Sealing structure, single cell, electric pile and fuel cell

Abstract

The utility model provides a sealing structure, a monocell, an electric pile and a fuel cell, the sealing structure is applied to a polar plate, the polar plate comprises a first polar plate and a second polar plate which are matched with each other, and the sealing structure comprises a first sealing structure and a second sealing structure, the first sealing structure comprises a first sealing part and a first protruding part which are connected with each other; the second sealing structure is used for being arranged on the side, facing the first polar plate, of the second polar plate, and the second sealing structure comprises a second sealing part and a second protruding part which are connected with each other; when the first polar plate and the second polar plate are stacked in the thickness direction, the first protruding part and the second sealing part are attached to each other, the second protruding part and the first sealing part are attached to each other, and a gap is formed between the first protruding part and the second protruding part. By means of the technical scheme, the problem that in the prior art, the sealing structure is prone to sealing failure due to the fact that the sealing structure shifts when the polar plate is assembled can be solved.

Description

Technical Field

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

[0002] In the prior art, a single cell is packaged by a cathode plate, a membrane electrode, and an anode plate. Each group of single cells needs to form a closed cavity to ensure that fluids such as hydrogen, air, or coolant do not leak. In the prior art, a sealing strip is usually set on the cathode plate and the anode plate. When the anode plate and the cathode plate are combined, the sealing strips set on the anode plate and the cathode plate fit each other to seal the single cell. However, the fuel cell stack is usually composed of multiple single cells stacked in the thickness direction. With the gradual development of fuel cell technology, a greater demand is put forward for the capacity of fuel cells. In order to increase the capacity of fuel cells, it is necessary to increase the number of single cells in the stack. When more single cells are stacked and assembled, the cathode plate and the anode plate in the single cell are prone to a certain offset, resulting in assembly misalignment, which affects the sealing performance of the sealing strip. Utility Model Content

[0003] The utility model provides a sealing structure, a single cell, a battery stack and a fuel cell, so as to solve the problem in the prior art that the sealing structure is easily deviated during the assembly of polar plates, which may lead to sealing failure of the sealing structure.

[0004] According to one aspect of the utility model, a sealing structure is provided, which is applied to a pole plate, and the pole plate comprises a first pole plate and a second pole plate which cooperate with each other, and the sealing structure comprises: a first sealing structure, which is used to be arranged on a side of the first pole plate facing the second pole plate, and the first sealing structure comprises a first sealing portion and a first protrusion which are connected to each other, and the first protrusion is arranged to protrude from the first sealing portion along the thickness direction of the first pole plate; a second sealing structure, which is used to be arranged on a side of the second pole plate facing the first pole plate, and the second sealing structure comprises a second sealing portion and a second protrusion which are connected to each other, and the second protrusion is arranged to protrude from the second sealing portion along the thickness direction of the second pole plate; when the first pole plate and the second pole plate are stacked along the thickness direction, the first protrusion and the second sealing portion are in contact with each other, and the second protrusion and the first sealing portion are in contact with each other, and there is a gap between the first protrusion and the second protrusion.

[0005] Further, an end surface of the first protrusion close to the second sealing structure is arc-shaped, and / or an end surface of the second protrusion close to the first sealing structure is arc-shaped.

[0006] Further, the surface where the first sealing portion cooperates with the second protrusion is a plane, and / or the surface where the second sealing portion cooperates with the first protrusion is a plane.

[0007] Furthermore, the first sealing structure and the second sealing structure are both annular, the first sealing structure is used to surround the periphery of the first electrode plate, and the second sealing structure is used to surround the periphery of the second electrode plate.

[0008] Furthermore, the first sealing structure and the second sealing structure are made of soft rubber material.

[0009] Furthermore, the molding process of the first sealing structure and the second sealing structure is one of injection molding, compression molding, dispensing molding and silk screen molding.

[0010] Furthermore, the first sealing structure and the second sealing structure are both integrally formed structures.

[0011] According to another aspect of the present invention, a single cell is provided, comprising a first electrode plate, a membrane electrode, a second electrode plate and the above-mentioned sealing structure, wherein the membrane electrode is located between the first electrode plate and the second electrode plate, and the sealing structure is surrounded between the periphery of the first electrode plate and the periphery of the second electrode plate.

[0012] According to another aspect of the present invention, a battery stack is provided, the battery stack comprising a plurality of single cells, the plurality of single cells are stacked along a thickness direction of the single cells to form the battery stack, and the single cells are the above-mentioned single cells.

[0013] According to another aspect of the present invention, a fuel cell is provided. The fuel cell includes a fuel cell stack, and the fuel cell stack is the fuel cell stack described above.

[0014] By applying the technical solution of the utility model, a double-peak seal can be formed between the first electrode plate and the second electrode plate by setting the first protrusion and the second sealing portion to fit each other, and the second protrusion and the first sealing portion to fit each other, and the first protrusion and the second protrusion are spaced. Compared with the technical solution using ordinary sealing strips in the traditional technical solution, the technical solution of the present application can provide a certain degree of freedom of misalignment and displacement for the assembly of the electrode plates during the stacking process of the electrode plates. When the first electrode plate and the second electrode plate are misaligned, the relative displacement of the first protrusion and the second protrusion can be compensated by the space, so that the sealing area between the first electrode plate and the second electrode plate will not be reduced. The first electrode plate and the second electrode plate can still be sealed by the first sealing portion and the second sealing portion to prevent the fluid inside the single cell from leaking, thereby providing higher sealing reliability for the single cell sealing; and the double-peak seal structure has higher creep resistance. When the first protrusion and the second protrusion are subjected to the stacking load of the electrode plates, the deformation of the first sealing structure and the second sealing structure can be compensated to a certain extent by the space, thereby further improving the sealing life of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 The schematic diagram of the structure of the cooperation between the first electrode plate and the second electrode plate provided by the utility model is shown.

[0017] The above drawings include the following reference numerals:

[0018] 10. first electrode plate; 11. first sealing portion; 12. first protrusion;

[0019] 20. second electrode plate; 21. second sealing portion; 22. second protrusion;

[0020] 30. Sealing groove. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] like Figure 1 As shown, an embodiment of the utility model provides a sealing structure, which is applied to a plate, and the plate includes a first plate 10 and a second plate 20 that cooperate with each other, and the sealing structure includes a first sealing structure and a second sealing structure. Among them, the first sealing structure is used to be arranged on the side of the first plate 10 facing the second plate 20, and the first sealing structure includes a first sealing portion 11 and a first protrusion 12 that are connected to each other, and the first protrusion 12 is arranged along the thickness direction of the first plate 10 to protrude the first sealing portion 11; the second sealing structure is used to be arranged on the side of the second plate 20 facing the first plate 10, and the second sealing structure includes a second sealing portion 21 and a second protrusion 22 that are connected to each other, and the second protrusion 22 is arranged along the thickness direction of the second plate 20 to protrude the second sealing portion 21; when the first plate 10 and the second plate 20 are stacked in the thickness direction, the first protrusion 12 and the second sealing portion 21 are mutually attached, and the second protrusion 22 and the first sealing portion 11 are mutually attached, and there is a gap between the first protrusion 12 and the second protrusion 22.

[0023] By applying the technical solution of the utility model, by setting the first protrusion 12 and the second sealing portion 21 to be fitted together, and the second protrusion 22 and the first sealing portion 11 to be fitted together, a double-peak seal can be formed between the first electrode plate 10 and the second electrode plate 20, and there is a gap between the first protrusion 12 and the second protrusion 22. Compared with the technical solution using ordinary sealing strips in the traditional technical solution, the technical solution of the present application can provide a certain degree of freedom for misalignment and offset for the assembly of the electrode plates during the stacking process of the electrode plates. When the first electrode plate 10 and the second electrode plate 20 are misaligned, the gap between the first protrusion 12 and the second electrode plate 22 can be used to compensate for the misalignment of the first electrode plate 10 and the second electrode plate 20. 2 and the second protrusion 22 undergo relative displacement, so that the sealing area between the first electrode plate 10 and the second electrode plate 20 will not be reduced, and the first electrode plate 10 and the second electrode plate 20 can still be sealed by the first sealing portion and the second sealing portion to prevent leakage of the fluid inside the single cell, thereby providing higher sealing reliability for the single cell sealing; and, the double-peak seal structure has higher creep resistance, and when the first protrusion 12 and the second protrusion 22 are subjected to the stacking load of the electrode plates, the deformation of the first sealing structure and the second sealing structure can be compensated to a certain extent by the spacing, thereby further improving the sealing effect of the sealing structure.

[0024] In a specific embodiment of the utility model, the end face of the first protrusion 12 close to the second sealing structure is arc-shaped. Through the above-mentioned arrangement, when the first protrusion 12 is subjected to external pressure, it can produce a certain deformation, thereby increasing the contact area with the second sealing portion 21, thereby improving the sealing effect and reducing the possibility of leakage. The arc shape can provide better elasticity and recovery, and can still maintain good sealing performance even after long-term use, thereby extending the service life of the first sealing portion.

[0025] In a specific embodiment of the utility model, the end surface of the second protrusion 22 close to the first sealing structure is arc-shaped. Through the above arrangement, when the second protrusion 22 is subjected to external pressure, it can produce a certain deformation, increase the contact area with the first sealing part 11, thereby improving the sealing effect and reducing the possibility of leakage, and the arc shape can provide better elasticity and recovery, even after long-term use, it can still maintain good sealing performance, and extend the service life of the second sealing part.

[0026] In another specific embodiment of the present invention, the end surface of the first protrusion 12 close to the second sealing structure and the end surface of the second protrusion 22 close to the first sealing structure are both arc-shaped. Through the above arrangement, the sealing performance of the first electrode plate 10 and the second electrode plate 20 can be further improved, the service life of the first sealing part and the second sealing part can be extended, and the sealing failure of the sealing structure can be prevented.

[0027] In a feasible embodiment of the present application, the surface where the first sealing portion 11 cooperates with the second protrusion 22 is a plane, so as to ensure that a stable seal can be generated between the second protrusion 22 and the first sealing portion when the second protrusion 22 cooperates with the first sealing portion.

[0028] In a feasible embodiment of the present application, the surface where the second sealing portion 21 cooperates with the first protrusion 12 is a plane, so as to ensure that a stable seal can be generated between the first protrusion 12 and the second sealing portion when the first protrusion 12 cooperates with the second sealing portion.

[0029] In another feasible embodiment of the present application, the surface where the first sealing portion 11 cooperates with the second protrusion 22 is a plane, and the surface where the second sealing portion 21 cooperates with the first protrusion 12 is also a plane, thereby further improving the sealing performance of the sealing structure.

[0030] Furthermore, both the first sealing structure and the second sealing structure are annular, the first sealing structure is used to surround the periphery of the first electrode plate 10, and the second sealing structure is used to surround the periphery of the second electrode plate 20. Through the above arrangement, the sealing performance between the first electrode plate 10 and the second electrode plate 20 can be improved. Further, a plurality of through holes are provided on the first electrode plate 10 and the second electrode plate 20, and a plurality of fluids such as air, hydrogen and coolant are contained in the through holes. The first sealing part and the second sealing part are both arranged around the periphery of the through holes to further improve the sealing performance of the single cell.

[0031] Specifically, the first sealing structure and the second sealing structure are made of soft rubber. In the field of fuel cells, the explosion range of hydrogen is relatively low, so the sealing of the single cell needs to play a certain impact resistance role while playing a sealing role. By setting the first sealing structure and the second sealing structure to be made of soft rubber material, the elasticity of the soft rubber material can be used to increase the service life of the single cell. Specifically, the first sealing structure and the second sealing structure can be set to polyisoprene rubber, polybutadiene rubber, polychloroprene rubber or ethylene propylene diene rubber, etc.

[0032] Furthermore, the molding process of the first sealing structure and the second sealing structure is one of injection molding, compression molding, dispensing molding and silk screen molding to ensure the sealing performance, dimensional accuracy and consistency of the first sealing structure and the second sealing structure, and prevent leakage between the first electrode plate 10 and the second electrode plate 20.

[0033] Specifically, the first sealing structure and the second sealing structure are both integrally formed structures. Through the above-mentioned arrangement, the integrity of the first sealing structure and the second sealing structure can be ensured, and the first protrusion 12 or the second protrusion 22 can be prevented from falling off when the first protrusion 12 and the second protrusion 22 move relative to each other, thereby ensuring the performance of the first sealing structure and the second sealing structure.

[0034] In the present application, the surface of the first sealing portion 11 facing the second electrode plate 20 protrudes from the surface of the first electrode plate 10, and the surface of the second sealing portion 21 facing the first electrode plate 10 protrudes from the surface of the second electrode plate 20. Through the above arrangement, it is possible to ensure that during the assembly process of the first electrode plate 10 and the second electrode plate 20, the first sealing structure and the second sealing structure can be stably fitted, and the phenomenon that the first sealing portion 11 cannot fit with the second protrusion 22 and the second sealing portion 21 cannot fit with the first protrusion 12 after the first electrode plate 10 is fitted with the second electrode plate 20 is prevented, thereby ensuring the sealing effect of the first sealing structure and the second sealing structure.

[0035] According to another embodiment of the present application, a single cell is provided, which includes a first electrode plate 10, a membrane electrode, a second electrode plate 20 and the above-mentioned sealing structure. The membrane electrode is located between the first electrode plate 10 and the second electrode plate 20, and the sealing structure is surrounded between the periphery of the first electrode plate 10 and the periphery of the second electrode plate 20. By arranging the above-mentioned sealing structure between the first electrode plate 10 and the second electrode plate 20, stable sealing of the single cell can be achieved through the sealing structure, thereby reducing the possibility of leakage of the first electrode plate 10 and the second electrode plate 20 of the single cell during the stacking process.

[0036] In the present application, a sealing groove 30 is provided at one end of the first electrode plate 10 facing the second electrode plate 20 and at one end of the second electrode plate 20 facing the first electrode plate 10, and the first sealing structure and the second sealing structure are both provided in the corresponding sealing groove 30. Through the above arrangement, the first sealing structure and the second sealing structure are provided in the sealing groove 30. When the first electrode plate 10 and the second electrode plate 20 are assembled, the sealing groove 30 can limit the deformation of the first sealing structure and the second sealing structure, and prevent the first sealing structure and the second sealing structure from being excessively deformed due to mutual extrusion, which may cause the first sealing structure and the second sealing structure to be misaligned as a whole, so that the sealing reliability of the first electrode plate 10 and the second electrode plate 20 after assembly can be ensured.

[0037] Furthermore, the width of the sealing groove 30 is greater than the width of the first sealing structure and the second sealing structure. Through the above arrangement, the first sealing structure and the second sealing structure can be easily installed, and when the first electrode plate 10 and the second electrode plate 20 are assembled, the first sealing structure and the second sealing structure will be deformed to a certain extent under pressure, and the width of the sealing groove 30 is greater than the width of the first sealing structure and the second sealing structure, which can compensate for the deformation of the first sealing structure and the second sealing structure. The deformation of the first sealing structure and the second sealing structure can also increase the sealing area between the first electrode plate 10 and the second electrode plate 20, further improving the sealing effect of the single cell.

[0038] According to another embodiment of the present application, a battery stack is provided, the battery stack includes a plurality of single cells, and the plurality of single cells are stacked along the thickness direction of the single cells to form a battery stack, and the single cells are the above-mentioned single cells. When the plurality of single cells are stacked to form a battery stack, the first sealing part and the second sealing part can cooperate with each other to provide a certain degree of freedom of misalignment and displacement for the assembly of the battery stack, prevent the fluid inside the battery stack from leaking, and provide a higher sealing reliability for the battery stack seal. In a fuel cell, the sealing area is closely related to the stacking load. The larger the sealing area, the greater the stacking load. The stacking load will affect the overall performance of the battery stack. Excessive stacking load will affect the assembly and stability of the battery stack, and will reduce the service life of the seal. In the present application, by setting a double-peak structure for the first sealing part and the second sealing part, the contact area between the first sealing part and the second sealing part can be reduced, thereby reducing the sealing contact surface, reducing the stacking load on the single cell stack, while improving the sealing effect of the battery stack, and further improving the performance of the battery stack.

[0039] According to another embodiment of the present application, a fuel cell is provided, the fuel cell includes a stack, and the stack is the stack described above. The fuel cell provided by the present application can ensure the sealing performance of the stack in the fuel cell, prevent leakage of the fluid in the stack, and at the same time, the stack is subjected to a smaller loading load when the stack is loaded, which is more conducive to improving the sealing life of the stack, improving the performance of the stack, and thus ensuring the use effect of the fuel cell.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0042] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0045] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sealing structure, characterized in that: The sealing structure is applied to a polar plate, the polar plate comprising a first polar plate (10) and a second polar plate (20) that cooperate with each other, and the sealing structure comprises: a first sealing structure, used for being arranged on a side of the first electrode plate (10) facing the second electrode plate (20), the first sealing structure comprising a first sealing portion (11) and a first protruding portion (12) connected to each other, the first protruding portion (12) being arranged to protrude from the first sealing portion (11) along a thickness direction of the first electrode plate (10); a second sealing structure, used for being arranged on a side of the second electrode plate (20) facing the first electrode plate (10), the second sealing structure comprising a second sealing portion (21) and a second protruding portion (22) connected to each other, the second protruding portion (22) being arranged to protrude from the second sealing portion (21) along a thickness direction of the second electrode plate (20); When the first electrode plate (10) and the second electrode plate (20) are stacked in the thickness direction, the first protrusion (12) and the second sealing portion (21) are in contact with each other, and the second protrusion (22) and the first sealing portion (11) are in contact with each other, and there is a gap between the first protrusion (12) and the second protrusion (22).

2. The sealing structure according to claim 1, characterized in that: The end surface of the first protrusion (12) close to the second sealing structure is arc-shaped, and / or the end surface of the second protrusion (22) close to the first sealing structure is arc-shaped.

3. The sealing structure according to claim 1, characterized in that: The surface on which the first sealing portion (11) cooperates with the second protrusion (22) is a plane, and / or the surface on which the second sealing portion (21) cooperates with the first protrusion (12) is a plane.

4. The sealing structure according to claim 1, characterized in that: The first sealing structure and the second sealing structure are both annular; the first sealing structure is used to surround the periphery of the first electrode plate (10), and the second sealing structure is used to surround the periphery of the second electrode plate (20).

5. The sealing structure according to claim 1, characterized in that: The first sealing structure and the second sealing structure are made of soft rubber material.

6. The sealing structure according to claim 1, characterized in that: The molding process of the first sealing structure and the second sealing structure is one of injection molding, compression molding, dispensing molding and silk screen molding.

7. The sealing structure according to claim 1, characterized in that: The first sealing structure and the second sealing structure are both integrally formed structures.

8. A single battery, characterized in that: The single cell comprises a first electrode plate (10), a membrane electrode, a second electrode plate (20) and a sealing structure according to any one of claims 1 to 7, wherein the membrane electrode is located between the first electrode plate (10) and the second electrode plate (20), and the sealing structure is surrounded between the periphery of the first electrode plate (10) and the periphery of the second electrode plate (20).

9. A battery stack, characterized in that: The battery stack includes a plurality of single cells, and the plurality of single cells are stacked along a thickness direction of the single cells to form the battery stack. The single cells are the single cells described in claim 8.

10. A fuel cell, characterized in that: The fuel cell includes a fuel cell stack, and the fuel cell stack is the fuel cell stack according to claim 9.

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