High-power-density fuel cell guide plate
By improving the design of the cooling flow path in the fuel cell flow guide plate, cooling liquid flows in from the middle of the bipolar plate, and designing the cooling flow path into two symmetrical and parallel parts, the problems of coolant flow, insufficient short side strength, increased invalid area and uneven temperature distribution in the prior art are solved, and high power density and uniform temperature distribution are achieved.
Patent Information
- Application Number
- CN202421175187.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-05-27
AI Technical Summary
The inlet and outlet arrangement of the existing fuel cell bipolar plates leads to coolant flow, insufficient short side strength, increased invalid area and uneven temperature distribution, affecting the power density and stack performance of the fuel cell.
A high-power density fuel cell flow guide plate is designed. By improving the design of the cooling flow channel in the diffused bipolar plate, the cooling liquid with a lower temperature flows in the middle of the bipolar plate, reducing the intermediate temperature; at the same time, the cooling flow channel is designed as two parts in symmetrical and parallel connections, reducing the cooling liquid flow resistance and ensuring the uniformity of the cooling liquid flow rate in each cooling flow channel.
Effectively reduce the flow resistance of the coolant, enhance the heat dissipation ability of the plate center, improve the uniformity of the plate temperature distribution, improve the structural strength and sealing performance of the plate, increase the proportion of the active area of the plate, and increase the power density of the fuel cell.
Smart Images
Figure CN222801817U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of fuel cell design, and in particular relates to a high power density fuel cell guide plate. Background Art
[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.
[0003] Proton exchange membrane fuel cell (PEMFC) has the advantages of high efficiency, high specific energy, low pollution, etc., and is an ideal power source. The bipolar plate (flow field plate) is an important component of the proton exchange membrane fuel cell, and its mass accounts for more than 60% of the battery stack. The design of the flow field plate has a great influence on the battery performance, operating efficiency and manufacturing cost.
[0004] There are flow channels machined on both sides of the bipolar plate, which play an important role in distributing the reaction gas, collecting current, mechanical support, hydrothermal management, and separating the positive and negative electrode reaction gases. In fact, the design of the fuel cell stack is largely the design of the bipolar plate. The proper flow channel design on the bipolar plate can effectively improve the battery performance. The bipolar plate is also called a guide bipolar plate, which is composed of an air guide groove plate and a hydrogen guide groove plate, and is provided with channels for the inlet and outlet of air, hydrogen, and cooling fluid.
[0005] At present, the common flow channels for air, hydrogen and cooling liquid in the bipolar plates of fuel cells are generally arranged along the short sides of the rectangular bipolar plates, or two of the flow channels are arranged on the long sides of the rectangular bipolar plates and close to the two sides of the short sides. The former arrangement is not only easy to cause the coolant to flow into the common flow channels of hydrogen or air, but also easy to cause insufficient strength on the short sides; the latter arrangement is easy to increase the ineffective area of the bipolar plates, which will cause the power density of the fuel cell stack to decrease. Moreover, for the above two types of bipolar plates, the cooling liquid inlet and outlet are generally arranged symmetrically. For example, patent CN111370727 proposes a fuel cell guide plate with high power density and high structural strength, which adopts the latter arrangement. The two pairs of cooling liquid inlets and outlets are arranged symmetrically. However, this arrangement makes the inlets and outlets far apart, and the flow channels are mostly straight or S-shaped, which easily causes a large difference in the inlet and outlet temperatures of the cooling liquid. At the same time, since the bipolar plates are generally rectangular, the heat dissipation in the center of the bipolar plates is poorer than that on the two sides, and the temperature is higher, which easily causes uneven temperature distribution of the bipolar plates. The existing design cannot solve the problem of uneven temperature distribution. Due to the above temperature influence, the performance of the entire fuel cell stack is easily affected. Utility Model Content
[0006] In view of the above-mentioned problems and defects existing in the prior art, the utility model provides a high power density fuel cell guide plate. By improving the design of the cooling channel in the guide bipolar plate, a cooling liquid with a lower temperature flows in from the middle of the bipolar plate, which greatly reduces the temperature in the middle of the bipolar plate and avoids uneven temperature. At the same time, the cooling channel is designed as two symmetrical and parallel parts, which can greatly reduce the coolant flow resistance. Moreover, the lengths of the inner and outer cooling channels in each part are comparable, which can ensure the uniformity of the cooling liquid flow rate in each cooling channel and further improve the temperature uniformity.
[0007] A high power density fuel cell guide plate, the guide plate is a guide bipolar plate, the guide bipolar plate is composed of an air guide groove plate and a hydrogen guide groove plate bonded together, and four cooling fluid flow channels are arranged in the interlayer formed by the reverse side of the air guide groove plate and the reverse side of the hydrogen guide groove plate;
[0008] Two pairs of symmetrical cooling liquid common inlets and outlets are provided on one side of the long side of the guide bipolar plate, and the four cooling fluid flow channels are divided into two symmetrical groups, two by two, and each group of cooling fluid flow channels is matched and connected with a pair of cooling liquid common inlets and outlets; the two cooling fluid flow channels in each group are isolated from each other and divided into inner and outer cooling fluid flow channels, and the lengths of the inner and outer cooling fluid flow channels are equal.
[0009] According to a further technical solution, the inner cooling fluid flow channel close to the common inlet and outlet of the cooling fluid is in an I-shape, and the outer cooling fluid flow channel away from the common inlet and outlet of the cooling fluid is in a door-shape.
[0010] A further technical solution is that the guide bipolar plate is rectangular, and three protrusions extend along the long side of the rectangle and on one side away from the common hydrogen outlet channel, and the three protrusions are respectively located at symmetrical positions on both sides of the rectangular bipolar plate close to the wide side and in the middle position of one side of the long side of the bipolar plate; the protrusion at the middle position is provided with two common inlets for cooling fluid that are isolated from each other and symmetrical with respect to the symmetry axis of the long side of the bipolar plate, and the protrusions at the two side positions are each provided with a common outlet for cooling fluid.
[0011] A further technical solution is that the cooling fluid common inlet on the left side of the middle position and the cooling fluid common outlet on the left side are a pair of cooling liquid common inlets and outlets; the cooling fluid common inlet on the right side of the middle position and the cooling fluid common outlet on the right side are a pair of cooling liquid common inlets and outlets; the two pairs of cooling liquid common inlets and outlets are symmetrical with respect to the long side symmetry axis of the bipolar plate.
[0012] According to a further technical solution, common channels for air and hydrogen to enter and exit are arranged at the left and right ends of the guide plate along the short sides of the rectangle, and the distribution order of the common channels at the left and right ends along the short sides of the rectangle is opposite.
[0013] According to a further technical solution, the left end of the guide plate is provided with common air inlet channels and common hydrogen outlet channels in sequence along the short side of the rectangle; the right end of the guide plate is provided with common hydrogen inlet channels and common air outlet channels in sequence along the short side of the rectangle.
[0014] A further technical solution is that the front side of the air guide groove plate is provided with an air guide groove and air inlet and outlet air flow channel holes, the air inlet common channel is connected to the air inlet air flow channel holes, the air outlet common channel is connected to the air outlet air flow channel holes, and the air inlet air flow channel holes are connected to the air outlet air flow channel holes through the air guide grooves;
[0015] A hydrogen guide groove and hydrogen inlet and outlet flow channel holes are provided on the front side of the hydrogen guide groove plate. The hydrogen inlet common channel is connected to the hydrogen inlet flow channel holes, the hydrogen outlet common channel is connected to the hydrogen outlet flow channel holes, and the hydrogen inlet flow channel holes are connected to the hydrogen outlet flow channel holes through the hydrogen guide groove.
[0016] According to a further technical solution, the size of the hydrogen outlet common hole is smaller than the size of the hydrogen inlet common hole.
[0017] According to a further technical solution, a positioning hole for assembling the battery stack and two grooves for placing a voltage collection metal sheet are provided on the left side of the hydrogen outlet common channel on the guide bipolar plate.
[0018] According to a further technical solution, the common air intake channel is divided into two parts along the short side of the rectangle.
[0019] Compared with the prior art, the utility model has the following beneficial effects:
[0020] 1. The utility model provides a high power density fuel cell guide plate. By improving the design of the cooling flow channel in the guide bipolar plate, the flow resistance of the coolant can be effectively further reduced, the heat dissipation capacity of the center of the plate can be enhanced, and the uniformity of the temperature distribution of the plate can be improved. At the same time, compared with the prior art, the structure improves the structural strength and sealing performance of the plate while ensuring the power density of the plate, which is beneficial to improve the reliability of the system, increase the proportion of the active area of the plate, and improve the power density of the plate.
[0021] 2. In the utility model, the guide bipolar plate is generally rectangular, and three protrusions extend along one side of the long side of the rectangle. The protrusion in the middle is provided with two mutually isolated and bilaterally symmetrical cooling fluid common inlets relative to the symmetry axis of the long side of the bipolar plate, and the protrusions on both sides are provided with a cooling fluid common outlet. Through this design, the cooling liquid with a lower temperature can flow in from the middle of the bipolar plate, greatly reducing the temperature in the middle of the bipolar plate (the middle area has the highest temperature because the heat cannot be discharged in time), and avoiding uneven temperature.
[0022] 3. In the present invention, two symmetrical sets of cooling fluid flow channels are designed in parallel, which can greatly reduce the flow resistance of the coolant, increase the coolant flow rate under the same flow rate and pressure, and thus increase the heat dissipation capacity.
[0023] 4. In the utility model, the lengths of the two inner and outer cooling fluid flow channels in each group are comparable. This design can ensure the uniformity of the cooling liquid flow rate in each cooling flow channel, further improving the temperature uniformity. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.
[0025] Figure 1 It is a schematic diagram of the reverse side of the air guide groove plate in the high power density fuel cell guide plate of the utility model;
[0026] Figure 2 It is a front schematic diagram of the air guide groove plate in the high power density fuel cell guide plate of the utility model;
[0027] Figure 3 It is a schematic diagram of the reverse side of the hydrogen flow guide plate in the high power density fuel cell flow guide plate of the utility model;
[0028] Figure 4 It is a front schematic diagram of the hydrogen guide groove plate in the high power density fuel cell guide plate of the utility model.
[0029] Among them, 0. air guide groove plate; 1. air inlet flow channel hole; 2. cooling fluid common outlet; 3. cooling fluid common inlet; 4. hydrogen inlet common channel; 5. hydrogen inlet and outlet air guide grooves; 6. air outlet common channel; 7. air inlet and outlet air guide grooves; 8. air outlet flow channel hole; 9. external cooling fluid flow channel; 10. internal cooling fluid flow channel; 11. positioning hole; 12. groove; 13. hydrogen outlet common channel; 14. air inlet common channel; 15. hydrogen guide groove plate; 16. hydrogen inlet flow channel hole; 17. hydrogen outlet flow channel hole; 18. hydrogen guide groove; 19. air guide groove. DETAILED DESCRIPTION
[0030] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.
[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0032] The utility model proposes a high-power density fuel cell guide plate capable of reducing the flow resistance of the coolant and improving the consistency of the temperature distribution of the plate. The guide plate is a guide bipolar plate, which is composed of an air guide slot plate 0 and a hydrogen guide slot plate 15 bonded together, and four cooling fluid flow channels are in the interlayer formed by the reverse side of the air guide slot plate 0 and the reverse side of the hydrogen guide slot plate 15. Among them, the guide bipolar plate is provided with channels for the inlet and outlet of air, hydrogen, and cooling fluid, and a guide slot for connecting the inlet and outlet of air, hydrogen, and fluid channels; the air guide slot plate 0 refers to a plate provided with channels for the inlet and outlet of air, and the hydrogen guide slot plate 15 refers to a plate provided with channels for the inlet and outlet of hydrogen.
[0033] Further, such as Figure 1 to Figure 4 As shown, two pairs of symmetrical cooling liquid common inlets and outlets are provided on one side of the long side of the guide bipolar plate. Specifically, the guide bipolar plate is rectangular, and three protruding parts extend along the long side of the rectangle and away from the hydrogen outlet common channel. The three protruding parts are respectively located at the symmetrical positions on both sides of the rectangular bipolar plate close to the wide side and the middle position on one side of the long side of the bipolar plate; the protruding part at the middle position is provided with two cooling fluid common inlets 3 that are isolated from each other and symmetrical with respect to the symmetry axis of the long side of the bipolar plate, and the protruding parts at the two side positions are each provided with a cooling fluid common outlet 2. The cooling fluid common inlet 3 on the left side of the middle position and the cooling fluid common outlet 2 on the left side are a pair of cooling liquid common inlets and outlets; the cooling fluid common inlet 3 on the right side of the middle position and the cooling fluid common outlet 2 on the right side are a pair of cooling liquid common inlets and outlets; the two pairs of cooling liquid common inlets and outlets are symmetrical with respect to the symmetry axis of the long side of the bipolar plate. Through this design, the cooling liquid with a lower temperature can flow into the middle of the bipolar plate, greatly reducing the temperature in the middle of the bipolar plate (the middle area has the highest temperature because the heat cannot be discharged in time), and avoiding uneven temperature.
[0034] On the back of the air guide groove plate 0 and the hydrogen guide groove plate 15, four cooling fluid flow channels are divided into two symmetrical groups, two by two, and the two cooling fluid flow channels in each group are isolated from each other and divided into an inner cooling fluid flow channel 10 and an outer cooling fluid flow channel 9. Each group of cooling fluid flow channels is matched and connected with a pair of cooling liquid common inlets and outlets, such as Figure 1As shown, the two cooling fluid flow channels in the left group are matched and connected with the pair of cooling liquid common inlets and outlets on the left, and the two ends of the inner and outer cooling fluid flow channels are respectively connected with the pair of cooling liquid common inlets and outlets; the two cooling fluid flow channels in the right group are matched and connected with the pair of cooling liquid common inlets and outlets on the right, and the two ends of the inner and outer cooling fluid flow channels are respectively connected with the pair of cooling liquid common inlets and outlets. The two symmetrical groups of cooling fluid flow channels are designed in parallel, which can greatly reduce the flow resistance of the cooling liquid, increase the flow rate of the cooling liquid at the same flow rate and pressure, and thus increase the heat dissipation capacity.
[0035] Furthermore, the lengths of the two cooling fluid channels in each group are equal, or the length of the outer cooling fluid channel 9 in each group is slightly greater than the length of the inner cooling fluid channel 10 (used to compensate for local pressure loss). In the present invention, the inner cooling fluid channel 10 close to the common inlet and outlet of the cooling fluid is in an I-shape, and the outer cooling fluid channel 9 away from the common inlet and outlet of the cooling fluid is in a gate shape. Through the above design, the lengths of the inner and outer cooling channels in each part are equal, which can ensure the uniformity of the cooling liquid flow rate in each cooling channel and further improve the uniformity of the temperature.
[0036] Furthermore, the left and right ends of the guide plate are provided with common channels for air and hydrogen to enter and exit along the short sides of the rectangle, and the distribution order of the common channels at the left and right ends along the short sides of the rectangle is opposite. Specifically, the left end of the guide plate is provided with an air inlet common channel 14 and a hydrogen outlet common channel 13 along the short sides of the rectangle; the right end of the guide plate is provided with a hydrogen inlet common channel 4 and an air outlet common channel 6 along the short sides of the rectangle. The above-mentioned common channels for cooling fluid to enter and exit are located at three protrusions extending from one side of the long side of the rectangular guide bipolar plate, and are separated from the common channels for hydrogen and air of the guide bipolar plate, so as to maximize the ratio of the effective area of the bipolar plate while ensuring that the cooling liquid cannot penetrate into it.
[0037] Among them, the front side of the air guide groove plate 0 is provided with an air guide groove 19 and an air inlet and outlet air flow channel hole, the air inlet common channel 14 is connected to the air inlet air flow channel hole 1 through the air inlet and outlet air guide groove 7 (the air inlet and outlet air guide groove 7 is arranged on the back side of the air guide groove plate 0), the air outlet common channel 6 is connected to the air outlet air flow channel hole 8 through the air inlet and outlet air guide groove 7, and the air inlet air flow channel hole 1 is connected to the air outlet air flow channel hole 8 through the air guide groove 19;
[0038] The front side of the hydrogen guide trough plate 15 is provided with a hydrogen guide groove 18 and a hydrogen inlet and outlet flow channel hole. The back side of the hydrogen guide trough plate 15 is a plain plate, and a hydrogen inlet and outlet flow channel hole is provided at a position on the back side corresponding to the front side. The hydrogen inlet common channel 4 is connected to the hydrogen inlet flow channel hole 16 through the hydrogen inlet and outlet gas guide groove 5 (the hydrogen inlet and outlet gas guide groove 5 is arranged on the back side of the hydrogen guide trough plate 15), the hydrogen outlet common channel 13 is connected to the hydrogen outlet flow channel hole 17 through the hydrogen inlet and outlet gas guide groove 5, and the hydrogen inlet flow channel hole 16 is connected to the hydrogen outlet flow channel hole 17 through the hydrogen guide groove 18.
[0039] Preferably, the air flow groove is curved to increase back pressure and improve air utilization efficiency; the hydrogen flow groove is straight. Since the hydrogen inlet is small, the pressure is also large when the flow rate is large, and the straight line design can effectively alleviate the pressure.
[0040] Based on the above design, air enters from the air inlet common channel 14, passes through the air inlet and outlet guide grooves 7 on the back of the air guide groove plate and is connected with the air inlet flow channel hole 1 on the front of the air guide groove plate, enters the air guide groove 19, passes through the curved air guide groove 19 and is connected with the air outlet flow channel hole 8 on the front of the air guide groove plate, and flows out to the air outlet common channel 6 through the air inlet and outlet guide grooves 7 on the back of the air guide groove plate;
[0041] Similarly, hydrogen enters from the hydrogen gas inlet common channel 4, passes through the hydrogen gas inlet and outlet grooves 5 on the back side of the hydrogen gas flow groove plate and is connected with the hydrogen gas inlet flow channel hole 16 on the front side of the hydrogen gas flow groove plate, enters the hydrogen gas guide groove 18, passes through the curved hydrogen gas guide groove 18 and is connected with the hydrogen gas outlet flow channel hole 17 on the front side of the hydrogen gas guide groove plate, and flows out to the hydrogen gas outlet common channel 13 through the hydrogen gas inlet and outlet grooves 5 on the back side of the hydrogen gas guide groove plate.
[0042] Furthermore, on the guide plate proposed by the utility model, the three raised portions are located on the long side of the rectangle and away from the side of the hydrogen outlet common channel 13. According to the air intake principle of the fuel cell bipolar plate in and out, the raised portions are located on the upper side after the stack is laid flat after assembly, that is, the bottom layer is flat. This design is beneficial to the stability of the stack after installation, thereby improving the system reliability.
[0043] Furthermore, the common air inlet and outlet channels are divided into two parts along the short side of the rectangle. This structure is beneficial to increasing the strength of the left and right sides of the rectangular plate while increasing the air flow rate and improving the reaction efficiency. On this basis, two air inlet and outlet flow channel holes are correspondingly arranged in each part, and each air inlet and outlet flow channel hole is connected through an air guide groove 19. The utility model has a total of four mutually isolated air guide grooves 19 to facilitate air circulation. The size of the above-mentioned hydrogen outlet common channel 13 is smaller than that of the hydrogen inlet common channel 4, which is beneficial to increase the back pressure on the hydrogen side, enhance the diffusion of hydrogen toward the membrane electrode, and thus improve the reaction efficiency.
[0044] In addition, on the above-mentioned guide bipolar plate, on the left side of the hydrogen outlet common channel 13, a positioning hole 11 for battery stack assembly and two grooves 12 for placing voltage collection metal sheets are provided. This design facilitates the staggered use of voltage sampling lines and prevents the risk of short circuit caused by the close distance between the sampling lines.
[0045] The fuel cell guide plate proposed by the utility model can effectively further reduce the flow resistance of the coolant, enhance the heat dissipation capacity of the center of the plate, and improve the uniformity of the temperature distribution of the plate. At the same time, compared with the prior art, the structure improves the structural strength and sealing performance of the plate while ensuring the power density of the plate, which is beneficial to improve the reliability of the system, increase the proportion of the active area of the plate, and improve the power density of the plate.
[0046] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.
Claims
1. A high power density fuel cell guide plate, characterized in that: The guide plate is a guide bipolar plate, which is composed of an air guide slot plate and a hydrogen guide slot plate bonded together, and four cooling fluid flow channels are arranged in the interlayer formed by the reverse side of the air guide slot plate and the reverse side of the hydrogen guide slot plate; Two pairs of symmetrical cooling liquid common inlets and outlets are provided on one side of the long side of the guide bipolar plate, and the four cooling fluid flow channels are divided into two symmetrical groups, two by two, and each group of cooling fluid flow channels is matched and connected with a pair of cooling liquid common inlets and outlets; the two cooling fluid flow channels in each group are isolated from each other and divided into inner and outer cooling fluid flow channels, and the lengths of the inner and outer cooling fluid flow channels are equal.
2. A high power density fuel cell guide plate as claimed in claim 1, characterized in that: The inner cooling fluid flow channel close to the common inlet and outlet of the cooling fluid is in an I-shape, and the outer cooling fluid flow channel far from the common inlet and outlet of the cooling fluid is in a gate shape.
3. A high power density fuel cell guide plate as claimed in claim 1, characterized in that: The guide bipolar plate is rectangular, and three protruding parts extend along the long side of the rectangle and away from the side of the hydrogen outlet common channel. The three protruding parts are respectively located at symmetrical positions on both sides of the rectangular bipolar plate close to the wide side and in the middle position of one side of the long side of the bipolar plate; the protruding part at the middle position is provided with two cooling fluid common inlets that are isolated from each other and symmetrical with respect to the symmetry axis of the long side of the bipolar plate, and the protruding parts at the two side positions are each provided with a cooling fluid common outlet.
4. A high power density fuel cell guide plate as claimed in claim 3, characterized in that: The cooling fluid common inlet on the left side of the middle position and the cooling fluid common outlet on the left side form a pair of cooling liquid common inlets and outlets; the cooling fluid common inlet on the right side of the middle position and the cooling fluid common outlet on the right side form a pair of cooling liquid common inlets and outlets; the two pairs of cooling liquid common inlets and outlets are symmetrical with respect to the long side symmetry axis of the bipolar plate.
5. A high power density fuel cell guide plate as claimed in claim 1, characterized in that: The left and right ends of the guide plate are provided with common channels for air and hydrogen to enter and exit along the short sides of the rectangle, and the distribution order of the common channels at the left and right ends along the short sides of the rectangle is opposite.
6. A high power density fuel cell guide plate as claimed in claim 5, characterized in that: The left end of the guide plate is provided with an air intake common channel and a hydrogen outlet common channel in sequence along the short side of the rectangle; the right end of the guide plate is provided with a hydrogen intake common channel and an air outlet common channel in sequence along the short side of the rectangle.
7. A high power density fuel cell guide plate as claimed in claim 6, characterized in that: The front side of the air guide groove plate is provided with an air guide groove and air inlet and outlet air passage holes, the air inlet common passage is connected to the air inlet air passage hole, the air outlet common passage is connected to the air outlet air passage hole, and the air inlet air passage hole is connected to the air outlet air passage hole through the air guide groove; A hydrogen guide groove and hydrogen inlet and outlet flow channel holes are provided on the front side of the hydrogen guide groove plate. The hydrogen inlet common channel is connected to the hydrogen inlet flow channel holes, the hydrogen outlet common channel is connected to the hydrogen outlet flow channel holes, and the hydrogen inlet flow channel holes are connected to the hydrogen outlet flow channel holes through the hydrogen guide groove.
8. A high power density fuel cell guide plate as claimed in claim 6, characterized in that: The size of the hydrogen outlet common hole is smaller than that of the hydrogen inlet common hole.
9. A high power density fuel cell guide plate as claimed in claim 6, characterized in that: The guide bipolar plate is provided with a positioning hole for stack assembly and two grooves for placing a voltage collection metal sheet on the left side of the hydrogen outlet common channel.
10. A high power density fuel cell guide plate as claimed in claim 6, characterized in that: The air intake common channel is divided into two parts along the short side of the rectangle.