Bipolar plate and electric pile

Abstract

According to the bipolar plate provided by the invention, the plurality of gas ports are uniformly arranged on the four side edges of the bipolar plate surface, meanwhile, the bipolar plate surface is divided into two reaction areas, and each reaction area comprises at least one group of matched reaction gas inlet and reaction gas outlet and at least one group of oxidized gas inlet and oxidized gas outlet; the arrangement mode of the gas ports is optimized, complex gas flow channel design is not needed, a distribution area is eliminated, the area of the reaction area is greatly increased, the volume power density of the fuel cell is greatly improved, and the volume power density of the fuel cell can be greatly improved by changing the reaction gas in each reaction area and the matching scheme of the gas inlet and the gas outlet of the reaction gas. And the flowing modes of hydrogen and air in each reaction area are flexibly controlled, so that better hydrothermal management design is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cells, and in particular relates to a bipolar plate and a fuel cell stack. Background Art

[0002] The design of the plate in the fuel cell determines the supply of the fuel cell reactant gas (hydrogen and air), thereby affecting the hydrogen-oxygen electrochemical reaction and ultimately affecting the electrical performance of the fuel cell.

[0003] In order to improve the volume power density of fuel cells, bipolar plates are usually used to reduce the overall thickness. Bipolar plates generally include manifold ports, bridge areas, distribution areas, and reaction areas. The layout of the manifold ports determines the starting and ending points of the flow of the reaction gas or coolant, so its layout will greatly affect the design of the distribution area and reaction area, such as the area of ​​the distribution area and reaction area and the outermost contour size of the entire bipolar plate.

[0004] Usually, the inlet and outlet of hydrogen, air and coolant are arranged separately on the bipolar plate, such as Figure 1 Most of the manifold openings in the prior art shown above adopt a "three-in-three-out" arrangement, that is, a hydrogen inlet, an air inlet, a coolant inlet, and three corresponding outlets. Generally, the width of the manifold opening is smaller than the width of the reaction zone, and a distribution zone must be designed between the manifold opening and the reaction zone to ensure the uniformity of the air intake flow between the flow channels in the reaction zone. However, the distribution zone often does not participate in the electrochemical reaction. If the distribution zone area is too large, the reaction zone area ratio will be reduced, which is not conducive to improving the volume power density of the fuel cell. Summary of the invention

[0005] In order to solve the problem in the prior art that the area ratio of the reaction zone cannot be increased due to the arrangement of the distribution area on the bipolar plate, which is not conducive to improving the volume power density of the fuel cell, the present invention provides a fuel cell manifold port arrangement method, which can eliminate the distribution area and greatly increase the area ratio of the reaction zone. At the same time, it can also flexibly control the flow mode of hydrogen and air to achieve better hydrothermal management design.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A bipolar plate comprises: a bipolar plate body and a plurality of air ports, wherein the bipolar plate body comprises two bipolar plate surfaces arranged back to back, the plurality of air ports are arranged on the long side and / or short side of the bipolar plate, and the plurality of air ports comprise a plurality of groups of matching air inlets and air outlets; a line connecting the centers of the two short sides is taken as a first central axis, the first central axis divides the bipolar plate surface into a first reaction zone and a second reaction zone, at least two groups of matching air inlets and air outlets are arranged in the first reaction zone and the second reaction zone, one group of the matching air inlets and air outlets is used for inputting and outputting reaction gas, and the other group of the matching air inlets and air outlets is used for inputting and outputting oxidizing gas.

[0008] In some technical solutions, the line connecting the midpoints of the two long sides is taken as the second central axis, and any group of matching air inlets and air outlets in the first reaction zone and the second reaction zone are respectively arranged on both sides of the second central axis.

[0009] In some technical schemes, four gas ports are provided in the first reaction zone, two of which are arranged on the long sides on both sides of the second central axis, and the other two are respectively arranged on the two short sides; four gas ports are provided in the second reaction zone, two of which are arranged on the long sides on both sides of the second central axis, and the other two are respectively arranged on the two short sides.

[0010] In some technical schemes, the first reaction zone is divided into an X1 reaction half zone and an X2 reaction half zone by the second central axis, and a reaction gas inlet is provided on the long side of the X1 reaction half zone, and an oxidation gas outlet is provided on the short side of the X1 reaction half zone; an oxidation gas inlet is provided on the long side of the X2 reaction half zone, and a reaction gas outlet is provided on the short side of the X2 reaction half zone; the second reaction zone is divided into an X3 reaction half zone and an X4 reaction half zone by the second central axis, and a reaction gas inlet is provided on the long side of the X3 reaction half zone, and an oxidation gas outlet is provided on the short side of the X3 reaction half zone; an oxidation gas inlet is provided on the long side of the X4 reaction half zone, and a reaction gas outlet is provided on the short side of the X4 reaction half zone.

[0011] In some technical schemes, the first reaction zone is divided into an X1 reaction half zone and an X2 reaction half zone by the second central axis, and a reaction gas inlet is provided on the long side of the X1 reaction half zone, and an oxidizing gas outlet is provided on the short side of the X1 reaction half zone; a reaction gas outlet is provided on the long side of the X2 reaction half zone, and an oxidizing gas inlet is provided on the short side of the X2 reaction half zone; the second reaction zone is divided into an X3 reaction half zone and an X4 reaction half zone by the second central axis, and a reaction gas inlet is provided on the long side of the X3 reaction half zone, and an oxidizing gas outlet is provided on the short side of the X3 reaction half zone; a reaction gas outlet is provided on the long side of the X4 reaction half zone, and an oxidizing gas inlet is provided on the short side of the X4 reaction half zone.

[0012] In some technical schemes, the first reaction zone is divided into an X1 reaction half zone and an X2 reaction half zone by the second central axis, and a reaction gas inlet is provided on the long side of the X1 reaction half zone, and an oxidation gas outlet is provided on the short side of the X1 reaction half zone; an oxidation gas inlet is provided on the long side of the X2 reaction half zone, and a reaction gas outlet is provided on the short side of the X2 reaction half zone; the second reaction zone is divided into an X3 reaction half zone and an X4 reaction half zone by the second central axis, and a reaction gas inlet is provided on the long side of the X3 reaction half zone, and an oxidation gas inlet is provided on the short side of the X3 reaction half zone; a reaction gas outlet is provided on the long side of the X4 reaction half zone, and an oxidation gas outlet is provided on the short side of the X4 reaction half zone.

[0013] In some technical solutions, a coolant inlet and a coolant outlet are also provided on the bipolar plate surface, and the coolant inlet and the coolant outlet are respectively arranged on the two long sides; the cross-sectional area of ​​the coolant inlet is the same as the cross-sectional area of ​​the coolant outlet.

[0014] In some technical solutions, the coolant inlet and the coolant outlet are respectively arranged at the midpoints of the two long sides.

[0015] In some technical solutions, the cross-sectional area of ​​the air inlet is the same as the cross-sectional area of ​​the air outlet.

[0016] The present invention also provides an electric stack, comprising a core, a membrane electrode and the above-mentioned bipolar plate, wherein the bipolar plate and the membrane electrode are stacked in sequence to form the core.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the prior art, the manifold ports are often arranged on both sides of the bipolar plate, that is, the inlet / outlet ports of hydrogen, air and coolant are arranged on both sides of the bipolar plate, respectively. Under the condition of ensuring the uniformity of the air intake flow between the flow channels, the area of ​​the distribution area can be reduced as much as possible by optimizing the design of the distribution area, but the distribution area cannot be completely eliminated. The bipolar plate provided by the present invention evenly arranges multiple air inlets and multiple air outlets on the four sides of the bipolar plate, and divides the bipolar plate surface into two reaction zones. Each reaction zone contains at least one set of matching reaction gas inlets and reaction gas outlets and at least one set of oxidation gas inlets and oxidation gas outlets, which optimizes the arrangement of the gas ports, does not require complex gas flow channel design, eliminates the distribution area, greatly increases the area of ​​the reaction zone, and greatly improves the volume power density of the fuel cell;

[0019] 2. The bipolar plate provided by the present invention can flexibly control the flow pattern of hydrogen and air in each reaction zone by changing the matching scheme of the inlet and outlet of the reaction gas and the oxidizing gas in each reaction zone, thereby achieving a better hydrothermal management design. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a structural schematic diagram of a bipolar plate in the prior art;

[0022] Figure 2 A schematic diagram of the structure of the bipolar plate surface provided by the present invention;

[0023] Figure 3 A schematic diagram of the arrangement of gas ports on a bipolar plate surface according to an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of an arrangement of gas ports on a bipolar plate surface according to another embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the arrangement of gas ports on a bipolar plate surface according to another embodiment of the present invention.

[0026] The meanings of the symbols in the accompanying drawings are as follows:

[0027] 1—distribution zone; 2—reaction zone; 3—reaction gas inlet; 4—reaction gas outlet; 5—oxidizing gas inlet; 6—oxidizing gas outlet; 7—cooling liquid inlet; 8—cooling liquid outlet; 9—gas outlet; 10—first reaction zone; 11—second reaction zone; 12—first central axis; 13—second central axis; 14—X1 reaction half zone; 15—X2 reaction half zone; 16—X3 reaction half zone; 17—X4 reaction half zone. DETAILED DESCRIPTION

[0028] The present invention is further explained in detail below in conjunction with the drawings and descriptions of specific embodiments. However, the following descriptions including the embodiments are only used to enable ordinary technicians in the technical field to which the present invention belongs to more clearly understand the principles and essence of the present invention, and do not mean any form of limitation on the present invention.

[0029] Example 1

[0030] like Figure 1 As shown, the existing bipolar plate generally includes a manifold port, a bridge area, a distribution area 1 and a reaction area 2, wherein the manifold port generally includes "three inlets and three outlets", namely, a hydrogen inlet 3, an air inlet 5, a coolant inlet 7 and three corresponding outlets. Since the arrangement of the manifold port determines the starting point and end point of the flow of the reaction gas or coolant, its arrangement will greatly affect the design of the distribution area 1 and the reaction area 2, such as the area of ​​the distribution area 1 and the reaction area 2 and the outermost contour size of the entire bipolar plate. The manifold ports of the traditional solution are often arranged on both sides of the bipolar plate, that is, the inlet and outlet of hydrogen, air and coolant are respectively distributed on both sides of the bipolar plate, and then by optimizing the design of the distribution area 1, such as the lattice design, the differential flow channel design, etc., while ensuring the uniformity of the intake flow between the flow channels, the area of ​​the distribution area 1 is reduced as much as possible, and the distribution area 1 cannot be completely eliminated.

[0031] If the "three-inlet and three-outlet" manifold ports are arranged around the bipolar plate, the distribution area can be eliminated to a certain extent, but this will increase the difficulty of designing the gas flow channel in the reaction area, such as excessive pressure drop or too many design constraints.

[0032] In response to the above problems, the present invention provides a bipolar plate, including a bipolar plate body and a plurality of air ports 9, wherein the bipolar plate body includes two bipolar plate surfaces disposed back to back, and the plurality of air ports 9 are disposed on the long side and / or short side of the bipolar plate, and the plurality of air ports 9 include a plurality of groups of matching air inlets and air outlets.

[0033] The line connecting the centers of the two short sides is the first central axis 12, and the first central axis 12 divides the bipolar plate surface into a first reaction zone 10 and a second reaction zone 11. At least two groups of matching air inlets and air outlets are respectively provided in the first reaction zone 10 and the second reaction zone 11, wherein one group of matching air inlets and air outlets is used for inputting and outputting reaction gas, and the other group of matching air inlets and air outlets is used for inputting and outputting oxidizing gas.

[0034] Preferably, the first reaction zone 10 is provided with 1 reaction gas inlet, 1 reaction gas outlet, 1 oxidation gas inlet and 1 oxidation gas outlet; the second reaction zone 11 is also provided with 1 reaction gas inlet, 1 reaction gas outlet, 1 oxidation gas inlet and 1 oxidation gas outlet.

[0035] The above-mentioned reaction gas is hydrogen, and the oxidizing gas is oxygen.

[0036] In some embodiments, the cross-sectional area of ​​the air inlet is the same as the cross-sectional area of ​​the air outlet to ensure that the pressure and flow rate of the air inlet and the air outlet are the same.

[0037] Furthermore, the cross-sectional shapes of the air inlet and the air outlet are both rectangular, and the length of a side close to the side of the bipolar plate in the rectangular cross-section is less than half the length of the short side.

[0038] Furthermore, the cross-sectional shapes of the air inlet and the air outlet are both circular, and the diameter of the circular cross-section is less than half of the length of the short side.

[0039] In some embodiments, a coolant inlet 7 and a coolant outlet 8 are further provided on the bipolar plate surface, and the coolant inlet 7 and the coolant outlet 8 are respectively arranged on the two long sides.

[0040] Preferably, the coolant inlet 7 and the coolant outlet 8 are respectively arranged at the midpoints of the two long sides.

[0041] More preferably, the cross-sectional areas of the coolant inlet 7 and the coolant outlet 8 are the same.

[0042] It should be noted that the cross-sectional shape of the coolant inlet 7 and the coolant outlet 8 can be rectangular or circular, and the size of the cross-sectional area is determined by the cooling design requirements.

[0043] Based on the problems existing in the arrangement of the bipolar plate manifold ports in the prior art, the present invention evenly arranges multiple gas ports 9 on the four sides of the bipolar plate, that is, multiple groups of gas inlets and gas outlets for inputting and outputting gases, thereby eliminating the distribution area 1. Secondly, considering the difficulty in designing the gas flow channel in the reaction zone 2, the present invention introduces the concept of zoning, dividing the bipolar plate surface into two reaction zones of equal area, each reaction zone including a group of matching reaction gas inlets 3 and reaction gas outlets 4, and a group of matching oxidation gas inlets 5 and oxidation gas outlets 6, further optimizing the arrangement of the manifold ports, greatly increasing the area of ​​the reaction zone, and substantially improving the volume power density of the fuel cell.

[0044] The working principle of fuel cells is to use hydrogen and oxygen to generate electricity in an electrochemical reaction. The core of the fuel cell is the electrolyte membrane, which separates hydrogen and oxygen while allowing protons to pass through. When hydrogen enters the anode, it is broken down into protons and electrons. Protons pass through the electrolyte membrane, while electrons flow through an external circuit to generate current. At the cathode, oxygen combines with protons and electrons to form water and thermal water. Water and heat are closely related and coupled to each other. Therefore, effective water and heat management plays a key role in improving the performance and life of the battery.

[0045] Liquid water and gaseous water are generated during the operation of fuel cells. If there is too much liquid water inside the battery, it will cause the electrodes to be flooded, hindering the normal electrochemical reaction. Too much gaseous water will dilute the concentration of the reaction gas, resulting in insufficient reaction gas at the reaction interface. However, if the water content of the electrolyte membrane is too low, its conductivity will decrease, resulting in an increase in the ohmic voltage loss of the battery. The activity of the catalyst layer interface will also decrease after the membrane loses water.

[0046] If the temperature is too high, the electrolyte membrane will be dehydrated, the stability of the membrane will decrease, and the proton conductivity performance will decrease; if the temperature is too low, hydrogen and air will diffuse into the catalyst layer, the movement of protons from the anode to the cathode will slow down, the internal resistance of the battery will increase, and the battery performance will decrease.

[0047] Based on the above-mentioned hydrothermal management problem, the present invention uses the line connecting the midpoints of the two long sides as the second central axis 13, and any set of matching air inlets and outlets in the first reaction zone 10 and the second reaction zone 11 are respectively arranged on both sides of the second central axis 13. By changing the matching scheme of the inlet / outlet of hydrogen and air in the first reaction zone 10 and the second reaction zone 11, the hydrogen-air flow mode can be flexibly controlled to better achieve hydrothermal management. For example, in terms of water management, setting hydrogen and air to flow in countercurrent can improve the characteristics of dry inlet and wet outlet, that is, using the wetness of the air outlet to improve the dryness of the hydrogen inlet, and using the wetness of the hydrogen outlet to improve the dryness of the air inlet. Similarly, different combinations of hydrogen-air flow modes can also quickly remove the heat generated during the electrochemical reaction from the stack or stabilize the operating temperature of the stack, making the fuel cell operating environment more stable.

[0048] In some embodiments, Figure 2As shown, eight gas ports 9 are provided on the bipolar plate, four gas ports 9 are provided in the first reaction zone 10, two of which are provided on the long sides on both sides of the second central axis 13, and the other two gas ports 9 are provided on the two short sides, respectively, and the four gas ports 9 include one reaction gas inlet, one reaction gas outlet, one oxidation gas inlet and one oxidation gas outlet; four gas ports 9 are also provided in the second reaction zone 11, two of which are provided on the long sides on both sides of the second central axis 13, and the other two gas ports 9 are provided on the two short sides, respectively, and the four gas ports 9 include one reaction gas inlet, one reaction gas outlet, one oxidation gas inlet and one oxidation gas outlet.

[0049] Several embodiments are provided below to illustrate the inlet / outlet matching solutions for achieving different hydrogen-air flow modes.

[0050] Example 2

[0051] Based on Example 1, this example provides a hydrogen-air countercurrent gas port arrangement method on the bipolar plate surface, such as Figure 3 As shown, the first reaction zone 10 is divided into an X1 reaction half zone 14 and an X2 reaction half zone 15 by the second central axis 13, wherein a reaction gas inlet 3 is provided on the long side of the X1 reaction half zone 14, and an oxidizing gas outlet 6 is provided on the short side of the X1 reaction half zone 14; an oxidizing gas inlet 5 is provided on the long side of the X2 reaction half zone 15, and a reaction gas outlet 4 is provided on the short side of the X2 reaction half zone 15.

[0052] The second reaction zone 11 is divided into an X3 reaction half zone 16 and an X4 reaction half zone 17 by the second central axis 13. A reaction gas inlet 3 is provided on the long side of the X3 reaction half zone 16, and an oxidizing gas outlet 6 is provided on the short side of the X3 reaction half zone 16; an oxidizing gas inlet 5 is provided on the long side of the X4 reaction half zone 17, and a reaction gas outlet 4 is provided on the short side of the X4 reaction half zone 17.

[0053] The coolant inlet 7 and the coolant outlet 8 are disposed at the midpoint of the long side in the first reaction zone 10 and at the midpoint of the long side in the second reaction zone 11, respectively.

[0054] Combination Figure 3 As shown, in this embodiment, the flow directions of hydrogen and air in the first reaction zone 10 and the second reaction zone 11 on the bipolar plate surface are opposite.

[0055] Example 3

[0056] Based on Example 1, this example provides another arrangement of hydrogen-air countercurrent gas ports on the bipolar plate surface, such as Figure 4As shown, the first reaction zone 10 is divided into an X1 reaction half zone 14 and an X2 reaction half zone 15 by the second central axis 13, wherein a reaction gas inlet 3 is provided on the long side of the X1 reaction half zone 14, and an oxidizing gas outlet 6 is provided on the short side of the X1 reaction half zone 14; a reaction gas outlet 4 is provided on the long side of the X2 reaction half zone 15, and an oxidizing gas inlet 5 is provided on the short side of the X2 reaction half zone 15.

[0057] The second reaction zone 11 is divided into an X3 reaction half zone 16 and an X4 reaction half zone 17 by the second central axis 13. A reaction gas inlet 3 is provided on the long side of the X3 reaction half zone 16, and an oxidizing gas outlet 6 is provided on the short side of the X3 reaction half zone 16; a reaction gas outlet 4 is provided on the long side of the X4 reaction half zone 17, and an oxidizing gas inlet 5 is provided on the short side of the X4 reaction half zone 17.

[0058] The coolant inlet 7 and the coolant outlet 8 are disposed at the midpoint of the long side in the first reaction zone 10 and at the midpoint of the long side in the second reaction zone 11, respectively.

[0059] Combination Figure 4 It can be seen that the flow directions of hydrogen and air in the first reaction zone 10 and the second reaction zone 11 on the bipolar plate surface in this embodiment are opposite.

[0060] Example 4

[0061] On the basis of Example 1, this example provides a gas port arrangement method for a bipolar plate, which can enable hydrogen-air cocurrent flow and hydrogen-air countercurrent flow in two reaction zones respectively.

[0062] like Figure 5 As shown, the first reaction zone 10 is divided into an X1 reaction half zone 14 and an X2 reaction half zone 15 by the second central axis 13, wherein a reaction gas inlet 3 is provided on the long side of the X1 reaction half zone 14, and an oxidizing gas outlet 6 is provided on the short side of the X1 reaction half zone 14; an oxidizing gas inlet 5 is provided on the long side of the X2 reaction half zone 15, and a reaction gas outlet 4 is provided on the short side of the X2 reaction half zone 15.

[0063] The second reaction zone 11 is divided into an X3 reaction half zone 16 and an X4 reaction half zone 17 by the second central axis 13, wherein a reaction gas inlet 3 is provided on the long side of the X3 reaction half zone 16, and an oxidizing gas inlet 5 is provided on the short side of the X3 reaction half zone 16; a reaction gas outlet 4 is provided on the long side of the X4 reaction half zone 17, and an oxidizing gas outlet 6 is provided on the short side of the X4 reaction half zone 17.

[0064] The coolant inlet 7 and the coolant outlet 8 are disposed at the midpoint of the long side in the first reaction zone 10 and at the midpoint of the long side in the second reaction zone 11, respectively.

[0065] Combination Figure 5 It can be seen that in the first reaction zone 10, hydrogen and air are countercurrent, while in the second reaction zone 11, hydrogen and air are cocurrent.

[0066] It should be noted that the arrangement of the gas ports of the bipolar plate provided by the present invention is not limited to these embodiments.

[0067] Example 5

[0068] The present invention also provides an electric stack, comprising a core, a membrane electrode and the above-mentioned bipolar plate, wherein the bipolar plate and the membrane electrode are stacked in sequence to form the core.

[0069] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A bipolar plate, characterized in that: include: A bipolar plate body and a plurality of gas ports, wherein the bipolar plate body comprises two bipolar plate surfaces disposed opposite to each other, the plurality of gas ports are disposed on the long side and / or the short side of the bipolar plate, and the plurality of gas ports comprise a plurality of groups of matching gas inlets and gas outlets; The line connecting the centers of the two short sides is taken as the first central axis, and the first central axis divides the bipolar plate surface into a first reaction zone and a second reaction zone. At least two groups of matching air inlets and air outlets are provided in the first reaction zone and the second reaction zone, wherein one group of the matching air inlets and air outlets is used for inputting and outputting reaction gas, and the other group of the matching air inlets and air outlets is used for inputting and outputting oxidizing gas.

2. The bipolar plate according to claim 1, characterized in that: The line connecting the midpoints of the two long sides is taken as the second central axis, and any set of matching air inlets and air outlets in the first reaction zone and the second reaction zone are respectively arranged on both sides of the second central axis.

3. The bipolar plate according to claim 2, characterized in that: The first reaction zone is provided with four gas ports, of which two are arranged on the long sides on both sides of the second central axis, and the other two are arranged on the two short sides respectively; The second reaction zone is provided with four gas ports, of which two are arranged on the long sides on both sides of the second central axis, and the other two are arranged on the two short sides respectively.

4. The bipolar plate according to claim 3, characterized in that: The first reaction zone is divided into an X1 reaction half zone and an X2 reaction half zone by the second central axis, a reaction gas inlet is provided on the long side of the X1 reaction half zone, and an oxidation gas outlet is provided on the short side of the X1 reaction half zone; An oxidizing gas inlet is provided on the long side of the X2 reaction half zone, and a reaction gas outlet is provided on the short side of the X2 reaction half zone; The second reaction zone is divided into a X3 reaction half zone and an X4 reaction half zone by the second central axis, a reaction gas inlet is provided on the long side of the X3 reaction half zone, and an oxidation gas outlet is provided on the short side of the X3 reaction half zone; An oxidizing gas inlet is provided on the long side of the X4 reaction half zone, and a reaction gas outlet is provided on the short side of the X4 reaction half zone.

5. The bipolar plate according to claim 3, characterized in that: The first reaction zone is divided into an X1 reaction half zone and an X2 reaction half zone by the second central axis, a reaction gas inlet is provided on the long side of the X1 reaction half zone, and an oxidation gas outlet is provided on the short side of the X1 reaction half zone; A reaction gas outlet is provided on the long side of the X2 reaction half zone, and an oxidation gas inlet is provided on the short side of the X2 reaction half zone; The second reaction zone is divided into a X3 reaction half zone and an X4 reaction half zone by the second central axis, a reaction gas inlet is provided on the long side of the X3 reaction half zone, and an oxidation gas outlet is provided on the short side of the X3 reaction half zone; A reaction gas outlet is provided on the long side of the X4 reaction half zone, and an oxidation gas inlet is provided on the short side of the X4 reaction half zone.

6. The bipolar plate according to claim 3, characterized in that: The first reaction zone is divided into an X1 reaction half zone and an X2 reaction half zone by the second central axis, a reaction gas inlet is provided on the long side of the X1 reaction half zone, and an oxidation gas outlet is provided on the short side of the X1 reaction half zone; An oxidizing gas inlet is provided on the long side of the X2 reaction half zone, and a reaction gas outlet is provided on the short side of the X2 reaction half zone; The second reaction zone is divided into an X3 reaction half zone and an X4 reaction half zone by the second central axis, a reaction gas inlet is provided on the long side of the X3 reaction half zone, and an oxidation gas inlet is provided on the short side of the X3 reaction half zone; A reaction gas outlet is provided on the long side of the X4 reaction half zone, and an oxidation gas outlet is provided on the short side of the X4 reaction half zone.

7. The bipolar plate according to claim 1, characterized in that: The bipolar plate surface is also provided with a coolant inlet and a coolant outlet, and the coolant inlet and the coolant outlet are respectively arranged on the two long sides; The cross-sectional area of ​​the coolant inlet is the same as the cross-sectional area of ​​the coolant outlet.

8. The bipolar plate according to claim 7, characterized in that: The coolant inlet and the coolant outlet are respectively arranged at the midpoints of the two long sides.

9. The bipolar plate according to claim 1, characterized in that: The cross-sectional area of ​​the air inlet is the same as the cross-sectional area of ​​the air outlet.

10. A battery stack, characterized in that: It comprises a core, a membrane electrode and the bipolar plate according to any one of claims 1 to 9, wherein the bipolar plate and the membrane electrode are stacked in sequence to form the core.

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