A fuel cell stack and a fuel cell stack module unit

Abstract

The application discloses a fuel cell core module unit, which comprises a cathode plate, an anode plate, a membrane electrode, a gas sealing plate and a water sealing plate; the inner side surface of the cathode plate is provided with an oxidizing gas flow channel, and the path of the oxidizing gas flow channel is designed with a shunt structure and at least two obtuse bending corners; the inner side surface of the anode plate is provided with a fuel gas flow channel, and the path of the fuel gas flow channel is designed with a shunt structure and at least one obtuse bending corner; the oxidizing gas flow channel and the fuel gas flow channel are completely staggered; the oxidizing gas flow channel and the fuel gas flow channel are sealed by the gas sealing plate; after the cathode plate and the anode plate are adhered, the cooling liquid flow channel formed between the two is sealed by the water sealing plate. The application can improve the consistency of the oxidizing gas flow rate on the whole cathode plate, so that the reaction is more uniform.

Description

Technical Field

[0001] This invention belongs to the field of fuel cell technology, specifically relating to a fuel cell cell module unit and a fuel cell stack. Background Technology

[0002] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy; it is also known as an electrochemical generator. It is the fourth type of power generation technology after hydropower, thermal power generation, and nuclear power generation. Because fuel cells convert the Gibbs free energy portion of the fuel's chemical energy into electrical energy through an electrochemical reaction, they are not limited by the Carnot cycle effect, resulting in high conversion efficiency. Furthermore, fuel cells use fuel and oxygen as raw materials and have no mechanical transmission parts, so the reaction products are pollution-free, the emissions of harmful gases are minimal, and the lifespan is long. Therefore, from the perspective of energy conservation and environmental protection, fuel cells are the most promising power generation technology.

[0003] With the development of fuel cell technology, fuel cells are now trending towards a modular and unitary structural design, consisting of fuel cell units stacked in series or parallel and then packaged together, hence the name fuel cell stack or fuel cell assembly. Each individual fuel cell assembly mainly consists of bipolar plates and membrane electrode assemblies (MEAs). Taking a hydrogen-oxygen fuel cell as an example, air (oxygen from the air) flows between the cathode plate and the MEA, hydrogen flows between the anode plate and the MEA, and a cooling fluid flows between the cathode plate and the anode plate. The reactions that occur in a hydrogen-oxygen fuel cell are as follows:

[0004] Anode (fuel electrode): H2 == 2H + + 2e - ;

[0005] Cathode (air electrode): 2H + + 1 / 2O2 + 2e - == H2O;

[0006] Battery reaction: H2 + 1 / 2O2 == H2O.

[0007] The flow rates of hydrogen and air in the bipolar plate directly affect the reaction efficiency of the fuel cell, especially the air velocity, which is positively correlated with the fuel cell performance. However, in the prior art "An Ultrathin Bipolar Plate for Fuel Cells and Fuel Cell Stack (Publication No. CN112164810A)," the gas flow channel undergoes two large-amplitude (90-degree or almost 90-degree) turns between the gas inlet / outlet and the main reaction zone, resulting in high resistance and thus reducing the flow rate of the reacting gas. Furthermore, the width of the gas flow channels in the gas distribution zone is uniform, and the gas flow channels in the main reaction zone are all designed to be divided into three or four streams. This further reduces the flow rate of the reacting gas when passing through the gas flow channels with longer paths on the upper and lower sides, leading to inconsistent gas flow rates across the entire cathode (or anode) plate, and ultimately causing uneven fuel cell reaction.

[0008] Fuel cells, especially proton exchange membrane fuel cells (PEMFCs), are an ideal new energy carrier for the transportation sector. They require high power generation capacity and high energy conversion efficiency, thus necessitating high performance requirements. However, uneven overall reaction in fuel cells can negatively impact performance and even lifespan, creating a technological bottleneck in the industry and limiting their application to some extent. Summary of the Invention

[0009] To address the problems existing in the prior art, this invention provides a fuel cell module unit and a fuel cell stack. By improving the structure of the anode and cathode bipolar plates, the consistency of the overall gas flow rate on the anode and cathode plates is enhanced, thereby ensuring a more uniform battery reaction.

[0010] To solve the above-mentioned technical problems and achieve the above-mentioned technical effects, the present invention is implemented through the following technical solution:

[0011] A fuel cell module unit includes a cathode plate, an anode plate, a membrane electrode assembly (MEA), a gas seal plate, and a water seal plate. The inner surface of the cathode plate is provided with an oxidation gas flow channel consisting of an oxidation gas inlet / outlet channel, an oxidation gas distribution channel, and an oxidation gas active zone channel. The oxidation gas distribution channel employs a flow-splitting structure design on the path connecting the oxidation gas inlet / outlet channel and the oxidation gas active zone channel, and has at least two obtuse-angle bends. The inner surface of the anode plate is provided with a fuel gas flow channel consisting of a fuel gas inlet / outlet channel, a fuel gas distribution channel, and a fuel gas active zone channel. The fuel gas distribution channel employs a flow-splitting structure design on the path connecting the fuel gas inlet / outlet channel and the fuel gas active zone channel. There is at least one obtuse-angle bend; the membrane electrode is sandwiched between the cathode plate and the anode plate, and the oxidizing gas flow channel is completely offset from the fuel gas flow channel; the cavity formed between the oxidizing gas flow channel and the membrane electrode serves as the oxidizing gas flow channel, and the cavity formed between the fuel gas flow channel and the membrane electrode serves as the fuel gas flow channel, and the boundary seals of the oxidizing gas flow channel and the fuel gas flow channel are respectively achieved by the gas sealing plate; after the cathode plate is attached to the previous anode plate, or after the anode plate is attached to the next cathode plate, the cavity formed between the two serves as the cooling liquid flow channel, and the boundary seals of the cooling liquid flow channel are achieved by the water sealing plate.

[0012] Furthermore, the inner surface of the cathode plate is provided with a first sunken plane. One pair of diagonally opposite sides of the first sunken plane extends outward to form the oxidation gas inlet / outlet channel. One of the oxidation gas inlet / outlet channels is used for the entry of oxidation gas, and the other is used for the discharge of oxidation gas. Several straight raised ribs with equal spacing are arranged side by side from top to bottom in the middle of the first sunken plane. The straight grooves formed between adjacent straight raised ribs form the oxidation gas active zone channel. Several first bent raised ribs with unequal spacing are provided on the left and right sides of the first sunken plane. The bent grooves formed between adjacent first bent raised ribs form the oxidation gas distribution zone channel. The inner end of each first bent raised rib is connected to the outer end of the straight raised rib at intervals, thereby forming a flow splitting structure between the oxidation gas distribution zone channel and the oxidation gas active zone channel.

[0013] Furthermore, the oxidizing gas distribution zone flow channel is divided into a short-range oxidizing gas distribution flow channel for communicating with the oxidizing gas active zone flow channel on the side close to the oxidizing gas inlet / outlet flow channel, and a long-range oxidizing gas distribution flow channel for communicating with the oxidizing gas active zone flow channel on the side far from the oxidizing gas inlet / outlet flow channel; wherein,

[0014] The path of the oxidizing gas short-range distribution channel is in the form of "horizontal-oblique-horizontal", and the angles of the two bends on the path are both obtuse angles; the first bend protruding rib that constitutes the oxidizing gas short-range distribution channel is composed of a horizontal straight rib segment that connects with the oxidizing gas inlet and outlet channel and an oblique rib segment that connects with the oxidizing gas active zone channel.

[0015] The path of the remote distribution channel for oxidizing gas is in the form of "oblique-vertical-oblique-horizontal"; the angles of the three bends and turns on the path are all obtuse angles; the first bend protruding rib that constitutes the remote distribution channel for oxidizing gas is composed of a long oblique line segment rib that connects with the channel of oxidizing gas inlet and outlet, a vertical straight line segment rib, and a short oblique line segment rib that connects with the channel of oxidizing gas active zone.

[0016] Furthermore, in the first bent protruding rib constituting the near-field distribution channel of the oxidizing gas, the outer ends of all its transverse straight segments are connected to the oxidizing gas inlet / outlet channel, and the inner ends of all its oblique line segments are connected to the straight protruding rib constituting the active zone channel of the oxidizing gas in a "one-alternate-one", "one-alternate-two", "one-alternate-three", "one-alternate-four", or "one-alternate-five" manner, thereby forming a "one-divided-into-two", "one-divided-into-three", "one-divided-into-four", "one-divided-into-five", or "one-divided-into-six" diversion structure at the junction of the near-field distribution channel of the oxidizing gas and the active zone channel of the oxidizing gas.

[0017] Between each of the three groups of adjacent inclined rib segments closest to the long side of the cathode plate, there is a short-range diversion auxiliary rib segment parallel to the inclined rib segment. The inner end of each short-range diversion auxiliary rib segment is connected to the end of one of the straight protruding rib segments located between its respective two adjacent inclined rib segments, thereby further forming a "one-to-three" or "one-to-two" diversion structure at the junction of the oxidizing gas short-range distribution channel and the oxidizing gas active zone channel.

[0018] Furthermore, in the first bent protruding rib constituting the oxidizing gas remote distribution channel, the outer ends of all the long oblique line segment ribs are connected to the oxidizing gas inlet / outlet channel, and the inner ends of all the short oblique line segment ribs are connected to the straight protruding rib constituting the oxidizing gas active zone channel in a "one-alternate-one" manner, thereby forming a "one-divided-into-two" diversion structure at the junction of the oxidizing gas remote distribution channel and the oxidizing gas active zone channel.

[0019] Furthermore, a remote diversion auxiliary rib parallel to the short oblique segment rib is provided between all two adjacent short oblique segment ribs, and the inner end of each remote diversion auxiliary rib is connected to the end of the straight protruding rib located between its respective two adjacent short oblique segment ribs.

[0020] Furthermore, in the near-field distribution channel of the oxidizing gas, several transverse straight rib segments of the first bent protruding rib near the long edge of the cathode plate are removed; simultaneously, in the far-field distribution channel of the oxidizing gas, several long oblique rib segments of the first bent protruding rib near the transverse centerline of the cathode plate are removed; thereby forming two "plain" terrains on the upper and lower sides of the connection between the oxidizing gas distribution area channel and the oxidizing gas inlet / outlet area channel.

[0021] The two "plain" terrains located on the upper and lower sides of the oxidizing gas distribution zone flow channel can better increase the flow rate of oxidizing gas entering the upper and lower oxidizing gas active zone flow channels, thereby further ensuring the consistency of the oxidizing gas flow rate between the upper and lower oxidizing gas active zone flow channels and the middle oxidizing gas active zone flow channel.

[0022] Furthermore, the inner surface of the anode plate is provided with a second sunken plane. One pair of diagonally opposite sides of the second sunken plane extends outward to form the fuel gas inlet / outlet channel. The fuel gas inlet / outlet channel is provided with fuel gas guiding protrusions. One of the fuel gas inlet / outlet channels is used for fuel gas entry, and the other is used for fuel gas exit. In the middle of the second sunken plane, several equally spaced wavy raised ribs are arranged side by side from top to bottom. The wavy grooves formed between adjacent wavy raised ribs form the fuel gas active zone channel. On the left and right sides of the second sunken plane, several second bent raised ribs with unequal spacing are provided. The bent grooves formed between adjacent second bent raised ribs form the fuel gas distribution zone channel. The inner end of each second bent raised rib is connected to the outer end of the wavy raised rib at intervals, thereby forming a flow separation structure between the fuel gas distribution zone channel and the fuel gas active zone channel.

[0023] Furthermore, the outer side frame of the anode plate is provided with a water seal plate cavity groove for embedding the water seal plate. Cooling liquid inlet and outlet are respectively provided on the left and right sides of the water seal plate cavity groove. The cooling liquid inlet and outlet are located between the oxidizing gas inlet / outlet channel and the fuel gas inlet / outlet channel. The cooling liquid inlet and outlet are provided with a primary cooling liquid guide strip near the outer side and a secondary cooling liquid guide strip near the inner side, and a cooling liquid guide column is provided between a portion of the primary cooling liquid guide strip and a portion of the secondary cooling liquid guide strip.

[0024] Furthermore, an oxidizing gas inlet and outlet hole is provided on one pair of diagonally opposite left and right sides of the gas sealing plate, and a fuel gas inlet and outlet hole is provided on the other pair of diagonally opposite left and right sides of the gas sealing plate. Both the oxidizing gas inlet and outlet hole and the fuel gas inlet and outlet hole adopt a multi-hole design and are distributed in a way that is inclined towards the transverse centerline of the gas sealing plate.

[0025] When the gas sealing plate is attached to the cathode plate, a pair of oxidizing gas inlet and outlet holes on the gas sealing plate correspond to and align with a pair of oxidizing gas inlet and outlet flow channels on the cathode plate. The gas sealing plate seals all boundaries around the cathode plate except for the oxidizing gas inlet and outlet flow channels, and forms a narrow oxidizing gas inlet and outlet channel with an internal height smaller than the oxidizing gas flow channel between the oxidizing gas inlet and outlet holes and the outer edge of the cathode plate of the oxidizing gas inlet and outlet channel.

[0026] When the gas sealing plate is attached to the anode plate, a pair of fuel gas inlet and outlet holes on the gas sealing plate correspond to and align with a pair of fuel gas inlet and outlet channels on the cathode plate. The gas sealing plate seals all boundaries around the anode plate except for the fuel gas inlet and outlet channels, and forms a narrow fuel gas inlet and outlet channel with an internal height smaller than the fuel gas flow channel between the fuel gas inlet and outlet holes and the outer edge of the anode plate outside the fuel gas inlet and outlet channels.

[0027] A fuel cell stack is formed by stacking and encapsulating several of the aforementioned fuel cell cell module units in series.

[0028] The beneficial effects of this invention are as follows:

[0029] This invention optimizes the structure of the anode and cathode bipolar plates in fuel cells. On the one hand, it changes the angle at which the gas flow channel needs to undergo two significant turns from a right angle to an oblique angle, thereby greatly reducing the airflow resistance. On the other hand, it reduces the "one-to-three" splitting structure on the gas flow channel of the cathode plate, and adopts a "one-to-two" splitting structure instead. The "one-to-three" splitting structure is designed as much as possible on both sides of the long side of the cathode plate, which can effectively reduce the influence of the separated flow. This ensures that the flow velocity of the oxidation gas flow channel on the upper and lower sides of the cathode plate, which are farther away, is not significantly slower than the flow velocity of the oxidation gas flow channel on the middle side, which is closer. This greatly improves the consistency of the oxidation gas flow velocity on the entire cathode plate, resulting in a more uniform reaction.

[0030] This invention appropriately reduces the raised ribs on the upper and lower sides of the cathode plate oxidation gas distribution zone flow channel to form two "plain" terrains. This better solves the problem of slowed flow rate caused by the oxidation gas on the upper and lower sides of the cathode plate having to undergo two large turns. It can effectively increase the flow rate of oxidation gas entering the upper and lower oxidation gas active zone flow channels, thereby further ensuring the consistency of the oxidation gas flow rate between the upper and lower oxidation gas active zone flow channels and the middle oxidation gas active zone flow channel, making the reaction more uniform.

[0031] This invention designs the oxidation gas active zone flow channel of the cathode plate as a straight line and the fuel gas active zone flow channel of the anode plate as a wave shape. The staggered flow channels of the cathode and anode plates not only help to generate uniform electrochemical reactions of the membrane electrode, but also allow the cooling liquid flow channels on the outer sides of the cathode and anode plates to form an interlaced shape, thereby ensuring the cooling effect of the cooling liquid.

[0032] The oxidizing gas inlet and outlet narrow channel and the fuel gas inlet and outlet narrow channel of the present invention are both designed as channels with narrow internal space, so that the gas flow can be accelerated when passing through the narrow channel, thereby further improving the reaction efficiency.

[0033] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0035] Figure 1 This is an exploded view of the fuel cell module unit of the present invention;

[0036] Figure 2This is a schematic diagram of the inner side surface of the cathode plate of the present invention;

[0037] Figure 3 This is a schematic diagram of the raised rib structure on the inner side of the cathode plate of the present invention;

[0038] Figure 4 This is a schematic diagram of the raised rib structure of the oxidation gas short-range distribution channel of the cathode plate of the present invention;

[0039] Figure 5 This is a schematic diagram of the raised rib structure of the oxidation gas remote distribution channel of the cathode plate of the present invention;

[0040] Figure 6 This is a diagram showing the velocity distribution of the oxidizing gas after the protruding ribs on the upper and lower sides of the oxidizing gas inlet and outlet have been removed in this invention.

[0041] Figure 7 This is a diagram showing the velocity distribution of the oxidizing gas when the raised ribs on the upper and lower sides of the oxidizing gas inlet and outlet are not removed in this invention.

[0042] Figure 8 This is a schematic diagram of the inner side surface of the anode plate of the present invention;

[0043] Figure 9 This is a schematic diagram of the raised rib structure on the inner side of the anode plate of the present invention;

[0044] Figure 10 This is a schematic diagram of the outer side surface of the cathode plate of the present invention;

[0045] Figure 11 This is a schematic diagram of the outer side surface of the anode plate of the present invention;

[0046] Figure 12 This is a schematic diagram of the structure of the water seal plate of the present invention;

[0047] Figure 13 This is a schematic diagram of the structure of the air-sealing plate of the present invention;

[0048] Figure 14 This is a schematic diagram of the structure of the cathode plate and the gas seal plate after they are bonded together according to the present invention;

[0049] Figure 15 This is a cross-sectional view of the narrow channel for oxidizing gas to enter and exit formed after the cathode plate and the gas sealing plate of the present invention are bonded together;

[0050] Figure 16 This is a schematic diagram of the structure after the anode plate and the gas seal plate of the present invention are bonded together;

[0051] Figure 17 This is a cross-sectional view of the narrow channel for fuel gas entry and exit formed after the anode plate and the gas sealing plate of the present invention are bonded together. Detailed Implementation

[0052] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the invention's purpose, features, and advantages. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the invention, but are merely illustrative of the essential spirit of the invention's technical solution.

[0053] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0054] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0055] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0056] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0057] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] See Figure 1 As shown, a fuel cell module unit mainly consists of a cathode plate 1, an anode plate 2, a membrane electrode 3, a gas seal plate 4, and a water seal plate 5. One side of the membrane electrode 3 is attached to the inner side of the anode plate 2 through the gas seal plate 4. The inner side of the cathode plate 1 is attached to the other side of the membrane electrode 3 and the gas seal plate 4. The water seal plate 5 is embedded in the outer side of the anode plate 2.

[0059] See Figure 2As shown, the inner side of the cathode plate 1 is provided with an oxidation gas channel 10, which consists of an oxidation gas inlet / outlet channel 101, an oxidation gas distribution channel 102, and an oxidation gas active channel 103. The oxidation gas distribution channel 102 adopts a flow-dividing structure design on the path connecting the oxidation gas inlet / outlet channel 101 and the oxidation gas active channel 103, and has at least two obtuse-angle bends.

[0060] See Figure 3 As shown, in one embodiment of the cathode plate 1 of the present invention, the inner side of the cathode plate 1 is provided with a first sunken plane. One pair of left and right diagonally opposite sides of the first sunken plane extends outward to form the oxidation gas inlet and outlet flow channels 101. One of the oxidation gas inlet and outlet flow channels 101 is used for the entry of oxidation gas, and the other oxidation gas inlet and outlet flow channel 101 is used for the discharge of oxidation gas.

[0061] The middle part of the first sunken plane is provided with several straight raised ribs 104 with equal spacing from top to bottom, and the straight grooves formed between adjacent straight raised ribs 104 form the flow channel 103 of the oxidizing gas active zone.

[0062] Several first bent protruding ribs 105 with unequal spacing are respectively provided on the left and right sides of the first sunken plane. The bending groove formed between adjacent first bent protruding ribs 105 forms the oxidation gas distribution area flow channel 102. The inner end of each first bent protruding rib 105 is connected to the outer end of the straight protruding rib 104 at intervals, thereby forming a flow splitting structure at the intersection of the oxidation gas distribution area flow channel 102 and the oxidation gas active area flow channel 103.

[0063] Since the straight raised rib 104 and the first bent raised rib 105 are both rolled from the outer side of the cathode plate 1 inward, when the membrane electrode 3 is attached to the cathode plate 1, the straight raised rib 104 and the first bent raised rib 105 support the membrane electrode 3 and form a cavity between the oxidation gas flow channel 10 and the membrane electrode 3, thereby serving as an oxidation gas flow channel.

[0064] See Figure 3 As shown, in one embodiment of the cathode plate 1 of the present invention, the oxidation gas distribution zone channel 102 is divided into an oxidation gas short-range distribution channel for communicating with the oxidation gas active zone channel 103 on the side close to the oxidation gas inlet / outlet zone channel 101, and an oxidation gas long-range distribution channel for communicating with the oxidation gas active zone channel 103 on the side far from the oxidation gas inlet / outlet zone channel 101.

[0065] See Figure 4 As shown, in one embodiment of the cathode plate 1 of the present invention, the path of the oxidizing gas short-range distribution channel is in the form of "horizontal-oblique-horizontal", and the angles of the two bends on the path are both obtuse angles, thereby significantly reducing the airflow resistance; the first bent protruding rib 105 constituting the oxidizing gas short-range distribution channel is composed of a horizontal straight rib segment 105a that connects with the oxidizing gas inlet / outlet channel 101 and an oblique rib segment 105b that connects with the oxidizing gas active zone channel 103; wherein,

[0066] The outer ends of the transverse straight ribs 105a are all connected to the oxidizing gas inlet / outlet channel 101. The inner ends of all the oblique ribs 105b are connected to the straight protruding ribs 104 constituting the oxidizing gas active zone channel 103 in a "one-alternate-one", "one-alternate-two", "one-alternate-three", "one-alternate-four", or "one-alternate-five" manner, thereby forming a "one-divided-into-two", "one-divided-into-three", "one-divided-into-four", "one-divided-into-five", or "one-divided-into-six" diversion structure at the junction of the oxidizing gas short-range distribution channel and the oxidizing gas active zone channel 103.

[0067] Between each of the three groups of adjacent inclined rib segments 105b closest to the long side of the cathode plate 1, there is a short-range diversion auxiliary rib segment 105c parallel to the inclined rib segment 105b. The inner end of each short-range diversion auxiliary rib segment 105c is connected to the end of one of the straight protruding rib segments 104 located between its respective two adjacent inclined rib segments 105b, thereby further forming a "one-to-three" or "one-to-two" diversion structure at the junction of the oxidizing gas short-range distribution channel and the oxidizing gas active zone channel 103.

[0068] See Figure 5 As shown, in one embodiment of the cathode plate 1 of the present invention, the path of the oxidizing gas remote distribution channel is in the form of "oblique-vertical-oblique-horizontal"; the angles of the three bends and turns on its path are all obtuse angles, thereby significantly reducing the airflow resistance; the first bent protruding rib 105 constituting the oxidizing gas remote distribution channel is composed of a long oblique line segment rib 105d that connects to the oxidizing gas inlet / outlet channel 101, a vertical straight line segment rib 105e, and a short oblique line segment rib 105f that connects to the oxidizing gas active zone channel 103; wherein,

[0069] The outer ends of all the long oblique rib segments are connected to the oxidizing gas inlet / outlet channel 101, and the inner ends of all the short oblique rib segments 105f are connected to the straight protruding ribs 104 constituting the oxidizing gas active zone channel 103 in a "one-alternate-one" manner, thereby forming a "one-divided-into-two" diversion structure at the junction of the oxidizing gas remote distribution channel and the oxidizing gas active zone channel 103.

[0070] Furthermore, a remote diversion auxiliary rib 105g parallel to the short oblique segment rib 105f is provided between all two adjacent short oblique segment ribs 105f, and the inner end of each remote diversion auxiliary rib 105g is connected to the end of the straight protruding rib 104 located between its respective two adjacent short oblique segment ribs 105f.

[0071] See Figure 4-5 As shown, in a preferred embodiment of the oxidizing gas diversion of the present invention, the diversion form of the oxidizing gas distribution zone flow channel 102 at the connection with the oxidizing gas active zone flow channel 103 is as follows:

[0072] In the near-field distribution channel for the oxidizing gas, the first inclined segment rib 105b from top to bottom is connected to the second straight raised rib 104 from top to bottom; the second inclined segment rib 105b from top to bottom is connected to the eighth straight raised rib 104 from top to bottom; the near-field diversion auxiliary segment rib 105c located between the first and second inclined segment ribs 105b is connected to the fifth straight raised rib 104 from top to bottom; the third inclined segment rib 105b from top to bottom is connected to the thirteenth straight raised rib 104 from top to bottom; and the segment located between the second and third inclined segment ribs 105b... The short-range diversion auxiliary segment rib 105c is connected to the 11th straight raised rib 104 from top to bottom; the 4th oblique segment rib 105b from top to bottom is connected to the 17th straight raised rib 104 from top to bottom; the short-range diversion auxiliary segment rib 105c located between the 3rd and 4th oblique segment ribs 105b is connected to the 15th straight raised rib 104 from top to bottom; starting after the 5th oblique segment rib 105b from top to bottom is connected to the 19th straight raised rib 104 from top to bottom, each oblique segment rib 105b is connected to the other corresponding straight raised ribs 104 in a "one-every-one" manner.

[0073] In the remote distribution channel of the oxidizing gas, the inner ends of all the short oblique rib segments 105f are connected to the corresponding straight protruding ribs 104 in a "one-every-one" manner; thus, the oxidizing gas distribution channel 102 is ultimately formed in which only the three streams near the long side of the cathode plate 1 are divided into three streams, while the rest are divided into two streams. One design feature of this invention is to reduce the number of "one-to-three" stream structures and adopt more "one-to-two" stream structures, and to design the "one-to-three" stream structures as close as possible to the long side of the cathode plate 1. This can effectively reduce the influence of the separated flow, so that the flow velocity of the oxidizing gas channels with longer paths on the upper and lower sides of the cathode plate 1 is not significantly slower than that of the oxidizing gas channels with shorter paths in the middle, thereby greatly improving the consistency of the oxidizing gas flow velocity on the entire cathode plate 1 and making the reaction more uniform.

[0074] See Figure 6 As shown, in one embodiment of the cathode plate 1 of the present invention, several transverse straight rib segments of the first bent protruding rib 105 near the long frame of the cathode plate 1 can be appropriately removed in the short-range distribution channel of the oxidizing gas; simultaneously, several long oblique rib segments of the first bent protruding rib 105 near the transverse centerline of the cathode plate 1 can be appropriately removed in the long-range distribution channel of the oxidizing gas; thereby forming two plates on the upper and lower sides of the connection between the oxidizing gas distribution area channel 102 and the oxidizing gas inlet / outlet area channel 101. Figure 6 The "plain" terrain is shown in the middle circle;

[0075] By comparison Figure 6 and Figure 7 It can be seen that the "plain" terrain located on the upper and lower sides of the oxidation gas distribution zone flow channel 102 can better solve the problem of the slow flow rate caused by the oxidation gas on the upper and lower sides of the cathode plate 1 having to undergo two large turns. It can effectively increase the flow rate of the oxidation gas entering the upper and lower oxidation gas active zone flow channels 103, thereby further ensuring the consistency of the oxidation gas flow rate between the upper and lower oxidation gas active zone flow channels 103 and the middle oxidation gas active zone flow channel 103, making the reaction more uniform.

[0076] It should be noted that since both the cathode plate 1 and the anode plate 2 are made of ultra-thin metal plates, the number of transverse straight ribs and long oblique ribs of the first bent protruding rib 105 should not be reduced too much. This is because, in addition to forming flow channels, the ribs also serve to support the membrane electrode 3. If the number of ribs is reduced too much, the supporting force between the cathode plate 1 and the membrane electrode 3 will be significantly reduced.

[0077] See Figure 8 As shown, the inner side of the anode plate 2 is provided with a fuel gas flow channel 20, which consists of a fuel gas inlet / outlet flow channel 201, a fuel gas distribution flow channel 202, and a fuel gas active flow channel 203. The fuel gas distribution flow channel 202 adopts a flow splitting structure design on the path connecting the fuel gas inlet / outlet flow channel 201 and the fuel gas active flow channel 203, and there is at least one obtuse bend.

[0078] See Figure 9 As shown, in one embodiment of the anode plate 2 of the present invention, the inner side of the anode plate 2 is provided with a second recessed plane. One pair of the left and right diagonally opposite sides of the second recessed plane extends outward to form the fuel gas inlet and outlet channel 201. The fuel gas inlet and outlet channel 201 is provided with a fuel gas guiding protrusion 204. One of the fuel gas inlet and outlet channels 201 is used for the entry of fuel gas, and the other fuel gas inlet and outlet channel 201 is used for the discharge of fuel gas.

[0079] The second sunken plane has several wavy raised ribs 205 arranged side by side from top to bottom in the middle. The wavy groove formed between adjacent wavy raised ribs 205 forms the fuel gas active area flow channel 203. The wavy design helps the electrochemical reaction of the membrane electrode 3 to be generated uniformly.

[0080] On the left and right sides of the second sunken plane, there are several second bent protruding ribs 206 with unequal spacing. The bending groove formed between adjacent second bent protruding ribs 206 forms the fuel gas distribution area channel 202. The inner end of each second bent protruding rib 206 is connected to the outer end of the wavy protruding rib 205 at intervals, thereby forming a flow splitting structure between the fuel gas distribution area channel 202 and the fuel gas active area channel 203.

[0081] Since the wavy raised ribs 205 and the second bent raised ribs 206 are both rolled from the outer side of the anode plate 2 inward, when the membrane electrode 3 is attached to the anode plate 2, the wavy raised ribs 205 and the second bent raised ribs 206 support the membrane electrode 3 and form a cavity between the fuel gas flow channel 20 and the membrane electrode 3, thereby serving as a fuel gas flow channel.

[0082] See Figure 10As shown, in one embodiment of the anode plate 2 of the present invention, the fuel gas distribution zone channel 202 is divided into a short-range fuel gas distribution channel for communicating with the fuel gas active zone channel 203 on the side close to the fuel gas inlet / outlet zone channel 201, and a long-range fuel gas distribution channel for communicating with the fuel gas active zone channel 203 on the side far from the fuel gas inlet / outlet zone channel 201; wherein,

[0083] The path of the fuel gas short-range distribution channel is in a "horizontal-oblique" form, and the angle of each bend in the path is an obtuse angle; the path of the fuel gas long-range distribution channel is in an "oblique-vertical-oblique" form, and the angles of both bends in the path are obtuse angles; the shapes of the first bent protruding rib 105 constituting the oxidizing gas short-range distribution channel and the first bent protruding rib 105 constituting the oxidizing gas long-range distribution channel are respectively related to the fuel gas short-range distribution channel and the fuel gas long-range distribution channel. The flow path shapes are matched; the outer end of each of the first bent protruding ribs 105 is connected to the fuel gas inlet / outlet flow channel 201, and the inner end of each of the first bent protruding ribs 105 is connected to the wavy protruding ribs 205 constituting the fuel gas active zone flow channel 203 in a "one-alternate-one" or "one-alternate-two" manner, thereby forming a "one-divided-into-two" or "one-divided-into-three" flow splitting structure at the junction of the fuel gas distribution zone flow channel 202 and the oxidation gas active zone flow channel 103.

[0084] See Figure 10 As shown, since the straight raised rib 104 and the first bent raised rib 105 are both rolled from the outer side of the cathode plate 1 inward, a straight cooling liquid flow channel 106 is formed mirror-imagely on the outer side of the cathode plate 1. At the same time, dispersed contact points 107 are provided on the long side of the outer side of the cathode plate 1. When the cathode plate 1 is attached to the anode plate 2 of another fuel cell cell module unit, the outer side of the cathode plate 1 and the outer side of the anode plate 2 of the other fuel cell cell module unit form electrical contact through the dispersed contact points 107.

[0085] See Figure 11As shown, since the wavy raised rib 205 and the second bent raised rib 206 are both rolled from the outer side of the anode plate 2 inward, a wavy cooling liquid flow channel 207 is formed mirror-image on the outer side of the anode plate 2. At the same time, a water seal plate cavity groove 208 for embedding the water seal plate 5 is provided on the frame of the outer side of the anode plate 2. Cooling liquid inlet and outlet 209 are respectively provided on the left and right sides of the water seal plate cavity groove 208. The cooling liquid inlet and outlet 209 are located between the oxidation gas inlet and outlet flow channel 101 and the fuel gas inlet and outlet flow channel 201. A primary cooling liquid guide strip 210a near the outer side and a secondary cooling liquid guide strip 210b near the inner side are provided on the cooling liquid inlet and outlet 209. A cooling liquid guide column 210c is provided between a portion of the primary cooling liquid guide strip 210a and a portion of the secondary cooling liquid guide strip 210b.

[0086] The fuel cell module unit of this invention can be used as a single piece or multiple pieces can be combined and stacked in series. When used as a single piece, a cover plate needs to be attached to the outer side of the cathode plate 1 and the outer side of the anode plate 2 of the single fuel cell module unit to form a fuel cell composed of a single fuel cell module unit. When multiple pieces are combined and stacked in series, the cathode plate 1 of the first fuel cell module unit is attached to the anode plate 2 of the second fuel cell module unit, and so on, until all fuel cell module units are completed in series and stacked. Finally, cover plates are attached to the outer side of the anode plate 2 of the first fuel cell module unit and the outer side of the cathode plate 1 of the last fuel cell module unit, respectively, thereby forming a fuel cell stack or fuel cell pile composed of multiple fuel cell module units.

[0087] After the cathode plate 1 is attached to the preceding anode plate 2, or after the anode plate 2 is attached to the following cathode plate 1, the cavity formed between the straight cooling liquid channel 106 and the wavy cooling liquid channel 207 serves as the cooling liquid flow channel, and then through... Figure 12 The water seal plate 5 shown seals the boundaries of all cooling liquid flow channels except for the cooling liquid inlet and outlet 209; and since the paths of the straight cooling liquid flow channel 106 and the wavy cooling liquid flow channel 207 are completely staggered, the cooling effect of the cooling liquid can be ensured, and the reaction can be further ensured to be uniform.

[0088] See Figure 13As shown, an oxidizing gas inlet / outlet hole 401 is provided on one pair of diagonally opposite left and right sides of the gas sealing plate 4, and a fuel gas inlet / outlet hole 402 is provided on the other pair of diagonally opposite left and right sides of the gas sealing plate 4. Both the oxidizing gas inlet / outlet hole 401 and the fuel gas inlet / outlet hole 402 adopt a multi-hole design and are distributed in a way that is inclined towards the transverse centerline of the gas sealing plate 4.

[0089] As one embodiment of the gas sealing plate 4 of the present invention, the gas sealing plate 4 may have a pair of oxidizing gas inlet and outlet holes 401 designed in the upper left corner and the lower right corner, and a pair of fuel gas inlet and outlet holes 402 designed in the lower left corner and the upper right corner; conversely, the gas sealing plate 4 may also have a pair of oxidizing gas inlet and outlet holes 401 designed in the lower left corner and the upper right corner, and a pair of fuel gas inlet and outlet holes 402 designed in the upper left corner and the lower right corner.

[0090] See Figure 14 As shown, when the gas sealing plate 4 is attached to the cathode plate 1, the pair of oxidizing gas inlet / outlet holes 401 on the gas sealing plate 4 correspond to the positions of the pair of oxidizing gas inlet / outlet channels 101 on the cathode plate 1. At this time, the inner end of the oxidizing gas inlet / outlet hole 401 is aligned with the oxidizing gas inlet / outlet channel 101, and the outer end of the oxidizing gas inlet / outlet hole 401 protrudes outward from the short frame of the cathode plate 1. When the gas sealing plate 4 and the membrane electrode 3 are simultaneously clamped between the cathode plate 1 and the anode plate 2, the gas sealing plate 4 seals all boundaries around the cathode plate 1 except for the oxidizing gas inlet / outlet channels 101. See also... Figure 15 As shown, at this time, there is a gap between the short frame of the cathode plate 1 and the short frame of the anode plate 2 located on both sides of the oxidizing gas inlet / outlet hole 401. This gap is the oxidizing gas inlet / outlet narrow channel 403. The oxidizing gas inlet / outlet narrow channel 403 not only has a height difference with the oxidizing gas inlet / outlet flow channel 101, but also the internal space height of the oxidizing gas inlet / outlet narrow channel 403 is smaller than the internal space height of the oxidizing gas flow channel. That is to say, before the oxidizing gas enters the oxidizing gas flow channel 10, it needs to pass through this relatively narrow oxidizing gas inlet / outlet narrow channel 403 before it can enter the oxidizing gas inlet / outlet flow channel 101, and then through the oxidizing gas distribution zone flow channel 102 and finally into the oxidizing gas active zone flow channel 103. This allows the gas flow to be accelerated by a Venturi effect when passing through this narrow channel, further improving the reaction efficiency.

[0091] Similarly, see Figure 16As shown, when the gas sealing plate 4 is attached to the anode plate 2, the pair of fuel gas inlet / outlet holes 402 on the gas sealing plate 4 correspond to the positions of the pair of fuel gas inlet / outlet channels 201 on the cathode plate 1. At this time, the inner end of the fuel gas inlet / outlet hole 402 is aligned with the fuel gas inlet / outlet channel 201, and the outer end of the fuel gas inlet / outlet hole 402 protrudes outward from the short frame of the anode plate 2. When the gas sealing plate 4 and the membrane electrode 3 are simultaneously clamped between the cathode plate 1 and the anode plate 2, the gas sealing plate 4 seals all boundaries around the anode plate 2 except for the fuel gas inlet / outlet channels 201. See also... Figure 17 As shown, there is a gap between the short frame of the cathode plate 1 and the short frame of the anode plate 2 located on both sides of the fuel gas inlet / outlet port 402. This gap is the narrow fuel gas inlet / outlet channel 404. The narrow fuel gas inlet / outlet channel 404 not only has a height difference from the fuel gas inlet / outlet flow channel 201, but also the internal space height of the narrow fuel gas inlet / outlet channel 404 is smaller than the internal space height of the fuel gas flow channel. In other words, before the fuel gas enters the fuel gas flow channel 20, it needs to pass through this narrow fuel gas inlet / outlet channel 404 before entering the fuel gas inlet / outlet flow channel 201, and then through the fuel gas distribution zone flow channel 202 before finally entering the fuel gas active zone flow channel 203. This allows the gas flow to be accelerated by a Venturi effect when passing through this narrow channel, further improving the reaction efficiency.

[0092] The present invention also provides a fuel cell stack, which is formed by stacking and encapsulating several of the above-described fuel cell cell module units in series.

[0093] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0094] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fuel cell module unit, comprising a cathode plate (1), an anode plate (2), a membrane electrode assembly (3), a gas seal plate (4), and a water seal plate (5), characterized in that, The inner side of the cathode plate (1) is provided with an oxidation gas channel (10) consisting of an oxidation gas inlet / outlet channel (101), an oxidation gas distribution channel (102), and an oxidation gas active zone channel (103). The oxidation gas distribution channel (102) adopts a flow splitting structure design on the path connecting the oxidation gas inlet / outlet channel (101) and the oxidation gas active zone channel (103), and has at least two obtuse angle bends. The inner surface of the cathode plate (1) is provided with a first recessed plane. One pair of diagonally opposite sides of the first recessed plane extends outward to form the oxidation gas inlet / outlet channel (101). One of the oxidation gas inlet / outlet channels (101) is used for the entry of oxidation gas, and the other oxidation gas inlet / outlet channel (101) is used for the discharge of oxidation gas. Several straight raised ribs (104) with equal spacing are arranged side by side from top to bottom in the middle of the first recessed plane. The straight grooves formed between adjacent straight raised ribs (104) are... The oxidation gas active zone flow channel (103) is formed; several first bent protruding ribs (105) with unequal spacing are respectively provided on the left and right sides of the first sunken plane, and the bending groove formed between adjacent first bent protruding ribs (105) forms the oxidation gas distribution zone flow channel (102). The inner end of each first bent protruding rib (105) is connected to the outer end of the straight protruding rib (104) at intervals, thereby forming a flow splitting structure between the oxidation gas distribution zone flow channel (102) and the oxidation gas active zone flow channel (103). The oxidizing gas distribution area channel (102) is divided into a short-range oxidizing gas distribution channel for communicating with the oxidizing gas active area channel (103) on the side close to the oxidizing gas inlet / outlet area channel (101), and a long-range oxidizing gas distribution channel for communicating with the oxidizing gas active area channel (103) on the side far from the oxidizing gas inlet / outlet area channel (101); wherein, The path of the oxidizing gas short-range distribution channel is in the form of "horizontal-oblique-horizontal", and the angles of the two bends on the path are both obtuse angles; the first bend protruding rib (105) constituting the oxidizing gas short-range distribution channel is composed of a horizontal straight rib segment that connects with the oxidizing gas inlet / outlet channel (101) and an oblique rib segment that connects with the oxidizing gas active zone channel (103). In the near-field distribution channel of the oxidizing gas, several transverse straight rib segments of the first bent protruding rib (105) near the long frame of the cathode plate (1) are removed; at the same time, in the far-field distribution channel of the oxidizing gas, several long oblique rib segments of the first bent protruding rib (105) near the transverse centerline of the cathode plate (1) are removed; thereby forming two "plain" terrains on the upper and lower sides of the connection between the oxidizing gas distribution area channel (102) and the oxidizing gas inlet and outlet area channel (101). The path of the remote distribution channel for oxidizing gas is in the form of "oblique-vertical-oblique-horizontal"; the angles of the three bends and turns on the path are all obtuse angles; the first bend protruding rib (105) constituting the remote distribution channel for oxidizing gas is composed of a long oblique line segment rib that connects to the oxidizing gas inlet / outlet channel (101), a vertical straight line segment rib, and a short oblique line segment rib that connects to the oxidizing gas active zone channel (103). The inner side of the anode plate (2) is provided with a fuel gas flow channel (20) consisting of a fuel gas inlet / outlet flow channel (201), a fuel gas distribution flow channel (202), and a fuel gas active flow channel (203). The fuel gas distribution flow channel (202) adopts a flow splitting structure design on the path connecting the fuel gas inlet / outlet flow channel (201) and the fuel gas active flow channel (203), and there is at least one obtuse bend. The membrane electrode (3) is sandwiched between the cathode plate (1) and the anode plate (2), and the oxidation gas flow channel (10) is completely offset from the fuel gas flow channel (20). The cavity formed between the oxidation gas flow channel (10) and the membrane electrode (3) serves as the oxidation gas flow channel, and the cavity formed between the fuel gas flow channel (20) and the membrane electrode (3) serves as the fuel gas flow channel. The gas sealing plate (4) respectively seals the boundary of the oxidation gas flow channel and the fuel gas flow channel. After the cathode plate (1) of this block is attached to the anode plate (2) of the previous block, or after the anode plate (2) of this block is attached to the cathode plate (1) of the next block, the cavity formed between the two serves as a cooling liquid flow channel, and the water seal plate (5) achieves boundary sealing of the cooling liquid flow channel.

2. The fuel cell module unit according to claim 1, characterized in that, In the first bent protruding rib (105) constituting the oxidizing gas short-range distribution channel, the outer ends of all its transverse straight segments are connected to the oxidizing gas inlet / outlet channel (101), and the inner ends of all its oblique line segments are connected to the straight protruding ribs (104) constituting the oxidizing gas active zone channel (103) in a "one-alternate-one", "one-alternate-two", "one-alternate-three", "one-alternate-four", or "one-alternate-five" manner, thereby forming a "one-divided-into-two", "one-divided-into-three", "one-divided-into-four", "one-divided-into-five", or "one-divided-into-six" diversion structure at the junction of the oxidizing gas short-range distribution channel and the oxidizing gas active zone channel (103). Between the three groups of adjacent inclined rib segments closest to the long side of the cathode plate (1), there is a short-range diversion auxiliary rib segment (105c) parallel to the inclined rib segment. The inner end of each of the short-range diversion auxiliary rib segments (105c) is connected to the end of one of the straight protruding rib segments (104) located between the two adjacent inclined rib segments to which it belongs, thereby further forming a "one-to-three" or "one-to-two" diversion structure at the junction of the near-range distribution channel of the oxidizing gas and the active zone channel of the oxidizing gas (103).

3. The fuel cell module unit according to claim 1, characterized in that, In the first bent protruding rib (105) constituting the oxidizing gas remote distribution channel, the outer ends of all the long oblique line segment ribs are connected to the oxidizing gas inlet and outlet channel (101), and the inner ends of all the short oblique line segment ribs are connected to the straight protruding rib (104) constituting the oxidizing gas active zone channel (103) in a "one-alternate-one" manner, thereby forming a "one-divided-into-two" diversion structure at the junction of the oxidizing gas remote distribution channel and the oxidizing gas active zone channel (103). Furthermore, a remote diversion auxiliary rib (105g) parallel to the short oblique segment rib is provided between all two adjacent short oblique segment ribs, and the inner end of each remote diversion auxiliary rib (105g) is connected to the end of the straight protruding rib (104) located between its respective two adjacent short oblique segment ribs.

4. The fuel cell module unit according to claim 1, characterized in that, The inner surface of the anode plate (2) is provided with a second sunken plane. One pair of diagonally opposite sides of the second sunken plane extends outward to form the fuel gas inlet / outlet channel (201). The fuel gas inlet / outlet channel (201) is provided with fuel gas guiding protrusions (204). One of the fuel gas inlet / outlet channels (201) is used for the entry of fuel gas, and the other fuel gas inlet / outlet channel (201) is used for the discharge of fuel gas. In the middle of the second sunken plane, a number of equally spaced wavy raised ribs (205) are arranged side by side from top to bottom. Adjacent wavy raised ribs The wavy groove formed between the strips (205) forms the fuel gas active zone flow channel (203); several second bent protruding ribs (206) with unequal spacing are respectively provided on the left and right sides of the second sunken plane, and the bent groove formed between adjacent second bent protruding ribs (206) forms the fuel gas distribution zone flow channel (202). The inner end of each second bent protruding rib (206) is connected to the outer end of the wavy protruding rib (205) at intervals, thereby forming a flow splitting structure in the fuel gas distribution zone flow channel (202) and the fuel gas active zone flow channel (203).

5. The fuel cell module unit according to claim 1, characterized in that, The outer side frame of the anode plate (2) is provided with a water seal plate cavity groove (208) for embedding the water seal plate (5). Cooling liquid inlet and outlet (209) are respectively provided on the left and right sides of the water seal plate cavity groove (208). The cooling liquid inlet and outlet (209) are located between the oxidation gas inlet and outlet channel (101) and the fuel gas inlet and outlet channel (201). The cooling liquid inlet and outlet (209) is provided with a primary cooling liquid guide strip (210a) near the outer side and a secondary cooling liquid guide strip (210b) near the inner side. Cooling liquid guide column (210c) is provided between a portion of the primary cooling liquid guide strip (210a) and a portion of the secondary cooling liquid guide strip (210b).

6. The fuel cell module unit according to claim 1, characterized in that, Oxidizing gas inlet and outlet holes (401) are provided on one pair of diagonal left and right sides of the gas sealing plate (4), and fuel gas inlet and outlet holes (402) are provided on the other pair of diagonal left and right sides of the gas sealing plate (4). Both the oxidizing gas inlet and outlet holes (401) and the fuel gas inlet and outlet holes (402) adopt a multi-hole design and are distributed in a way that is inclined towards the transverse centerline of the gas sealing plate (4). When the gas sealing plate (4) is attached to the cathode plate (1), a pair of oxidizing gas inlet and outlet holes (401) on the gas sealing plate (4) correspond to and connect with a pair of oxidizing gas inlet and outlet flow channels (101) on the cathode plate (1). The gas sealing plate (4) seals all boundaries around the cathode plate (1) except for the oxidizing gas inlet and outlet flow channels (101), and forms a narrow oxidizing gas inlet and outlet channel with an internal height smaller than the oxidizing gas flow channel between the oxidizing gas inlet and outlet holes (401) and the outer side of the cathode plate (1) of the oxidizing gas inlet and outlet channel (101). When the gas sealing plate (4) is attached to the anode plate (2), a pair of fuel gas inlet and outlet holes (402) on the gas sealing plate (4) correspond to and connect with a pair of fuel gas inlet and outlet flow channels (201) on the cathode plate (1). The gas sealing plate (4) seals all boundaries around the anode plate (2) except for the fuel gas inlet and outlet flow channels (201), and forms a narrow fuel gas inlet and outlet channel with an internal height smaller than the fuel gas flow channel between the fuel gas inlet and outlet holes (402) and the frame of the anode plate (2) outside the fuel gas inlet and outlet flow channels (201).

7. A fuel cell stack, characterized in that, It is formed by stacking and packaging several fuel cell module units as described in any one of claims 1-6 in series.

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