Battery plate, self-drainage fuel cell and drainage control method of self-drainage fuel cell

Abstract

The invention relates to a battery plate, a self-drainage fuel cell and a drainage control method thereof. The surface of the battery pole plate is provided with a plurality of flow channel ridges which are arranged at intervals, adjacent flow channel ridges define flow channel grooves, and the flow channel grooves are sunken in the flow channel ridges; the runner ridge is used for abutting against the membrane electrode assembly, and the runner groove is used for accommodating liquid water generated by the membrane electrode assembly and discharging the liquid water; and the surface of the runner groove is subjected to hydrophilic treatment. The hydrophilic performance of the flow channel groove after hydrophilic treatment can be improved. When liquid water can seep from the microporous layer and contact with the surface of the flow channel groove, the flow channel groove has the capability of leading out the liquid water from the gas diffusion layer, so that the drainage performance of the flow channel groove is improved, the liquid water generated by the self-drainage fuel cell is convenient to drain, and the condition that the self-drainage fuel cell is flooded is further avoided; and the use performance of the self-drainage fuel cell is ensured. Meanwhile, the battery pole plate is simple in structure and convenient to process and form.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and in particular to a battery plate, a self-draining fuel cell and a drainage control method thereof. Background Art

[0002] A fuel cell is an electrochemical power source that can generate electricity and water through hydrogen-oxygen reactions. The water generated by the reaction needs to be discharged from the fuel cell stack in a timely manner. Otherwise, the generated water accumulates inside the fuel cell, which may cause the transmission channels of hydrogen and oxygen to be blocked, causing the performance of the fuel cell to be significantly reduced.

[0003] For a typical hydrogen-air fuel cell, pure hydrogen is used as a reducing agent and oxygen in the air is used as an oxidant. Water discharge mainly depends on the flowing reaction gas. The hydrogen side uses a recycling structure to form a hydrogen flow, and the air side supplies excess reaction gas, excess air, and nitrogen in the air that does not participate in the reaction are directly discharged to the external environment, and the water generated by the reaction is taken out through the flowing airflow.

[0004] However, for pure hydrogen and pure oxygen fuel cells, since pure oxygen is used as an oxidant, in order to ensure the utilization rate and safety of pure oxygen, the cathode side cannot directly discharge the unreacted gas like a hydrogen fuel cell, and a drainage structure is usually set on the plate. On the one hand, the processing technology of the drainage structure is complicated. On the other hand, the drainage of water from the inside of the fuel cell membrane electrode first needs to overcome the resistance formed by the interfacial water channel, which is easy to accumulate water in the microporous layer, affecting the drainage capacity of the drainage structure, causing a significant decrease in the gas flow on the cathode side, making it difficult to discharge the generated water in the fuel cell, which is very likely to cause flooding. Summary of the invention

[0005] Based on this, it is necessary to provide a battery plate, a self-draining fuel cell and a drainage control method thereof to address the problems of complex drainage structure and poor drainage capacity in current fuel cells. The battery plate has the ability to draw liquid water out of the gas diffusion layer, improve the drainage performance of the flow channel groove, avoid flooding of the self-draining fuel cell, and at the same time, reduce the complexity of the battery plate structure to facilitate processing and molding.

[0006] A battery plate, the surface of which has a plurality of flow channel ridges arranged at intervals, adjacent flow channel ridges are arranged to form flow channel grooves, and the flow channel grooves are sunken into the flow channel ridges;

[0007] The flow channel ridge is used to abut against the membrane electrode assembly, and the flow channel groove is used to accommodate liquid water generated by the membrane electrode assembly and discharge the liquid water;

[0008] The surface of the flow channel groove is subjected to hydrophilic treatment.

[0009] In one embodiment of the present application, the flow channel groove includes a bottom wall and two side walls, the two side walls are arranged opposite to each other, and the bottom wall is respectively connected to the two side walls;

[0010] The flow channel groove includes any of the following features:

[0011] In the first item, the bottom wall and the two side walls are both subjected to hydrophilic treatment;

[0012] The second item, the bottom wall is subjected to a hydrophilic treatment, and one of the two side walls is subjected to a hydrophilic treatment;

[0013] Thirdly, the bottom wall and the two side walls are subjected to hydrophilic treatment in sections.

[0014] In one embodiment of the present application, laser processing is used to perform hydrophilic treatment on the surface of the flow channel groove;

[0015] The laser processing can extend the flow channel groove by at least two scanning cycles, so that the side wall of the flow channel groove forms a stepped surface structure to guide the liquid water generated by the membrane electrode assembly to flow into the flow channel groove.

[0016] In one embodiment of the present application, a hydrophilic coating is coated on the surface of the flow channel groove.

[0017] In one embodiment of the present application, the flow channel groove and the flow channel ridge extend longitudinally and at least penetrate the bottom of the battery plate.

[0018] A self-draining fuel cell, comprising at least a membrane electrode assembly, a control component and a battery plate as described in any of the above technical features;

[0019] The battery plate comprises an anode plate and a cathode plate, and the membrane electrode assembly is arranged between the anode plate and the cathode plate;

[0020] The control component is used to generate thrust in the flow channel groove of the battery plate to discharge liquid water in the flow channel groove.

[0021] In one embodiment of the present application, the control component includes a controller and a control valve, the control valve is connected to the air inlet end of the flow channel groove and is in communication with the controller;

[0022] The controller can control the control valve to open or close so as to generate thrust in the flow channel groove.

[0023] In one embodiment of the present application, the control component includes a controller and a heat dissipation component, wherein the heat dissipation component is disposed on the outside of the battery plate and is communicatively connected with the controller;

[0024] The controller can adjust the heat dissipation capacity of the heat dissipation component to adjust the working pressure in the flow channel groove.

[0025] A drainage control method for a self-draining fuel cell, applied to a self-draining fuel cell according to any of the above technical features, the drainage control method comprising the following steps:

[0026] Obtaining control parameters in the flow channel groove;

[0027] The flow channel groove is subjected to intermittent sudden disturbance control according to the control parameter to generate thrust in the flow channel groove.

[0028] In one embodiment of the present application, the control parameter is a pressure parameter, and intermittent sudden disturbance control of the flow channel groove is performed according to the control parameter, which at least includes the following steps:

[0029] Obtaining the working pressure of the flow channel groove;

[0030] After a first preset time, the working pressure is controlled to increase or decrease to form a disturbance pressure;

[0031] After a second preset time has passed, controlling the disturbance pressure to return to the working pressure;

[0032] or,

[0033] The control parameter is a temperature parameter, and intermittent sudden disturbance control is performed on the flow channel groove according to the control parameter, which at least includes the following steps:

[0034] Obtaining the working pressure of the flow channel groove;

[0035] After a third preset time, the heat dissipation capacity of the heat dissipation component is adjusted to control the working pressure to be above or below, thereby forming a disturbance temperature;

[0036] After a fourth preset time has passed, the disturbance pressure is controlled to return to the working pressure.

[0037] After adopting the above technical solution, this application has at least the following technical effects:

[0038] The battery plate, self-draining fuel cell and drainage control method of the present application, in the battery plate, a plurality of flow channel ridges are arranged at intervals, two adjacent flow channel ridges are arranged to form a flow channel groove, and the flow channel groove is recessed in the flow channel ridge. The flow channel ridge can abut against the membrane electrode assembly, and the liquid water generated by the membrane electrode assembly can flow into the flow channel groove. The flow channel groove is hydrophilic so that the flow channel groove can lead the liquid water in the gas diffusion layer out.

[0039] The battery plate is subjected to a hydrophilic treatment on the flow channel groove. In this way, the hydrophilic treatment of the flow channel groove can increase its hydrophilic performance. When liquid water can seep out from the microporous layer and contact the surface of the flow channel groove, it can quickly adhere to the side of the flow channel groove and expand from the side of the flow channel groove to the bottom, so that the flow channel groove has the ability to draw liquid water from the gas diffusion layer, improve the drainage performance of the flow channel groove, facilitate the discharge of liquid water generated by the self-draining fuel cell, and thus avoid the self-draining fuel cell from being flooded, thereby ensuring the performance of the self-draining fuel cell. At the same time, the battery plate has a simple structure and is easy to process and form. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The structure of a battery plate according to an embodiment of the present application.

[0041] Figure 2 For use Figure 1 Side view of a self-draining fuel cell with cell plates shown.

[0042] Figure 3 for Figure 1 A partial perspective view of a battery plate is shown.

[0043] Figure 4 for Figure 3 Schematic diagram of laser processing of battery plates shown.

[0044] Figure 5 for Figure 4 Schematic diagram of liquid water being drawn out of battery plates.

[0045] Figure 6 for Figure 1 Schematic diagram of the flow of liquid water in the battery plates shown.

[0046] Figure 7 for Figure 1 Schematic diagram of the forces acting on liquid water in the flow channel groove shown.

[0047] Figure 8 This is a flow chart of a drainage control method according to an embodiment of the present application.

[0048] Fig. 9 This is a comparison chart of the effect of hydrophilic treatment and non-hydrophilic treatment on the voltage of a self-draining fuel cell on the flow channel groove.

[0049] Fig.10 This is a comparison chart of the effects of disturbance control and non-disturbance control of the flow channel groove on the voltage of the self-draining fuel cell.

[0050] Among them: 10, self-draining fuel cell; 100, battery plate; 101, anode plate; 102, cathode plate; 110, flow channel ridge; 120, flow channel groove; 121, bottom wall; 122, side wall; 123, trapezoidal structure; 200, membrane electrode assembly; 300, droplet. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0052] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0053] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0055] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "on" or "below" a second feature, etc., or the like, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0057] It is understandable that for current fuel cells, pure hydrogen is used as a reducing agent and oxygen in the air is used as an oxidant. The two react to produce liquid water, and a drainage structure needs to be set on the electrode plate to discharge the liquid water in the fuel cell through the drainage structure. At present, the processing technology of the drainage structure in the fuel cell is complicated. At the same time, the water discharged from the inside of the fuel cell membrane electrode first needs to overcome the resistance formed by the interfacial water channel, which is easy to accumulate water in the microporous layer, affecting the drainage capacity of the drainage structure, causing the gas flow on the cathode side to drop significantly, resulting in the difficulty of discharging the generated water in the fuel cell, which is very likely to cause flooding.

[0058] See also Figure 1 and Figure 2 To this end, the present application provides a new type of battery plate 100, which is applied to a self-draining fuel cell 10. Figure 1 The structure of the battery plate 100 according to an embodiment of the present application is as follows: Figure 2 For use Figure 1 A side view of a self-draining fuel cell 10 with a battery plate 100 is shown. The battery plate 100 is an anode plate 101 and a cathode plate 102 of the self-draining fuel cell 10. The self-draining fuel cell 10 is a hydrogen fuel cell. Of course, in other embodiments of the present application, the self-draining fuel cell 10 can also be a pure hydrogen, pure oxygen fuel cell or other fuel cells capable of producing liquid water.

[0059] The battery plate 100 has the ability to draw liquid water out of the gas diffusion layer, improves the drainage performance of the flow channel groove 120, facilitates the drainage of liquid water generated by the self-draining fuel cell 10, and thus avoids the self-draining fuel cell 10 from being flooded, thereby ensuring the performance of the self-draining fuel cell 10. At the same time, the complexity of the structure of the battery plate 100 is reduced, and processing and molding are convenient.

[0060] To better explain the structure of the battery plate 100, the structure of the self-draining fuel cell 10 is briefly introduced here. The self-draining fuel cell 10 at least includes a membrane electrode assembly 200 and the battery plate 100 of the present application. The battery plate 100 includes an anode plate 101 and a cathode plate 102, the anode plate 101 and the cathode plate 102 are arranged opposite to each other, and the membrane electrode assembly 200 is arranged between the anode plate 101 and the cathode plate 102, and abuts against the anode plate 101 and the cathode plate 102, such as Figure 1 and Figure 2 shown.

[0061] The battery plates 100 are located on both sides, serving as the anode plate 101 and cathode plate 102 of the self-draining fuel cell 10. The membrane electrode assembly 200 includes a proton exchange membrane (not shown) and an electrode (not shown). The membrane electrode assembly 200 and the anode plate 101 and cathode plate 102 on both sides form the self-draining fuel cell 10. The membrane electrode assembly 200 provides a channel for the migration and transport of protons, so that protons pass through the membrane from the anode to the cathode, and form a loop with the electron transfer of the external circuit to provide current to the outside world.

[0062] When the self-draining fuel cell 10 is in operation, hydrogen and oxygen undergo an electrochemical reaction in the membrane electrode assembly 200. Specifically, when the self-draining fuel cell 10 is in operation, hydrogen enters the interior of the self-draining fuel cell 10 from the anode plate 101, and under the action of the catalyst, hydrogen atoms become protons after losing electrons in the anode plate 101, and the protons pass through the membrane electrode assembly 200 inside the self-draining fuel cell 10 to reach the cathode plate 102.

[0063] At the same time, the electrons also reach the cathode plate 102 via the external loop. On the cathode plate 102 side, protons, electrons and oxygen combine to generate liquid water, thereby generating current. Liquid water can be generated after the electrochemical reaction between hydrogen and oxygen, and the liquid water is discharged through the flow channel groove 120 on the surface of the battery plate 100, and the accumulation of liquid water on the surface of the battery plate 100 is avoided as much as possible to ensure the performance of the self-draining fuel cell 10.

[0064] The specific structure of a battery plate 100 according to an embodiment is introduced below.

[0065] See also Figure 1 and Figure 3In one embodiment, the surface of the battery plate 100 has a plurality of flow channel ridges 110 arranged at intervals, and the adjacent flow channel ridges 110 are arranged to form flow channel grooves 120, and the flow channel grooves 120 are recessed in the flow channel ridges 110. The flow channel ridges 110 are used to abut against the membrane electrode assembly 200, and the flow channel grooves 120 are used to accommodate liquid water generated by the membrane electrode assembly 200 and discharge the liquid water. The surface of the flow channel grooves 120 is subjected to hydrophilic treatment. Figure 3 for Figure 1 A partial perspective view of a battery plate 100 is shown.

[0066] The battery plate 100 is a graphite plate, and one surface of the battery plate 100 has a plurality of flow channel ridges 110. The flow channel ridges 110 protrude from the surface of the battery plate 100 and are arranged at intervals along the battery plate 100. Flow channel grooves 120 are arranged between adjacent flow channel ridges 110, and the flow channel grooves 120 are arranged concavely on the surface of the flow channel ridges 110. That is, the plurality of flow channel ridges 110 and the plurality of flow channel grooves 120 are arranged alternately on the surface of the battery plate 100, forming a concave-convex staggered structure.

[0067] The flow channel groove 120 is responsible for the gas distribution and liquid water drainage inside the self-draining fuel cell 10. It is worth noting that the battery plate 100 and the self-draining fuel cell 10 of the present application mainly study how to drain the liquid water in the self-draining fuel cell 10, so only the function of the flow channel groove 120 to drain the liquid water is described here, and the distribution of hydrogen and oxygen and their electrochemical reactions are not described here.

[0068] The flow channel ridge 110 is arranged to protrude from the flow channel groove 120, and the membrane electrode assembly 200 is arranged between the two battery plates 100 and abuts against the battery plates 100. At this time, the surface of the flow channel ridge 110 abuts against the membrane electrode assembly 200, and liquid water can seep out from the microporous layer of the membrane electrode assembly 200. The membrane electrode assembly 200 can flow the liquid water generated by the electrochemical reaction into the flow channel groove 120 through the flow channel ridge 110, and discharge the liquid water from the self-draining fuel cell 10 through the flow channel groove 120.

[0069] In order to improve the drainage capacity of the flow channel groove 120, the present application performs a hydrophilic treatment on the flow channel groove 120. After the hydrophilic treatment, the flow channel groove 120 is a hydrophilic area, which can increase the hydrophilic groups on the surface of the flow channel groove 120. In this way, the hydrophilic performance of the flow channel groove 120 can be improved, and the surface tension of the flow channel groove 120 can be increased. The flow channel groove 120 can absorb the liquid water in the membrane electrode assembly 200 through the surface tension, thereby improving the discharge capacity of the liquid water from the microporous layer of the membrane electrode assembly 200, and preventing the liquid water from forming droplets 300 on the side wall 122 of the flow channel groove 120.

[0070] That is, after the flow channel groove 120 is hydrophilic, the flow channel groove 120 can partially draw liquid water from the gas diffusion layer (membrane electrode assembly 200, which will not be described in detail below), so that the liquid water generated by the electrochemical reaction can enter the flow channel groove 120. In this way, the liquid water can enter the flow channel groove 120 from the membrane electrode assembly 200 and be discharged along the flow channel groove 120, thereby preventing the liquid water from accumulating in the self-draining fuel cell 10.

[0071] The battery plate 100 of the above embodiment performs a hydrophilic treatment on the flow channel groove 120. In this way, the flow channel groove 120 after the hydrophilic treatment can increase its hydrophilic performance. When liquid water can seep out from the microporous layer and contact the surface of the flow channel groove 120, it can quickly adhere to the side of the flow channel groove 120 and expand from the side of the flow channel groove 120 to the bottom, so that the flow channel groove 120 has the ability to draw liquid water from the gas diffusion layer, improve the drainage performance of the flow channel groove 120, facilitate the discharge of liquid water generated by the self-draining fuel cell 10, and thus avoid the self-draining fuel cell 10 from being flooded, thereby ensuring the performance of the self-draining fuel cell 10.

[0072] At the same time, after the flow channel groove 120 of the battery plate 100 is hydrophilic, liquid water can enter the flow channel groove 120 from the membrane electrode assembly 200 and be discharged along the flow channel groove 120, thereby achieving the purpose of drainage. After the flow channel groove 120 is treated with the hydrophilic treatment process, there is no need to set a complex structure in the flow channel groove 120. The battery plate 100 has a simple structure, is easy to process and mold, and reduces the difficulty of processing.

[0073] like Fig. 9 As shown, Fig. 9 1 is a comparison chart showing the effect of the flow channel groove 120 with and without hydrophilic treatment on the voltage of the self-draining fuel cell 10. Fig. 9 In the figure, the solid line represents the curve of the voltage of the self-draining fuel cell 10 changing with time when the flow channel groove 120 is hydrophilic treated; the dotted line represents the curve of the voltage of the self-draining fuel cell 10 changing with time when the flow channel groove is not hydrophilic treated.

[0074] exist Fig. 9 In the figure, when the flow channel groove is not treated with hydrophilicity, the curve indicated by the dotted line fluctuates greatly. The voltage of the self-draining fuel cell fluctuates slightly at the beginning. As the use time of the self-draining fuel cell increases, the voltage of the self-draining fuel cell will suddenly drop and then suddenly rise, and drop and rise back and forth. That is, when the flow channel groove is not treated with hydrophilicity, the voltage of the self-draining fuel cell will fluctuate greatly, which will affect the stability of the self-draining fuel cell.

[0075] exist Fig. 9In the present application, the flow channel groove 120 is subjected to a hydrophilic treatment, and the solid line indicates that the voltage curve has a small fluctuation, indicating that after the flow channel groove 120 is subjected to the hydrophilic treatment, the voltage of the self-draining fuel cell 10 is basically maintained in a constant range without large fluctuations, thereby avoiding a sudden drop in the voltage of the self-draining fuel cell 10 and ensuring the performance of the self-draining fuel cell 10.

[0076] See also Figure 1 and Figure 3 In one embodiment, the flow channel groove 120 includes a bottom wall 121 and two side walls 122. The two side walls 122 are arranged opposite to each other, and the bottom wall 121 connects the two side walls 122 respectively. The bottom wall 121 is the bottom surface of the flow channel groove 120, and the side wall 122 is the surface of the side wall 122 of the flow channel groove 120. The two side walls 122 are arranged on both sides of the bottom wall 121, and are arranged together with the bottom wall 121 to form a concave flow channel groove 120. In addition, the side wall 122 is also the outer surface of the flow channel ridge 110.

[0077] After the top surface of the flow channel ridge 110 abuts against the membrane electrode assembly 200, liquid water can seep out from the microporous layer of the membrane electrode assembly 200 and contact the flow channel groove 120. The liquid water can quickly adhere to the side wall 122 of the flow channel groove 120 and expand from the side wall 122 to the bottom wall 121, so that the flow channel groove 120 has the ability to lead the liquid water out of the gas diffusion layer. In this way, the liquid water can gather in the flow channel groove 120 and flow out along the flow channel groove 120.

[0078] See also Figures 1 to 3 In one embodiment, the bottom wall 121 and the two side walls 122 are hydrophilic. That is, the entire flow channel groove 120 is hydrophilic. In this way, when liquid water can seep out from the microporous layer of the membrane electrode assembly 200 and contact the flow channel groove 120, the liquid water can adhere to the two side walls 122 of the flow channel groove 120, thereby improving the ability of the flow channel groove 120 to lead liquid water out of the gas diffusion layer, thereby improving the drainage capacity of the flow channel groove 120.

[0079] Of course, in other embodiments of the present application, the bottom wall 121 is subjected to hydrophilic treatment, and one of the two side walls 122 is subjected to hydrophilic treatment; or, the bottom wall 121 and the two side walls 122 are subjected to hydrophilic treatment in sections.

[0080] That is, the flow channel groove 120 can be partially hydrophilized without affecting the drainage capacity of the flow channel groove 120. In this way, liquid water can still seep from the microporous layer of the membrane electrode assembly 200 into the flow channel groove 120, and at the same time, the time for hydrophilizing the flow channel groove 120 can be reduced.

[0081] In the present application, only the bottom wall 121 and the two side walls 122 of the flow channel groove 120 are subjected to hydrophilic treatment, and the form of local treatment of the flow channel groove 120 is not repeated here.

[0082] See also Figure 1 and Figure 3 In one embodiment, laser processing is used to perform hydrophilic treatment on the surface of the flow channel groove 120. The laser is used to scan the bottom wall 121 and the two side walls 122 of the flow channel groove 120 to destroy the hydrophobic structure of the bottom wall 121 and the two side walls 122 of the flow channel groove 120.

[0083] In this way, the hydrophilic groups in the flow channel groove 120 after laser processing are greatly increased, so that the hydrophilic performance of the flow channel groove 120 is greatly improved, and the surface tension of the flow channel groove 120 is utilized so that when liquid water seeps out from the microporous layer and contacts the flow channel groove 120, the liquid water can quickly adhere to the two side walls 122 of the flow channel groove 120 and expand from the side walls 122 to the bottom wall 121, thereby improving the ability of the flow channel groove 120 to draw liquid water out of the gas diffusion layer, thereby improving the drainage capacity of the flow channel groove 120.

[0084] See also Figures 3 to 5 In one embodiment, the laser processing can extend the flow channel groove 120 by at least two scanning cycles, so that the side wall 122 of the flow channel groove 120 forms a stepped structure to guide the liquid water generated by the membrane electrode assembly 200 to flow into the flow channel groove 120. Figure 4 for Figure 3 The schematic diagram of the battery plate 100 being laser processed is shown in FIG. Figure 5 for Figure 4 A schematic diagram of a battery plate 100 for extracting liquid water is shown.

[0085] When the bottom wall 121 and the two side walls 122 of the flow channel groove 120 are processed by laser, the bottom wall 121 of the flow channel groove 120 is relatively easy to process, and the difficulty lies in the processing of the two side walls 122 of the flow channel groove 120. Generally, the laser can only process objects in the vertical direction, and the side walls 122 are parallel to the laser, such as Figure 4 As shown, Figure 4 The arrow direction is the direction of laser scanning.

[0086] In order to perform laser processing on the side wall 122, when setting the laser processing surface, the laser processing surface is extended outward by at least two scanning cycles, such as two to three scanning cycles. Figure 4 As shown, the laser scans to the edge of the flow channel ridge 110.

[0087] That is, the laser can process the edge of the flow channel ridge 110, so that the side wall 122 of the flow channel groove 120 can be processed by the scanning laser to form a hydrophilic trapezoidal structure 123. In other words, after two to three scanning cycles of the processing surface extending outward, the side wall 122 of the flow channel groove 120 can form a hydrophilic trapezoidal structure 123.

[0088] After the processing is completed, after the flow channel ridge 110 contacts the membrane electrode assembly 200, the area where the flow channel ridge 110 contacts the membrane electrode assembly 200 exhibits a certain degree of hydrophilicity, and the hydrophilic trapezoidal structure 123 guides liquid water to be discharged from the membrane electrode assembly 200 along the hydrophilic area of ​​the flow channel groove 120, such as Figure 5 As shown, Figure 5 The arrow direction is the flow direction of liquid water. Figure 5 The area of ​​the middle flow channel groove 120 is a hydrophilic area.

[0089] The hydrophilic trapezoidal structure 123 can lead liquid water out of the gas diffusion layer, and the hydrophilic trapezoidal structure 123 has a guiding function to guide the liquid water to flow along it. In this way, the liquid water flows along the hydrophilic area of ​​the side wall 122 to converge into the flow channel groove 120 and drain along the flow channel groove 120.

[0090] Of course, in other embodiments of the present application, a hydrophilic coating is applied to the surface of the flow channel groove 120. In other words, a hydrophilic coating is applied to the side wall 122 and the bottom wall 121 of the flow channel groove 120. In this way, the hydrophilicity of the flow channel groove 120 can be increased, so that the flow channel groove 120 can lead liquid water out of the gas diffusion layer, thereby improving the drainage capacity of the flow channel groove 120.

[0091] The battery plate 100 of the present application uses hydrophilic treatment on the surface of the flow channel groove 120 to improve the hydrophilicity of the flow channel groove 120. At this time, once the liquid water in the gas diffusion layer contacts the hydrophilic area of ​​the flow channel groove 120, the liquid water can be quickly sucked out to the side wall 122 of the flow channel groove 120, so that the liquid water will not be far from the inside of the gas diffusion layer.

[0092] At the same time, the liquid water sucked out into the flow channel groove 120 will not gather into water droplets due to its affinity with the side wall 122 and the bottom wall 121, but will form a water film on the surface of the flow channel groove 120. Compared with water droplets, the water film is easier to flow in the flow channel groove 120, and is not easy to block the flow channel groove 120. In this way, the accumulation of liquid water in the flow channel groove 120 can be avoided, thereby preventing the self-draining fuel cell 10 from being flooded.

[0093] See also Figure 1 and Figure 6In one embodiment, the flow channel groove 120 and the flow channel ridge 110 extend in the longitudinal direction and at least penetrate the bottom of the battery plate 100 . Figure 6 for Figure 1 A schematic diagram of the flow of liquid water in a battery plate 100 is shown.

[0094] In the design of the battery stack, considering that the drainage capacity of the fully enclosed self-draining fuel cell 10 is relatively weak, it is necessary to make full use of the effect of gravity on liquid water. Figure 1 and Figure 6 That is, the flow channel groove 120 and the flow channel ridge 110 of the battery plate 100 both extend in the longitudinal direction.

[0095] The extension direction of the flow channel groove 120 is perpendicular to the ground direction, and the air intake direction of the self-draining fuel cell 10 is all in accordance with the upper end intake and the lower end exhaust. In this way, after the liquid water seeps out from the microporous layer to the flow channel groove 120, under the action of gravity, the liquid water can flow downward along the surface of the flow channel groove 120, thereby improving the drainage capacity of the liquid water.

[0096] like Figure 1 and Figure 6 As shown, the battery plate 100 of the present application is designed to extend the flow channel groove 120 in the longitudinal direction. After a plurality of self-draining fuel cells 10 are connected in series and / or in parallel to form a battery stack, the flow channel groove 120 also always extends in the longitudinal direction. In this way, the liquid water in the flow channel groove 120 can be naturally discharged under the action of gravity, thereby improving the drainage capacity of the flow channel groove 120 and preventing the accumulation of liquid water in the flow channel groove 120 to cause blockage.

[0097] See also Figures 1 to 3 , Figure 7 The present application also provides a self-draining fuel cell 10. The self-draining fuel cell 10 at least includes a membrane electrode assembly 200, a control component (not shown), and a battery plate 100 as described in any of the above embodiments. The battery plate 100 includes an anode plate 101 and a cathode plate 102, and the membrane electrode assembly 200 is arranged between the anode plate 101 and the cathode plate 102. The control component is used to generate thrust in the flow channel groove 120 of the battery plate 100 to discharge liquid water in the flow channel groove 120. Figure 7 for Figure 1 FIG. 1 is a schematic diagram showing the force acting on liquid water in the flow channel groove 120 .

[0098] The membrane electrode assembly 200 is disposed between the cathode plate 102 and the anode plate 101, and abuts against the flow channel ridge of the battery plate 100 to form a single self-draining fuel cell 10. A plurality of single self-draining fuel cells 10 are connected in series and / or in parallel to form a stack. When the stack is working, the fuel (usually hydrogen) and the oxidant (usually oxygen in the air) enter the membrane electrode assembly 200 through their respective channels, and an electrochemical reaction occurs on the membrane electrode assembly 200 to generate current and liquid water.

[0099] It is understandable that after the flow channel grooves 120 are arranged in the longitudinal direction, most of the liquid water in the flow channel grooves 120 can be discharged under the action of gravity. However, due to the non-uniformity of the surface properties of the flow channel grooves 120 and the difference in local water production and drainage, a relatively thick water film (liquid droplet 300) may be accumulated in the local area of ​​the flow channel grooves 120. At this time, due to the thick water film, it is difficult for the liquid water in the membrane electrode assembly 200 to be absorbed by the surface tension of the flow channel grooves 120, thereby reducing the drainage performance of the flow channel grooves 120.

[0100] To this end, the present application sets a control component in the self-draining fuel cell 10, and the control component can disturb the flow channel groove 120. After the control component disturbs, it can generate thrust in the flow channel groove 120, and the thrust can push the droplet 300 attached to the flow channel groove 120, so that the liquid water can be discharged from the flow channel groove 120 under the action of the thrust.

[0101] like Figure 7 As shown, there are three forces on the droplet 300 attached to the flow channel groove 120. The first is the downward gravity of the droplet 300 itself, and the arrow indicates the downward direction. The second is the upward surface tension generated by the droplet 300 and the flow channel groove 120, and the arrow indicates the upward direction. The third is the thrust of the gas flow in the flow channel groove 120 after the control component disturbs the flow channel groove 120, and the thrust is shown by the arrow on the side of the droplet 300.

[0102] The combined force of thrust and gravity is greater than the surface tension, so that the downward force on the droplet 300 increases, and the droplet 300 can flow along the flow channel groove 120 to be discharged from the flow channel groove 120, thereby avoiding blockage of the flow channel groove 120 and improving the drainage capacity of the flow channel groove 120.

[0103] That is, after the flow channel groove 120 is disturbed by the control component, the thrust generated by the flowing gas can act on the droplets 300 attached to the flow channel groove 120. The thrust combined with gravity causes the droplets 300 to flow along the flow channel groove 120, making the droplets 300 attached to the flow channel groove 120 discharged more smoothly.

[0104] In one embodiment of the present application, the control component includes a controller (not shown) and a control valve (not shown), the control valve is connected to the air inlet end of the flow channel groove 120 and is communicatively connected to the controller, and the controller can control the control valve to open or close to adjust the working pressure in the flow channel groove 120.

[0105] The present application generates thrust on the droplets 300 attached to the surface of the flow channel groove 120 through pressure disturbance. The control valve is a valve for gas to enter the flow channel groove 120, and the controller is a component for controlling the control valve. When the controller controls the control valve to be closed, the gas will not enter the flow channel groove 120, and when the controller controls the control valve to be opened, the gas can enter the flow channel groove 120.

[0106] Moreover, by adjusting the opening of the control valve, the gas flow in the flow channel groove 120 can be adjusted, thereby also adjusting the gas pressure. When the control valve is closed or the opening is reduced, the pressure in the flow channel groove 120 is reduced, and when the control valve is opened or the opening is increased, the pressure in the flow channel groove 120 is increased. In this way, the pressure in the flow channel groove 120 can be adjusted, and the gas attached to the flow channel groove 120 can be disturbed, thereby increasing the drainage performance of the flow channel groove 120.

[0107] When the pressure disturbance generates thrust on the droplet 300 attached to the surface of the flow channel groove 120, the normal working pressure is preset to P0. After working for a period of time, such as the first preset time, when the voltage of the self-draining fuel cell 10 changes, the pressure disturbance is started to control the working pressure P0 to increase or decrease, so that the working pressure P0 changes to the disturbance pressure P0±ΔP.

[0108] The disturbance pressure P0±ΔP can change the pressure in the flow channel groove 120, thereby changing the thrust of the gas in the flow channel groove 120, so that the thrust can act on the droplets 300 attached to the surface of the flow channel groove 120, so that the droplets 300 can flow in the flow channel groove 120, and then the droplets 300 can be discharged from the flow channel groove 120, thereby increasing the drainage performance of the flow channel groove 120. After t0 time, such as the second preset time, the disturbance pressure P0±ΔP is controlled to return to the working pressure P0.

[0109] In this way, the flow channel groove 120 returns to a normal drainage state. When the voltage of the self-draining fuel cell 10 remains substantially unchanged, the flow channel groove 120 is not disturbed, and at this time, the flow channel groove 120 is in a normal drainage state. When the voltage of the self-draining fuel cell 10 drops, the flow channel groove 120 can be disturbed by controlling the on-off and opening adjustment of the control valve so that the droplets 300 in the flow channel groove 120 are discharged. After the voltage of the self-draining fuel cell 10 returns to the normal operating voltage, the flow channel groove 120 is not disturbed.

[0110] It is understandable that when the working pressure is stable, the thrust of the gas flow depends on the gas consumption rate, and this flow rate is very slow. When the working pressure changes actively, the flow rate changes along with the working pressure change, which increases the downward force on the droplet 300, making the discharge process smoother.

[0111] In this embodiment, when the pressure disturbance generates thrust on the droplet 300 attached to the surface of the flow channel groove 120, the normal working pressure is preset to P0. After working for a period of time, such as the first preset time, the voltage of the self-draining fuel cell 10 changes, and the pressure disturbance is started to control the working pressure P0 to increase, so that the working pressure P0 changes to the disturbance pressure P0+ΔP. After t0 time, such as the second preset time, the disturbance pressure P0+ΔP is controlled to return to the working pressure P0.

[0112] Of course, in other embodiments, when the pressure disturbance generates thrust on the droplet 300 attached to the surface of the flow channel groove 120, the normal working pressure is preset to P0. After working for a period of time, such as the first preset time, the voltage of the self-draining fuel cell 10 changes, and the pressure disturbance is started to control the working pressure P0 to decrease, so that the working pressure P0 changes to the disturbance pressure P0-ΔP. After t0 time, such as the second preset time, the disturbance pressure P0-ΔP is controlled to return to the working pressure P0.

[0113] like Fig.10 As shown, Fig.10 1 is a comparison diagram of the effects of disturbance control and no disturbance control on the voltage of the self-draining fuel cell 10 of the flow channel groove 120. Fig.10 In FIG. 1 , the solid line represents the curve of the voltage of the self-draining fuel cell 10 changing with time when the flow channel groove 120 is disturbed; the dotted line represents the curve of the voltage of the self-draining fuel cell 10 changing with time when the flow channel groove is disturbed.

[0114] When the flow channel groove is controlled without disturbance, Fig.10 In the figure, the curve indicated by the dotted line fluctuates greatly. When the self-draining fuel cell is in use, the voltage of the self-draining fuel cell will suddenly drop and then suddenly rise, and drop and rise repeatedly, that is, when the flow channel groove is controlled without disturbance, the voltage of the self-draining fuel cell will fluctuate greatly, which will affect the stability of the self-draining fuel cell.

[0115] The present application performs disturbance control on the flow channel groove 120. Fig.10 In the figure, the solid line indicates that the voltage curve fluctuates less, indicating that after the disturbance control of the flow channel groove 120, the voltage of the self-draining fuel cell 10 is basically maintained in a constant range without large fluctuations, thereby avoiding the voltage drop of the self-draining fuel cell 10 and ensuring the performance of the self-draining fuel cell 10.

[0116] In another embodiment of the present application, the control component includes a controller (not shown) and a heat dissipation component (not shown), wherein the heat dissipation component is disposed on the outer side of the battery plate 100 and is communicatively connected to the controller. The controller can adjust the heat dissipation capacity of the heat dissipation component to adjust the working pressure in the flow channel groove 120.

[0117] The present application generates thrust on the droplets 300 attached to the surface of the flow channel groove 120 through temperature disturbance. The temperature disturbance is the change in the working temperature of the heat dissipation component. In order to achieve heat dissipation of the self-draining fuel cell 10, a heat dissipation component is usually arranged on the outside of the self-draining fuel cell 10, and the heat dissipation component is a radiator, etc. The heat dissipation component can dissipate the heat of the self-draining fuel cell 10 to ensure the performance of the self-draining fuel cell 10.

[0118] Moreover, the heat dissipated by the heat dissipation component is controllable, the heat dissipation component is connected to the controller for communication, and the controller can control the heat dissipation capacity of the heat dissipation component. The controller can adjust the opening size of the heat dissipation component to adjust the heat dissipation capacity of the heat dissipation component.

[0119] If the heat dissipation capacity of the heat dissipation component decreases, at this time, the heat in the self-draining fuel cell 10 increases, and the working pressure in the flow channel groove 120 increases. If the heat dissipation capacity of the heat dissipation component increases, at this time, the heat in the self-draining fuel cell 10 decreases, and the working pressure in the flow channel groove 120 decreases.

[0120] When the temperature disturbance generates thrust on the droplets 300 attached to the surface of the flow channel groove 120, the normal working pressure in the flow channel groove 120 is preset to be P0. After working for a period of time, such as the third preset time, when the voltage of the self-draining fuel cell 10 changes, the heat dissipation capacity of the heat dissipation component is adjusted to control the working pressure P0 to increase or decrease, so that the working pressure P0 changes to the disturbance pressure P0±ΔP.

[0121] The disturbance pressure P0±ΔP can change the pressure in the flow channel groove 120, thereby changing the thrust of the gas in the flow channel groove 120, so that the thrust can act on the droplets 300 attached to the surface of the flow channel groove 120, so that the droplets 300 can flow in the flow channel groove 120, and then the droplets 300 can be discharged from the flow channel groove 120, thereby increasing the drainage performance of the flow channel groove 120. After t0 time, such as the fourth preset time, the heat dissipation capacity of the heat dissipation component is adjusted, and the disturbance pressure P0±ΔP is controlled to return to the working pressure P0.

[0122] In this way, by changing the heat dissipation capacity of the heat dissipation component, the working pressure in the flow channel groove 120 can be changed, thereby realizing the adjustment of the working pressure in the flow channel groove 120, disturbing the material attached to the flow channel groove 120, and increasing the drainage performance of the flow channel groove 120.

[0123] It is worth noting that the principles of the above two disturbances to the flow channel groove 120 are essentially the same, and both are achieved by changing the working pressure of the flow channel groove 120, but the methods of changing the working pressure are different. One is to adjust the working pressure by controlling the on-off and opening of the control valve, and the other is to adjust the working pressure by adjusting the heat dissipation capacity of the heat dissipation component.

[0124] The self-draining fuel cell 10 of the present application sets the flow channel groove 120 in the longitudinal direction, so that the liquid water in the flow channel groove 120 can be naturally discharged under the action of gravity. At the same time, through the pressure disturbance strategy, a slightly disturbed airflow can be formed in the flow channel groove 120, and the airflow can generate a thrust on the droplets 300 in the flow channel groove 120, so as to move the water film in transient equilibrium and realize the discharge of the droplets 300 attached to the surface of the flow channel groove 120.

[0125] When the self-draining fuel cell 10 decreases with the use voltage, the pressure disturbance strategy can significantly promote the static drainage of the self-draining fuel cell 10, significantly improve the output performance of the self-draining fuel cell 10, and extend the non-drainage time of the self-draining fuel cell 10.

[0126] See also Figure 7 and Figure 8 , Figure 8 This is a flow chart of a drainage control method according to an embodiment of the present application. The present application also provides a drainage control method for a self-draining fuel cell 10, which is applied to the self-draining fuel cell 10 according to any of the above embodiments, and the drainage control method comprises the following steps:

[0127] Obtaining control parameters in the flow channel groove 120;

[0128] The flow channel groove 120 is subjected to intermittent sudden disturbance control according to the control parameter to generate thrust in the flow channel groove 120 .

[0129] The present application obtains the control parameters of the flow channel groove 120 through the control component, and the control component can disturb the flow channel groove 120 according to the control parameters. After the control component disturbs, the thrust generated by the flowing gas can act on the droplets 300 attached to the flow channel groove 120, and the thrust combined with gravity makes the droplets 300 flow along the flow channel groove 120, so that the droplets 300 attached to the flow channel groove 120 can be discharged more smoothly.

[0130] In an embodiment of the present application, the control parameter is a pressure parameter, and intermittent sudden disturbance control of the flow channel groove 120 is performed according to the control parameter, which at least includes the following steps:

[0131] Obtaining the working pressure of the flow channel groove 120;

[0132] After a first preset time, the working pressure is controlled to increase or decrease to form a disturbance pressure;

[0133] After a second preset time has passed, the disturbance pressure is controlled to return to the working pressure.

[0134] The present application generates thrust on the droplets 300 attached to the surface of the flow channel groove 120 through pressure disturbance. The control valve is a valve for gas to enter the flow channel groove 120, and the controller is a component for controlling the control valve. When the controller controls the control valve to be closed, the gas will not enter the flow channel groove 120, and when the controller controls the control valve to be opened, the gas can enter the flow channel groove 120.

[0135] Moreover, by adjusting the opening of the control valve, the gas flow in the flow channel groove 120 can be adjusted, thereby also adjusting the gas pressure. When the control valve is closed or the opening is reduced, the pressure in the flow channel groove 120 is reduced, and when the control valve is opened or the opening is increased, the pressure in the flow channel groove 120 is increased. In this way, the pressure in the flow channel groove 120 can be adjusted, and the gas attached to the flow channel groove 120 can be disturbed, thereby increasing the drainage performance of the flow channel groove 120.

[0136] When the pressure disturbance generates thrust on the droplet 300 attached to the surface of the flow channel groove 120, the normal working pressure is preset to P0. After working for a period of time, such as the first preset time, when the voltage of the self-draining fuel cell 10 changes, the pressure disturbance is started to control the working pressure P0 to increase or decrease, so that the working pressure P0 changes to the disturbance pressure P0±ΔP.

[0137] The disturbance pressure P0±ΔP can change the pressure in the flow channel groove 120, thereby changing the thrust of the gas in the flow channel groove 120, so that the thrust can act on the droplets 300 attached to the surface of the flow channel groove 120, so that the droplets 300 can flow in the flow channel groove 120, and then the droplets 300 can be discharged from the flow channel groove 120, thereby increasing the drainage performance of the flow channel groove 120. After t0 time, such as the second preset time, the disturbance pressure P0±ΔP is controlled to return to the working pressure P0.

[0138] In this way, the flow channel groove 120 returns to a normal drainage state. When the voltage of the self-draining fuel cell 10 remains substantially unchanged, the flow channel groove 120 is not disturbed, and at this time, the flow channel groove 120 is in a normal drainage state. When the voltage of the self-draining fuel cell 10 drops, the flow channel groove 120 can be disturbed by controlling the on-off and opening adjustment of the control valve so that the droplets 300 in the flow channel groove 120 are discharged. After the voltage of the self-draining fuel cell 10 returns to the normal operating voltage, the flow channel groove 120 is not disturbed.

[0139] In another embodiment of the present application, the control parameter is a temperature parameter, and intermittent sudden disturbance control is performed on the flow channel groove 120 according to the control parameter, which at least includes the following steps:

[0140] Obtaining the working pressure of the flow channel groove 120;

[0141] After a third preset time, the heat dissipation capacity of the heat dissipation component is adjusted to control the working pressure to be above or below, thereby forming a disturbance temperature;

[0142] After a fourth preset time has passed, the disturbance pressure is controlled to return to the working pressure.

[0143] The present application generates thrust on the droplets 300 attached to the surface of the flow channel groove 120 through temperature disturbance. The temperature disturbance is the change in the working temperature of the heat dissipation component. In order to achieve heat dissipation of the self-draining fuel cell 10, a heat dissipation component is usually arranged on the outside of the self-draining fuel cell 10, and the heat dissipation component is a radiator, etc. The heat dissipation component can dissipate the heat of the self-draining fuel cell 10 to ensure the performance of the self-draining fuel cell 10.

[0144] Moreover, the heat dissipated by the heat dissipation component is controllable, the heat dissipation component is connected to the controller for communication, and the controller can control the heat dissipation capacity of the heat dissipation component. The controller can adjust the opening size of the heat dissipation component to adjust the heat dissipation capacity of the heat dissipation component.

[0145] If the heat dissipation capacity of the heat dissipation component decreases, at this time, the heat in the self-draining fuel cell 10 increases, and the working pressure in the flow channel groove 120 increases. If the heat dissipation capacity of the heat dissipation component increases, at this time, the heat in the self-draining fuel cell 10 decreases, and the working pressure in the flow channel groove 120 decreases.

[0146] When the temperature disturbance generates thrust on the droplets 300 attached to the surface of the flow channel groove 120, the normal working pressure in the flow channel groove 120 is preset to be P0. After working for a period of time, such as the third preset time, when the voltage of the self-draining fuel cell 10 changes, the heat dissipation capacity of the heat dissipation component is adjusted to control the working pressure P0 to increase or decrease, so that the working pressure P0 changes to the disturbance pressure P0±ΔP.

[0147] The disturbance pressure P0±ΔP can change the pressure in the flow channel groove 120, thereby changing the thrust of the gas in the flow channel groove 120, so that the thrust can act on the droplets 300 attached to the surface of the flow channel groove 120, so that the droplets 300 can flow in the flow channel groove 120, and then the droplets 300 can be discharged from the flow channel groove 120, thereby increasing the drainage performance of the flow channel groove 120. After t0 time, such as the fourth preset time, the heat dissipation capacity of the heat dissipation component is adjusted, and the disturbance pressure P0±ΔP is controlled to return to the working pressure P0.

[0148] In this way, by changing the heat dissipation capacity of the heat dissipation component, the working pressure in the groove can be changed, thereby realizing the adjustment of the working pressure in the flow channel groove 120, disturbing the material attached to the flow channel groove 120, and increasing the drainage performance of the flow channel groove 120.

[0149] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0150] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery plate, characterized in that: The surface of the battery plate has a plurality of flow channel ridges arranged at intervals, and the adjacent flow channel ridges are arranged to form flow channel grooves, and the flow channel grooves are recessed in the flow channel ridges; The flow channel ridge is used to abut against the membrane electrode assembly, and the flow channel groove is used to accommodate liquid water generated by the membrane electrode assembly and discharge the liquid water; The surface of the flow channel groove is subjected to hydrophilic treatment.

2. The battery plate according to claim 1, characterized in that: The flow channel groove comprises a bottom wall and two side walls, the two side walls are arranged opposite to each other, and the bottom wall is respectively connected to the two side walls; The flow channel groove includes any of the following features: In the first item, the bottom wall and the two side walls are both subjected to hydrophilic treatment; The second item, the bottom wall is subjected to a hydrophilic treatment, and one of the two side walls is subjected to a hydrophilic treatment; Thirdly, the bottom wall and the two side walls are subjected to hydrophilic treatment in sections.

3. The battery plate according to claim 1, characterized in that: Using laser processing to perform hydrophilic treatment on the surface of the flow channel groove; The laser processing can extend the flow channel groove by at least two scanning cycles, so that the side wall of the flow channel groove forms a stepped surface structure to guide the liquid water generated by the membrane electrode assembly to flow into the flow channel groove.

4. The battery plate according to claim 1, characterized in that: A hydrophilic coating is applied to the surface of the flow channel groove.

5. The battery plate according to any one of claims 1 to 4, characterized in that: The flow channel groove and the flow channel ridge extend in the longitudinal direction and at least penetrate the bottom of the battery plate.

6. A self-draining fuel cell, characterized in that: At least comprising a membrane electrode assembly, a control component and a battery plate as claimed in any one of claims 1 to 5; The battery plate comprises an anode plate and a cathode plate, and the membrane electrode assembly is arranged between the anode plate and the cathode plate; The control component is used to generate thrust in the flow channel groove of the battery plate to discharge liquid water in the flow channel groove.

7. The self-draining fuel cell according to claim 6, characterized in that The control component includes a controller and a control valve, wherein the control valve is connected to the air inlet end of the flow channel groove and is in communication with the controller; The controller can control the control valve to open or close so as to generate thrust in the flow channel groove.

8. The self-draining fuel cell according to claim 6, characterized in that The control component includes a controller and a heat dissipation component, wherein the heat dissipation component is arranged on the outside of the battery plate and is communicatively connected with the controller; The controller can adjust the heat dissipation capacity of the heat dissipation component to adjust the working pressure in the flow channel groove.

9. A drainage control method for a self-draining fuel cell, characterized in that: Applied to the self-draining fuel cell according to any one of claims 6 to 8, the drainage control method comprises the following steps: Obtaining control parameters in the flow channel groove; The flow channel groove is subjected to intermittent sudden disturbance control according to the control parameter to generate thrust in the flow channel groove.

10. The drainage control method according to claim 9, characterized in that: The control parameter is a pressure parameter, and intermittent sudden disturbance control is performed on the flow channel groove according to the control parameter, which at least includes the following steps: Obtaining the working pressure of the flow channel groove; After a first preset time, the working pressure is controlled to increase or decrease to form a disturbance pressure; After a second preset time has passed, controlling the disturbance pressure to return to the working pressure; or, The control parameter is a temperature parameter, and intermittent sudden disturbance control is performed on the flow channel groove according to the control parameter, which at least includes the following steps: Obtaining the working pressure of the flow channel groove; After a third preset time, the heat dissipation capacity of the heat dissipation component is adjusted to control the working pressure to be above or below, thereby forming a disturbance temperature; After a fourth preset time has passed, the disturbance pressure is controlled to return to the working pressure.

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