Bipolar plate and electrolytic bath

Abstract

The utility model provides a bipolar plate and an electrolytic bath. The bipolar plate comprises an electrode plate and an electrode frame, the electrode frame is provided with a channel hole, and the section profile of the inner wall of the channel hole in the axial direction has more than two curvatures. When the electrolyte enters the channel hole, the electrolyte does not directly flow from the inlet end to the outlet end along the axial direction in a round or waist-shaped through hole and the like in the channel hole, but changes based on the bending degree of the inner wall of the channel hole; the electrolyte can form a rotational flow shape in the circumferential direction of the channel hole in the tangential direction of different positions of the inner wall, so that the electrolyte has a certain turbulence effect in the circumferential direction while moving in the axial direction of the channel hole. Therefore, based on the movement form of the electrolyte, the electrolyte can be more uniformly distributed into each small electrolysis chamber, so that the temperature difference among the small electrolysis chambers is reduced, and the temperature uniformity in each small electrolysis chamber is improved.

Description

Technical Field

[0001] This application belongs to the field of water electrolysis for hydrogen production technology, and in particular relates to a bipolar plate and an electrolyzer. Background Technology

[0002] Currently, industrial alkaline water electrolysis for hydrogen production mostly uses bipolar pressure filter electrolyzers. These electrolyzers consist of several stacked bipolar plates, each of which typically has regular channel holes (such as circular or oblong holes) for axial liquid inlet.

[0003] For gas production greater than 600 Nm 3 For large electrolytic cells with a capacity of / h, due to the long length of the electrolytic cell equipment, when the electrolyte enters from one end (i.e., end A) and flows axially into the other end (i.e., end B) of the electrolytic cell along the channel holes on the bipolar plate, the electrolyte will flow straight out axially within each channel hole. This is not conducive to the distribution of electrolyte to the small chambers in the radial direction. As a result, liquid will accumulate in the channel holes in a certain area near end B along the length of the electrolytic cell equipment, leading to uneven distribution of electrolyte between end A and end B of the electrolytic cell. Utility Model Content

[0004] This application provides a bipolar plate and an electrolytic cell to solve the technical problem of uneven electrolyte distribution in existing systems.

[0005] In a first aspect, this application provides a bipolar plate comprising an electrode frame and an electrode plate located inside the electrode frame, the electrode frame being provided with a channel hole, the inner wall of the channel hole having a cross-sectional profile in the thickness direction of the electrode frame having more than two curvatures.

[0006] In an optional embodiment of this application, the electrode frame is provided with a guide groove communicating with the channel hole. The inner wall of the channel hole includes a first segment and a second segment that are interconnected in the circumferential direction of the channel hole. The channel hole communicates with the guide groove at the second segment. The first segment and / or the second segment of the inner wall have a cross-sectional profile with more than two curvatures in the thickness direction of the electrode frame.

[0007] In an optional embodiment of this application, the guide channel has a first sidewall and a second sidewall, which extend toward the electrode plate. The curvature of the cross-sectional profile of the second segment in the thickness direction of the electrode frame is set to either increase and then decrease from the second sidewall toward the first sidewall, or decrease and then increase; and / or, the distance between the first sidewall and the second sidewall increases from the channel hole toward the electrode plate.

[0008] In an optional embodiment of this application, the distance between the first sidewall and the second sidewall is set to increase progressively from the channel hole toward the electrode plate.

[0009] In an optional embodiment of this application, a plurality of first protrusions are provided on the bottom wall of the guide channel. The plurality of first protrusions are spaced apart along the second segment edge of the channel hole, and a first diversion channel communicating with the channel hole is formed between two adjacent first protrusions. The angle α between the extension direction of the first diversion channel, at least the portion near the channel hole, and the tangent direction of the second segment at the first diversion channel is 20° to 160°.

[0010] In an optional embodiment of this application, a plurality of second protrusions are further provided on the bottom wall of the guide channel. These second protrusions are located on the side of the first protrusion away from the channel hole. The second protrusions are spaced apart along the second segment, forming a second diversion channel between adjacent second protrusions. The second protrusions and / or the second diversion channels extend to the inner edge of the electrode frame near the electrode plate, and the second diversion channels communicate with the first diversion channels. Alternatively, the inlet of the second diversion channel is offset from the outlet of the first diversion channel; or, the plurality of second protrusions are spaced apart from the plurality of first protrusions to form a first converging channel, and the second diversion channels communicate with the first diversion channels through the first converging channel.

[0011] In an optional embodiment of this application, the surface of the electrode plate is provided with multiple rows of first papillae and multiple rows of second papillae, which are alternately arranged in a first direction. Multiple first papillae in each row of first papillae and multiple second papillae in each row of second papillae are respectively spaced apart along a second direction, and the first papillae and second papillae have different inclined extension directions relative to the first direction.

[0012] In an optional embodiment of this application, the angle β between the inclined extension direction of the first mastoid process relative to the first direction and the first direction is 20° to 70°.

[0013] In an optional embodiment of this application, the angle γ between the inclined extension direction of the second mastoid relative to the first direction and the first direction is 20° to 70°.

[0014] In an optional embodiment of this application, for two adjacent rows of first and second mastoids, each second mastoid is symmetrically or staggered with one of its adjacent first mastoids.

[0015] In an optional embodiment of this application, for two adjacent rows of first and second mastoids, the centers of the two adjacent first mastoids and the centers of the two adjacent second mastoids form a square; or, the centers of the two adjacent first mastoids and the center of the one adjacent second mastoid form a triangle.

[0016] In an optional embodiment of this application, for three adjacent rows of first and second mastoids, the mastoid centers of two adjacent second mastoids and the mastoid centers of adjacent first mastoids in two adjacent rows form a square; or, the mastoid center of one second mastoid and the mastoid centers of adjacent first mastoids in two adjacent rows form a triangle.

[0017] In a second aspect, this application provides an electrolytic cell comprising a plurality of stacked bipolar plates as described above.

[0018] In summary, the bipolar plate and electrolytic cell provided in this application have at least the following beneficial effects:

[0019] Because the inner wall of the channel hole on the bipolar plate has more than two curvatures in its axial cross-sectional profile, when the electrolyte enters the channel hole, its movement is no longer like that of a regular-shaped through-hole (circular or flat) where it flows directly from the inlet to the outlet along the axial direction. Instead, due to the varying curvature of the inner wall of the channel hole, the electrolyte can form a swirling flow along the tangent direction at different positions on the inner wall in the circumferential direction. This results in a certain degree of turbulence in the circumferential direction while the electrolyte moves axially along the channel hole; that is, the movement of the electrolyte is actually a vortex-like rotating forward motion. Therefore, based on this movement pattern, the electrolyte can be more evenly distributed into each electrolysis chamber, thereby reducing temperature differences between the chambers and improving temperature uniformity within each chamber, thus reducing energy consumption during electrolyte flow. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0021] Figure 1 A three-dimensional structural diagram of the bipolar plate provided in this application;

[0022] Figure 2 for Figure 1 A magnified view of a portion of the bipolar plate;

[0023] Figure 3 A schematic diagram of the coupling curve used for the cross-sectional profile of the channel hole provided in this application in its axial direction;

[0024] Figure 4 A schematic diagram of the bipolar plate provided in this application;

[0025] Figure 5 for Figure 4 A magnified view of a portion of the bipolar plate;

[0026] Figure 6 for Figure 5 A magnified view of a portion of the bipolar plate;

[0027] Figure 7 A schematic diagram showing the distribution of the first and second papillae on the bipolar plate provided in this application;

[0028] Figure 8 Another schematic diagram showing the distribution of the first and second mastoids on the bipolar plate provided in this application;

[0029] Figure 9 Another schematic diagram showing the distribution of the first and second papillae on the bipolar plate provided in this application;

[0030] Figure 10 This is another schematic diagram showing the distribution of the first and second papillae on the bipolar plate provided in this application.

[0031] The attached figures are labeled as follows:

[0032] 10. Electrode plate; 11. First mastoid process; 12. Second mastoid process;

[0033] 20. Electrode frame; 21. Channel hole; 22. Guide groove; 221. Bottom wall; 222. First side wall; 223. Second side wall; 23. First protrusion; 24. Second protrusion; T1. First diversion channel; T2. First confluence channel; T3. Second diversion channel;

[0034] S, inner wall; S1, first segment; S2, second segment;

[0035] D1, first direction; D2, second direction. Detailed Implementation

[0036] To make the above and other features and advantages of this application clearer, the present invention will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art and are exemplary only, not restrictive.

[0037] Furthermore, features specified with "first" or "second" for descriptive purposes only should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features specified with "first" or "second" may explicitly or implicitly include at least one of the specified features. The description of "multiple" generally means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] The electrolytic cell provided in this application includes a plurality of stacked bipolar plates 100 and a diaphragm (not shown) disposed between every two adjacent bipolar plates 100. In the installed state of the electrolytic cell, every two adjacent bipolar plates 100 and the diaphragm between them form an electrolytic chamber, which includes an anode chamber and a cathode chamber separated by the diaphragm. One side of the corresponding bipolar plate 100 is the anode surface, and the other side is the cathode surface.

[0039] The electrolytic cell in this embodiment uses a bipolar plate 100. Based on the structural design of the bipolar plate 100, electrolyte accumulation in local areas along the length of the electrolytic cell can be avoided, thereby improving the uniformity of electrolyte distribution in each electrolytic cell. This reduces the temperature difference between each electrolytic cell and further improves the temperature uniformity within each electrolytic cell.

[0040] Figure 1 This is a three-dimensional structural diagram of the bipolar plate provided in this application. Figure 2 for Figure 1 A magnified view of a portion of the bipolar plate.

[0041] Reference Figure 1 and Figure 2 The bipolar plate 100 provided in this application includes an electrode frame 20 and an electrode plate 10 located inside the electrode frame 20. The electrode plate 10 is connected to the electrode frame 20 inside the electrode frame 20 (e.g., by welding). Specifically, the electrode frame 20 can be integrally formed with the electrode plate 10, or it can be separately formed from the electrode plate 10 and then connected together.

[0042] The electrode frame 20 is provided with a channel hole 21, and the inner wall S of the channel hole 21 has more than two curvatures in any cross-sectional profile (also called cross-sectional shape) in the thickness direction of the electrode frame 20 (when the electrode frame 20 is annular, the thickness direction of the electrode frame 20 can be understood as the axial direction of the channel hole 21). That is, the inner wall S of the channel hole 21 has at least three curvatures in any cross-sectional profile in the axial direction of the channel hole 21.

[0043] The channel hole 21 is actually a through-hole structure with a constant inner diameter in its axial direction. Furthermore, the cross-sectional profile formed by the inner wall S of the channel hole 21 at any position in its axial direction has an irregular shape; it is neither circular nor flat (such as waist-shaped). Moreover, for any cross-sectional profile of the inner wall S of the channel hole 21 in its axial direction, the degree of curvature of this cross-sectional profile varies at different curvature positions; that is, the degree of curvature of the inner wall S of the channel hole 21 forming this cross-sectional profile varies at different curvature positions.

[0044] In addition, since the curvature of the straight line is 0, the cross-sectional profile can be formed by at least three arc segments with different curvatures, or by at least one straight line segment and at least two arc segments with different curvatures.

[0045] In this process, for any bipolar plate 100, the bipolar plate 100 receives the electrolyte supplied by an adjacent bipolar plate 100 through the channel hole 21 on the electrode frame 20 and supplies the electrolyte to its corresponding electrolysis chamber radially along the channel hole 21. At the same time, the bipolar plate 100 supplies the electrolyte to the other adjacent bipolar plate 100 axially through the channel hole 21, thereby realizing the electrolyte distribution of the electrolytic cell in its length direction, and the length direction of the electrolytic cell is parallel to the axial direction of the channel hole 21.

[0046] Since the inner wall S of the channel hole 21 on the bipolar plate 100 has more than two curvatures in any cross-sectional profile along the thickness direction of the electrode frame 20, when the electrolyte enters the channel hole 21, its movement within the channel hole 21 is no longer like that of a circular or flat through-hole, where it flows directly from the inlet end to the outlet end along the axial direction. Instead, based on the varying curvature of the inner wall S of the channel hole 21, the electrolyte can form a swirling flow along the tangent direction at different positions of the inner wall S in the circumferential direction of the channel hole 21. This results in a certain turbulent effect in the circumferential direction while the electrolyte moves axially along the channel hole 21; that is, the movement of the electrolyte is actually a vortex-like rotating forward motion. Therefore, based on this form of electrolyte movement, the electrolyte can be more evenly distributed into each electrolysis chamber, thereby reducing the temperature difference between the chambers and improving the temperature uniformity within each chamber, thus reducing energy consumption during electrolyte flow.

[0047] Figure 3 A schematic diagram of the coupling curve used for the cross-sectional profile of the inner wall S of the channel hole 21 provided in this application in the thickness direction of the electrode frame 20.

[0048] Understandably, the cross-sectional profile in this application is actually a closed curve. In an optional embodiment, referencing... Figure 3 The cross-sectional profile is formed by coupling the following curves F1, F2 and F3.

[0049] Among them, curve F1 is obtained in the following way: (1) using the Wittsinski curve. Where R is the cross-sectional radius, R1 is the inlet cross-sectional radius, x is the axial distance, and L is the cross-sectional length. cr (2) The R in the Wittsinski curve is the axial direction; cr Set to 5mm, R1 to 40mm, and L to 60mm to obtain curve F1, i.e., R=2*[1-99 / 100*(1-x^2 / 3600)*(1+x^2 / 10800)^(-3)]^(-3)](-0.5).

[0050] The curve F2 is: x^2 / 55^2 + y^2 / 25^2 = 1.

[0051] The curve F3 is: (x-30)^2+(y-10)^2=144, where the center of curve F3 is (30, 10) and the radius is 12.

[0052] Since the cross-sectional profile is obtained by coupling curves F1, F2, and F3 and rounding the corners at the transition, the electrolyte can vortex along the edge of the cross-sectional profile, which helps to create turbulence in the electrolyte. This results in a more uniform electrolyte concentration and allows the electrolyte to be evenly distributed into each electrolysis chamber along the circumferential tangent of the cross-sectional profile. Consequently, the average temperature difference in the electrolysis chamber is reduced by 0.5℃-1.5℃, thereby reducing energy consumption during the electrolyte flow process.

[0053] Figure 4 This is a schematic diagram of the bipolar plate provided in this application. Figure 5 for Figure 4 A magnified view of a portion of the bipolar plate. Figure 6 for Figure 5 A magnified view of a portion of the bipolar plate.

[0054] Reference Figure 2 as well as Figures 4 to 6 The electrode frame 20 has a guide groove 22 communicating with the channel hole 21 at one end in its thickness direction. The inner wall S of the channel hole 21 includes a first segment S1 and a second segment S2 that are interconnected in the circumferential direction of the channel hole 21, and the channel hole 21 communicates with the guide groove 22 at the second segment S2. The first segment S1 and / or the second segment S2 of the inner wall S of the channel hole 21 have more than two curvatures in their cross-sectional profiles in the thickness direction of the electrode frame 20. That is, the guide groove 22 is connected and communicates with the channel hole 21 at the second segment S2 of the inner wall S of the channel hole 21, meaning that the guide groove 22 and the channel hole 21 have a boundary (or junction) position at the second segment S2.

[0055] Since the first segment S1 and / or the second segment S2 of the inner wall of the channel hole 21 have more than two curvatures in the cross-sectional profile in the thickness direction of the electrode frame 20, and there is a boundary between the channel hole 21 and the guide groove 22 at the second segment S2 of the inner wall S, when the electrolyte moves to the boundary, the axial channel hole 21 and the radial guide groove 22 cooperate, so that the electrolyte can be thrown into the guide groove 22 when it moves along the circumferential tangent direction of the boundary at the boundary. This further enhances the turbulence effect of the electrolyte, improves the temperature uniformity of each electrolysis chamber, and thus reduces the energy consumption during the electrolyte flow process.

[0056] Additionally, it should be noted that since the inner wall S of the channel hole 21 includes a first segment S1 and a second segment S2 that are interconnected in the circumferential direction of the channel hole 21, any cross-sectional profile of the inner wall S of the channel hole 21 in the axial direction of the channel hole 21 must include two curves corresponding to the first segment S1 and the second segment S2, and these two curves together form a closed curve profile.

[0057] Understandably, for any cross-sectional profile of the inner wall S of the channel hole 21 in the axial direction of the channel hole 21, the cross-sectional profile may have more than two curvatures only in the profile portion corresponding to the first segment S1, or more than two curvatures only in the profile portion corresponding to the second segment S2. Of course, the cross-sectional profile may also have more than two curvatures in both the profile portions corresponding to the second segment S2 and the first segment S1.

[0058] Reference Figure 2 The guide channel 22 has a first sidewall 222 and a second sidewall 223, which extend from different portions of the channel hole 21 toward the electrode plate 10. That is, the first sidewall 222 and the second sidewall 223 are connected to the inner wall S at different positions of the channel hole 21. In other words, the second segment S2 of the inner wall S of the channel hole 21 is located between the first sidewall 222 and the second sidewall 223 in the circumferential direction of the channel hole 21.

[0059] In this design, the curvature of the second segment S2 of the inner wall S of the channel hole 21 along the axial direction of the channel hole 21 is set to either increase and then decrease, or decrease and then increase, from the second sidewall 223 towards the first sidewall 222. Since one curvature corresponds to one arc segment, the cross-sectional profile of the second segment S2 actually includes multiple sequentially connected arc segments. By gradually changing the curvature of these multiple arc segments, the electrolyte can form a swirling flow along the inner wall of the channel hole 21 in the same direction in the circumferential direction, thereby enhancing the turbulence effect of the electrolyte within the channel hole 21.

[0060] Reference Figure 2 , Figure 4 and Figure 5The spacing between the first sidewall 222 and the second sidewall 223 gradually increases from the channel hole 21 toward the electrode plate 10. Here, "the spacing between the first sidewall 222 and the second sidewall 223" refers to the distance between the intersection of a concentric arc of the electrode plate 10 on the electrode frame and the first sidewall 222 and the second sidewall 223. That is, the first sidewall 222 and the second sidewall 223 form a fan-shaped area or an approximately "V"-shaped area, which significantly increases the radial flow area of ​​the electrolyte in the channel hole 21 before it enters the electrolysis chamber. This facilitates the uniform flow of the electrolyte through the guide groove 22 to different areas of the electrolysis chamber, improving the uniformity of the electrolyte within the electrolysis chamber.

[0061] Reference Figure 2 and Figure 6 Multiple first protrusions 23 are provided on the bottom wall 221 of the guide channel 22. The multiple first protrusions 23 are spaced apart along the edge of the second segment S2, and a first diversion channel T1 communicating with the channel hole 21 is formed between two adjacent first protrusions 23. The angle α between the extending direction of at least the portion of the first diversion channel T1 near the channel hole 21 and the tangential direction of the second segment S2 at the first diversion channel T1 is 20° to 160°.

[0062] Understandably, the first diversion channel T1 can extend in the same direction as a whole, and the angle between the extension direction of the first diversion channel T1 and the tangential direction of the second segment S2 at the first diversion channel T1 is α. Of course, the first diversion channel T1 can also include two parts with different extension directions, wherein the extension direction of the part closer to the channel hole 21 and the tangential direction of the second segment S2 at the first diversion channel T1 are at the same angle.

[0063] For example, the "angle α" here can be 20°, 30°, 35°, 40°, 45°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, etc. This angle setting reflects that the extension direction of the first diversion channel T1 can be towards or away from the electrode plate 10. The purpose is to allow the electrolyte to disperse and flow into the chamber where the electrode plate 10 is located, while avoiding the problem of insufficient turbulence effect due to an angle α that is too small, and the problem of electrolyte transmission between the channel holes 21 being too large, both of which can be avoided.

[0064] Specifically, at least two channel holes 21 and two guide grooves 22 are provided, with each guide groove 22 corresponding to a channel hole 21. For example, the electrode plate 10 is circular. When two channel holes 21 and two guide grooves 22 are provided, the two channel holes 21 are symmetrically distributed along the central axis of the electrode plate 10, and the two guide grooves 22 are also symmetrically distributed along the central axis of the electrode plate 10.

[0065] Reference Figure 2 and Figure 5 Multiple second protrusions 24 are also provided on the bottom wall 221 of the flow channel 22. The multiple second protrusions 24 are located on the side of the first protrusion 23 away from the channel hole 21. A second diversion channel T3 is formed between two adjacent second protrusions 24. The second protrusions 24 and / or the second diversion channel T3 extend to the inner edge of the electrode frame 20 near the electrode plate 10.

[0066] In an optional embodiment, the first diversion channel T1 and / or the second diversion channel T3 may be curved, or may include a portion of straight sections and a portion of curved sections, that is, the above-mentioned diversion channels have a curvature of more than one.

[0067] In an optional embodiment, a plurality of second protrusions 24 are respectively connected to a plurality of first protrusions 23 in a one-to-one correspondence (that is, each second protrusion 24 is connected to a corresponding first protrusion 23). Here, the connection refers to at least one part of the protrusion portion being connected together, except for the bottom wall connection, so that a second protrusion 24 and a first protrusion 23 become one unit. At this time, the second diversion channel T3 and the first diversion channel T1 become an uninterrupted through channel.

[0068] In an optional embodiment, the inlet of the second diversion channel T3 is offset from the outlet of its opposite first diversion channel T1. The multiple first diversion channels T1 in the guide channel 22 respectively receive the electrolyte distributed by the channel orifice 21. Because the inlet of the second diversion channel T3 is offset from the outlet of the first diversion channel T1, the electrolyte undergoes secondary distribution before flowing from the inlet of the first diversion channel T1 into the second diversion channel T3, further enhancing the mixing and distribution effect.

[0069] In another alternative embodiment, the plurality of second protrusions 24 may also be spaced apart from the plurality of first protrusions 23 to form a first confluence channel T2 between them. The second diversion channel T3 is indirectly connected to the first diversion channel T1 through the first confluence channel T2. The inlet of the second diversion channel T3 may be misaligned with the outlet of the first diversion channel T1 or may not be misaligned.

[0070] In this embodiment, the multiple first diversion channels T1 in the flow guide trough 22 respectively receive the electrolyte distributed by the channel holes 21. Then, the electrolyte in the multiple first diversion channels T1 first enters the first confluence channel T2 and then merges before being redistributed to the electrolysis chamber via multiple second diversion channels T3. This secondary distribution method can improve the electrolyte uniformity and temperature uniformity in different areas of the flow guide trough 22.

[0071] When the inlet of the second diversion channel T3 and the outlet of the first diversion channel T1 are not misaligned, the electrolyte flowing out of the outlet of the first diversion channel T1 will not be blocked by the second protrusion 24 after entering the first confluence channel T2, and can directly enter the second diversion channel T3, thereby ensuring the flow rate of the electrolyte in the guide groove 22.

[0072] When the inlet of the second diversion channel T3 is misaligned with the outlet of the first diversion channel T1, the electrolyte flowing out of the outlet of the first diversion channel T1 enters the first confluence channel T2. At least a portion of the electrolyte is stopped by the second protrusion 24 and can merge with the electrolyte flowing out of the other first diversion channels T1 in the first confluence channel T2. This ensures the uniformity of the flow field and temperature of the electrolyte in different areas of the guide channel 22.

[0073] Of course, in order to further improve the electrolyte uniformity and temperature uniformity in different areas of the guide channel 22, multiple third protrusions (the third protrusion is located on the side of the second protrusion 24 away from the channel hole 21) and fourth protrusions (the fourth protrusion is located on the side of the third protrusion away from the channel hole 21) can also be provided on the bottom wall 221 of the guide channel 22. The relative positional relationship between the third protrusion and the second protrusion 24 is similar to the relative positional relationship between the second protrusion 24 and the first protrusion 23, and the relative positional relationship between the fourth protrusion and the third protrusion is similar to the relative positional relationship between the third protrusion and the first protrusion 23. The relative positional relationship between the two protrusions 24 is similar. This embodiment can be understood as follows: multiple second protrusions 24 are spaced apart in the extension direction of the electrode frame 20 near the inner edge of the electrode plate 10 to form multiple protrusions, thereby forming a multi-segment protrusion structure such as the third protrusion, the fourth protrusion, etc. The third protrusion and the fourth protrusion form a merging channel, and so on, multiple merging channels can be formed. Each merging channel is staggered with the second diversion channel T3, and the stagger angle can be adjusted according to the actual diversion effect, ultimately forming a network-type liquid flow channel.

[0074] In addition, in an optional embodiment, the outlet of the diversion channel section between two adjacent third protrusions and the inlet of the diversion channel section between two adjacent fourth protrusions can be staggered or non-staggered. The technical effects of the above-mentioned configuration are described in the foregoing embodiments and will not be repeated here.

[0075] Figure 7 This is a schematic diagram showing the distribution of the first and second papillae on the bipolar plate provided in this application. Figure 8 This is another schematic diagram showing the distribution of the first and second papillae on the bipolar plate provided in this application. Figure 9 This is another schematic diagram showing the distribution of the first and second papillae on the bipolar plate provided in this application. Figure 10This is another schematic diagram showing the distribution of the first and second papillae on the bipolar plate provided in this application.

[0076] Reference Figures 7 to 10 The surface of the electrode plate 10 is provided with multiple rows of first papillae 11 and multiple rows of second papillae 12, which are alternately arranged in a first direction D1 of the electrode plate 10. Each row of first papillae 11 and each row of second papillae 12 is spaced apart along a second direction D2 of the electrode plate 10, and the first papillae 11 and second papillae 12 extend in different directions relative to the first direction D1. The first direction D1 and the second direction D2 are the directions of two mutually perpendicular diameters of the electrode plate 10, and the first direction D1 is also the central axis of the entire bipolar plate 100 in this application.

[0077] By setting first protrusions 11 and second protrusions 12 with different inclined extension directions relative to the first direction D1, a guiding effect can be provided for the electrolyte in the electrolysis chamber, allowing the electrolyte entering the electrolysis chamber to diffuse to the surrounding area. This results in a wider flow area for the electrolyte in the electrolysis chamber, thereby improving the uniformity of the electrolyte flow field distribution and thus enhancing the temperature uniformity within the electrolysis chamber and reducing energy consumption during electrolyte flow. Furthermore, the first protrusions 11 and second protrusions 12 can be manufactured by stamping, enabling rapid mass production. Simultaneously, the first protrusions 11 and second protrusions 12 can replace the traditional support mesh, thereby reducing material costs and the interfacial resistance for current transmission.

[0078] In some embodiments, refer to Figure 7 The angle β between the inclined extension direction of the first mastoid 11 relative to the first direction D1 and the first direction D1 is 20° to 70°. Specifically, the angle β can be 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 70°, etc.

[0079] Here, "angle β" is the acute angle between the inclined extension direction of the first papilla 11 relative to the first direction D1 and the first direction D1. Setting the angle β within the above range can ensure the degree of diffusion of the electrolyte to the periphery of the first papilla 11 and the flow velocity of the electrolyte between the first papilla 11 and the second papilla 12, thereby reducing gas accumulation in the electrolytic cell and enabling the gas in the electrolytic cell to be discharged in a timely and effective manner, effectively reducing the gas production in the stagnation zone by about 10% to 20%.

[0080] Similarly, refer to Figure 7The angle γ between the inclined extension direction of the second mastoid 12 relative to the first direction D1 and the first direction D1 is 20° to 70°. Specifically, the angle γ can be 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 70°, etc.

[0081] Here, "angle γ" is the acute angle between the inclined extension direction of the second papilla 12 relative to the first direction D1 and the first direction D1. Setting the angle γ within the above range can ensure the degree of electrolyte diffusion to the periphery of the second papilla 12 and the flow velocity of the electrolyte between the first papilla 11 and the second papilla 12, thereby reducing gas accumulation in the electrolytic cell and enabling the gas in the electrolytic cell to be discharged in a timely and effective manner, effectively reducing the gas production in the stagnation zone by about 10% to 20%.

[0082] For example, different arrangement angles will be selected based on the number of electrolysis chambers, the electrolyte circulation rate, and the gas production rate. For instance, if the gas production rate of the electrolytic cell is between 800 and 1000 Nm³, the arrangement angle may be chosen accordingly. 3 When the flow rate is / h, the included angle β and / or included angle γ can be set to 20°~30°; the gas production rate of the electrolytic cell is 600~800Nm³. 3 When the gas production rate is / h, the included angle β and / or included angle γ can be set to 30°~35°. The gas production rate of the electrolytic cell is less than 600Nm³. 3 When / h, the included angle β and / or included angle γ can be set to 30° to 70°.

[0083] In some embodiments, the angle between the inclined extension direction of the first mastoid 11 and the inclined extension direction of the second mastoid 12 can be 60° or 90°.

[0084] Reference Figures 7 to 10 For two adjacent rows of first mastoids 11 and second mastoids 12, each second mastoid 12 is symmetrically or staggered with its adjacent first mastoid 11.

[0085] Understandably, "each second mastoid 12 is symmetrically arranged with its adjacent first mastoid 11" means that each second mastoid 12 and its adjacent first mastoid 11 are spaced apart in the first direction D1, and that they can completely overlap after folding along the center line between them (the center line between them is the perpendicular bisector of the line connecting the lowest point of the second mastoid and the highest point of the first mastoid, and this center line is parallel to the second direction D2). That is, each second mastoid 12 and its adjacent first mastoid 11 are symmetrically arranged about their center (also known as being directly opposite each other). Figure 9As shown; while "each second mastoid 12 is staggered with its adjacent first mastoid 11" means that each second mastoid 12 is spaced apart from its adjacent first mastoid 11 in the first direction D1, and each second mastoid 12 is located between two adjacent first mastoids 11 in the second direction D2, as shown. Figure 7 , Figure 8 and Figure 10 As shown.

[0086] In some alternative embodiments, refer to Figure 7 For two adjacent rows of first mastoids 11 and second mastoids 12, each second mastoid 12 is staggered with its adjacent first mastoid 11, and the line connecting the mastoid centers of two adjacent first mastoids 11 and the mastoid centers of their adjacent second mastoids 12 forms an equilateral triangle.

[0087] In some alternative embodiments, refer to Figure 8 For the three adjacent rows of first mastoids 11 and second mastoids 12, taking one row of second mastoids 12 and two rows of first mastoids 11 as an example, each second mastoid 12 and its adjacent first mastoids 11 in the two adjacent rows are staggered. The line connecting the center of a second mastoid 12 and the center of its adjacent first mastoids 11 in the two adjacent rows forms an equilateral triangle.

[0088] In some alternative embodiments, refer to Figure 9 For two adjacent rows of first mastoids 11 and second mastoids 12, each second mastoid 12 and its adjacent first mastoid 11 are arranged symmetrically about their centers, and the line connecting the mastoid centers of two adjacent first mastoids 11 and the mastoid centers of two adjacent second mastoids 12 forms a square.

[0089] In some alternative embodiments, refer to Figure 10 For the three adjacent rows of first mastoids 11 and second mastoids 12, taking one row of second mastoids 12 and two rows of first mastoids 11 as an example, each second mastoid 12 and its adjacent first mastoids 11 in the two adjacent rows are staggered, and the line connecting the mastoid centers of two adjacent second mastoids 12 and the mastoid centers of their adjacent first mastoids 11 in the two adjacent rows forms a square.

[0090] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A bipolar plate, characterized in that, Includes an electrode frame (20) and an electrode plate (10) located inside the electrode frame (20); The electrode frame (20) is provided with a channel hole (21) and a guide groove (22) communicating with the channel hole (21). The inner wall (S) of the channel hole (21) includes a first section (S1) and a second section (S2) that are connected to each other in the circumferential direction of the channel hole (21), and the channel hole (21) communicates with the guide groove (22) at the second section (S2); Among them, at least one of the first segment (S1) and the second segment (S2) of the inner wall (S) has a cross-sectional profile with more than two curvatures in the thickness direction of the electrode frame (20).

2. The bipolar plate according to claim 1, characterized in that, The guide channel (22) has a first sidewall (222) and a second sidewall (223), the first sidewall (222) and the second sidewall (223) extending toward the electrode plate (10); The curvature of the cross-sectional profile of the second segment (S2) in the thickness direction of the electrode frame (20) is set to either increase and then decrease or decrease and then increase from the second sidewall (223) toward the first sidewall (222); and / or The distance between the first sidewall (222) and the second sidewall (223) increases from the channel hole (21) toward the electrode plate (10).

3. The bipolar plate according to claim 1, characterized in that, The bottom wall (221) of the guide groove (22) is provided with a plurality of first protrusions (23). The plurality of first protrusions (23) are spaced apart along the edge of the second segment (S2) of the channel hole (21), and a first diversion channel (T1) communicating with the channel hole (21) is formed between two adjacent first protrusions (23). The angle α between the extension direction of the first diversion channel (T1) at least the portion near the channel hole (21) and the tangential direction of the second segment (S2) at the first diversion channel (T1) is 20° to 160°.

4. The bipolar plate according to claim 3, characterized in that, The bottom wall (221) of the flow channel (22) is also provided with a plurality of second protrusions (24). The plurality of second protrusions (24) are located on the side of the first protrusion (23) away from the channel hole (21), and a second diversion channel (T3) is formed between two adjacent second protrusions (24). Wherein, the second protrusion (24) and / or the second diversion channel (T3) extends to the inner edge of the electrode frame (20) near the electrode plate (10), and the second diversion channel (T3) communicates with the first diversion channel (T1); and / or The inlet of the second diversion channel (T3) is offset from the outlet of the first diversion channel (T1); and / or Multiple second protrusions are spaced apart from multiple first protrusions (23) to form a first confluence channel (T2), and the second diversion channel (T3) is connected to the first diversion channel (T1) through the first confluence channel (T2).

5. The bipolar plate according to any one of claims 1-4, characterized in that, The surface of the electrode plate (10) is provided with multiple rows of first papillae (11) and multiple rows of second papillae (12), which are arranged alternately in a first direction (D1); The plurality of first mastoids (11) in each row of first mastoids (11) and the plurality of second mastoids (12) in each row of second mastoids (12) are respectively arranged at intervals along the second direction (D2), and the first mastoids (11) and the second mastoids (12) have different inclined extension directions relative to the first direction (D1).

6. The bipolar plate according to claim 5, characterized in that, The angle β between the oblique extension direction of the first mastoid process (11) relative to the first direction (D1) and the first direction (D1) is 20°~70°; and / or The angle γ between the inclined extension direction of the second mastoid (12) relative to the first direction (D1) and the first direction (D1) is 20°~70°.

7. The bipolar plate according to claim 5, characterized in that, For two adjacent rows of first mastoids (11) and second mastoids (12), each second mastoid (12) is symmetrically or staggered with one of its adjacent first mastoids (11).

8. The bipolar plate according to claim 5, characterized in that, For two adjacent rows of first mastoids (11) and second mastoids (12), the centers of the mastoids of two adjacent first mastoids (11) and the centers of the mastoids of two adjacent second mastoids (12) form a square, or the centers of the mastoids of two adjacent first mastoids (11) and the center of the mastoids of one adjacent second mastoid (12) form a triangle; or For three adjacent rows of first mastoids (11) and second mastoids (12), the mastoid centers of two adjacent second mastoids (12) and the mastoid centers of the adjacent first mastoids (11) in the two adjacent rows form a square, or the mastoid center of one second mastoid (12) and the mastoid centers of the adjacent first mastoids (11) in the two adjacent rows form a triangle.

9. An electrolytic cell, characterized in that, Includes several bipolar plates as described in any one of claims 1-8, arranged in a stacked configuration.

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