A bipolar plate with a quick drainage function and a fuel cell

Abstract

This invention discloses a bipolar plate and fuel cell with rapid drainage function, relating to the field of fuel cells. The bipolar plate body includes a bipolar plate body comprising a first back ridge and a second back ridge continuously and alternately arranged on a substrate, wherein a recessed drainage groove is formed between the first back ridge and the second back ridge; a hydrogen flow channel is formed on the inner side of the first back ridge, and a coolant flow channel is formed on the inner side of the second back ridge; the ridges of the first back ridge and the second back ridge are in the same plane; the bipolar plate body also includes drainage plates arranged perpendicular to the plane containing the ridges, with gaps between the drainage plate groups to form a gas / water mixing flow channel. The bipolar plate of this invention, while having hydrogen flow channels, coolant flow channels, and air / oxygen flow channels, also provides drainage functionality to the air / oxygen flow channel through a unique structural design, preventing "flooding" of the fuel cell, accelerating drainage speed, and improving the humidification effect on hydrogen.

Description

Technical Field

[0001] This invention relates to the field of fuel cells, and in particular to a bipolar plate with rapid drainage function and a fuel cell. Background Technology

[0002] A proton exchange membrane fuel cell (PEMFC) is a type of fuel cell that, in principle, is the "reverse" device of water electrolysis. A single cell consists of an anode, a cathode, and a membrane electrode assembly (MEA). Taking a hydrogen-fueled PEMFC as an example, the anode is where hydrogen fuel oxidation occurs, while the cathode is where the oxidant is reduced. Both electrodes contain catalysts that accelerate the electrochemical reactions at the electrodes. The proton exchange membrane, acting as a proton transfer medium, allows only protons to pass through, while electrons lost by the hydrogen pass through the external load and wires.

[0003] like Figure 2 As shown, a proton exchange membrane hydrogen fuel cell consists of a current collector, a diffusion layer, a catalyst layer, and a proton exchange membrane. The bipolar plate, also known as a current collector, is made of graphite or alloy with a channeled structure and is used for gas distribution, coolant collection, and battery sealing. The diffusion layer is composed of carbon cloth and serves to conduct gases and water vapor, as well as conduct electricity and dissipate heat. The catalyst layer is a thin layer formed of Pt / C and is used to accelerate the electrochemical reaction. The proton exchange membrane is used to conduct protons and isolate electrons and reactant gases; it is generally composed of a fluorosulfonic acid membrane, a Nafion membrane, or a non-fluorinated polymer membrane.

[0004] Structurally, bipolar plates are a core component of fuel cells, primarily functioning to support the MEA (Mechanical Exchange Membrane), provide fluid channels for hydrogen, oxygen, and coolant, separate hydrogen and oxygen, collect electrons, and conduct heat. To put it simply, if the fuel cell stack is viewed as the human body, the bipolar plates are equivalent to the skeleton and blood vessels. The MEA mainly consists of components such as the proton exchange membrane, catalyst layer, and diffusion layer, typically with a thickness of 0.4–0.5 mm, lacking sufficient self-supporting stiffness and strength. In contrast, bipolar plates are usually made of rigid materials, with higher compressive strength than the MEA, thus providing support for it. In short, the bipolar plates are like the "skeleton" of the fuel cell stack, supporting the soft tissue, the MEA.

[0005] Proton exchange membrane fuel cells generate a large amount of waste heat and water when operating at high power density. If the waste heat and water are not removed in time, local overheating and flooding may occur. The function of the proton exchange membrane is greatly affected by temperature and humidity. When the temperature and humidity do not meet the standards, the proton exchange membrane will fail, thereby affecting the performance and operational safety of the proton exchange membrane fuel cell. At the same time, the structure of the bipolar plate directly determines the area utilization rate of the bipolar plate components, thus directly affecting the power density of the fuel cell stack.

[0006] Therefore, how to provide a bipolar plate with rapid drainage function to facilitate the rapid discharge of reaction water and avoid the "flooding" phenomenon is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a bipolar plate and fuel cell with rapid drainage function. Utilizing the unique structure of the bipolar plate, while having hydrogen flow channels, coolant flow channels, and air / oxygen flow channels, a unique structural design also endows the air / oxygen flow channel with drainage function, forming a gas / water mixing flow channel (the gas / water mixing flow channel refers to the common flow channel of air and / or oxygen, and water generated by electrochemical reaction), preventing the fuel cell from flooding. Through an additional humidification structure, the water generated by the electrochemical reaction is reused to self-humidify the air and hydrogen, ensuring the operating temperature and humidity of the proton exchange membrane. A drainage guide plate is installed in the mixing channel to accelerate the drainage speed, and simultaneously improves the humidification effect of oxygen / air during the air / oxygen-driven drainage process.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: The present invention provides a bipolar plate with a rapid drainage function, comprising a bipolar plate body, wherein the bipolar plate body comprises a first back ridge and a second back ridge continuously and alternately arranged on a substrate, wherein a recessed drainage groove is formed between the first back ridge and the second back ridge. A hydrogen flow channel is formed on the inner side of the first ridge, and a coolant flow channel is formed on the inner side of the second ridge; the ridges of the first ridge and the second ridge are in the same plane; The bipolar plate body also includes a flow guide plate disposed perpendicular to the plane where the ridge is located. The flow guide plate is fixed to the ridge of the first back ridge and the second back ridge across the flow guide groove. At least two flow guide plates are evenly arranged along the length direction of the first back ridge or the second back ridge to form a flow guide plate group. At least two groups of flow guide plates are disposed along the width direction of the first back ridge and the second back ridge, and gaps are left between the flow guide plate groups to form an air / water mixing channel. A gap is also left between adjacent diversion plates in the same diversion plate group to form a gas / water mixing channel, and the diversion plate has an inclined surface that diverts water in the opposite direction to the hydrogen flow direction.

[0009] Preferably, both the first and second dorsal ridges are trapezoidal structures.

[0010] Preferably, the bipolar plate body further includes: Hydrogen inlet chamber and hydrogen inlet are used to connect one side of the hydrogen flow channel. Hydrogen collection chamber and hydrogen outlet are used to connect the other side of the hydrogen flow channel; Coolant inlet chamber and coolant inlet for connecting one side port of the coolant flow channel; The coolant manifold and coolant outlet are used to connect the coolant flow channel to the other side port.

[0011] Preferably, the hydrogen inlet chamber and hydrogen inlet are located below the bipolar plate body when it is in the working position, while the coolant inlet chamber and coolant inlet are located above the bipolar plate body when it is in the working position.

[0012] Preferably, the side of the bipolar plate body is provided with an air / oxygen inlet and an air / oxygen outlet that connect to the gas / water mixing channel.

[0013] Preferably, the bipolar plate body has a water collection channel with a water-blocking edge at the bottom of the gas / water mixing channel, and a water collection port is provided at the lower part of the water collection channel; The bottom surface of the hydrogen inlet chamber is inclined with the hydrogen inlet at its highest point. The water collection port is connected to the hydrogen inlet chamber through a U-shaped water distribution pipe and is adjacent to the hydrogen inlet to wet the hydrogen. The lower part of the bottom surface of the hydrogen inlet chamber is connected to a drain outlet through a U-shaped drain pipe.

[0014] Preferably, the U-shaped water distribution pipe has multiple water distribution holes evenly arranged at its port inside the hydrogen inlet chamber.

[0015] Preferably, the hydrogen inlet, hydrogen outlet, air / oxygen inlet, air / oxygen outlet, coolant inlet, coolant outlet, and drain outlet are all disposed through the bipolar plate body to connect to a common pipeline.

[0016] The present invention also provides a fuel cell, including the above-mentioned bipolar plate body, wherein bolt holes are provided at the corners of the bipolar plate body, the bolt holes are used to press multiple sets of the bipolar plate bodies to assemble into a fuel cell, and the contact surfaces of the multiple sets of bipolar plate bodies are provided with sealing rings that conform to the contour of the bipolar plate body.

[0017] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects: In this invention, the hydrogen flow channel and coolant flow channel in the bipolar plate are used to circulate hydrogen gas and coolant, respectively. The first and second back ridges forming the hydrogen flow channel and coolant flow channel are both trapezoidal, with the bottom edges of the first and second back ridges facing the membrane electrode. The guide plate assembly is perpendicular to and fixed to the ridges of the first and second back ridges on one hand, and perpendicular to the membrane electrode on the other hand, providing support. Thus, the guide plate assembly, the first and second back ridges, while forming the necessary flow channels, also provide sufficient structural strength for the electrochemical reaction zone of the bipolar plate body to meet the clamping force conditions of multiple sets of bipolar plate bodies being pressed together to form a stack.

[0018] In this invention, the first and second back ridges, along with the guide plate assembly, form a hydrogen flow channel, a coolant flow channel, and a gas / water mixing channel (the gas / water mixing channel refers to the common channel for air and / or oxygen, and water generated by electrochemical reaction), giving the bipolar plate a four-channel function. Furthermore, each channel is rationally designed and works in harmony with the others. Specifically, air can enter the electrochemical reaction zone of the gas / water mixing channel along the air / oxygen inlet to participate in the reaction. The resulting reaction water can flow rapidly out through the guide plate and ultimately enter the hydrogen inlet chamber to wet the hydrogen before being discharged through the drain outlet.

[0019] This design significantly optimizes the existing bipolar plate structure. While maintaining the existing small thickness of the bipolar plate, it incorporates hydrogen flow channels, coolant flow channels, and air / oxygen flow channels. Furthermore, through a unique structural design, it endows the air / oxygen flow channels with drainage functionality. Simultaneously, the water generated by the air participating in the electrochemical reaction enters the hydrogen inlet chamber and can self-humidify the hydrogen through a U-shaped water distribution pipe. This helps maintain the operating temperature of the proton exchange membrane and avoids the "flooding" problem. The bipolar plate also has a rapid drainage function. The rapid discharge of water can also remove the generated heat in a timely manner, which is beneficial for heat dissipation and avoids local overheating. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the structure of a bipolar plate with rapid drainage function according to the present invention.

[0022] Figure 2 This is a schematic diagram illustrating the working principle of proton exchange membrane hydrogen fuel cells in existing technologies.

[0023] Figure 3 This is a front view of the present invention from the side of the hydrogen flow channel.

[0024] Figure 4 This is a front view of the invention from the air inlet side.

[0025] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure along the AA direction.

[0026] Figure 6 This is a schematic diagram of the overall flow channel distribution of the bipolar plate body in this invention.

[0027] Figure 7 This is a schematic diagram of the distribution structure of the water distribution holes.

[0028] Figure 8This is a schematic diagram of the flow paths of hydrogen, air, and coolant in the bipolar plate body of the present invention.

[0029] Figure 9 This is one of the schematic diagrams of the flow channel distribution in the electrochemical reaction zone of this invention.

[0030] Figure 10 This is the second schematic diagram of the flow channel distribution in the electrochemical reaction zone of this invention.

[0031] In the picture: 100. Hydrogen flow channel; 101. First ridge; 102. Second ridge; 103. Spine. 110. Hydrogen inlet chamber; 111. Water-blocking protrusion; 120. Hydrogen inlet; 130. Hydrogen collection chamber; 140. Hydrogen outlet. 200, coolant flow channel; 210, coolant inlet chamber; 220, coolant inlet; 230, coolant manifold chamber; 240, coolant outlet. 300, air / water mixing channel; 301, diversion channel; 310, air / oxygen inlet; 320, air / oxygen outlet; 330, water-blocking side; 340, water collection channel; 341, water collection port; 400. Drainage plate assembly; 401. Drainage plate; 402. Inclined surface. 500, U-shaped water distribution pipe; 510, water distribution hole; 600, U-shaped drain pipe; 700. Drainage outlet; 800, bolt holes; 900. Sealing ring. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0035] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0036] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0037] based on Figure 2 The working principle of a conventional proton exchange membrane hydrogen fuel cell is shown. Hydrogen gas is introduced into the anode plate of the bipolar plate and enters the catalyst layer through the diffusion layer. Under the action of the catalyst, hydrogen loses electrons and decomposes into positively charged protons (H+). + ) and negatively charged electrons (e - Protons pass through the proton exchange membrane, releasing heat during the decomposition process, while electrons flow along the external circuit through the load to the cathode; air or oxygen is introduced into the cathode plate, and under the action of a catalyst, it combines with protons to generate reactive water.

[0038] like Figure 2As shown, N bipolar plates are stacked and arranged in an orderly manner, with gas diffusion layer / catalyst layer / proton exchange membrane / catalyst layer / gas diffusion layer sandwiched between adjacent bipolar plates. The adjacent bipolar plates are effectively sealed by sealing rings, and the bipolar plates are then pressed together with appropriate pressure by bolts or straps to form a fuel cell (stack).

[0039] Existing proton exchange membrane fuel cells generate a large amount of waste heat and water when operating at high power density. If the waste heat and water are not discharged in time, local overheating and flooding may occur. The function of the proton exchange membrane is greatly affected by temperature and humidity. When the temperature and humidity do not meet the standards, the proton exchange membrane will fail, thereby affecting the performance and operational safety of the proton exchange membrane fuel cell, and also failing to meet the requirements of high-power fuel cells.

[0040] To avoid the problems of "local overheating" and "flooding" in the aforementioned existing technologies, such as Figure 1 , Figure 3 and Figure 4 As shown, the present invention provides a bipolar plate with a rapid drainage function, including a bipolar plate body, the bipolar plate body including a first back ridge 101 and a second back ridge 102 continuously and alternately arranged on a substrate, wherein a recessed drainage groove 301 is formed between the first back ridge 101 and the second back ridge 102. Combination Figure 9 and Figure 10 As shown, a hydrogen flow channel 100 is formed on the inner side of the first ridge 101, and a coolant flow channel 200 is formed on the inner side of the second ridge 102; the ridges 103 of the first ridge 101 and the second ridge 102 are in the same plane. The bipolar plate body also includes a flow guide plate 401 disposed perpendicular to the plane where the ridge 103 is located. The flow guide plate 401 is fixed to the ridge 103 of the first back ridge 101 and the second back ridge 102 across the flow guide groove 301. At least two flow guide plates 401 are uniformly arranged along the length direction of the first back ridge 101 or the second back ridge 102 to form a flow guide plate group 400. At least two groups of flow guide plate groups 400 are disposed along the width direction of the first back ridge 101 and the second back ridge 102, and gaps are left between the flow guide plate groups to form an air / water mixing channel 300 (the air / water mixing channel 300 refers to a common channel for air and / or oxygen, and water generated by electrochemical reaction). A gap is also left between adjacent diversion plates 401 within the same diversion plate group 400 to form a gas / water mixing channel 300, and the diversion plate 401 has an inclined surface 402 that diverts water in the opposite direction to the hydrogen flow direction.

[0041] This invention utilizes a uniquely designed bipolar plate structure. The first back ridge 101 and the second back ridge 102 respectively form a hydrogen flow channel 100 for flowing hydrogen gas and a coolant flow channel 200 for flowing coolant. Since both the first back ridge 101 and the second back ridge 102 are trapezoidal structures, the hydrogen flow channel 100 and the coolant flow channel 200 also have trapezoidal cross-sectional structures. The trapezoidal base of the hydrogen flow channel 100 is close to the membrane electrode, which helps to increase the contact area between the hydrogen flow channel 100 and the membrane electrode, enhancing the diffusion and penetration of hydrogen gas. The coolant flow channel 200 is used to circulate the cooling medium, and its trapezoidal base is close to the membrane electrode, which helps to enhance heat dissipation and prevent local overheating of the membrane electrode.

[0042] Meanwhile, the first back ridge 101, the second back ridge 102, and the drainage plate group 400 in this invention have good structural strength, which makes it easy to press the membrane electrode and assemble the stack through the sealing element. It can withstand appropriate pressure to achieve a good sealing effect and avoid leakage of the medium.

[0043] In a preferred embodiment, the diversion plate 401 is integrally formed or connected from two symmetrically arranged inclined plates. The number, arrangement (aligned, staggered, tilted perpendicular to the first and second ridges, tilted at an angle relative to the first and second ridges, etc.), and spacing of the diversion plates 401 can be set differently as needed, which is beneficial for uniform oxygen / air transport. The inclined surface 402 of the diversion plate 401 ensures that water generated at any position can be discharged through the inclined surface 402. The gap between the diversion plates 401 forms a flow channel to facilitate concentrated water discharge. The diversion plate 401 has a thickness that ensures the diffusion layer is fixed, which, together with the appropriate number, arrangement, and spacing of the diversion plates, ensures the fixation of the diffusion layer. The diversion plate 401 and the diversion trough 301 can cooperate simultaneously for drainage. In particular, when the diversion plate 401 is tilted at an angle relative to the first ridge 101 and the second ridge 102, it is more conducive to water being discharged from the diversion trough 301.

[0044] Combination Figure 1 In the embodiment shown, the drainage plates 401 are arranged in a symmetrical configuration of 4 horizontally and 11 vertically.

[0045] To improve the fluidity of the medium within the bipolar plate, the bipolar plate body further includes: a hydrogen inlet chamber 110 and a hydrogen inlet 120 for connecting one side of the hydrogen flow channel 100; a hydrogen collection chamber 130 and a hydrogen outlet 140 for connecting the other side of the hydrogen flow channel 100; a coolant inlet chamber 210 and a coolant inlet 220 for connecting one side of the coolant flow channel 200; and a coolant collection chamber 230 and a coolant outlet 240 for connecting the other side of the coolant flow channel 200.

[0046] It is worth noting that, in a preferred embodiment, the hydrogen inlet chamber 110 and the hydrogen inlet 120 are located below the bipolar plate body when it is in the working position, while the coolant inlet chamber 210 and the coolant inlet 220 are located above the bipolar plate body when it is in the working position.

[0047] Utilizing the low density and easy diffusion properties of hydrogen, it flows naturally from bottom to top through the electrochemical reaction zone, ensuring complete hydrogen reaction and allowing unreacted hydrogen to flow into the hydrogen collection chamber 130. The coolant inlet chamber 210 and coolant inlet 220 are positioned above the bipolar plates of the four-channel fuel cell when in operating mode, allowing the coolant to flow from top to bottom through the electrochemical reaction zone to complete the cooling process. Furthermore, the area of ​​the coolant inlet 220 is larger than that of the coolant outlet 240, which helps control the flow rate and velocity of the coolant within the cooling channel 200, ensuring sufficient heat exchange time and optimal heat dissipation.

[0048] Based on the same principle, setting the area of ​​the hydrogen inlet 120 to be larger than the area of ​​the hydrogen outlet 140 is beneficial for controlling the flow rate and velocity of hydrogen and ensuring that hydrogen diffuses fully.

[0049] Combination Figure 3 As shown, the coolant inlet 220 and coolant outlet 240 are respectively located at the top and bottom of the manifold, ensuring the maximum bipolar plate cooling area.

[0050] To facilitate the supply of air / oxygen to the electrochemical reaction zone, an air / oxygen inlet 310 and an air / oxygen outlet 320, connecting to the gas / water mixing channel 300, are provided on the side of the bipolar plate body. Furthermore, the area of ​​the air / oxygen inlet 310 is larger than the area of ​​the air / oxygen outlet 320. This arrangement increases the air intake volume, thereby accelerating the air crossflow velocity. Correspondingly, the air / oxygen inlet 310 is arranged from both sides of the manifold, which is beneficial for increasing the air / oxygen intake. The larger area of ​​the air / oxygen inlet 310 compared to the outlet 320 facilitates control of air flow rate and velocity, ensuring sufficient air / oxygen reaction.

[0051] In order to specifically solve the problem of discharge of reaction water, and at the same time use the reaction water to ensure the temperature and humidity conditions of the membrane electrode, the bipolar plate body is inclinedly provided with a water collection channel 340 with a water-blocking edge 330 at the bottom of the gas / water mixing channel 300, and a water collection port 341 is opened at the lower part of the water collection channel 340. The bottom surface of the hydrogen inlet cavity 110 is inclined at the hydrogen inlet 120, and a water-blocking protrusion 111 is provided inside the hydrogen inlet cavity 110 near the hydrogen inlet 120 to prevent water from entering the common pipeline of the hydrogen inlet 120. The water collection port 341 is connected to the hydrogen inlet cavity 110 and adjacent to the hydrogen inlet 120 through a U-shaped water distribution pipe 500 to wet the hydrogen. The lower part of the bottom surface of the hydrogen inlet cavity 110 is connected to a drain outlet 700 through a U-shaped drain pipe 600. With this design, the hydrogen can be self-humidified by the reaction water. During the process of hydrogen diffusion to the membrane electrode, the water carried away by the hydrogen flow wets the membrane electrode, which helps to control the temperature and humidity of the membrane electrode.

[0052] In this invention, the U-shaped water distribution pipe 500 is provided to isolate the hydrogen inlet chamber 110 from the water collection channel 340, and the U-shaped drain pipe 600 can also isolate the hydrogen inlet chamber 110 from the drain outlet 700 to prevent hydrogen from overflowing.

[0053] In a preferred embodiment, the U-shaped water distribution pipe 500 has a plurality of water distribution holes 510 evenly arranged at the port inside the hydrogen inlet chamber 110 (as shown in the figure, there are 12 holes), which is more conducive to the hydrogen flow atomizing the reaction water.

[0054] In this invention, the water produced by the battery reaction can be discharged through the drain outlet 700 after humidifying the hydrogen gas through the water collection channel 340 and the U-shaped water distribution pipe 500. Alternatively, it can be discharged through the air / oxygen outlet 320 by air propulsion.

[0055] In a preferred embodiment, the hydrogen inlet 120, hydrogen outlet 140, air / oxygen inlet 310, air / oxygen outlet 320, coolant inlet 220, coolant outlet 240, and drain outlet 700 are all disposed through the bipolar plate body to connect to a common pipeline.

[0056] The present invention also provides a fuel cell, including the above-mentioned bipolar plate body. Bolt holes 800 are provided at the corners of the bipolar plate body. The bolt holes 800 are used to press multiple sets of the bipolar plate bodies to assemble them into a fuel cell. The contact surfaces of the multiple sets of bipolar plate bodies are provided with sealing rings 900 that conform to the contour of the bipolar plate body, so that the multiple sets of bipolar plates can be assembled into a fuel cell after being stacked and pressed. Under appropriate pressing force, the sealing rings 900 can play a good sealing role for the medium.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A bipolar plate with rapid drainage function, comprising a bipolar plate body, characterized in that, The bipolar plate body includes a first back ridge and a second back ridge that are continuously and alternately arranged on a substrate, wherein a recessed drainage groove is formed between the first back ridge and the second back ridge. A hydrogen flow channel is formed on the inner side of the first ridge, and a coolant flow channel is formed on the inner side of the second ridge; the ridges of the first ridge and the second ridge are in the same plane; The bipolar plate body also includes a flow guide plate disposed perpendicular to the plane where the ridge is located. The flow guide plate is fixed to the ridge of the first back ridge and the second back ridge across the flow guide groove. At least two flow guide plates are evenly arranged along the length direction of the first back ridge or the second back ridge to form a flow guide plate group. At least two groups of flow guide plates are disposed along the width direction of the first back ridge and the second back ridge, and gaps are left between the flow guide plate groups to form an air / water mixing channel. A gap is also left between adjacent diversion plates in the same diversion plate group to form a gas / water mixing channel, and the diversion plate has an inclined surface that diverts water in the opposite direction to the hydrogen flow direction.

2. The bipolar plate with rapid drainage function according to claim 1, characterized in that, Both the first and second dorsal ridges are trapezoidal structures.

3. The bipolar plate with rapid drainage function according to claim 1, characterized in that, The bipolar plate body also includes: Hydrogen inlet chamber and hydrogen inlet are used to connect one side of the hydrogen flow channel. Hydrogen collection chamber and hydrogen outlet are used to connect the other side of the hydrogen flow channel; Coolant inlet chamber and coolant inlet for connecting one side port of the coolant flow channel; The coolant manifold and coolant outlet are used to connect the coolant flow channel to the other side port.

4. The bipolar plate with rapid drainage function according to claim 3, characterized in that, The hydrogen inlet chamber and hydrogen inlet are located below the bipolar plate body when it is in the working position, while the coolant inlet chamber and coolant inlet are located above the bipolar plate body when it is in the working position.

5. The bipolar plate with rapid drainage function according to claim 1, characterized in that, The side of the bipolar plate body is provided with an air / oxygen inlet and an air / oxygen outlet that connect to the gas / water mixing channel.

6. The bipolar plate with rapid drainage function according to claim 4, characterized in that, The bipolar plate body has a water collection channel with a water-blocking edge at the bottom of the gas / water mixing channel, and a water collection port is opened at the lower part of the water collection channel. The bottom surface of the hydrogen inlet chamber is inclined with the hydrogen inlet at its highest point. The water collection port is connected to the hydrogen inlet chamber through a U-shaped water distribution pipe and is adjacent to the hydrogen inlet to wet the hydrogen. The lower part of the bottom surface of the hydrogen inlet chamber is connected to a drain outlet through a U-shaped drain pipe.

7. The bipolar plate with rapid drainage function according to claim 6, characterized in that, The U-shaped water distribution pipe has multiple water distribution holes evenly arranged at its port inside the hydrogen inlet chamber.

8. The bipolar plate with rapid drainage function according to claim 6, characterized in that, The hydrogen inlet, hydrogen outlet, air / oxygen inlet, air / oxygen outlet, coolant inlet, coolant outlet, and drain outlet are all installed through the bipolar plate body to connect to the common pipeline.

9. A fuel cell, characterized in that, The bipolar plate body includes any one of claims 1-8, wherein bolt holes are provided at the corners of the bipolar plate body, the bolt holes are used to press multiple sets of the bipolar plate bodies together to assemble a fuel cell, and the contact surfaces of the multiple sets of the bipolar plate bodies are provided with sealing rings that conform to the contour of the bipolar plate body.

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