolar plate.
[0007] According to an embodiment of the present application, the included angle between the first connection line and the fourth connection line is an acute angle, and the included angle between the second connection line and the third connection line is an acute angle.
[0008] According to an embodiment of the present application, the center of the bipolar plate is located on the fifth connection line. Among them, the fifth connection line is the connection line between the center of the first-side electrolyte inlet and the center of the first-side electrolyte outlet.
[0009] According to an embodiment of the present application, the center of the bipolar plate is located on the sixth connection line. Among them, the sixth connection line is the connection line between the center of the second-side electrolyte inlet and the center of the second-side electrolyte outlet.
[0010] According to an embodiment of the present application, the bipolar plate includes:
[0011] A main board body,
[0012] A pole frame that surrounds the main board body and forms the first electrolytic small chamber and the second electrolytic small chamber with the main board body. The pole frame has the first-side electrolyte inlet, the first-side electrolyte outlet, the second-side electrolyte inlet, and the second-side electrolyte outlet.
[0013] In a second aspect, the present application provides an electrolysis unit, including:
[0014] Stacked bipolar plates, a first electrode, a diaphragm, a second electrode, and a bipolar plate; wherein, the bipolar plate is any one of the bipolar plates as described above.
[0015] According to the electrolysis unit of the present application, through the setting of the above bipolar plate, the paths of the first-side electrolyte and the second-side electrolyte are set to flow reversely. The low-temperature electrolyte at the inlet of the first-side electrolyte exchanges heat with the high-temperature electrolyte at the outlet of the second-side electrolyte, and the low-temperature electrolyte at the inlet of the second-side electrolyte exchanges heat with the high-temperature electrolyte at the outlet of the first-side electrolyte, reducing the risk of local overheating or overcooling. Thereby, the temperature uniformity inside the electrode plate is improved, which helps to reduce the temperature gradient inside the electrolyzer, maintain the stability and efficiency of the electrolysis process, and then significantly improve the electrolysis efficiency, while extending the service life of the electrolyzer.
[0016] In a third aspect, the present application provides an electrolyzer, which includes:
[0017] The electrolysis unit as described above.
[0018] According to the electrolyzer of the present application, through the setting of the above electrolysis unit, the paths of the first-side electrolyte and the second-side electrolyte are set to flow reversely. The low-temperature electrolyte at the inlet of the first-side electrolyte exchanges heat with the high-temperature electrolyte at the outlet of the second-side electrolyte, and the low-temperature electrolyte at the inlet of the second-side electrolyte exchanges heat with the high-temperature electrolyte at the outlet of the first-side electrolyte, reducing the risk of local overheating or overcooling. Thereby, the temperature uniformity inside the bipolar plate is improved, which helps to reduce the temperature gradient inside the electrolyzer, maintain the stability and efficiency of the electrolysis process, and then significantly improve the electrolysis efficiency, while extending the service life of the electrolyzer.
[0019] In a fourth aspect, the present application provides a hydrogen production device, which includes:
[0020] The electrolyzer as described above.
[0021] According to the hydrogen production device of the present application, through the setting of the above electrolyzer, the paths of the first-side electrolyte and the second-side electrolyte are set to flow reversely. The low-temperature electrolyte at the inlet of the first-side electrolyte exchanges heat with the high-temperature electrolyte at the outlet of the second-side electrolyte, and the low-temperature electrolyte at the inlet of the second-side electrolyte exchanges heat with the high-temperature electrolyte at the outlet of the first-side electrolyte, reducing the risk of local overheating or overcooling. Thereby, the temperature uniformity inside the bipolar plate is improved, which helps to reduce the temperature gradient inside the electrolyzer, maintain the stability and efficiency of the electrolysis process, and then significantly improve the electrolysis efficiency, while extending the service life of the electrolyzer.
[0022] In a fifth aspect, the present application provides a new energy hydrogen production system, which includes:
[0023] The hydrogen production device as described above;
[0024] A new energy power source, which is electrically connected to the hydrogen production device.
[0025] In the new energy hydrogen production system according to the present application, through the setting of the above hydrogen production equipment, the paths of the first-side electrolyte and the second-side electrolyte are set to flow reversely. The low-temperature electrolyte at the first-side electrolyte inlet exchanges heat with the high-temperature electrolyte at the second-side electrolyte outlet, and the low-temperature electrolyte at the second-side electrolyte inlet exchanges heat with the high-temperature electrolyte at the first-side electrolyte outlet, reducing the risk of local overheating or overcooling. Thereby, the temperature uniformity inside the bipolar plate is improved, which helps to reduce the temperature gradient in the electrolytic cell, maintain the stability and efficiency of the electrolysis process, and thus significantly improve the electrolysis efficiency while extending the service life of the electrolytic cell.
[0026] Additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. Description of the Drawings
[0027] The above and / or additional aspects and advantages of the present application will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, where:
[0028] Figure 1 is one of the schematic structural diagrams of the bipolar plate provided by the embodiment of the present application;
[0029] Figure 2 is the second schematic structural diagram of the bipolar plate provided by the embodiment of the present application.
[0030] Reference Signs:
[0031] Bipolar plate 100, main board body 110;
[0032] Pole frame 120, first-side electrolyte inlet 121, first-side electrolyte outlet 122, second-side electrolyte inlet 123, second-side electrolyte outlet 124;
[0033] First electrolysis chamber 130, second electrolysis chamber 140. Detailed Description of the Embodiments
[0034] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.
[0035] The present application discloses a bipolar plate 100, which is applied to an electrolytic cell.
[0036] Reference is made below to Figure 1 - Figure 2 describe the bipolar plate 100 according to an embodiment of the present application.
[0037] In some embodiments, as Figure 1 - Figure 2 shown, the first electrolytic chamber 130 and the second electrolytic chamber 140 are formed on both sides of the bipolar plate 100, and the bipolar plate 100 has a first-side electrolyte inlet 121, a first-side electrolyte outlet 122, a second-side electrolyte inlet 123, and a second-side electrolyte outlet 124. The first-side electrolyte inlet 121 and the first-side electrolyte outlet 122 are both in communication with the first electrolytic chamber 130, the second-side electrolyte inlet 123 and the second-side electrolyte outlet 124 are both in communication with the second electrolytic chamber 140. The distance between the first-side electrolyte inlet 121 and the second-side electrolyte outlet 124 is less than the distance between the first-side electrolyte inlet 121 and the second-side electrolyte inlet 123, and the distance between the second-side electrolyte inlet 123 and the first-side electrolyte outlet 122 is less than the distance between the first-side electrolyte inlet 121 and the second-side electrolyte inlet 123.
[0038] Exemplarily, the first electrolytic chamber 130 has a structure open on one side, and the first-side electrolyte inlet 121, the first-side electrolyte outlet 122, the second-side electrolyte inlet 123, and the second-side electrolyte outlet 124 are in the shape of channels open at both ends.
[0039] In this embodiment, as Figure 1 - Figure 2 shown, the front and back sides of the bipolar plate 100 have opposite polarities, and one of the first electrolytic chamber 130 and the second electrolytic chamber 140 is a cathode chamber and the other is an anode chamber. When the first electrolytic chamber 130 is the anode chamber and the second electrolytic chamber 140 is the cathode chamber, the first-side electrolyte inlet 121 and the first-side electrolyte outlet 122 are the oxygen-side electrolyte inlet and the oxygen-side electrolyte outlet, and the second-side electrolyte inlet 123 and the second-side electrolyte outlet 124 are the hydrogen-side electrolyte inlet and the hydrogen-side electrolyte outlet; when the first electrolytic chamber 130 is the cathode chamber and the second electrolytic chamber 140 is the anode chamber, the first-side electrolyte inlet 121 and the first-side electrolyte outlet 122 are the hydrogen-side electrolyte inlet and the hydrogen-side electrolyte outlet, and the second-side electrolyte inlet 123 and the second-side electrolyte outlet 124 are the oxygen-side electrolyte inlet and the oxygen-side electrolyte outlet.
[0040] In the related art, the hydrogen side and the oxygen side of the electrolytic chambers of some electrolyzers have the same electrolyte inlet and outlet modes, which generally show that the electrolyte enters from one side and exits from the other side. That is, the first-side electrolyte inlet and the second-side electrolyte inlet are arranged on the same side of the electrolyzer, and the first-side electrolyte outlet and the second-side electrolyte outlet are arranged on the same side of the electrolyzer. During the operation of the electrolyzer, a large amount of waste heat is carried out by the electrolyte. The temperature in the electrolytic chamber gradually increases along the direction of electrolyte flow. Since the above-mentioned hydrogen-side electrolyte and oxygen-side electrolyte flow in the same direction, the inlet temperature of the electrolyte of this type of electrolyzer is generally around 60 °C, and the outlet temperature is generally around 90 °C. In this way, the temperature field distribution inside the electrolyzer is extremely uneven, which is not conducive to the improvement of the electrolysis efficiency.
[0041] It can be understood that since the distance between the first-side electrolyte inlet 121 and the second-side electrolyte outlet 124 is less than the distance between the first-side electrolyte inlet 121 and the second-side electrolyte inlet 123. In other words, the second-side electrolyte outlet 124 is close to the first-side electrolyte inlet 121, while the second-side electrolyte inlet 123 is far from the first-side electrolyte inlet 121. Also, since the distance between the second-side electrolyte inlet 123 and the first-side electrolyte outlet 122 is less than the distance between the first-side electrolyte inlet 121 and the second-side electrolyte inlet 123. In other words, the first-side electrolyte outlet 122 is close to the second-side electrolyte inlet 123, while the second-side electrolyte inlet 123 is far from the first-side electrolyte inlet 121. Generally speaking, the first-side electrolyte inlet 121 and the second-side electrolyte outlet 124 are close to each other, and the second-side electrolyte inlet 123 and the first-side electrolyte outlet 122 are close to each other. In this way, during the operation of the electrolyzer, the low-temperature electrolyte at the first-side electrolyte inlet 121 can exchange heat with the high-temperature electrolyte at the second-side electrolyte outlet 124, and the low-temperature electrolyte at the second-side electrolyte inlet 123 can exchange heat with the high-temperature electrolyte at the first-side electrolyte outlet 122, making the temperature in the area where the first-side electrolyte inlet 121 and the second-side electrolyte outlet 124 are located relatively equivalent to the temperature in the area where the second-side electrolyte inlet 123 and the first-side electrolyte outlet 122 are located. Thus, it is beneficial to the uniform distribution of the temperature field in the electrolytic chamber formed between two adjacent bipolar plates 100.
[0042] The bipolar plate 100 provided by the embodiment of the present application, through the layout design in which the first-side electrolyte inlet 121 and the second-side electrolyte outlet 124 are arranged close to each other and the second-side electrolyte inlet 123 and the first-side electrolyte outlet 122 are arranged close to each other, realizes that the paths of the first-side electrolyte and the second-side electrolyte are set to flow in reverse. The low-temperature electrolyte at the first-side electrolyte inlet 121 exchanges heat with the high-temperature electrolyte at the second-side electrolyte outlet 124, and the low-temperature electrolyte at the second-side electrolyte inlet 123 exchanges heat with the high-temperature electrolyte at the first-side electrolyte outlet 122, reducing the risk of local overheating or overcooling. Thereby, the temperature uniformity inside the bipolar plate 100 is improved, which helps to reduce the temperature gradient in the electrolytic cell, maintain the stability and efficiency of the electrolysis process, and then significantly improve the electrolysis efficiency, while extending the service life of the electrolytic cell.
[0043] In some embodiments, as Figure 1 - Figure 2 shown, the included angle α1 between the first connecting line OA and the second connecting line OC is an obtuse angle, and the included angle α2 between the third connecting line OB and the fourth connecting line OD is an obtuse angle, where the first connecting line OA is the connecting line between the center A of the first-side electrolyte inlet 121 and the center O of the bipolar plate 100, the second connecting line OC is the connecting line between the center C of the second-side electrolyte inlet 123 and the center O of the bipolar plate 100, the third connecting line OB is the connecting line between the center B of the first-side electrolyte outlet 122 and the center O of the bipolar plate 100, and the fourth connecting line OD is the connecting line between the center D of the second-side electrolyte outlet 124 and the center O of the bipolar plate 100.
[0044] In this embodiment, the included angle α1 between the first connecting line OA and the second connecting line OC can be 150°, and the included angle α2 between the third connecting line OB and the fourth connecting line OD can also be 150°.
[0045] In some other embodiments, the included angle α1 between the first connecting line OA and the second connecting line OC can be 125°, and the included angle α2 between the third connecting line OB and the fourth connecting line OD can also be 155°.
[0046] In still some other embodiments, the included angle α1 between the first connecting line OA and the second connecting line OC can be 108.4°, and the included angle α2 between the third connecting line OB and the fourth connecting line OD can also be 142.6°.
[0047] It can be understood that in the case where α1 and α2 are obtuse angles, the distance between the first-side electrolyte inlet 121 and the second-side electrolyte inlet 123 is increased as much as possible, and the distance between the first-side electrolyte outlet 122 and the second-side electrolyte outlet 124 is increased as much as possible, so as to further promote the uniform distribution of heat and further reduce the risk of a decrease in electrolysis efficiency or electrode damage caused by local overheating.
[0048] In some embodiments, as Figure 1 - Figure 2 shown, the included angle β1 between the first connection line OA and the fourth connection line OD is an acute angle, and the included angle β2 between the second connection line OC and the third connection line OB is an acute angle.
[0049] In this embodiment, the included angle β1 between the first connection line OA and the fourth connection line OD can be 30°, and the included angle β2 between the second connection line OC and the third connection line OB can also be 30°.
[0050] In other embodiments, the included angle β1 between the first connection line OA and the fourth connection line OD can be 45°, and the included angle β2 between the second connection line OC and the third connection line OB can also be 35°.
[0051] In still other embodiments, the included angle β1 between the first connection line OA and the fourth connection line OD can be 37.2°, and the included angle β2 between the second connection line OC and the third connection line OB can also be 54.6°.
[0052] It can be understood that when β1 and β2 are acute angles, the distance between the first-side electrolyte inlet 121 and the second-side electrolyte outlet 124 is minimized as much as possible, and the distance between the first-side electrolyte outlet 122 and the second-side electrolyte inlet 123 is minimized as much as possible, so as to further promote the heat exchange between the low-temperature electrolyte at the first-side electrolyte inlet 121 and the high-temperature electrolyte at the second-side electrolyte outlet 124, and further promote the heat exchange between the low-temperature electrolyte at the second-side electrolyte inlet 123 and the high-temperature electrolyte at the first-side electrolyte outlet 122, so that heat can be conducted from the high-temperature region to the low-temperature region faster, thereby maintaining the stability and uniformity of the temperature inside the entire electrolytic cell.
[0053] In some embodiments, as Figure 1 - Figure 2 shown, the center O of the bipolar plate 100 is located on the fifth connection line AB, where the fifth connection line AB is the connection line between the center A of the first-side electrolyte inlet 121 and the center B of the first-side electrolyte outlet 122.
[0054] In this embodiment, the center O of the bipolar plate 100, the center A of the first-side electrolyte inlet 121, and the center B of the first-side electrolyte outlet 122 are located on the same straight line. In other words, the first-side electrolyte inlet 121 and the first-side electrolyte outlet 122 are diagonally arranged on the bipolar plate 100.
[0055] The bipolar plate 100 provided by the embodiment of the present application, through the layout design in which the first-side electrolyte inlet 121 and the first-side electrolyte outlet 122 are diagonally arranged, can guide the first-side electrolyte to pass through the bipolar plate 100 along a longer path, thereby improving the electrolysis efficiency. At the same time, the extended flow path helps the first-side electrolyte to be more evenly distributed and more effectively exchange heat within the bipolar plate 100, reducing the risk of local overheating or insufficient reaction. And the gas generated during the electrolysis process may form bubbles on the path of the first-side electrolyte flow. The diagonal arrangement helps to disperse the bubbles and reduce the impact of the bubbles on the electrolysis efficiency.
[0056] In some embodiments, as Figure 1 - Figure 2 shown, the center O of the bipolar plate 100 is located on the sixth connecting line CD, where the sixth connecting line CD is the connecting line between the center C of the second-side electrolyte inlet 123 and the center D of the second-side electrolyte outlet 124.
[0057] In this embodiment, the center O of the bipolar plate 100, the center C of the second-side electrolyte inlet 123, and the center D of the second-side electrolyte outlet 124 are located on the same straight line. In other words, the second-side electrolyte inlet 123 and the second-side electrolyte outlet 124 are diagonally arranged on the bipolar plate 100.
[0058] The bipolar plate 100 provided by the embodiment of the present application, through the layout design in which the second-side electrolyte inlet 123 and the second-side electrolyte outlet 124 are diagonally arranged, can guide the second-side electrolyte to pass through the bipolar plate 100 along a longer path, thereby improving the electrolysis efficiency. At the same time, the extended flow path helps the second-side electrolyte to be more evenly distributed and more effectively exchange heat within the bipolar plate 100, reducing the risk of local overheating or insufficient reaction. And the gas generated during the electrolysis process may form bubbles on the path of the second-side electrolyte flow. The diagonal arrangement helps to disperse the bubbles and reduce the impact of the bubbles on the electrolysis efficiency.
[0059] In some embodiments, as Figure 1 - Figure 2 shown, the bipolar plate 100 includes: a main board body 110 and a pole frame 120.
[0060] The pole frame 120 surrounds the main board body 110. The pole frame 120 and the main board body 110 form a first electrolysis chamber 130 and a second electrolysis chamber 140. The pole frame 120 has a first-side electrolyte inlet 121, a first-side electrolyte outlet 122, a second-side electrolyte inlet 123, and a second-side electrolyte outlet 124.
[0061] The main board body 110 is usually rectangular, circular or in a shape customized according to specific application requirements. The pole frame 120 is usually designed in a frame shape surrounding the main board body 110. The shape of the pole frame 120 matches the shape of the main board body 110 so that the two can be closely attached to form the first electrolytic cell 130. The shape of the pole frame 120 can be a rectangular frame, an annular frame or other shapes that can surround the main board body 110.
[0062] For example, in some embodiments, as Figure 1 - Figure 2 shown, the main board body 110 is in the shape of a circular plate, and the pole frame 120 is in the shape of a circular ring.
[0063] The main board body 110 and the pole frame 120 can be made of metal materials that are resistant to alkaline corrosion and have good electrical conductivity, such as nickel, steel, etc. The present application does not limit this.
[0064] On the pole frame 120, a first-side electrolyte inlet 121, a first-side electrolyte outlet 122, a second-side electrolyte inlet 123 and a second-side electrolyte outlet 124 can be processed by drilling, laser cutting or stamping, etc.
[0065] In the bipolar plate 100 provided by the embodiment of the present application, through the above settings of the main board body 110 and the pole frame 120, and the design that the pole frame 120 surrounds the main board body 110, the electrolyte can be more effectively distributed on the surface of the main board body 110 during the electrolysis process, increasing the contact area of the electrolysis reaction, helping to reduce the concentration gradient of the electrolyte, making the electrolysis reaction more uniform and rapid, thereby improving the electrolysis efficiency. At the same time, the surrounding design of the pole frame 120 helps to disperse the mechanical stress and thermal stress borne by the main board body 110 during the electrolysis process, reducing the risk of deformation and damage of the main board body 110. And using this kind of bipolar plate 100 design has a certain generality and can adapt to different types of electrolysis processes and electrolyte systems. By adjusting parameters such as the shape, size and material of the main board body 110 and the pole frame 120, different electrolysis requirements can be flexibly met.
[0066] The present application also discloses an electrolysis unit.
[0067] In some embodiments, the electrolysis unit includes: bipolar plates 100, a first electrode, a diaphragm, a second electrode and bipolar plates 100 that are stacked; wherein, the bipolar plate 100 is the bipolar plate 100 of any one of the above.
[0068] The electrolysis unit provided by the embodiment of the present application realizes the reverse flow of the first-side electrolyte and the second-side electrolyte through the above-mentioned bipolar plate 100. The low-temperature electrolyte at the first-side electrolyte inlet 121 exchanges heat with the high-temperature electrolyte at the second-side electrolyte outlet 124, and the low-temperature electrolyte at the second-side electrolyte inlet 123 exchanges heat with the high-temperature electrolyte at the first-side electrolyte outlet 122, reducing the risk of local overheating or overcooling. Thus, the temperature uniformity inside the bipolar plate 100 is improved, which helps to reduce the temperature gradient in the electrolyzer, maintain the stability and efficiency of the electrolysis process, and then significantly improve the electrolysis efficiency while extending the service life of the electrolyzer.
[0069] The present application also discloses an electrolyzer.
[0070] In some embodiments, the electrolyzer includes the above-mentioned electrolysis unit.
[0071] In the electrolyzer, the first-side electrolyte inlets 121 of multiple bipolar plates 100 are arranged oppositely along the stacking direction and are sequentially connected; the first-side electrolyte outlets 122 of multiple bipolar plates 100 are arranged oppositely along the stacking direction and are sequentially connected; the second-side electrolyte inlets 123 of multiple bipolar plates 100 are arranged oppositely along the stacking direction and are sequentially connected; the second-side electrolyte outlets 124 of multiple bipolar plates 100 are arranged oppositely along the stacking direction and are sequentially connected.
[0072] The electrolyzer provided by the embodiment of the present application realizes the reverse flow of the first-side electrolyte and the second-side electrolyte through the above-mentioned electrolysis unit. The low-temperature electrolyte at the first-side electrolyte inlet 121 exchanges heat with the high-temperature electrolyte at the second-side electrolyte outlet 124, and the low-temperature electrolyte at the second-side electrolyte inlet 123 exchanges heat with the high-temperature electrolyte at the first-side electrolyte outlet 122, reducing the risk of local overheating or overcooling. Thus, the temperature uniformity inside the bipolar plate 100 is improved, which helps to reduce the temperature gradient in the electrolyzer, maintain the stability and efficiency of the electrolysis process, and then significantly improve the electrolysis efficiency while extending the service life of the electrolyzer.
[0073] The present application also discloses a hydrogen production device.
[0074] In some embodiments, the hydrogen production device includes the above-mentioned electrolyzer.
[0075] The hydrogen production device provided by the embodiment of the present application realizes the reverse flow of the first-side electrolyte and the second-side electrolyte through the above arrangement of the electrolytic cell. The low-temperature electrolyte at the first-side electrolyte inlet 121 exchanges heat with the high-temperature electrolyte at the second-side electrolyte outlet 124, and the low-temperature electrolyte at the second-side electrolyte inlet 123 exchanges heat with the high-temperature electrolyte at the first-side electrolyte outlet 122, reducing the risk of local overheating or overcooling. Thereby, the temperature uniformity inside the bipolar plate 100 is improved, which helps to reduce the temperature gradient in the electrolytic cell, maintain the stability and efficiency of the electrolysis process, and then significantly improve the electrolysis efficiency while extending the service life of the electrolytic cell.
[0076] The present application also discloses a new energy hydrogen production system.
[0077] In some embodiments, the new energy hydrogen production system includes: a new energy power source and the hydrogen production device as described above.
[0078] The new energy power source is electrically connected to the hydrogen production device.
[0079] The new energy power source may include, but is not limited to, a photovoltaic power station, a hydropower station, a wind power station, a tidal power station, etc., and there is no limitation here.
[0080] The new energy hydrogen production system provided by the embodiment of the present application realizes the reverse flow of the first-side electrolyte and the second-side electrolyte through the above arrangement of the hydrogen production device. The low-temperature electrolyte at the first-side electrolyte inlet 121 exchanges heat with the high-temperature electrolyte at the second-side electrolyte outlet 124, and the low-temperature electrolyte at the second-side electrolyte inlet 123 exchanges heat with the high-temperature electrolyte at the first-side electrolyte outlet 122, reducing the risk of local overheating or overcooling. Thereby, the temperature uniformity inside the bipolar plate 100 is improved, which helps to reduce the temperature gradient in the electrolytic cell, maintain the stability and efficiency of the electrolysis process, and then significantly improve the electrolysis efficiency while extending the service life of the electrolytic cell.
[0081] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.
[0082] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.
[0083] In the description of the present application, the "first feature" and "second feature" may include one or more of such features.
[0084] In the description of the present application, the meaning of "a plurality of" is two or more.
[0085] In the description of the present application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.
[0086] In the description of the present application, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.
[0087] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.
[0088] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.
Claims
1. A bipolar plate, applied to an electrolytic cell, characterized in that, On both sides of the bipolar plate, a first electrolytic cell and a second electrolytic cell are formed. The bipolar plate has a first-side electrolyte inlet, a first-side electrolyte outlet, a second-side electrolyte inlet, and a second-side electrolyte outlet. The first-side electrolyte inlet and the first-side electrolyte outlet are both communicated with the first electrolytic cell, and the second-side electrolyte inlet and the second-side electrolyte outlet are both communicated with the second electrolytic cell. The distance between the first-side electrolyte inlet and the second-side electrolyte outlet is less than the distance between the first-side electrolyte inlet and the second-side electrolyte inlet, and the distance between the second-side electrolyte inlet and the first-side electrolyte outlet is less than the distance between the first-side electrolyte inlet and the second-side electrolyte inlet.
2. The bipolar plate according to claim 1, characterized in that, The included angle between the first connection line and the second connection line is an obtuse angle, and the included angle between the third connection line and the fourth connection line is an obtuse angle. Among them, the first connection line is the connection line between the center of the first-side electrolyte inlet and the center of the bipolar plate, the second connection line is the connection line between the center of the second-side electrolyte inlet and the center of the bipolar plate, the third connection line is the connection line between the center of the first-side electrolyte outlet and the center of the bipolar plate, and the fourth connection line is the connection line between the center of the second-side electrolyte outlet and the center of the bipolar plate.
3. The bipolar plate according to claim 2, wherein The included angle between the first connection line and the fourth connection line is an acute angle, and the included angle between the second connection line and the third connection line is an acute angle.
4. The bipolar plate according to claim 2, wherein the center of the bipolar plate is located on the fifth connection line, where the fifth connection line is the connection line between the center of the first-side electrolyte inlet and the center of the first-side electrolyte outlet; and / or the center of the bipolar plate is located on the sixth connection line, where the sixth connection line is the connection line between the center of the second-side electrolyte inlet and the center of the second-side electrolyte outlet.
5. The bipolar plate according to any one of claims 1-4, characterized in that, Comprising: a main board body a pole frame that surrounds the main board body and forms the first electrolytic cell and the second electrolytic cell with the main board body. The pole frame has the first-side electrolyte inlet, the first-side electrolyte outlet, the second-side electrolyte inlet, and the second-side electrolyte outlet.
6. An electrolysis unit, characterized in that, Comprising: bipolar plates, a first electrode, a diaphragm, a second electrode, and bipolar plates stacked on top of each other; wherein the bipolar plate is the bipolar plate according to any one of claims 1-5.
7. An electrolytic cell, characterized in that, Comprising: the electrolysis unit according to claim 6.
8. A hydrogen production device, characterized in that, Comprising: the electrolytic cell according to claim 7.
9. A new energy hydrogen production system, characterized in that, Comprising: the hydrogen production device according to claim 8; a new energy power source, and the new energy power source is electrically connected to the hydrogen production device.