Bipolar plate and electrolytic bath

Abstract

The utility model provides a bipolar plate and electrolytic bath relates to hydrogen production equipment technical field, the bipolar plate has anode face and cathode face, the anode face includes first anode distribution area and second anode distribution area, the first anode distribution area is equipped with first convex part, the second anode distribution area is equipped with second convex part, the cathode surface comprises a first cathode distribution area opposite to the first anode distribution area and a second cathode distribution area opposite to the second anode distribution area in the thickness direction of the bipolar plate, the first cathode distribution area is provided with a third convex part, the second cathode distribution area is provided with a fourth convex part, and when the two bipolar plates are stacked, the third convex part and the fourth convex part are separated from each other. The first convex part of one bipolar plate is overlapped with the fourth convex part of the other bipolar plate, and the second convex part of one bipolar plate is overlapped with the third convex part of the other bipolar plate. The weight and the size of the bipolar plate can be effectively reduced, the supporting strength of the bipolar plate is improved, and the production and manufacturing cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen production equipment technology, and more specifically, to a bipolar plate and an electrolyzer. Background Technology

[0002] Electrolyzers are among the most commonly used hydrogen production equipment. Among various types of electrolyzers, PEM electrolyzers are widely used due to their high efficiency and safety. In PEM electrolyzers, the bipolar plates account for approximately 60-80% of the weight / volume and 30-53% of the cost. Therefore, with the continuous development of electrolyzer technology, lightweight design and low-cost manufacturing of bipolar plates are becoming increasingly important, while still meeting basic functional requirements such as structural support and uniform flow distribution.

[0003] Currently, bipolar plates are usually designed with thinner plates to reduce costs, but thinner plates are more prone to deformation, which can affect the support strength of the bipolar plates after stacking. Utility Model Content

[0004] The problem this invention addresses is: how to improve the support strength of stacked bipolar plates.

[0005] To solve the above problems, this utility model provides a bipolar plate and an electrolytic cell.

[0006] In a first aspect, the present invention provides a bipolar plate having an anode surface and a cathode surface. The anode surface includes a first anode distribution area and a second anode distribution area. The first anode distribution area has a first protrusion, and the second anode distribution area has a second protrusion. The cathode surface includes a first cathode distribution area opposite to the first anode distribution area and a second cathode distribution area opposite to the second anode distribution area in the thickness direction of the bipolar plate. The first cathode distribution area has a third protrusion, and the second cathode distribution area has a fourth protrusion. When two bipolar plates are stacked, the first protrusion of one bipolar plate overlaps with the fourth protrusion of the other bipolar plate, and the second protrusion of one bipolar plate overlaps with the third protrusion of the other bipolar plate.

[0007] Optionally, a first recess is formed in the first cathode distribution area at a position opposite to the first protrusion; and / or,

[0008] A second recess is formed in the second cathode distribution area at a position opposite to the second protrusion; and / or,

[0009] A third recess is formed in the first anode distribution area at a position opposite to the third protrusion; and / or,

[0010] A fourth recess is formed in the second anode distribution area at a position opposite to the fourth protrusion.

[0011] Optionally, the anode surface further includes an anode reaction zone located between the first anode distribution zone and the second anode distribution zone, the anode reaction zone being provided with a plurality of first flow channel grooves;

[0012] The cathode surface also includes a cathode reaction region located between the first cathode distribution region and the second cathode distribution region, and the cathode reaction region is provided with a plurality of second flow channel grooves.

[0013] Optionally, the projections of the plurality of first flow channel grooves on the bipolar plate and the projections of the plurality of second flow channel grooves on the bipolar plate are arranged alternately.

[0014] Optionally, a first flow channel ridge is provided on the cathode reaction region at a position opposite to the first flow channel groove; and / or,

[0015] A second flow channel ridge is provided on the anode reaction zone at a position opposite to the second flow channel groove.

[0016] Optionally, the anode reaction region has a first anode side and a second anode side, the first anode side has a first convex surface, and the second anode side has a second convex surface. The cathode reaction region has a first cathode side opposite to the first anode side and a second cathode side opposite to the second anode side in the thickness direction of the bipolar plate. The first cathode side has a third convex surface, and the second cathode side has a fourth convex surface. When two bipolar plates are stacked, the first convex surface of one bipolar plate overlaps with the fourth convex surface of the other bipolar plate, and the second convex surface of one bipolar plate overlaps with the third convex surface of the other bipolar plate.

[0017] Optionally, a first concave surface is provided on the first cathode side opposite to the first convex surface; and / or,

[0018] A second concave surface is provided on the second cathode side at a position opposite to the second convex surface; and / or,

[0019] A third concave surface is provided on the first anode side at a position opposite to the third convex surface; and / or,

[0020] A fourth concave surface is provided on the second anode side at a position opposite to the fourth convex surface.

[0021] Optionally, the first anode distribution area is provided with a plurality of first protrusions spaced apart along its edge, the second anode distribution area is provided with a plurality of second protrusions spaced apart along its edge, the first cathode distribution area is provided with a plurality of third protrusions spaced apart along its edge, and the second cathode distribution area is provided with a plurality of fourth protrusions spaced apart along its edge. When the two bipolar plates are stacked, the plurality of first protrusions overlap with the plurality of fourth protrusions, and the plurality of second protrusions overlap with the plurality of third protrusions.

[0022] Optionally, the first cathode distribution region is recessed to form a first groove, so that the first protrusion is formed in the first anode distribution region corresponding to the first groove; and / or,

[0023] The second cathode distribution region is recessed to form a second groove, so that the second protrusion is formed in the second anode distribution region corresponding to the second groove; and / or,

[0024] The first anode distribution region is recessed to form a third groove, so that a third protrusion is formed in the first cathode distribution region corresponding to the third groove; and / or,

[0025] The second anode distribution area is recessed to form a fourth groove, so that the fourth protrusion is formed in the second cathode distribution area corresponding to the fourth groove.

[0026] Secondly, this utility model provides an electrolytic cell, including the bipolar plate as described above.

[0027] The beneficial effects of this bipolar plate are as follows: By providing a first protrusion in the first anode distribution area on the anode surface, a second protrusion in the second anode distribution area, and a third protrusion in the first cathode distribution area and a fourth protrusion in the second cathode distribution area on the cathode surface, when two bipolar plates are stacked, the second protrusion of one bipolar plate can overlap with the third protrusion of the other bipolar plate, and vice versa. This achieves mutual support between the two bipolar plates, thereby improving their resistance to deformation and thus increasing their support strength. Furthermore, the stacking of the two bipolar plates through the overlap of the protrusions, compared to the previous method of stacking by overlapping the protrusions with the grooves, can prevent the membrane electrode from being locally squeezed into the grooves, thereby reducing the risk of membrane electrode collapse. Moreover, since each distribution area is provided with a corresponding protrusion, the protrusion can achieve weak guiding distribution of the gas and liquid flowing on the bipolar plates. Compared to strong guiding distribution, weak guiding can improve the uniformity of gas and liquid distribution and improve the heat and mass transfer effect. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the anode surface of the bipolar plate in an embodiment of the present invention;

[0029] Figure 2 This is a partial schematic diagram of the first anode distribution area of ​​the bipolar plate in an embodiment of the present invention;

[0030] Figure 3 for Figure 2 A magnified schematic diagram of part A in the middle;

[0031] Figure 4 This is a partial schematic diagram of the second anode distribution region of the bipolar plate in an embodiment of the present invention;

[0032] Figure 5 for Figure 4 A magnified schematic diagram of part B in the middle;

[0033] Figure 6 This is a schematic diagram of the cathode surface of the bipolar plate in an embodiment of the present invention;

[0034] Figure 7 This is a partial schematic diagram of the first cathode distribution area of ​​the bipolar plate in an embodiment of the present invention;

[0035] Figure 8 for Figure 7 A magnified schematic diagram of part C in the middle;

[0036] Figure 9 This is a partial schematic diagram of the second cathode distribution area of ​​the bipolar plate in an embodiment of the present invention;

[0037] Figure 10 for Figure 9 Enlarged schematic diagram of part D in the middle

[0038] Figure 11 This is a schematic diagram of the overlap between the first protrusion and the fourth protrusion in an embodiment of the present invention;

[0039] Figure 12 This is a schematic diagram of the stacking of two bipolar plates according to an embodiment of the present invention;

[0040] Figure 13 for Figure 12 Top view of two bipolar plates stacked together;

[0041] Figure 14 This is a partial structural diagram of the anode reaction zone on the first anode side according to an embodiment of the present invention;

[0042] Figure 15 This is a partial structural diagram of the anode reaction zone on the second anode side in an embodiment of the present invention;

[0043] Figure 16 This is a partial structural diagram of the cathode reaction region on the first cathode side in an embodiment of the present invention;

[0044] Figure 17This is a partial structural diagram of the cathode reaction region on the second cathode side in an embodiment of the present invention;

[0045] Figure 18 This is a schematic diagram of the overlap between the first convex surface and the fourth convex surface in an embodiment of the present invention;

[0046] Figure 19 This is a schematic diagram of the overlap between the second and third convex surfaces in an embodiment of the present invention;

[0047] Figure 20 This is a schematic diagram showing the overlap of the first protrusion and the fourth protrusion at the edge of the distribution area away from the reaction area in an embodiment of the present invention.

[0048] Figure 21 This is a schematic diagram showing the overlap of the first protrusion and the fourth protrusion at the edge of the distribution area near the reaction area in an embodiment of the present invention.

[0049] Figure 22 This is a schematic diagram of the structure of the electrolytic cell according to an embodiment of the present invention;

[0050] Figure 23 for Figure 22 Enlarged schematic diagram of part E of the electrolytic cell.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1. Anode surface; 11. First anode distribution area; 111. First convex portion; 112. Third concave portion; 113. First protrusion; 114. Third groove; 12. Second anode distribution area; 121. Second convex portion; 122. Fourth concave portion; 123. Second protrusion; 124. Fourth groove; 13. Anode reaction area; 131. First flow channel groove; 132. Second flow channel ridge; 133. First convex surface; 134. Second convex surface; 135. Third concave surface; 136. Fourth concave surface; 2. Cathode surface; 21. First cathode distribution area; 211. Third convex portion; 212. First concave portion; 213. Third protrusion; 2 14. First groove; 22. Second cathode distribution area; 221. Fourth convex part; 222. Second concave part; 223. Fourth protrusion; 224. Second groove; 23. Cathode reaction area; 231. Second flow channel groove; 232. First flow channel ridge; 233. Third convex surface; 234. Fourth convex surface; 235. First concave surface; 236. Second concave surface; 3. Reaction water inlet; 4. Reaction water and oxygen outlet; 5. Hydrogen outlet; 6. Positioning hole; 7. Inspection interface; 81. Base; 82. End plate; 83. Insulating plate; 84. Bipolar plate; 85. Screw; 86. Disc spring; 87. Nut; 88. Collector plate. Detailed Implementation

[0053] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0054] In the attached diagram, the Z-axis represents the vertical direction, i.e., up and down, with the positive direction of the Z-axis representing up and the negative direction representing down. The X-axis represents the horizontal direction and is designated as the front and back position, with the positive direction of the X-axis representing the front and the negative direction representing the back. The Y-axis represents the left and right position, with the positive direction of the Y-axis representing the left and the negative direction representing the right. It should be noted that the aforementioned representations of the Z, Y, and X axes are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0055] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0056] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0057] This invention provides a bipolar plate and an electrolytic cell to improve the support strength of the bipolar plate after stacking. Detailed description follows with reference to specific embodiments.

[0058] like Figures 1 to 7 As shown in the figure, an embodiment of the present invention provides a bipolar plate, the bipolar plate having an anode surface 1 and a cathode surface 2, the anode surface 1 including a first anode distribution area 11 and a second anode distribution area 12 (see details). Figure 1The first anode distribution area 11 is provided with a first protrusion 111 (see details). Figure 2 and Figure 3 The second anode distribution area 12 is provided with a second protrusion 121 (see details). Figure 4 and Figure 5 The cathode surface 2 includes a first cathode distribution region 21 opposite to the first anode distribution region 11 and a second cathode distribution region 22 opposite to the second anode distribution region 12 in the thickness direction of the bipolar plate (see details). Figure 6 The first cathode distribution area 21 is provided with a third protrusion 211 (see details). Figure 7 and Figure 8 The second cathode distribution area 22 is provided with a fourth protrusion 221 (see details). Figure 9 and Figure 10 When two bipolar plates are stacked, the first protrusion 111 of one bipolar plate overlaps with the fourth protrusion 221 of the other bipolar plate (see details). Figure 11 The second protrusion 121 of one of the bipolar plates overlaps with the third protrusion 211 of the other bipolar plate.

[0059] The first protrusion 111, the second protrusion 121, the third protrusion 211, and the fourth protrusion 221 can each be provided in multiples to achieve better mutual support. Furthermore, the cross-sectional shape of the protrusion can be selected from circles and rounded rectangles (rectangles with arc-shaped sides). In addition, the cross-sectional shapes of all protrusions in the same distribution area can be completely the same or partially the same, without any restrictions.

[0060] It should be noted that the aforementioned stacking of two bipolar plates refers to one bipolar plate being placed on top of the other. However, bipolar plates are usually placed on top of each other via a membrane electrode assembly (MEA), meaning there is a MEA between the two bipolar plates. The two bipolar plates are not in direct contact. Furthermore, when the two bipolar plates are stacked, the anode surface 1 of one bipolar plate faces the cathode surface 2 of the other bipolar plate. The first anode distribution region 11 of one bipolar plate is exactly opposite to the second cathode distribution region 22 of the other bipolar plate, and the second anode distribution region 12 of one bipolar plate is exactly opposite to the first cathode distribution region 21 of the other bipolar plate. For easier understanding, please refer to... Figure 12 and Figure 13 The specific stacking process is as follows: In Figure 12 In the process, the upper bipolar plate is first rotated 180° around its center line in the direction shown by the arrow, and then placed on top of the lower bipolar plate to achieve stacking, resulting in... Figure 13 The stacked top view shown.

[0061] In this embodiment, a first protrusion 111 is provided in the first anode distribution area 11 of the anode surface 1, a second protrusion 121 is provided in the second anode distribution area 12, and a third protrusion 211 is provided in the first cathode distribution area 21 of the cathode surface 2, and a fourth protrusion 221 is provided in the second cathode distribution area 22. Thus, when two bipolar plates are stacked, the second protrusion 121 of one bipolar plate can overlap with the third protrusion 211 of the other bipolar plate, and vice versa. This achieves mutual support between the two bipolar plates, thereby improving their resistance to deformation and increasing their support strength. Furthermore, the stacking of the two bipolar plates through the overlap of the protrusions, compared to the previous method of stacking by overlapping the protrusions and grooves, prevents the membrane electrode from being locally squeezed into the groove, thereby reducing the risk of membrane electrode collapse. Furthermore, since each distribution zone is equipped with a corresponding protrusion, the protrusion can achieve weak guiding distribution of the gas and liquid flowing on the bipolar plate. Compared with strong guiding distribution, weak guiding can improve the uniformity of gas and liquid distribution and improve the heat and mass transfer effect.

[0062] Optionally, such as Figure 7 and Figure 8 As shown, a first recess 212 is formed on the first cathode distribution area 21 at a position opposite to the first protrusion 111; and / or, as Figure 9 and Figure 10 As shown, a second recess 222 is formed on the second cathode distribution region 22 at a position opposite to the second protrusion 121; and / or, as Figure 2 and Figure 3 As shown, a third recess 112 is formed on the first anode distribution area 11 at a position opposite to the third protrusion 211; and / or, as Figure 4 and Figure 5 As shown, a fourth recess 122 is formed on the second anode distribution area 12 at a position opposite to the fourth protrusion 221.

[0063] It should be noted that, regarding the processing method of the first concave portion 212 and the first convex portion 111, the first concave portion 212 can be stamped out on the plate surface where the first cathode distribution area 21 is located, so that the plate surface where the first anode distribution area 11 is located is correspondingly arched, thus obtaining the first convex portion 111. In this way, the first concave portion 212 and the first convex portion 111 can be obtained simultaneously in one stamping, which is beneficial to improving the production efficiency of bipolar plates. Similarly, for the processing of the second recess 222 and the second protrusion 121, the second recess 222 can also be stamped out on the plate surface where the second cathode distribution area 22 is located, so that the plate surface where the second anode distribution area 12 is located is correspondingly arched, thus obtaining the second protrusion 121; for the processing of the third recess 112 and the third protrusion 211, the third recess 112 can also be stamped out on the plate surface where the first anode distribution area 11 is located, so that the plate surface where the first cathode distribution area 21 is located is correspondingly arched, thus obtaining the third protrusion 211; for the processing of the fourth recess 122 and the fourth protrusion 221, the fourth recess 122 can also be stamped out on the plate surface where the second anode distribution area 12 is located, so that the plate surface where the second cathode distribution area 22 is located is correspondingly arched, thus obtaining the fourth protrusion 221.

[0064] In this optional embodiment, by forming a recess in the distribution area at a position opposite to the protrusion, the thickness of the portion of the bipolar plate where the protrusion is located can be reduced, thereby reducing the weight and material cost of the bipolar plate.

[0065] Optionally, such as Figure 1 and Figure 14 As shown, the anode surface 1 further includes an anode reaction zone 13 located between the first anode distribution zone 11 and the second anode distribution zone 12, and the anode reaction zone 13 is provided with a plurality of first flow channel grooves 131; as Figure 6 and Figure 16 As shown, the cathode surface 2 also includes a cathode reaction region 23 located between the first cathode distribution region 21 and the second cathode distribution region 22, and the cathode reaction region 23 is provided with a plurality of second flow channel grooves 231.

[0066] The first flow channel groove 131 can be formed by extending along the direction from the first anode distribution region 11 to the second anode distribution region 12, and the second flow channel groove 231 can be formed by extending along the direction from the first cathode distribution region 21 to the second cathode distribution region 22. It should be noted that the specific shape of the first flow channel groove 131 and the second flow channel groove 231 is not limited. For example, it can be a wavy flow channel, a parallel flow channel, or a serpentine flow channel. Specifically, in this embodiment, the first flow channel groove 131 and the second flow channel groove 231 are wavy flow channels.

[0067] In this optional embodiment, the design of multiple first flow channel grooves 131 and multiple second flow channel grooves 231 is conducive to the uniform distribution of gas and liquid on the bipolar plate and improves electrolysis efficiency.

[0068] Optionally, the projections of the plurality of first flow channel grooves 131 onto the bipolar plate and the projections of the plurality of second flow channel grooves 231 onto the bipolar plate are arranged alternately.

[0069] It should be noted that the projections of the plurality of first flow channel grooves 131 onto the bipolar plate and the projections of the plurality of second flow channel grooves 231 onto the bipolar plate are arranged alternately. This means that the projections of the plurality of first flow channel grooves 131 onto the bipolar plate and the projections of the plurality of second flow channel grooves 231 onto the bipolar plate do not overlap, and for any projection of a first flow channel groove 131, the projection of a second flow channel groove 231 is adjacent to it. Specifically, refer to... Figure 14 Multiple first flow channel grooves 131 are arranged on the anode surface 1 along the width direction of the bipolar plate, and the second flow channel groove 231 is located on the cathode surface 1 opposite to the middle area of ​​the two adjacent first flow channel grooves 131.

[0070] In this optional embodiment, the projections of multiple first flow channel grooves 131 onto the bipolar plate and the projections of multiple second flow channel grooves 231 onto the bipolar plate are arranged alternately, thereby causing the first flow channel grooves 131 and the second flow channel grooves 231 to be misaligned with each other in terms of bipolar plate thickness. Compared with the first flow channel grooves 131 and the second flow channel grooves 231 overlapping, this solution is beneficial to ensure the thickness of the bipolar plate, so as to avoid the bipolar plate being too thin and affecting the structural strength.

[0071] Optionally, such as Figure 16 As shown, a first flow channel ridge 232 is provided on the cathode reaction region 23 at a position opposite to the first flow channel groove 131; and / or, as shown Figure 14 As shown, a second flow channel ridge 132 is provided on the anode reaction zone 13 at a position opposite to the second flow channel groove 231.

[0072] In this optional embodiment, the first flow channel ridge 232 and the second flow channel ridge 132 can also overlap each other when the two bipolar plates are stacked, so as to support each other and further improve the support strength of the bipolar plates. Furthermore, since the flow channel ridge is located opposite to the flow channel groove, the presence of the flow channel ridge will not excessively increase the thickness of the part of the bipolar plate in which it is located, which is beneficial to ensure a lighter weight and lower material cost of the bipolar plates.

[0073] Optionally, the distance between the centerlines of two adjacent first flow channel grooves 131 is between 3 mm and 5 mm, the distance between the centerlines of two adjacent second flow channel grooves 231 is between 3 mm and 5 mm, the width of the first flow channel groove 131 is between 1 mm and 3 mm, the width of the second flow channel groove 231 is between 1 mm and 3 mm, the width of the first flow channel ridge 232 is between 1 mm and 4 mm, and the width of the second flow channel ridge 132 is between 1 mm and 4 mm. This configuration results in narrower flow channels, which helps promote longitudinal diffusion of gas and liquid, thereby improving the polarization performance of the electrolyzer and reducing hydrogen production energy consumption.

[0074] Optionally, the thickness of the bipolar plate is between 0.2 mm and 0.4 mm. The thickness of the bipolar plate refers to the original thickness of the sheet material before stamping. By limiting the thickness of the bipolar plate to between 0.2 mm and 0.4 mm, the bipolar plate is made thinner, which helps to reduce weight and material costs.

[0075] It should be noted that, as Figure 1 As shown, the bipolar plate can also be equipped with a reaction water inlet 3, a reaction water and oxygen outlet 4, and a hydrogen outlet 5, to serve as a gas-liquid flow channel.

[0076] Optionally, such as Figure 1 As shown, the bipolar plate is provided with two positioning holes 6, which are located near the two ends of the diagonal of the bipolar plate to ensure the precise positioning of the bipolar plate during assembly.

[0077] Optionally, such as Figure 1 As shown, the bipolar plate is provided with two inspection interfaces 7. The two inspection interfaces 7 are respectively located near the two ends of the diagonal of the bipolar plate, and the two inspection interfaces 7 are located on the same side of the diagonal. In this way, when the two bipolar plates are stacked, the two inspection interfaces 7 belonging to the two bipolar plates are staggered (see details). Figure 13 This is to facilitate subsequent power connection checks on the two inspection interfaces 7.

[0078] Optionally, such as Figure 14 and Figure 15 As shown, the anode reaction zone 13 has a first anode side and a second anode side. The first anode side is provided with a first convex surface 133, and the second anode side is provided with a second convex surface 134, as shown. Figure 16 and Figure 17 As shown, the cathode reaction region 23 has a first cathode side opposite to the first anode side and a second cathode side opposite to the second anode side in the thickness direction of the bipolar plate. The first cathode side is provided with a third convex surface 233, and the second cathode side is provided with a fourth convex surface 234. When two bipolar plates are stacked, the first convex surface 133 of one bipolar plate overlaps with the fourth convex surface 234 of the other bipolar plate (see reference). Figure 18 The second convex surface 134 of one of the bipolar plates overlaps with the third convex surface 233 of the other bipolar plate (see reference). Figure 19 ).

[0079] The first anode side may be provided with a first arch, the end face of which is the first convex surface 133; the second anode side may be provided with a second arch, the end face of which is the second convex surface 134; the first cathode side may be provided with a third arch, the end face of which is the third convex surface 233; and the second cathode side may be provided with a fourth arch, the end face of which is the fourth convex surface 234.

[0080] In this optional embodiment, the first convex surface 133 overlaps with the fourth convex surface 234 when the two bipolar plates are stacked, and the second convex surface 134 overlaps with the third convex surface 233 when the two bipolar plates are stacked, which increases the number of support points between the two bipolar plates and helps to further improve the support strength of the two bipolar plates after stacking.

[0081] Optionally, such as Figure 16 As shown, a first concave surface 235 is provided on the first cathode side at a position opposite to the first convex surface 133; and / or, as shown Figure 17 As shown, a second concave surface 236 is provided on the second cathode side at a position opposite to the second convex surface 134; and / or, as shown Figure 14 As shown, a third concave surface 135 is provided on the first anode side at a position opposite to the third convex surface 233; and / or, as shown Figure 15 As shown, a fourth concave surface 136 is provided on the second anode side at a position opposite to the fourth convex surface 234.

[0082] It should be noted that, regarding the processing method of the first concave surface 235 and the first convex surface 133, the first concave surface 235 can be stamped out on the plate surface where the first cathode side is located, so that the plate surface where the first anode side is located is correspondingly arched, thus obtaining the first convex surface 133. In this way, the first concave surface 235 and the first convex surface 133 can be obtained simultaneously in one stamping, which is beneficial to improving the production efficiency of bipolar plates. Similarly, for the processing of the second concave surface 236 and the second convex surface 134, the second concave surface 236 can also be stamped out on the plate surface where the second cathode side is located, so that the plate surface where the second anode side is located is correspondingly arched, thus obtaining the second convex surface 134; for the processing of the third concave surface 135 and the third convex surface 233, the third concave surface 135 can also be stamped out on the plate surface where the first anode side is located, so that the plate surface where the first cathode side is located is correspondingly arched, thus obtaining the third convex surface 233; for the processing of the fourth concave surface 136 and the fourth convex surface 234, the fourth concave surface 136 can also be stamped out on the plate surface where the second anode side is located, so that the plate surface where the second cathode side is located is correspondingly arched, thus obtaining the fourth convex surface 234.

[0083] It should also be noted that the first convex surface 133 can be elongated, and its length is equivalent to the length of the reaction zone. Correspondingly, the first concave surface 235 is also elongated, and its length is equivalent to the length of the reaction zone. The second convex surface 134 can be triangular, and multiple such surfaces can be provided. Correspondingly, the second concave surface 236 is also triangular, and multiple such surfaces can be provided. The third convex surface 233 can be triangular, and multiple such surfaces can be provided. Correspondingly, the third concave surface 135 is also triangular, and multiple such surfaces can be provided. The fourth convex surface 234 can be elongated, and its length is equivalent to the length of the reaction zone. Correspondingly, the fourth concave surface 136 is also elongated, and its length is equivalent to the length of the reaction zone.

[0084] In this optional embodiment, by providing a concave surface at a position opposite to the convex surface on the anode or cathode side of the reaction zone, the thickness of the bipolar plate portion where the convex surface is located can be reduced, thereby reducing the weight and material cost of the bipolar plate.

[0085] Optionally, such as Figure 2 and Figure 3 As shown, the first anode distribution area 11 is provided with a plurality of first protrusions 113 arranged sequentially and spaced apart along its edge, such as... Figure 4 and Figure 5 As shown, the second anode distribution area 12 is provided with a plurality of second protrusions 123 arranged sequentially at intervals along its edge, such as... Figure 7 and Figure 8 As shown, the first cathode distribution area 21 is provided with a plurality of third protrusions 213 arranged sequentially at intervals along its edge, such as... Figure 9 and Figure 10 As shown, the second cathode distribution area 22 is provided with a plurality of fourth protrusions 223 arranged sequentially at intervals along its edge. When the two bipolar plates are stacked, the plurality of first protrusions 113 overlap with the plurality of fourth protrusions 223 (see reference). Figure 20 and Figure 21 The plurality of second protrusions 123 overlap with the plurality of third protrusions 213.

[0086] It should be noted that the protrusions can be arranged in one or more rings along the edge of the distribution area as needed, and the specific number of rings is not limited here. It should also be noted that the projections of the multiple first protrusions 113 onto the bipolar plate and the projections of the multiple third protrusions 213 onto the bipolar plate can be arranged alternately to avoid excessive thickness in some areas of the bipolar plate. Similarly, the projections of the multiple second protrusions 123 onto the bipolar plate and the projections of the multiple fourth protrusions 223 onto the bipolar plate can also be arranged alternately to avoid excessive thickness in some areas of the bipolar plate.

[0087] In this optional embodiment, by setting multiple protrusions spaced apart at the edge of the distribution area, not only can the uniformity of gas-liquid distribution be improved, but the protrusions can also overlap with other corresponding protrusions when the two bipolar plates are stacked, so as to further improve the support strength.

[0088] Optionally, such as Figure 7 and Figure 8 As shown, the first cathode distribution region 21 is recessed to form a first groove 214, so that the first protrusion 113 is formed in the first anode distribution region 11 corresponding to the first groove 214; and / or, as Figure 9 and Figure 10 As shown, the second cathode distribution region 22 is recessed to form a second groove 224, so that the second protrusion 123 is formed in the second anode distribution region 12 corresponding to the second groove 224; and / or, as Figure 2 and Figure 3 As shown, the first anode distribution region 11 is recessed to form a third groove 114, so that the third protrusion 213 is formed in the first cathode distribution region 21 corresponding to the third groove 114; and / or, as Figure 4 and Figure 5 As shown, the second anode distribution area 12 is recessed to form a fourth groove 124, so that the fourth protrusion 223 is formed in the second cathode distribution area 22 corresponding to the fourth groove 124.

[0089] It should be noted that, regarding the processing method of the first groove 214 and the first protrusion 113, the first groove 214 can be stamped out on the plate surface where the first cathode distribution area 21 is located, so that the plate surface where the first anode distribution area 11 is located is correspondingly arched, thus obtaining the first protrusion 113. In this way, the first groove 214 and the first protrusion 113 can be obtained simultaneously in one stamping, which is beneficial to improving the production efficiency of bipolar plates. Similarly, for the processing of the second groove 224 and the second protrusion 123, the second groove 224 can also be stamped out on the plate surface where the second cathode distribution area 22 is located, so that the plate surface where the second anode distribution area 12 is located is correspondingly arched, thus obtaining the second protrusion 123; for the processing of the third groove 114 and the third protrusion 213, the third groove 114 can also be stamped out on the plate surface where the first anode distribution area 11 is located, so that the plate surface where the first cathode distribution area 21 is located is correspondingly arched, thus obtaining the third protrusion 213; for the processing of the fourth groove 124 and the fourth protrusion 223, the fourth groove 124 can also be stamped out on the plate surface where the second anode distribution area 12 is located, so that the plate surface where the second cathode distribution area 22 is located is correspondingly arched, thus obtaining the fourth protrusion 223.

[0090] In this optional embodiment, by forming a groove in the distribution area to obtain a corresponding protrusion, the thickness of the bipolar plate portion where the protrusion is located can be reduced, which is beneficial to reducing the weight and material cost of the bipolar plate.

[0091] like Figure 22 and Figure 23 As shown in the figure, an electrolytic cell provided by this utility model includes the bipolar plate 84 as described above.

[0092] Specifically, the electrolytic cell may also include a base 81, an end plate 82, an insulating plate 83, a screw 85, a disc spring 86, a nut 87, and a current collector 88. One end plate 82 is located on the upper end of the base 81, and another end plate 82 is located above the first end plate 82. Multiple bipolar plates 84 are stacked sequentially between the two end plates 82. An insulating plate 83 is located between the bipolar plates 84 and the end plates 82 to isolate the bipolar plates 84 and the end plates 82. The screw 85 passes through both end plates 82. The disc spring 86 and the nut 87 are installed at the end of the screw 85 to provide clamping force, thereby pressing the bipolar plates 84 and the insulating plate 83 between the two end plates 82. Two current collectors 88 are respectively installed at both ends of the multiple bipolar plates 84 to collect and conduct current.

[0093] In this embodiment, since the electrolytic cell includes the bipolar plate described above, it has all the beneficial effects of all the embodiments of the bipolar plate described above, which will not be repeated here.

[0094] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A bipolar plate, characterized in that, The bipolar plate has an anode surface (1) and a cathode surface (2). The anode surface (1) includes a first anode distribution area (11) and a second anode distribution area (12). The first anode distribution area (11) has a first protrusion (111), and the second anode distribution area (12) has a second protrusion (121). The cathode surface (2) includes a first cathode distribution area (21) opposite to the first anode distribution area (11) and a second cathode distribution area (22) opposite to the second anode distribution area (12) in the thickness direction of the bipolar plate. The first cathode distribution area (21) has a third protrusion (211), and the second cathode distribution area (22) has a fourth protrusion (221). When two bipolar plates are stacked, the first protrusion (111) of one bipolar plate overlaps with the fourth protrusion (221) of the other bipolar plate, and the second protrusion (121) of one bipolar plate overlaps with the third protrusion (211) of the other bipolar plate.

2. The bipolar plate according to claim 1, characterized in that, A first recess (212) is formed in the first cathode distribution area (21) at a position opposite to the first protrusion (111); and / or, A second recess (222) is formed on the second cathode distribution area (22) at a position opposite to the second protrusion (121); and / or, A third recess (112) is formed on the first anode distribution area (11) at a position opposite to the third protrusion (211); and / or, A fourth recess (122) is formed on the second anode distribution area (12) at a position opposite to the fourth protrusion (221).

3. The bipolar plate according to claim 1, characterized in that, The anode surface (1) further includes an anode reaction zone (13) located between the first anode distribution zone (11) and the second anode distribution zone (12), and the anode reaction zone (13) is provided with a plurality of first flow channel grooves (131); The cathode surface (2) further includes a cathode reaction zone (23) located between the first cathode distribution zone (21) and the second cathode distribution zone (22), and the cathode reaction zone (23) is provided with a plurality of second flow channel grooves (231).

4. The bipolar plate according to claim 3, characterized in that, The projections of the first flow channel grooves (131) on the bipolar plate and the projections of the second flow channel grooves (231) on the bipolar plate are arranged alternately.

5. The bipolar plate according to claim 4, characterized in that, A first flow channel ridge (232) is provided on the cathode reaction zone (23) at a position opposite to the first flow channel groove (131); and / or, The anode reaction zone (13) is provided with a second flow channel ridge (132) at a position opposite to the second flow channel groove (231).

6. The bipolar plate according to claim 3, characterized in that, The anode reaction region (13) has a first anode side and a second anode side. The first anode side has a first convex surface (133), and the second anode side has a second convex surface (134). The cathode reaction region (23) has a first cathode side opposite to the first anode side and a second cathode side opposite to the second anode side in the thickness direction of the bipolar plate. The first cathode side has a third convex surface (233), and the second cathode side has a fourth convex surface (234). When two bipolar plates are stacked, the first convex surface (133) of one bipolar plate overlaps with the fourth convex surface (234) of the other bipolar plate, and the second convex surface (134) of one bipolar plate overlaps with the third convex surface (233) of the other bipolar plate.

7. The bipolar plate according to claim 6, characterized in that, A first concave surface (235) is provided on the first cathode side at a position opposite to the first convex surface (133); and / or, A second concave surface (236) is provided on the second cathode side at a position opposite to the second convex surface (134); and / or, A third concave surface (135) is provided on the first anode side at a position opposite to the third convex surface (233); and / or, A fourth concave surface (136) is provided on the second anode side at a position opposite to the fourth convex surface (234).

8. The bipolar plate according to claim 1, characterized in that, The first anode distribution area (11) is provided with a plurality of first protrusions (113) arranged sequentially at intervals along its edge, the second anode distribution area (12) is provided with a plurality of second protrusions (123) arranged sequentially at intervals along its edge, the first cathode distribution area (21) is provided with a plurality of third protrusions (213) arranged sequentially at intervals along its edge, and the second cathode distribution area (22) is provided with a plurality of fourth protrusions (223) arranged sequentially at intervals along its edge. When the two bipolar plates are stacked, the plurality of first protrusions (113) and the plurality of fourth protrusions (223) overlap correspondingly, and the plurality of second protrusions (123) and the plurality of third protrusions (213) overlap correspondingly.

9. The bipolar plate according to claim 8, characterized in that, The first cathode distribution region (21) is recessed to form a first groove (214), so that the first protrusion (113) is formed in the first anode distribution region (11) corresponding to the first groove (214); and / or, The second cathode distribution region (22) is recessed to form a second groove (224), so that the second protrusion (123) is formed in the second anode distribution region (12) corresponding to the second groove (224); and / or, The first anode distribution area (11) is recessed to form a third groove (114), so that the third protrusion (213) is formed in the first cathode distribution area (21) corresponding to the third groove (114); and / or, The second anode distribution area (12) is recessed to form a fourth groove (124) so ​​that the fourth protrusion (223) is formed in the second cathode distribution area (22) corresponding to the fourth groove (124).

10. An electrolytic cell, characterized in that, Includes the bipolar plate as described in any one of claims 1 to 9.

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