Monopolar plate assemblies, single cells, stack assemblies and fuel cells

Abstract

The present application provides a monopolar plate assembly, a single cell, a stack assembly, and a fuel cell, wherein the monopolar plate assembly comprises: a plate body having a first side surface, the first side surface having a coolant flow channel region extending along its length and a first protrusion located outside the coolant flow channel region; and a seal disposed on the first side surface; the seal comprising a first sealing ring and a second sealing ring, the first sealing ring being disposed at the flow channel edge of the coolant flow channel region for sealing the coolant flow channel region; the second sealing ring being disposed around the first sealing ring and located at the length edge of the plate body; the first sealing ring and the second sealing ring being spaced apart in the width direction of the plate body to form a gap; the first protrusion being located within the gap. The present application aims to simultaneously improve the sealing of the coolant flow channel and the electrical conductivity between single cells.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a monopolar plate assembly, a single cell, a stack assembly, and a fuel cell. Background Art

[0002] The fuel cell stack is the core component of a fuel cell. The stack consists of multiple stacked cells. The cathode plate of one of the two adjacent cells contacts the anode plate of the other, making them electrically connected. To ensure good electrical conductivity, there is a certain conductive contact area between the two. At the same time, because the stack generates heat during power generation, a coolant flow channel is formed between the cathode plate of one of the two adjacent cells and the anode plate of the other, and a seal is provided to seal the coolant flow channel to ensure that the stack is maintained within a reasonable operating temperature.

[0003] However, in the prior art, the provision of a sealant can lead to a reduction in the conductive contact area. Therefore, how to ensure that two adjacent single cells have a larger conductive area and a better sealing effect is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The present application provides a monopolar plate assembly, a single cell, a stack assembly and a fuel cell, aiming to simultaneously improve the sealing effect and the conductive effect.

[0005] The present application provides a monopolar plate assembly, comprising:

[0006] a plate body, the plate body having a first side surface, the first side surface having a coolant flow channel area formed along the length thereof and a first protrusion disposed outside the coolant flow channel area; and

[0007] A seal, wherein the seal is arranged on the first side surface; the seal includes a first sealing ring and a second sealing ring, the first sealing ring is arranged at the flow channel edge of the coolant flow channel area, and is used to seal the coolant flow channel area; the second sealing ring is arranged around the first sealing ring and is located at the length edge of the plate body; the first sealing ring and the second sealing ring are spaced apart in the width direction of the plate body to form a gap; the first protrusion is located in the gap.

[0008] Optionally, the sealing member further includes a connecting portion; the connecting portion is disposed in the gap and connects the first sealing ring and the second sealing ring.

[0009] Optionally, the first protrusion is provided with a groove, and the connecting portion is embedded in the groove.

[0010] Optionally, the side of the first sealing ring facing away from the second sealing ring has a plurality of peaks protruding toward the coolant flow channel area and a plurality of valleys recessed away from the coolant flow channel area, the plurality of peaks and the plurality of valleys are spaced apart in the length direction, and two adjacent peaks are connected by the valleys.

[0011] Optionally, the second sealing ring includes a ring body and a plurality of sealing protrusions; the plurality of sealing protrusions are arranged on a side of the ring body facing away from the first sealing ring and are spaced apart in the length direction, and the plate body is exposed between two adjacent sealing protrusions.

[0012] Optionally, the present application further proposes a single battery, comprising:

[0013] Conductive electrode plate;

[0014] membrane electrode; and

[0015] As described above, the membrane electrode is arranged between the conductive electrode plate and the monopolar plate assembly; the plate body has a second side surface arranged opposite to the first side surface, and the membrane electrode is arranged facing the second side surface.

[0016] Optionally, the present application further provides a battery stack assembly comprising a plurality of stacked single cells as described above; the conductive plate having a second protrusion disposed away from the membrane electrode; wherein the second protrusion of the conductive plate of one of two adjacent single cells contacts the first protrusion of the other monopolar plate assembly; wherein the sum of the heights of the first and second protrusions is less than the depth of the gap when the seal is in its original state.

[0017] Optionally, a contact interface between the first protrusion and the second protrusion is offset from a surface of the sealing member.

[0018] Optionally, the circumferential surfaces of the first protrusion and the second protrusion are both in close contact with the first sealing ring and the second sealing ring.

[0019] The present application also proposes a fuel cell, comprising the fuel cell stack assembly as described above.

[0020] In the technical solution of the present application, the first sealing ring is arranged at the flow channel edge of the coolant flow channel area to seal the coolant flow channel area; the second sealing ring is arranged at the length edge of the plate body; therefore, after the monopolar plate assembly of one of the two adjacent single cells is pressed together with the conductive electrode plate of the other, the seal forms a double annular sealing area (first sealing ring and second sealing ring) between the two plates, forming a double sealing effect. Moreover, a gap is provided between the first sealing ring and the second sealing ring, and since the first protrusion is embedded in the gap between the first sealing ring and the second sealing ring; therefore, after the monopolar plate assembly of one of the two adjacent single cells is pressed together with the conductive electrode plate of the other, the first protrusion on the monopolar plate assembly can contact and conduct electricity with the second protrusion of the other conductive electrode plate in the gap, which can effectively increase the conductive area. Therefore, the present application can increase the conductive area while ensuring the sealing effect.

[0021] In addition, when the first protrusion contacts the second protrusion of the other electrode plate, the seal can be prevented from being excessively deformed or too slightly deformed, thereby preventing the seal from being crushed during the stacking process, resulting in sealing failure or inability to form an effective seal due to weak sealing force.

[0022] In addition, when the sealing member is provided on the plate body by an integral molding process, the first protrusion can play a role in positioning the sealing member, thereby preventing the sealing member from being misplaced and causing sealing failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 Schematic diagram of the structure of the monopolar plate assembly provided in an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of a sealing member provided in an embodiment of the present application;

[0026] Figure 3 yes Figure 2 One of the structures in the partial enlarged view at A in the middle;

[0027] Figure 4 yes Figure 2 One of the structures in the partial enlarged view at A in the middle;

[0028] Figure 5 It is a partial structural diagram of the assembly structure of the cathode plate, anode plate and seal;

[0029] Figure 6 Schematic diagram of the structure of the anode plate provided in the embodiment of the present application;

[0030] Figure 7 Schematic diagram of the structure of the cathode plate provided in the embodiment of the present application;

[0031] Figure 8 Schematic diagram of the structure of a single battery stack according to an embodiment of the present application.

[0032] Reference Signs List

[0033] 1 Single battery 201 First sealing ring 10 Monopolar plate assembly 201a Peak 100 plate body 201b Tanibe 200 seals 202 Second sealing ring 300 cathode plate 202a Ring 400 membrane electrode assembly 202b Sealing protrusion 101 Runner area 202c gap 102 Runner edge 203 Connection 103 Length edge S3 gap 104 First bulge 301 Second bulge S1 First side 302 The third bulge S2 Second side DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0036] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to make and use the invention. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art will recognize that the invention can be practiced without these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0037] The core of the fuel cell is the stack assembly. In some preparation processes, the stack assembly is formed by stacking a plurality of single cells. Each single cell includes an anode plate, a cathode plate and a membrane electrode arranged between the two. Among them, between two adjacent single cells, there is a certain conductive contact area between the anode plate of one and the cathode plate of the other to ensure good conductivity. However, since the appropriate operating temperature has a great influence on the power generation efficiency, coolant (such as water or other liquids) needs to be passed between adjacent single cells, which requires that seals be provided between adjacent single cells to avoid leakage of coolant. However, the provision of seals will cause the conductive area of ​​the plates of two adjacent single cells to be reduced. Therefore, how to ensure a larger conductive area and a better sealing effect is a technical problem that needs to be solved urgently in this field.

[0038] Therefore, in order to improve both the sealing effect and the conductive effect, the embodiment of the present application first proposes a monopolar plate assembly.

[0039] Combine Figures 1 to 8 As shown, the embodiment of the present application provides a monopolar plate assembly 10, comprising:

[0040] A plate body 100 having a first side surface S1 on which a cooling liquid flow channel region 101 is formed along its length and a first protrusion 104 is provided outside the cooling liquid flow channel region 101; and

[0041] Seal 200. Figure 1 As shown, the sealing member 200 is provided on the first side surface S1. Figure 2As shown, the sealing member 200 includes a first sealing ring 201 and a second sealing ring 202. The first sealing ring 201 is arranged at the flow channel edge 102 of the coolant flow channel area 101 to seal the coolant flow channel area 101; the second sealing ring 202 is arranged around the first sealing ring 201 and is located at the length edge 103 of the plate body 100; Figure 3 and Figure 4 As shown, the first sealing ring 201 and the second sealing ring 202 are spaced apart in the width direction of the plate body 100 to form a gap S3; the first protrusion 104 is located in the gap S3.

[0042] In an embodiment, Figure 8 As shown, the monopolar plate assembly 10 is used to form a single cell 1 with the conductive electrode plate and the membrane electrode 400. Among them, when the single cell 1 is constructed as a battery stack assembly, the monopolar plate assembly 10 of one of the two adjacent single cells 1 constructs a coolant flow channel with the conductive electrode plate of the other single cell 1. And the seal 200 of the monopolar plate assembly 10 is used to seal the coolant flow channel to prevent coolant leakage. The first side S1 of the plate body 100 is constructed with a coolant flow channel area 101 and a first protrusion 104 arranged on the outside of the coolant flow channel area 101. The coolant flow channel area 101 is used to construct a coolant flow channel with the conductive electrode plate of another single cell 1. The first protrusion 104 is used to contact with the second protrusion 301 on the other conductive electrode plate to establish a conductive connection relationship.

[0043] In the technical solution of the present application, the first sealing ring 201 is disposed at the flow channel edge 102 of the coolant flow channel region 101 to seal the coolant flow channel region 101; the second sealing ring 202 is disposed at the longitudinal edge 103 of the plate body 100. After the monopolar plate assembly 10 of one of two adjacent single cells 1 is pressed together with the conductive plate of the other, the seal 200 forms a double annular sealing area (the first sealing ring 201 and the second sealing ring 202) between the two plates, achieving a double sealing effect. Furthermore, a gap S3 is provided between the first sealing ring 201 and the second sealing ring 202. Because the first protrusion 104 is embedded in the gap S3 between the first sealing ring 201 and the second sealing ring 202, after the monopolar plate assembly 10 of one of the two adjacent single cells 1 is pressed together with the conductive plate of the other, the first protrusion 104 on the monopolar plate assembly 10 can contact and conduct electricity with the second protrusion 301 of the other conductive plate within the gap S3, effectively increasing the conductive area. Therefore, the present application can ensure the sealing effect while also increasing the conductive area.

[0044] In the prior art, to improve the sealing effect, the seal 200 typically occupies an excessive amount of area on the two plates, which in turn limits the configuration of the conductive structures of the two plates, resulting in a reduction in the conductive area. However, in the present application, the first sealing ring 201 and the second sealing ring 202 have a dual sealing effect after compression, improving the sealing ability of the coolant flow channel. At the same time, a gap S3 is provided between the first sealing ring 201 and the second sealing ring 202. The first protrusion 104 on the plate body 100 is disposed within this gap S3, which can reserve sufficient space for the first protrusion 104 to be arranged, thereby increasing the conductive area.

[0045] In an embodiment, Figure 3 and Figure 4 As shown, the first sealing ring 201 and the second sealing ring 202 are both formed to extend along the length of the plate 100, and are separated by a gap S3 extending along the width of the plate 100. Compared to the prior art, where conductive protrusions on the plate 100 can only be arranged sporadically, within this gap S3, the plate 100 can be provided with a sufficient number of first protrusions 104, which can contact each other one-on-one with the second protrusions 301 on the conductive plate of another single battery cell 1, thereby providing a sufficiently large conductive area for both. Furthermore, the number of first protrusions 104 can be specifically set, which will not be elaborated here. In addition, in some embodiments, the first protrusions 104 can be configured as a strip-shaped structure extending along the length. Such a configuration of the first protrusions 104 can provide a larger conductive area.

[0046] As an optional implementation of the above embodiment, in order to further improve the sealing effect, the sealing member 200 also includes a connecting portion 203, which is arranged in the gap S3 and connects the first sealing ring 201 and the second sealing ring 202. In the embodiment, one end of the connecting portion 203 is connected to the first sealing ring 201, and the other end is connected to the second sealing ring 202, so as to connect the first sealing ring 201 and the second sealing ring 202 as a whole. When the sealing member 200 is squeezed, the first sealing ring 201 and the second sealing ring 202 can coordinately deform with the connecting portion 203, thereby reducing the crushing of the first sealing ring 201 and the second sealing ring 202, thereby improving the sealing ability. On the other hand, the connecting portion 203 can be used for auxiliary positioning during stacking, which can reduce the offset of two adjacent single cells 1.

[0047] In the technical solution of the embodiment, there can be multiple connecting parts 203, and the multiple connecting parts 203 are arranged at intervals along the length direction. It should be noted that in order to ensure both sealing and conductive effects, multiple first protrusions 104 can be provided between two adjacent connecting parts 203.

[0048] In an embodiment, the seal 200 can be integrally formed on the plate body 100 or bonded to the plate body 100. Generally speaking, the seal 200 is integrally injection-molded on the plate body 100 to form a monopolar plate assembly 10. As an optional implementation of the above embodiment, the first protrusion 104 is provided with a groove, and the connecting portion 203 is embedded in the groove. Generally speaking, there are multiple first protrusions 104. In the embodiment of the present application, a groove is provided on a portion of the first protrusions 104, so that during injection molding, the connecting portion 203 is formed in the groove, so that the connecting portion 203 has sufficient ability to support the first sealing ring 201 and the second sealing ring 202.

[0049] As an optional implementation of the above embodiment, in order to effectively improve the sealing ability of the first sealing ring 201, the side of the first sealing ring 201 facing away from the second sealing ring 202 has a plurality of peaks 201a protruding toward the coolant flow channel area 101 and a plurality of valleys 201b recessed away from the coolant flow channel area 101. The plurality of peaks 201a and the plurality of valleys 201b are arranged at intervals in the length direction, and two adjacent peaks 201a are connected by the valleys 201b. That is: in the technical solution of the present application, the side of the first sealing ring 201 facing the coolant flow channel area 101 is roughly in the shape of a wave, a sine curve or a cosine curve. The first sealing ring 201 has good deformation ability, and the first sealing ring 201 has a higher sealing strength after deformation.

[0050] As an alternative embodiment to the above embodiment, the second sealing ring 202 includes a ring body 202a and multiple sealing protrusions 202b. The ring body 202a extends along the length and is separated from the first sealing ring 201 by a gap S3. The multiple sealing protrusions 202b are disposed on the side of the ring body 202a facing away from the first sealing ring 201 and are spaced apart along the length, with the plate 100 exposed between two adjacent sealing protrusions 202b. In this embodiment, a third protrusion 302 is provided on the longitudinal edge 103 of the conductive plate of another single cell 1. The third protrusion 302 can be snapped into two adjacent sealing protrusions 202b to enhance the sealing strength between the conductive plate and the monopolar plate assembly 10 and prevent mutual displacement between the conductive plate and the monopolar plate assembly 10. Furthermore, the third protrusion 302 can contact the plate 100 exposed between two adjacent sealing protrusions 202b, further increasing the conductive area.

[0051] In the embodiment, the connecting portion 203 and the sealing protrusion 202b are generally arranged offset in the longitudinal direction. That is, the connecting portion 203 is disposed on the segments of two adjacent sealing protrusions 202b of the ring body 202a. When stacked, the deformation of the connecting portion 203 can cause the segments of the two adjacent sealing protrusions 202b of the ring body 202a to deform into the gap 202c thereof, thereby causing the sealing protrusion 202b and the ring body 202a to embrace the third protrusion 302. The third protrusion 302 provides support for the sealing protrusion 202b and the ring body 202a, thereby further improving the sealing strength.

[0052] This application also provides a single cell 1 comprising a conductive electrode plate, a membrane electrode 400, and a monopolar plate assembly 10. The monopolar plate assembly 10 utilizes some or all of the technical solutions of the aforementioned embodiments, thereby providing the conductive cell with some or all of the technical advantages of the aforementioned embodiments. The membrane electrode 400 is disposed between the conductive electrode plate and the monopolar plate assembly 10. Figure 6 and Figure 7 As shown, the plate body 100 in the monopolar plate assembly 10 has a second side surface S2 arranged opposite to the first side surface S1, and the membrane electrode 400 is arranged facing the second side surface S2.

[0053] In this embodiment, one of the conductive electrode plate and the monopolar plate in the monopolar plate assembly 10 is an anode plate, and the other is a cathode plate. Generally speaking, the monopolar plate in a monopolar plate assembly is an anode plate, and the conductive electrode plate is a cathode plate.

[0054] The membrane electrode 400 mainly includes a proton exchange membrane, an anode catalyst, a cathode catalyst layer, an anode gas diffusion layer, and a cathode gas diffusion layer. During operation, when hydrogen gas introduced into the anode plate reaches the anode catalyst layer through the anode gas diffusion layer, the hydrogen gas reacts after catalysis and produces hydrogen ions. The hydrogen ions pass through the proton exchange membrane and enter one side of the cathode plate 300, where they react with oxygen on the cathode side to form water, generating electricity during the above-mentioned redox reaction. Exemplarily, the proton exchange membrane can be a perfluorosulfonic acid membrane, a partially fluorinated polymer proton exchange membrane, a composite proton exchange membrane, or a non-fluorinated polymer proton exchange membrane.

[0055] The embodiment of the present application also proposes a battery stack assembly, comprising a plurality of stacked single cells 1. In two adjacent single cells 1, the conductive electrode plate of one and the monopolar plate assembly 10 of the other contact each other under the action of stacking pressure to form a coolant flow channel. Particularly, during pressing, the seal 200 on the monopolar plate assembly 10 is deformed so that the coolant flow channel is sealed. The conductive electrode plate has a second protrusion 301 arranged away from the membrane electrode 400; Particularly, the second protrusion 301 of the conductive electrode plate in the two adjacent single cells 1 contacts each other with the first protrusion 104 of the other monopolar plate assembly 10.

[0056] In this embodiment, when two battery cells 1 are positioned opposite each other and not yet stacked, the side of the seal 200 facing away from the monopolar plate contacts the conductive plate of the other battery cell 1. At this point, the first protrusion 104 and the second protrusion 301 are not in contact. That is, the combined heights of the first protrusion 104 and the second protrusion 301 are less than the depth of the gap S3 when the seal 200 is in its original state. When a stacking force is applied to two adjacent battery cells 1, the first protrusion 104 and the second protrusion 301 approach each other until they contact, causing the seal 200 to deform and generate a sealing force. In this embodiment, the difference between the combined heights of the first protrusion 104 and the second protrusion 301 and the depth of the gap S3 when the seal 200 is in its original state is designed. This difference controls the deformation of the seal 200, preventing excessive or insufficient deformation of the seal 200, thereby preventing the seal 200 from being crushed during stacking, resulting in seal failure, or preventing an ineffective seal due to insufficient sealing force. Therefore, in the battery stack assembly, the first protrusion 104 and the second protrusion 301 only contact each other when a pressing force is applied and can control the deformation of the seal 200, so as to ensure the conductivity of adjacent battery stacks while also ensuring the sealing effect of the coolant flow channel.

[0057] In the technical solutions of the embodiments of the present application, the difference between the sum of the heights of the first protrusion 104 and the second protrusion 301 and the depth of the gap S3 when the seal 200 is in its original state is specifically designed based on the sealing requirements, the elastic modulus of the seal 200, and other factors. It is sufficient that the seal 200 is in a reasonably deformed state when the first protrusion 104 and the second protrusion 301 contact. When designing, those skilled in the art can determine the sum of the heights of the first protrusion 104 and the second protrusion 301 and the depth of the gap S3 when the seal 200 is in its original state using finite element methods, experiments, and the like.

[0058] As an optional implementation of the above embodiment, the contact interface between the first protrusion 104 and the second protrusion 301 is offset from the surface of the seal 200. The surface of the seal 200 is the side of the seal 200 facing away from the monopolar plate. In two adjacent single cells 1, the seal 200 is located between one of the monopolar plates and the other conductive plate; wherein the first protrusion 104 on the monopolar plate is located in the gap S3 of the seal 200, and the second protrusion 301 on the conductive plate is embedded in the gap S3 of the seal 200, and contacts with the first protrusion 104 and the second protrusion 301 to determine the contact interface; the contact interface is located in the gap S3, but is offset from the surface of the seal 200, so that the surface of the seal 200 and the conductive plate can be in close contact, forming a good sealing effect.

[0059] As an alternative implementation of the above embodiment, Figure 5 As shown, the circumferential surfaces of the first protrusion 104 and the second protrusion 301 are both in close contact with the first sealing ring 201 and the second sealing ring 202. In an embodiment, the first sealing ring 201 and the second sealing ring 202 are squeezed and deformed when subjected to the stacking force, and the gap S3 between the deformed first sealing ring 201 and the second sealing ring 202 becomes narrower. The circumferential surfaces of the first protrusion 104 and the second protrusion 301 are both in close contact with the first sealing ring 201 and the second sealing ring 202, and thus the first protrusion 104 and the second protrusion 301 play a supporting role for the first sealing ring 201 and the second sealing ring 202 in the width direction, making the double sealing effect of the first sealing ring 201 and the second sealing ring 202 more prominent, and can effectively reduce the risk of coolant leakage.

[0060] The present application also provides a fuel cell including a stack assembly. The stack assembly adopts some or all of the technical solutions of the aforementioned embodiments, and thus has some or all of the technical advantages of the aforementioned embodiments, which will not be described in detail here.

[0061] The above is a detailed introduction to a monopolar plate assembly, a single cell, a stack assembly and a fuel cell provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A monopolar plate assembly, characterized in that: include: A plate body having a first side surface, the first side surface having a coolant flow channel area extending along the length thereof and a first protrusion located outside the coolant flow channel area; as well as A seal, wherein the seal is arranged on the first side surface; the seal includes a first sealing ring and a second sealing ring, the first sealing ring is arranged at the flow channel edge of the coolant flow channel area, and is used to seal the coolant flow channel area; the second sealing ring is arranged around the first sealing ring and is located at the length edge of the plate body; the first sealing ring and the second sealing ring are spaced apart in the width direction of the plate body to form a gap; the first protrusion is located in the gap.

2. The monopolar plate assembly according to claim 1, wherein: The sealing member further includes a connecting portion; the connecting portion is disposed in the gap and connects the first sealing ring and the second sealing ring.

3. The monopolar plate assembly according to claim 2, wherein: The first protrusion is provided with a groove, and the connecting portion is embedded in the groove.

4. The monopolar plate assembly according to claim 1, wherein: The side of the first sealing ring facing away from the second sealing ring has a plurality of peaks protruding toward the coolant flow channel area and a plurality of valleys recessed away from the coolant flow channel area. The plurality of peaks and the plurality of valleys are spaced apart in the length direction, and two adjacent peaks are connected by the valley.

5. The monopolar plate assembly according to claim 1, wherein: The second sealing ring includes a ring body and a plurality of sealing protrusions; the plurality of sealing protrusions are arranged on the side of the ring body facing away from the first sealing ring and are spaced apart in the length direction, and a gap is provided between two adjacent sealing protrusions to expose the plate body.

6. A single cell battery, characterized in that: include: Conductive electrode plate; membrane electrode; as well as The monopolar plate assembly according to any one of claims 1 to 5; the membrane electrode is arranged between the conductive electrode plate and the monopolar plate assembly; the plate body has a second side surface arranged opposite to the first side surface, and the membrane electrode is arranged facing the second side surface.

7. A fuel cell stack assembly, characterized in that: Comprising a plurality of stacked single cells according to claim 6; the conductive electrode plate has a second protrusion disposed away from the membrane electrode; the second protrusion of the conductive electrode plate of one of two adjacent single cells contacts the first protrusion of the other monopolar plate assembly; Wherein, the sum of the heights of the first protrusion and the second protrusion is less than the depth of the gap when the sealing member is in an original state.

8. The fuel cell stack assembly according to claim 7, wherein: A contact interface between the first protrusion and the second protrusion is offset from a surface of the sealing member.

9. The fuel cell stack assembly according to claim 7, wherein: The circumferential surfaces of the first protrusion and the second protrusion are both in close contact with the first sealing ring and the second sealing ring.

10. A fuel cell, characterized in that: Comprising the fuel cell stack assembly according to any one of claims 7 to 9.

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