Fuel cell sealing polar plate and fuel cell

Abstract

The utility model provides a fuel cell sealing polar plate and a fuel cell. The fuel cell sealing polar plate comprises a fuel cell polar plate, a sealing gasket and an adhesive limiting body, a sealing groove and a first limiting groove are formed in the fuel cell polar plate; the first limiting groove is formed below the sealing groove and is communicated with the sealing groove; the sealing gasket is arranged in the sealing groove, a second limiting groove aligned with the first limiting groove is formed in the surface, close to the groove bottom wall of the sealing groove, of the sealing gasket, and the first limiting groove and the second limiting groove are filled with the adhesive limiting body. Through the bonding and limiting effects of the adhesive limiting body, the sealing gasket is not prone to lateral displacement even if the sealing gasket operates in a high-pressure gas environment, and the sealing reliability is good. And the sealing gasket and the sealing groove are difficult to separate, so that the sealing durability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a fuel cell sealing plate and a fuel cell. Background Art

[0002] A fuel cell is a device that uses a fuel and an oxidant to directly convert chemical energy into electrical energy. The proton exchange membrane fuel cell (PEMFC) is a common type of fuel cell. It offers advantages such as low operating temperature, fast startup, high specific power, simple structure, and easy operation. It has enormous potential for application in new energy vehicles, stationary power plants, aviation, and shipping.

[0003] Proton exchange membrane fuel cells typically use a gas such as hydrogen as fuel and a gas such as air or oxygen as an oxidant. Proton exchange membrane fuel cells typically include bipolar plates, membrane electrodes, current collecting plates, end plates, seals, and fasteners. Sealing performance is one of the most important factors in ensuring the reliability and safety of fuel cells. In some confined spaces, such as aviation and underwater applications, fuel cells have high sealing requirements to ensure that the fuel cell does not flow through the sealing parts to the outside of the fuel cell, causing the hydrogen concentration in the confined space to be too high, so as to ensure the reliability and safety of the fuel cell.

[0004] Conventional fuel cells usually have a sealing gasket structure arranged in a sealing groove, and the sealing gasket abuts or adheres to the bottom of the sealing groove to achieve sealing. This sealing method has at least the following disadvantages: before the glue cures and after the sealing gasket is attached to the sealing groove, it is easy to shift, resulting in the formation of micro gas channels between the sealing gasket and the sealing groove, that is, the sealing effect is poor, and the high-pressure gas is easy to leak gradually. In addition, after the sealing gasket has been running for a long time in a high-temperature, high-pressure, acidic and oxidizing working environment, the sealing gasket is easy to separate from the sealing groove, causing the sealing gasket to fall off, affecting the sealing performance, that is, the sealing durability is poor. In addition, when a higher-pressure gas is introduced, the sealing gasket is also prone to lateral displacement due to the pressure difference, resulting in a problem of poor sealing reliability. Utility Model Content

[0005] Based on this, it is necessary to address the problems in the above background technology and provide a fuel cell sealing plate that can improve the sealing effect, sealing durability and sealing reliability of the sealing gasket.

[0006] To solve the above technical problems, in a first aspect, the present disclosure provides a fuel cell sealing plate, which includes a fuel cell plate, a sealing gasket and an adhesive limiter;

[0007] The fuel cell plate is provided with a sealing groove and a first limiting groove, wherein the first limiting groove is provided below the sealing groove and communicates with the sealing groove;

[0008] The sealing gasket is arranged in the sealing groove, and a second limiting groove aligned with the first limiting groove is provided on the surface of the sealing gasket close to the bottom wall of the sealing groove, and the adhesive limiting body is filled in the first limiting groove and the second limiting groove.

[0009] In some embodiments of the present disclosure, a plurality of first limiting grooves are provided on the fuel cell plate, and a plurality of second limiting grooves are correspondingly provided on the surface of the sealing gasket close to the bottom wall of the sealing groove.

[0010] In some embodiments of the present disclosure, the number of the first limiting grooves is 1 to 10.

[0011] In some embodiments of the present disclosure, an extension direction of each of the first limiting grooves intersects with a width direction of the sealing groove, and a plurality of the first limiting grooves are spaced apart and arranged in sequence in the width direction of the sealing groove.

[0012] In some embodiments of the present disclosure, the cross-sectional area of ​​the first limiting groove in its depth direction is 0.4 mm 2 ~5mm 2 and / or,

[0013] The cross-sectional area of ​​the second limiting groove in its depth direction is 0.4 mm 2 ~5mm 2 .

[0014] In some embodiments of the present disclosure, the radial dimension of the first limiting groove gradually shrinks along the direction from the notch of the first limiting groove toward the bottom wall thereof; or,

[0015] Along the direction from the notch of the first limiting groove toward the bottom wall thereof, the radial dimension of the first limiting groove remains unchanged.

[0016] In some embodiments of the present disclosure, the orthographic projection of the notch of the second limiting groove on the notch of the first limiting groove coincides with the notch of the first limiting groove.

[0017] In some embodiments of the present disclosure, the sealing gasket is a rubber sealing gasket; and / or,

[0018] The adhesive limiter is a solid structure formed after the glue is cured.

[0019] In some embodiments of the present disclosure, the adhesive limiter is further extended between the sealing gasket and the bottom wall of the sealing groove.

[0020] In a second aspect, the present disclosure also provides a fuel cell, which includes a plurality of fuel cell sealing plates as described in any of the above embodiments, or the fuel cell includes a plurality of fuel cell sealing plates prepared by the preparation method as described in any of the above embodiments, and the plurality of fuel cell sealing plates are arranged in parallel in sequence, and the sealing between two adjacent fuel cell sealing plates is achieved by the sealing gasket.

[0021] The fuel cell sealing plate in at least one of the above-mentioned embodiments includes a fuel cell plate, a sealing gasket and an adhesive limiter. Among them, a first limiter groove is further provided in the sealing groove of the fuel cell plate, and a second limiter groove is provided on the surface of the sealing gasket, and the first limiter groove and the second limiter groove are filled with an adhesive limiter. The adhesive limiter has both bonding and limiting functions, and the two functions cooperate with each other and synergize to significantly improve the sealing effect of the sealing gasket. On the one hand, the adhesive limiter allows the sealing gasket to be bonded to the sealing groove in a non-planar manner, with a large contact area and high bonding strength. It is not easy to shift after bonding, which can reduce the generation of micro gas channels, thereby obtaining a better sealing effect. Moreover, through the bonding and limiting effects of the adhesive limiter, the sealing gasket is not easy to shift laterally even when operating in a gas environment with a higher pressure, and the sealing reliability is better. The sealing gasket is also difficult to separate from the sealing groove, and has good sealing durability.

[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0024] Figure 1 This is a schematic structural diagram of a fuel cell sealing plate;

[0025] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the sealing groove of the fuel cell sealing plate

[0026] Figure 3 for Figure 2 Schematic diagram of the split structure of the structure shown;

[0027] Figure 4is a schematic cross-sectional structural diagram of a sealing groove of a fuel cell sealing plate in another embodiment;

[0028] Figure 5 is a schematic cross-sectional structural diagram of a sealing groove of a fuel cell sealing plate in another embodiment;

[0029] Figure 6 is a schematic cross-sectional structural diagram of a sealing groove of a fuel cell sealing plate in another embodiment;

[0030] Figure 7 is a schematic cross-sectional structural diagram of a sealing groove of a fuel cell sealing plate in another embodiment;

[0031] Figure 8 A schematic diagram of the steps of a method for preparing a sealed plate for a fuel cell;

[0032] Figure 9 Schematic diagram of the cross-sectional structure of a fuel cell plate provided with a sealing groove and a first limiting groove;

[0033] Figure 10 For Figure 9 Schematic diagram of the cross-sectional structure filled with limiting glue based on the structure shown.

[0034] The reference numerals and their meanings are as follows:

[0035] 110. Fuel cell plate; 111. Sealing groove; 112. First limiting groove; 113. Anode side surface; 114. Cathode side surface; 115. Fuel channel; 116. Oxidant channel; 117. Coolant channel; 120. Sealing gasket; 121. Second limiting groove; 130. Adhesive limiting body. DETAILED DESCRIPTION

[0036] To facilitate understanding of this document, a more comprehensive description of this document is provided below. Preferred embodiments of this document are provided herein. However, this document can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present document.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this document pertains. The terms used herein in the specification are for the purpose of describing specific embodiments only and are not intended to limit this document.

[0038] It should be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" another element or layer, it can be directly on, adjacent to, connected to, or coupled to the other element or layer, or there can be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there can be no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion.

[0039] Spatially relative terms such as "under," "beneath," "beneath," "under," "over," "above," and the like, may be used herein for convenience of description to describe the relationship of one element or feature to other elements or features. It should be understood that the spatially relative terms are intended to also encompass different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, then elements or features described as "under" or "beneath" or "beneath" the other elements would be oriented "over" the other elements or features. Thus, the exemplary terms "under" and "under" may encompass both the above and below orientations. The device may be otherwise oriented (e.g., rotated 90 degrees or in other orientations) and the spatial descriptors used interpreted accordingly.

[0040] The purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present disclosure. When used herein, the singular forms "a," "an," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "including," when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0041] The present disclosure provides a fuel cell sealing plate, comprising a fuel cell plate, a sealing gasket, and an adhesive stopper. The fuel cell plate is provided with a sealing groove and a first stopper groove, the first stopper groove being disposed below and communicating with the sealing groove. The sealing gasket is disposed in the sealing groove, and a second stopper groove is disposed on a surface of the sealing gasket near the bottom wall of the sealing groove, aligned with the first stopper groove. The adhesive stopper fills the first and second stopper grooves.

[0042] The fuel cell sealing plate includes a fuel cell plate, a sealing gasket and an adhesive limiter. Among them, a first limit groove is further provided in the sealing groove of the fuel cell plate, and a second limit groove is provided on the surface of the sealing gasket, and the first limit groove and the second limit groove are filled with an adhesive limiter. The adhesive limiter has both bonding and limiting functions, and the two functions cooperate with each other and synergize to significantly improve the sealing effect of the sealing gasket. On the one hand, the adhesive limiter allows the sealing gasket to be bonded to the sealing groove in a non-planar manner, with a large contact area and high bonding strength. It is not easy to shift after bonding, which can reduce the generation of micro gas channels, thereby obtaining a better sealing effect. In addition, through the bonding and limiting effects of the adhesive limiter, the sealing gasket is not easy to shift laterally even when operating in a gas environment with a higher pressure, and the sealing reliability is better. The sealing gasket is also difficult to separate from the sealing groove, and has good sealing durability.

[0043] Figure 1 This is a schematic diagram of the structure of a fuel cell sealing plate disclosed in the present invention. Figure 1 As shown, the fuel cell sealing plate includes a fuel cell plate and a sealing gasket. A sealing groove is provided on the fuel cell substrate, and the sealing gasket is provided in the sealing groove.

[0044] Reference Figure 1 As shown, as an example of this embodiment, the fuel cell sealing plate can be a bipolar plate in a fuel cell. The bipolar plate has an opposite anode side surface and a cathode side surface. An anode side flow channel can be provided on the anode side surface, and a cathode side flow channel can be provided on the cathode side surface. Furthermore, a sealing groove 111 and a sealing gasket 120 are provided on both sides of the opposite sides of the fuel cell sealing plate. The sealing groove 111 located on the anode side surface 113 is provided around the anode side flow channel to seal the gas in the anode side flow channel. The sealing groove 111 located on the cathode side surface 114 is provided around the cathode side flow channel to seal the gas in the cathode side flow channel.

[0045] Reference Figure 1 As shown in some examples of this embodiment, the fuel cell sealing plate is further provided with a fuel channel 115 connected to the anode side flow channel and an oxidant channel 116 connected to the cathode side flow channel. Two sealing grooves 111 are provided around the fuel channel 115 and the oxidant channel 116.

[0046] Reference Figure 1 As shown in some examples of this embodiment, a coolant channel 117 is further provided in the fuel cell sealing plate, and the two sealing grooves 111 are both provided around the coolant channel 117 .

[0047] Furthermore, Figure 2 for Figure 1A schematic cross-sectional view of the sealing groove 111 of the fuel cell sealing plate, Figure 3 for Figure 2 Schematic diagram of the split structure of the structure shown. Figures 1 to 3 As shown, the fuel cell plate 110 is further provided with a first limiting groove 112, which is provided below and communicates with the sealing groove 111. A second limiting groove 121 is provided on the surface of the sealing gasket 120 near the bottom wall of the sealing groove 111, which is aligned with the first limiting groove 112. The fuel cell sealed plate also includes an adhesive limiting body 130, which fills the first limiting groove 112 and the second limiting groove 121.

[0048] Reference Figure 2 and Figure 3 As shown, it can be understood that in this embodiment, the notch of the first limiting groove 112 is formed on the bottom wall of the sealing groove 111. The notch of the second limiting groove 121 is formed on the surface of the sealing gasket 120 near the bottom wall of the sealing groove 111. The adhesive limiting body 130 has a portion located in the first limiting groove 112 and a portion extending beyond the first limiting groove 112 and located in the second limiting groove 121.

[0049] As an example of this embodiment, the adhesive limiting body 130 may fill the first limiting groove 112 and the second limiting groove 121 .

[0050] As an example of this embodiment, the number of the first limiting grooves 112 is 1 to 10. In some examples, the number of the first limiting grooves 112 can be 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10.

[0051] In this example, the number of the first limiting grooves 112 is 1 to 10, which is beneficial for each first limiting groove 112 to have a relatively sufficient setting space, ensuring that each first limiting groove 112 has a larger adhesion area and a stronger limiting effect.

[0052] As an example of this embodiment, a plurality of first limiting grooves 112 are provided on the fuel cell plate 110 , and a plurality of second limiting grooves 121 are correspondingly provided on the surface of the sealing gasket 120 close to the bottom wall of the sealing groove 111 .

[0053] In this example, a plurality of first limiting grooves 112 and second limiting grooves 121 are provided on the fuel cell substrate. Each first limiting groove 112 and second limiting groove 121 and the adhesive limiting body 130 filled therein can serve as an anchor point between the sealing gasket 120 and the sealing groove 111, thereby further increasing the offset resistance between the sealing gasket 120 and the sealing groove 111, and thereby improving the sealing effect of the sealing gasket 120.

[0054] Reference Figure 2 and Figure 3 As shown, in this embodiment, the number of the first limiting grooves 112 can be two.

[0055] As an example of this embodiment, the extension direction of each first limiting groove 112 intersects with the width direction of the sealing groove 111 , and the multiple first limiting grooves 112 are spaced apart and arranged in sequence in the width direction of the sealing groove 111 .

[0056] In such Figure 2 and Figure 3 In the embodiment shown, the width direction of the sealing groove 111 is the left-right direction, and the extension direction of the first limiting groove 112 is Figure 2 and Figure 3 The direction perpendicular to the plane.

[0057] In this example, when the sealing gasket 120 is impacted by high-pressure gas, it generally undergoes lateral displacement along the width direction of the sealing groove 111. In this embodiment, the extension direction of the plurality of first limiting grooves 112 is arranged to intersect the width direction of the sealing groove 111, which has a stronger blocking and limiting effect on the sealing gasket 120 in the width direction of the sealing groove 111, thereby reducing or preventing lateral displacement of the sealing gasket 120.

[0058] As a further example of this embodiment, the plurality of first limiting grooves 112 are arranged in parallel and perpendicular to the width direction of the sealing groove 111. However, in other examples, the plurality of first limiting grooves 112 may not be arranged in parallel.

[0059] As an example of an embodiment, the cross-sectional area of ​​the first limiting groove 112 in its depth direction is 0.4 mm. 2 ~5mm 2 In some examples, the cross-sectional area of ​​the first limiting groove 112 in its depth direction may be 0.4 mm. 2 , 0.5mm 2 , 0.6mm 2 , 1mm 2 , 1.5mm 2 , 2mm 2 , 3mm 2 , 4mm 2 , 5mm 2 Alternatively, the cross-sectional area of ​​the first limiting groove 112 in its depth direction may also be between any two of the above areas.

[0060] In this example, the cross-sectional area of ​​the first limiting groove 112 is set to 0.4 mm 2 ~5mm 2, which can ensure a relatively large contact area between the adhesive limiter 130 and the wall of the first limit groove 112 , and can also reduce or avoid the negative impact of the first limit groove 112 on the performance of the fuel cell plate 110 .

[0061] As an example of an embodiment, the cross-sectional area of ​​the second limiting groove 121 in its depth direction is 0.4 mm. 2 ~5mm 2 In some examples, the cross-sectional area of ​​the second limiting groove 121 in its depth direction may be 0.4 mm. 2 , 0.5mm 2 , 0.6mm 2 , 1mm 2 , 1.5mm 2 , 2mm 2 , 3mm 2 , 4mm 2 , 5mm 2 Alternatively, the cross-sectional area of ​​the second limiting groove 121 in its depth direction may also be between any two of the above areas.

[0062] In this example, the cross-sectional area of ​​the second limiting groove 121 is set to 0.4 mm 2 ~5mm 2 , which can ensure a relatively large contact area between the adhesive limiting body 130 and the groove wall of the second limiting groove 121, and can also reduce or avoid the negative impact of the second limiting groove 121 on the performance of the sealing gasket 120.

[0063] Reference Figure 2 and Figure 3 As shown, as an example of this embodiment, along the direction from the notch of the first limiting groove 112 toward the bottom wall thereof, the radial dimension of the first limiting groove 112 remains unchanged.

[0064] In this example, by maintaining the cross-sectional dimensions of the first limiting groove 112 constant, the adhesive limiting body 130 has higher strength along the direction close to the notch of the first limiting groove 112. This makes the adhesive limiting body 130 less likely to break when the sealing gasket 120 is impacted, thereby further improving the reliability of the sealing gasket 120. It is understood that in other examples, the radial dimension of the first limiting groove 112 may also gradually shrink.

[0065] Reference Figure 2 and Figure 3 As shown, as an example of this embodiment, along the direction from the notch of the second limiting groove 121 toward the bottom wall thereof, the radial dimension of the second limiting groove 121 remains unchanged.

[0066] In this example, by maintaining the cross-sectional dimensions of the second limiting groove 121 constant, the adhesive limiting body 130 has higher strength along the direction close to the notch of the second limiting groove 121. When the sealing gasket 120 is impacted, the adhesive limiting body 130 is less likely to break, thereby further improving the reliability of the sealing gasket 120. It is understood that in other examples, the radial dimension of the second limiting groove 121 may also gradually shrink.

[0067] Reference Figure 2 and Figure 3 As shown, in this embodiment, the cross-section of the first limiting groove 112 along the direction from the notch opening toward the bottom wall thereof can be rectangular. The cross-section of the second limiting groove 121 along the direction from the notch opening toward the bottom wall thereof can be rectangular. In other embodiments, the cross-sections of the first limiting groove 112 and the second limiting groove 121 along the direction from the notch opening toward the bottom wall thereof can also be independently selected from an inverted triangle, a semicircle, a semi-ellipse, an inverted trapezoid, or other polygons with more than four sides.

[0068] Reference Figure 2 and Figure 3 As shown, as an example of this embodiment, the orthographic projection of the notch of the second limiting groove 121 on the notch of the first limiting groove coincides with the notch of the first limiting groove.

[0069] During use, the adhesive stopper 130 located between the first stopper groove 112 and the second stopper groove 121 is subjected to the greatest impact and is more likely to break. In this example, the notch of the second stopper groove 121 is arranged to overlap with the notch of the first stopper groove 112, which can prevent misalignment between the upper and lower halves of the adhesive stopper 130, thereby further enhancing the strength and stability of the middle portion of the adhesive stopper 130.

[0070] As a further example of this embodiment, the shape of the second limiting groove 121 is mirror-symmetrical to the shape of the first limiting groove.

[0071] As some examples of this embodiment, the sealing gasket 120 is a rubber sealing gasket 120. In some examples, the material of the rubber sealing gasket 120 may include one or more of silicone rubber, fluororubber, nitrile rubber, chloroprene rubber, butyl rubber, and EPDM rubber.

[0072] As some examples of this embodiment, the adhesive limiter 130 is a solid structure formed by curing glue. The glue may include a rubber material. In some examples, the rubber material in the glue includes one or more of silicone rubber, fluororubber, nitrile rubber, chloroprene rubber, butyl rubber, and EPDM rubber.

[0073] In this example, the materials of the sealing gasket 120 and the adhesive limiting body 130 can be the same or different.

[0074] In this example, compared to other materials, rubber gasket 120 is more effective at blocking gas, preventing leakage from within rubber gasket 120 and ensuring that gasket 120 has excellent gas barrier properties. Combined with the design of adhesive stopper 130, the structure formed by gasket 120, sealing groove 111, and adhesive stopper 130 can effectively prevent gas leakage from sealing groove 111.

[0075] As an example of this embodiment, the adhesive limiting body 130 is further extended and disposed between the sealing gasket 120 and the bottom wall of the sealing groove 111 .

[0076] In this embodiment, the adhesive limiter 130 extending between the sealing gasket 120 and the bottom wall of the sealing groove 111 can act as a reinforcing rib, thereby further improving the bonding strength between the adhesive limiter 130 and the bottom wall of the sealing groove 111 and the sealing gasket 120.

[0077] Figure 4 FIG. 1 is a schematic cross-sectional view of the sealing groove 111 of the fuel cell sealing plate in another embodiment. Figure 4 As shown, the fuel cell plate 110 is also provided with a sealing groove 111 and a first limiting groove 112. The first limiting groove 112 is provided below and communicates with the sealing groove 111. A sealing gasket 120 is provided in the sealing groove 111. A second limiting groove 121 is provided on the surface of the sealing gasket 120 near the bottom wall of the sealing groove 111, which is aligned with the first limiting groove 112. An adhesive limiting body 130 is filled in the first limiting groove 112 and the second limiting groove 121.

[0078] Figure 4 The structure shown is Figure 2 The difference between the structures shown mainly lies in the shapes of the first limiting groove 112 and the second limiting groove 121. Figure 4 As shown, as an example of this embodiment, the radial dimension of the first limiting groove 112 gradually decreases along the direction from the notch of the first limiting groove 112 toward the bottom wall thereof. The radial dimension of the second limiting groove 121 gradually decreases along the direction from the notch of the second limiting groove 121 toward the bottom wall thereof.

[0079] Reference Figure 4As shown, as an example of this embodiment, the cross-section of the first limiting groove 112 can be an inverted trapezoidal shape along the direction from the notch of the first limiting groove 112 toward the bottom wall thereof. The cross-section of the second limiting groove 121 can be an inverted trapezoidal shape along the direction from the notch of the second limiting groove 121 toward the bottom wall thereof. Furthermore, corresponding to the shapes of the first limiting groove 112 and the second limiting groove 121, the cross-section of the adhesive limiting body 130 can be a hexagonal shape composed of two inverted trapezoidal shapes.

[0080] Figure 5 FIG. 1 is a schematic cross-sectional view of the sealing groove 111 of the fuel cell sealing plate in another embodiment. Figure 5 As shown, the fuel cell plate 110 is also provided with a sealing groove 111 and a first limiting groove 112. The first limiting groove 112 is provided below and communicates with the sealing groove 111. A sealing gasket 120 is provided in the sealing groove 111. A second limiting groove 121 is provided on the surface of the sealing gasket 120 near the bottom wall of the sealing groove 111, which is aligned with the first limiting groove 112. An adhesive limiting body 130 is filled in the first limiting groove 112 and the second limiting groove 121.

[0081] Figure 5 The structure shown is Figure 2 The difference between the structures shown mainly lies in the shapes of the first limiting groove 112 and the second limiting groove 121. Figure 5 As shown, as an example of this embodiment, along the direction from the notch of the first limiting groove 112 toward the bottom wall thereof, the cross-section of the first limiting groove 112 can be semicircular or semi-elliptical. Along the direction from the notch of the second limiting groove 121 toward the bottom wall thereof, the cross-section of the second limiting groove 121 can be semicircular or semi-elliptical. Furthermore, corresponding to the shapes of the first limiting groove 112 and the second limiting groove 121, the cross-section of the adhesive limiting body 130 can be circular composed of two semicircles, or elliptical composed of two semi-ellipses.

[0082] Figure 6 FIG. 1 is a schematic cross-sectional view of the sealing groove 111 of the fuel cell sealing plate in another embodiment. Figure 6 As shown, the fuel cell plate 110 is also provided with a sealing groove 111 and a first limiting groove 112. The first limiting groove 112 is provided below and communicates with the sealing groove 111. A sealing gasket 120 is provided in the sealing groove 111. A second limiting groove 121 is provided on the surface of the sealing gasket 120 near the bottom wall of the sealing groove 111, which is aligned with the first limiting groove 112. An adhesive limiting body 130 is filled in the first limiting groove 112 and the second limiting groove 121.

[0083] Figure 6 The structure shown is Figure 2 The difference between the structures shown mainly lies in the number and shape of the first limiting grooves 112 and the second limiting grooves 121. Figure 6 As shown, as an example of this embodiment, there is one first limiting groove 112 and one second limiting groove 121. Along the direction from the notch of the first limiting groove 112 toward its bottom wall, the cross-section of the first limiting groove 112 can be an inverted trapezoid. Along the direction from the notch of the second limiting groove 121 toward its bottom wall, the cross-section of the second limiting groove 121 can be an inverted trapezoid. Furthermore, corresponding to the shape of the first limiting groove 112 and the second limiting groove 121, the cross-section of the adhesive limiting body 130 can be a hexagon composed of two inverted trapezoids.

[0084] Figure 7 FIG. 1 is a schematic cross-sectional view of the sealing groove 111 of the fuel cell sealing plate in another embodiment. Figure 7 As shown, the fuel cell plate 110 is also provided with a sealing groove 111 and a first limiting groove 112. The first limiting groove 112 is provided below and communicates with the sealing groove 111. A sealing gasket 120 is provided in the sealing groove 111. A second limiting groove 121 is provided on the surface of the sealing gasket 120 near the bottom wall of the sealing groove 111, which is aligned with the first limiting groove 112. An adhesive limiting body 130 is filled in the first limiting groove 112 and the second limiting groove 121.

[0085] Figure 7 The structure shown is Figure 2 The difference between the structures shown mainly lies in the number and shape of the first limiting grooves 112 and the second limiting grooves 121. Figure 7 As shown, as an example of this embodiment, there are three first limiting grooves 112 and three second limiting grooves 121. Along the direction from the notch of the first limiting groove 112 toward its bottom wall, the cross-section of the first limiting groove 112 can be an inverted triangle. Along the direction from the notch of the second limiting groove 121 toward its bottom wall, the cross-section of the second limiting groove 121 can be an inverted triangle. Furthermore, corresponding to the shape of the first limiting groove 112 and the second limiting groove 121, the cross-section of the adhesive limiting body 130 can be a rhombus composed of two inverted triangles.

[0086] The present disclosure also provides a method for preparing a fuel cell sealing plate. Figure 8 Schematic diagram of the steps of the preparation method. Figure 8 As shown, the preparation method includes steps S1 to S4, which are specifically as follows.

[0087] In step S1 , a fuel cell plate 110 having a sealing groove 111 and a first limiting groove 112 is provided.

[0088] Figure 9 1 is a schematic diagram of the cross-sectional structure of a fuel cell plate 110 provided with a sealing groove 111 and a first limiting groove 112. Figure 9 As shown, the first limiting groove 112 is disposed below the sealing groove 111 and communicates with the sealing groove 111 .

[0089] As an example of this embodiment, the step of providing a fuel cell plate 110 includes: forming a first limiting groove 112 at the bottom of the sealing groove 111 of the fuel cell plate 110, and the method of forming the first limiting groove 112 is selected from mechanical processing, laser ablation or chemical etching.

[0090] In conventional fuel cell plates 110, sealing grooves 111 are formed. In this example, a first limiting groove 112 is formed at the bottom of the sealing groove 111 by machining, laser ablation, or chemical etching. This process is relatively simple, requiring only an additional grooving step compared to conventional techniques, without significantly increasing the number of steps or difficulty involved, and thus offering high practicality.

[0091] As a further example of this embodiment, the mechanical processing method may be, but is not limited to, milling. The chemical etching method may be dry etching or wet etching.

[0092] It can be understood that the shapes and specific configurations of the sealing groove 111 and the first limiting groove 112 in this embodiment can refer to Figure 2 The fuel cell sealing plates in the illustrated embodiment are configured accordingly and will not be described in detail here.

[0093] Step S2: Fill the first limiting groove 112 with limiting glue.

[0094] Figure 10 For Figure 9 The cross-sectional structure diagram of the structure shown is filled with limiting glue. Figure 10 As shown, the limiting glue exceeds the notch of the first limiting groove 112.

[0095] As an example of this embodiment, the method of filling the first limiting groove 112 with limiting glue is selected from screen printing, dispensing, spraying or integrated injection molding.

[0096] In this example, by adopting screen printing, dispensing, spraying or integrated injection molding, the coating position and coating amount of the limiting glue can be made more precise, thereby obtaining an adhesive limiting body 130 of better quality.

[0097] As an example of this embodiment, the material of the limiting glue includes one or more of silicone rubber, fluororubber, nitrile rubber, chloroprene rubber, butyl rubber and EPDM rubber.

[0098] In this example, rubber is more effective at blocking gas than other materials, preventing leakage from within the adhesive stopper 130 and ensuring that the adhesive stopper 130 has good gas barrier properties. Furthermore, the use of the rubber-containing stopper glue can generate stronger adhesion to the sealing gasket 120 and reduce micro gas channels within the stopper glue.

[0099] Step S3 , placing the sealing gasket 120 having the second limiting groove 121 in the sealing groove 111 , and filling the second limiting groove 121 with limiting glue.

[0100] In this embodiment, when the sealing gasket 120 having the second limiting groove 121 is disposed in the sealing groove 111 , the notch of the second limiting groove 121 can be aligned with the notch of the first limiting groove 112 .

[0101] It can be understood that in this embodiment, since the limiting glue in step S2 exceeds the notch of the first limiting groove 112, when the sealing gasket 120 is set in the sealing groove 111, the limiting glue located above the notch of the first limiting groove 112 will fill the second limiting groove.

[0102] As an example of this embodiment, the material of the sealing gasket 120 includes one or more of silicone rubber, fluororubber, nitrile rubber, chloroprene rubber, butyl rubber, and EPDM rubber.

[0103] In this embodiment, rubber is more effective at blocking gas than other materials, preventing leakage from within the seal 120 and ensuring that the seal 120 and the adhesive stopper 130 together have excellent gas barrier properties. Furthermore, the use of the rubber-containing seal 120 creates stronger adhesion with the stopper glue and reduces micro-gas channels within the stopper glue.

[0104] In step S4 , the limiting glue is cured to form an adhesive limiting body 130 located in the first limiting groove 112 and the second limiting groove 121 .

[0105] As an example of this embodiment, the way to solidify the limiting glue can be room temperature solidification or heat solidification. As a further example of this embodiment, the temperature for solidifying the limiting glue is 20°C to 150°C. In some examples, the temperature for solidifying the limiting glue can be 20°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 120°C, 150°C, or the temperature for solidifying the limiting glue can also be between any two of the above temperatures.

[0106] It can be understood that the curing temperature can be selected accordingly according to the material of the limiting glue. For example, when the material of the limiting glue is silicone rubber, it can be cured at room temperature. In addition, in this example, curing the limiting glue at a temperature of 20°C to 150°C can avoid the negative impact of high temperature or low temperature conditions on the reliability of the sealing gasket 120, and ensure that the sealing gasket 120 maintains its original shape and mechanical properties during the curing process. When the curing temperature is too high, the sealing gasket 120 may be heated and aged faster, resulting in a significant shortening of its service life. When the curing temperature is too low, the sealing gasket 120 may become cold and brittle, resulting in a significant decrease in its barrier performance to gas.

[0107] It can be understood that after the above steps S1 to S4, the following can be prepared: Figure 2 The fuel cell sealing plate is shown.

[0108] In this embodiment, by applying limiting glue to the first limiting groove 112 and then placing the sealing gasket 120 in the sealing groove 111, the limiting glue that exceeds the notch of the first limiting groove 112 is squeezed out and filled into the second limiting groove 121 in the sealing gasket 120. The limiting glue cures in situ in the first limiting groove 112 and the second limiting groove 121, thereby having strong adhesion to the groove walls. After curing, the limiting glue forms an adhesive limiting body 130, thereby also achieving a good limiting effect.

[0109] Furthermore, the present disclosure also provides a fuel cell, which includes multiple fuel cell sealing plates as in any of the above embodiments, or the fuel cell includes multiple fuel cell sealing plates prepared by the preparation method of any of the above embodiments, and the multiple fuel cell sealing plates are arranged in parallel in sequence, and the sealing between two adjacent fuel cell sealing plates is achieved by a sealing gasket 120.

[0110] As an example of this embodiment, the fuel cell may further include a membrane electrode, which is disposed between two adjacent fuel cell sealing plates.

[0111] As an example of this embodiment, the fuel cell may also include two end plates disposed opposite to each other, with a plurality of fuel cell sealing plates stacked between the two end plates.

[0112] The present application is further described in detail below in conjunction with several specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in this application.

[0113] Unless otherwise defined, all technical terms used hereinafter have the same meanings as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0114] Some specific examples are listed below. It should be noted that the examples described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. Where specific techniques or conditions are not specified in the examples, the techniques or conditions described in the literature in this area or the product specifications are used. Reagents or instruments used without manufacturer's indication are all commercially available conventional products.

[0115] Example 1

[0116] A fuel cell bipolar plate with a sealing groove around its periphery is provided. A first limiting groove is opened on the bottom wall of the sealing groove along the extending direction of the sealing groove by CNC processing. The cross section of the first limiting groove is an inverted trapezoidal structure with a larger upper portion and a smaller lower portion, and the cross-sectional area is 1mm 2 .

[0117] The first limiting groove is filled with silicone rubber glue by dispensing, and the amount of glue slightly exceeds the notch of the first limiting groove.

[0118] A sealing gasket with a second limiting groove is pressed into the sealing groove. The material of the sealing gasket is silicone rubber. The cross-sectional shape of the second limiting groove is symmetrical to the cross-sectional shape of the first limiting groove. The notch of the second limiting groove is arranged in alignment with the first limiting groove, and the glue fills the first limiting groove and the second limiting groove.

[0119] The glue is cured at room temperature to form adhesive limiting bodies in the first limiting groove and the second limiting groove.

[0120] Multiple fuel cell bipolar plates and sealing gaskets are stacked in sequence to form a fuel cell.

[0121] Example 2

[0122] The only difference between Example 2 and Example 1 is that the cross-sections of the first limiting groove and the second limiting groove of Example 2 are rectangular.

[0123] Example 3

[0124] The only difference between Example 3 and Example 1 is that the cross-sectional area of ​​the first limiting groove and the second limiting groove of Example 3 are both 0.05mm 2 .

[0125] Example 4

[0126] The only difference between Example 4 and Example 1 is that the cross-sectional area of ​​the first limiting groove and the second limiting groove of Example 4 are both 5mm 2 .

[0127] Example 5

[0128] The only difference between Example 5 and Example 1 is that: in Example 5, there are three first limiting grooves and three second limiting grooves, the three first limiting grooves are parallel to each other, and the three second limiting grooves are parallel to each other.

[0129] Comparative Example 1

[0130] The only difference between Comparative Example 1 and Example 1 is that the first limiting groove is not prepared in the sealing groove in Comparative Example 1, and the sealing gasket does not have a second limiting groove.

[0131] Comparative Example 2

[0132] The only difference between Comparative Example 2 and Example 1 is that the sealing groove in Comparative Example 2 has a first limiting groove, and the sealing gasket does not have a second limiting groove.

[0133] Comparative Example 3

[0134] The only difference between Comparative Example 3 and Example 1 is that the sealing gasket in Comparative Example 3 has a second limiting groove, and the sealing groove does not have a first limiting groove.

[0135] Experiment: The fuel cells of the above embodiments and comparative examples were subjected to a pressure test under a gas pressure of 150 kPa. The pressure drops in the fuel channel, oxidant channel, and coolant channel of each fuel cell were measured. The results can be seen in Table 1.

[0136] Table 1

[0137] Coolant channel pressure drop (kPa) Fuel channel pressure drop (kPa) Oxidant channel pressure drop (kPa) Example 1 0 0.2 0.2 Example 2 0 0.2 0.2 Example 3 0 0.2 0.2 Example 4 0 0.1 0.1 Example 5 0 0.1 0.1 Comparative Example 1 0.3 0.5 0.5 Comparative Example 2 0.2 0.4 0.4 Comparative Example 3 0.2 0.4 0.4

[0138] Refer to the contents of the above embodiments, comparative examples and Table 1. Examples 1 to 5 all adopt the fuel cell sealing plate structure disclosed in the present invention, and no obvious pressure drop occurs in the coolant channel during the pressure test. In contrast, the first limiting groove and the second limiting groove are not provided in Comparative Example 1, and the coolant channel pressure drop, the fuel channel pressure drop and the oxidant channel pressure drop are significantly higher than those in Examples 1 to 5. In addition, only a separate first limiting groove is provided in Comparative Example 2, and only a separate second limiting groove is provided in Comparative Example 3. Compared with Comparative Example 1, the pressure drop of each channel in Comparative Example 2 and Comparative Example 3 is only reduced by 0.1kP. Quantitative analysis shows that, compared with Comparative Example 1, the reduction in Example 1 is higher than the sum of the reductions in Comparative Example 2 and Comparative Example 3, which shows that the provision of the first limiting groove and the second limiting groove has a synergistic effect in reducing the pressure drop, further illustrating that the simultaneous provision of the first limiting groove and the second limiting groove can significantly improve the sealing performance.

[0139] The pressure drop of the fuel channel and the oxidant channel of Example 1 are both 0.2kPa. Compared with Example 1, the pressure drops of the fuel channel and the oxidant channel of Example 2 and Example 3 are basically the same, indicating that similar sealing effects can be achieved by adopting other shapes or first limiting grooves and second limiting grooves with smaller cross-sectional areas. The pressure drop of the fuel channel and the oxidant channel of Example 4 is only 0.1kPa, indicating that as the cross-sectional area of ​​the first limiting groove and the second limiting groove increases, the sealing performance is also improved. However, the cross-sectional area is not suitable for unlimited increase. As the cross-sectional area further increases to more than 5mm 2 , the sealing performance may actually decrease. This is mainly because excessively large limiting grooves can negatively impact the strength of the gasket. In Example 5, there are three first and second limiting grooves, and the pressure drop in the fuel and oxidant channels is only 0.1 kPa, indicating that increasing the number of limiting grooves further enhances the sealing performance. However, increasing the number of limiting grooves indefinitely is not suitable, as doing so will not only negatively impact the strength of the gasket but also complicate manufacturing.

[0140] Please note that the above embodiments are for illustrative purposes only and are not intended to be limiting of this document.

[0141] It should be understood that, unless otherwise expressly stated herein, there is no strict order restriction for the execution of steps, and these steps may be executed in other orders. Furthermore, at least a portion of the steps in the preparation process may include multiple sub-steps or multiple stages, and these sub-steps or stages do not necessarily need to be completed at the same time, but may also be executed at different times. The order of execution of these sub-steps or stages is not necessarily sequential, but may be executed in rotation or alternation with other steps or at least a portion of the sub-steps or stages of other steps.

[0142] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0143] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A fuel cell sealing plate, characterized in that: It includes fuel cell plates, sealing gaskets and adhesive limiters; The fuel cell plate is provided with a sealing groove and a first limiting groove, wherein the first limiting groove is provided below the sealing groove and communicates with the sealing groove; The sealing gasket is arranged in the sealing groove, and a second limiting groove aligned with the first limiting groove is provided on the surface of the sealing gasket close to the bottom wall of the sealing groove, and the adhesive limiting body is filled in the first limiting groove and the second limiting groove.

2. The fuel cell sealing plate according to claim 1, characterized in that: A plurality of first limiting grooves are provided on the fuel cell plate, and a plurality of second limiting grooves are correspondingly provided on the surface of the sealing gasket close to the bottom wall of the sealing groove.

3. The fuel cell sealing plate according to claim 2, characterized in that: The number of the first limiting grooves is 1 to 10.

4. The fuel cell sealing plate according to claim 3, characterized in that: An extension direction of each of the first limiting grooves intersects with a width direction of the sealing groove, and a plurality of the first limiting grooves are spaced apart and arranged in sequence in the width direction of the sealing groove.

5. The fuel cell sealing plate according to any one of claims 1 to 4, characterized in that: The cross-sectional area of ​​the first limiting groove in its depth direction is 0.4 mm 2 ~5mm 2 and / or, The cross-sectional area of ​​the second limiting groove in its depth direction is 0.4 mm 2 ~5mm 2 .

6. The fuel cell sealing plate according to claim 5, characterized in that: Along the direction from the notch of the first limiting groove to the bottom wall thereof, the radial dimension of the first limiting groove gradually shrinks; or, Along the direction from the notch of the first limiting groove toward the bottom wall thereof, the radial dimension of the first limiting groove remains unchanged.

7. The fuel cell sealing plate according to any one of claims 1 to 4 and 6, characterized in that: The orthographic projection of the notch of the second limiting groove on the notch of the first limiting groove coincides with the notch of the first limiting groove.

8. The fuel cell sealing plate according to any one of claims 1 to 4 and 6, characterized in that: The sealing gasket is a rubber sealing gasket; and / or, The adhesive limiter is a solid structure formed after the glue is cured.

9. The fuel cell sealing plate according to claim 8, characterized in that: The adhesive limiting body is further extended and arranged between the sealing gasket and the bottom wall of the sealing groove.

10. A fuel cell, characterized in that: The fuel cell comprises a plurality of fuel cell sealing plates according to any one of claims 1 to 9, wherein the plurality of fuel cell sealing plates are arranged in parallel in sequence, and the sealing between two adjacent fuel cell sealing plates is achieved by the sealing gasket.

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