Compact fuel cell bipolar plate and application thereof in new energy automobile battery

Abstract

A compact fuel cell bipolar plate and an application thereof in a new energy automobile battery belong to the field of fuel cell bipolar plate structures, and are technically characterized in that an opening area of an anode plate is oppositely arranged in a first direction of the bipolar plate, and an opening area of a cathode plate is oppositely arranged in the first direction of the bipolar plate; the second side of the anode plate and the first side of the first membrane electrode form a hydrogen side, the first side of the anode plate and the second side of the cathode plate form a water side, and the first side of the cathode plate and the second side of the second membrane electrode form an air side; the device is used for simultaneously optimizing flow channel distribution and mechanical support of a hydrogen cavity, a cavity and a water cavity in a limited space.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of fuel cell bipolar plate structure, and particularly relates to fuel cell bipolar plate design for realizing three-channel distribution of hydrogen cavity, air cavity and water cavity. BACKGROUND

[0002] The fuel cell bipolar plate is one of the core components of a proton exchange membrane fuel cell (PEMFC), which is mainly made of conductive material and has the functions of supporting electrodes, conducting current, distributing reaction gas, discharging generated water and dissipating heat. The structural design of the bipolar plate directly affects the performance, service life and cost of the fuel cell. The existing bipolar plate gas port is arranged in the length direction, and the water port is arranged in the width direction. The gas port and the water port can be separated by a reinforcing rib. This results in the length direction and the width direction of the bipolar plate being elongated, and the water ports arranged on both sides of the width direction are separated by the reinforcing rib, but the separated multiple water port spaces reduce the strength of the bipolar plate. The fuel cell to which the bipolar plate is applied is mainly used in new energy vehicles, which has higher requirements for its compactness.

[0003] Arranging the water port and the gas port in the length direction to reduce the width direction size can meet the requirement of compact structure. However, the height of the distribution area and the flow field area of the existing bipolar plate is basically the same, which causes the gas port and the water port to be arranged in the length direction at the same time, resulting in the flow of water being blocked and difficult to pass through the flow field area. Therefore, in order to meet the requirement of compact structure, the water port and the gas port are arranged in the length direction, but how to arrange the distribution area and the flow field area to enable the improved structure to simultaneously ensure the smoothness of the gas and water channels on both sides of the bipolar plate is a problem to be solved. In addition, the traditional bipolar plate often causes performance degradation due to fluid cross mixing in the distribution area, and the insufficient support strength easily causes the deformation of the membrane electrode. SUMMARY

[0004] The prior art is difficult to simultaneously optimize the flow channel distribution and mechanical support of the hydrogen cavity, the air cavity and the water cavity in a limited space. According to the fuel cell bipolar plate in some embodiments of the present application, it comprises an anode plate and a cathode plate, wherein: The opening area of the anode plate is arranged in the first direction of the bipolar plate, and the opening area of the cathode plate is arranged in the first direction of the bipolar plate; The second side of the anode plate is formed as a hydrogen side with the first side of the first membrane electrode, the first side of the anode plate is formed as a water side with the second side of the cathode plate, and the first side of the cathode plate is formed as an air side with the second side of the second membrane electrode.

[0005] According to the bipolar plate of the fuel cell in some embodiments of the present application, the first side of the anode plate comprises a plate surface area of a first height, a distribution area of a second height, and a flow field area of a third height, wherein the third height is higher than the second height, and the second height is higher than the first height. The flow field area of the first side of the anode plate is provided with at least two water channel grooves with a certain interval in the width direction. The water channel groove is a groove recessed downward from the third height of the flow field area of the first side of the anode plate to the first height of the plate surface area of the first side of the anode plate. The water channel groove comprises a groove wall and a bottom surface. The bottom surface of the water channel groove is in the same plane as the first height of the plate surface area of the first side of the anode plate, so that the water channel groove has a first depth. The junction between the distribution area of the first side of the anode plate and the flow field area of the first side of the anode plate has a certain height difference. The connecting surface of the first side of the anode plate is provided with a water port. The water port of the first side of the anode plate communicates the water channel groove of the flow field area of the first side of the anode plate and the distribution area of the first side of the anode plate.

[0006] According to the bipolar plate of the fuel cell in some embodiments of the present application, the interval between each adjacent water channel groove of the first side of the anode plate is uniform.

[0007] According to the bipolar plate of the fuel cell in some embodiments of the present application, the second side of the anode plate comprises a plate surface area of a third height, a distribution area of a second height, and a flow field area of a first height. The third height is higher than the second height, and the second height is higher than the first height. The bottom surface of the water channel groove of the flow field area of the first side of the anode plate is in the same plane as the third height of the plate surface area of the second side of the anode plate. The two water channel grooves of the flow field area of the first side of the anode plate are formed into ridge lines on the two back surfaces of the second side of the anode plate, and the flow field area of the first height of the second side of the anode plate is formed into a gas channel groove with a first depth. The flow field area of the first height of the second side of the anode plate is the bottom surface of the gas channel groove. The junction between the distribution area and the flow field area of the second side of the anode plate has a certain height difference.

[0008] According to the bipolar plate of the fuel cell in some embodiments of the present application, the distribution area of the first side of the anode plate is provided with a reinforcing rib. The reinforcing rib is in the shape of a groove, and the top of the groove is a circular platform. The reinforcing rib comprises a first reinforcing rib and a second reinforcing rib, wherein: The first reinforcing rib protrudes towards the first side of the anode plate, and the circular platform is higher than the third height of the first side of the anode plate. The second reinforcing rib is protruded towards the second side of the anode plate, and the circular platform surface is at a third height surface of the second side of the anode plate.

[0009] According to the fuel cell bipolar plate in some embodiments of the present application, along the width direction of the distribution area of the first side of the anode plate, the first reinforcing rib and the second reinforcing rib are arranged alternately in columns.

[0010] According to the fuel cell bipolar plate in some embodiments of the present application, the second side of the cathode plate includes a plate surface area of a third height surface, a distribution area of a second height surface, a flow field area of the third height surface, and a first virtual height surface; wherein the third height surface is higher than the second height surface, and the second height surface is higher than the first virtual height surface. The flow field area of the second side of the cathode plate is provided with at least two water channel grooves with a certain interval in the width direction. The water channel groove of the second side of the cathode plate is a groove formed by concave molding from the third height surface where the flow field area of the second side of the cathode plate is located to the first virtual height surface of the second side of the cathode plate, the water channel groove includes a groove wall and a bottom surface, the bottom surface of the water channel groove is in the same plane as the first virtual height surface of the second side of the cathode plate, and the water channel groove has a first depth. The interface between the distribution area of the second side of the cathode plate and the flow field area of the second side of the cathode plate has a certain height difference, the interface of the second side of the cathode plate is provided with a water port, and the water port of the second side of the cathode plate communicates the water port distribution area and the water channel groove of the flow field area of the second side of the cathode plate.

[0011] According to the fuel cell bipolar plate in some embodiments of the present application, the interval between each adjacent water channel groove of the second side of the cathode plate is uniform.

[0012] According to the fuel cell bipolar plate in some embodiments of the present application, the first side of the cathode plate includes a plate surface area of a first height surface, a distribution area of a second height surface, a flow field area of the first height surface, and a third virtual height surface; wherein the third virtual height surface is higher than the second height surface, and the second height surface is higher than the first height surface. The bottom surface of the water channel groove provided in the flow field area of the second side of the cathode plate is in the same plane as the third virtual height surface of the first side of the cathode plate. The two water channel grooves of the flow field area of the second side of the cathode plate are formed as gas channel grooves with a first depth on the two ridges of the back surface of the first side of the cathode plate and the flow field area of the first height surface of the first side of the cathode plate, and the flow field area of the first height surface of the first side of the cathode plate is the bottom surface of the gas channel groove. The interface between the distribution area of the first side of the cathode plate and the flow field area of the first side of the cathode plate has a height difference.

[0013] According to the fuel cell bipolar plate in some embodiments of the application, the distribution area of the second side of the cathode plate is provided with a reinforcing rib, the reinforcing rib is provided in a groove shape, and the top of the groove is a circular platform. The reinforcing rib comprises a second reinforcing rib, the second reinforcing rib protrudes towards the first side of the cathode plate, and the circular platform surface is at the third virtual height surface of the first side of the cathode plate.

[0014] According to the fuel cell bipolar plate in some embodiments of the application, the second reinforcing rib is arranged in a column along the width direction of the distribution area of the second side of the cathode plate. The position of the second reinforcing rib of the distribution area of the second side of the cathode plate corresponds to the position of the first reinforcing rib of the distribution area of the first side of the anode plate, the first reinforcing rib of the distribution area of the first side of the anode plate protrudes towards the first side of the anode plate, the circular platform surface is higher than the third height surface of the first side of the anode plate, and abuts against the surface of the distribution area of the second side of the cathode plate.

[0015] According to the fuel cell bipolar plate in some embodiments of the application, the plate surface area of the third height surface of the second side of the anode plate, the bottom surface of the water channel at the third height surface of the second side of the anode plate, and the circular platform surface of the second reinforcing rib at the third height surface of the second side of the anode plate are connected to the first membrane electrode to form a hydrogen side. The first side of the anode plate and the second side of the cathode plate are connected through a frame area, the circular platform surface of the first reinforcing rib of the distribution area of the second height surface of the first side of the anode plate abuts against the distribution area of the second height surface of the second side of the cathode plate, and the flow field area of the third height surface of the first side of the anode plate is connected to the flow field area of the third height surface of the second side of the cathode plate to form a water side. The plate surface area of the third height surface of the first side of the cathode plate, the bottom surface of the water channel at the third virtual height surface of the first side of the cathode plate, and the circular platform surface of the second reinforcing rib at the third virtual height surface of the first side of the cathode plate are connected to the second membrane electrode to form an air side.

[0016] The fuel cell bipolar plate in some embodiments of the application is applied to a new energy automobile battery.

[0017] Advantages: In the first aspect, the application realizes compact structure and smooth fluid flow. The water port and the gas port are arranged in the length direction of the polar plate. Compared with the layout of the water port and the gas port arranged in different directions in the prior art, the width direction size of the bipolar plate is effectively reduced, meeting the high requirement of compact structure in new energy vehicle and other application scenarios. Meanwhile, the realization basis is the design of different height surfaces of the anode plate, the cathode plate distribution area and the flow field area. For example, the first side flow field area of the anode plate is the third height surface, the distribution area is the second height surface, and the plate surface area is the first height surface. The water channel is formed by concave molding from the third height surface to the first height surface of the flow field area, and the bottom surface is flush with the first height surface of the plate surface area. When the gas port and the water port are located in the length direction at the same time, the water is smoothly guided from the distribution area to the flow field area, the water flow is prevented from being blocked, and a channel is left for the gas flow, realizing the reasonable distribution and smooth flow of hydrogen, air and cooling liquid in the hydrogen cavity, the air cavity and the water cavity.

[0018] In the second aspect, the application guarantees uniform fluid distribution and reduces resistance. The combination of the anode plate and the cathode plate forms three cavities (hydrogen cavity, air cavity and water cavity), providing flow channels for the three fluids respectively. The specific height difference between the distribution area and the flow field area, together with the water channel and the gas channel, makes the fluid distribution more uniform in the respective cavities, effectively reduces the resistance of the fluid flow in the distribution area, reduces energy loss, and improves the working efficiency of the fuel cell.

[0019] In the third aspect, the application enhances mechanical support and stability. The reinforcing ribs arranged in the distribution areas of the anode plate and the cathode plate play an important role. The reinforcing ribs of the anode plate adopt concave-convex shape and opposite directions. The hydrogen cavity gas side reinforcing rib can support the anode side frame of the membrane electrode distribution area, preventing the deformation of the frame caused by the gas pressure difference between the anode and the cathode, and blocking the gas flow channel. The water cavity side reinforcing rib is height-adapted to the cathode plate water cavity side, and cooperates with the cathode plate to provide good support. The reinforcing ribs of the cathode plate are in the same direction and are equally distributed, which can support the cathode side frame of the membrane electrode distribution area. At the same time, the reinforcing ribs at the corresponding positions of the anode plate and the cathode plate cooperate with each other to ensure that the frame of the single cell membrane electrode distribution area obtains sufficient support between the fluid distribution areas of the anode plate and the cathode plate, preventing the frame from collapsing in any direction, greatly enhancing the overall mechanical strength and stability of the bipolar plate, avoiding the deformation of the membrane electrode, and prolonging the service life of the fuel cell.

[0020] In the fourth aspect, the application improves the sealing and safety. The accurate cooperation of the different height surface areas of the anode plate and the cathode plate, and the stabilizing effect of the reinforcing ribs on the polar plate structure during the supporting process, ensure the good sealing between the areas of the bipolar plate, effectively preventing the leakage of hydrogen, air and cooling liquid. This not only improves the safety of the fuel cell, avoids the safety hazards such as fire and explosion caused by gas leakage, but also ensures the stability of the concentration and pressure of the reaction gas in the cell, maintains the stable operation of the fuel cell, and reduces the performance degradation problem caused by leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the coordination relationship of bipolar plates.

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the water side of the anode plate.

[0023] Figure 3 yes Figure 2 A partial schematic diagram of .

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the hydrogen side of the anode plate.

[0025] Figure 5 yes Figure 4 A partial schematic diagram of .

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the water side of the cathode plate.

[0027] Figure 7 yes Figure 6 A partial schematic diagram of .

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the air side of the cathode plate.

[0029] Figure 9 yes Figure 8 A partial schematic diagram of . DETAILED DESCRIPTION

[0030] Figure 1 The figure is a schematic diagram of the coordination relationship of the bipolar plates, used to illustrate the distribution relationship between the bipolar plates and the membrane electrode. The bipolar plate of a fuel cell cell of the present invention includes an anode plate and a cathode plate.

[0031] like Figure 1 As shown, in the present invention, the first side of the anode plate and the second side of the cathode plate are formed into a water side, and the second side of the anode plate and the first side of the first membrane electrode are formed into a hydrogen side.

[0032] like Figure 2 and 4 As shown, the anode plate is divided into different zones along its length, including a first opening zone, a first distribution zone, a flow field zone, a second distribution zone, and a second opening zone. The first opening zone includes a hydrogen inlet, an air inlet, and a water inlet, and the anode plate blocks the air inlet. Air passes through the plate but does not enter the distribution zone and flow field zone. The second opening zone includes a hydrogen inlet, an air outlet, and a water outlet, and the anode plate blocks the air outlet. No opening zone is provided in the width direction.

[0033] like Figures 2-3As shown, water side is on the right, hydrogen side is on the left. The first side (right side, water side) of the anode plate includes the plate surface area 110 of the first height surface, the first distribution area 121 of the second height surface, the flow field area 130 of the third height surface and the second distribution area 122 of the second height surface. The first height surface has a convex height of the first height, the second height surface has a convex height of the second height, and the third height surface has a convex height of the third height. It can be understood that the height refers to the height on the side, that is, the convex height on the side (such as the convex height on the first side, the convex height on the second side), which is defined as the vertical distance to the surface of the area. In the present application, the plate surface area includes the plate surface area around the distribution area and the flow field area.

[0034] As shown in FIG. 1, the first side (right side, water side) of the anode plate includes the plate surface area 110 of the first height surface, the first distribution area 121 of the second height surface, the flow field area 130 of the third height surface and the second distribution area 122 of the second height surface. Figures 2-3 As shown in FIG. 1, the first side (right side, water side) of the anode plate includes the plate surface area 110 of the first height surface, the first distribution area 121 of the second height surface, the flow field area 130 of the third height surface and the second distribution area 122 of the second height surface.

[0035] As shown in FIG. 1, the first side (right side, water side) of the anode plate includes the plate surface area 110 of the first height surface, the first distribution area 121 of the second height surface, the flow field area 130 of the third height surface and the second distribution area 122 of the second height surface. Figures 2-3 As shown in FIG. 1, the first side (right side, water side) of the anode plate includes the plate surface area 110 of the first height surface, the first distribution area 121 of the second height surface, the flow field area 130 of the third height surface and the second distribution area 122 of the second height surface.

[0036] As shown in FIG. 1, the first side (right side, water side) of the anode plate includes the plate surface area 110 of the first height surface, the first distribution area 121 of the second height surface, the flow field area 130 of the third height surface and the second distribution area 122 of the second height surface. Figures 2-3 As shown in FIG. 1, the first side (right side, water side) of the anode plate includes the plate surface area 110 of the first height surface, the first distribution area 121 of the second height surface, the flow field area 130 of the third height surface and the second distribution area 122 of the second height surface.

[0037] As shown in FIG. 1, the first side (right side, water side) of the anode plate includes the plate surface area 110 of the first height surface, the first distribution area 121 of the second height surface, the flow field area 130 of the third height surface and the second distribution area 122 of the second height surface. Figures 2-3As shown, the depth of the water channel 131 is the depth between the first height surface and the third height surface, that is, the bottom surface 1311 of the water channel 131 is substantially flush with the plate surface area 110 of the first height surface, and the distribution area 120 at the second height surface between the flow field area 130 at the third height surface and the plate surface area 110 of the first height surface is higher than the bottom surface 1311 of the water channel 131 at the first height surface. On this side, the water inlet of the distribution area 120 at the lower height position is drained to the flow field area 130 at the higher height position, that is, into the concave water channel 131 in the flow field area 130.

[0038] As shown in Figures 2-3 , in the first side (right side, water side) of the anode plate, the distribution area 120 is provided with a reinforcing rib 150, which is provided in a groove shape with a circular platform at the top of the groove. The reinforcing rib 150 includes a first reinforcing rib 151 and a second reinforcing rib 152. The first reinforcing rib 151 protrudes towards the side where the plate is located (water side) on the side where the plate is located (water side), that is, it protrudes towards the water side from the distribution area 120. It can be understood that the second side protrudes in the direction of the first side. The circular platform surface exceeds the third height surface of the side where the plate is located, and the excess height is the height difference between the distribution area 320 and the flow field area 330. The second reinforcing rib protrudes towards the opposite side (hydrogen side) of the side where the plate is located, and the circular platform surface is at the third height surface of the plate surface area 110 of the opposite side (second side). Along the width direction of the distribution area 120, the first reinforcing rib 151 and the second reinforcing rib 152 are arranged in columns alternately, and there is a certain interval between the two columns. The reinforcing ribs 150 are arranged in columns alternately and uniformly, so that the distance between any two adjacent first reinforcing ribs 151 is the same, the distance between any two adjacent second reinforcing ribs 152 is the same, and the distance between any two adjacent first reinforcing ribs 151 and second reinforcing ribs 152 is the same.

[0039] Taking the water side on the right and the hydrogen side on the left as an example. The second side (left side, hydrogen side) of the anode plate is opposite to the first side (right side) in terms of area height, as shown in Figures 2-3 , the first side (right side, water side) of the anode plate includes the plate surface area 110 of the first height surface, the first distribution area 121 of the second height surface, the flow field area 130 of the third height surface, and the second distribution area 122 of the second height surface. As shown in Figure 3 , the second side (left side, hydrogen side) of the anode plate includes the plate surface area 210 of the third height surface, the first distribution area 221 of the second height surface, the flow field area 230 of the first height surface, and the second distribution area 222 of the second height surface.

[0040] It can be understood that, as shown in Figures 2-3 and Figures 4-5As shown, for the water side on the right, the first height surface, the second height surface and the third height surface are equivalent to make the anode plate protrude from the left side to the right side, the protrusion height of the third height surface is the largest. The protrusion height of the first height surface is the smallest, which can be understood as the reference surface. It can also be understood that, for the hydrogen side on the left, the first height surface, the second height surface and the third height surface are equivalent to make the anode plate protrude from the right side to the left side, the protrusion height of the third height surface is the largest, and the protrusion height of the first height surface is the smallest.

[0041] As shown in FIG. 1, the anode plate 100 has a first side (the right side, the water side) and a second side (the left side, the hydrogen side). The first side is provided with a flow field region 130, a distribution region 120 and a plate surface region 110. The second side is provided with a flow field region 230, a distribution region 220 and a plate surface region 210. Figures 4-5 As shown, in the second side (the left side, the hydrogen side) of the anode plate, the first height surface has a protrusion height of the first height, the second height surface has a protrusion height of the second height, and the third height surface has a protrusion height of the third height. It can be understood that the height refers to the height on this side, that is, the protrusion height on this side.

[0042] As shown in FIG. 1, the anode plate 100 has a first side (the right side, the water side) and a second side (the left side, the hydrogen side). The first side is provided with a flow field region 130, a distribution region 120 and a plate surface region 110. The second side is provided with a flow field region 230, a distribution region 220 and a plate surface region 210. Figures 4-5 As shown, in the second side (the left side, the hydrogen side) of the anode plate, the third height surface is higher than the second height surface, and the second height surface is higher than the first height surface, so that the distribution region has a first height difference with the flow field region, and the distribution region has a second height difference with the plate surface region.

[0043] As shown in FIG. 1, the anode plate 100 has a first side (the right side, the water side) and a second side (the left side, the hydrogen side). The first side is provided with a flow field region 130, a distribution region 120 and a plate surface region 110. The second side is provided with a flow field region 230, a distribution region 220 and a plate surface region 210. Figures 2-3 and Figures 4-5 As shown, the plate surface region 110 on the first side is located on the first height surface, and the plate surface region 210 on the second side is located on the third height surface. The flow field region 130 on the first side is located on the third height surface, and the flow field region 230 on the second side is located on the first height surface. That is, for the first side of the anode plate, the flow field region 130 has the longest height on the first side, which is equivalent to the most protruding. The distribution region 120 is the second. The plate surface region 110 has the shortest height on the first side, which is the flattest, and can be understood as the reference surface. For the second side of the anode plate, the flow field region 230 has the shortest height on the second side, which is the flattest, and can be understood as the reference surface. The distribution region 220 is the second. The plate surface region 210 has the longest protrusion height on the second side, which is equivalent to the longest protrusion.

[0044] As shown in FIG. 1, the anode plate 100 has a first side (the right side, the water side) and a second side (the left side, the hydrogen side). The first side is provided with a flow field region 130, a distribution region 120 and a plate surface region 110. The second side is provided with a flow field region 230, a distribution region 220 and a plate surface region 210. Figures 4-5As shown, the bottom surface 1312 of the water channel 131 of the flow field region 130 of the first side of the anode plate is arranged at the third height surface, and the bottom surface 1312 of the water channel 131 of the flow field region 130 of the first side of the anode plate is higher than the distribution region 220 of the second height surface and the flow field region 230 of the first height surface. The two water channels 130 of the flow field region 130 of the first side of the anode plate are formed between the ridges of the back surface of the flow field region 230 of the first height surface (as the bottom surface) of the second side of the anode plate, and the gas channel 132 with the first depth is formed between the flow field region 230 of the first height surface and the back surface of the two water channels 130 of the flow field region 230 of the second side of the anode plate. The flow field region 230 of the first height surface is the bottom surface 1321 of the gas channel, and the first depth is the depth between the third height surface and the first height surface. The flow field region 230 of the first height surface is spaced between the protrusions (upper closed surface protrusions) of the two water channels 130 to form a gas channel. It can be understood that the protrusions of the water channel 130 refer to the shape of the back surface of the water channel.

[0045] As shown, Figures 4-5 In the second side (left side, hydrogen side) of the anode plate, the distribution region 220 and the flow field region 230 are arranged at different height surfaces, and the junction surface 240 between the distribution region 220 and the flow field region 230 is a connecting surface with a certain height, which is a vertical surface or an inclined surface. One side of the junction surface 240 is connected with the distribution region 220 of the second height surface, and the other side is connected with the flow field region 230 of the third height surface.

[0046] As shown above, Figures 4-5 In the second side (left side, hydrogen side) of the anode plate, the flow field region 230 of the second side of the anode plate is formed between the ridges of the back surface of the two water channels 130 of the flow field region 230 of the first height surface and the flow field region 230 of the first height surface, and the gas channel 132 with the first depth is formed between the flow field region 230 of the first height surface and the back surface of the two water channels 130 of the flow field region 230 of the second side of the anode plate. The flow field region 230 of the first height surface is the bottom surface 1321 of the gas channel, and the distribution region 220 of the second height surface between the flow field region 230 of the first height surface and the plate surface region 210 of the third height surface is higher than the bottom surface 1321 of the gas channel of the flow field region 230 of the first height surface. Due to the height difference, the distribution region 220 with a high height position can guide the gas flow to the flow field region 230 with a lower height position, i.e. the gas channel 132.

[0047] The above-mentioned preferred consistent spacing distance between adjacent water channels 131 can further improve the uniformity of the water flow in the flow field region 130. According to the formation of the gas channel 132 from the water channel 131, the uniformity of the gas flow in the flow field region 230 can also be improved.

[0048] The above-mentioned purpose of the present application is to set the relative opening in the length direction without setting the opening (gas and water inlet and outlet) in the width direction of the polar plate. However, in the two sides of the polar plate, the distribution area of one side is higher than the flow field area, which leads to the distribution area of the other side to be necessarily lower than the flow field area. The relative opening is only set in the length direction, which cannot solve the synchronous and smooth flow of gas and water on the two sides. The distribution area 220 of the second side is higher than the flow field area 230, which can realize the flow of gas from the high-position distribution area 220 to the low-position flow field area 230. However, the distribution area 120 of the first side is lower than the flow field area 130, which makes the water inlet of the distribution area 120 difficult to flow smoothly into the flow field area 130. The present application reduces the height of the water channel relative to the distribution area 120 on the first side through the water groove 131, realizes the smooth flow of water from the low-position distribution area 120 to the high-position flow field area 130, and can realize the synchronous and smooth flow of gas and water on the two sides of the polar plate. In addition, the water groove 131 can also serve as the groove wall of the air groove 132 on the second side, which can also realize the diversion of air flow and the uniform flow of air in the flow field area 230. In addition, the water groove 131 can also serve as the support between the membrane electrode on the opposite side of the side.

[0049] As shown in Figure 1 , in the present application, the second side of the cathode plate and the first side of the anode plate are matched to form a water side, and the first side of the cathode plate and the second side of the second membrane electrode are matched to form an air side.

[0050] As shown in Figure 2 and 4 , the cathode plate is provided with different zones along the length direction, including a first opening area, a first distribution area, a flow field area, a second distribution area and a second opening area. The first opening area includes a hydrogen inlet, an air outlet and a water inlet, and the anode plate blocks the hydrogen inlet. Hydrogen passes through the polar plate but does not enter the distribution area and the flow field area. The second opening area includes a hydrogen outlet, an air outlet and a water outlet, and the anode plate blocks the hydrogen outlet. No opening area is set in the width direction.

[0051] Taking the water side on the left and the air side on the right as an example. As shown in Figures 6-7 , the second side (left side, water side) of the cathode plate includes a plate surface area 310 of a third height surface, a first distribution area 321 of a second height surface, a flow field area 330 of a third height surface and a second distribution area 322 of a second height surface. It also includes a first virtual height surface with a virtual protruding height of a first height, a second height surface with a protruding height of a second height, and a third height surface with a protruding height of a third height. It can be understood that the height refers to the height on the side, that is, the protruding height on the side.

[0052] As Figures 6-7 shown, in the second side (left side, water side) of the cathode plate, the third height surface is higher than the second height surface, and the second height surface is higher than the first virtual height surface, so that the distribution area 320 has a first height difference with the plate surface area 310 and the flow field area 330, and the distribution area 320 has a virtual second height difference with the first virtual height surface.

[0053] As Figures 6-7 shown, in the second side (left side, water side) of the cathode plate, at least two water channels 331 with a certain interval are arranged along the width direction of the flow field area 330, and the water channels 331 are arranged between the first distribution area and the second distribution area on the flow field area. In the height direction, the water channels 331 are recessed grooves formed in the direction from the third height surface where the flow field area 330 is located to the second height surface where the distribution area 320 is located. The water channels include a groove wall 3311 and a bottom surface 3312. The bottom surface 3312 of the water channel is lower than the second height surface where the distribution area 320 is located, and is in the same plane as the first virtual height surface, so that the water channel 331 has a first depth, which can be the depth between the third height surface and the first virtual height surface. The two water channels 331 (open-top grooves) are separated by the flow field area 330 of the third height surface. Preferably, the interval distance between adjacent water channels 331 is consistent, which can further improve the uniformity of water flow in the flow field area 330.

[0054] The first virtual height surface is a height surface lower than the second height surface where the plate surface area 310 is located. The first virtual height surface has a virtual convex height of a first height, the second height surface has a convex height of a second height, and the third height surface has a convex height of a third height. The second height surface is higher than the first virtual height surface, and the distribution area 320 has a virtual second height difference with the first virtual height surface. As Figures 6-7 shown, in the second side (left side, water side) of the cathode plate, the distribution area 320 and the flow field area 330 are arranged at different height surfaces, so that the junction surface 340 between the distribution area 320 and the flow field area 330 is a connecting surface with a certain height, which is a vertical surface or an inclined surface. One side of the junction surface 340 is connected with the distribution area 320 of the second height surface, and the other side is connected with the flow field area 330 of the third height surface. The junction surface 340 is provided with a water port 341 to communicate the distribution area 320 and the water channel 331 of the flow field area 330.

[0055] As described above, as Figures 6-7As shown, the depth of the water trough channel 331 is the depth between the first virtual height plane and the third height plane, that is, the bottom surface 3312 of the water trough channel 331 is basically flush with the first virtual height plane, and the distribution area 320 at the second height plane between the flow field area 330 and the plate area 310 at the third height plane is higher than the bottom surface 3312 of the water trough channel 331 at the first virtual height plane. On this side, a water outlet 341 is realized through the interface 340 between the distribution area 320 and the flow field area 330, which can divert water from the distribution area 320 at a lower height position to the water trough channel 331 in the flow field area 330 at a higher height position.

[0056] like Figures 6-7 As shown, on the second side (left side, water side) of the cathode plate, the distribution area 320 is provided with reinforcing ribs 350. The reinforcing ribs 350 are arranged in a groove shape, and the top of the groove is a circular platform. The reinforcing ribs 350 include second reinforcing ribs 352. The second reinforcing ribs 352 are located on the side of the electrode plate, and they protrude toward the opposite side (the air side). The circular platform surface is located on the third virtual height plane on the opposite side (which is the first virtual height plane on this side). Along the width direction of the distribution area 320, the second reinforcing ribs 352 are arranged in columns, with a certain distance between the two columns. The reinforcing ribs 350 are evenly arranged in columns so that the distance between any two adjacent second reinforcing ribs 352 is the same.

[0057] As described above, the first reinforcing rib 151 on the first side of the anode plate is located on the side of the anode plate (the water side), protruding toward that side. The circular platform surface of the first reinforcing rib 151 is longer than the third elevation plane of the flow field region 130 on the anode plate side, by a height equal to the height difference between the distribution area 320 and the flow field region 330 on the first side of the cathode plate. The second reinforcing rib 352 on the second side of the cathode plate of the present invention is located in the distribution area 320 of the cathode plate, corresponding to the location of the second reinforcing rib 152 on the first side of the anode plate in the distribution area 120 of the anode plate. This allows the first reinforcing rib 151 on the first side of the anode plate to abut against the non-reinforcing rib surface of the distribution area 320 of the cathode plate, thereby increasing the support strength of the distribution area and avoiding the second reinforcing rib 352. This is intended to reduce the support provided by the second reinforcing rib 352 to the distribution area 320 / 320 if it abuts against the second reinforcing rib 352 on the second side of the cathode plate, as the second reinforcing rib 352 is recessed and hollow.

[0058] Take the water side on the left and the air side on the right as an example. The second side (left side, water side) of the cathode plate and the first side (right side) are the two sides with opposite area height settings, such as Figures 6-7As shown, the second side (left side, water side) of the cathode plate includes the plate surface area 310 of the third height, the first distribution area 321 of the second height, the flow field area 330 of the third height, and the second distribution area 322 of the second height, and the first virtual height. Then as Figures 8-9 As shown, the first side (right side, air side) of the cathode plate includes the plate surface area 410 of the first height, the first distribution area 421 of the second height, the flow field area 430 of the first height, and the second distribution area 422 of the second height, and further includes the third virtual height having a virtual raised height of the third height. The three areas do not reach the virtual height.

[0059] As shown, the first side (right side, air side) of the cathode plate includes the plate surface area 410 of the first height, the first distribution area 421 of the second height, the flow field area 430 of the first height, and the second distribution area 422 of the second height, and further includes the third virtual height having a virtual raised height of the third height. The three areas do not reach the virtual height. Figures 6-7 And Figures 8-9 As shown, it can be understood that for the left water side, the first height, the second height, and the third virtual height are equivalent to making the cathode plate raised or virtually raised from the right side to the left side, and the raised height of the third virtual height is the largest. The raised height of the first height is the smallest, which can be understood as the reference surface. It can also be understood that for the right air side, the first height, the second height, and the third virtual height are equivalent to making the cathode plate raised or virtually raised from the left side to the right side, and the virtual raised height of the third virtual height is the largest. The raised height of the first height is the smallest, which can be understood as the reference surface.

[0060] As shown, the first side (right side, air side) of the cathode plate includes the plate surface area 410 of the first height, the first distribution area 421 of the second height, the flow field area 430 of the first height, and the second distribution area 422 of the second height, and further includes the third virtual height having a virtual raised height of the third height. The three areas do not reach the virtual height. Figures 8-9 As shown, the first side (right side, air side) of the cathode plate includes the plate surface area 410 of the first height, the first distribution area 421 of the second height, the flow field area 430 of the first height, and the second distribution area 422 of the second height, and further includes the third virtual height having a virtual raised height of the third height. The three areas do not reach the virtual height.

[0061] Figures 8-9 As shown, the first side (right side, air side) of the cathode plate includes the plate surface area 410 of the first height, the first distribution area 421 of the second height, the flow field area 430 of the first height, and the second distribution area 422 of the second height, and further includes the third virtual height having a virtual raised height of the third height. The three areas do not reach the virtual height.

[0062] Therefore, as shown, Figures 6-7 And Figures 8-9 ​As shown, the first height plane of the first side of the plate surface area 310, the third height plane of the second side of the plate surface area 410. The second height plane of the first side of the distribution area 420, the second height plane of the second side of the distribution area 320. The first height plane of the first side of the flow field area 430, the third height plane of the second side of the flow field area 330. That is, for the first side of the cathode plate, the virtual third height plane is the longest in the virtual height of the first side, and the virtual convex is the most convex. The distribution area 420 is the longest in the substantial height of the first side, which is equivalent to the most convex, and the flow field area 430 and the plate surface area 410 are the shortest in the substantial height of the first side, which is equivalent to the most flat, and can be understood as a reference surface. For the second side of the cathode plate, the plate surface area 310 and the flow field area 330 are the longest in the substantial convex height of the second side, which is equivalent to the most convex, and the distribution area 420 is the shortest in the substantial convex height of the second side, which is equivalent to the most flat, and the virtual first height plane is the shortest in the virtual height of the second side, and the virtual convex is the most flat, which can be understood as a reference surface.

[0063] As shown in the figure, Figures 8-9 As shown, the bottom surface 3312 of the water channel 331 of the flow field area 330 of the second side of the cathode plate is in the same plane as the virtual third height plane of the first side (right side, air side) of the cathode plate, and it can be understood that the height of the groove wall 3311 of the water channel 331 exceeds the second height plane where the distribution area 420 is located. Preferably, the bottom surface 3312 of the water channel can be in the same plane as the third virtual height plane, and the bottom surface 3312 of the water channel 331 is higher than the second height plane where the distribution area 420 is located and the first height plane where the flow field area 430 is located, so that the two water channels 331 of the flow field area 330 of the second side of the cathode plate are formed into air channels 332 with a first depth between the convex ridges on the back of the first side of the cathode plate and the flow field area 430 (as the bottom surface) of the first height plane of the first side of the cathode plate. The flow field area 430 of the first height plane is the air channel bottom surface 3321, and the first depth is the depth between the third virtual height plane and the first height plane. The flow field area 430 of the first height plane is spaced and formed into an air channel between the convexities (upper closed surface convexities) of the two water channels 331. It can be understood that the convexity of the water channel 331 refers to the shape of the back of the water channel.

[0064] As shown in the figure, Figures 8-9 As shown in the figure,

[0065] As described above, as shown in the figure, Figures 8-9As shown, in the first side (right side, air side) of the cathode plate, the gas channel 332 with the first depth is formed between the ridges on the back of the two water channels 331 of the flow field area 330 of the second side of the cathode plate and the flow field area 430 of the first height surface of the first side of the cathode plate, the flow field area 430 of the first height surface is the gas channel bottom surface 3321, the distribution area 420 at the second height surface is higher than the bottom surface 3321 of the gas channel of the flow field area 430 at the first height surface, and by the height difference, the distribution area 420 at the high position on this side guides the gas flow into the flow field area 430 at the lower position, that is, the gas channel 332.

[0066] The above-mentioned preferred uniform interval distance between the adjacent water channels 331 can further improve the uniformity of the water flow in the flow field area 330, and the gas channel 332 formed according to the water channel 331 can also improve the uniformity of the gas flow in the flow field area 430.

[0067] The above-mentioned purpose of the application is to not set the opening (gas, water inlet and outlet) in the width direction of the plate, but only set the relative opening in the length direction. However, in the two sides of the plate, the distribution area on one side is higher than the flow field area, so that the distribution area on the other side must be lower than the flow field area, and only setting the relative opening in the length direction cannot solve the synchronous and smooth flow of gas and water on the two sides. The distribution area 420 on the first side of the application is higher than the flow field area 430, so that the gas can flow from the distribution area 420 at the high position to the flow field area 430 at the low position. However, the distribution area 320 on the second side is lower than the flow field area 330, so that the water inlet of the distribution area 320 on the second side cannot smoothly flow into the flow field area 330. The application reduces the height of the water channel 331 on the second side relative to the distribution area 320 by the water channel 331, so that the water inlet can smoothly flow from the distribution area 320 at the low position to the flow field area 330 at the high position, and the synchronous and smooth flow of gas and water on the two sides of the plate can be realized. Moreover, the water channel 331 as the groove wall of the gas channel 332 is uniformly distributed on the first side of the plate, so that the gas flow can be guided and uniformly flowed in the flow field area 430. In addition, the water channel 331 can also play a supporting role between the membrane electrode on the opposite side of the side.

[0068] Among them, the plate surface area 210 of the third height surface on the second side (left side, hydrogen side) of the anode plate, the bottom surface 1312 of the water channel 131 at the third height surface, and the circular platform surface of the second reinforcing rib 152 at the third height surface are connected with the first membrane electrode to form the hydrogen side.

[0069] The first side (right side, water side) of the anode plate is connected with the second side (left side, water side) of the cathode plate through the frame area, wherein the circular platform surface of the first reinforcing rib 151 of the second height surface distribution area 220 of the first side (right side, water side) of the anode plate is abutted with the second height surface distribution area 320 of the second side (left side, water side) of the cathode plate, and the third height surface flow field area 130 of the first side (right side, water side) of the anode plate is connected with the third height surface flow field area 330 of the second side (left side, water side) of the cathode plate to form the water side, which can be understood as two half-opened groove-shaped water channel grooves being buckled.

[0070] The third height surface plate area 410 of the first side (right side, air side) of the cathode plate, the bottom surface 3312 of the water channel groove 331 at the third virtual height surface and the circular platform surface of the second reinforcing rib 352 at the virtual third height surface are connected with the second membrane electrode to form the air side.

[0071] The fuel cell single cell bipolar plate of the application comprises an anode plate and a cathode plate, and the single pole plate comprises a fluid inlet area, a fluid outlet area, a distribution area, a flow field area and a sealing area, and the inlet / outlet area has corresponding water inlets / outlets, hydrogen inlets / outlets and air inlets / outlets. The application solves the problem of the simultaneous passage of air, hydrogen and water through the fluid distribution area in three cavities by providing a fluid distribution area structure.

[0072] The height space formed by the bipolar plate distribution area is certain, that is, the sum of the groove heights of the pole plate flow field area, therefore, the design of the bipolar plate distribution area needs to divide the sum of the groove heights of the pole plate flow field area into three parts, which are respectively given to the hydrogen cavity, the air cavity and the water cavity for the passage of the fluid.

[0073] For the distribution area of the pole plate, it is necessary to ensure the uniformity of the distribution of the fluid in the chamber and to reduce the resistance of the fluid flowing in the distribution area, and the pole plate distribution area also needs to support the frame of the fuel cell single cell membrane electrode distribution area to avoid the deformation of the frame of the membrane electrode distribution area caused by the pressure difference in the hydrogen and air two side cavities.

[0074] The single cell bipolar plate of the fuel cell is divided into an anode plate and a cathode plate, and the distribution areas of the cathode and anode plates cooperate to form the distribution area of the entire single cell bipolar plate. The cathode and anode plates are both formed by stamping a metal material such as stainless steel or titanium material through a mold.

[0075] The anode plate fluid distribution area is respectively the hydrogen cavity and the water cavity from the two sides, and the overall groove depth of the anode plate distribution area is designed to be greater than the groove depth of the anode plate flow field area when viewed from the water cavity side, that is, the distribution area is lower than the flow field area when viewed from the water cavity side. In this case, water cannot flow from the distribution area to the flow field area.

[0076] The present application sets a groove with a depth greater than the distribution area in the flow field area for water channel, although the distribution area is lower than the flow field area, but the distribution area is higher than the groove of the flow field area, so that the water in the distribution area can flow into the groove of the flow field area.

[0077] As viewed from the water cavity side, the overall groove depth of the distribution area of the anode plate is designed to be greater than the groove depth of the flow field area of the anode plate, that is, the distribution area is lower than the flow field area as viewed from the water cavity side. As viewed from the hydrogen cavity side, the overall groove depth of the distribution area of the anode plate is less than the groove depth of the flow field area of the anode plate, that is, the distribution area is higher than the flow field area as viewed from the hydrogen cavity side. The height difference between the two can be set to Y=0.1~0.2mm, and the fluid channel formed by the height difference is the hydrogen gas flow channel of the anode hydrogen cavity, that is, on the hydrogen side, hydrogen gas can flow to the flow field area due to the height difference.

[0078] Therefore, the hydrogen side of the distribution area of the anode plate and the bottom of the groove of the flow field area form a height difference, and the water side of the distribution area of the anode plate and the ridge of the groove of the flow field area form an X-Y height difference, X being the groove depth of the flow field area. The fluid channel formed by the height difference is the water flow channel of the water cavity, and the two water flow channels form an air channel on the hydrogen side. The bottom surface of the fluid distribution area of the anode plate is between the ridge and the bottom of the groove of the flow field area, and forms a channel cross section for the fluid flow in the anode hydrogen cavity and the water cavity, respectively.

[0079] From the two sides of the fluid distribution area of the cathode plate, it is the cavity and the water cavity, respectively. As viewed from the water cavity side, the overall groove depth of the distribution area of the cathode plate is designed to be greater than the groove depth of the flow field area of the cathode plate, that is, the distribution area is lower than the flow field area as viewed from the water cavity side. In this case, water cannot flow from the distribution area to the flow field area.

[0080] The present application sets a groove with a depth greater than the distribution area in the flow field area for water channel, although the distribution area is lower than the flow field area, but the distribution area is higher than the groove of the flow field area, so that the water in the distribution area can flow into the groove of the flow field area.

[0081] As viewed from the water cavity side, the overall groove depth of the distribution area of the cathode plate is designed to be greater than the groove depth of the flow field area of the cathode plate, that is, the distribution area is lower than the flow field area as viewed from the water cavity side. As viewed from the air cavity side, the overall groove depth of the distribution area of the cathode plate is less than the groove depth of the flow field area of the cathode plate, that is, the distribution area is higher than the flow field area as viewed from the air cavity side. The height difference between the two can be set to Y=0.1~0.2mm, and the fluid channel formed by the height difference is the hydrogen gas flow channel of the anode hydrogen cavity, that is, on the hydrogen side, hydrogen gas can flow to the flow field area due to the height difference.

[0082] Thus, the air side of the cathode plate distribution area and the groove bottom of the flow field area form a height difference, and the water side of the anode plate distribution area and the groove ridge of the flow field area form an X-Y height difference, X being the groove depth of the flow field area. The fluid channel formed by the height difference is a water cavity water flow channel, and the two water cavity water flow channels are formed into air channels on the air side. The bottom surface of the cathode plate fluid distribution area is between the groove ridge and the groove bottom of the flow field area, and forms a channel cross section for fluid flow in the cathode plate cavity and the water cavity, respectively.

[0083] The anode plate fluid distribution area is designed with support reinforcing ribs. The reinforcing ribs are point-shaped stamping structures, the reinforcing rib groove top is a circular platform, and the reinforcing ribs are concave-convex in shape, that is, the anode hydrogen cavity gas side reinforcing ribs are opposite to the anode plate water side reinforcing ribs. The height of the anode hydrogen cavity gas side reinforcing ribs is consistent with the height of the anode plate plane, and the function is to support the membrane electrode distribution area anode side frame, preventing the frame from deforming and blocking the gas flow channel due to the gas pressure difference between the cathode and anode, thereby increasing the resistance.

[0084] The height of the anode plate water cavity side reinforcing ribs is higher than the plane of the anode plate water cavity side flow channel area, and the height is the depth of the cathode plate fluid distribution area water cavity side recess, that is, the anode plate water cavity side reinforcing rib groove top plane needs to be in contact with the cathode plate fluid distribution area water cavity side recess bottom surface of the assembled single cell bipolar plate, that is, the size needs to be matched. The design of the concave-convex reinforcing rib position on the anode plate fluid distribution area is based on the equidistant design of the plate distribution area shape. From the perspective of the anode plate gas side, the recessed reinforcing ribs, that is, the water side reinforcing ribs, are uniformly dispersed between the protruding reinforcing ribs, that is, the anode hydrogen cavity gas side reinforcing ribs. The distance between each protruding reinforcing rib, the distance between the protruding reinforcing rib and the recessed reinforcing rib, and the distance between each recessed reinforcing rib are consistent, which can effectively play a supporting role while ensuring uniform distribution of fluids in the two chambers.

[0085] The cathode plate fluid distribution area is designed with support reinforcing ribs. The reinforcing ribs are point-shaped stamping structures, the reinforcing rib groove top is a circular platform, and the reinforcing ribs are of the same orientation, that is, all face the cavity side. The height of the cathode plate hydrogen cavity gas side reinforcing ribs is consistent with the height of the cathode plate plane, and the function is to support the membrane electrode distribution area cathode side frame, preventing the frame from deforming and blocking the gas flow channel due to the gas pressure difference between the cathode and anode, thereby increasing the resistance.

[0086] The design of the reinforcing rib position on the cathode plate fluid distribution area is based on the equidistant design of the plate distribution area shape. The cathode plate fluid distribution area only has reinforcing ribs facing the air side, and the gap between the reinforcing ribs is the fluid distribution area plane. When the anode plate and the cathode plate are assembled, the reinforcing ribs on the anode plate fluid distribution area facing the water cavity side and the plane of the cathode plate fluid distribution area facing the water cavity side cooperate with each other to support the water cavity.

[0087] The reinforcing ribs of the anode plate fluid distribution area towards the hydrogen cavity gas side and the reinforcing ribs of the cathode plate fluid distribution area towards the cavity gas side maintain a corresponding position and size, which ensures that the single cell membrane electrode distribution area frame has sufficient support between the anode and cathode plate fluid distribution areas, preventing the frame from collapsing in any direction.

[0088] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0089] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0090] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0091] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

[0092] In the present application, the term "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents that the associated objects before and after it are in an "or" relationship. "At least one" means one or more; "at least one of A and B" is similar to "A and / or B", which describes the association relationship of the associated objects, which means that there can be three relationships, for example, at least one of A and B can represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0093] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0094] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacement or change according to the technical scheme and inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A fuel cell bipolar plate, comprising an anode plate and a cathode plate, characterized in that: in: The opening area of ​​the anode plate is relatively arranged in the first direction of the electrode plate, and the opening area of ​​the cathode plate is relatively arranged in the first direction of the electrode plate; The second side of the anode plate and the first side of the first membrane electrode are formed as a hydrogen side, the first side of the anode plate and the second side of the cathode plate are formed as a water side, and the first side of the cathode plate and the second side of the second membrane electrode are formed as an air side.

2. The fuel cell bipolar plate according to claim 1, characterized in that: in, The first side of the anode plate includes a plate surface area at a first height plane, a distribution area at a second height plane, and a flow field area at a third height plane, wherein the third height plane is higher than the second height plane, and the second height plane is higher than the first height plane; The flow field area on the first side of the anode plate is provided with at least two water channels spaced apart in the width direction thereof; The water channel is a groove formed concavely from the third height plane where the flow field area on the first side of the anode plate is located toward the first height plane where the plate surface area on the first side of the anode plate is located; the water channel includes a groove wall and a bottom surface, and the bottom surface of the water channel and the first height plane where the plate surface area on the first side of the anode plate is located are in the same plane, so that the water channel has a first depth; The interface between the distribution area on the first side of the anode plate and the flow field area on the first side of the anode plate has a certain height difference, and a water outlet is set at the interface on the first side of the anode plate. The water outlet on the first side of the anode plate connects the distribution area on the first side of the anode plate and the water channel of the flow field area on the first side of the anode plate.

3. The fuel cell bipolar plate according to claim 2, characterized in that: The distances between adjacent water channels on the first side of the anode plate are uniform.

4. The fuel cell bipolar plate according to claim 2, characterized in that: in, The second side of the anode plate includes a plate surface area at a third height plane, a distribution area at a second height plane, and a flow field area at a first height plane; wherein the third height plane is higher than the second height plane, and the second height plane is higher than the first height plane; The bottom surface of the water channel in the flow field area on the first side of the anode plate and the third height plane where the plate surface area on the second side of the anode plate is located are in the same plane; The two water channels in the flow field area on the first side of the anode plate are formed as ridges on the two back surfaces of the second side of the anode plate, and the flow field area on the first height surface of the second side of the anode plate is formed as an air channel with a first depth, and the flow field area on the first height surface of the second side of the anode plate is the bottom surface of the air channel; The interface between the distribution area and the flow field area on the second side of the anode plate has a certain height difference.

5. The fuel cell bipolar plate according to claim 4, characterized in that: in, A reinforcement rib is provided in the distribution area on the first side of the anode plate, the reinforcement rib is arranged in a groove shape, and the groove top is a circular platform; The reinforcing ribs include a first reinforcing rib and a second reinforcing rib, wherein: The first reinforcing rib protrudes toward the first side of the anode plate, and the circular platform surface is higher than the third height surface of the first side of the anode plate; The second reinforcing rib protrudes toward the second side of the anode plate, and the circular platform surface is located at a third height surface of the second side of the anode plate.

6. The fuel cell bipolar plate according to claim 5, characterized in that: The first reinforcing ribs and the second reinforcing ribs are alternately arranged in rows along the width direction of the distribution area of ​​the first side of the anode plate.

7. The fuel cell bipolar plate according to any one of claims 1 to 6, characterized in that: in, The second side of the cathode plate includes a plate surface area at a third height plane, a distribution area at a second height plane, a flow field area at the third height plane, and a first virtual height plane; wherein the third height plane is higher than the second height plane, and the second height plane is higher than the first virtual height plane; The flow field area on the second side of the cathode plate is provided with at least two water channels spaced apart in the width direction. The water channel on the second side of the cathode plate is a groove formed concavely from a third height plane where the flow field area on the second side of the cathode plate is located toward the first virtual height plane on the second side of the cathode plate, the water channel including a groove wall and a bottom surface, the bottom surface of the water channel and the first virtual height plane on the second side of the cathode plate being in the same plane, so that the water channel has a first depth; The interface between the distribution area on the second side of the cathode plate and the flow field area on the second side of the cathode plate has a certain height difference, and a water outlet is set at the interface on the second side of the cathode plate. The water outlet on the second side of the cathode plate connects the water outlet distribution area and the water channel of the flow field area on the second side of the cathode plate.

8. The fuel cell bipolar plate according to claim 7, characterized in that: The distances between adjacent water channels on the second side of the cathode plate are consistent.

9. The fuel cell bipolar plate according to claim 7, characterized in that: in, The first side of the cathode plate includes a plate surface area at a first height plane, a distribution area at a second height plane, a flow field area at the first height plane, and a third virtual height plane; wherein the third virtual height plane is higher than the second height plane, and the second height plane is higher than the first height plane; The bottom surface of the water channel provided in the flow field area on the second side of the cathode plate and the third virtual height surface on the first side of the cathode plate are in the same plane; The two water channels in the flow field area on the second side of the cathode plate are formed as two ridges on the back side of the first side of the cathode plate, and the flow field area on the first height surface of the first side of the cathode plate is formed as an air channel with a first depth, and the flow field area on the first height surface of the first side of the cathode plate is the bottom surface of the air channel; An interface between the distribution area on the first side of the cathode plate and the flow field area on the first side of the cathode plate has a certain height difference.

10. The fuel cell bipolar plate according to claim 9, characterized in that: in, A reinforcement rib is provided in the distribution area on the second side of the cathode plate, the reinforcement rib is provided in a groove shape, and the groove top is a circular platform; The reinforcing ribs include second reinforcing ribs, the second reinforcing ribs protrude toward the first side of the cathode plate, and the circular platform surface is located at the third virtual height surface of the first side of the cathode plate; Preferably, the second reinforcing ribs are arranged in rows along the width direction of the distribution area on the second side of the cathode plate; The position of the second reinforcing rib of the distribution area on the second side of the cathode plate corresponds to the position of the first reinforcing rib of the distribution area on the first side of the anode plate; the first reinforcing rib of the distribution area on the first side of the anode plate is raised toward the first side of the anode plate, and the circular platform surface is higher than the third height surface of the first side of the anode plate, and is against the surface of the distribution area on the second side of the cathode plate.

11. The fuel cell bipolar plate according to claim 9, characterized in that: in, The plate surface area at the third height plane of the second side of the anode plate, the bottom surface of the water channel at the third height plane of the second side of the anode plate, and the circular platform surface of the second reinforcing rib at the third height plane of the second side of the anode plate are connected to the first membrane electrode to form a hydrogen side; The first side of the anode plate is connected to the second side of the cathode plate via a frame area, the circular platform surface of the first reinforcing rib of the distribution area of ​​the second height surface of the first side of the anode plate is offset against the distribution area of ​​the second height surface of the second side of the cathode plate, and the flow field area of ​​the third height surface of the first side of the anode plate is connected to the flow field area of ​​the third height surface of the second side of the cathode plate to form a water side; Among them, the plate surface area of ​​the third height plane on the first side of the cathode plate, the bottom surface of the water channel on the first side of the cathode plate at the third virtual height plane, and the circular platform surface of the second reinforcing rib on the first side of the cathode plate at the third virtual height plane are connected to the second membrane electrode to form the air side.

12. Use of any fuel cell bipolar plate according to any one of claims 1 to 11 in a new energy vehicle battery.

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