Negative plate, bipolar plate and battery

Abstract

The utility model relates to the field of batteries, and provides a cathode plate, a bipolar plate and a battery. The negative plate comprises a negative plate body, a flow channel is formed in the negative plate body, and a sunken section sunken towards the interior of the flow channel is formed on at least one side wall of the flow channel in the length direction of the flow channel. The negative plate can effectively increase fluid disturbance in the flow channel, so that convection occurs in a region below the flow channel and a region below a polar plate ridge, the distribution uniformity of reaction gas in a diffusion layer is improved, and the performance of the fuel cell is improved. And the transverse turbulent flow in the diffusion layer can take away liquid water accumulated in the pores, so that the water management capability of the fuel cell is enhanced, and the risk of water logging is reduced. In addition, compared with a wave-shaped flow channel structure, the pressure loss of airflow passing through the sunken section is small, the sunken section appropriately increases the pressure difference between an inlet and an outlet of the flow channel, and liquid water in the flow channel can be discharged easily.

Description

Technical Field

[0001] The utility model relates to the field of batteries and provides a cathode plate, a bipolar plate and a battery. Background Art

[0002] The bipolar plate is an important component of the fuel cell stack, and plays the role of conducting current, separating the reaction gas, providing the reaction gas and cooling water flow channel, and supporting the membrane electrode. The bipolar plate consists of a cathode plate and an anode plate. The flow channel structure of the cathode plate directly affects the water and heat management, performance and life of the fuel cell. Due to the important position of the cathode plate flow channel structure in the fuel cell stack, its design also puts forward high requirements. The gas mass transfer capacity and drainage capacity of the cathode plate are important indicators to measure its performance.

[0003] In the related art, the flow channel of the cathode plate is mainly divided into a straight flow channel and a wavy flow channel. The straight flow channel has low cost and is easy to process. The reaction gas mainly diffuses into the area below the flow channel through the concentration difference, and it is difficult to enter the area under the plate ridge, resulting in uneven electrochemical reaction on the surface of the catalyst layer and reduced battery performance. The wavy flow channel has a large pressure difference between the inlet and outlet, but too large a pressure difference will cause additional power burden. At the same time, the wavy flow channel also has the problem of difficulty in improving the uneven gas concentration in the area below the flow channel and the area under the plate ridge. Utility Model Content

[0004] The embodiment of the utility model provides a cathode plate to solve the defect in the related art that the flow channel of the cathode plate is difficult to improve the problem of uneven gas concentration in the area below the flow channel and the area under the plate ridge, which can improve the uniformity of reaction gas distribution in the diffusion layer and improve the performance of the fuel cell.

[0005] The embodiment of the utility model also provides a bipolar plate.

[0006] The embodiment of the utility model also provides a battery.

[0007] The first aspect of the utility model provides a cathode plate, including a cathode plate body, on which a flow channel is formed, and along the length direction of the flow channel, a recessed section recessed toward the inside of the flow channel is formed on at least one side wall of the flow channel.

[0008] According to an embodiment of the present invention, there are a plurality of the recessed sections, and the plurality of the recessed sections are arranged at intervals along the length direction of the flow channel, and a straight section is formed between two adjacent recessed sections.

[0009] According to an embodiment of the present invention, the intervals between two adjacent recessed sections are equal.

[0010] According to an embodiment of the present utility model, the flow channel includes a first side wall and a second side wall that are arranged opposite to each other, and the recessed section is formed in at least one of the first side wall and the second side wall.

[0011] According to an embodiment of the present invention, when the recessed sections are formed on the first side wall and the second side wall, the recessed sections formed on the first side wall and the second side wall are staggered along the length direction of the flow channel.

[0012] According to an embodiment of the utility model, along the air intake direction of the flow channel, the recessed section includes a first recessed portion and a second recessed portion connected to each other, and a curvature radius of the first recessed portion is smaller than a curvature radius of the second recessed portion.

[0013] According to an embodiment of the present invention, the length of the recessed section is equal to the length of the straight section.

[0014] According to one embodiment of the utility model, an intake manifold and an exhaust manifold are formed on the cathode plate body, the intake manifold and the intake port of the flow channel are suitable for fluid communication through the intake distribution area, and the exhaust manifold and the exhaust port of the flow channel are suitable for fluid communication through the exhaust distribution area.

[0015] A second aspect of the present invention provides a bipolar plate, comprising the above-mentioned cathode plate.

[0016] A third aspect of the present invention provides a battery, comprising the above-mentioned cathode plate, or the above-mentioned bipolar plate.

[0017] According to the cathode plate provided by the embodiment of the first aspect of the utility model, by forming a concave section that is concave toward the inside of the flow channel on the flow channel side wall of the cathode plate body, such a design can effectively increase the fluid disturbance in the flow channel. At the same time, the setting of the concave section also forms a pressure difference between the flow channels, so that convection occurs in the area below the flow channel and the area under the plate ridge, improving the uniformity of the distribution of the reaction gas in the diffusion layer and improving the performance of the fuel cell. The lateral disturbance in the diffusion layer can take away the liquid water accumulated in the pores, enhance the water management ability of the fuel cell, and reduce the risk of flooding. In addition, compared with the wavy flow channel structure, the pressure loss of the airflow passing through the concave section is smaller, and the concave section appropriately increases the pressure difference between the inlet and outlet of the flow channel, which is conducive to the discharge of liquid water in the flow channel. At the same time, the pressure drop of the flow channel structure is lower than that of the wavy structure flow channel, which can reduce the power loss of the fuel cell system and improve the effective output power. The presence of the concave section increases the surface area of ​​the flow channel wall and increases the contact area between the fluid and the wall, which is conducive to the heat exchange between the fluid and the flow channel wall, thereby improving the heat transfer performance of the entire cathode plate system. The design of the recessed section can be flexibly adjusted according to actual needs, such as quantity, position, size and shape, to adapt to different fluid flow conditions and process requirements, thereby optimizing the flow channel structure and improving the performance and efficiency of the cathode plate. Although the recessed section increases the disturbance in the flow channel, a reasonable design can keep the fluid at a relatively stable flow rate and pressure when flowing through the recessed section, so that the pressure drop of the flow channel is maintained within a reasonable range. By optimizing the flow channel structure and improving the heat transfer performance, the manufacturing is relatively simple and does not require complex processes and equipment.

[0018] According to the bipolar plate provided by the embodiment of the second aspect of the utility model, since the bipolar plate includes the above-mentioned cathode plate, its overall performance is significantly improved. The introduction of the recessed section enhances the flow efficiency and mass transfer and heat transfer performance of the fluid, so that the bipolar plate can more efficiently transfer substances and exchange energy during the electrochemical reaction. Due to the design of the recessed section, the pressure drop of the flow channel is maintained within a reasonable range. By optimizing the flow channel structure and improving the mass transfer and heat transfer performance, the bipolar plate can maintain a more uniform operating state during the electrochemical reaction. This helps to reduce performance degradation and damage caused by uneven reaction rate on the catalyst layer, and extend the service life of the entire electrochemical system.

[0019] According to the battery provided by the third embodiment of the utility model, by providing the above-mentioned cathode plate or the above-mentioned bipolar plate, the uniformity of the electrochemical reaction rate and the heat transfer performance inside the battery are significantly improved, thereby improving the overall performance of the battery. The optimized flow channel structure and mass transfer and heat transfer performance enable the battery to maintain a more stable operating state during operation. This helps to reduce the performance degradation and damage caused by the uneven reaction rate on the catalyst layer, and improves the reliability and durability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic front view of the cathode plate provided by the utility model.

[0022] Figure 2 It is a schematic enlarged diagram of the flow channel provided by the utility model.

[0023] Figure 3 It is a schematic structural diagram of mass transfer inside the flow channel provided by the utility model.

[0024] Figure 4 It is a schematic structural diagram of a flow channel provided by the utility model.

[0025] Figure 5 It is a schematic structural diagram of another flow channel provided by the utility model.

[0026] Figure 6 It is a schematic view of the outline of the recessed section provided by the utility model.

[0027] Reference numerals:

[0028] 100, cathode plate body; 102, flow channel; 104, recessed section; 106, straight section; 108, first side wall; 110, second side wall; 112, first recessed portion; 114, second recessed portion; 116, intake manifold; 118, exhaust manifold; 120, intake distribution area; 122, exhaust distribution area. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0030] like Figures 1 to 6 As shown, the first embodiment of the utility model provides a cathode plate, including a cathode plate body 100, on which a flow channel 102 is formed, and along the length direction of the flow channel 102, a recessed section 104 recessed toward the interior of the flow channel 102 is formed on at least one side wall of the flow channel 102.

[0031] According to the cathode plate provided by the embodiment of the first aspect of the utility model, by forming a recessed section 104 recessed toward the inside of the flow channel 102 on the side wall of the flow channel 102 of the cathode plate body 100, such a design can effectively increase the fluid disturbance in the flow channel 102. At the same time, the setting of the recessed section 104 also forms a pressure difference between adjacent flow channels 102, so that convection occurs in the area below the flow channel 102 and the area under the plate ridge, improving the uniformity of the distribution of the reaction gas in the diffusion layer and improving the performance of the fuel cell. The lateral disturbance in the diffusion layer can take away the liquid water accumulated in the pores, enhance the water management ability of the fuel cell, and reduce the risk of flooding. In addition, compared with the wavy flow channel structure, the pressure loss of the airflow passing through the recessed section is small, and the recessed section 104 appropriately increases the pressure difference between the inlet and outlet of the flow channel 102, which is conducive to the discharge of liquid water in the flow channel 102. At the same time, the pressure drop of the flow channel 102 structure is lower than that of the wavy structure flow channel 102, which can reduce the power loss of the fuel cell system and improve the effective output power. The presence of the recessed section 104 increases the surface area of ​​the wall of the flow channel 102 and increases the contact area between the fluid and the wall, which is beneficial to the heat exchange between the fluid and the wall of the flow channel 102, thereby improving the heat transfer performance of the entire cathode plate system. The design of the recessed section 104 can be flexibly adjusted according to actual needs, such as quantity, position, size and shape, to adapt to different fluid flow conditions and process requirements, thereby optimizing the structure of the flow channel 102 and improving the performance and efficiency of the cathode plate. Although the recessed section 104 increases the disturbance in the flow channel 102, a reasonable design can keep the fluid at a relatively stable flow rate and pressure when flowing through the recessed section 104, so that the pressure drop of the flow channel is maintained within a reasonable range. By optimizing the structure of the flow channel 102 and improving the heat transfer performance, it is relatively simple to manufacture and does not require complex processes and equipment.

[0032] Please continue to see Figures 1 to 6 The first embodiment of the utility model provides a cathode plate, which is mainly composed of a cathode plate body 100, and a flow channel 102 for circulating gas is formed on the cathode plate body 100.

[0033] The cathode plate body 100 is the main component of the entire cathode plate, and is usually made of a material with good electrical conductivity, such as a metal plate, a graphite plate, etc. The shape and size of the cathode plate body 100 can be customized according to actual application requirements to adapt to different electrochemical equipment and process flows.

[0034] The cathode plate body 100 is provided with flow channels 102. The main function of these flow channels 102 is to guide the fluid (such as the reaction gas) to flow inside the cathode plate to achieve the transfer of substances and the exchange of energy. The shape and size of the flow channels 102 are also designed according to the actual application requirements to ensure that the fluid can flow through the cathode plate evenly and stably.

[0035] Along the length direction of the flow channel 102, a concave section 104 is formed on at least one side wall of the flow channel 102, which is concave toward the inside of the flow channel 102. This is one of the key innovations of the present invention. The design of the concave section 104 can effectively increase the surface area inside the flow channel 102, increase the contact area between the fluid and the cathode plate, and thus enhance the heat transfer effect between the fluid and the wall of the flow channel 102. At the same time, the concave section 104 can also cause turbulence in the fluid, thereby improving the mixing effect and flow efficiency of the fluid.

[0036] More importantly, the provision of the recessed section 104 can effectively improve the mass transfer capacity of the reaction gas, and also make it easier to discharge the liquid water in the gas diffusion layer and the flow channel 102. This forms a pressure difference between the flow channels 102, forcing convection to occur in the area below the flow channel 102 and the area under the plate ridge, improving the uniformity of the distribution of the reaction gas in the diffusion layer and improving the performance of the fuel cell. In addition, the lateral disturbance in the diffusion layer can carry away the liquid water accumulated in the pores, enhance the water management ability of the fuel cell, and reduce the risk of flooding. Moreover, the pressure loss of the airflow through the streamlined recessed section 104 is small. Compared with the straight channel 102 structure, the streamlined recessed section 104 appropriately increases the pressure difference between the inlet and outlet of the flow channel 102, which is conducive to the discharge of liquid water in the flow channel 102. At the same time, the pressure drop of the flow channel 102 structure is lower than that of the wave-shaped structure flow channel 102, which can reduce the power loss of the fuel cell system and improve the effective output power.

[0037] The shape, number, position and size of the recessed section 104 can be flexibly adjusted according to actual application requirements. For example, the recessed sections 104 of different shapes (such as circular, elliptical, rectangular, etc.) can be designed to adapt to different fluid flow conditions; the number of recessed sections 104 can be increased or decreased to adjust the flow speed and mixing effect of the fluid; the position and size of the recessed section 104 can be changed to adapt to different process flows and equipment requirements.

[0038] In summary, the cathode plate provided in the embodiment of the first aspect of the utility model significantly improves the mass transfer and heat transfer performance of the cathode plate by introducing the recessed section 104, enhances the mixing effect and flow efficiency of the fluid, and provides strong support for the performance improvement and process optimization of the electrochemical equipment.

[0039] According to an embodiment of the present invention, there are a plurality of recessed sections 104 , which are spaced apart along the length direction of the flow channel 102 , and a straight section 106 is formed between two adjacent recessed sections 104 .

[0040] See also Figure 2Along the length direction of the flow channel 102, a plurality of concave sections 104 are formed on the side wall of the flow channel 102, which are concave toward the inside of the flow channel 102. These concave sections 104 are not arranged continuously, but between two adjacent concave sections 104, the side wall of the flow channel 102 remains straight, forming a so-called straight section 106. It can be understood that the straight section 106 mentioned here refers to the inner section of the flow channel 102 being a segment with equal diameter.

[0041] The design of the recessed section 104 is intended to enhance the turbulent effect of the fluid and improve the mixing and mass transfer efficiency of the fluid. The design of the straight section 106 ensures the stable flow of the fluid in the flow channel 102, avoiding energy loss and noise problems that may be caused by excessive turbulence. The combination of the recessed section 104 and the straight section 106 arranged at intervals can effectively enhance the mixing effect of the fluid and maintain the stable flow of the fluid, achieving a balance between fluid flow efficiency and energy consumption.

[0042] The arrangement of multiple recessed sections 104 increases the turbulence intensity in the flow channel 102, allowing the fluid to be more fully mixed in the flow channel 102, thereby improving the mass transfer efficiency. This is crucial for the transfer of substances during the electrochemical reaction process and helps to improve the reaction rate and efficiency. The design of the straight section 106 between two adjacent recessed sections 104 ensures the stable flow of the fluid in the flow channel 102. This helps to reduce the pressure loss of the fluid in the flow channel 102 and reduce energy consumption.

[0043] According to an embodiment of the present invention, the intervals between two adjacent recessed sections 104 are equal.

[0044] See also Figure 2 , the distribution of the recessed sections 104 on the flow channel 102 is not random, but the intervals between two adjacent recessed sections 104 are equal. This design of equally spaced recessed sections 104 ensures that the disturbance and turbulence effects of the fluid flowing in the flow channel 102 are evenly distributed. By precisely controlling the intervals of the recessed sections 104, the flow characteristics of the fluid can be precisely controlled to meet the requirements of different processes for fluid mixing and mass transfer efficiency.

[0045] According to an embodiment of the present invention, the flow channel 102 includes a first side wall 108 and a second side wall 110 that are oppositely disposed, and the recessed section 104 is formed in at least one of the first side wall 108 and the second side wall 110 .

[0046] See also Figure 4 and Figure 5In the embodiment of the utility model, the recessed section 104 can be formed only on the first side wall 108, or only on the second side wall 110, or on both the first side wall 108 and the second side wall 110. The recessed section 104 is recessed toward the inside of the flow channel 102, which increases the surface area in the flow channel 102, helps to enhance the turbulent effect of the fluid, and improves the mixing efficiency and mass transfer performance of the fluid.

[0047] By forming the recessed section 104 on the first side wall 108 or the second side wall 110, the flow of the fluid in the flow channel 102 can be more accurately controlled. This design can adjust the flow rate, flow direction and distribution of the fluid to adapt to different process requirements and reaction conditions. By forming the recessed section 104 on the first side wall 108 and the second side wall 110, the contact area between the fluid and the cathode plate can be increased, thereby improving the heat exchange performance.

[0048] According to an embodiment of the present invention, when the recessed section 104 is formed on the first side wall 108 and the second side wall 110 , the recessed sections 104 formed on the first side wall 108 and the second side wall 110 are staggered along the length direction of the flow channel 102 .

[0049] See also Figure 5 In this embodiment, the recessed section 104 is formed not only on the first side wall 108 , but also on the second side wall 110 . However, the recessed sections 104 on these two side walls are not directly corresponding to each other, but are staggered along the length direction of the flow channel 102 .

[0050] Specifically, when the fluid flows in the flow channel 102, it first encounters a recessed section 104 on the first side wall 108, and then encounters a recessed section 104 on the second side wall 110 at a different position during the flow process. The recessed sections 104 arranged in such a staggered manner make the flow of the fluid in the flow channel 102 more complex and varied, which helps to enhance the turbulent effect of the fluid and improve the mixing and mass transfer efficiency.

[0051] Since the recessed sections 104 on the first side wall 108 and the second side wall 110 are staggered, the flow path of the fluid in the flow channel 102 becomes more complex and changeable. This complex flow path makes it easier for the fluid to generate turbulence and eddy currents, thereby increasing the amount of reactant gas entering the diffusion layer and the catalytic layer. Although the design of the recessed sections 104 increases the turbulent effect in the flow channel 102, since they are staggered, the flow of the fluid in the flow channel 102 still maintains a certain stability. This stability helps to ensure that the pressure drop of the fluid in the flow channel 102 is maintained within a reasonable range. At the same time, by staggering the streamlined recessed sections 104 on the sides of adjacent flow channels 102, a pressure difference is formed between the flow channels 102, forcing convection to occur in the area below the flow channel 102 and the area under the plate ridge, thereby improving the uniformity of the distribution of the reactant gas in the diffusion layer and improving the performance of the fuel cell. In addition, the lateral disturbance in the diffusion layer can carry away the liquid water accumulated in the pores, enhancing the water management capability of the fuel cell and reducing the risk of flooding.

[0052] According to an embodiment of the present invention, along the air intake direction of the flow channel 102 , the recessed section 104 includes a first recessed portion 112 and a second recessed portion 114 connected to each other, and the curvature radius of the first recessed portion 112 is smaller than the curvature radius of the second recessed portion 114 .

[0053] See also Figure 6 Along the air inlet direction of the flow channel 102, the recessed section 104 is designed to include a first recessed portion 112 and a second recessed portion 114 connected to each other. The two portions are different not only in shape but also in curvature radius, wherein the curvature radius R1 of the first recessed portion 112 is smaller than the curvature radius R2 of the second recessed portion 114.

[0054] The purpose of this design is to further influence and control the flow state of the fluid in the flow channel 102 by changing the shape and radius of curvature of the recessed section 104. When the fluid enters the recessed section 104, it will first encounter the first recessed portion 112 with a smaller radius of curvature, where the fluid flow will be greatly affected, generating strong turbulence and eddies. Subsequently, the fluid enters the second recessed portion 114 with a larger radius of curvature, where the flow state is relatively gentle, but still maintains a certain turbulent effect. Since the radius of curvature of the first recessed portion 112 is small, the fluid will generate strong turbulence and eddies here, thereby increasing the reaction gas entering the diffusion layer and the catalyst layer.

[0055] In addition, if Figure 6 As shown, by adjusting the parameters such as L1, L2, H, etc., the size of the recessed section 104 can also be adjusted, thereby achieving parameter adjustment of the flow channel 102.

[0056] The reaction gas is squeezed by the wall in the first recess 112, and the flow velocity increases and the pressure decreases along the way. The reaction gas gradually increases in the flow area of ​​the second recess 114, the flow velocity decreases along the way, and the pressure increases along the way. Therefore, when the gas flows through the uniform section in front of the first recess 112, the resistance to continue flowing forward is relatively large at this time, and the adjacent flow channel 102 corresponds to the second recess 114, and the resistance is relatively small, so part of the gas will enter the adjacent flow channel 102 through the gas diffusion layer, resulting in the formation of airflow between the area below the flow channel 102 and the area under the plate ridge, the gas concentration in the area under the plate ridge increases, and the gas distribution on the entire diffusion layer is more uniform. At the same time, along with the cross-channel flow of the reaction gas, the liquid water that is difficult to discharge under the plate ridge will be taken away in this process, reducing the risk of battery flooding.

[0057] According to an embodiment of the present invention, the length of the concave section 104 is equal to the length of the straight section 106 .

[0058] See also Figure 2 The concave section 104 is a portion of the side wall of the flow channel 102 that is concave toward the inside of the flow channel 102, and its length is consistent with the length of the straight section 106 on the side wall of the flow channel 102 that is not concave. This design makes the flow channel 102 present an alternating pattern in the length direction, that is, the concave section 104 and the straight section 106 appear alternately, and the lengths of the two are equal. This alternating change not only ensures the stability of the overall structure of the flow channel 102 and the continuity of the fluid flow, but also further affects the flow state and mass transfer effect of the fluid in the flow channel 102 through the alternating action of the concave section 104 and the straight section 106.

[0059] Since the lengths of the concave section 104 and the straight section 106 are equal, the fluid can alternately experience the turbulent flow brought by the concave section 104 and the laminar flow brought by the straight section 106 when flowing in the flow channel 102, thereby achieving the diversity of fluid flow. This diverse flow state helps to reduce the pressure loss of the fluid in the flow channel 102, reduce energy consumption, and optimize fluid dynamics performance.

[0060] According to one embodiment of the utility model, an intake manifold 116 and an exhaust manifold 118 are formed on the cathode plate body 100. The intake manifold 116 and the intake port of the flow channel 102 are suitable for fluid communication through the intake distribution area 120, and the exhaust manifold 118 and the exhaust port of the flow channel 102 are suitable for fluid communication through the exhaust distribution area 122.

[0061] See also Figure 1 The cathode plate body 100 is not only formed with a flow channel 102 , but also designed with an intake manifold 116 and an exhaust manifold 118 and an intake distribution area 120 and an exhaust distribution area 122 connected thereto.

[0062] The intake manifold 116 is designed to provide fluid to the flow channel 102, and it is in fluid communication with the intake port of the flow channel 102 through the intake distribution area 120. The function of the intake distribution area 120 is to evenly distribute the fluid entering from the intake manifold 116 to the intake port of the flow channel 102, to ensure that the fluid can evenly enter the flow channel 102, and to avoid the problem of uneven fluid distribution. Similarly, the exhaust manifold 118 is designed to discharge fluid from the flow channel 102, and it is in fluid communication with the exhaust port of the flow channel 102 through the exhaust distribution area 122. The function of the exhaust distribution area 122 is to effectively guide the fluid discharged from the exhaust port of the flow channel 102 to the exhaust manifold 118, to ensure that the fluid can be discharged smoothly, and to avoid the accumulation or backflow of the fluid in the flow channel 102.

[0063] The design of the air intake manifold 116 and the air intake distribution area 120 can ensure that the fluid can enter the flow channel 102 uniformly, avoiding the problem of uneven fluid distribution. This helps to achieve uniform mixing and mass transfer of the fluid in the flow channel 102, improving reaction efficiency and product quality. The design of the exhaust manifold 118 and the exhaust distribution area 122 can ensure that the fluid can be discharged smoothly from the flow channel 102, avoiding the problem of fluid accumulation or backflow in the flow channel 102. This helps to keep the flow channel 102 unobstructed and avoid the degradation of electrochemical performance caused by water blockage in the flow channel 102.

[0064] A second aspect of the present invention provides a bipolar plate, comprising the above-mentioned cathode plate.

[0065] According to the bipolar plate provided by the embodiment of the second aspect of the utility model, since the bipolar plate includes the above-mentioned cathode plate, its overall performance is significantly improved. The introduction of the recessed section 104 enhances the flow efficiency and mass transfer and heat transfer performance of the fluid, so that the bipolar plate can more efficiently transfer substances and exchange energy during the electrochemical reaction. Due to the design of the recessed section 104, the pressure drop of the flow channel 102 is maintained within a reasonable range. By optimizing the structure of the flow channel 102 and improving the mass transfer and heat transfer performance, the bipolar plate can maintain a more uniform operating state during the electrochemical reaction. This helps to reduce performance degradation and damage caused by uneven reaction rates on the catalyst layer and extend the service life of the entire electrochemical system.

[0066] A third aspect of the present invention provides a battery, comprising the above-mentioned cathode plate, or the above-mentioned bipolar plate.

[0067] According to the battery provided by the third embodiment of the utility model, by providing the above-mentioned cathode plate or the above-mentioned bipolar plate, the uniformity of the electrochemical reaction rate and the heat transfer performance inside the battery are significantly improved, thereby improving the overall performance of the battery. The optimized flow channel 102 structure and mass transfer and heat transfer performance enable the battery to maintain a more stable operating state during operation. This helps to reduce the performance degradation and damage caused by the uneven reaction rate on the catalyst layer, and improves the reliability and durability of the battery.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A cathode plate, characterized in that: The invention comprises a cathode plate body (100), on which a flow channel (102) is formed, and along the length direction of the flow channel (102), a recessed section (104) recessed toward the inside of the flow channel (102) is formed on at least one side wall of the flow channel (102).

2. The cathode plate according to claim 1, characterized in that: There are a plurality of the recessed sections (104), and the plurality of recessed sections (104) are arranged at intervals along the length direction of the flow channel (102), and a straight section (106) is formed between two adjacent recessed sections (104).

3. The cathode plate according to claim 2, characterized in that: The intervals between two adjacent recessed sections (104) are equal.

4. The cathode plate according to claim 2, characterized in that: The flow channel (102) comprises a first side wall (108) and a second side wall (110) which are arranged opposite to each other, and the recessed section (104) is formed in at least one of the first side wall (108) and the second side wall (110).

5. The cathode plate according to claim 4, characterized in that: When the recessed section (104) is formed on the first side wall (108) and the second side wall (110), the recessed sections (104) formed on the first side wall (108) and the second side wall (110) are staggered along the length direction of the flow channel (102).

6. The cathode plate according to any one of claims 1 to 5, characterized in that: Along the air intake direction of the flow channel (102), the recessed section (104) comprises a first recessed portion (112) and a second recessed portion (114) which are connected to each other, and the curvature radius of the first recessed portion (112) is smaller than the curvature radius of the second recessed portion (114).

7. The cathode plate according to any one of claims 2 to 5, characterized in that: The length of the recessed section (104) is equal to the length of the straight section (106).

8. The cathode plate according to any one of claims 1 to 5, characterized in that: An intake manifold (116) and an exhaust manifold (118) are formed on the cathode plate body (100); the intake manifold (116) and the intake port of the flow channel (102) are suitable for fluid communication through an intake distribution area (120); and the exhaust manifold (118) and the exhaust port of the flow channel (102) are suitable for fluid communication through an exhaust distribution area (122).

9. A bipolar plate, characterized in that: Comprising the cathode plate according to any one of claims 1 to 8.

10. A battery, characterized in that: The method comprises the cathode plate according to any one of claims 1 to 8, or the bipolar plate according to claim 9.

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