Fuel cell, fuel cell single cell, and fuel cell polar plate

Abstract

The embodiment of the present application discloses a fuel cell, comprising a plurality of fuel cell single cells. Each fuel cell single cell comprises a membrane electrode assembly, a gas diffusion layer and a fuel cell polar plate. One side of the polar plate comprises: a cooling liquid passage comprising a cooling liquid inlet, a first cooling liquid dispersion area, a cooling liquid flow channel area, a second cooling liquid dispersion area and a cooling liquid outlet which are sequentially communicated in a horizontal direction; and a first bubble area which is communicated with one end of the second cooling liquid dispersion area away from the direction of gravity and is used for storing bubbles in the cooling liquid; the first bubble area is separated from the cooling liquid outlet. The beneficial effect of the present application is to reduce the degree of bubble blockage in the cooling liquid flow channel and to avoid the problem of heat concentration in some areas of the fuel cell.

Description

Technical Field

[0001] This application relates to the field of fuel cells, and more specifically, to fuel cells, fuel cell units, and fuel cell plates. Background Technology

[0002] When a fuel cell is working, hydrogen and oxygen undergo an electrode reaction in the presence of a catalyst, generating heat and water while supplying an electric current. If the heat inside the fuel cell cannot be removed in time, it may reduce the water content within the membrane, disrupting the water balance within the stack and affecting proton conduction and the lifespan of the fuel cell.

[0003] Currently, fuel cell plates have hydrogen or oxygen flow channels on one side, while coolant channels on the other side for heat dissipation. Common coolants include water. Because the hydrogen or oxygen reaction area on the plate is relatively large, meaning the heat generation area is also large, researchers often design corresponding coolant flow channels to ensure the coolant flows evenly across the reaction area and dissipates the accumulated heat.

[0004] However, even fuel cells designed with dedicated coolant channels still suffer from heat concentration in certain areas. Summary of the Invention

[0005] One of the key points of this invention is the inventor's discovery of another reason for heat concentration in certain areas of current fuel cells. The inventor found that existing fuel cells have fine coolant channels on the electrode plates to ensure uniform coolant flow through the reaction zone. However, the coolant contains air bubbles. As the coolant circulates repeatedly through these fine channels, the bubbles gradually become blocked, preventing further coolant flow and causing excessive heat to accumulate in the areas where the bubbles are located on the electrode plates. Based on this discovery, this invention proposes a fuel cell, a fuel cell unit, and fuel cell electrode plates, aiming to solve the aforementioned problems in the prior art.

[0006] To achieve the above objectives, the present invention provides a fuel cell electrode plate, characterized in that one side of the electrode plate includes:

[0007] The coolant passage includes a coolant inlet, a first coolant dispersion zone, a coolant flow channel zone, a second coolant dispersion zone, and a coolant outlet, which are connected sequentially in a horizontal direction.

[0008] The first bubble zone is separated from the coolant outlet and connected to the end of the second coolant dispersion zone away from the direction of gravity through a communication port, for accumulating bubbles in the coolant.

[0009] In the horizontal flow direction of the coolant, the end boundary of the communication port is located downstream of the first bubble zone.

[0010] In some embodiments, the second coolant dispersion zone includes a plurality of protrusions, and the gap between adjacent protrusions is greater than or equal to a preset distance to allow air bubbles to pass through the gap.

[0011] In some embodiments, the electrode plate further includes:

[0012] The first gas inlet is located on the side of the coolant outlet away from the direction of gravity, and is used for the flow of reaction gas;

[0013] A first gas sealing strip is arranged around the first gas port;

[0014] A coolant sealing strip is arranged around the coolant passage, and has a notch as a communication port in the second coolant dispersion area near the first gas sealing strip;

[0015] Two first transition sealing strips are located on both sides of the notch. The two ends of each first transition sealing strip are respectively connected to the coolant sealing strip and the first gas sealing strip to enclose the first bubble area between the coolant sealing strip and the first gas sealing strip.

[0016] In some embodiments, the width of the second coolant dispersion zone in the horizontal direction is W;

[0017] The region located within the second coolant dispersion zone and at a horizontal distance of less than or equal to 0.2W from the coolant outlet has a higher density of protrusions than the region outside the region.

[0018] In some embodiments, at least a portion of the protrusion is an elongated protrusion that extends toward the notch.

[0019] In some embodiments, the width of the second coolant dispersion zone in the horizontal direction is W;

[0020] The region located within the second coolant dispersion zone and at a horizontal distance of less than or equal to 0.2W from the coolant outlet, wherein the length L1 of the elongated protrusion in the gravity direction within the region is greater than the length L2 of the elongated protrusion outside the region in the gravity direction.

[0021] In some embodiments, at least a portion of the protrusions are made using a stamping process;

[0022] The coolant sealing strip, the first gas sealing strip, and the first transition sealing strip are manufactured using injection molding.

[0023] In some embodiments, the electrode plate further includes:

[0024] The second bubble zone is connected to the end of the first coolant dispersion zone away from the direction of gravity, and is used to accumulate bubbles in the coolant.

[0025] The second bubble zone is separate from both the coolant inlet and the coolant flow channel zone.

[0026] In addition, to achieve the above objectives, the present invention also proposes a fuel cell single cell, characterized in that it includes a membrane electrode assembly, a gas diffusion layer, and an electrode plate as described in any of the foregoing embodiments.

[0027] Furthermore, to achieve the above objectives, the present invention also proposes a fuel cell, characterized in that it comprises a plurality of fuel cell single cells as described in any of the foregoing embodiments.

[0028] The fuel cell electrode plate proposed in this application includes a second coolant dispersion region connected to the coolant outlet and a first bubble region; wherein the first bubble region is connected to the end of the second coolant dispersion region away from the direction of gravity. When coolant containing bubbles passes through the second coolant dispersion region, the bubbles rise to the surface and accumulate in the first bubble region due to gravity, thereby reducing the bubble content in the coolant. The first bubble region is separated from the coolant outlet, so that the gas in the first bubble region will not enter the coolant outlet and participate in the next circulation of the coolant, thereby reducing the degree of blockage of bubbles in the coolant flow channel and avoiding the problem of heat concentration in some areas of the fuel cell. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] The methods, systems, and / or procedures shown in the accompanying drawings will be further described with reference to exemplary embodiments. These exemplary embodiments will be described in detail with reference to the drawings. These exemplary embodiments are non-limiting exemplary embodiments, wherein reference numerals in the various views of the drawings represent similar mechanisms.

[0031] Figure 1 This is a first-side structural diagram of the electrode plate involved in some embodiments of this application;

[0032] Figure 2 for Figure 1 The second-side structural diagram of the electrode plate involved;

[0033] Figure 3This is a second-side structural diagram of the electrode plate involved in some other embodiments of this application;

[0034] Figure 4 This is a second-side structural diagram of the electrode plate involved in some embodiments of this application;

[0035] Figure 5 This is a second-side structural diagram of the electrode plate involved in some embodiments of this application.

[0036] Icons: 10-First side, 11-First gas port, 12-First gas dispersion zone, 13-Gas flow channel zone, 14-Second gas dispersion zone, 15-Second gas port, 20-Second side, 21-Coolant inlet, 22-First coolant dispersion zone, 23-Coolant flow channel zone, 24-Second coolant dispersion zone, 25-Coolant outlet, 26-First bubble zone, 27-Second bubble zone, 28-Connecting port, 31-Coolant sealing strip, 32-First gas sealing strip, 33-First transition sealing strip, 34-Notch, 35-Protrusion, 36-Elongated protrusion, 41-Third gas port, 42-Fourth gas port. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0039] The fuel cell in this application includes multiple stacked fuel cell units. Each fuel cell unit includes a cathode plate, a cathode gas diffusion layer, a membrane electrode assembly, an anode gas diffusion layer, and an anode plate, which are sequentially stacked. In the embodiments of this application, the fuel cell electrode plate can be either an anode plate or a cathode plate.

[0040] Please refer to Figure 1 and Figure 2 , Figure 1 and Figure 2This is a schematic diagram of the fuel cell electrode plate in the working position according to an embodiment of this application. The left and right directions in the figure represent the horizontal direction, and the top to bottom represents the direction of gravity. The electrode plate includes a first surface 10 and a second surface 20 facing away from each other. The first surface 10 includes a gas passage, and the second surface 20 includes a coolant passage.

[0041] like Figure 1 As shown, the gas passage of the first surface 10 includes a first gas port 11, a first gas dispersion region 12, a gas flow channel region 13, a second gas dispersion region 14, and a second gas port 15 connected sequentially in the horizontal direction. The first gas port 11 and the second gas port 15 are used for the inflow and outflow of the reaction gas, respectively. Specifically, the first gas port 11 can be used as the inlet of the reaction gas, and the second gas port 15 can be used as the outlet of the reaction gas: the reaction gas flows in from the first gas port 11, and then diffuses uniformly into the gas flow channel region 13 under the action of the first gas dispersion region 12. The reaction gas passes through the corresponding gas diffusion layer in the gas flow channel region 13 and reaches the membrane electrode assembly and undergoes the corresponding electrode reaction. The remaining gas and / or reaction products that do not participate in the electrode reaction are discharged from the second gas port 15 after passing through the second gas dispersion region 14. It should be noted that in this embodiment, the electrode plate can also use the first gas port 11 as the outlet of the reaction gas and the second gas port 15 as the inlet of the reaction gas.

[0042] like Figure 2 As shown, the coolant passage of the second surface 20 includes a coolant inlet 21, a first coolant dispersion zone 22, a coolant flow channel zone 23, a second coolant dispersion zone 24, and a coolant outlet 25 connected sequentially in the horizontal direction. The second coolant dispersion zone 24, the coolant flow channel zone 23, and the first coolant dispersion zone 22 are located on the back sides of the first gas dispersion zone 12, the gas flow channel zone 13, and the second gas dispersion zone 14, respectively. The first gas port 11, the second gas port 15, the coolant inlet 21, and the coolant outlet 25 of the electrode plate penetrate both surfaces of the electrode plate. The first gas port 11 is located on the side of the coolant outlet 25 away from the direction of gravity, and the second gas port 15 is located on the side of the coolant inlet 21 along the direction of gravity.

[0043] In this embodiment, the cooling process of the electrode plate is as follows: the coolant enters the electrode plate from the coolant inlet 21 and flows uniformly to the coolant channel region 23 under the action of the first coolant dispersion region 22. Since the electrode plate material has good thermal conductivity, the heat generated by the reaction in the gas channel region 13 can be absorbed by the coolant in the coolant channel region 23. As the coolant subsequently flows through the second coolant dispersion region 24 and the coolant outlet 25, the heat is carried out of the fuel cell by the coolant.

[0044] In this embodiment, the reactant gas can be hydrogen or oxygen. It can be understood that when the reactant gas is hydrogen, this electrode plate serves as the anode plate of the fuel cell; when the reactant gas is oxygen, this electrode plate serves as the cathode plate of the fuel cell. Figure 1 and Figure 2 As shown, the electrode also includes a third gas port 41 and a fourth gas port 42 penetrating the first surface 10 and the second surface 20. The two serve as channels for another reactant gas to pass through other electrode plates. If the electrode is an anode plate, the third gas port 41 and the fourth gas port 42 serve as channels for oxygen; if the electrode is a cathode plate, the third gas port 41 and the fourth gas port 42 serve as channels for hydrogen.

[0045] Each dispersion region in this embodiment includes multiple protrusions 35, which are used to uniformly distribute gas or coolant. The electrode plate can be manufactured using processes such as stamping, injection molding, and etching. The protruding structure on one side of the electrode plate corresponds to the recessed structure on the other side, such as the channel groove in the gas flow channel region 13 corresponding to the ridge in the coolant flow channel region 23. For ease of demonstration, only... Figure 1 and Figure 2 The protrusion 35 of this dispersion area is shown in the dispersion area, but the protrusion 35 of the other dispersion area on the back side corresponding to the recessed structure of this dispersion area is not shown.

[0046] like Figure 2 As shown, the second surface 20 of the electrode plate also includes a first bubble region 26. The first bubble region 26 is connected to the end of the second coolant dispersion region 24 away from the direction of gravity. Specifically, the first bubble region 26 and the second coolant dispersion region 24 are connected by a connecting port 28. When the coolant flows to the coolant flow channel region 23, the coolant heats up due to absorbing heat from the electrode reaction, which reduces the solubility of gases, and bubbles in the coolant begin to appear and increase in size. In addition, the coolants currently used in fuel cells include pure water, a mixture of ethylene glycol and water, etc., all of which contain water. When the fuel cell is running stably, the temperature here will reach a high temperature of about 80 degrees Celsius. The water in the coolant begins to vaporize at high temperatures, which will also cause bubbles to appear in the coolant. In the direction of coolant flow, the second coolant dispersion region 24 is located downstream of the coolant flow channel region 23. When the coolant flows further to the second coolant dispersion region 24, the bubbles begin to rise under the action of gravity and accumulate in the first bubble region 26, thereby reducing the bubble content in the coolant.

[0047] Furthermore, the first bubble zone 26 is separated from the coolant outlet 25, so that the gas in the first bubble zone 26 will not enter the coolant outlet 25 and participate in the next circulation of the coolant, thereby reducing the degree of bubble blockage in the coolant flow channel zone 23 and avoiding the occurrence of heat concentration in some areas of the fuel cell due to the inability of the coolant to flow normally.

[0048] The gas accumulated in the first bubble zone 26 can be processed and discharged during the periodic maintenance of the fuel cell. In this embodiment, the area ratio of the first bubble zone 26 to the area of ​​the reaction zone (i.e., the coolant flow channel zone 23) is greater than 1 / 10, so that the first bubble zone 26 can completely contain the gas released from the coolant by the electrode plate during operation between two adjacent maintenance cycles.

[0049] Furthermore, in the horizontal flow direction of the coolant, the end boundary of the connecting port 28 is located downstream of the first bubble zone 26, specifically, as shown in... Figure 2 As shown, the end boundary of the connector 28 is the right-side (downstream) boundary line of the connector 28. The distance d indicates that the right-side boundary line of the connector 28 is located entirely to the right of the first bubble region 26. When the fuel cell is regularly maintained, it can be... Figure 2 The electrode plates in the fuel cell are rotated 90 degrees counterclockwise. At this time, the end boundary of the connecting port 28 will be higher than the first bubble region 26, so that the bubbles in the first bubble region 26 can pass through the connecting port 28 and the second coolant dispersion region 24 in sequence and then be discharged from the coolant outlet 25. It can be understood that the end boundary of the connecting port 28 is located downstream of the first bubble region 26, which may include the end boundary of the connecting port 28 coinciding with the right boundary of the first bubble region 26 in the horizontal direction, so that the bubbles can be discharged in the aforementioned manner during fuel cell maintenance.

[0050] In some embodiments, the second coolant dispersion zone 24 includes a plurality of protrusions 35. The protrusions 35 in the second coolant dispersion zone 24 can slow down the flow rate of the coolant, block air bubbles in the coolant, and allow the air bubbles to float smoothly into the first air bubble zone 26. If the gap between two adjacent protrusions 35 is too small, the two adjacent protrusions 35 may obstruct the upward movement of the air bubbles, causing the air bubbles to get stuck between the two adjacent protrusions 35. In this embodiment, the gap between adjacent protrusions 35 is greater than or equal to a preset distance to allow air bubbles to pass through the gap. As a possible approach, the preset distance can be the width of the flow channel groove in the coolant flow channel zone 23, so that air bubbles passing through the flow channel groove are not stuck by two adjacent protrusions 35. The protrusions 35 can be manufactured using a stamping process; specifically, the protrusions 35 can be formed together with the flow channel zone during the electrode stamping process.

[0051] like Figure 3 As shown, in some embodiments, the electrode plate further includes a first gas sealing strip 32, a coolant sealing strip 31, and two first transition sealing strips 33.

[0052] In this embodiment, a first gas sealing strip 32 is arranged around the first gas port 11; a coolant sealing strip 31 is arranged around the coolant passage. In this embodiment, when the plates are subsequently stacked, the second surface 20 where the coolant passage is located needs to be in contact with the second surface 20 of another plate. The sealing strips can fill the gaps when the two plates are in contact, thus preventing coolant and gas leakage. It is understood that sealing strips can also be used around other gas ports to prevent leakage. To avoid overly cluttered illustrations, Figure 3 The sealing strips around these gas ports are omitted. These sealing strips can be manufactured using injection molding in the corresponding areas of the electrode plates.

[0053] In this embodiment, the coolant sealing strip 31 has a notch 34 near the first gas sealing strip 32 in the second coolant dispersion area 24, and two first transition sealing strips 33 are located on both sides of the notch 34. Each first transition sealing strip 33 connects to the coolant sealing strip 31 and the first gas sealing strip 32 at both ends, thus creating a first bubble area 26 between the coolant sealing strip 31 and the first gas sealing strip 32. That is, the first bubble area 26 is the area enclosed by the two first transition sealing strips 33, the coolant sealing strip 31, and the first gas sealing strip 32. The notch 34 of the coolant sealing strip 31 serves as a communication port, allowing the first bubble area 26 to communicate with the second coolant dispersion area 24.

[0054] Some electrode plates are manufactured using a stamping process. When designing the first bubble region 26, it is necessary to consider whether it will adversely affect the reactive gas passage on the back side. It is understandable that, to prioritize the structure of the reactive gas passage, after designing the reactive gas passage, there may not be enough space on the electrode plate for stamping to create the first bubble region 26. In this embodiment, a sealing strip is used to create the first bubble region 26. A distance needs to be maintained between the coolant passage and the gas port of the electrode plate to prevent cross-contamination of coolant and reactive gas due to processing and assembly errors. Therefore, a distance is also maintained between the coolant sealing strip 31 and the first gas sealing strip 32. This embodiment fully utilizes the space between the coolant sealing strip 31 and the first gas sealing strip 32. By adding two first transition sealing strips 33, the first bubble region 26 can be enclosed, simplifying the processing method and saving processing costs.

[0055] In some embodiments, the second coolant dispersion zone 24 has a horizontal width of W, and the area located within the second coolant dispersion zone 24 and whose horizontal distance from the coolant outlet 25 is less than or equal to 0.2W (e.g., Figure 2 and Figure 3The area to the right of the dashed line within the second coolant dispersion zone 24 has a higher density of protrusions 35 than that outside the zone. The density of protrusions 35 within the zone is the ratio of the sum of the areas of all protrusions 35 within the zone to the total area of ​​the zone. In this embodiment, more protrusions 35 are arranged in the area of ​​the second coolant dispersion zone 24 near the coolant outlet 250.2W to better intercept air bubbles and effectively prevent air bubbles from participating in the next coolant circulation through the coolant outlet 25.

[0056] In some embodiments, such as Figure 4 As shown, at least part of the protrusion 35 is an elongated protrusion 36, which extends towards the notch 34. Specifically, in the direction of gravity, the higher end of the elongated protrusion 36 is closer to the notch 34 than the lower end, so that when a bubble is intercepted, it can be guided to rise to the notch 34 more quickly and then enter the first bubble zone 26. Further, the second coolant dispersion zone 24 has a width of W in the horizontal direction, and the area located within the second coolant dispersion zone 24 and whose horizontal distance from the coolant outlet 25 is less than or equal to 0.2W (e.g., Figure 4 The area to the right of the dashed line within the second coolant dispersion zone 24 has an elongated protrusion 36 whose length L1 in the direction of gravity is greater than that of the elongated protrusion 36 outside the area. Since the bubbles flow horizontally with the coolant, the elongated protrusion 36 in this area can better intercept the bubbles, effectively preventing them from participating in the next coolant circulation through the coolant outlet 25. Specifically, while keeping the length of the elongated protrusion 36 constant, the angle between the elongated protrusion 36 and the horizontal direction can be increased. The elongated protrusion 36 can also be manufactured using a stamping process. As a feasible method, when it is impossible to stamp the elongated protrusion 36 in the second coolant dispersion zone 24 in order to prioritize the structure of the reactant gas passage, the elongated protrusion 36 can be manufactured using injection molding.

[0057] In some embodiments, such as Figure 5 As shown, the electrode plate also includes a second bubble region 27. The second bubble region 27 is connected to the end of the first coolant dispersion region 22 away from the direction of gravity, and is used to accumulate bubbles in the coolant. The second bubble region 27 is separate from the coolant inlet 21 and the coolant flow channel region 23. The manufacturing method of the second bubble region 27 is the same as that of the first bubble region 26. It should be noted that when a sealing strip is used to manufacture the second bubble region 27, the gas port corresponding to the sealing strip should be the gas port on the side of the coolant inlet 21 away from the direction of gravity. Figure 5 The fourth gas port 42.

[0058] In this embodiment, when the coolant flows to the first coolant dispersion zone 22, the cross-sectional area of ​​the coolant channel increases, thereby reducing the flow velocity. This allows sufficient time for the bubbles to rise under gravity and accumulate in the second bubble zone 27, thus reducing the bubble content in the coolant. Furthermore, the second bubble zone 27 is separated from both the coolant inlet 21 and the coolant channel zone 23, preventing gas from entering these areas and further reducing bubble blockage in the coolant channel zone 23. Since the coolant in the first coolant distribution zone has not yet absorbed heat from the reaction, its temperature is low, and the gas solubility is high, resulting in fewer bubbles in the coolant. Therefore, the volume of the second bubble zone 27 can be smaller than the volume of the first bubble zone 26.

[0059] Some embodiments of this application relate to a fuel cell comprising multiple fuel cell units. Each fuel cell unit includes a membrane electrode assembly, a gas diffusion layer, and the electrode plates described in any of the foregoing embodiments.

[0060] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0061] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0062] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0063] It should be noted that similar reference numerals and letters in the figures of this application 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.

[0064] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application 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 this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0065] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0066] For each patent, patent application, patent application publication, and other material such as articles, books, specifications, publications, and documents referenced in this application, the entire contents of that patent application are incorporated herein by reference, except for historical application documents that are inconsistent with or conflict with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or subsequently appended to this application). It should be noted that if there are any inconsistencies or conflicts between the descriptions, definitions, and / or terminology used in the supplementary materials of this application and the content of this application, the descriptions, definitions, and / or terminology used in this application shall prevail.

Claims

1. A fuel cell electrode plate, characterized in that, One side of the electrode plate includes: The coolant passage includes a coolant inlet, a first coolant dispersion zone, a coolant flow channel zone, a second coolant dispersion zone, and a coolant outlet, which are connected sequentially in a horizontal direction. The first bubble zone is separated from the coolant outlet and connected to the end of the second coolant dispersion zone away from the direction of gravity through a communication port, for accumulating bubbles in the coolant. In the horizontal flow direction of the coolant, the end boundary of the communication port is located downstream of the first bubble zone; The second coolant dispersion zone includes multiple protrusions, and the gap between adjacent protrusions is greater than or equal to a preset distance to allow air bubbles to pass through the gap; The first gas inlet is located on the side of the coolant outlet away from the direction of gravity, and is used for the flow of reaction gas; A first gas sealing strip is arranged around the first gas port; A coolant sealing strip is arranged around the coolant passage, and has a notch as a communication port in the second coolant dispersion area near the first gas sealing strip; The width of the second coolant dispersion zone in the horizontal direction is W; The area located within the second coolant dispersion zone and at a horizontal distance of less than or equal to 0.2W from the coolant outlet has a higher density of protrusions than the density of protrusions outside the area. At least a portion of the protrusions are elongated protrusions that extend toward the notch.

2. The electrode plate as described in claim 1, characterized in that, The electrode plate also includes: Two first transition sealing strips are located on both sides of the notch. The two ends of each first transition sealing strip are respectively connected to the coolant sealing strip and the first gas sealing strip to enclose the first bubble area between the coolant sealing strip and the first gas sealing strip.

3. The electrode plate as described in claim 1, characterized in that, The width of the second coolant dispersion zone in the horizontal direction is W; The region located within the second coolant dispersion zone and at a horizontal distance of less than or equal to 0.2W from the coolant outlet, wherein the length L1 of the elongated protrusion in the gravity direction within the region is greater than the length L2 of the elongated protrusion outside the region in the gravity direction.

4. The electrode plate as described in claim 2, characterized in that, At least some of the protrusions are made using a stamping process; The coolant sealing strip, the first gas sealing strip, and the first transition sealing strip are manufactured using injection molding.

5. The electrode plate as described in claim 1, characterized in that, The electrode plate also includes: The second bubble zone is connected to the end of the first coolant dispersion zone away from the direction of gravity, and is used to accumulate bubbles in the coolant. The second bubble zone is separate from both the coolant inlet and the coolant flow channel zone.

6. A fuel cell single cell, characterized in that, It includes a membrane electrode assembly, a gas diffusion layer, and an electrode plate as described in any one of claims 1-5.

7. A fuel cell, characterized in that, It includes multiple fuel cell single cells as described in claim 6.

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