Bipolar plate and fuel cell

Abstract

This invention discloses a bipolar plate and a fuel cell, belonging to the field of fuel cell technology. In this invention, both the first and second distribution blocks can guide and distribute the fluid, improving not only the uniformity of fluid distribution but also facilitating control of the fluid flow direction and enhancing the guiding capacity. Even for large-sized bipolar plates, it ensures that the fluid can be evenly distributed to the active zone flow channel far from the inlet. Compared to existing technologies, this not only solves the problem of uneven fluid distribution in the active zone flow channel far from the inlet of large-sized bipolar plates, improving fuel cell performance, but also effectively avoids misalignment of the distribution channels, improving the stack assembly efficiency.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and more particularly to bipolar plates and fuel cells. Background Technology

[0002] Metal plates possess excellent stability, high conductivity, and ease of processing, making them a primary material for fuel cell bipolar plates suitable for mass production. For metal plates, welding is commonly used to connect the cathode and anode plates, forming the bipolar plate structure.

[0003] Existing metal bipolar plates, due to structural issues with the plates themselves, can affect the stability and uniformity of airflow distribution during the molding process.

[0004] Among them, the air inlet and outlet are key positions on the electrode plate, affecting the overall air intake and exhaust volume, as well as the stability of the air intake and exhaust. Taking the air inlet as an example, if... Figure 1 and Figure 2 As shown, after the cathode and anode plates are welded together, a weld seam 1' is formed at the air inlet. A process slit 2' exists before weld seam 1'. When the airflow passes through the air inlet, some of the airflow enters slit 2' and then returns to the air inlet, causing airflow disturbance and affecting the consistency of air intake and exhaust. This phenomenon is widespread and cannot be effectively resolved by changing operating conditions.

[0005] Furthermore, cylindrical lattice structures or guide channels are typically designed in the distribution area of ​​the bipolar plate to distribute the inlet fluid evenly throughout the active zone. For large-sized bipolar plates, the cylindrical lattice in the distribution area cannot evenly distribute the inlet fluid to the active zone channels far from the inlet. Although porous fiber materials can be used to improve fluid distribution uniformity, their guiding properties are uncontrollable and unadjustable. Misalignment during bipolar plate welding can also cause the guide channels in the distribution area to malfunction, leading to a decline in bipolar plate performance. Summary of the Invention

[0006] The purpose of this invention is to provide a bipolar plate and a fuel cell that improves the uniformity of fluid distribution, thereby improving the performance of the fuel cell.

[0007] To achieve the above objectives, the following technical solution is provided:

[0008] On the one hand, a bipolar plate is provided, including two fixedly connected monopolar plates. The monopolar plate includes a common flow channel opening region, an active region, and a distribution region located between the common flow channel opening region and the active region. The active region is provided with a plurality of active region flow channels extending along a first direction.

[0009] The feature is that the distribution area is provided with a distribution structure, the distribution structure includes multiple distribution units, the multiple distribution units are stacked, each distribution unit includes multiple distribution components arranged in an array, each distribution component includes a first distribution block and a second distribution block, the second distribution block is located above the first distribution block, one end of the second distribution block is connected to one end of the first distribution block to form a V-shaped structure, the first distribution block has a first included angle with the first direction, and the second distribution block has a second included angle with the first direction; along the longitudinal direction of the array, one end of the second distribution block of one of two adjacent distribution components is fixedly connected to the first distribution block of the other; along the transverse direction of the array, one end of the second distribution block of one of two adjacent distribution components is fixedly connected to one end of the first distribution block of the other.

[0010] As an alternative to the bipolar plate, one of the distribution area and the distribution structure is provided with multiple protrusions, and the other is provided with multiple grooves, with the multiple protrusions and multiple grooves being inserted into each other in a one-to-one correspondence.

[0011] As an alternative to the bipolar plate, the width k1 of the first distribution block is 50μm-250μm; and / or,

[0012] The width k2 of the second allocation block is 50μm-250μm.

[0013] As an alternative to the bipolar plate, the angle of the first included angle is 0°-85°; and / or,

[0014] The angle of the second included angle is 0°-85°.

[0015] As an alternative to the bipolar plate, along the longitudinal direction of the array, the spacing m between two adjacent first distribution blocks is 50μm-400μm; and / or,

[0016] Along the transverse direction of the array, the spacing n between two adjacent second allocation blocks is 50μm-400μm.

[0017] As an alternative to the bipolar plate, the angle θ between the second distribution block and the first distribution block in the V-shaped structure is 20°-60°.

[0018] As an alternative to the bipolar plate, the distribution area is provided with a distribution groove, and the distribution structure is disposed in the distribution groove.

[0019] As an alternative to the bipolar plate, the thickness of the distribution structure is equal to the depth of the distribution groove along a direction perpendicular to the monopolar plate.

[0020] As an optional solution for the bipolar plate, the common flow channel area includes multiple air inlets and outlets. A connecting structure is provided on the outside of the air inlets and outlets. Two single plates are fixedly connected through the connecting structure. A slit is formed between the two single plates. The slit is located between the air inlets and outlets and the connecting structure.

[0021] A blocking structure is provided between the two monoplates, which can prevent fluid passing through the inlet and outlet from entering the slit.

[0022] On the other hand, a fuel cell is provided, comprising a plurality of bipolar plates as described above, wherein the plurality of bipolar plates are stacked.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] The bipolar plate and fuel cell of the present invention, in which both the first distribution block and the second distribution block can guide and distribute the fluid, not only improve the uniformity of fluid distribution, but also facilitate the control of fluid flow direction and improve the guiding capacity. Even for large-sized bipolar plates, it can ensure that the fluid can be evenly distributed to the active zone flow channel far from the inlet. Compared with the prior art, it not only solves the problem of uneven fluid distribution in the active zone flow channel far from the inlet of large-sized bipolar plates and improves the performance of fuel cells, but also effectively avoids misalignment of the distribution channel and improves the stack assembly efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a monopolar plate in the prior art;

[0026] Figure 2 for Figure 1 A cross-sectional view of the AA plane;

[0027] Figure 3 This is a schematic diagram showing the assembly relationship between the distribution structure and the bipolar plate in an embodiment of the present invention;

[0028] Figure 4 for Figure 3 A cross-sectional view of the BB plane;

[0029] Figure 5 This is a schematic diagram of the distribution unit in an embodiment of the present invention;

[0030] Figure 6 This is a top view of the allocation unit in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the allocation structure in an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram illustrating the relationship between the allocation structure and the allocation area in an embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of the limiting structure of the distribution area in an embodiment of the present invention;

[0034] Figure 10 for Figure 9 A cross-sectional view of the C-plane;

[0035] Figure 11 This is a schematic diagram of the blocking structure in an embodiment of the present invention.

[0036] Figure label:

[0037] 1. Weld; 2. Slit;

[0038] α1, the first included angle; α2, the second included angle;

[0039] 1. Single plate; 101. Cathode plate; 102. Anode plate; 11. Common flow channel area; 111. Inlet and outlet; 112. Connecting structure; 113. Slit; 12. Active area; 13. Distribution area; 131. Limiting structure; 14. Blocking structure;

[0040] 2. Allocation structure; 21. Allocation unit; 211. Allocation component; 2111. First allocation block; 2112. Second allocation block. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element 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 the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0048] like Figure 3-11 As shown, this embodiment provides a bipolar plate, including two fixedly connected monopolar plates 1. The monopolar plate 1 includes a common flow channel opening region 11, an active region 12, and a distribution region 13 located between the common flow channel opening region 11 and the active region 12. The active region 12 is provided with a plurality of active region flow channels extending along a first direction; the distribution region 13 is provided with a distribution structure 2.

[0049] The distribution structure 2 includes multiple distribution units 21, which are stacked together. Each distribution unit 21 includes multiple distribution components 211 arranged in an array. Each distribution component 211 includes a first distribution block 2111 and a second distribution block 2112. The second distribution block 2112 is located above the first distribution block 2111, and one end of the second distribution block 2112 is connected to one end of the first distribution block 2111 to form a V-shaped structure. The first distribution block 2111 and the first direction are provided with a first angle α1, and the second distribution block 2112 and the first direction are provided with a second angle α2. Along the longitudinal direction of the array, one end of the second distribution block 2112 of one of two adjacent distribution components 211 is fixedly connected to the first distribution block 2111 of the other. Along the transverse direction of the array, one end of the second distribution block 2112 of one of two adjacent distribution components is fixedly connected to one end of the first distribution block 2111 of the other. In other words, the multiple first distribution blocks 2111 and second distribution blocks 2112 are arranged in an array and stacked to form an integral porous structure, which uniformly distributes the fluid in the distribution area 13. The array's horizontal direction is parallel to the first direction and perpendicular to the vertical direction, while the array's vertical direction is perpendicular to both the horizontal and vertical directions.

[0050] Both the first distribution block 2111 and the second distribution block 2112 can guide and distribute the fluid, which not only improves the uniformity of fluid distribution, but also facilitates the control of fluid flow direction and improves the guiding capacity. Even for large-sized bipolar plates, it can ensure that the fluid can be evenly distributed to the active area flow channel far from the inlet. Compared with the existing technology, it not only solves the problem of uneven fluid distribution in the active area flow channel far from the inlet of large-sized bipolar plates and improves fuel cell performance, but also effectively avoids misalignment of the distribution channel and improves the stack assembly efficiency.

[0051] The distribution structure of this embodiment is universal and can be used for all plates that have similar problems.

[0052] Optionally, the distribution area 13 is provided with a distribution groove, and the distribution structure 2 is disposed within the distribution groove. By replacing the cylindrical dot matrix and guide channel in the prior art with the distribution structure 2, it is easier to match with existing bipolar plates.

[0053] It is understood that one of the two monopolar plates 1 is an anode plate 102 and the other is a cathode plate 101. The first surface of the anode plate 102 is provided with an anode gas distribution area and the second surface of the anode plate 102 is provided with an anode cooling distribution area. The first surface of the cathode plate 101 is provided with a cathode gas distribution area and the second surface of the cathode plate 101 is provided with a cathode cooling distribution area. After the second surface of the anode plate 102 and the second surface of the cathode plate 101 are fixedly connected to form a bipolar plate, the anode cooling distribution area and the cathode cooling distribution area are arranged opposite each other to form a cooling distribution area.

[0054] It should be noted that at least one of the anode gas distribution area, cathode gas distribution area, and cooling distribution area is provided with a distribution structure 2. In this embodiment, the anode gas distribution area, cathode gas distribution area, and cooling distribution area are all provided with a distribution structure 2 to achieve uniform distribution of anode gas, cathode gas, and coolant in the active area 12. Specifically, the anode gas distribution area is provided with an anode gas distribution groove, and the corresponding distribution structure 2 is provided in the anode gas distribution groove; the cathode gas distribution area is provided with a cathode gas distribution groove, and the corresponding distribution structure 2 is provided in the cathode gas distribution groove; the anode cooling distribution area is provided with an anode cooling distribution groove, and the corresponding cathode cooling distribution area is provided with a cathode cooling distribution groove. After the second surface of the anode plate 102 and the second surface of the cathode plate 101 are fixedly connected to form a bipolar plate, the anode cooling distribution groove and the cathode cooling distribution groove are arranged opposite each other to form a total cooling distribution groove, and the corresponding distribution structure 2 is provided in the total cooling distribution groove. In other words, only one distribution structure 2 needs to be provided in the total cooling distribution groove, which facilitates assembly.

[0055] Of course, in other embodiments, the distribution structure may be provided only in the anode gas distribution area, the cathode gas distribution area, or the cooling distribution area, or the distribution structure may be provided in any two of the anode gas distribution area, the cathode gas distribution area, and the cooling distribution area. The specific choice can be made flexibly according to the needs, and no limitation is made here.

[0056] Furthermore, the shape of the allocation structure 2 can be flexibly set according to the shape of the allocation area 13, resulting in a higher degree of matching.

[0057] In this embodiment, the distribution area 13 is provided with multiple protrusions 131, and the distribution structure 2 is provided with multiple grooves. The multiple protrusions 131 are inserted into the multiple grooves in a one-to-one correspondence to position the distribution structure 2. Of course, in other embodiments, it can also be set as follows: the distribution structure 2 is provided with multiple protrusions 131, the distribution area 13 is provided with multiple grooves, and the multiple protrusions 131 are inserted into the multiple grooves in a one-to-one correspondence.

[0058] In this embodiment, the first dispensing block 2111 is made of metal, and its outer surface is coated with a corrosion-resistant coating. The second dispensing block 2112 is made of metal, and its outer surface is coated with a corrosion-resistant coating. In other embodiments, the first dispensing block 2111 and the second dispensing block 2112 may also be made of non-metallic materials.

[0059] It should be noted that the height direction of the first distribution block 2111 is perpendicular to the monopolar plate 1, and the height direction, width direction, and length direction of the first distribution block 2111 are all perpendicular to each other. Optionally, the height h1 of the first distribution block 2111 is greater than the width k1 of the first distribution block 2111. In other words, the first distribution block 2111 is a plate-like structure set perpendicular to the monopolar plate 1, which facilitates guiding the fluid to flow along the length direction of the first distribution block 2111, resulting in better flow guidance.

[0060] The height of the second distribution block 2112 is perpendicular to the monopolar plate 1, and the height, width, and length of the second distribution block 2112 are all perpendicular to each other. Optionally, the height h2 of the second distribution block 2112 is greater than its width k2. In other words, the second distribution block 2112 is a plate-like structure perpendicular to the monopolar plate 1, which facilitates guiding the fluid to flow along its length, resulting in better flow guidance.

[0061] If the width k1 of the first distribution block 2111 is too large, the fluid flow resistance will increase sharply, affecting the performance of the fuel cell stack. If the width k1 of the first distribution block 2111 is too small, it will result in poor manufacturability, high processing difficulty, and high cost. Optionally, the width k1 of the first distribution block 2111 is 50μm-250μm, which can balance fuel cell stack performance and cost while ensuring uniform fluid distribution.

[0062] For example, the width k1 of the first allocation block 2111 can be any value between 50μm and 250μm, such as 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm, 210μm, 220μm, 230μm, 240μm, 250μm, etc.

[0063] If the width k2 of the second distribution block 2112 is too large, it will increase the fluid flow resistance and affect the performance of the fuel cell stack. If the width k2 of the second distribution block 2112 is too small, it will result in poor manufacturability, high processing difficulty, and high cost. Optionally, the width k2 of the second distribution block 2112 is 50μm-250μm, which can balance fuel cell stack performance and cost while ensuring uniform fluid distribution.

[0064] For example, the width k2 of the second allocation block 2112 can be any value between 50μm and 250μm, such as 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm, 210μm, 220μm, 230μm, 240μm, 250μm, etc.

[0065] Optionally, the first included angle α1 is 0°-85°. By changing the first included angle α1, the flow guiding capacity of the first distribution block 2111 can be changed, thereby changing the distribution uniformity of the distribution structure 2. The second included angle α2 is 0°-85°. By changing the second included angle α2, the flow guiding capacity of the second distribution block 2112 can be changed, thereby changing the distribution uniformity of the distribution structure 2. With this setting, the distribution structure 2 can be matched with monopole plates 1 of different sizes to achieve different guiding effects.

[0066] For example, the angle of the first included angle α1 can be any value between 0° and 85°, such as 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, etc. The angle of the second included angle α2 can be any value between 0° and 85°, such as 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, etc.

[0067] If the distance *m* between two adjacent first distribution blocks 2111 is too large, the distribution structure 2 will lose its guiding function in the large-sized monopolar plate 1, resulting in the inability to distribute fluid to the active zone flow channel far from the inlet; conversely, if the distance *m* between two adjacent first distribution blocks 2111 is too small, the fluid pressure drop will increase. Optionally, along the longitudinal direction of the array, the distance *m* between two adjacent first distribution blocks 2111 is 50μm-400μm; this balances the guiding capability of the first distribution block 2111 and the fluid pressure drop, enabling the first distribution block 2111 to more effectively distribute fluid to the active zone flow channel far from the inlet, which is beneficial to improving the distribution uniformity of the distribution structure 2.

[0068] For example, the spacing m between two adjacent first allocation blocks 2111 can be any value between 50μm and 400μm, such as 50μm, 100μm, 150μm, 200μm, 150μm, 300μm, 350μm, 400μm, etc.

[0069] If the spacing n between two adjacent second distribution blocks 2112 is too large, the distribution structure 2 will lose its guiding function in the large-sized monopolar plate 1, resulting in the inability to distribute fluid to the active zone flow channel far from the inlet; conversely, if the spacing n between two adjacent second distribution blocks 2112 is too small, the fluid pressure drop will increase. Optionally, along the transverse direction of the array, the spacing n between two adjacent second distribution blocks 2112 is 50μm-400μm; this balances the guiding capability of the second distribution block 2112 and the fluid pressure drop, enabling the second distribution block 2112 to more effectively distribute fluid to the active zone flow channel far from the inlet, which is beneficial to improving the distribution uniformity of the distribution structure 2.

[0070] For example, the spacing n between two adjacent second allocation blocks 2112 can be any value between 50μm and 400μm, such as 50μm, 100μm, 150μm, 200μm, 150μm, 300μm, 350μm, 400μm, etc.

[0071] Optionally, the angle θ between the second distribution block 2112 and the first distribution block 2111 of the V-shaped structure is 20°-60°. On the one hand, this ensures that the second distribution block 2112 can fully utilize its guiding capability to match single plates 1 of different sizes. On the other hand, it ensures that along the longitudinal direction of the array, one end of the second distribution block 2112 of one of the two adjacent distribution components 211 is fixedly connected to the first distribution block 2111 of the other. Along the transverse direction of the array, one end of the second distribution block 2112 of one of the two adjacent distribution components 211 is fixedly connected to the first distribution block 2111 of the other, so that multiple distribution units 21 are fixedly connected to form a whole.

[0072] For example, the angle θ between the second distribution block 2112 and the first distribution block 2111 of the V-shaped structure can be any value between 20° and 60°, such as 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0073] Optionally, along the direction perpendicular to the monopole plate 1, the thickness of the distribution structure 2 is equal to the depth of the distribution groove. In other words, the thickness of the distribution structure 2 matches the depth of the distribution groove, thus not affecting the fixed connection of the two monopole plates 1 or the setting of other structures in the fuel cell stack. Optionally, along the direction perpendicular to the monopole plate 1, the thickness of the distribution structure 2 is 0.25mm-0.5mm, which can match the commonly used monopole plates 1 on the market and can maintain the same height as the ridge of the monopole plate 1 without changing the structure of the monopole plate 1, thus not excessively increasing the cost.

[0074] For example, the thickness of the distribution structure 2 can be any value between 0.25mm and 0.5mm, such as 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.30mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.40mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.5mm, etc.

[0075] It is understood that the common flow channel area 11 includes multiple air inlets and outlets 111. For example, the multiple air inlets and outlets 111 include an anode gas inlet, an anode gas outlet, a cathode gas inlet, and a cathode gas outlet. The arrangement and location of the anode gas inlet, anode gas outlet, cathode gas inlet, and cathode gas outlet are existing technologies and will not be described in detail here.

[0076] Optionally, a connecting structure 112 is provided on the outer side of the inlet / outlet 111. Two monopole plates 1 are fixedly connected by the connecting structure 112, and a slit 113 is formed between the two monopole plates 1. The slit 113 is located between the inlet / outlet 111 and the connecting structure 112. Exemplarily, the connecting structure 112 is a weld around the outer side of the inlet / outlet 111. Due to existing process issues, the aforementioned slit 113 exists before the weld. Optionally, a blocking structure 14 is provided between the two monopole plates 1. The blocking structure 14 can prevent fluid passing through the inlet / outlet 111 from entering the slit 113. The blocking structure 14 allows gas to directly enter the distribution area 13, which not only reduces flow resistance but also prevents gas from entering the slit 113 and then returning from the slit 113 to the inlet / outlet 111, thus avoiding gas flow disturbance and affecting intake consistency, and improving the intake consistency between adjacent bipole plates of the fuel cell.

[0077] In this embodiment, the anode gas inlet, anode gas outlet, cathode gas inlet, and cathode gas outlet are all provided with a blocking structure 14.

[0078] In this embodiment, the blocking structure 14 is a protrusion formed by stamping the lower monopolar plate 1 in the bipolar plate. The protrusion protrudes upward from the lower monopolar plate 1 in the bipolar plate and extends out from the air inlet / outlet 111. Its top is higher than the upper monopolar plate 1 in the bipolar plate. By using the protrusion to block the slit 113, gas can be prevented from entering the slit 113. The protrusion can be stamped together with the monopolar plate 1, which is convenient to use existing forming processes and does not require additional forming processes, making the operation simple.

[0079] Of course, in other embodiments, the blocking structure 14 can also be configured as an arc-shaped blocking platform connecting the bottom of the inlet / outlet 111 and the opening end face of the inlet / outlet 111. In other words, the bottom of the arc-shaped blocking platform is connected to the lower monopolar plate 1 in the bipolar plate without any gap, and the top of the blocking platform is flush with the opening end face of the inlet / outlet 111. The blocking platform can also be used to block the slit 113 to prevent gas from entering the slit 113.

[0080] This embodiment also provides a fuel cell, including multiple bipolar plates as described above, with the multiple bipolar plates stacked in a layered manner. By applying the bipolar plates described above, the fuel cell of this embodiment has the same beneficial effects as the bipolar plates described above, and will not be repeated here.

[0081] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A bipolar plate comprising two fixedly connected monopolar plates (1), wherein the monopolar plate (1) comprises a common flow channel opening region (11), an active region (12) and a distribution region (13) located between the common flow channel opening region (11) and the active region (12), wherein the active region (12) is provided with a plurality of active region flow channels extending along a first direction; Its features are, The allocation area (13) is provided with an allocation structure (2), which includes multiple allocation units (21) stacked together. Each allocation unit (21) includes multiple allocation components (211) arranged in an array. Each allocation component (211) includes a first allocation block (2111) and a second allocation block (2112). The second allocation block (2112) is located above the first allocation block (2111), and one end of the second allocation block (2112) is connected to one end of the first allocation block (2111) to form a V-shape. The structure includes a first angle (α1) between the first distribution block (2111) and the first direction, and a second angle (α2) between the second distribution block (2112) and the first direction. Along the longitudinal direction of the array, one end of the second distribution block (2112) of one of two adjacent distribution components is fixedly connected to the first distribution block (2111) of the other. Along the transverse direction of the array, one end of the second distribution block (2112) of one of two adjacent distribution components is fixedly connected to the first distribution block (2111) of the other. One of the distribution area (13) and the distribution structure (2) is provided with multiple protrusions (131), and the other is provided with multiple grooves. The multiple protrusions (131) and the multiple grooves are inserted into each other in a one-to-one correspondence. The common flow channel area (11) includes multiple air inlets and outlets (111). A connecting structure (112) is provided on the outside of the air inlets and outlets (111). Two single plates (1) are fixedly connected through the connecting structure (112). A slit (113) is formed between the two single plates (1). The slit (113) is located between the air inlets and outlets (111) and the connecting structure (112). A blocking structure (14) is provided between the two monopole plates (1), which can prevent fluid passing through the air inlet / outlet (111) from entering the slit (113).

2. The bipolar plate according to claim 1, characterized in that, The width k1 of the first allocation block (2111) is 50μm-250μm; and / or, The width k2 of the second allocation block (2112) is 50μm-250μm.

3. The bipolar plate according to claim 1, characterized in that, The angle of the first included angle (α1) is 0°-85°; and / or, The angle of the second included angle (α2) is 0°-85°.

4. The bipolar plate according to claim 1, characterized in that, Along the longitudinal direction of the array, the spacing m between two adjacent first allocation blocks (2111) is 50 μm-400 μm; and / or, Along the transverse direction of the array, the spacing n between two adjacent second allocation blocks (2112) is 50μm-400μm.

5. The bipolar plate according to claim 1, characterized in that, The angle θ between the second distribution block (2112) and the first distribution block (2111) of the V-shaped structure is 20°-60°.

6. The bipolar plate according to claim 1, characterized in that, The distribution area (13) is provided with a distribution slot, and the distribution structure (2) is located in the distribution slot.

7. The bipolar plate according to claim 6, characterized in that, Along a direction perpendicular to the monopole plate (1), the thickness of the distribution structure (2) is equal to the depth of the distribution groove.

8. A fuel cell, characterized in that, It includes a plurality of bipolar plates as described in any one of claims 1-7, wherein the plurality of bipolar plates are stacked.

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