Graphite bipolar plate structure

Abstract

The utility model relates to the technical field of fuel cells, and particularly discloses a graphite bipolar plate structure, which comprises an anode plate, an anode gas tank arranged on the front side of the anode plate, an anode gas guide strip arranged in the anode gas tank, an anode liquid guide groove arranged on the back side of the anode plate, and an anode liquid guide strip arranged in the anode liquid guide groove. The position of the anode liquid diversion trench corresponds to the position of the anode gas diversion strip; a cathode gas groove is formed in the front surface of the cathode plate, a cathode gas guide strip is arranged in the cathode gas groove, a cathode liquid groove is formed in the back surface of the cathode plate, a cathode liquid guide groove is formed in the cathode liquid groove, and the position of the cathode liquid guide groove corresponds to the position of the cathode gas guide strip; wherein the back surface of the anode plate is attached to the back surface of the cathode plate. The utility model has the advantages that the thicknesses of the anode plate and the cathode plate can be effectively reduced, so that the weight of the galvanic pile is reduced, the volume of the galvanic pile is reduced, and the power density is improved.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, and in particular to a graphite bipolar plate structure. Background Technology

[0002] A hydrogen fuel cell stack consists of individual cells connected in series, with each cell comprising a bipolar plate and a membrane electrode assembly (MEA). The bipolar plate, as the core component of the fuel cell, primarily supports the fuel cell, provides reactant gases and coolant, and conducts electricity and heat. Its performance largely depends on the structure of the bipolar plate distribution region and the flow field region.

[0003] A bipolar plate structure generally consists of gas inlet / outlet channels, a distribution zone, and a flow field reaction zone. The inlet / outlet channels introduce hydrogen, air, and coolant into and out of the bipolar plate. The distribution zone evenly distributes hydrogen, air, and coolant into the flow field reaction zone. The flow field reaction zone is in contact with the catalyst-containing area of ​​the membrane electrode assembly, providing the reaction gases and air while carrying away the reaction product water. The reaction gases enter the active zone after passing through the bipolar plate distribution zone from the inlet, causing a chemical reaction in the fuel cell to generate electricity.

[0004] In fuel cell systems, the thickness of the bipolar plates affects the overall volume and power density of the stack. Currently, the liquid in graphite bipolar plates is often guided by raised frustum structures or flow guide strips. Such structures result in a relatively large bipolar plate thickness, thus affecting the overall volume and power density of the stack. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to provide a graphite bipolar plate structure that can effectively reduce the thickness of the anode plate and the cathode plate, thereby reducing the weight of the fuel cell stack, reducing the volume of the fuel cell stack, and increasing the power density.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A graphite bipolar plate structure comprising:

[0008] An anode plate is provided with an anode gas groove on its front side, and an anode gas guide strip is provided inside the anode gas groove. An anode liquid guide groove is provided on the back side of the anode plate, and the position of the anode liquid guide groove corresponds to the position of the anode gas guide strip.

[0009] A cathode plate has a cathode gas groove on its front side, and a cathode gas guide strip inside the cathode gas groove. A cathode liquid groove is provided on the back side of the cathode plate, and a cathode liquid guide groove is provided inside the cathode liquid groove. The position of the cathode liquid guide groove corresponds to the position of the cathode gas guide strip.

[0010] The back side of the anode plate is attached to the back side of the cathode plate.

[0011] Compared to existing technologies, this application effectively utilizes the thickness of the guide strips by placing the anode liquid guide groove at the position corresponding to the anode gas guide strip and placing the cathode liquid guide groove at the position corresponding to the cathode gas guide strip. This effectively reduces the thickness of the anode plate and cathode plate, reduces the weight and volume of the fuel cell stack, and thus improves the power density.

[0012] As a preferred embodiment of this utility model, the anode gas guide bar includes an anode gas flow field bar, which is disposed in the anode gas groove, and anode gas distribution bars are provided at both ends of the anode gas flow field bar.

[0013] By adopting the above scheme, the gas distribution within the anode plate is optimized through the setting of the anode gas distribution strip and the anode gas flow field strip, thereby enhancing the gas utilization rate and improving the performance of the fuel cell.

[0014] As a preferred embodiment of this utility model, the anolyte flow channel includes an anolyte distribution channel and an anolyte flow field channel. The position of the anolyte distribution channel corresponds to the position of the anolyte gas distribution strip, and the position of the anolyte flow field channel corresponds to the position of the anolyte gas flow field strip.

[0015] By adopting the above scheme, the thickness of the anode gas distribution strip and the anode gas flow field strip can be fully utilized through the setting of the anode liquid distribution tank and the anode gas flow field strip. Corresponding channels are opened at their corresponding positions, so that the anode liquid distribution tank and the anode liquid flow field strip are located inside the ridge of the anode gas distribution strip and the anode gas flow field strip, respectively, effectively reducing the thickness of the anode plate. At the same time, the anode liquid distribution tank and the anode liquid flow field strip ensure the uniform distribution and effective flow of liquid on the back of the anode plate.

[0016] As a preferred embodiment of this utility model, the cathode gas guide bar includes a cathode gas flow field bar, which is disposed in the cathode gas groove, and cathode gas distribution bars are provided at both ends of the cathode gas flow field bar.

[0017] By adopting the above scheme, the design of the cathode gas flow field strip and the cathode gas distribution strip also optimizes the gas distribution in the cathode plate, improves the gas utilization rate, and enhances the overall performance of the fuel cell.

[0018] As a preferred embodiment of this utility model, the cathode liquid guiding groove includes a cathode liquid distribution groove and a cathode liquid flow field groove. The position of the cathode liquid distribution groove corresponds to the position of the cathode gas distribution strip, and the position of the cathode liquid flow field groove corresponds to the position of the cathode gas flow field strip.

[0019] By adopting the above scheme, the thickness of the cathode gas distribution strip and the cathode gas flow field strip can be fully utilized through the setting of the cathode liquid distribution tank and the cathode gas flow field strip. Corresponding channels are opened at their corresponding positions, so that the cathode liquid distribution tank and the cathode liquid flow field strip are located inside the ridge of the cathode gas distribution strip and the cathode gas flow field strip, respectively, effectively reducing the thickness of the cathode plate. At the same time, the cathode liquid distribution tank and the cathode liquid flow field strip ensure the uniform distribution and effective flow of liquid on the back of the cathode plate.

[0020] As a preferred embodiment of this utility model, the two ends of the anode gas tank are respectively provided with an anode gas inlet and an anode gas outlet.

[0021] Using the above scheme, the gas can enter the anode gas tank through the anode gas inlet, and under the guiding effect of the anode gas distribution bar and the anode gas flow field bar, it flows to the anode gas outlet to be discharged from the anode gas tank.

[0022] As a preferred embodiment of this utility model, the cathode gas tank is provided with a cathode gas inlet and a cathode gas outlet at both ends.

[0023] Using the above scheme, the gas can enter the cathode gas tank through the cathode gas inlet, and flow to the cathode gas outlet to be discharged from the cathode gas tank under the guidance of the cathode gas distribution bar and the cathode gas flow field bar.

[0024] As a preferred embodiment of this utility model, the back of the cathode plate is provided with a liquid inlet and a liquid outlet, which are respectively located at both ends of the cathode liquid tank.

[0025] Using the above scheme, the liquid can enter the cathode liquid tank through the liquid inlet. After entering the cathode liquid tank, the liquid flows to the liquid outlet under the action of the anode liquid distribution tank, the anode liquid flow field tank, the cathode liquid distribution tank, and the cathode liquid flow field tank.

[0026] The above-mentioned graphite bipolar plate structure has the following advantages: by setting the position of the anode liquid guide groove at the corresponding position of the anode gas guide strip, and setting the position of the cathode liquid guide groove at the corresponding position of the cathode gas guide strip, the anode liquid guide groove and the cathode liquid guide groove are respectively located inside the ridge of the anode gas guide strip and the ridge of the cathode gas guide strip, effectively reducing the thickness of the anode plate and the cathode plate, thereby reducing the weight of the fuel cell stack, reducing the volume of the fuel cell stack, and increasing the power density. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a graphite bipolar plate structure according to the present invention;

[0028] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0029] Figure 3 for Figure 1 A magnified view of a section at point B in the middle;

[0030] Figure 4 This is a schematic diagram of the back structure of the anode plate in a graphite bipolar plate structure according to the present invention.

[0031] Figure 5 for Figure 4 A magnified view of a section at point C;

[0032] Figure 6 This is a schematic diagram of the front structure of the cathode plate in a graphite bipolar plate structure according to the present invention.

[0033] Figure 7 for Figure 6 A magnified view of a section at point D;

[0034] Figure 8 This is a cross-sectional schematic diagram of a graphite bipolar plate structure according to the present invention.

[0035] Figure 9 for Figure 8 A magnified view of a section at point E in the middle;

[0036] In the diagram: 1. Anode plate; 2. Anode gas tank; 3. Anode gas guide bar; 31. Anode gas flow field bar; 32. Anode gas distribution bar; 4. Anode liquid guide tank; 41. Anode liquid distribution tank; 42. Anode liquid flow field tank; 5. Cathode plate; 6. Cathode gas tank; 7. Cathode liquid tank; 8. Cathode gas guide bar; 81. Cathode gas flow field bar; 82. Cathode gas distribution bar; 9. Cathode liquid guide tank; 91. Cathode liquid distribution tank; 92. Cathode liquid flow field tank; 10. Anode gas inlet; 11. Anode gas outlet; 12. Cathode gas inlet; 13. Cathode gas outlet; 14. Liquid inlet; 15. Liquid outlet.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] This utility model proposes a graphite bipolar plate structure.

[0042] Reference Figures 1 to 9In one embodiment of this utility model, a graphite bipolar plate structure includes an anode plate 1 and a cathode plate 5. An anode gas groove 2 is formed on the front side of the anode plate 1, and an anode gas guide strip 3 is disposed within the anode gas groove 2. An anode liquid guide groove 4 is disposed on the back side of the anode plate 1, with the position of the anode liquid guide groove 4 corresponding to the position of the anode gas guide strip 3. Specifically, the anode gas guide strip 3 includes an anode gas flow field strip 31, which is disposed within the anode gas groove 2. Anode gas distribution strips 32 are provided at both ends of the anode gas flow field strip 31. The anode liquid guide groove 4 includes an anode liquid distribution groove 41 and an anode liquid flow field groove 42, with the position of the anode liquid distribution groove 41 corresponding to the position of the anode gas distribution strip 32, and the position of the anode liquid flow field groove 42 corresponding to the position of the anode gas flow field strip 31. Through the arrangement of the anode gas distribution strip 32 and the anode gas flow field strip 31, the gas distribution within the anode plate 1 is optimized, the gas utilization rate is enhanced, and the performance of the fuel cell is improved. By setting up the anode liquid distribution tank 41 and the anode liquid flow field tank 42, the thickness of the anode gas distribution strip 32 and the anode gas flow field strip 31 can be fully utilized. Corresponding channels are opened at their corresponding positions, so that the anode liquid distribution tank 41 and the anode liquid flow field tank 42 are located inside the ridge of the anode gas distribution strip 32 and the anode gas flow field strip 31, respectively, effectively reducing the thickness of the anode plate 1. At the same time, the anode liquid distribution tank 41 and the anode liquid flow field tank 42 ensure the uniform distribution and effective flow of liquid on the back of the anode plate 1. A cathode gas groove 6 is formed on the front side of the cathode plate 5, and a cathode gas guide strip 8 is arranged within the cathode gas groove 6. A cathode liquid groove 7 is formed on the back side of the cathode plate 5, and a cathode liquid guide channel 9 is arranged within the cathode liquid groove 7. The position of the cathode liquid guide channel 9 corresponds to the position of the cathode gas guide strip 8. Specifically, the cathode gas guide strip 8 includes a cathode gas flow field strip 81, which is arranged within the cathode gas groove 6. Cathode gas distribution strips 82 are arranged at both ends of the cathode gas flow field strip 81. The cathode liquid guide channel 9 includes a cathode liquid distribution channel 91 and a cathode liquid flow field channel 92. The position of the cathode liquid distribution channel 91 corresponds to the position of the cathode gas distribution strip 82, and the position of the cathode liquid flow field channel 92 corresponds to the position of the cathode gas flow field strip 81. The design of the cathode gas flow field strip 81 and the cathode gas distribution strip 82 also optimizes the gas distribution within the cathode plate 5, improves the gas utilization rate, and enhances the overall performance of the fuel cell.By setting up the cathode liquid distribution groove 91 and the cathode liquid flow field groove 92, the thickness of the cathode gas distribution strip 82 and the cathode gas flow field strip 81 can be fully utilized. Corresponding channels are opened at their corresponding positions, so that the cathode liquid distribution groove 91 and the cathode liquid flow field groove 92 are located inside the ridge of the cathode gas distribution strip 82 and the cathode gas flow field strip 81, respectively, effectively reducing the thickness of the cathode plate 5. At the same time, the cathode liquid distribution groove 91 and the cathode liquid flow field groove 92 ensure uniform distribution and effective flow of liquid on the back side of the cathode plate 5. The back side of the anode plate 1 is attached to the back side of the cathode plate 5. By setting the anode liquid guide groove 4 at the position corresponding to the anode gas guide strip 3 and the cathode liquid guide groove 9 at the position corresponding to the cathode gas guide strip 8, the thickness of the guide strips can be effectively utilized, thereby effectively reducing the thickness of the anode plate 1 and the cathode plate 5, reducing the weight and volume of the fuel cell stack, and thus improving the power density.

[0043] Reference Figures 1 to 9 In one embodiment, the anode gas tank 2 is provided with an anode gas inlet 10 and an anode gas outlet 11 at both ends. Gas can enter the anode gas tank 2 through the anode gas inlet 10, and under the guidance of the anode gas distribution bar 32 and the anode gas flow field bar 31, it flows to the anode gas outlet 11 to be discharged from the anode gas tank 2. The cathode gas tank 6 is provided with a cathode gas inlet 12 and a cathode gas outlet 13 at both ends. Gas can enter the cathode gas tank 6 through the cathode gas inlet 12, and under the guidance of the cathode gas distribution bar 82 and the cathode gas flow field bar 81, it flows to the cathode gas outlet 13 to be discharged from the cathode gas tank 6. The back of the cathode plate 5 is provided with a liquid inlet 14 and a liquid outlet 15, which are respectively located at both ends of the cathode liquid tank 7. Liquid can enter the cathode liquid tank 7 through the liquid inlet 14, and after entering the cathode liquid tank 7, the liquid flows to the liquid outlet 15 under the action of the anode liquid distribution bar 41, the anode liquid flow field bar 42, the cathode liquid distribution bar 91, and the cathode liquid flow field bar 92.

[0044] By positioning the anode liquid guide channel 4 at the corresponding position of the anode gas guide bar 3, and positioning the cathode liquid guide channel 9 at the corresponding position of the cathode gas guide bar 8, the anode liquid guide channel 4 and the cathode liquid guide channel 9 are located inside the ridge of the anode gas guide bar 3 and the ridge of the cathode gas guide bar 8, respectively. This effectively reduces the thickness of the anode plate 1 and the cathode plate 5, thereby reducing the weight of the fuel cell stack, reducing the volume of the fuel cell stack, and increasing the power density.

[0045] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A graphite bipolar plate structure, characterized in that, include: An anode plate is provided with an anode gas groove on its front side, and an anode gas guide strip is provided inside the anode gas groove. An anode liquid guide groove is provided on the back side of the anode plate, and the position of the anode liquid guide groove corresponds to the position of the anode gas guide strip. A cathode plate has a cathode gas groove on its front side, and a cathode gas guide strip inside the cathode gas groove. A cathode liquid groove is provided on the back side of the cathode plate, and a cathode liquid guide groove is provided inside the cathode liquid groove. The position of the cathode liquid guide groove corresponds to the position of the cathode gas guide strip. The back side of the anode plate is attached to the back side of the cathode plate. The anode gas guide bar includes an anode gas flow field bar, which is disposed in the anode gas tank, and anode gas distribution bars are provided at both ends of the anode gas flow field bar; The anolyte flow channel includes an anolyte distribution channel and an anolyte flow field channel. The position of the anolyte distribution channel corresponds to the position of the anolyte gas distribution strip, and the position of the anolyte flow field channel corresponds to the position of the anolyte gas flow field strip.

2. The graphite bipolar plate structure according to claim 1, characterized in that: The cathode gas guide bar includes a cathode gas flow field bar, which is disposed in the cathode gas groove, and cathode gas distribution bars are provided at both ends of the cathode gas flow field bar.

3. The graphite bipolar plate structure according to claim 2, characterized in that: The cathode liquid guide channel includes a cathode liquid distribution channel and a cathode liquid flow field channel. The position of the cathode liquid distribution channel corresponds to the position of the cathode gas distribution strip, and the position of the cathode liquid flow field channel corresponds to the position of the cathode gas flow field strip.

4. The graphite bipolar plate structure according to claim 1, characterized in that: The anode gas tank is provided with an anode gas inlet and an anode gas outlet at both ends.

5. The graphite bipolar plate structure according to claim 1, characterized in that: The cathode gas tank is provided with a cathode gas inlet and a cathode gas outlet at both ends.

6. The graphite bipolar plate structure according to claim 1, characterized in that: The back of the cathode plate is provided with a liquid inlet and a liquid outlet, which are respectively located at both ends of the cathode liquid tank.

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