Bipolar plate, fuel cell, and fuel cell stack

Abstract

The invention discloses a bipolar plate, a single fuel cell and a fuel cell stack. The bipolar plate provided by the embodiment of the invention comprises an anode plate, wherein the anode plate is provided with anode plate distribution holes and an anode flow field region; the anode plate is provided with an anode plate distribution hole and an anode flow field area, the cathode plate is provided with a cathode plate distribution hole and a cathode flow field area, the anode plate is provided with an overflow weir, and the overflow weir on the anode plate is positioned between the anode plate distribution hole and the anode flow field area; the overflow weir on the anode plate is communicated with the glue groove on the anode plate; and / or an overflow weir is arranged on the cathode plate, and the overflow weir on the cathode plate is positioned between the cathode plate distribution hole and the cathode flow field region; and the overflow weir on the negative plate is communicated with the glue groove on the negative plate. According to the bipolar plate, the single fuel cell and the fuel cell stack provided by the embodiment of the invention, the bonding effect is good.

Description

Technical Field

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

[0002] A fuel cell is a device that converts chemical energy directly into electrical energy. Its working principle is different from the traditional combustion process. Instead, it converts the chemical energy of fuel (such as hydrogen) and oxidant (such as oxygen) into electrical energy through electrochemical reactions. This energy conversion method has high efficiency, low emissions and environmental friendliness, so it has received widespread attention in the energy field.

[0003] In the prior art, the mainstream PEM fuel cell (Proton Exchange Membrane Fuel Cell) is a structure in which the membrane electrode and the bipolar plate are separated, that is, the membrane electrode and the bipolar plate are two physically independent sub-parts. In the separated structure, the cathode and anode plates in the bipolar plate assembly are the cathode plate of a certain power generation unit and the anode plate of the adjacent power generation unit, respectively. The bipolar plate, membrane electrode, bipolar plate, membrane electrode, etc. are stacked in bulk in sequence to form a required number of fuel cell stacks to generate electricity. When the fuel cell requires a relatively large power of hundreds of kilowatts, hundreds of plates and membrane electrodes need to be stacked in sequence, which is a lot of work. On the one hand, it is difficult to ensure the consistency of the battery. Once an abnormal cell appears, it may be necessary to remove the membrane electrode and adjacent plates of the abnormal cell at the same time. On the other hand, the assembly time is very long, which brings inconvenience to large-scale mass production.

[0004] Therefore, it is hoped that there will be a new bipolar plate, fuel cell cell and fuel cell stack that can overcome the above problems. Summary of the invention

[0005] In view of the above problems, an object of the present invention is to provide a bipolar plate, a fuel cell and a fuel cell group, in particular, an integrated sealing system for a fuel cell, so as to improve the bonding effect.

[0006] According to one aspect of the present invention, there is provided a bipolar plate, comprising: an anode plate, wherein an anode plate distribution hole and an anode flow field area are provided on the anode plate; and A cathode plate, wherein the cathode plate is provided with a cathode plate distribution hole and a cathode flow field area, Wherein, the anode plate is provided with an overflow weir, the overflow weir on the anode plate is located between the anode plate distribution hole and the anode flow field area; the overflow weir on the anode plate is connected to the glue groove on the anode plate; and / or The cathode plate is provided with an overflow weir, and the overflow weir on the cathode plate is located between the cathode plate distribution hole and the cathode flow field area; the overflow weir on the cathode plate is connected to the glue groove on the cathode plate.

[0007] Optionally, there are multiple overflow weirs; The width of the overflow weir is between 0.1 mm and 3 mm; The distance between adjacent overflow weirs is between 0.1 mm and 3 mm.

[0008] Optionally, at least one supporting rib is provided in the glue groove, and the supporting rib is used to divide the glue groove; The width of the supporting ribs is between 0.5 mm and 3 mm.

[0009] Optionally, the anode plate distribution holes include at least one selected from fuel gas distribution holes, oxidizing gas distribution holes and cooling fluid distribution holes; and / or The cathode plate distribution holes include at least one selected from fuel gas distribution holes, oxidizing gas distribution holes and cooling fluid distribution holes, Wherein, support ribs are arranged at the fuel gas distribution holes and / or the oxidation gas distribution holes and / or the cooling fluid distribution holes.

[0010] Optionally, the width of the supporting ribs is between one twentieth and one fifth of the width of the fuel gas distribution hole; and / or The width of the supporting ribs is between one twentieth and one fifth of the width of the oxidizing gas distribution holes; and / or The width of the supporting ribs is between one twentieth and one fifth of the width of the cooling fluid distribution holes.

[0011] According to another aspect of the present invention, there is provided a fuel cell unit cell, comprising: A bipolar plate as previously described; and The membrane electrode is located between the anode plate and the cathode plate.

[0012] Optionally, a bonding glue is provided in the glue groove on the anode plate to bond the anode plate and the membrane electrode; at least a portion of the bonding glue is bonded to the membrane electrode via the overflow weir on the anode plate; and / or Adhesive glue is arranged in the glue groove on the cathode plate to bond the cathode plate and the membrane electrode; at least a part of the adhesive glue is bonded to the membrane electrode via the overflow weir on the cathode plate.

[0013] Optionally, the membrane electrode comprises: Catalyst coated membranes; Carbon paper; and frame, Wherein, the frame includes a plurality of stacked sub-frames; Different sub-frames have different thicknesses; and / or Different sub-frames have different hardnesses.

[0014] Optionally, the plurality of sub-frames include a first sub-frame and a second sub-frame; The first sub-frame is arranged on one side of the catalyst coating membrane; The second sub-frame is arranged on one side of the first sub-frame, and the first sub-frame is between the catalyst coating film and the second sub-frame. Among them, the hardness coefficient of the first sub-frame is lower than the hardness coefficient of the second sub-frame; and / or the thickness of the first sub-frame is smaller than the thickness of the second sub-frame.

[0015] According to another aspect of the present invention, there is provided a fuel cell stack, comprising: A plurality of stacked single cells each comprises the anode plate as described above, the cathode plate as described above, and a membrane electrode sandwiched therebetween.

[0016] The bipolar plate, fuel cell cell and fuel cell group provided by the embodiments of the present invention are provided with an overflow weir connected to the glue groove on the polar plate, and the overflow weir can overflow the glue to improve the uniformity of the glue in the glue groove, thereby improving the bonding effect.

[0017] Furthermore, a plurality of overflow weirs are provided between the electrode plate distribution holes and the flow field interval, thereby increasing the uniformity of the glue in the glue groove, greatly increasing the adhesion between the electrode plate and the membrane electrode, and improving the sealing effect.

[0018] Furthermore, supporting ribs are provided in the glue groove of the electrode plate to divide the single glue groove into multiple glue grooves, thereby improving the sealing performance between the electrode plate and the membrane electrode.

[0019] Furthermore, a supporting rib is provided at the electrode plate distribution hole, and the width of the supporting rib is 1 / 5-1 / 20 of the width of the electrode plate distribution hole, thereby ensuring the flow guiding effect while playing a supporting role.

[0020] Furthermore, the frame of the membrane electrode is a composite frame composed of multiple layers of frame materials with different thicknesses or hardnesses, thereby increasing the sealing between the CCM and the frame while reducing mechanical damage to the CCM.

[0021] Furthermore, the frame of the membrane electrode is composed of a composite of multiple layers of frame materials. The inner layer that is bonded to the CCM is a frame material with a low hardness coefficient and a thin thickness, and the outer layer frame is a frame material with a high hardness coefficient and a thick thickness, which increases the support and strength of the membrane electrode frame while ensuring the sealing of the CCM.

[0022] Furthermore, the cooling surface rubber pad is provided with a rubber line, thereby enhancing the sealing between the single cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0024] Figure 1 An exploded schematic diagram of a fuel cell cell according to an embodiment of the present invention is shown;

[0025] Figure 2 A schematic structural diagram of a cooling surface rubber pad of a fuel cell cell according to an embodiment of the present invention is shown;

[0026] Figure 3 A schematic structural diagram of an anode plate cooling surface according to an embodiment of the present invention is shown;

[0027] Figure 4 A schematic structural diagram of the anode surface of an anode plate according to an embodiment of the present invention is shown;

[0028] Figure 5 A schematic diagram of the structure of a membrane electrode according to an embodiment of the present invention is shown;

[0029] Figure 6 A schematic diagram of the structure of the cathode surface according to an embodiment of the present invention is shown;

[0030] Figure 7 A schematic diagram of a cooling surface rubber pad according to an embodiment of the present invention is shown;

[0031] Figure 8 A schematic diagram of the marking of the anode surface of an anode plate according to an embodiment of the present invention is shown;

[0032] Fig. 9 shows a schematic diagram of the annotated cooling surface of an anode plate according to an embodiment of the present invention;

[0033] Fig.10 A schematic structural diagram of a membrane electrode composite frame according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0034] Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, identical elements are represented by identical or similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale. In addition, some well-known parts may not be shown in the drawings.

[0035] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. Many specific details of the present invention, such as the structure, materials, dimensions, processing technology and techniques of the components are described below to provide a clearer understanding of the present invention. However, as those skilled in the art will appreciate, the present invention may be implemented without following these specific details.

[0036] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0037] According to one aspect of the present invention, a bipolar plate is provided. The bipolar plate includes an anode plate and a cathode plate. The anode plate is provided with an anode plate distribution hole and an anode flow field area. The cathode plate is provided with a cathode plate distribution hole and a cathode flow field area. For example, an overflow weir is provided on the anode plate, and the overflow weir on the anode plate is located between the anode plate distribution hole and the anode flow field area. The overflow weir on the anode plate is connected to the glue groove on the anode plate. For example, an overflow weir is provided on the cathode plate, and the overflow weir on the cathode plate is located between the cathode plate distribution hole and the cathode flow field area. The overflow weir on the cathode plate is connected to the glue groove on the cathode plate. Optionally, a bipolar plate includes an anode plate and a cathode plate connected to the anode plate; the anode plate and the cathode plate of the bipolar plate are respectively the anode plate of a certain power generation unit and the cathode plate of an adjacent power generation unit. Optionally, the anode plate and the cathode plate on a bipolar plate are integrally formed. Optionally, the structural parts not mentioned in the above bipolar plate can adopt the same or similar design as the prior art.

[0038] According to the bipolar plate of the embodiment of the present invention, an overflow weir is provided in the glue groove on the anode plate / cathode plate, and the overflow weir can overflow the glue to improve the uniformity of the glue (in the glue groove).

[0039] According to another aspect of the present invention, a fuel cell is provided. The fuel cell comprises the bipolar plate as described above and a membrane electrode between the anode plate and the cathode plate. The structural parts not mentioned in the following fuel cell may adopt the same or similar design as the prior art.

[0040] Figure 1 FIG. 1 shows an exploded schematic diagram of a fuel cell cell according to an embodiment of the present invention. Further, Figure 2 A schematic structural diagram of a cooling surface rubber pad of a fuel cell cell according to an embodiment of the present invention is shown; Figure 3 A schematic structural diagram of an anode plate cooling surface according to an embodiment of the present invention is shown; Figure 4A schematic structural diagram of the anode surface of an anode plate according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the structure of a membrane electrode according to an embodiment of the present invention is shown; Figure 6 A schematic structural diagram of a cathode surface according to an embodiment of the present invention is shown.

[0041] Combination Figures 1 to 6 As shown, the bipolar plate and the fuel cell cell of the embodiment of the present invention are further described. Figure 1 As shown, a fuel cell cell according to an embodiment of the present invention includes an (anode plate) cooling surface rubber pad (water rubber pad) 10, an anode plate cooling surface 20, an anode plate anode surface 30, a membrane electrode 40, and a cathode surface 50. Figures 2 to 6 The structural schematic diagrams of the above-mentioned components are shown respectively.

[0042] Figure 7 A labeled schematic diagram of a cooling surface rubber pad according to an embodiment of the present invention is shown. Figure 8 A schematic diagram of the marking of the anode surface of the anode plate according to an embodiment of the present invention is shown. Fig. 9 FIG. 2 shows a schematic diagram of the cooling surface of the anode plate according to an embodiment of the present invention. Figures 7 to 9 , the bipolar plate and fuel cell of the embodiment of the present invention are further described.

[0043] like Figure 7 As shown, a rubber pad plane 11 and a rubber line 12 are provided on the (anode plate) cooling surface rubber pad (water rubber pad) 10. The specific value of the total width D1 of the rubber pad can be set according to actual needs.

[0044] like Figure 8 As shown, the anode plate (anode surface 30 of the anode plate) is provided with an anode plate distribution hole and an anode flow field area 36. The overflow weir 33 provided on the anode plate is located between the anode plate distribution hole and the anode plate flow field area 36, ​​and the overflow groove 33 on the anode plate is connected to the glue groove 31 on the anode plate. The anode plate distribution hole includes at least one selected from the fuel gas distribution hole 35, the oxidation gas distribution hole 32 and the cooling fluid distribution hole 34 (the types included in the anode plate distribution hole are also applicable to the cathode plate distribution hole). There are multiple overflow weirs 33 on the anode plate. The width D3 of the overflow weir 33 is between 0.1mm and 3mm. The spacing S between adjacent overflow weirs 33 is between 0.1mm and 3mm. The length D2 of the overflow weir can be set according to actual needs. The size parameters, position distribution, etc. of the overflow weir 33 on the anode plate are also applicable to the overflow weir on the cathode plate.

[0045] like Fig. 9As shown, a glue groove (cooling surface glue groove 24) is provided on the anode plate (anode plate cooling surface 20). At least one supporting rib is provided in the glue groove, and the supporting rib is used to divide the glue groove. The width D4 of the supporting rib is between 0.5 mm and 3 mm. Optionally, the supporting rib includes a first (center) supporting rib 21 and a second (non-center) supporting rib 23. The size parameters, position distribution, etc. of the supporting rib on the anode plate are also applicable to the supporting rib on the cathode plate.

[0046] Combination Figure 8 and Fig. 9 As shown, the fuel gas distribution hole 35 and / or the oxidation gas distribution hole 32 and / or the cooling fluid distribution hole 34 are provided with support ribs. The width of the support ribs is between one twentieth and one fifth of the width of the fuel gas distribution hole 35; and / or the width of the support ribs is between one twentieth and one fifth of the width of the oxidation gas distribution hole 32; and / or the width of the support ribs is between one twentieth and one fifth of the width of the cooling fluid distribution hole 34. The number, position, size, etc. of the support ribs are set so that they can play a supporting role without affecting the flow diversion (of the guide groove 22 to the cooling flow field area 25). The size parameters, number, position distribution, etc. of the support ribs on the anode plate are also applicable to the support ribs on the cathode plate.

[0047] In an optional embodiment of the present invention, adhesive glue is provided in the adhesive groove on the anode plate to bond the anode plate and the membrane electrode; at least a portion of the adhesive glue is bonded to the membrane electrode via the overflow weir on the anode plate. And / or adhesive glue is provided in the adhesive groove on the cathode plate to bond the cathode plate and the membrane electrode; at least a portion of the adhesive glue is bonded to the membrane electrode via the overflow weir on the cathode plate.

[0048] In an optional embodiment of the present invention, the membrane electrode comprises a catalyst coated membrane, carbon paper and a frame. The frame may include a plurality of sub-frames, different sub-frames having different thicknesses and / or different sub-frames having different hardnesses. Optionally, the plurality of sub-frames include a first sub-frame and a second sub-frame. The first sub-frame is disposed on one side of the catalyst coated membrane. The second sub-frame is disposed on one side of the first sub-frame, and the first sub-frame is between the catalyst coated membrane and the second sub-frame. The hardness coefficient of the first sub-frame is lower than the hardness coefficient of the second sub-frame; and / or the thickness of the first sub-frame is less than the thickness of the second sub-frame. Optionally, a catalyst is coated on a proton exchange membrane by direct spraying to form a CCM (catalyst coated membrane), and the CCM and the carbon paper diffusion layer form a membrane electrode for a (proton exchange membrane) fuel cell.

[0049] Fig.10 FIG. 1 shows a schematic diagram of the structure of a membrane electrode composite frame according to an embodiment of the present invention. Fig.10As shown, the membrane electrode according to an embodiment of the present invention includes a first frame 41 (which can be regarded as the second sub-frame described above), a second frame 42 (which can be regarded as the first sub-frame described above), CCM43, a fourth frame 44 (which can be regarded as the first sub-frame described above) and a fifth frame 45 (which can be regarded as the second sub-frame described above).

[0050] Specifically, a second frame 42 and a fourth frame 44 are respectively provided on both sides of the CCM 43. A first frame 41 is provided on the side of the second frame 42 away from the CCM 43. A fifth frame 45 is provided on the side of the fourth frame 44 away from the CCM 43. The first frame 41, the second frame 42, the fourth frame 44 and the fifth frame 45 are, for example, polyethylene naphthalate (PEN) frames, and of course, other materials can also be used.

[0051] In this application, the membrane electrode frame adopts a composite frame (composed of multiple layers of frame materials with different thicknesses or hardnesses). The hardness and thickness of frame materials with different numbers of layers are different, thereby increasing the sealing between the CCM and the frame material and reducing the mechanical damage of the CCM.

[0052] Optionally, in order to increase the support and strength of the membrane electrode (MEA) frame and ensure the sealing of the CCM, the MEA frame is composed of a composite of multiple frame materials, and the number of composite layers is preferably 2-6. The hardness and thickness of frame materials with different numbers of layers are different. The two inner layers that are bonded to the CCM are preferably frame materials with low hardness coefficient and thin thickness to ensure the sealing of the CCM; the outer frame material can be selected from a frame material with high hardness coefficient and thick thickness to increase the strength and support of the MEA frame. The frame material can be selected from one or more of polyimide (PI), polyphenylene sulfide (PPS) or polynaphthyl ester (PEN) membranes.

[0053] Furthermore, the anode plate, MEA (CCM+carbon paper+frame), cathode plate and cooling surface sealing pad of the fuel cell cell are sealed by an integrated sealing process. The MEA, the anode plate and the cathode plate are bonded or hot pressed to form an integrated single cell. The bonding glue can be one or more of silicone rubber, fluororubber or ethylene propylene diene monomer (EPDM).

[0054] In an optional embodiment of the present invention, an overflow groove is arranged between the distribution hole of the (cathode / anode) plate of the fuel cell and the flow field area, and the membrane electrode frame adopts a composite frame. A support rib can be arranged in the (cathode / anode) plate glue groove to divide a single glue groove into multiple glue grooves, the width of the support rib is set to 0.5-3mm, the number can be set to 1-5, preferably 1-3, and the corresponding glue groove is divided into 2-6, preferably 2-4. The above arrangement improves the sealing performance of the anode plate, cathode plate and MEA frame material.

[0055] Overflow weirs are provided between the (cathode / anode) plate distribution holes and the flow field interval, and the spacing between adjacent overflow weirs (overflow holes) is 0.1-3 mm, preferably 0.5-1.5 mm. The width of the overflow weir is 0.1-3 mm, preferably 0.5-1 mm, to ensure that the overflow weir can overflow the glue, thereby ensuring the uniformity of the glue and increasing the adhesion to the MEA frame.

[0056] Support ribs can be set at the fuel gas, oxidizing gas and cooling fluid distribution holes. The number of support ribs can be set to 1-4, and the width of the support ribs is 1 / 5-1 / 20 of the width of the distribution hole, so as to play a supporting role without affecting the diversion.

[0057] According to another aspect of the present invention, a fuel cell stack is provided. The fuel cell stack includes a plurality of stacked cells. The plurality of cells respectively include an anode plate as described above, a cathode plate as described above, and a membrane electrode sandwiched between the anode plate and the cathode plate.

[0058] Optionally, the sealing between the cells can be in the form of an active elastic sealing pad or a rubber ring. Optionally, the cooling surface pad can be provided with a rubber line, and the number of the rubber lines can be set to 1-3, thereby enhancing the sealing between the cells. The cooling surface sealing pad of the cell can be made of one or more of silicone rubber, fluororubber or ethylene propylene diene monomer (EPDM).

[0059] In a specific embodiment of the present application, a fuel cell includes a first end plate and a second end plate opposite to each other, and a first insulating plate, a first current collector, a repeating part, a second current collector, and a second insulating plate are stacked in sequence between the two. The first end plate also serves as a flow distribution device for distributing fuel fluid, oxidizing gas, and cooling medium to the bipolar plates in the repeating part. The repeating part includes a plurality of fuel cell cells as described above.

[0060] The fuel fluid includes gaseous hydrogen, or liquid methanol or methanol solution and other fuel composition fluids. The oxidizing gas can be air or pure oxygen, and the cooling medium can be liquid or gas.

[0061] The repeating component includes the bipolar plate as described above and the membrane electrode (assembly) sandwiched between the bipolar plates. The bipolar plate includes an anode plate and a cathode plate and a cooling layer sandwiched between the anode plate and the cathode plate. The repeating component is generally rectangular in a plane perpendicular to the stacking direction, and a first group of main pipes, a second group of main pipes and a third group of main pipes extending along the stacking direction are provided on the side portions of the rectangle, for respectively providing fuel fluid, oxidizing gas and cooling medium to corresponding flow fields in the bipolar plate.

[0062] A cell stack of a fuel cell, for example, includes a plurality of repeated components stacked together and electrically connected to each other to increase output voltage.

[0063] The first current collector contacts the anode plate of the repeating component, and both are composed of conductive materials, thereby forming a conductive path on the anode side. The second current collector contacts the cathode plate of the repeating component, and both are composed of conductive materials, thereby forming a conductive path on the cathode side. The first current collector and the second current collector can be made of highly conductive materials such as copper plates and aluminum. In this embodiment, the anode plate and the cathode plate of the repeating component have the functions of reactant flow field device, heat sink, conduction, and support structure, thereby simplifying the structure of the fuel cell and reducing the volume of the fuel cell.

[0064] The first insulating plate is located between the first current collector and the first end plate, and the second insulating plate is located between the second current collector and the second end plate, thereby isolating the repeating component and the current collector from the first end plate and the second end plate. In the case where the fuel cell stack includes a plurality of repeating components, the plurality of repeating components are stacked between the first current collector and the second current collector. The side portions of the first insulating plate and the first current collector are respectively formed with a plurality of through holes, which are respectively aligned with the plurality of through holes of the side portions of the repeating component, thereby forming a plurality of main passages extending along the stacking direction, for example, a first group of main passages for inflow and outflow of fuel fluid, a second group of main passages for inflow and outflow of oxidizing gas, and a third group of main passages for inflow and outflow of cooling medium.

[0065] The fuel cell stack further includes two tension plates that form a clamping device with the first end plate and the second end plate. The two tension plates are located on opposite sides of the fuel cell stack and include a lower flange and an upper flange, respectively. The lower flange contacts the bottom edge of the first end plate, and the upper flange contacts the top edge of the second end plate, thereby forming a clamping device, and the upper and lower flanges of the tension plate are used to apply pressure to the first end plate and the second end plate to fix the first insulating plate, the first current collector, the repeating component, the second current collector, and the second insulating plate together. Preferably, the upper and lower flanges of the tension plate have a plurality of screw holes, and bolts passing through the plurality of screw holes are used to apply additional pressure to the surface of the second end plate. Preferably, a sealing frame is provided between each stacked layer, so as to form a seal between each stacked layer while fixing each stacked layer.

[0066] In this embodiment, the first end plate also serves as a flow distribution device. A first pair of manifolds for providing inflow and outflow channels for fuel fluid, a second pair of manifolds for providing inflow and outflow channels for oxidizing gas, and a third pair of manifolds for providing inflow and outflow channels for cooling medium are formed in the first end plate. When the first end plate and the second end plate are fixed together, the top open ends of the first pair of manifolds in the first end plate are aligned with the first group of main pipes in the membrane electrode assembly in the repeating component, the top open ends of the second pair of manifolds in the first end plate are aligned with the second group of main pipes in the membrane electrode assembly in the repeating component, and the top open ends of the third pair of manifolds in the first end plate are aligned with the third group of main pipes in the membrane electrode assembly in the repeating component. The side open ends of the first pair of manifolds, the second pair of manifolds, and the third pair of manifolds are formed on the end surface of the first end plate.

[0067] The present invention provides a single-cell integrated sealing system, which improves the reliability and service life of the fuel cell system, reduces the leakage risk of the fuel cell single cell and the entire fuel cell stack; and reduces the difficulty of assembling the fuel cell stack, improves the consistency of the single cell, and improves the production efficiency; the process is simple and highly operable, and is suitable for large-scale mass production.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0069] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A bipolar plate, comprising: An anode plate, wherein the anode plate is provided with an anode plate distribution hole and an anode flow field area; as well as A cathode plate, wherein the cathode plate is provided with a cathode plate distribution hole and a cathode flow field area, Wherein, the anode plate is provided with an overflow weir, the overflow weir on the anode plate is located between the anode plate distribution hole and the anode flow field area; the overflow weir on the anode plate is connected to the glue groove on the anode plate; and / or The cathode plate is provided with an overflow weir, and the overflow weir on the cathode plate is located between the cathode plate distribution hole and the cathode flow field area; the overflow weir on the cathode plate is connected to the glue groove on the cathode plate.

2. The bipolar plate according to claim 1, wherein: There are multiple overflow weirs; The width of the overflow weir is between 0.1 mm and 3 mm; The distance between adjacent overflow weirs is between 0.1 mm and 3 mm.

3. The bipolar plate according to claim 1, wherein: At least one supporting rib is provided in the glue groove, and the supporting rib is used to divide the glue groove; The width of the supporting ribs is between 0.5 mm and 3 mm.

4. The bipolar plate according to claim 1, wherein: The anode plate distribution holes include at least one selected from fuel gas distribution holes, oxidizing gas distribution holes and cooling fluid distribution holes; and / or The cathode plate distribution holes include at least one selected from fuel gas distribution holes, oxidizing gas distribution holes and cooling fluid distribution holes, Wherein, support ribs are arranged at the fuel gas distribution holes and / or the oxidation gas distribution holes and / or the cooling fluid distribution holes.

5. The bipolar plate according to claim 4, wherein: The width of the supporting ribs is between one twentieth and one fifth of the width of the fuel gas distribution holes; and / or The width of the supporting ribs is between one twentieth and one fifth of the width of the oxidizing gas distribution holes; and / or The width of the supporting ribs is between one twentieth and one fifth of the width of the cooling fluid distribution holes.

6. A fuel cell cell, comprising: The bipolar plate according to any one of claims 1 to 5; as well as The membrane electrode is located between the anode plate and the cathode plate.

7. The fuel cell according to claim 6, wherein: The adhesive groove on the anode plate is provided with adhesive for bonding the anode plate and the membrane electrode; at least a portion of the adhesive is bonded to the membrane electrode via the overflow weir on the anode plate; and / or Adhesive glue is arranged in the glue groove on the cathode plate to bond the cathode plate and the membrane electrode; at least a part of the adhesive glue is bonded to the membrane electrode via the overflow weir on the cathode plate.

8. The fuel cell according to claim 6, wherein: The membrane electrode comprises: Catalyst coated membranes; Carbon paper; and frame, Wherein, the frame includes a plurality of stacked sub-frames; Different sub-frames have different thicknesses; and / or Different sub-frames have different hardnesses.

9. The fuel cell according to claim 8, wherein: The multiple sub-frames include a first sub-frame and a second sub-frame; The first sub-frame is arranged on one side of the catalyst coating membrane; The second sub-frame is arranged on one side of the first sub-frame, and the first sub-frame is between the catalyst coating film and the second sub-frame. Among them, the hardness coefficient of the first sub-frame is lower than the hardness coefficient of the second sub-frame; and / or the thickness of the first sub-frame is smaller than the thickness of the second sub-frame.

10. A fuel cell stack, comprising: A plurality of stacked single cells, each of which comprises an anode plate according to any one of claims 1 to 5, a cathode plate according to any one of claims 1 to 5, and a membrane electrode sandwiched therebetween.

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