Monopolar plate, bipolar plate and fuel cell

Abstract

The utility model discloses a monopolar plate, a bipolar plate and a fuel cell, the monopolar plate comprises a plate body provided with a flow field area and cavity opening areas, the flow field area comprises a plurality of reaction areas distributed at intervals along a first direction and / or a second direction, the cavity opening areas comprise a first cavity opening area and a second cavity opening area, the first cavity opening area is located at one side, facing the edge of the plate body, of each reaction area, and the second cavity opening area is located at one side, facing the edge of the plate body, of each reaction area. The second cavity opening area is located between the two adjacent reaction areas, and the first cavity opening area is communicated with the second cavity opening area through the reaction areas to form a fluid circulation channel, so that the distribution uniformity of the fluid in the reaction areas is improved. The first cavity opening area and / or the second cavity opening area further comprises a hydrogen inlet / outlet, an air inlet / outlet and a cooling liquid inlet / outlet, the area S1 of the hydrogen inlet / outlet, the area S2 of the air inlet / outlet and the area S3 of the cooling liquid inlet / outlet meet the conditions that S2 is larger than or equal to 2 * S1, and S3 is larger than or equal to 2 * S1, so that the reaction efficiency of fluid in the reaction area and the heat dissipation efficiency of the monopolar plate are improved; therefore, the service life of the monopolar plate is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and in particular to a monopolar plate, a bipolar plate and a fuel cell. Background Art

[0002] Fuel cells, as an energy conversion device that converts chemical energy into electrical energy, are widely used in new energy vehicles, backup power supplies, distributed power generation and other fields. Among them, the bipolar plate is one of the core components of the fuel cell, which has the functions of collecting current, supporting membrane electrodes and evenly distributing fluids. As the requirements for the working performance and economic performance of fuel cells continue to increase, bipolar plates have begun to develop in the direction of large-scale development in order to increase the reaction area and improve the reaction efficiency, thereby improving the working performance of the fuel cell.

[0003] At present, large-scale bipolar plates in the existing technology have risks such as uneven fluid distribution and overheating in local areas, resulting in poor performance of the fuel cell. Utility Model Content

[0004] In view of this, the present application provides a monopolar plate, a bipolar plate and a fuel cell to solve the technical problem in the prior art that large-scale bipolar plates lead to poor working performance of the fuel cell.

[0005] The present application provides a monopolar plate, which includes a plate body, and the plate body is provided with a flow field area and a cavity area; the flow field area includes a plurality of reaction areas, and the plurality of reaction areas are distributed at intervals along a first direction and / or a second direction; the cavity area includes a first cavity area and a second cavity area, and along the first direction and / or the second direction, the first cavity area is located on the side of each reaction area facing the edge of the plate body, and the second cavity area is located between two adjacent reaction areas.

[0006] Wherein, the first cavity port area is connected with the second cavity port area through the reaction zone to form a fluid flow channel; the first cavity port area and / or the second cavity port area also include a hydrogen inlet and an air inlet and an air outlet, and a coolant inlet and an outlet, the hydrogen inlet and the outlet include a hydrogen inlet and a hydrogen outlet, and the sum of the area of ​​the hydrogen inlet and the area of ​​the hydrogen outlet is S1; the air inlet and the outlet include an air inlet and an air outlet, and the sum of the area of ​​the air inlet and the area of ​​the air outlet is S2; the coolant inlet and the outlet include a coolant inlet and a coolant outlet, and the sum of the area of ​​the coolant inlet and the area of ​​the coolant outlet is S3, and S1, S2 and S3 satisfy: S2≥2×S1, S3≥2×S1.

[0007] In the embodiment of the present application, by setting the first cavity area, the second cavity area and the multiple reaction areas distributed at intervals, the flow of the fluid in the plate body can be shortened, and the uniformity of the distribution of the fluid in the reaction area can be improved, thereby achieving the purpose of reducing the flow pressure drop of the monopolar plate and improving the working performance and area utilization of the monopolar plate. In addition, by setting the area ratio between the hydrogen inlet and outlet, the air inlet and outlet and the cooling inlet and outlet, the reaction efficiency of the fluid in the reaction area and the heat dissipation efficiency of the monopolar plate can be improved, so that the monopolar plate can have a stable thermal balance during the working process, thereby improving the working performance of the monopolar plate while reducing the possibility of overheating and damage to the monopolar plate, which is conducive to extending the service life of the monopolar plate.

[0008] In a possible embodiment, the reaction zone includes a first reaction zone and a second reaction zone. When the first reaction zone and the second reaction zone are spaced apart along a first direction, one of the hydrogen inlet and the air inlet is located in the first cavity port area, and the other is located in the second cavity port area. Along the first direction and the second direction, the hydrogen inlet and the hydrogen outlet, the air inlet and the air outlet are diagonally distributed relative to the first reaction zone and the second reaction zone. One of the coolant inlet and the coolant outlet is located in the first cavity port area, and the other is located in the second cavity port area. The coolant inlet and the coolant outlet are distributed on both sides of the first reaction zone and the second reaction zone along the first direction.

[0009] In a possible embodiment, the reaction zone includes a first reaction zone and a second reaction zone, when the first reaction zone and the second reaction zone are spaced apart along the second direction, the hydrogen inlet and the air inlet are both located in the first cavity area and are distributed on both sides of the flow field area along the first direction, and along the first direction and the second direction, the hydrogen inlet and the hydrogen outlet, the air inlet and the air outlet are diagonally distributed relative to the first reaction zone and the second reaction zone; one of the coolant inlet and the coolant outlet is located in the first cavity area, and the other is located in the second cavity area, and the coolant inlet and the coolant outlet are distributed on both sides of the first reaction zone and the second reaction zone along the second direction.

[0010] In a possible embodiment, the flow field area includes a first reaction zone, a second reaction zone, a third reaction zone and a fourth reaction zone, and the first reaction zone, the second reaction zone, the third reaction zone and the fourth reaction zone are distributed at intervals along the first direction and the second direction.

[0011] In a possible implementation, one of the hydrogen inlet and the air inlet is located in the first cavity port area, and the other is located in the second cavity port area, and along the first direction and the second direction, the hydrogen inlet and the hydrogen outlet, and the air inlet and the air outlet are diagonally distributed relative to each of the reaction zones; one of the coolant inlet and the coolant outlet is located in the first cavity port area, and the other is located in the second cavity port area, and the coolant inlet and the coolant outlet are distributed on both sides of each of the reaction zones along the second direction.

[0012] In a possible implementation, one of the hydrogen inlet and the air inlet is located in the first cavity port area, and the other is located in the second cavity port area, and along the first direction and the second direction, the hydrogen inlet and the hydrogen outlet, the air inlet and the air outlet are diagonally distributed relative to each of the reaction zones; one of the coolant inlet and the coolant outlet is located in the first cavity port area, and the other is located in the second cavity port area, and the coolant inlet and the coolant outlet are distributed on both sides of each of the reaction zones along the first direction.

[0013] The plate body is also provided with a convex rib, and along the second direction, the convex rib is located between two adjacent reaction zones, and along the first direction, at least one end of the convex rib is flush with the end of each of the reaction zones, or at least one end of the convex rib protrudes at least a partial distance relative to the end of each of the reaction zones.

[0014] In a possible implementation manner, in the first cavity region, the area S1 of the hydrogen inlet and outlet satisfies 0.5 cm 2 ≤S1≤10cm 2 The area S2 of the air inlet and outlet meets 1cm 2 ≤S2≤40cm 2 The area S3 of the coolant inlet and outlet meets 1cm 2 ≤S3≤40cm 2 .

[0015] In a possible implementation manner, in the second cavity region, the area S1 of the hydrogen inlet and outlet meets 1 cm 2 ≤S1≤20cm 2 The area S2 of the air inlet and outlet meets 4cm 2 ≤S2≤160cm 2 The area S3 of the coolant inlet and outlet meets 2cm 2 ≤S3≤80cm 2 .

[0016] In a possible implementation, the number of the reaction zones is N, and N satisfies 2≤N≤8, and the area of ​​each reaction zone is S4, and S4 satisfies 50cm 2 ≤S4≤500cm 2 .

[0017] The present application also provides a bipolar plate, which includes an anode plate and a cathode plate that are stacked, and the anode plate and the cathode plate are both made of the monopolar plate described in any one of the above items; wherein the hydrogen inlet and outlet are connected to the flow field area of ​​the anode plate to form a hydrogen flow channel; the air inlet and outlet are connected to the flow field area of ​​the cathode plate to form an air flow channel; the coolant inlet and outlet are connected to the space between the anode plate and the cathode plate to form a coolant flow channel.

[0018] In the embodiment of the present application, by setting a first cavity area, a second cavity area and multiple reaction areas, it is beneficial to shorten the flow of the fluid in each reaction area, improve the stability of the fluid flow in the bipolar plate and the uniformity of distribution, thereby reducing the flow resistance and pressure loss of the fluid during the flow process, thereby improving the reaction efficiency of the gas in the reaction area, improving the cooling effect of the coolant on the bipolar plate, and increasing the area ratio of the reaction area on the plate body, thereby improving the area utilization rate of the plate body.

[0019] The present application also provides a fuel cell, which includes a stacked membrane electrode assembly and a bipolar plate, and the bipolar plate is the bipolar plate described above.

[0020] In the embodiment of the present application, during the operation of the fuel cell, hydrogen can flow into the reaction zone on the anode side of the bipolar plate through the hydrogen inlet for reaction, and the unreacted hydrogen can flow out of the bipolar plate through the hydrogen outlet; air can flow into the reaction zone on the cathode side of the bipolar plate through the air inlet for reaction, and the unreacted air and water generated by the reaction can flow out of the bipolar plate through the air outlet.

[0021] Among them, by setting a first cavity area, a second cavity area and a plurality of reaction areas distributed at intervals on the bipolar plate, the area ratio of the reaction area on the plate body can be increased, and the area utilization rate of the plate body can be improved, which is beneficial to improving the reaction efficiency inside the fuel cell, thereby improving the overall output power and further improving the energy density generated by the fuel cell.

[0022] At the same time, there is a shared second cavity area between two adjacent reaction areas, which can improve the flow distribution of gas and coolant in the plate body, which is beneficial to improving the uniformity of fluid flow, thereby further improving the reaction efficiency inside the fuel cell.

[0023] In addition, having a shared second cavity area between two adjacent reaction zones can also improve the thermal conductivity of the plate body, ensure that the temperature distribution between multiple monopolar plates is relatively uniform, and help reduce the possibility of local overheating of the plate body, thereby improving the working performance of the plate body while extending the service life of the plate body and ensuring the stability and reliability of the fuel cell during operation.

[0024] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 This is a schematic diagram of the structure of the monopolar plate basic structure unit provided in this application;

[0027] Figure 2 This is a schematic structural diagram of the monopolar plate provided in the present application in a first embodiment;

[0028] Figure 3 This is a schematic structural diagram of the monopolar plate provided in the present application in a second embodiment;

[0029] Figure 4 This is a schematic structural diagram of the monopolar plate provided in the present application in the third embodiment;

[0030] Figure 5 This is a schematic structural diagram of the monopolar plate provided in the present application in a fourth embodiment;

[0031] Figure 6 A comparison chart of the performance of the monopolar plate provided in this application and the existing monopolar plate;

[0032] Figure 7 A comparison chart of the voltage drop of the monopolar plate provided in this application and the existing monopolar plate;

[0033] Figure 8 A comparison chart of the area utilization of the monopolar plate provided in this application and the existing monopolar plate.

[0034] Description of reference numerals:

[0035] 1-Plate body;

[0036] 11-Flow field area;

[0037] 111-first reaction zone;

[0038] 112-second reaction zone;

[0039] 113-third reaction zone;

[0040] 114- fourth reaction zone;

[0041] 12-cavity opening area;

[0042] 121-first cavity opening area;

[0043] 122-second cavity opening area;

[0044] 123-Hydrogen inlet;

[0045] 124- hydrogen outlet;

[0046] 125-air inlet;

[0047] 126-air outlet;

[0048] 127-Coolant inlet;

[0049] 128-coolant outlet;

[0050] 13-Convex ribs.

[0051] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0052] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0053] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0054] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0055] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0056] The embodiment of the present application provides a monopolar plate, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the monopolar plate includes a plate body 1 , and the plate body 1 is provided with a flow field area 11 and a cavity area 12 .

[0057] The flow field area 11 includes a plurality of reaction areas, and the plurality of reaction areas are spaced apart along the first direction x and / or the second direction y. The cavity area 12 includes a first cavity area 121 and a second cavity area 122. Along the first direction x and / or the second direction y, the first cavity area 121 is located on one side of each reaction area facing the edge of the plate body 1, and the second cavity area 122 is located between two adjacent reaction areas.

[0058] Among them, the first cavity area 121 is connected to the second cavity area 122 through the reaction area to form a fluid flow channel, and the first cavity area 121 and / or the second cavity area 122 also include a hydrogen inlet and outlet, an air inlet and outlet, and a coolant inlet and outlet. The hydrogen inlet and outlet include a hydrogen inlet 123 and a hydrogen outlet 124, and the sum of the area of ​​the hydrogen inlet 123 and the area of ​​the hydrogen outlet 124 is S1. The air inlet and outlet include an air inlet 125 and an air outlet 126, and the sum of the area of ​​the air inlet 125 and the area of ​​the air outlet 126 is S2. The coolant inlet and outlet include a coolant inlet 127 and a coolant outlet 128, and the sum of the area of ​​the coolant inlet 127 and the area of ​​the coolant outlet 128 is S3, and S1, S2 and S3 satisfy: S2≥2×S1, S3≥2×S1.

[0059] It should be noted that, in the embodiment of the present application, the length direction of the plate body 1 is defined as the first direction x, and the width direction of the plate body 1 is defined as the second direction y.

[0060] In the embodiment of the present application, along the first direction x and / or the second direction y, a plurality of Figure 1 The shown monopolar plate basic structural units are interconnected to form a monopolar plate having a first cavity area 121, a second cavity area 122 and multiple reaction areas, so as to reduce the flow pressure drop of the monopolar plate and improve the working performance and area utilization of the monopolar plate.

[0061] Specifically, Figure 1As shown, the basic structural unit of the monopolar plate includes a flow field area 11 and a cavity area 12. Along the first direction x, the cavity area 12 is distributed on both sides of the flow field area 11, and the flow field area 11 and the cavity area 12 are connected to each other. Among them, the flow field area 11 is provided with a reaction area, and the cavity area 12 is provided with a hydrogen inlet and outlet, an air inlet and outlet, and a coolant inlet and outlet. Hydrogen, air, and coolant can flow into the reaction area through each inlet to react, and flow out of the monopolar plate through each outlet after flowing out of the reaction area.

[0062] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the monopolar plate provided in this embodiment is formed by connecting a plurality of monopolar plate basic structure units to each other along the first direction x and / or the second direction y. Taking the connection of two monopolar plate basic structure units along the first direction x as an example, in the process of connecting the two monopolar plate basic structure units along the first direction x, the cavity area 12 on the side where the two adjacent monopolar plate basic structure units are far away from each other remains unchanged, and serves as the first cavity area 121 facing the edge of the plate body 1 for each reaction zone, and the cavity area 12 on the side where the two adjacent monopolar plate basic structure units are close to each other overlaps to form a second cavity area 122 located between the two adjacent reaction zones. The monopolar plate thus formed has a first cavity area 121, a second cavity area 122 and two reaction zones.

[0063] Therefore, the monopolar plate provided in this embodiment sets a second cavity area 122 between the two reaction areas, so that the fluid can flow into the plate body 1 through the first cavity area 121 and then flow out of the plate body 1 through the second cavity area 122, or the fluid can flow into the plate body 1 through the second cavity area 122 and then flow out of the plate body 1 through the first cavity area 121.

[0064] This design can appropriately shorten the flow of the fluid in the plate 1, making the distribution of the fluid in the two reaction zones more uniform. Figure 6 and Figure 7 As shown in the figure, under the condition of the same current density, it is beneficial to reduce the flow resistance and pressure loss of the fluid during the flow process, thereby reducing the pressure drop, improving the reaction efficiency of the fluid in the reaction zone, and thus improving the working performance of the monopolar plate. Figure 8 As shown, by providing a shared second cavity area 122 between the two reaction areas, the area ratio of the reaction areas on the plate body 1 can be increased, which is beneficial to improving the area utilization rate of the plate body 1 .

[0065] Among them, the electrode plate A is a large-scale monopolar plate with one reaction zone in the prior art, the electrode plate B is the monopolar plate provided by the present application, and the electrode plate C is a large-scale monopolar plate with two reaction zones in the prior art.

[0066] It should be noted that when comparing electrode plate A with electrode plate B, the areas of the reaction zones of the two are equal, and when comparing electrode plate B with electrode plate C, the areas of the reaction zones of the two are equal.

[0067] It can be understood that the electrode plate A is a basic structural unit of a monopolar plate that is enlarged in proportion. At the same time, in the electrode plate C, there is a non-overlapping cavity between the two reaction zones, so that the cavity between the two, which is close to the first reaction zone 111, is connected to the cavity located on the other side of the first reaction zone 111 through the first reaction zone 111, and the cavity close to the second reaction zone 112 is connected to the cavity located on the other side of the second reaction zone 112 through the second reaction zone 112.

[0068] More specifically, the area S1 of the hydrogen inlet and outlet, the area S2 of the air inlet and outlet, and the area S3 of the coolant inlet and outlet satisfy: S2 ≥ 2×S1, S3 ≥ 2×S1.

[0069] Since the purity of hydrogen is relatively high, the flow rate of hydrogen can be better controlled by setting a hydrogen inlet and outlet with a smaller flow area, so that the flow rate of hydrogen flowing into the plate body 1 is relatively small within the same flow time; at the same time, since the purity of oxygen in the air is relatively low, the air input efficiency can be improved by setting an air inlet and outlet with a larger flow area, so that the flow rate of air flowing into the plate body 1 is relatively large within the same flow time.

[0070] Therefore, when the area S1 of the hydrogen inlet and outlet and the area S2 of the air inlet and outlet satisfy S2≥2×S1, the ratio of hydrogen to oxygen in the reaction zone can be within an appropriate range, which is beneficial to increase the amount of water generated and improve the reaction efficiency.

[0071] At the same time, when the area S1 of the hydrogen inlet and outlet and the area S3 of the coolant inlet and outlet satisfy S3 ≥ 2×S1, the flow rate of the coolant flowing into the plate body 1 can be increased, which is beneficial to improving the heat dissipation efficiency, so as to reduce the possibility of damage to the plate body 1 during the reaction process, thereby ensuring the stability and reliability of the monopolar plate during the working process. In addition, during the reaction process, a large amount of coolant can be evenly distributed in the reaction zone, which is beneficial to better adjust the humidity conditions of the monopolar plate, thereby improving the reaction efficiency.

[0072] In a possible implementation, the area S2 of the air inlet and outlet and the area S3 of the coolant inlet and outlet satisfy S2=S3, which is beneficial to improve the heat dissipation efficiency of the monopolar plate while ensuring the thermal balance of the monopolar plate, thereby further improving the stability and reliability of the monopolar plate during operation. In addition, the cavities with equal areas are easy to process during the production process, so as to reduce the manufacturing difficulty and improve the production efficiency.

[0073] In summary, the monopolar plate provided in this embodiment can shorten the flow of the fluid in the plate body 1 and improve the uniformity of the distribution of the fluid in the reaction zone by setting the first cavity area 121, the second cavity area 122 and the multiple reaction zones distributed at intervals, thereby achieving the purpose of reducing the flow pressure drop of the monopolar plate and improving the working performance and area utilization of the monopolar plate. In addition, by setting the area ratio between the hydrogen inlet and outlet, the air inlet and outlet and the cooling inlet and outlet, the reaction efficiency of the fluid in the reaction zone and the heat dissipation efficiency of the monopolar plate can be improved, so that the monopolar plate can have a stable thermal balance during operation, thereby improving the working performance of the monopolar plate while reducing the possibility of overheating and damage to the monopolar plate, which is conducive to extending the service life of the monopolar plate.

[0074] In a specific embodiment, in the first cavity area 121, the area S1 of the hydrogen inlet and outlet meets 0.5 cm 2 ≤S1≤10cm 2 , the area S2 of the air inlet and outlet meets 1cm 2 ≤S2≤40cm 2 The area S3 of the coolant inlet and outlet meets 1cm 2 ≤S3≤40cm 2 .

[0075] The area S1 of the hydrogen inlet and outlet can be specifically 0.5 cm 2 , 1cm 2 、1.5cm 2 , 2cm 2 、2.5cm 2 , 3cm 2 、3.5cm 2 、4cm 2 、4.5cm 2 , 5cm 2 、5.5cm 2 、6cm 2 、6.5cm 2 、7cm 2 、7.5cm 2 、8cm 2 、8.5cm 2 、9cm 2 、9.5cm 2 , 10cm 2 wait.

[0076] The area S2 of the air inlet and outlet can be 1 cm 2 , 3cm 2 , 5cm 2 、7cm 2 、9cm 2 、11cm 2 、13cm2 、15cm 2 、17cm 2 、19cm 2 、21cm 2 、23cm 2 、25cm 2 、27cm 2 、29cm 2 、31cm 2 、33cm 2 、35cm 2 、37cm 2 、39cm 2 、40cm 2 wait.

[0077] The area S3 of the coolant inlet and outlet can be 1 cm 2 , 2cm 2 、4cm 2 、6cm 2 、8cm 2 , 10cm 2 、12cm 2 、14cm 2 、16cm 2 、18cm 2 , 20cm 2 、22cm 2 、24cm 2 、26cm 2 、28cm 2 、30cm 2 、32cm 2 、34cm 2 、36cm 2 、38cm 2 、40cm 2 wait.

[0078] When the areas of the hydrogen inlet and outlet, the air inlet and outlet, and the coolant inlet and outlet respectively meet the above conditions, the area of ​​the first cavity area 121 is moderate, and the proportion of the first cavity area 121 on the plate body 1 is within an appropriate range, so that the fluid can smoothly flow into or out of the plate body 1 through the first cavity area 121, which is beneficial to improving the stability of the fluid during the flow process.

[0079] In a specific embodiment, in the second cavity area 122, the area S1 of the hydrogen inlet and outlet meets 1 cm 2 ≤S1≤20cm 2 , the area S2 of air inlet and outlet meets 4cm 2 ≤S2≤160cm 2 The area S3 of the coolant inlet and outlet meets 2cm2 ≤S3≤80cm 2 .

[0080] The area S1 of the hydrogen inlet and outlet can be 1 cm 2 , 2cm 2 , 3cm 2 、4cm 2 , 5cm 2 、6cm 2 、7cm 2 、8cm 2 、9cm 2 , 10cm 2 、11cm 2 、12cm 2 、13cm 2 、14cm 2 、15cm 2 、16cm 2 、17cm 2 、18cm 2 、19cm 2 , 20cm 2 wait.

[0081] The area S2 of the air inlet and outlet can be 4 cm 2 , 10cm 2 , 20cm 2 、30cm 2 、40cm 2 , 50cm 2 、60cm 2 、70cm 2 、80cm 2 、90cm 2 , 100cm 2 、110cm 2 、120cm 2 、130cm 2 、140cm 2 、150cm 2 、160cm 2 wait.

[0082] The area S3 of the coolant inlet and outlet can be 2 cm 2 , 5cm 2 , 10cm 2 、15cm 2 , 20cm 2 、25cm 2 、30cm 2 、35cm 2 、40cm 2 、45cm 2, 50cm 2 、55cm 2 、60cm 2 、65cm 2 、70cm 2 、75cm 2 、80cm 2 wait.

[0083] When the areas of the hydrogen inlet and outlet, the air inlet and outlet, and the coolant inlet and outlet respectively meet the above conditions, the area of ​​the second cavity area 122 is moderate, and the proportion of the second cavity area 122 on the plate body 1 is within an appropriate range, which not only enables the fluid to flow smoothly into or out of the plate body 1 through the second cavity area 122, but also ensures the structural strength of the second cavity area 122, reduces the possibility of fracture of the monopolar plate during the lamination process, and thus improves the yield rate of the monopolar plate during the production process.

[0084] In a specific embodiment, the number of reaction zones is N, and N satisfies 2≤N≤8, and the area of ​​each reaction zone is S4, and S4 satisfies 50cm 2 ≤S4≤500cm 2 .

[0085] In the embodiment of the present application, the number N of reaction zones can be specifically 2, 3, 4, 5, 6, 7, 8, so that the overall area of ​​the monopolar plate is within a suitable range, thereby improving the working performance of the monopolar plate while reducing the production cost and assembly difficulty. Wherein, when the number of reaction zones is an odd number, the number of monopolar plate basic structure units is an odd number, and the monopolar plate can be formed by connecting multiple monopolar plate basic structure units in sequence along the first direction x; when the number of reaction zones is an even number, the number of monopolar plate basic structure units is an even number, and the monopolar plate can be formed by connecting multiple monopolar plate basic structure units in sequence along the first direction x and / or the second direction y.

[0086] The area S4 of each reaction zone can be 50 cm 2 , 100cm 2 、150cm 2 , 200cm 2 、250cm 2 、300cm 2 、350cm 2 、4000cm 2 、450cm 2 , 500cm 2etc., so that the area of ​​each reaction zone is within an appropriate range. Specifically, during the operation of the monopolar plate, the gas can be evenly distributed in each reaction zone and can fully react, and the coolant can promptly take the heat generated by the reaction out of the monopolar plate, which is beneficial to improve the reaction efficiency while improving the heat dissipation efficiency of the monopolar plate, so as to extend the service life of the monopolar plate.

[0087] In a possible implementation, the reaction zones have the same size along the first direction x and the same size along the second direction y, which is beneficial to further improve the uniformity of the fluid distribution in the plate body 1 .

[0088] In a specific embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the hydrogen inlet and outlet include a hydrogen inlet 123 and a hydrogen outlet 124 , the air inlet and outlet include an air inlet 125 and an air outlet 126 , and the coolant inlet and outlet include a coolant inlet 127 and a coolant outlet 128 .

[0089] In a specific embodiment, Figure 2 and Figure 3 As shown, the flow field area 11 includes a first reaction area 111 and a second reaction area 112 .

[0090] like Figure 2 As shown, when the first reaction zone 111 and the second reaction zone 112 are distributed at intervals along the first direction x, the first cavity area 121 is distributed along the first direction x on the side where the two reaction zones are away from each other (i.e., the side where the first reaction zone 111 faces the edge of the plate body 1 and the side where the second reaction zone 112 faces the edge of the plate body 1), and the second cavity area 122 is located along the first direction x on the side where the two reaction zones are close to each other (i.e., between the first reaction zone 111 and the second reaction zone 112).

[0091] Among them, one of the hydrogen inlet 123 and the air inlet 125 is located in the first cavity area 121, and the other is located in the second cavity area 122, and along the first direction x and the second direction y, the hydrogen inlet 123 and the hydrogen outlet 124, the air inlet 125 and the air outlet 126 are diagonally distributed relative to the first reaction zone 111 and the second reaction zone 112.

[0092] Specifically, when the hydrogen inlet 123 is located in the first cavity area 121 and the air inlet 125 is located in the second cavity area 122 , the hydrogen outlet 124 is located in the second cavity area 122 , and the air outlet 126 is located in the first cavity area 121 .

[0093] The hydrogen inlet and outlet include at least two hydrogen inlets 123 and one hydrogen outlet 124 , and the hydrogen outlet 124 is diagonally distributed with one hydrogen inlet 123 relative to the first reaction zone 111 , and is also diagonally distributed with another hydrogen inlet 123 relative to the second reaction zone 112 .

[0094] Such a design method is beneficial for increasing the hydrogen flow rate while extending the hydrogen flow process, so that the hydrogen can be fully diffused in each reaction zone, so as to improve the uniformity of hydrogen distribution in the first reaction zone 111 and the second reaction zone 112, thereby increasing the proportion of hydrogen participating in the reaction, improving the reaction efficiency in each reaction zone, and thus improving the working performance of the monopolar plate.

[0095] The air inlet and outlet include at least two air outlets 126 and one air inlet 125 , and the air inlet 125 is diagonally distributed with one air outlet 126 relative to the first reaction zone 111 , and is also diagonally distributed with another air outlet 126 relative to the second reaction zone 112 .

[0096] Such a design method is beneficial for increasing the air flow rate while extending the air flow process, so that the air can be fully diffused in each reaction zone, so as to improve the uniformity of air distribution in the first reaction zone 111 and the second reaction zone 112, thereby increasing the proportion of oxygen participating in the reaction, improving the reaction efficiency in each reaction zone, and thus improving the working performance of the monopolar plate.

[0097] At the same time, one of the cooling liquid inlet 127 and the cooling liquid outlet 128 is located in the first cavity area 121, and the other is located in the second cavity area 122. The cooling liquid inlet 127 and the cooling liquid outlet 128 are distributed on both sides of the first reaction zone 111 and the second reaction zone 112 along the first direction x.

[0098] Specifically, when the coolant inlet 127 is located in the second cavity area 122, the coolant outlet 128 is located in the first cavity area 121, so that the coolant inlet and outlet include at least two coolant outlets 128 and one coolant inlet 127, and along the second direction y, the coolant inlet 127 is located between the hydrogen outlet 124 and the air inlet 125, and each coolant outlet 128 is located between the hydrogen inlet 123 and the air outlet 126.

[0099] This design method is conducive to improving the uniformity of the distribution of the coolant in each reaction zone. When hydrogen and air improve the reaction efficiency through cross convection, the coolant can produce a uniform cooling effect, reducing the possibility of local overheating of the monopolar plate, thereby effectively controlling the temperature of the monopolar plate during operation, so that the monopolar plate has a more stable thermal balance during operation, and further reducing the possibility of damage to the monopolar plate due to overheating during operation, so as to improve the reaction efficiency while extending the service life of the monopolar plate.

[0100] More specifically, in Figure 2 In the illustrated embodiment, the areas of the two hydrogen inlets 123 are equal, and the area of ​​the hydrogen inlet 123 is greater than the area of ​​the hydrogen outlet 124; the areas of the two air outlets 126 are equal, and the area of ​​the air inlet 125 is equal to the area of ​​the air outlet 126; the areas of the two coolant outlets 128 are equal, and the area of ​​the coolant inlet 127 is equal to the area of ​​the coolant outlet 128.

[0101] like Figure 3 As shown, when the first reaction zone 111 and the second reaction zone 112 are distributed at intervals along the second direction y, the first cavity area 121 is distributed along the first direction x and the second direction y on the side of the two reaction zones facing the edge of the plate body 1 (that is, the first cavity area 121 surrounds the flow field area 11), and the second cavity area 122 is located along the second direction y on the side where the two reaction zones are close to each other (that is, between the first reaction zone 111 and the second reaction zone 112).

[0102] Among them, the hydrogen inlet 123 and the air inlet 125 are both located in the first cavity area 121, and are distributed on both sides of the flow field area 11 along the first direction x, and along the first direction x and the second direction y, the hydrogen inlet 123 and the hydrogen outlet 124, and the air inlet 125 and the air outlet 126 are diagonally distributed relative to the first reaction zone 111 and the second reaction zone 112.

[0103] Specifically, the hydrogen inlet 123 and the air inlet 125 are distributed on both sides of the flow field area 11 along the first direction x, and are centrally arranged with the flow field area 11 along the first direction x, so that the hydrogen and air can be evenly diverted after flowing into the plate body 1, thereby ensuring that the flow rate flowing to the first reaction area 111 and the flow rate flowing to the second reaction area 112 are slightly different or even equal, thereby further improving the uniformity of the fluid distribution in the plate body 1, and improving the efficiency of the reaction through cross convection of hydrogen and air.

[0104] More specifically, the hydrogen inlet and outlet include at least one hydrogen inlet 123 and two hydrogen outlets 124, and the hydrogen inlet 123 and one hydrogen outlet 124 are diagonally distributed relative to the first reaction zone 111, and are also diagonally distributed with the other hydrogen outlet 124 relative to the second reaction zone 112; the air inlet and outlet include at least one air inlet 125 and two air outlets 126, and the air inlet 125 and one air outlet 126 are diagonally distributed relative to the first reaction zone 111, and are also diagonally distributed with the other air outlet 126 relative to the second reaction zone 112.

[0105] Such a design method is beneficial for extending the gas flow while allowing the gas to be fully diffused in each reaction zone, so as to improve the uniformity of gas distribution in the first reaction zone 111 and the second reaction zone 112, thereby increasing the proportion of gas participating in the reaction, improving the reaction efficiency in each reaction zone, and further improving the working performance of the monopolar plate.

[0106] At the same time, one of the cooling liquid inlet 127 and the cooling liquid outlet 128 is located in the first cavity area 121, and the other is located in the second cavity area 122. The cooling liquid inlet 127 and the cooling liquid outlet 128 are distributed on both sides of the first reaction zone 111 and the second reaction zone 112 along the second direction y.

[0107] Specifically, when the coolant inlet 127 is located in the second cavity area 122, the coolant outlet 128 is located in the first cavity area 121, so that the coolant inlet and outlet include at least two coolant outlets 128 and one coolant inlet 127. Along the second direction y, the coolant inlet 127 is located between the first reaction zone 111 and the second reaction zone 112, and the two coolant outlets 128 are respectively located on the side of the first reaction zone 111 facing the edge of the plate body 1 and the side of the second reaction zone 112 facing the edge of the plate body 1.

[0108] Through such a design, the flow direction of the coolant and the flow direction of the gas are perpendicular to each other in each reaction zone, which is beneficial to improve the cooling effect of the coolant on each reaction zone to reduce the possibility of damage to the monopolar plate due to overheating during operation, thereby ensuring the stability and reliability of the monopolar plate during operation.

[0109] More specifically, in Figure 3 In the illustrated embodiment, the areas of the two hydrogen outlets 124 are equal, and the area of ​​the hydrogen inlet 123 is equal to the area of ​​the hydrogen outlet 124; the areas of the two air outlets 126 are equal, and the area of ​​the air inlet 125 is equal to the area of ​​the air outlet 126; the areas of the two coolant outlets 128 are equal, and the area of ​​the coolant inlet 127 is equal to the area of ​​the coolant outlet 128.

[0110] In a specific embodiment, Figure 4 and Figure 5 As shown, the flow field area 11 includes a first reaction zone 111 , a second reaction zone 112 , a third reaction zone 113 and a fourth reaction zone 114 .

[0111] Among them, along the first direction x, the first reaction zone 111 and the second reaction zone 112, the third reaction zone 113 and the fourth reaction zone 114 are distributed at intervals, and along the second direction y, the first reaction zone 111 and the third reaction zone 113, the second reaction zone 112 and the fourth reaction zone 114 are distributed at intervals.

[0112] like Figure 4 As shown, along the first direction x and the second direction y, the first cavity area 121 is located on the side of each reaction area facing the edge of the plate body 1 (that is, the first cavity area 121 surrounds the flow field area 11), and the second cavity area 122 is located between two adjacent reaction areas to separate the flow field area 11 into a first reaction area 111, a second reaction area 112, a third reaction area 113 and a fourth reaction area 114 that are not connected to each other (that is, the first reaction area 111 and the second reaction area 112, the first reaction area 111 and the third reaction area 113, the second reaction area 112 and the fourth reaction area 114, and the third reaction area 113 and the fourth reaction area 114 all have the second cavity area 122).

[0113] Among them, one of the hydrogen inlet 123 and the air inlet 125 is located in the first cavity area 121, and the other is located in the second cavity area 122, and along the first direction x and the second direction y, the hydrogen inlet 123 and the hydrogen outlet 124, the air inlet 125 and the air outlet 126 are diagonally distributed relative to each reaction zone.

[0114] Specifically, when the hydrogen inlet 123 is located in the first cavity area 121 and the air inlet 125 is located in the second cavity area 122 , the hydrogen outlet 124 is located in the second cavity area 122 , and the air outlet 126 is located in the first cavity area 121 .

[0115] The hydrogen inlet and outlet include at least two hydrogen inlets 123 and two hydrogen outlets 124, and the two hydrogen inlets 123 are distributed on both sides of the flow field area 11 along the first direction x, and are centered with the flow field area 11 along the first direction x, and the two hydrogen outlets 124 are distributed at intervals along the second direction y at both ends of the second cavity area 122 close to the edge of the plate body 1 (i.e., between the first reaction zone 111 and the second reaction zone 112, and between the third reaction zone 113 and the fourth reaction zone 114), so that each hydrogen inlet 123 and each hydrogen outlet 124 are diagonally distributed relative to the first reaction zone 111, the second reaction zone 112, the third reaction zone 113 and the fourth reaction zone 114, respectively.

[0116] The air inlet and outlet include at least one air inlet 125 and four air outlets 126, and the air inlet 125 is located between the two hydrogen outlets 124 along the second direction y, and the four air outlets 126 are located on both sides of the two hydrogen inlets 123 along the second direction y, so that the air inlet 125 and each air outlet 126 are diagonally distributed relative to the first reaction zone 111, the second reaction zone 112, the third reaction zone 113 and the fourth reaction zone 114.

[0117] This design method is beneficial in shortening the gas flow while allowing the gas to fully react in each reaction zone, thereby increasing the proportion of gas participating in the reaction, improving the reaction efficiency in each reaction zone, and further improving the working performance of the monopolar plate.

[0118] Meanwhile, one of the cooling liquid inlet 127 and the cooling liquid outlet 128 is located in the first cavity area 121 , and the other is located in the second cavity area 122 . The cooling liquid inlet 127 and the cooling liquid outlet 128 are distributed on both sides of each reaction zone along the second direction y.

[0119] Specifically, when the cooling liquid inlet 127 is located in the first cavity area 121, the cooling liquid outlet 128 is located in the second cavity area 122, so that the cooling liquid inlet and outlet include at least four cooling liquid inlets 127 and two cooling liquid outlets 128, and the four cooling liquid inlets 127 are respectively located on one side of each reaction zone toward the edge of the plate body 1 along the second direction y, and the two cooling liquid outlets 128 are respectively located between the first reaction zone 111 and the third reaction zone 113, and between the second reaction zone 112 and the fourth reaction zone 114 along the second direction y.

[0120] Through such a design, the flow direction of the coolant and the flow direction of the gas are perpendicular to each other in each reaction zone, which is beneficial to improve the cooling effect of the coolant on each reaction zone to reduce the possibility of damage to the monopolar plate due to overheating during operation, thereby ensuring the stability and reliability of the monopolar plate during operation.

[0121] More specifically, in Figure 4 In the illustrated embodiment, the areas of the two hydrogen inlets 123 are equal, the areas of the two hydrogen outlets 124 are equal, and the area of ​​the hydrogen inlet 123 is equal to the area of ​​the hydrogen outlet 124; the areas of the four air outlets 126 are equal, and the area of ​​the air inlet 125 is equal to the area of ​​the air outlet 126; the areas of the four coolant inlets 127 are equal, the areas of the two coolant outlets 128 are equal, and the area of ​​the coolant inlet 127 is equal to the area of ​​the coolant outlet 128.

[0122] like Figure 5As shown, along the first direction x, the first cavity area 121 is located on the side of each reaction area facing the edge of the plate body 1, and the second cavity area 122 is located between two adjacent reaction areas.

[0123] Among them, one of the hydrogen inlet 123 and the air inlet 125 is located in the first cavity area 121, and the other is located in the second cavity area 122, and along the first direction x and the second direction y, the hydrogen inlet 123 and the hydrogen outlet 124, the air inlet 125 and the air outlet 126 are diagonally distributed relative to each reaction zone.

[0124] Specifically, when the hydrogen inlet 123 is located in the first cavity area 121 and the air inlet 125 is located in the second cavity area 122 , the hydrogen outlet 124 is located in the second cavity area 122 , and the air outlet 126 is located in the first cavity area 121 .

[0125] The hydrogen inlet and outlet include at least two hydrogen inlets 123 and two hydrogen outlets 124, and the two hydrogen inlets 123 are distributed on both sides of the flow field area 11 along the first direction x, and are centered with the flow field area 11 along the first direction x, and the two hydrogen outlets 124 are distributed at intervals along the second direction y at both ends of the second cavity area 122 close to the edge of the plate body 1 (i.e., between the first reaction zone 111 and the second reaction zone 112, and between the third reaction zone 113 and the fourth reaction zone 114), so that each hydrogen inlet 123 and each hydrogen outlet 124 are diagonally distributed relative to the first reaction zone 111, the second reaction zone 112, the third reaction zone 113 and the fourth reaction zone 114, respectively.

[0126] The air inlet and outlet include at least one air inlet 125 and four air outlets 126, and the air inlet 125 is located between the two hydrogen outlets 124 along the second direction y, and the four air outlets 126 are located on both sides of the two hydrogen inlets 123 along the second direction y, so that the air inlet 125 and each air outlet 126 are diagonally distributed relative to the first reaction zone 111, the second reaction zone 112, the third reaction zone 113 and the fourth reaction zone 114.

[0127] Meanwhile, one of the cooling liquid inlet 127 and the cooling liquid outlet 128 is located in the first cavity area 121 , and the other is located in the second cavity area 122 . The cooling liquid inlet 127 and the cooling liquid outlet 128 are distributed on both sides of each reaction zone along the first direction x.

[0128] Specifically, when the coolant inlet 127 is located in the second cavity area 122, the coolant outlet 128 is located in the first cavity area 121, so that the coolant inlet and outlet include at least two coolant inlets 127 and four coolant outlets 128, and the two coolant inlets 127 are respectively located on both sides of the air inlet 125 along the second direction y, and the four coolant outlets 128 are respectively located on both sides of the two hydrogen inlets 123 along the second direction y.

[0129] This design method is conducive to shortening the gas flow, so that the gas can fully react in each reaction zone, so that the proportion of gas participating in the reaction is increased, thereby improving the reaction efficiency in each reaction zone. At the same time, it is conducive to improving the uniformity of the distribution of the coolant in each reaction zone. When hydrogen and air improve the reaction efficiency through cross convection, the coolant can produce a uniform cooling effect, reduce the possibility of local overheating of the monopolar plate, and thus effectively control the temperature of the monopolar plate during operation, so that the monopolar plate has a more stable thermal balance during operation, and further reduce the possibility of damage to the monopolar plate due to overheating during operation, so as to improve the reaction efficiency while extending the service life of the monopolar plate.

[0130] More specifically, in Figure 5 In the illustrated embodiment, the areas of the two hydrogen inlets 123 are equal, the areas of the two hydrogen outlets 124 are equal, and the area of ​​the hydrogen inlet 123 is equal to the area of ​​the hydrogen outlet 124; the areas of the four air outlets 126 are equal, and the area of ​​the air inlet 125 is smaller than the area of ​​the air outlet 126; the areas of the two coolant inlets 127 are equal, the areas of the four coolant outlets 128 are equal, and the area of ​​the coolant inlet 127 is equal to the area of ​​the coolant outlet 128.

[0131] In addition, in this embodiment, the plate body 1 is further provided with a convex rib 13, and along the second direction y, the convex rib 13 is located between two adjacent reaction zones, and along the first direction x, at least one end of the convex rib 13 is flush with the end of each reaction zone, or at least one end of the convex rib 13 protrudes at least a partial distance relative to the end of each reaction zone.

[0132] Specifically, along the second direction y, the rib 13 is arranged between the first reaction zone 111 and the third reaction zone 113, and between the second reaction zone 112 and the fourth reaction zone 114, so as to separate the first reaction zone 111 and the third reaction zone 113, and the second reaction zone 112 and the fourth reaction zone 114, thereby further dividing the two larger reaction zones between the first cavity area 121 and the second cavity area 122 into four reaction zones, which is beneficial to improving the sealing and structural strength of each reaction zone, thereby reducing the possibility of risks such as sealing failure of the flow field area 11 or local collapse of the plate body 1, and further improving the stability and reliability of the monopolar plate during operation.

[0133] At the same time, along the first direction x, at least one end of the rib 13 is flush with or protrudes at least part of the distance relative to the end of each reaction zone, so that before the fluid flows into each reaction zone, it is first diverted by the rib 13, thereby further improving the uniformity of the fluid distribution in the plate body 1.

[0134] More specifically, the hydrogen inlet 123, the air inlet 125 and the convex rib 13 are aligned along the first direction x, so that the hydrogen at one end flows to the first reaction zone 111 and the third reaction zone 113 respectively after being split by the convex rib 13, and the hydrogen at the other end flows to the second reaction zone 112 and the fourth reaction zone 114 respectively after being split by the convex rib 13. At the same time, the air can flow to the first reaction zone 111, the second reaction zone 112, the third reaction zone 113 and the fourth reaction zone 114 respectively through the convex rib 13, so that each reaction zone has a reaction and the reaction degree is the same, thereby improving the uniformity of the distribution of the reaction occurrence area in the flow field area 11.

[0135] The embodiment of the present application also provides a bipolar plate, which includes an anode plate and a cathode plate stacked together, and the anode plate and the cathode plate are both made of the monopolar plate described in any one of the above items. The hydrogen inlet and outlet are connected to the flow field area 11 of the anode plate to form a hydrogen flow channel; the air inlet and outlet are connected to the flow field area 11 of the cathode plate to form an air flow channel; the coolant inlet and outlet are connected to the space between the anode plate and the cathode plate to form a coolant flow channel.

[0136] In the embodiment of the present application, when the cathode plate and the anode plate are stacked and connected to form a bipolar plate, the hydrogen flow channel and the oxygen flow channel are respectively located on both sides of the bipolar plate along the thickness direction, and a coolant flow channel can be formed between the cathode plate and the anode plate, so that the three flow channels are not interconnected, so as to reduce the possibility of cross-flow of the fluid and improve the safety of the bipolar plate during operation.

[0137] Among them, the cathode plate and the anode plate can be fixedly connected by welding or other means to reduce the possibility of leakage of the coolant during the flow process, thereby improving the stability and reliability of the bipolar plate during operation.

[0138] At the same time, when the cathode plate and the anode plate are made of the above-mentioned monopolar plate, by setting the first cavity area 121, the second cavity area 122 and multiple reaction zones, it is beneficial to shorten the flow of the fluid in each reaction zone, improve the stability of the fluid flow in the bipolar plate and the uniformity of distribution, thereby reducing the flow resistance and pressure loss of the fluid during the flow process, thereby improving the reaction efficiency of the gas in the reaction zone, improving the cooling effect of the coolant on the bipolar plate, and increasing the area ratio of the reaction zone on the plate body 1, thereby improving the area utilization rate of the plate body 1.

[0139] An embodiment of the present application further provides a fuel cell, which includes a stacked membrane electrode assembly and a bipolar plate, and the bipolar plate is the bipolar plate described above.

[0140] In the embodiment of the present application, during the stacking process of the membrane electrode assembly and the bipolar plate, one side of the membrane electrode assembly abuts against the anode side of one bipolar plate, and the other side of the membrane electrode abuts against the cathode side of the other bipolar plate.

[0141] Specifically, during the operation of the fuel cell, hydrogen can flow into the reaction zone on the anode side of the bipolar plate through the hydrogen inlet 123 to react, and the unreacted hydrogen can flow out of the bipolar plate through the hydrogen outlet 124; air can flow into the reaction zone on the cathode side of the bipolar plate through the air inlet 125 to react, and the unreacted air and water generated by the reaction can flow out of the bipolar plate through the air outlet 126.

[0142] Among them, by setting the first cavity area 121, the second cavity area 122 and a plurality of reaction zones distributed at intervals on the bipolar plate, the area ratio of the reaction zone on the plate body 1 can be increased, and the area utilization rate of the plate body 1 can be improved, which is beneficial to improving the reaction efficiency inside the fuel cell, thereby improving the overall output power and further improving the energy density generated by the fuel cell.

[0143] At the same time, there is a common second cavity area 122 between two adjacent reaction areas, which can improve the flow distribution of gas and coolant in the plate body 1, which is beneficial to improving the uniformity of fluid flow, thereby further improving the reaction efficiency inside the fuel cell.

[0144] In addition, there is a shared second cavity area 122 between two adjacent reaction zones, which can also improve the thermal conductivity of the plate body 1 and ensure that the temperature distribution between the multiple monopolar plates is relatively uniform, which is beneficial to reduce the possibility of local overheating of the plate body 1, thereby improving the working performance of the plate body 1 while extending the service life of the plate body 1 and ensuring the stability and reliability of the fuel cell during operation.

[0145] The above describes in detail the structure, features and effects of the present application based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present application, but the present application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of the present application, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present application.

Claims

1. A monopolar plate, characterized in that: The monopolar plate comprises: A plate body, wherein the plate body is provided with a flow field area and a cavity area; The flow field area includes a plurality of reaction areas, and the plurality of reaction areas are spaced and distributed along the first direction and / or the second direction; The cavity opening area includes a first cavity opening area and a second cavity opening area. Along the first direction and / or the second direction, the first cavity opening area is located on the side of each reaction area facing the edge of the plate body, and the second cavity opening area is located between two adjacent reaction areas. Wherein, the first cavity port area is connected with the second cavity port area through the reaction area to form a flow channel for the fluid; The first cavity area and / or the second cavity area also includes a hydrogen inlet and outlet, an air inlet and outlet, and a coolant inlet and outlet. The hydrogen inlet and outlet include a hydrogen inlet and a hydrogen outlet, and the sum of the area of ​​the hydrogen inlet and the area of ​​the hydrogen outlet is S1; the air inlet and outlet include an air inlet and an air outlet, and the sum of the area of ​​the air inlet and the area of ​​the air outlet is S2; the coolant inlet and outlet include a coolant inlet and a coolant outlet, and the sum of the area of ​​the coolant inlet and the area of ​​the coolant outlet is S3, and S1, S2 and S3 satisfy: S2≥2×S1, S3≥2×S1.

2. The monopolar plate according to claim 1, characterized in that: The reaction zone comprises a first reaction zone and a second reaction zone, when the first reaction zone and the second reaction zone are spaced apart along a first direction, one of the hydrogen inlet and the air inlet is located in the first cavity port area, and the other is located in the second cavity port area, and along the first direction and the second direction, the hydrogen inlet and the hydrogen outlet, the air inlet and the air outlet are diagonally distributed relative to the first reaction zone and the second reaction zone; One of the cooling liquid inlet and the cooling liquid outlet is located in the first cavity area, and the other is located in the second cavity area. The cooling liquid inlet and the cooling liquid outlet are distributed on both sides of the first reaction zone and the second reaction zone along a first direction.

3. The monopolar plate according to claim 1, characterized in that: The reaction zone includes a first reaction zone and a second reaction zone, and when the first reaction zone and the second reaction zone are spaced apart and distributed along the second direction, the hydrogen inlet and the air inlet are both located in the first cavity area and distributed on both sides of the flow field area along the first direction, and along the first direction and the second direction, the hydrogen inlet and the hydrogen outlet, the air inlet and the air outlet are distributed diagonally relative to the first reaction zone and the second reaction zone; One of the cooling liquid inlet and the cooling liquid outlet is located in the first cavity area, and the other is located in the second cavity area. The cooling liquid inlet and the cooling liquid outlet are distributed on both sides of the first reaction zone and the second reaction zone along the second direction.

4. The monopolar plate according to claim 1, characterized in that: The flow field area includes a first reaction area, a second reaction area, a third reaction area and a fourth reaction area, and along the first direction and the second direction, the first reaction area, the second reaction area, the third reaction area and the fourth reaction area are distributed at intervals; One of the hydrogen inlet and the air inlet is located in the first cavity port area, and the other is located in the second cavity port area. Along the first direction and the second direction, the hydrogen inlet and the hydrogen outlet, the air inlet and the air outlet are distributed diagonally relative to each of the reaction zones; One of the cooling liquid inlet and the cooling liquid outlet is located in the first cavity area, and the other is located in the second cavity area. The cooling liquid inlet and the cooling liquid outlet are distributed on both sides of each of the reaction zones along the second direction.

5. The monopolar plate according to claim 1, characterized in that: The flow field area includes a first reaction area, a second reaction area, a third reaction area and a fourth reaction area, and along the first direction and the second direction, the first reaction area, the second reaction area, the third reaction area and the fourth reaction area are distributed at intervals; One of the hydrogen inlet and the air inlet is located in the first cavity port area, and the other is located in the second cavity port area. Along the first direction and the second direction, the hydrogen inlet and the hydrogen outlet, the air inlet and the air outlet are distributed diagonally relative to each of the reaction zones; One of the cooling liquid inlet and the cooling liquid outlet is located in the first cavity area, and the other is located in the second cavity area, and the cooling liquid inlet and the cooling liquid outlet are distributed on both sides of each of the reaction zones along the first direction; The plate body is also provided with a convex rib, and along the second direction, the convex rib is located between two adjacent reaction zones, and along the first direction, at least one end of the convex rib is flush with the end of each of the reaction zones, or at least one end of the convex rib protrudes at least a partial distance relative to the end of each of the reaction zones.

6. The monopolar plate according to any one of claims 1 to 5, characterized in that: In the first cavity area, the area S1 of the hydrogen inlet and outlet meets 0.5cm 2 ≤S1≤10cm 2 The area S2 of the air inlet and outlet meets 1cm 2 ≤S2≤40cm 2 The area S3 of the coolant inlet and outlet meets 1cm 2 ≤S3≤40cm 2 .

7. The monopolar plate according to any one of claims 1 to 5, characterized in that: In the second cavity area, the area S1 of the hydrogen inlet and outlet meets 1cm 2 ≤S1≤20cm 2 The area S2 of the air inlet and outlet meets 4cm 2 ≤S2≤160cm 2 The area S3 of the coolant inlet and outlet meets 2cm 2 ≤S3≤80cm 2 .

8. The monopolar plate according to any one of claims 1 to 5, characterized in that: The number of the reaction zones is N, and N satisfies 2≤N≤8, and the area of ​​each reaction zone is S4, and S4 satisfies 50cm 2 ≤S4≤500cm 2 .

9. A bipolar plate, characterized in that: The bipolar plate comprises an anode plate and a cathode plate which are stacked, and the anode plate and the cathode plate are both made of the monopolar plate according to any one of claims 1 to 8; The hydrogen inlet and outlet are connected to the flow field area of ​​the anode plate to form a hydrogen circulation channel; the air inlet and outlet are connected to the flow field area of ​​the cathode plate to form an air circulation channel; the coolant inlet and outlet are connected to the space between the anode plate and the cathode plate to form a coolant circulation channel.

10. A fuel cell, characterized in that: The fuel cell comprises a stacked membrane electrode assembly and a bipolar plate, and the bipolar plate is the bipolar plate according to claim 9.

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