Fuel cell polar plate assembly and cathode plate and anode plate

Abstract

The invention relates to a fuel cell plate assembly and a cathode plate and an anode plate, the plate assembly comprising a cathode plate and an anode plate, wherein the cathode plate comprises a cathode flow field part, which comprises a first guide part with a plurality of first guide ridges in the form of interrupted strips and a first main flow field part, and the anode flow field part comprises a second guide part with a plurality of second guide ridges in the form of interrupted strips and a second main flow field part, wherein the first and second guide ridges have a high degree of correspondence between their extension and the flow direction of the fluid, so that the amount of liquid water that is generated and accumulates as a result of the impact of gaseous water carried by the fluid on the guide ridges is minimized, and water flooding is prevented, and the interrupted configuration of the guide ridges enables the gas to be alternately divided and combined during the guiding, so that the fluid is distributed more evenly during multiple redistribution and recombination.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel cells, and in particular, the present application relates to a kind of polar plate assembly capable of uniform flow guide and corresponding cathode plate and anode plate. BACKGROUND

[0002] Fuel cell is a kind of power generation device that converts chemical energy in fuel (hydrogen) and oxidant (oxygen) into electrical energy through electrochemical reaction. Because it is not limited by "Carnot cycle", the energy conversion efficiency is significantly higher than ordinary heat engine. In addition, fuel cell also has the advantages of no pollution, low noise, high reliability, etc.

[0003] Fuel cell includes a plurality of mutually stacked fuel cell monomers, wherein the fuel cell monomers include a cathode plate, an anode plate and a membrane electrode assembly sandwiched between the cathode plate and the anode plate, the cathode plate is used to uniformly distribute and guide the oxidant (oxygen or oxygen-containing gas) to the cathode side of the membrane electrode assembly, and the anode plate is used to uniformly distribute and guide the fuel (hydrogen) to the anode side of the membrane electrode assembly, thereby supplying fuel and oxidant for the electrochemical reaction of the fuel cell.

[0004] In order to ensure the normal reaction of the fuel cell and enhance its performance, the oxidant should be uniformly distributed and guided from its inlet to the cathode reaction flow field, and correspondingly, the fuel should be uniformly distributed and guided from its inlet to the anode reaction flow field. In other words, the uniformity of the distribution of oxidant and fuel in the corresponding reaction flow field directly affects the performance of the fuel cell.

[0005] As shown in Figure 1 and Figure 2 , the gas inlet and outlet of the polar plate (cathode plate or anode plate) and the main flow field are shown in the drawings. In Figure 1 , the flow guide structure adopts a dot matrix arrangement of flow guide columns, and the gas is guided by the dot matrix flow guide columns, so as to distribute and guide the gas from the inlet to each flow channel of the main flow field. However, this dot matrix arrangement of flow guide columns does not conform to the gas flow rule, and the matching degree with the gas flow path is poor, so that liquid water is easily generated and accumulated near the flow guide columns, thereby causing waterlogging.

[0006] In Figure 2 , the flow guide structure adopts a continuous flow guide ridge, and the gas is guided to different flow channels of the main flow field by different flow guide ridges after flowing out of the inlet, thereby realizing the guidance and distribution of the gas. Since the gas is difficult to uniformly flow into different flow guide channels (channels formed between adjacent flow guide ridges) from the inlet, the gas flow in each flow guide channel is not equal, thereby causing the gas to be difficult to be uniformly distributed and guided to each flow channel of the main flow field. SUMMARY

[0007] One advantage of the present application is to provide a fuel cell's polar plate assembly and cathode plate and anode plate, wherein the cathode plate and the anode plate of the polar plate assembly are both provided with discontinuous flow guide ridges, wherein the flow guide ridges extend along the flow path of the fluid, and since the extension direction of the flow guide ridges matches the flow direction of the fluid to a higher degree, the liquid water generated and accumulated due to the impact of the gaseous water carried by the gas on the flow guide ridges can be minimized, and water flooding can be prevented.

[0008] Another advantage of the present application is to provide a fuel cell's polar plate assembly and cathode plate and anode plate, wherein the discontinuous configuration of the flow guide ridges can make the gas alternately diverge and converge during the guiding process, so that the gas can be distributed more evenly during multiple redistribution and re-converging processes.

[0009] Another advantage of the present application is to provide a fuel cell's polar plate assembly and cathode plate and anode plate, wherein when the cathode plate and the anode plate are aligned and stacked with the cathode flow field part facing the anode flow field part, part of the flow guide ridges provided on the cathode plate and part of the flow guide ridges provided on the anode plate are mirror-distributed, so that when a membrane electrode assembly is clamped between the cathode plate and the anode plate, the mirror-distributed part of the flow guide ridges can provide good support to the membrane electrode assembly, so that the membrane electrode assembly can be kept flat under the pressure of both sides, and the membrane electrode assembly can be prevented from being warped or even damaged due to the misalignment of the flow guide ridges on both sides.

[0010] Another advantage of the present application is to provide a fuel cell's polar plate assembly and cathode plate and anode plate, wherein when the membrane electrode assembly is clamped between the cathode plate and the anode plate, any flow guide ridge of the cathode plate at least partially overlaps at least one flow guide ridge of the anode plate, so that the membrane electrode assembly can be supported flat between the cathode plate and the anode plate.

[0011] In order to achieve at least one of the above-mentioned advantages, the present application provides a fuel cell's polar plate assembly, which comprises a cathode plate and an anode plate, wherein the cathode plate comprises a cathode flow field part, the cathode flow field part comprises at least a first guide part and a first main flow field part, the first guide part comprises a plurality of discontinuous strip-shaped first flow guide ridges for guiding the fluid flowing through the first guide part; the anode plate comprises an anode flow field part, the anode flow field part comprises at least a second guide part and a second main flow field part, the second guide part comprises a plurality of discontinuous strip-shaped second flow guide ridges for guiding the fluid flowing through the second guide part.

[0012] In some embodiments, the cathode plate comprises two of the first guide portions and the first main flow field portion located between the two first guide portions, wherein the two first guide portions are centrally symmetric about a center point of the cathode flow field portion, and the anode plate comprises two of the second guide portions and the second main flow field portion located between the two second guide portions, wherein the two second guide portions are centrally symmetric about a center point of the anode flow field portion.

[0013] In some embodiments, when the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion, part of the first flow guide ridges and part of the second flow guide ridges are mirror symmetric.

[0014] In some embodiments, the first flow guide ridges and the second flow guide ridges respectively extend along the corresponding fluid flow paths obtained by simulation.

[0015] In some embodiments, the depth of the first guide portion is greater than the depth of the first main flow field portion.

[0016] In some embodiments, the depth of the second guide portion is greater than the depth of the second main flow field portion.

[0017] In some embodiments, when the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion, part of the first flow guide ridges are arranged such that the first flow guide ridges are arranged in intersection with at least two of the second flow guide ridges to form at least two first intersection positions, so that the first flow guide ridges are supported by at least two of the second flow guide ridges at the at least two first intersection positions.

[0018] In some embodiments, when the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion, part of the second flow guide ridges are arranged such that the second flow guide ridges are arranged in intersection with at least two of the first flow guide ridges to form at least two second intersection positions, so that the second flow guide ridges are supported by at least two of the first flow guide ridges at the at least two second intersection positions.

[0019] The present application also provides a cathode plate of a fuel cell, wherein the cathode plate comprises a cathode flow field portion, and the cathode flow field portion comprises at least a first guide portion and a first main flow field portion, the first guide portion comprises a plurality of discontinuous strip-shaped first flow guide ridges for guiding fluid flowing through the first guide portion.

[0020] The present application also provides an anode plate of a fuel cell, wherein the anode plate comprises an anode plate flow field portion, wherein the anode flow field portion comprises at least a second guide portion and a second main flow field portion, the second guide portion comprises a plurality of discontinuous strip-shaped second flow guide ridges for guiding fluid flowing through the second guide portion. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Fig. 1 is a schematic view of a prior art anode plate showing a dot-matrix arrangement of flow guide posts.

[0022] Figure 2 Fig. 2 is a schematic view of another prior art anode plate showing a continuous flow guide ridge.

[0023] Figure 3 Fig. 3 is a schematic view of a cathode plate of an anode plate assembly according to an embodiment of the present application.

[0024] Figure 4 Fig. 4 is a schematic view of an anode plate of the anode plate assembly according to the above embodiment of the present application.

[0025] Figure 5 Fig. 5 is a schematic view of the cathode plate and the anode plate of the anode plate assembly according to the above embodiment of the present application.

[0026] Figure 6 Fig. 6 shows that when the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion, part of the first flow guide ridges and part of the second flow guide ridges are mirror-symmetric, wherein the flow guide ridges shown in dashed lines are the first flow guide ridges, and the flow guide ridges shown in solid lines are the second flow guide ridges, in order to facilitate the display of the structure of the flow guide ridges, the cathode plate and the anode plate in the figure hide the details irrelevant to the present application, and are only schematic cathode plate and anode plate.

[0027] Figure 7 is Figure 6 Fig. 7 is a schematic view of a partial enlargement of A in Fig. 6.

[0028] Figure 8 Figure 6 Fig. 8 is a schematic view of a partial enlargement of B in Fig. 6. DETAILED DESCRIPTION

[0029] The following description is presented to enable any person skilled in the art to practice the present application as claimed. The preferred embodiments disclosed herein are only examples of the present application and alternative embodiments will be apparent to those skilled in the art upon reading the present disclosure. The present application is directed to what is currently considered to be the most practical and preferred embodiments of the application, and the scope of the present application is defined by the appended claims.

[0030] It is to be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like as used herein with reference to the orientation or position of the illustrated device or element are based on the orientation or position of the device or element as shown in the drawings, which are for purposes of convenience and for simplicity of description and are not intended to indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed or interpreted as limiting the application.

[0031] It is to be understood that the term "one" is to be understood as "at least one" or "one or more" such that a quantity of elements may, in one embodiment, be one, and may, in another embodiment, be more than one. The term "one" is not to be construed as limiting the quantity to one.

[0032] As shown in Figures 3 to 8 The present application provides a polar plate assembly 10, wherein the polar plate assembly 10 comprises a cathode plate 11 and an anode plate 12, wherein the cathode plate 11 comprises two cathode plate ends 111 and a cathode flow field portion 112 extending between the two cathode plate ends 111, and the anode plate 12 comprises two anode plate ends 121 and an anode flow field portion 122 extending between the two anode plate ends 121, wherein the cathode plate ends 111 and the anode plate ends 121 are configured to provide respective passages for supply or discharge of fuel, oxidant and coolant. It is to be understood that the fuel is hydrogen or a hydrogen-containing gas, and the oxidant is oxygen or an oxygen-containing gas, preferably air.

[0033] As shown in Figure 3 and Figure 4As shown, the cathode flow field part 112 comprises two first guide parts 1121 and a first main flow field part 1122 arranged between the two first guide parts 1121, one of the first guide parts 1121 is used to guide the newly supplied oxidant to the first main flow field part 1122, and the other first guide part 1121 guides the reacted gas or liquid flowing out of the first main flow field part 1122 to discharge the cathode flow field part 112, wherein preferably, the two first guide parts 1121 are centrally symmetric about the center point of the cathode flow field part 112, and correspondingly, the anode flow field part 122 comprises two second guide parts 1221 and a second main flow field part 1222 arranged between the two second guide parts 1221, one of the second guide parts 1221 is used to guide the newly supplied fuel to the second main flow field part 1222, and the other second guide part 1221 guides the reacted gas or liquid flowing out of the second main flow field part 1222 to discharge the anode flow field part 122, wherein preferably, the two second guide parts 1221 are centrally symmetric about the center point of the anode flow field part 122.

[0034] Further, in this embodiment of the present application, a plurality of first flow guide ridges 11211 are arranged in each of the two first guide parts 1121, the first flow guide ridges 11211 protrude from the flow guide surface of the first guide part 1121, one of the first guide parts 1121 is used to guide the newly supplied oxidant to the first main flow field part 1122 through the first flow guide ridges 11211, and the first flow guide ridges 11211 of the other first guide part 1121 are used to guide the reacted gas or liquid flowing out of the first main flow field part 1122 to discharge the cathode flow field part 112.

[0035] In detail, the first flow guide ridges 11211 in the first guide part 1121 are obtained by simulation, the extension direction of the simulated first flow guide ridges 11211 conforms to the fluid flow rule, so the matching degree with the real fluid flow path is high, so that when the fluid flows along the flow guide path formed by the first flow guide ridges 11211, the liquid water generated and accumulated due to the impact of gaseous water carried in the gas on the first flow guide ridges 11211 can be minimized, and waterlogging is prevented.

[0036] As Figure 3As shown, the first guide ridges 11211 described in each of the present invention are configured as discontinuous strip structures. Thus, when a first guide portion 1121 is used to guide a newly supplied oxidant to the first mainstream field portion 1122, its discontinuous strip arrangement structure allows the gas on both sides of the first guide ridge 11211 to be redistributed and recombined at the discontinuity during the flow to the first mainstream field portion 1122, thereby enabling the oxidant to be more evenly distributed to the first mainstream field portion 1122 through redistribution and recombination.

[0037] It is worth emphasizing that the depth of both first guide sections 1121 is greater than the depth of the first main flow field section 1122, thereby reducing the flow resistance of gas in the two first guide sections 1121. The depth of the first guide section 1121 refers to the depth of its guiding surface, and the depth of the first main flow field section 1122 refers to the depth of the flow channel formed within it. Therefore, when gas flows from one first guide section 1121 to the first main flow field section 1122, it is equivalent to flowing from a region with greater depth to a region with less depth, requiring a certain height to rise. The gas diverted by the first guide ridge 11211 will be further uniformly converged due to the step-like structure formed by the height difference, and then uniformly flow into each flow channel within the first main flow field section 1122. Preferably, the two first guide sections 1121 have the same depth.

[0038] like Figure 3 As shown, each of the first guide sections 1121 is provided with a first flow port 11210. One first flow port 11210 is used to supply oxidant to the corresponding first guide section 1121, and the other first flow port 11210 is used to discharge the reacted gas or liquid from the other first guide section 1121. Specifically, the oxidant supplied from the oxidant inlet of the cathode plate end 111 on one side of the cathode plate 11 can flow into the corresponding first guide section 1121 through one first flow port 1121, and then be uniformly guided by the first guide section 1121 to the first mainstream field section 1122, thereby participating in the electrochemical reaction. The reacted gas (such as unreacted oxidant and its carried gaseous water) or liquid (such as the water generated by the reaction) can be guided by the other first guide section 1121 to the other first flow port 11210, so that the reacted gas or liquid can flow into the oxidant outlet of the cathode plate end 111 on the other side of the cathode plate 11.

[0039] Correspondingly, a plurality of second flow guide ridges 12211 are arranged in each of the two second guide portions 1221, the second flow guide ridges 12211 are protruded from the flow guide surface of the second guide portion 1221, one of the second guide portions 1221 is used to guide the newly supplied fuel to the second main flow field portion 1222 through the second flow guide ridges 12211, and the other of the second guide portions 1221 is used to guide the reacted gas or liquid flowing out of the second main flow field portion 1222 to flow out of the anode flow field portion 122.

[0040] The second flow guide ridges 12211 in the second guide portion 1221 are obtained through simulation and conform to the fluid flow law, so that the matching degree with the actual fluid flow path is high, so that when the fluid flows along the flow guide path formed by the second flow guide ridges 12211, the liquid water generated and accumulated due to the impact of gaseous water carried in the gas on the second flow guide ridges 12211 can be minimized, and waterlogging is prevented.

[0041] As shown in Figure 4 The second flow guide ridges 12211 are arranged in an intermittent strip structure, and when one of the second guide portions 1221 is used to guide the newly supplied fuel to the second main flow field portion 1222, the intermittent strip arrangement structure can make the gas on both sides of the second flow guide ridges 12211 be redistributed and recombined at the intermittent positions during the flow to the second main flow field portion 1222, so that the fuel can be more uniformly distributed to the second main flow field portion 1222 through redistribution and recombination.

[0042] Similarly, the depths of the two second guide portions 1221 are greater than the depth of the second main flow field portion 1222, so as to reduce the flow resistance of the gas in the two second guide portions 1221, wherein the depth of the second guide portion 1221 refers to the depth of the flow guide surface of the second guide portion 1221, and the depth of the second main flow field portion 1222 refers to the depth of the flow channel formed in the second main flow field portion 1222. Therefore, when the gas flows from one second guide portion 1221 to the second main flow field portion 1222, it is equivalent to flowing from an area with a large depth to an area with a small depth, and the gas branched by the second flow guide ridges 12211 is further uniformly converged due to the blocking of the stepped structure formed by the height difference, and then uniformly flows into each flow channel in the second main flow field portion 1222. Preferably, the depths of the two second guide portions 1221 are the same.

[0043] As shown in Figure 4As shown, each of the second guiding portions 1221 is provided with a second flow-through port 12210, one of which is used to supply fuel to the corresponding second guiding portion 1221, and the other of which is used to guide the reacted gas or liquid out of the other second guiding portion 1221. Specifically, the fuel supplied from the fuel inlet of the anode plate end 121 of the anode plate 12 can flow into the corresponding second guiding portion 1221 through one second flow-through port 12210, and then be uniformly guided by the second guiding portion 1221 to the second main flow field portion 1222, so as to participate in the electrochemical reaction, and the reacted gas (such as unreacted fuel and gaseous water carried thereby) or liquid (such as water permeated from the other side of the membrane electrode assembly) can be guided by the other second guiding portion 1221 to the other second flow-through port 12210, so as to flow into the fuel outlet of the anode plate end 121 of the anode plate 12 on the other side.

[0044] Since the first flow-through port 11210 is formed in the first guiding portion 1121 near the oxidant inlet or oxidant outlet of the cathode plate 11, and the second flow-through port 12210 is formed in the second guiding portion 1221 near the fuel inlet or fuel outlet of the anode plate 12, when the membrane electrode assembly is clamped between the cathode plate 11 and the anode plate 12, i.e., the cathode plate 11, the anode plate 12 and the membrane electrode assembly are assembled into a fuel cell single unit, the first flow-through port 11210 and the second flow-through port 12210 cannot face each other, and the first flow-through port 11210 and the second flow-through port 12210 respectively face different regions of the membrane electrode assembly. It can be understood that the arrangement position of the first flow-through port 11210 directly affects the flow path of the fluid in the first guiding portion 1121, and correspondingly, the arrangement position of the second flow-through port 12210 directly affects the flow path of the fluid in the second guiding portion 1221. Obviously, the flow path of the fluid in the first guiding portion 1121 is different from the flow path of the fluid in the second guiding portion 1221. In order to enable the first flow guide ridge 11211 and the second flow guide ridge 12211 to match the corresponding flow paths respectively, the first flow guide ridge 11211 in the first guiding portion 1121 cannot be completely mirror-symmetrical to the second flow guide ridge 12211 in the second guiding portion 1221, and the arrangement manner of the flow guide ridges closer to the first flow-through port 11210 and the second flow-through port 12210 is more different.

[0045] The person skilled in the art can understand that, when considering fluid flow, the higher the matching degree of the flow guide ridge and the flow path of the fluid, the more uniform the gas distribution, and the less likely water flooding occurs; when considering the support of the membrane electrode assembly by the flow guide ridge, the higher the symmetry of the arrangement mode of the flow guide ridges on both sides of the membrane electrode assembly, the more flatly the membrane electrode assembly can be supported, and the less likely the membrane electrode assembly is warped and deformed; however, the two are contradictory and cannot be perfectly balanced at the same time, if the matching degree of the flow guide ridge and the flow path of the fluid is higher, the symmetry of the arrangement mode of the flow guide ridges on both sides of the membrane electrode assembly is lower, and vice versa, if the symmetry of the arrangement mode of the flow guide ridges on both sides of the membrane electrode assembly is higher, the matching degree of the flow guide ridge and the flow path of the fluid is lower; at present, the contradictory problem of the above two has not been highlighted in the design of the existing continuous flow guide ridge, because when the flow guide ridges on both sides of the membrane electrode assembly are continuous flow guide ridges, the mutual crossing area of the flow guide ridges on both sides can provide support to both sides of the membrane electrode assembly at the same time; however, for the intermittent flow guide ridge, the flow guide ridges on both sides are likely to have the situation that the intermittent area on one side is directly opposite the solid area on the other side, thereby causing some areas of the membrane electrode assembly to be supported by the flow guide ridge on only one side, and the corresponding other side lacks the support of the flow guide ridge, and the present application proposes a technical solution to balance the contradiction of the above two for the intermittent flow guide ridge, which ensures that the flow guide ridge and the flow path of the fluid have a high matching degree, at the same time, enhances the symmetry of the flow guide ridge of the cathode plate and the flow guide ridge of the anode plate about the membrane electrode assembly, so that the membrane electrode assembly can be flatly supported by the flow guide ridges on both sides, which is also the particularly valuable place of the present application.

[0046] As Figure 5 and Figure 6As shown, in the embodiment of the present application, the first guiding part 1121 has a first region 11212, wherein the first region 11212 is formed at one end of the first guiding part 1121 and is spaced apart from the first flow-through port 11210. Correspondingly, the second guiding part 1221 has a second region 12212, wherein the second region 12212 is formed at one end of the second guiding part 1221 away from the second flow-through port 12210, in other words, the second region 12212 and the second flow-through port 12210 are respectively formed at opposite ends of the second guiding part 1221. Further, the first region 11212 and the second region 12212 are respectively formed in mirror image in the first guiding part 1121 and the second guiding part 1221, wherein, when the membrane electrode assembly is clamped between the cathode plate 11 and the anode plate 12, the first region 11212 and the second region 12212 are opposite to each other and are mirror-symmetric about the membrane electrode assembly, at this time, the orthographic projection of the first region 11212 in the plane of the membrane electrode assembly and the orthographic projection of the second region 12212 in the plane of the membrane electrode assembly coincide with each other. Specifically, the first flow guide ridge 11211 formed in the first region 11212 and the second flow guide ridge 12211 formed in the second region 12212 respectively correspond one-to-one and are mirror-symmetric, wherein the corresponding first flow guide ridge 11211 and the second flow guide ridge 12211 have the same size, shape and extension direction, so that when the membrane electrode assembly is clamped between the cathode plate 11 and the anode plate 12, the first flow guide ridge 11211 in the first region 11212 and the second flow guide ridge 12211 in the second region 12212 can respectively support each other on both sides of the membrane electrode assembly, thereby providing stable support to the membrane electrode assembly, so that the membrane electrode assembly remains flat under the pressure of both sides, preventing the membrane electrode assembly from warping or even breaking due to the misalignment of the flow guide ridges on both sides.

[0047] At the same time, the first flow guide ridge 11211 in the first region 11212 of the cathode plate 11 and the second flow guide ridge 12211 in the second region 12212 of the anode plate 12 are arranged in mirror image, which can also make the cathode plate 11 and the anode plate 12 more uniform in stress during the pressing process of assembling the fuel cell stack, especially the first region 11212 of the cathode plate 11 and the second region 12212 of the anode plate 12, which significantly enhances the mechanical properties of the cathode plate 11 and the anode plate 12, preventing the first guiding part 1121 and the second guiding part 1221 from breaking due to excessive uneven stress.

[0048] Furthermore, in the embodiment of the present application, the first guiding portion 1121 of the cathode plate 11 further has a third region 11213 defined as the remaining part of the first guiding portion 1121 except the first region 11212, in other words, the first guiding portion 1121 is composed of the first region 11212 and the third region 11213, wherein the first flow-through port 11210 is formed in the third region 11213.

[0049] Correspondingly, the second guiding portion 1221 of the anode plate 12 further has a fourth region 12213 defined as the remaining part of the second guiding portion 1221 except the second region 12212. That is, the second guiding portion 1221 is composed of the second region 12212 and the fourth region 12213, wherein the second flow-through port 12210 is formed in the fourth region 12213.

[0050] As mentioned above, the first region 11212 in the first guiding portion 1121 and the second region 12212 in the second guiding portion 1221 are mirror-imaged to each other, and the first flow guide ridge 11211 in the first region 11212 and the second flow guide ridge 12211 in the second region 12212 are mirror-imaged to each other, so that when the membrane electrode assembly is clamped between the anode plate 12 and the cathode plate 11, the first region 11212 and the second region 12212 are opposite to each other on both sides of the membrane electrode assembly, and the first flow guide ridge 11211 in the first region 11212 and the second flow guide ridge 12211 in the second region 12212 are opposite to each other on both sides of the membrane electrode assembly, respectively.

[0051] Meanwhile, since the first flow-through port 11210 and the second flow-through port 12210 are respectively arranged in the third region 11213 and the fourth region 12213, and the positions of the first flow-through port 11210 and the second flow-through port 12210 are not opposite to each other, in order to achieve better flow guide effect of the flow guide ridges, the first flow guide ridge 11211 in the third region 11213 of the first guiding portion 1121 and the second flow guide ridge 12211 in the fourth region 12213 of the second guiding portion 1221 are respectively arranged according to corresponding fluid flow paths, wherein the fluid flow paths can be obtained by simulation. It can be understood that the first flow guide ridge 11211 in the third region 11213 and the second flow guide ridge 12211 in the fourth region 12213 are not mirror-imaged to each other.

[0052] Preferably, as Figure 6As shown, in this embodiment of the invention, in order to improve the support effect on the membrane electrode assembly and enhance the mechanical properties of the cathode plate 11 and the anode plate 12, when the membrane electrode assembly is clamped between the cathode plate 11 and the anode plate 12, any first flow guide ridge 11211 in the third region 11213 of the first guide portion 1121 of the cathode plate 11 can at least partially overlap with at least one second flow guide ridge 12211 in the fourth region 12213 of the second guide portion 1221 of the anode plate 12, thereby providing support on both sides of the same region of the membrane electrode assembly. Similarly, any second flow guide ridge 12211 in the fourth region 12213 is configured to at least partially overlap with at least one first flow guide ridge 11211 in the third region 11213, thereby providing support on both sides of the same region of the membrane electrode assembly. Thus, the membrane electrode assembly can be supported flatly on both sides by the flow guide ridges.

[0053] Furthermore, such as Figure 7 As shown, in order to enable the membrane electrode assembly to be flatly supported on both sides by the flow guide ridges, when the cathode plate 11 and the anode plate 12 are aligned and stacked with the cathode flow field portion 112 facing the anode flow field portion 122, a portion of the first flow guide ridges 11211 are arranged such that the first flow guide ridge 11211 intersects with at least two second flow guide ridges at a 12211-like arrangement to form at least two first intersection positions 11214, so that the first flow guide ridge 11211 is supported by at least two second flow guide ridges 12211 at the at least two first intersection positions 11214. Thus, in the area where such a portion of the first flow guide ridge 11211 is located, the area corresponding to the membrane electrode assembly is supported on both opposite sides, so as to avoid the membrane electrode assembly being supported by the flow guide ridge on only one side, while the corresponding other side lacks the support of the flow guide ridge.

[0054] like Figure 8 As shown, when the cathode plate 11 and the anode plate 12 are aligned and stacked with the cathode flow field portion 112 facing the anode flow field portion 122, a portion of the second guide ridge 12211 is arranged such that the second guide ridge 12211 intersects with at least two of the first guide ridges 11211 to form at least two second intersection positions 12214, so that the second guide ridge 12211 is supported by at least two of the first guide ridges 11211 at the at least two second intersection positions 12214. Thus, in the area where such a portion of the second guide ridge 12211 is located, the area corresponding to the membrane electrode assembly is supported on opposite sides, so as to avoid the membrane electrode assembly being supported by guide ridges on only one side, while the corresponding other side lacks guide ridge support.

[0055] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means 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. Also, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the person 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 contradicting each other.

[0056] The person skilled in the art will understand that the embodiments of the present application shown in the above description and the accompanying drawings are only as examples and do not limit the present application. The purpose of the present application has been completely and effectively achieved. The function and structural principle of the present application has been shown and described in the embodiments, and the embodiments of the present application can be any modification or modification without departing from the described principle.

Claims

1. A polar plate assembly for a fuel cell, characterized by The polar plate assembly comprises a cathode plate and an anode plate, wherein the cathode plate comprises a cathode flow field part, the cathode flow field part comprises at least a first guide part and a first main flow field part, the first guide part has a first flow passage, the first guide part comprises a plurality of discontinuous strip-shaped first flow guide ridges for guiding fluid flowing through the first guide part; the anode plate comprises an anode flow field part, the anode flow field part comprises at least a second guide part and a second main flow field part, the second guide part has a second flow passage, the second guide part comprises a plurality of discontinuous strip-shaped second flow guide ridges for guiding fluid flowing through the second guide part; When the cathode plate and the anode plate are aligned and stacked in a manner that the cathode flow field part faces the anode flow field part, the first flow passage and the second flow passage are not directly opposite, and part of the first flow guide ridges are arranged in such a manner that the first flow guide ridges are arranged in an intersecting manner with at least two second flow guide ridges to form at least two first intersection positions, so that the first flow guide ridges are supported by at least two second flow guide ridges at the at least two first intersection positions; or part of the second flow guide ridges are arranged in such a manner that the second flow guide ridges intersect with at least two first flow guide ridges to form at least two second intersection positions, so that the second flow guide ridges are supported by at least two first flow guide ridges at the at least two second intersection positions; The first guide part has a first region and a third region, wherein the first region is formed at one end of the first guide part, and the first region is separated from the first flow passage; The third region is defined as the remaining part of the first guide part other than the first region; The second guide part has a second region and a fourth region, wherein the second region is formed at one end of the second guide part away from the second flow passage; the fourth region is defined as the remaining part of the second guide part other than the second region; the first flow passage and the second flow passage are respectively arranged in the third region and the fourth region; When the cathode plate and the anode plate are aligned and stacked in a manner that the cathode flow field part faces the anode flow field part, the first flow guide ridges formed in the first region and the second flow guide ridges formed in the second region correspond to each other one by one and are mirror-symmetric to each other, and the first flow guide ridges in the third region and the second flow guide ridges in the fourth region are not mirror-symmetrically arranged.

2. The fuel cell's polar plate assembly of claim 1, wherein, The cathode plate comprises two first guide parts and the first main flow field part located between the two first guide parts, wherein the two first guide parts are centrally symmetric about a center point of the cathode flow field part, and the anode plate comprises two second guide parts and the second main flow field part located between the two second guide parts, wherein the two second guide parts are centrally symmetric about a center point of the anode flow field part.

3. A fuel cell polar plate assembly as claimed in claim 1 or 2, characterised in that, The depth of the first guide part is greater than the depth of the first main flow field part, and the depth of the second guide part is greater than the depth of the second main flow field part.

4. The fuel cell's polar plate assembly according to claim 1 or 2, characterized in that, The first and second flow guide ridges respectively extend along corresponding fluid flow paths obtained by simulation.

5. A polar plate assembly for a fuel cell, characterized by The polar plate assembly comprises a cathode plate and an anode plate, wherein the cathode plate comprises a cathode flow field part, the cathode flow field part comprises two first guide parts and a first main flow field part between the two first guide parts, the first guide part has a first flow passage, the first guide part comprises a plurality of intermittent strip-shaped first flow guide ridges, the first flow guide ridges protrude from the flow guide surface of the first guide part for guiding fluid flowing through the first guide part; One of the first guide parts is used to enable newly supplied oxidant to be introduced into the first main flow field part through the first flow guide ridges, and the first flow guide ridges of the other first guide part are used to guide the reacted gas or liquid flowing out of the first main flow field part to flow out of the cathode flow field part; the anode plate comprises an anode flow field part, the anode flow field part comprises at least one second guide part and a second main flow field part, the second guide part has a second flow passage, the second guide part comprises a plurality of intermittent strip-shaped second flow guide ridges for guiding fluid flowing through the second guide part; When the cathode plate and the anode plate are aligned and stacked with the cathode flow field part facing the anode flow field part, the first flow passage and the second flow passage are not directly opposite each other, and part of the first flow guide ridges are arranged in such a way that the first flow guide ridges are arranged in an intersecting manner with at least two second flow guide ridges to form at least two first intersection positions, so that the first flow guide ridges are supported by at least two second flow guide ridges at the at least two first intersection positions; or part of the second flow guide ridges are arranged in such a way that the second flow guide ridges intersect with at least two first flow guide ridges to form at least two second intersection positions, so that the second flow guide ridges are supported by at least two first flow guide ridges at the at least two second intersection positions; The first guide part has a first region and a third region, wherein the first region is formed at one end of the first guide part, and the first region is spaced apart from the first flow passage; The third region is defined as the remaining part of the first guide part other than the first region; The second guide part has a second region and a fourth region, wherein the second region is formed at one end of the second guide part away from the second flow passage; the fourth region is defined as the remaining part of the second guide part other than the second region; the first flow passage and the second flow passage are respectively arranged in the third region and the fourth region; When the cathode plate and the anode plate are aligned and stacked with the cathode flow field part facing the anode flow field part, the first flow guide ridges formed in the first region and the second flow guide ridges formed in the second region respectively correspond to each other and are mirror-symmetric to each other, and the first flow guide ridges in the third region and the second flow guide ridges in the fourth region are not mirror-symmetrically arranged.

6. The fuel cell's polar plate assembly of claim 5, wherein, The first guide ridges extend along the corresponding fluid flow paths obtained by simulation.

7. A fuel cell polar plate assembly as claimed in claim 5 or 6, characterised in that, The first guide portion has a depth greater than that of the first main flow field portion.

8. A fuel cell polar plate assembly, characterized by: The polar plate assembly comprises a cathode plate and an anode plate, wherein the cathode plate comprises a cathode flow field portion, the cathode flow field portion comprises at least a first guide portion and a first main flow field portion, the first guide portion has a first flow passage, the first guide portion comprises a plurality of discontinuous strip-shaped first guide ridges for guiding fluid flowing through the first guide portion; the anode plate comprises an anode flow field portion, the anode flow field portion comprises two second guide portions and a second main flow field portion between the two second guide portions, the second guide portion has a second flow passage, the second guide portion comprises a plurality of discontinuous strip-shaped second guide ridges, the second guide ridges protrude from the flow guiding surface of the second guide portion for guiding fluid flowing through the second guide portion; One of the second guide portions is used to guide newly supplied fuel to the second main flow field portion through the second guide ridges, and the other second guide portion is used to guide the reacted gas or liquid flowing out of the second main flow field portion out of the anode flow field portion; when the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion, the first flow passage and the second flow passage are not directly opposite each other, and part of the first guide ridges are arranged in such a way that the first guide ridges are arranged in an intersecting manner with at least two second guide ridges to form at least two first intersection positions, so that the first guide ridges are supported by at least two second guide ridges at the at least two first intersection positions; or part of the second guide ridges are arranged in such a way that the second guide ridges intersect with at least two first guide ridges to form at least two second intersection positions, so that the second guide ridges are supported by at least two first guide ridges at the at least two second intersection positions. The first guide portion has a first region and a third region, wherein the first region is formed at one end of the first guide portion, and the first region is spaced apart from the first flow passage; The third region is defined as the remaining part of the first guide portion other than the first region; The second guide portion has a second region and a fourth region, wherein the second region is formed at one end of the second guide portion away from the second flow passage; the fourth region is defined as the remaining part of the second guide portion other than the second region; the first flow passage and the second flow passage are respectively arranged in the third region and the fourth region; When the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion, the first guide ridges formed in the first region and the second guide ridges formed in the second region correspond to each other one by one and are mirror-symmetric to each other, and the first guide ridges in the third region and the second guide ridges in the fourth region are not mirror-symmetrically arranged.

9. The fuel cell's polar plate assembly of claim 8, wherein, The second flow guide ridge extends along a corresponding fluid flow path obtained by simulation.

10. A fuel cell polar plate assembly as claimed in claim 8 or 9, wherein, The depth of the second guide portion is greater than the depth of the second main flow field portion.

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