A plate and a fuel cell single cell

Abstract

The present application relates to a plate electrode and a fuel cell single cell. The plate electrode includes: a plate electrode body provided with a flow channel, the flow channel including a bottom wall, a first side wall and a second side wall, the first side wall and the second side wall being oppositely arranged on both sides of the bottom wall; a flow guiding member disposed in the flow channel, the flow guiding member including a first water guiding plate, a second water guiding plate and a plurality of gas guiding plates, both the first water guiding plate and the second water guiding plate extending along the length direction of the flow channel, the plurality of gas guiding plates being spaced between the first water guiding plate and the second water guiding plate, one end of each gas guiding plate being close to the bottom wall and the other end being inclined towards the outlet of the flow channel, the first water guiding plate being close to the first side wall to reduce the volume of water droplets on the first side wall, and the second water guiding plate being close to the second side wall to reduce the volume of water droplets on the second side wall. The gas guiding plates guide the gas to blow the droplets on the surface of the diffusion layer to both sides, reducing the covered area of the diffusion layer. The droplets will touch the water guiding plates on both sides and break, thereby avoiding the increase of droplets and accelerating the drainage efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and more particularly, to a bipolar plate and a fuel cell single cell. Background Art

[0002] Generally, dozens or hundreds of flow channels are provided on the bipolar plate of a fuel cell single cell, and their function is to provide reaction gases (such as hydrogen or air) for the electrochemical reaction. Water is generated in the electrochemical reaction of the fuel cell single cell, and a part of the water may condense into a liquid state. The liquid water is likely to condense into droplets on the surface of the gas diffusion layer and the side wall of the flow channel, affecting gas diffusion. Moreover, the large amount of condensed liquid water easily causes the problem of flooding in the flow channel, resulting in a decrease in gas flow velocity. The decrease in gas flow velocity and poor diffusion will in turn lead to poor drainage, forming a vicious cycle, seriously affecting the performance of the battery. Summary of the Invention

[0003] The present application aims to provide a bipolar plate and a fuel cell single cell to alleviate the problem of condensed liquid water and improve the drainage efficiency.

[0004] The embodiments of the present application are implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a bipolar plate, which includes:

[0006] A bipolar plate body provided with a flow channel, the flow channel including a bottom wall, a first side wall and a second side wall, the first side wall and the second side wall being oppositely arranged on both sides of the bottom wall;

[0007] A flow guiding member disposed in the flow channel, the flow guiding member including a first water guiding plate, a second water guiding plate and a plurality of gas guiding plates. The first water guiding plate and the second water guiding plate both extend along the length direction of the flow channel, and the plurality of gas guiding plates are spaced between the first water guiding plate and the second water guiding plate. One end of each gas guiding plate is close to the bottom wall and the other end is inclined towards the outlet of the flow channel. The first water guiding plate is close to the first side wall to reduce the volume of water droplets on the first side wall, and the second water guiding plate is close to the second side wall to reduce the volume of water droplets on the second side wall.

[0008] In the technical solution provided by the present application, the first water guiding plate, the second water guiding plate and the plurality of gas guiding plates cooperate. The gas guiding plates guide the gas flow towards the diffusion layer, which not only improves the gas diffusion effect, but also blows the liquid water on the surface of the diffusion layer to both sides, reducing the surface area of the diffusion layer covered by the droplets, so that the liquid water mainly condenses at the interface between the diffusion layer and the side wall of the flow channel. When the liquid water condenses into droplets, it will touch the surfaces of the first water guiding plate and the second water guiding plate (hereinafter referred to as the plate surfaces), and the hydrophilic effect of the plate surfaces causes the droplets to break and drain away, thereby reducing the volume of the droplets and accelerating the drainage efficiency.

[0009] In some embodiments of the present application, the distance between the first water guide plate and the top of the first side wall is less than the distance between the first water guide plate and the bottom wall, and the distance between the second water guide plate and the top of the second side wall is less than the distance between the second water guide plate and the bottom wall.

[0010] In the above technical solution, the first water guide plate and the second water guide plate are closer to the diffusion layer relative to the bottom wall, which is beneficial for contacting and reducing droplets.

[0011] In some embodiments of the present application, the first water guide plate is fixed to the first side wall and / or the second water guide plate is fixed to the second side wall, and each air guide plate is arranged at an interval from the bottom wall.

[0012] In the above technical solution, the flow guiding member is fixed in the flow channel through the first water guide plate and / or the second water guide plate. Each air guide plate is spaced from the bottom wall, and the air guide plate does not block the water flow on the bottom wall, so that the liquid water on the bottom wall can be quickly drained away. In addition, the gas can be accelerated when flowing through the interval between the air guide plate and the bottom wall, so as to accelerate the blowing away of the liquid water on the surface of the bottom wall.

[0013] In some embodiments of the present application, the edge of the first water guide plate is bent away from the bottom wall to form a first arc portion, and the first arc portion fits against the first side wall;

[0014] The edge of the second water guide plate is bent away from the bottom wall to form a second arc portion, and the second arc portion fits against the second side wall.

[0015] In the above technical solution, when the flow guiding member is installed in the flow channel, the first arc portion and the second arc portion play a guiding role. The first arc portion fits against the first side wall and the second arc portion fits against the second side wall, so as to elastically snap the flow guiding member into the flow channel, which is convenient for installing and fixing the flow guiding member, and is also convenient for adjusting the installation height of the flow guiding member.

[0016] In some embodiments of the present application, along the length direction of the flow channel, the first arc portion and the second arc portion are respectively provided with a plurality of notches.

[0017] In the above technical solution, by respectively providing a plurality of notches on the first arc portion and the second arc portion, when the first arc portion and the second arc portion slide along the first side wall and the second side wall under the action of an external force, the sliding friction force can be reduced to avoid jamming, so as to facilitate adjusting the height of the flow guiding member.

[0018] In some embodiments of the present application, each air guide plate includes a first part, a second part and a third part connected in sequence. The second part is connected to the first water guide plate and the second water guide plate, and the first water guide plate, the second water guide plate and the plurality of air guide plates are integrally formed by stamping.

[0019] In the above technical solution, by stamping on a thin plate, a first water guide plate, a second water guide plate, and a plurality of air guide plates are formed. The second part of each air guide plate is connected to the first water guide plate and the second water guide plate, and the first part and the third part of each air guide plate are respectively disconnected from the first water guide plate and the second water guide plate. The first part and the third part are respectively folded to be inclined, so as to form an integrated flow guiding member, which does not require an assembly step, is convenient to be installed in a flow channel, has a lower manufacturing cost, and the slopes of the first part and the second part of the air guide plate can be flexibly set according to needs, so that the flow guiding member can meet different requirements.

[0020] In some embodiments of the present application, the flow channel includes a first section and a second section. The inlet of the flow channel is arranged in the first section, and the outlet of the flow channel is arranged in the second section. The flow guiding member is at least arranged in the second section.

[0021] In the above technical solution, the gas first flows through the first section and then through the second section. The gas in the second section is relatively less than that in the first section, and it is easier to have a situation where the gas flow rate decreases. Moreover, the water generated in the first section also needs to be discharged after passing through the second section. Therefore, waterlogging is more likely to occur in the second section. By arranging the flow guiding member in the second section, reducing the droplet volume in the second section and improving the drainage efficiency, the waterlogging problem can be effectively alleviated, and a vicious cycle can be avoided.

[0022] In some embodiments of the present application, the surface of the first water guide plate facing away from the bottom wall and the surface of the second water guide plate facing away from the bottom wall both have a plurality of first hydrophilic regions and a plurality of second hydrophilic regions. Each first hydrophilic region and each second hydrophilic region extend along the length direction of the flow channel. The plurality of first hydrophilic regions and the plurality of second hydrophilic regions are arranged alternately, and the hydrophilicity of the first hydrophilic region is greater than that of the second hydrophilic region.

[0023] In the above technical solution, by arranging the plate surface as a plurality of first hydrophilic regions and a plurality of second hydrophilic regions arranged alternately, and the hydrophilicities of the first hydrophilic region and the second hydrophilic region are different. When a droplet contacts the plate surface, the contact angle between the droplet and the first hydrophilic region and the contact angle between the droplet and the second hydrophilic region are different, and the droplet is more likely to break. After the droplet breaks, a part of it flows away along the first hydrophilic region and the other part flows away along the second hydrophilic region. Moreover, due to the small width of the flow channel of the electrode plate, the widths of the first water guide plate and the second water guide plate are only a few millimeters, so the width of each hydrophilic region is also small, and a capillary phenomenon can be formed to guide the liquid water to drain away quickly.

[0024] In some embodiments of the present application, at least the edges of the first water guide plate and the edges of the second water guide plate are set as the first hydrophilic regions.

[0025] In the above technical solution, by setting the edges of the first water guide plate and the second water guide plate as the first hydrophilic regions with relatively large hydrophilicity, the edges of the first water guide plate and the second water guide plate generally come into contact with the droplets on the corresponding side walls first, which is beneficial to the rapid rupture of the droplets.

[0026] In a second aspect, an embodiment of the present application provides a fuel cell single body, which includes the electrode plate according to any one of the first aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0028] Figure 1 A side view of a fuel cell single body provided by an embodiment of the present application;

[0029] Figure 2 For Figure 1 Partial enlarged view;

[0030] Figure 3 A front view of a fuel cell single body provided by an embodiment of the present application;

[0031] Figure 4 For Figure 3 Partial enlarged view;

[0032] Figure 5 A top view of the electrode plate provided by an embodiment of the present application;

[0033] Figure 6 For Figure 5 Partial enlarged view;

[0034] Figure 7 A front view of the flow guiding member provided by another embodiment of the present application;

[0035] Figure 8 A front view of the flow guiding member provided by still another embodiment of the present application;

[0036] Figure 9 A schematic diagram of the stamping process of the flow guiding member provided by an embodiment of the present application;

[0037] Figure 10 A schematic diagram of the folding process of the first part and the third part of the air guide plate provided by an embodiment of the present application.

[0038] Icons: 1000 - fuel cell single cell; 1 - plate; 11 - plate body; 111 - flow channel; 1111 - bottom wall; 1112 - first side wall; 1113 - second side wall; 12 - flow guiding member; 121 - first water guiding plate; 1211 - first arc portion; 122 - second water guiding plate; 1221 - second arc portion; 123 - gas guiding plate; 1231 - first part; 1232 - second part; 1233 - third part; 124 - first hydrophilic region; 125 - second hydrophilic region; 126 - notch; 2 - gas diffusion layer; 3 - catalyst layer; 4 - proton exchange membrane. Detailed implementation manners

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all of the embodiments of this application. Usually, the components of the embodiments of this application described and illustrated herein can be arranged and designed in various different configurations.

[0040] A fuel cell is a chemical device that directly converts the chemical energy of a fuel into electrical energy. A fuel cell generally includes multiple fuel cell single cells, current collectors, and end plates. Electrochemical reactions occur in the fuel cell single cells to generate current. The multiple fuel cell single cells are stacked in sequence. The current collectors are used to collect the current generated by the multiple fuel cell single cells. The number of end plates is two. The two end plates cooperate and are fixedly connected through anchor members to connect functional components such as the multiple fuel cell single cells and current collectors into an integrated body.

[0041] Dozens or hundreds of flow channels are respectively provided on the anode plate and the cathode plate of the fuel cell single cell, and their function is to provide reaction gases (such as hydrogen or air) for the electrochemical reaction. In the electrochemical reaction, water is generated in the catalyst layer on the cathode side. Most of the water needs to be discharged with the gas from the flow channels of the cathode plate. A small part of the water may pass through the proton exchange membrane and enter the anode side, and be discharged with the gas from the flow channels of the anode plate.

[0042] In some cases, part of the water in the fuel cell single cell will condense into liquid. During the process of the liquid water flowing from the catalyst layer and the diffusion layer towards the flow channel, it is easy to condense into droplets on the surface of the diffusion layer and the side wall of the flow channel, affecting gas diffusion. And after a large amount of liquid water condenses and then drips, it is easy to cause the flow channel to drain insufficiently, resulting in a flooding phenomenon, causing the gas flow rate to decrease. The decrease in gas flow rate and poor diffusion will in turn lead to poor drainage, forming a vicious cycle, seriously affecting the performance of the battery.

[0043] This application provides a plate and a fuel cell single cell having the plate to alleviate the problem of liquid water condensation and improve the drainage efficiency.

[0044] Figure 1 is a side view of the fuel cell single cell 1000, Figure 2 is Figure 1 a partial cross-sectional view of Figure 2 showing a side view of the flow channel 111, Figure 3 is a front view of the fuel cell single cell 1000, Figure 4 is Figure 3 a partial cross-sectional view of Figure 4 showing a front view of the flow channel 111. As shown in combination with Figures 1-4 the fuel cell single cell 1000 includes two electrode plates 1, two gas diffusion layers 2 and a proton exchange membrane 4. The two gas diffusion layers 2 are arranged between the two electrode plates 1, and the proton exchange membrane 4 is arranged between the two gas diffusion layers 2.

[0045] In this application, the electrode plate 1 mentioned can be an anode plate, a cathode plate, or a bipolar plate formed by combining a cathode plate and an anode plate.

[0046] Figure 5 shows a top schematic view of the electrode plate 1. The electrode plate 1 includes an electrode plate body 11 and a flow guiding member 12.

[0047] The electrode plate body 11 is provided with a flow channel 111. Figure 6 is Figure 5 a partial enlarged view of Figure 6 showing a top view of the flow channel 111. As shown in combination with Figure 4 and Figure 6 the flow channel 111 includes a bottom wall 1111, a first side wall 1112 and a second side wall 1113. The first side wall 1112 is arranged on one side of the bottom wall 1111, and the second side wall 1113 is arranged on the other side of the bottom wall 1111.

[0048] The flow guiding member 12 is arranged in the flow channel 111. The flow guiding member 12 includes a first water guiding plate 121, a second water guiding plate 122 and a plurality of gas guiding plates 123.

[0049] Both the first water guiding plate 121 and the second water guiding plate 122 extend along the length direction of the flow channel 111. The first water guiding plate 121 is close to the first side wall 1112, and the second water guiding plate 122 is close to the second side wall 1113. One side plate surface of the first water guiding plate 121 faces the bottom wall 1111, and the other side plate surface faces the diffusion layer. The same is true for the second water guiding plate 122.

[0050] A plurality of gas guiding plates 123 are arranged at intervals between the first water guiding plate 121 and the second water guiding plate 122. One end of each gas guiding plate 123 is close to the bottom wall 1111, and the other end is inclined towards the outlet of the flow channel 111. The two side edges of each gas guiding plate 123 are respectively connected to the first water guiding plate 121 and the second water guiding plate 122.

[0051] Through the cooperation of the first water guide plate 121, the second water guide plate 122 and multiple air guide plates 123, the multiple air guide plates 123 respectively guide the gas flow to the diffusion layer. On the one hand, it enhances convection and improves the gas diffusion effect. On the other hand, it can also blow the liquid water on the surface of the diffusion layer to both sides, reducing the surface area of the diffusion layer covered by droplets, so that the liquid water mainly condenses at the interface between the diffusion layer and the side wall of the flow channel 111. When the liquid water condenses into droplets, it will touch the plate surface of the first water guide plate 121 or the plate surface of the second water guide plate 122, and the droplets will break and drain away through the hydrophilic effect of the plate surface, thereby reducing the volume of the droplets and accelerating the drainage efficiency.

[0052] Along the extension direction of the flow channel 111, the flow channel 111 includes a first section and a second section. The inlet of the flow channel 111 is arranged in the first section, and the outlet of the flow channel 111 is arranged in the second section. The gas first flows through the first section and then through the second section, and the water generated in the electrochemical reaction is discharged from the outlet of the flow channel 111 after passing through the second section.

[0053] Among them, the flow guiding member 12 is at least arranged in the second section. "At least the second section is provided with the flow guiding member 12" means that only the second section is provided with the flow guiding member 12, or both the first section and the second section are provided with the flow guiding member 12. In some embodiments, the flow channel 111 may further include a third section, a fourth section, etc. located between the first section and the second section. Among them, the third section and / or the fourth section may also be provided with the flow guiding member 12.

[0054] Since the gas in the second section is relatively less than that in the first section, the gas flow rate is likely to decrease, and the purging force of the gas decreases; and the water in the first section also needs to be discharged after passing through the second section, so the water volume in the second section is relatively larger. Therefore, the second section is relatively more likely to have a waterlogging problem. By arranging the flow guiding member 12 in the second section, reducing the droplet volume in the second section and improving the drainage efficiency, the waterlogging problem can be effectively alleviated and the vicious cycle can be avoided.

[0055] As Figure 6 shown, in some embodiments, the surface of the first water guide plate 121 facing away from the bottom wall 1111 and the surface of the second water guide plate 122 facing away from the bottom wall 1111 both have a plurality of first hydrophilic regions 124 and a plurality of second hydrophilic regions 125. Each first hydrophilic region 124 and each second hydrophilic region 125 extend along the length direction of the flow channel 111, and the plurality of first hydrophilic regions 124 and the plurality of second hydrophilic regions 125 are alternately arranged, and the hydrophilicity of the first hydrophilic region 124 is greater than that of the second hydrophilic region 125.

[0056] The flow guiding member 12 can be made of a corrosion-resistant hydrophilic metal thin plate. By polishing, oxidizing or scribing the surface of the metal thin plate, etc., the hydrophilicity of the local area is increased, thereby forming the first hydrophilic region 124.

[0057] Due to the different hydrophilicities of the first hydrophilic region 124 and the second hydrophilic region 125, when the droplet contacts the plate surface, the contact angle between the droplet and the first hydrophilic region 124 is different from the contact angle between the droplet and the second hydrophilic region 125, and the droplet is more likely to break. After the droplet breaks, a part of it flows away along the first hydrophilic region 124 and another part flows away along the second hydrophilic region 125.

[0058] Since the width of the flow channel 111 of the electrode plate 1 is small, and the widths of the first water guide plate 121 and the second water guide plate 122 are only a few millimeters, the width of each hydrophilic region is also small, enabling the hydrophilic region to have a capillary action to guide the rapid drainage of liquid water.

[0059] Among them, at least the edges of the first water guide plate 121 and the second water guide plate 122 are set as the first hydrophilic region 124. The edges of the first water guide plate 121 and the second water guide plate 122 generally contact the droplets on the corresponding side walls first. By setting the edges of the first water guide plate 121 and the second water guide plate 122 as the first hydrophilic region 124 with relatively large hydrophilicity, it is beneficial for the droplets to break quickly.

[0060] The flow guiding member 12 is fixed in the flow channel 111 through the first water guide plate 121 and / or the second water guide plate 122. That is, the first water guide plate 121 is fixed to the first side wall 1112, or the second water guide plate 122 is fixed to the second side wall 1113, or the first water guide plate 121 is fixed to the first side wall 1112 and the second water guide plate 122 is fixed to the second side wall 1113.

[0061] There are various ways to fix the first water guide plate 121 to the first side wall 1112 and the second water guide plate 122 to the second side wall 1113, such as welding, bonding, fitting, etc., and the fixing methods of the first water guide plate 121 and the second water guide plate 122 can be the same or different.

[0062] In some embodiments, the flow guiding member 12 is elastically clamped in the flow channel 111 through the first water guide plate 121 and the second water guide plate 122.

[0063] As Figure 7 shown, the edge of the first water guide plate 121 bends towards the direction away from the bottom wall 1111 to form a first arc portion 1211, and the first arc portion 1211 fits on the first side wall 1112.

[0064] The edge of the second water guide plate 122 bends towards the direction away from the bottom wall 1111 to form a second arc portion 1221, and the second arc portion 1221 fits on the second side wall 1113.

[0065] When the flow guiding member 12 is installed in the flow channel 111, the first arc portion 1211 and the second arc portion 1221 play a guiding role to facilitate the smooth entry of the flow guiding member 12 into the flow channel 111.

[0066] After the flow guiding member 12 enters the flow channel 111, the first side wall 1112 presses against the first arc portion 1211, and the second side wall 1113 presses against the second arc portion 1221, so that the first arc portion 1211 fits against the first side wall 1112, and the second arc portion 1221 fits against the second side wall 1113, thereby elastically clamping the flow guiding member 12 in the flow channel 111.

[0067] During installation, by adjusting the degree of pressing down the flow guiding member 12, the installation position of the flow guiding member 12 can be adjusted.

[0068] Exemplarily, the installation height of the flow guiding member 12 is set such that the first water guiding plate 121 and the second water guiding plate 122 are closer to the diffusion layer relative to the bottom wall 1111, so that the plate surface of the first water guiding plate 121 or the plate surface of the second water guiding plate 122 can contact and break the droplets as early as possible to minimize the volume of the droplets. As Figure 4 shown, the distance between the first water guiding plate 121 and the top end of the first side wall 1112 is L1, the distance between the first water guiding plate 121 and the bottom wall 1111 is L2, the distance between the second water guiding plate 122 and the top end of the second side wall 1113 is L3, and the distance between the second water guiding plate 122 and the bottom wall 1111 is L4, where L1 < L2 and L3 < L4.

[0069] The flow guiding member 12 provided by the embodiment of the present application is applicable to flow channels 111 with various cross-sectional shapes.

[0070] For example, as Figure 7 shown, the cross-sectional shape of the flow channel 111 is rectangular, the first side wall 1112 and the second side wall 1113 are both perpendicular to the bottom wall 1111, the first arc portion 1211 abuts against the first side wall 1112, the second arc portion 1221 abuts against the second side wall 1113, and by sliding the first arc portion 1211 and the second arc portion 1221 in the vertical direction, the installation height of the flow guiding member 12 can be adjusted.

[0071] Another example, as Figure 8As shown, the cross-sectional shape of the flow channel 111 is trapezoidal. The upper end of the first side wall 1112 inclines away from the second side wall 1113, and the upper end of the second side wall 1113 inclines away from the first side wall 1112, so that the distance between the upper ends of the first side wall 1112 and the second side wall 1113 is greater than the width of the bottom wall 1111. The width of the diversion member 12 ≥ the distance between the upper ends of the first side wall 1112 and the second side wall 1113, so that the first arc portion 1211 and the second arc portion 1221 of the diversion member 12 can overlap between the upper ends of the first side wall 1112 and the second side wall 1113. If it is necessary to make the installation position of the diversion member 12 closer to the bottom wall 1111, press down the diversion member 12, and the folding angles of the first arc portion 1211 and the second arc portion 1221 can be increased, so that the first arc abuts against the inclined first side wall 1112, the second arc portion 1221 abuts against the inclined second side wall 1113, and it can be fixed at any height position.

[0072] Optionally, as Figure 9 shown, along the length direction of the diversion member 12 (i.e., along the length direction of the flow channel 111), the first arc portion 1211 and the second arc portion 1221 are respectively provided with a plurality of notches 126. By respectively arranging a plurality of notches 126 on the first arc portion 1211 and the second arc portion 1221, the contact area between the first arc portion 1211 and the first side wall 1112 is reduced, and the contact area between the second arc portion 1221 and the second side wall 1113 is reduced. When the first arc portion 1211 and the second arc portion 1221 slide along the first side wall 1112 and the second side wall 1113 under the action of an external force, the sliding friction can be reduced to avoid jamming, so as to facilitate the adjustment of the height of the diversion member 12. At the same time, after the liquid droplet breaks, part of the liquid water can flow down along the side wall of the flow channel 111 from the notch 126 to divert the liquid water on the first water guide plate 121 and the second water guide plate 122 to avoid waterlogging.

[0073] In some embodiments, each air guide plate 123 is spaced from the bottom wall 1111, so that a gap can be formed between the air guide plate 123 and the bottom wall 1111, and this gap allows water flow and air flow to pass through. Since the flow area of the flow channel 111 at the gap is reduced, the gas accelerates when flowing through the gap, and a relatively high-speed air flow is formed on the surface of the bottom wall 1111. The high-speed air flow can quickly carry away the liquid water on the surface of the bottom wall 1111, thereby further improving the drainage efficiency and avoiding waterlogging.

[0074] In the embodiments where the installation height of the adjustable diversion member 12 can be adjusted, by spacing the air guide plate 123 from the bottom wall 1111 to form a gap, this gap also provides an adjustment margin in the height direction of the flow channel 111, so as to facilitate the adjustment of the height of the diversion member 12.

[0075] As Figure 9As shown, each air guide plate 123 includes a first part 1231, a second part 1232, and a third part 1233. The first part 1231, the second part 1232, and the third part 1233 are connected in sequence. The two side edges of the second part 1232 are connected to the first water guide plate 121 and the second water guide plate 122.

[0076] The flow guiding member 12 is formed by integral stamping. During manufacturing, stamping is performed on a thin plate, and the parts other than the first water guide plate 121, the second water guide plate 122, and the air guide plate 123 are removed, so that the two sides of the first part 1231 are separated from the first water guide plate 121 and the second water guide plate 122 respectively, and the two sides of the third part 1233 are separated from the first water guide plate 121 and the second water guide plate 122 respectively. Then, as Figure 10 shown, the first part 1231 is folded upward, and the third part 1233 is folded downward to form the air guide plate 123.

[0077] The slope of the first part 1231 and the slope of the second part 1232 can be flexibly set according to needs, so that the flow guiding member 12 can meet different requirements. For example, when the installation position of the flow guiding member 12 is relatively closer to the diffusion layer: reduce the folding angle of the first part 1231 to prevent the upper end of the first part 1231 from exceeding the upper ends of the first side wall 1112 and the second side wall 1113, and avoid the corners of the first part 1231 from piercing the diffusion layer and the proton exchange membrane 4; at the same time, increase the folding angle of the second part 1232 so that the edge of the second part 1232 is as close as possible to the bottom wall 1111. On the one hand, it is convenient to block and guide the airflow towards the diffusion layer, and on the other hand, it is convenient to form a gap between the second part 1232 and the bottom wall 1111, so as to achieve the purpose of accelerating the airflow and water flow on the surface of the bottom wall 1111.

[0078] The integrally stamped flow guiding member 12 eliminates the assembly steps. During installation, it can be placed as a whole into the flow channel. The installation steps are simple, and the manufacturing cost is relatively low.

[0079] In the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not detailed in a certain embodiment, reference can be made to the detailed descriptions of other embodiments above, and they will not be elaborated here.

[0080] At the same time, specific terms are used in this application to describe the embodiments of this application. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0081] Similarly, it should be noted that, in order to simplify the description disclosed in the present application and thus help the understanding of one or more embodiments, in the foregoing description of the embodiments of the present application, sometimes multiple features are incorporated into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the subject matter of the present application are more than those mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0082] It should be noted that like reference numerals and letters in the drawings of the present application denote like items, and thus, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0083] In the description of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed during use, it is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present application. In addition, in the description of the present application, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they cannot be construed as indicating or implying relative importance.

[0084] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "coupled" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0085] For each patent, patent application, patent application publication, and other materials cited in the present application, such as articles, books, specifications, publications, documents, etc., their entire contents are hereby incorporated into the present application by reference, except for the application history documents that are inconsistent with or conflict with the content of the present application, and also except for the documents that limit the broadest scope of the claims of the present application (currently or subsequently attached to the present application). It should be noted that if there are inconsistencies or conflicts between the descriptions, definitions, and / or uses of terms in the supplementary materials of the present application and the content described in the present application, the descriptions, definitions, and / or uses of terms in the present application shall prevail.

Claims

1. A plate, characterized in that, Comprising: A plate body provided with a flow channel, the flow channel including a bottom wall, a first side wall, and a second side wall, the first side wall and the second side wall being oppositely arranged on both sides of the bottom wall; A flow guiding member disposed in the flow channel, the flow guiding member including a first water guiding plate, a second water guiding plate, and a plurality of air guiding plates, the first water guiding plate and the second water guiding plate both extending along the length direction of the flow channel, the plurality of air guiding plates being spaced between the first water guiding plate and the second water guiding plate, one end of each air guiding plate being close to the bottom wall and the other end being inclined towards the outlet of the flow channel, the first water guiding plate being disposed close to the first side wall to reduce the volume of water droplets on the first side wall, and the second water guiding plate being disposed close to the second side wall to reduce the volume of water droplets on the second side wall; both the side of the first water guiding plate facing away from the bottom wall and the side of the second water guiding plate facing away from the bottom wall have a first hydrophilic region and a second hydrophilic region, both the first hydrophilic region and the second hydrophilic region extending along the length direction of the flow channel, and the hydrophilicity of the first hydrophilic region being greater than that of the second hydrophilic region.

2. The plate according to claim 1, characterized in that, The distance between the first water guiding plate and the top end of the first side wall is less than the distance between the first water guiding plate and the bottom wall, and the distance between the second water guiding plate and the top end of the second side wall is less than the distance between the second water guiding plate and the bottom wall.

3. The electrode plate according to claim 1, wherein, The first water guiding plate is fixed to the first side wall and / or the second water guiding plate is fixed to the second side wall, and each air guiding plate is spaced from the bottom wall.

4. The electrode plate according to claim 1, wherein The edge of the first water guiding plate is bent towards the direction away from the bottom wall to form a first arc portion, and the first arc portion fits against the first side wall; The edge of the second water guiding plate is bent towards the direction away from the bottom wall to form a second arc portion, and the second arc portion fits against the second side wall.

5. The plate according to claim 4, wherein Along the length direction of the flow channel, the first arc portion and the second arc portion are respectively provided with a plurality of notches.

6. The plate according to claim 1, wherein Each air guiding plate includes a first portion, a second portion, and a third portion connected in sequence, the second portion being connected to the first water guiding plate and the second water guiding plate, and the first water guiding plate, the second water guiding plate, and the plurality of air guiding plates are integrally stamped.

7. The plate according to claim 1, characterized in that, The flow channel includes a first section and a second section, the inlet of the flow channel is provided in the first section, the outlet of the flow channel is provided in the second section, and the flow guiding member is at least provided in the second section.

8. The plate according to claim 1, characterized in that, Both the side of the first water guiding plate facing away from the bottom wall and the side of the second water guiding plate facing away from the bottom wall have a plurality of the first hydrophilic regions and a plurality of the second hydrophilic regions, and the plurality of the first hydrophilic regions and the plurality of the second hydrophilic regions are alternately arranged.

9. The plate according to claim 8, wherein At least the edges of the first water guiding plate and the second water guiding plate are set as the first hydrophilic regions.

10. A fuel cell single cell, characterized in that, Including the plate as described in any one of claims 1-9.

Images