Plate and fuel cell unit

Abstract

The present application specifically relates to a bipolar plate and a fuel cell single cell. The bipolar plate includes: a bipolar plate body, on one side facing the gas diffusion layer, a gas flow channel is provided; a separator, which is arranged at intervals in the gas flow channel along the extension direction of the gas flow channel, each separator is provided with a through hole allowing gas to pass through, and the through holes of two adjacent separators are staggered. When the gas flows towards the separator, a part of the gas diffuses towards the gas diffusion layer under the blocking and guiding of the separator, and another part of the gas is accelerated through the through hole to form an entrainment effect, and then the high-speed gas flow is blocked by the next separator and the gas flow is guided to diffuse. The cooperation of multiple separators continuously accelerates the gas flow, blocks the high-speed gas flow to form a laminar flow, and promotes the gas to diffuse outside the gas flow channel in the gas flow direction, forming a virtuous cycle, so that a relatively fast gas flow rate exists along the entire gas flow channel, the gas distribution is uniform, local gas shortage is avoided, and the mass transfer ability is good.

Description

Technical Field

[0001] This 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 gas 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. During operation, it is necessary to make the reaction gases diffuse and transfer outside the gas flow channels to supply the electrochemical reaction. However, after the reaction gases participate in the electrochemical reaction and are consumed, the gas flow rate will gradually decrease, thereby weakening the convection and causing a phenomenon of local gas shortage, resulting in a reduction in mass transfer ability. The mass transfer ability is related to the performance and stability of the fuel cell. How to ensure a good diffusion effect and a high flow rate to ensure the mass transfer ability of the fuel cell single cell is an important research direction in this field. Summary of the Invention

[0003] This application aims to provide a bipolar plate and a fuel cell single cell to improve the mass transfer ability.

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

[0005] In a first aspect, an embodiment of this application provides a bipolar plate for a fuel cell single cell. The fuel cell single cell includes a gas diffusion layer, and the gas diffusion layer and the bipolar plate are stacked. The bipolar plate includes:

[0006] A bipolar plate body, on one side facing the gas diffusion layer, is provided with gas flow channels;

[0007] Partition plates, which are arranged at intervals in the gas flow channels along the extension direction of the gas flow channels. Each partition plate is provided with through holes that allow gases to pass through, and the through holes of two adjacent partition plates are staggered.

[0008] The electrode plate provided by the present application is configured by arranging a plurality of partitions with through holes at intervals in the gas flow channel. When the gas flows towards each partition, a part of the gas diffuses towards the gas diffusion layer under the blockage and guidance of the partition, and the other part of the gas flows backward through the through holes. Since the flow area at the through holes is relatively small, the gas velocity increases when passing through the through holes, forming an entrainment effect. The high-speed gas flow generated at the through holes drives the surrounding low-speed gas flow to flow together, alleviating the problem of gas velocity reduction caused by gas consumption, so as to prevent the mass transfer capacity in the second half of the gas flow channel from decreasing due to the velocity reduction. At the same time, the through holes of two adjacent partitions are staggered to prevent the high-speed gas flow from directly passing through the through holes of the two partitions to form a laminar flow, resulting in weakened convection. In the technical solution of the present application, by promoting the gas to diffuse out of the gas flow channel on one side of the partition and attracting the surrounding low-speed gas flow on the other side, not only can the convection decline caused by the gas velocity reduction be avoided, but also the gas convection can be further enhanced; the cooperation of multiple partitions accelerates the gas flow continuously in the gas flow direction, prevents the high-speed gas flow from forming a laminar flow, and continuously promotes the gas to diffuse out of the gas flow channel, forming a virtuous cycle, so that a relatively fast gas velocity is maintained along the entire gas flow channel, the gas distribution is uniform, local gas shortage is avoided, and the mass transfer capacity is good.

[0009] In some embodiments of the present application, the gas flow channel includes a first section and a second section. The inlet of the gas flow channel is provided at the first section, and the outlet of the gas flow channel is provided at the second section. At least the second section is provided with the partition.

[0010] Since the gas first flows through the first section, the first section has a relatively sufficient gas supply for the electrochemical reaction. Then, the gas after the reaction consumption flows through the second section. The gas in the second section is relatively less than that in the first section, and it is easy to occur the phenomenon that the gas velocity decreases and the gas concentration decreases, resulting in the reduction of the mass transfer capacity. And due to the reduction of the gas velocity in the second section, it is also easy to occur the situation of water accumulation, leading to a vicious cycle of further reduction of the gas velocity. In the above technical solution, by arranging the partition in the second section to increase the gas velocity, enhance the convection and diffusion, the gas velocity in the second section is increased to make the gas distribution more uniform, and the water accumulation is prevented, effectively improving the mass transfer capacity at the position of the second section. The mass transfer capacity of the gas flow channel in the first section and the second section is relatively balanced, and the performance and stability of the fuel cell are good.

[0011] In some embodiments of the present application, the through holes on two adjacent partitions are staggered in the height direction of the gas flow channel.

[0012] In the above technical solution, the through holes of two adjacent partitions are staggered in the height direction of the gas flow channel, which can prevent the gas from directly passing through the through holes of the two partitions to form a laminar flow, so as not to affect the gas diffusion.

[0013] In some embodiments of the present application, the through holes on two adjacent partitions are staggered in the width direction of the gas flow channel.

[0014] In the above technical solution, the through holes of two adjacent partitions are staggered in the width direction of the gas flow channel, disturbing the low-speed gas flow at different positions in the width direction of the gas flow channel, making the gas distribution more uniform.

[0015] In some embodiments of the present application, at least two through holes are provided on each partition, and the at least two through holes are arranged at intervals.

[0016] Compared with the technical solution of setting one through hole on the partition, in the technical solution of arranging multiple through holes at intervals on the partition, under the condition of the same flow area, the flow area of a single through hole is reduced, which can further increase the gas flow rate, and the positions of the multiple through holes are scattered, which can more fully disturb the surrounding low-speed gas, improving the acceleration effect and diffusion effect.

[0017] In some embodiments of the present application, the gas flow channel includes a bottom wall, a first side wall and a second side wall, and the first side wall and the second side wall are oppositely arranged on both sides of the bottom wall;

[0018] One end of the partition is close to the bottom wall, and the other end of the partition extends away from the bottom wall and is inclined towards the outlet direction of the gas flow channel.

[0019] In the above technical solution, by setting the end of the partition away from the bottom wall to be inclined towards the outlet direction, it is beneficial to guide the gas flow towards the gas diffusion layer.

[0020] In some embodiments of the present application, the partition is connected to the first side wall and / or the second side wall, and is spaced from the bottom wall to form a gap.

[0021] In the above technical solution, the partition is connected to the first side wall and / or the second side wall for fixation, so that a gap can be formed between the partition and the bottom wall. When the gas flows through the gap, it accelerates, so that the gas flow rate on the surface of the bottom wall is increased, and the liquid water on the surface of the bottom wall can be quickly blown away, so as to avoid the increase of flow resistance caused by water accumulation in the gas flow channel, thereby avoiding the reduction of gas flow rate and mass transfer capacity.

[0022] In some embodiments of the present application, the height of the partition is not lower than the height of the gas flow channel.

[0023] In the above technical solution, the partition plate is flush with the side wall of the gas flow channel, or the partition plate extends beyond the side wall of the gas flow channel, so that the gas needs to cross the partition plate and pass through the gas diffusion layer before flowing forward, ensuring a good diffusion effect; moreover, the formation of a gap between the partition plate and the gas diffusion layer is avoided, so as to prevent the gas from accelerating through the gap between the partition plate and the gas diffusion layer, forming an air flow barrier that hinders gas diffusion.

[0024] In some embodiments of the present application, the electrode plate is provided with a plurality of gas flow channels, and the positions of the partition plates in adjacent two gas flow channels are staggered.

[0025] In the above technical solution, the positions of the partition plates in adjacent two gas flow channels are staggered, making the gas distribution in the entire electrode plate flow field more uniform.

[0026] In a second aspect, an embodiment of the present application further provides a fuel cell single cell, which includes:

[0027] The electrode plate according to any one of the first aspect, and the number of the electrode plates is two;

[0028] A gas diffusion layer, the number of the gas diffusion layers is two, and the two gas diffusion layers are arranged between the two electrode plates;

[0029] A proton exchange membrane, which is arranged between the two gas diffusion layers, and catalyst layers are covered on both side surfaces of the proton exchange membrane.

[0030] The fuel cell single cell provided by the present application has good mass transfer ability due to the aforementioned electrode plate, and the performance and stability of the fuel cell are good. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used 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 limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a side view of a fuel cell single cell provided by an embodiment of the present application;

[0033] Figure 2 For Figure 1 is a partial enlarged view of;

[0034] Figure 3 It is a front view of a fuel cell single cell provided by an embodiment of the present application;

[0035] Figure 4 For Figure 3 is a partial enlarged view of;

[0036] Figure 5 The top view of the electrode plate provided by an embodiment of the present application;

[0037] Figure 6 A schematic diagram of an arrangement of two through holes of the separator provided by an embodiment of the present application;

[0038] Figure 7 Another schematic diagram of an arrangement of two through holes of the separator provided by an embodiment of the present application;

[0039] Figure 8 Another schematic diagram of an arrangement of two through holes of the separator provided by an embodiment of the present application;

[0040] Figure 9 Another schematic diagram of an arrangement of two through holes of the separator provided by an embodiment of the present application;

[0041] Figure 10 Another schematic diagram of an arrangement of two through holes of the separator provided by an embodiment of the present application;

[0042] Figure 11 A schematic diagram of an arrangement of three through holes of the separator provided by an embodiment of the present application;

[0043] Figure 12 Another schematic diagram of an arrangement of three through holes of the separator provided by an embodiment of the present application;

[0044] Figure 13 The top view of the electrode plate provided by another embodiment of the present application.

[0045] Icon: 1000 - fuel cell unit, 1 - electrode plate, 11 - electrode plate body, 111 - gas flow channel, 1111 - first section, 1112 - second section, 1113 - bottom wall, 1114 - first side wall, 1115 - second side wall, 12 - separator, 121 - through hole, 13 - gap, 2 - gas diffusion layer, 3 - catalyst layer, 4 - proton exchange membrane. Detailed implementation manners

[0046] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0047] 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 monomers, current collectors, and end plates. Electrochemical reactions occur in the fuel cell monomers to generate current. The multiple fuel cell monomers are stacked in sequence. The current collectors are used to collect the current generated by the multiple fuel cell monomers. The number of end plates is two, and the two end plates cooperate and are fixedly connected through anchor members to connect functional components such as the multiple fuel cell monomers and current collectors into one body.

[0048] Sometimes, fuel cells have problems with poor performance and stability. After research, it is found that the mass transfer ability of the fuel cell monomers decreases, resulting in poor performance and stability of the fuel cells.

[0049] A fuel cell monomer includes a cathode plate, an anode plate, two gas diffusion layers, two catalyst layers, and a proton exchange membrane. The cathode plate and the anode plate are respectively arranged on both sides of the proton exchange membrane. A catalyst layer and a gas diffusion layer are respectively arranged between the cathode plate and the proton exchange membrane and between the anode plate and the proton exchange membrane. Dozens or hundreds of gas flow channels are respectively provided on the cathode plate and the anode plate. Reaction gases (such as hydrogen or air) are input through the gas flow channels. The gases diffuse outward from the gas flow channels and are evenly distributed on the surface of the catalyst layer through the gas diffusion layers to supply the electrochemical reactions.

[0050] However, after the gases participate in the electrochemical reactions and are consumed, the gas flow rate in the latter section of the gas flow channels gradually decreases, and the convection weakens, resulting in uneven distribution of the gases in the gas diffusion layers and the phenomenon of local gas shortage, thereby leading to a decrease in the mass transfer ability. Therefore, how to balance better diffusion effects and higher flow rates to ensure the mass transfer ability of fuel cell monomers is an important research direction in this field.

[0051] This application provides a plate and a fuel cell monomer having the plate, which are used to ensure better diffusion effects and higher flow rates, so as to improve the mass transfer ability and ensure the performance and stability of the fuel cells.

[0052] Figure 1 is a side view of the fuel cell monomer 1000, Figure 2 is Figure 1 a partial cross-sectional view of Figure 2 showing a side view of the gas flow channel 111, Figure 3 is a front view of the fuel cell, Figure 4 is Figure 3 a partial cross-sectional view of Figure 4 showing a front view of the gas flow channel 111. As shown in combination with Figures 1-4 the fuel cell monomer 1000 includes two plates 1, two gas diffusion layers 2, and a proton exchange membrane 4. The two gas diffusion layers 2 are arranged between the two plates 1, and the proton exchange membrane 4 is arranged between the two gas diffusion layers 2.

[0053] Figure 5 is a top view of the electrode plate 1. In combination with Figure 2 , Figure 4 and Figure 5 as shown, the electrode plate 1 includes an electrode plate body 11 and a plurality of partition plates 12. A gas flow channel 111 is provided on the surface of the electrode plate body 11 facing the gas diffusion layer 2. The plurality of partition plates 12 are arranged at intervals in the gas flow channel 111 along the extending direction of the gas flow channel 111. Through holes 121 allowing gas to pass through are respectively provided on each partition plate 12, and the through holes 121 on two adjacent partition plates 12 are staggered.

[0054] Figure 3 The approximate flow direction of the gas is indicated by the arrowed lines in

[0055] . When the gas flows along the gas flow channel 111, a part of the gas diffuses towards the gas diffusion layer 2 under the blockage and guidance of the partition plate 12, and the other part of the gas continues to flow through the through hole 121. Since the flow area at the through hole 121 is small, the flow velocity of the gas increases when passing through the through hole 121 and an entrainment effect is formed. The high-speed gas flow generated at the through hole 121 drives the surrounding low-speed gas flow to flow together, alleviating the problem of the reduction of the gas flow velocity caused by gas consumption, so as to prevent the reduction of the mass transfer capacity in the latter half of the gas flow channel 111. Moreover, by promoting the diffusion of the gas out of the gas flow channel 111 on one hand and attracting the surrounding low-speed gas flow on the other hand, the gas convection can be further enhanced.

[0056] Thus, in the gas flow direction, the plurality of partition plates 12 cooperate to continuously accelerate the gas flow, block the high-speed gas flow to prevent the formation of laminar flow, and continuously promote the gas to diffuse out of the gas flow channel 111. A virtuous cycle is formed, so that there is strong convection along the gas flow channel 111, the gas distribution is more uniform, the mass transfer capacity is better, and the battery stability is better.

[0057] As Figure 5 shown, along the extending direction of the gas flow channel 111, the gas flow channel 111 includes a first section 1111 and a second section 1112. The inlet of the gas flow channel 111 is arranged at the first section 1111, the outlet of the gas flow channel 111 is arranged at the second section 1112, and at least the second section 1112 is provided with the partition plate 12.

[0058] Since the gas first flows through the first section 1111, there is relatively sufficient gas in the first section 1111 to supply the electrochemical reaction. Then, the gas consumed by the reaction in the first section 1111 flows through the second section 1112. The gas in the second section 1112 is reduced relative to the first section 1111, and the phenomenon of reduced gas flow rate and reduced gas concentration leading to reduced mass transfer capacity is likely to occur. By arranging the partition 12 in the second section 1112, the gas flow rate in the second section 1112 is increased, and the convection and diffusion of the gas in the second section 1112 are enhanced, so that the gas distribution in the gas diffusion layer 2 near the second section 1112 is more uniform, and the mass transfer capacity at the position of the second section 1112 is effectively improved. The mass transfer capacity of the gas flow channel 111 in the first section 1111 and the second section 1112 is relatively balanced, so that the performance and stability of the fuel cell are better.

[0059] “At least the second section 1112 is provided with a partition 12” means that the second section 1112 is provided with a partition 12, and the first section 1111 may also be provided with a partition 12. It can be understood that, in some embodiments, the gas flow channel 111 may also include a third section, a fourth section, etc. located between the first section 1111 and the second section 1112, wherein the third section and / or the fourth section may also be provided with a partition 12.

[0060] In some embodiments, each partition 12 is provided with at least two through holes 121 , and the at least two through holes 121 are arranged at intervals.

[0061] Figure 6 A situation in which two through holes 121 are provided on the partition 12 is shown. Under the condition of equal flow area, compared with the technical solution of providing one through hole 121 on the partition 12, in the technical solution of providing two through holes 121 on the partition 12, the flow area of a single through hole 121 is smaller, which can further increase the gas flow rate, and the positions of the two through holes 121 are dispersed, which can more fully disturb the surrounding low-speed gas and improve the acceleration effect and diffusion effect.

[0062] In some embodiments, please continue to see Figure 2 The through holes 121 on two adjacent partitions 12 are staggered in the height direction of the gas flow channel 111 .

[0063] For example, Figure 6 As shown, the two through holes 121 on the partition 12 are located in the middle and upper part of the partition 12, and the adjacent partitions 12 can be as shown in FIG. Figure 7 As shown, two through holes 121 are arranged in the middle and lower part of the partition 12, so that the through holes 121 of two adjacent partitions 12 are staggered in the height direction of the gas flow channel 111 to avoid the gas directly passing through the through holes 121 of the two partitions 12 to form laminar flow, so as not to affect gas diffusion.

[0064] Figure 8 Another schematic diagram showing the arrangement of two through holes 121 of the partition 12 is shown. The two through holes 121 are arranged at intervals along a diagonal line of the partition 12, and the through holes 121 on the adjacent partition 12 can be Figure 9 As shown, they are arranged at intervals along the other diagonal line of the partition 12, so that the through holes 121 of two adjacent partitions 12 are staggered in the height direction of the gas flow channel 111, playing a role in preventing gas from directly passing through the through holes 121 of the two partitions 12.

[0065] In some other embodiments, the through holes 121 on two adjacent partitions 12 can also be arranged to be staggered in the width direction of the gas flow channel 111. For example, the through holes 121 on one partition 12 are located on the left side of the symmetric center line of the partition 12, and the through holes 121 on the adjacent partition 12 are located on the right side of the symmetric center line of the partition 12. Another example is as Figure 6 shown, the distance between the two through holes 121 on the partition 12 is L1, and the arrangement of the through holes 121 on the adjacent partition 12 is as Figure 10 shown, the distance between the two through holes 121 is L2, and L1 > L2. By staggering the through holes 121 of two adjacent partitions 12 in the width direction of the gas flow channel 111, the low-speed airflow is disturbed at different positions in the width direction of the gas flow channel 111, making the gas distribution in the gas diffusion layer 2 more uniform.

[0066] The "at least two through holes 121" mentioned in this application means that the number of through holes 121 is two or more. For example, each partition 12 has three through holes 121. As Figure 11 shown, there are two through holes 121 in the upper middle part of the partition 12 and one through hole 121 in the lower middle part of the partition 12. The adjacent partition 12 can be provided with two through holes 121, three through holes 121, four through holes 121... etc. Exemplarily, as Figure 12 shown, the adjacent partition 12 is provided with three through holes 121, one through hole 121 in the upper middle part of the partition 12 and two through holes 121 in the lower middle part of the partition 12, so that the positions of the through holes 121 on the two partitions 12 are staggered.

[0067] Please refer to Figure 2 and Figure 4 shown, the gas flow channel 111 includes a bottom wall 1113, a first side wall 1114 and a second side wall 1115. The first side wall 1114 and the second side wall 1115 are oppositely arranged on both sides of the bottom wall 1113.

[0068] One end of the partition plate 12 is close to the bottom wall 1113, and the other end of the partition plate 12 extends away from the bottom wall 1113 and is inclined towards the outlet direction of the gas flow channel 111. By setting the end of the partition plate 12 away from the bottom wall 1113 to be inclined towards the outlet direction, it is beneficial to guide the gas flow towards the gas diffusion layer 2.

[0069] In some embodiments, the height of the partition plate 12 is not lower than the height of the gas flow channel 111. The height of the gas flow channel 111 is the height of the first side wall 1114 and the second side wall 1115. The height of the partition plate 12 not being lower than the height of the gas flow channel 111 means that the partition plate 12 is flush with the first side wall 1114 and the second side wall 1115, or the partition plate 12 extends beyond the first side wall 1114 and the second side wall 1115. As shown in combination Figure 2 The gas in the gas flow channel 111 is blocked by the partition plate 12. Under the guidance of the partition plate 12, the gas needs to cross the partition plate 12 when flowing forward, thereby guiding the gas to the gas diffusion layer 2, achieving a good guiding effect and diffusion effect.

[0070] In addition, since the height of the partition plate 12 is not lower than the height of the gas flow channel 111, when the gas diffusion layer 2 and the electrode plate 1 are stacked, the partition plate 12 is in close contact with the gas diffusion layer 2, avoiding the formation of a gap 13 between the partition plate 12 and the gas diffusion layer 2, so as to prevent the gas from accelerating through the gap 13 between the partition plate 12 and the gas diffusion layer 2, thereby avoiding the formation of an air flow barrier on the surface of the gas diffusion layer 2. The air flow barrier will block the gas convection between the gas diffusion layer 2 and the gas in the gas flow channel 111, resulting in difficulty for the gas in the gas flow channel 111 to diffuse to the gas diffusion layer 2, and the mass transfer ability is greatly reduced.

[0071] In the embodiments of the present application, the electrode plate 1 mentioned can be the cathode plate 1 or the anode plate 1.

[0072] The fixing method of the partition plate 12 can be fixedly connected to at least one of the bottom wall 1113, the first side wall 1114, and the second side wall 1115.

[0073] In some embodiments, the partition plate 12 is connected to the first side wall 1114 and / or the second side wall 1115, and is spaced apart from the bottom wall 1113 to form a gap 13.

[0074] In an electrochemical reaction, water is generated in the catalyst layer 3 on the cathode side. Most of the water will pass through the gas diffusion layer 2 of the cathode and reach the gas flow channel 111 of the cathode plate 1, and then be discharged from the fuel cell along with the cathode gas flow; a small amount of water may pass through the proton exchange membrane 4 and finally enter the gas flow channel 111 of the anode plate 1, and be discharged from the fuel cell along with the anode gas flow. Among them, part of the water in the gas flow channel 111 will condense into liquid state. The accumulation of liquid water in the gas flow channel 111 will increase the flow resistance of the gas, reduce the gas flow rate and the mass transfer ability. By fixedly connecting the partition plate 12 to the side wall and providing a gap 13 between the partition plate 12 and the bottom wall 1113, the gas is accelerated when flowing through the gap 13, so that the gas flow rate on the surface of the bottom wall 1113 is increased, and the liquid water on the surface of the bottom wall 1113 can be quickly blown away to prevent the gas flow channel 111 from accumulating water.

[0075] Each plate 1 is provided with a plurality of gas flow channels 111. The plurality of gas flow channels 111 are arranged side by side, and each gas flow channel 111 is provided with a plurality of partition plates 12, so that each gas flow channel 111 has a relatively high gas flow rate and strong convection, and the gas in the gas diffusion layer 2 is evenly distributed and fully flows.

[0076] As Figure 13 shown, in some embodiments, the positions of the partition plates 12 in two adjacent gas flow channels 111 are staggered.

[0077] From the perspective of a single gas flow channel 111, the gas in front of the partition plate 12 is forced by the partition plate 12 to be guided to the gas diffusion layer 2. For the convenience of understanding, the area in front of the partition plate 12 is defined as the forced diffusion area; while the area behind the partition plate 12 generates turbulence under the impact of the high-speed gas generated by the through hole 121, and the turbulence can freely diffuse towards the gas diffusion layer 2. The area behind the adjacent partition plates 12 is defined as the free diffusion area. By arranging a plurality of partition plates 12 in each gas flow channel 111, staggered forced diffusion areas and free diffusion areas are formed in each gas flow channel 111. Among them, a certain gas concentration difference is formed between the forced diffusion area and the free diffusion area.

[0078] By staggering the positions of the partition plates 12 in two adjacent gas flow channels 111, the forced diffusion areas and the free diffusion areas of the two adjacent gas flow channels 111 are staggered. That is, the forced diffusion area of one gas flow channel 111 corresponds to the free diffusion area of its adjacent gas flow channel 111, and its free diffusion area corresponds to the forced diffusion area of its adjacent gas flow channel 111. Under the action of the concentration difference, not only longitudinal convection is generated in the extending direction of a single gas flow channel 111, but also the gas between adjacent gas flow channels 111 is prone to generate transverse convection, so that the gas distribution in the entire flow field is more uniform, and dead corner areas with slower flow rates are avoided.

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

[0080] At the same time, the present application uses specific terms to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of the present 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 the present application can be appropriately combined.

[0081] Similarly, it should be noted that, in order to simplify the presentation of the disclosure of 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 merged 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 embodiment are less than all the features of the single embodiment disclosed above.

[0082] It should be noted that: similar reference numerals and letters represent similar items in the drawings of the present application. Therefore, 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. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this 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 understood 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 understood 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", "connected" 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 situations.

[0085] For each patent, patent application, patent application publication, and other materials cited in this application, such as articles, books, specifications, publications, documents, etc., the entire content thereof is hereby incorporated by reference into this application, except for application history 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 uses of terms in the attached materials of this application and the content described in this application, the descriptions, definitions, and / or uses of terms in this application shall prevail.

Claims

1. A plate for a fuel cell single cell, the fuel cell single cell including a gas diffusion layer, the gas diffusion layer being stacked with the plate, characterized in that, The plate electrode includes: A plate electrode body, on one side facing the gas diffusion layer, there is a gas flow channel. The gas flow channel includes a bottom wall, a first side wall and a second side wall. The first side wall and the second side wall are oppositely arranged on both sides of the bottom wall; A plurality of partitions, which are arranged at intervals in the gas flow channel along the extending direction of the gas flow channel. Each partition is respectively provided with a through hole, and the through hole allows gas to pass through. The through holes of two adjacent partitions are staggered; the partition is connected to the first side wall and / or the second side wall, and is spaced from the bottom wall to form a gap, so that when the gas flows through the gap, it accelerates and blows away the liquid water on the surface of the bottom wall.

2. The plate according to claim 1, characterized in that, The gas flow channel includes a first section and a second section. The inlet of the gas flow channel is arranged in the first section, and the outlet of the gas flow channel is arranged in the second section. At least the second section is provided with the partition.

3. The plate according to claim 1, characterized in that, The through holes on two adjacent partitions are staggered in the height direction of the gas flow channel.

4. The plate according to claim 1 or 3, characterized in that, The through holes on two adjacent partitions are staggered in the width direction of the gas flow channel.

5. The plate according to claim 1, characterized in that, Each partition is provided with at least two through holes, and the at least two through holes are arranged at intervals.

6. The plate according to claim 1, characterized in that, One end of the partition is close to the bottom wall, and the other end of the partition extends in a direction away from the bottom wall and is inclined towards the outlet direction of the gas flow channel.

7. The plate according to claim 1, wherein The height of the partition is not less than the height of the gas flow channel.

8. The plate according to claim 1, characterized in that, The plate electrode is provided with a plurality of gas flow channels, and the positions of the partitions in two adjacent gas flow channels are staggered.

9. A fuel cell single cell, characterized in that, Comprising: The plate electrode according to any one of claims 1-8, and the number of the plate electrodes is two; Gas diffusion layers, and the number of the gas diffusion layers is two. The two gas diffusion layers are arranged between the two plate electrodes; A proton exchange membrane, which is arranged between the two gas diffusion layers, and catalyst layers are covered on both side surfaces of the proton exchange membrane.

Images