End plate assembly of fuel cell stack and fuel cell stack

Abstract

The utility model discloses an end plate assembly of a fuel cell stack and the fuel cell stack, an insulating plate of the end plate assembly is provided with a plurality of pipe bodies, and the pipe bodies protrude out of the surface of one side of the insulating plate; the pipe body penetrates through the end plate in the thickness direction of the end plate; a first groove is formed in the surface of the other side of the insulating plate, and the collector plate is embedded in the first groove; and the end plate, the insulating plate and the collector plate are of an integrated packaging structure. By adopting the scheme, the integral end plate assembly is formed, the packaging structure of the galvanic pile is simplified, the number of assemblies is reduced, and the packaging efficiency of the galvanic pile is improved. Moreover, the redundant space between the assemblies is reduced, the volume and the weight of the fuel cell stack are reduced, and the requirements of portability and transportation are met. And moreover, the connection strength between the assemblies is enhanced, potential fault points are reduced, and the performance stability of the fuel cell is improved. And moreover, batch production is facilitated, so that the production cost of the fuel cell is reduced.

Description

Technical Field

[0001] The utility model relates to the field of fuel cells, and in particular to an end plate assembly of a fuel cell stack and a fuel cell stack. Background Art

[0002] The main structure of a traditional fuel cell stack includes a front end plate, an insulating plate, a current collector, a battery cell, a current collector, an insulating plate, and a rear end plate, which are compressed in sequence and then fastened with screws. The battery cell is composed of multiple sets of bipolar plates and membrane electrodes, thus forming a fuel cell stack. The front end plate of the stack is provided with inlets and outlets for air, hydrogen, and coolant, and air, hydrogen, and coolant are all independent cavities. Sealing strips are placed at the connection interfaces of the inlets and outlets of the front end plate and the insulating plate, and the insulating plate and the current collector to prevent leakage between the contact surfaces of the components.

[0003] However, the packaging method of the traditional fuel cell stack is often complex in structure and has many components, which not only increases the difficulty and cost of manufacturing, but may also affect the performance and stability of the fuel cell. For mobile applications or transportation scenarios, the volume and weight of the fuel cell are key factors; traditional packaging methods often result in large fuel cells and excessive weight, limiting their scope of application. In addition, the packaging structure has a direct impact on the performance stability of the fuel cell; if the packaging is improper, it may cause the fuel cell performance to deteriorate or malfunction. In addition, the widespread application of fuel cells is limited by their high cost. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art that the packaging of fuel cell stacks is complex, which affects the battery performance, causes large battery volume and leads to high battery cost, and to provide an end plate assembly of a fuel cell stack and a fuel cell stack.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] An end plate assembly of a fuel cell stack, the end plate assembly comprising an end plate, an insulating plate and a current collecting plate arranged in sequence,

[0007] The insulating plate has a plurality of tubes, the tubes protrude from the surface of one side of the insulating plate; and in the thickness direction of the end plate, the tubes penetrate the end plate; the surface of the other side of the insulating plate has a first groove, and the current collecting plate is embedded in the first groove;

[0008] The end plate, the insulating plate and the current collecting plate are an integrated packaging structure.

[0009] In this solution, the tube body of the insulating plate passes through the end plate and is connected to the end plate; the current collecting plate is embedded in the surface of the insulating plate, so as to facilitate the packaging between the end plate, the insulating plate and the current collecting plate, thereby forming an integrated end plate assembly. When the fuel cell stack is packaged, the end plate assembly can be assembled with the battery cell, thereby simplifying the packaging structure of the stack, reducing the number of components, and improving the packaging efficiency of the stack. In addition, through the above structural arrangement for packaging, the redundant space between components is reduced, the volume and weight of the fuel cell stack are reduced, and the requirements of portability and transportation are met. In addition, through the packaging structure, the connection strength between components is enhanced, the potential failure points are reduced, and the performance stability of the fuel cell is improved. Furthermore, the integrated packaging structure not only simplifies the production process, but also facilitates mass production, thereby reducing the production cost of fuel cells and creating conditions for their wide application.

[0010] Preferably, the end plate is provided with a through hole, and the through hole is used for the tube body to pass through; the seal between the insulating plate and the end plate is arranged between the tube body and the through hole.

[0011] In this solution, compared with setting a seal between the surfaces of the insulating plate and the end plate, setting the seal between the insulating plate and the end plate between the tube body and the through hole can further reduce the redundant space between the insulating plate and the end plate, and also facilitate the packaging operation of the end plate assembly.

[0012] Preferably, the seal between the tube body and the through hole includes at least one of a radial seal and an end face seal.

[0013] In this solution, radial seals and / or end face seals are provided between the tube body and the through hole, so that reliable sealing between the tube body and the through hole can be achieved, and the fluid in the tube body can only contact the insulating plate, thereby preventing metal ions from mixing into the fluid.

[0014] Preferably, the radial seal comprises a radial sealing ring, and the radial sealing ring is arranged between the circumferential outer surface of the tube body and the inner surface of the through hole.

[0015] In this solution, a radial sealing ring is provided between the circumferential outer surface of the tube body and the inner surface of the through hole, thereby achieving radial sealing between the tube body and the through hole. This method is simple to implement, has reliable sealing, and is also conducive to packaging operations.

[0016] Preferably, the end face seal comprises an end face sealing ring, and the end face sealing ring is arranged on the edge of the end surface of the tube body.

[0017] In this solution, an end face sealing ring is provided on the edge of the end surface of the tube body, and after being assembled with the end plate, an end face seal can be formed. This method is simple to implement, has reliable sealing, and is also conducive to packaging operations.

[0018] Preferably, a second groove is provided on the circumferential outer surface of the tube body, and the radial sealing ring is arranged in the second groove.

[0019] In this solution, the second groove can facilitate the installation and positioning of the radial sealing ring and facilitate the formation of a radial seal after the packaging operation.

[0020] Preferably, a trapezoidal groove is provided on the surface of the end of the tube body, and the end face sealing ring is arranged in the trapezoidal groove.

[0021] In this solution, the end face sealing ring can be reliably installed in the trapezoidal groove through the trapezoidal groove, so as to avoid the end face sealing ring being separated from the tube body during packaging, and realize the end face sealing between the tube body and the insulating plate.

[0022] Preferably, the plurality of pipe bodies are respectively a hydrogen inlet pipe, a hydrogen outlet pipe, a coolant inlet pipe, a coolant outlet pipe, an air inlet pipe and an air outlet pipe;

[0023] In the length direction of the insulating plate, the hydrogen inlet pipe, the coolant inlet pipe and the air inlet pipe are arranged at one end of the insulating plate; the hydrogen outlet pipe, the coolant outlet pipe and the air outlet pipe are arranged at the other end of the insulating plate.

[0024] Preferably, the current collecting plate has a tab, and the tab is bent from an edge of the current collecting plate toward the insulating plate and mounted on the insulating plate.

[0025] In this solution, the tab is bent and connected to the insulating plate, which facilitates the lead-out and packaging operations of the tab and can also achieve a reliable connection between the tab and the insulating plate.

[0026] Preferably, a bending portion is provided on an edge of the insulating plate, the bending portion is bent toward the end plate and fits with a side surface of the end plate; the pole lug is connected to the bending portion by a fastener.

[0027] In this solution, the bent portion is connected to the end plate, and the bent portion can be used as a mounting component for the pole ear, which can prevent the pole ear from directly contacting the metal end plate and affecting the current collection effect. When the bent portion is connected to the end plate, the connection can be achieved through a packaging operation.

[0028] Preferably, there is a gap between the bending portion and the first groove, and the tab is fitted with the bending portion via the gap.

[0029] In this solution, by providing a notch, the tab can extend from the bottom of the first groove along the surface of the bent portion and bend, thereby fitting tightly with the bent portion to achieve a reliable connection between the tab and the bent portion.

[0030] Preferably, the fuel cell stack includes a polar plate, and the length of the current collecting plate is smaller than the length of the polar plate.

[0031] In this solution, the size of the current collecting plate is reduced, which not only reduces the cost, but also allows the fluid to avoid contact with the current collecting plate and bring metal ions into the battery stack.

[0032] A fuel cell stack comprises an end plate assembly of the fuel cell stack as described above, the fuel cell stack also comprises a battery cell, and the end plate assembly is connected to one end of the battery cell.

[0033] In this solution, when the fuel cell stack is packaged, the end plate assembly of the integrated package can be assembled with the battery cell, thereby simplifying the packaging structure of the stack, reducing the number of components, and improving the packaging efficiency of the stack. In addition, by packaging through the above structural arrangement, the redundant space between components is reduced, the volume and weight of the fuel cell stack are reduced, and the requirements of portability and transportation are met. In addition, through the packaging structure, the connection strength between components is enhanced, the potential failure points are reduced, and the performance stability of the fuel cell is improved. Furthermore, the integrated packaging structure not only simplifies the production process, but also facilitates mass production, thereby reducing the production cost of fuel cells and creating conditions for their widespread application.

[0034] The positive and progressive effects of the utility model are: the tube body of the insulating plate passes through the end plate and is connected to the end plate; the current collecting plate is embedded in the surface of the insulating plate, so as to facilitate the packaging between the end plate, the insulating plate and the current collecting plate, thereby forming an integrated end plate assembly. When the fuel cell stack is packaged, the end plate assembly can be assembled with the battery cell, thereby simplifying the packaging structure of the stack, reducing the number of components, and improving the packaging efficiency of the stack. In addition, through the above structural arrangement for packaging, the redundant space between components is reduced, the volume and weight of the fuel cell stack are reduced, and the requirements of portability and transportation are met. In addition, through the packaging structure, the connection strength between components is enhanced, the potential failure points are reduced, and the performance stability of the fuel cell is improved. Furthermore, the integrated packaging structure not only simplifies the production process, but also facilitates mass production, thereby reducing the production cost of fuel cells and creating conditions for their wide application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the three-dimensional structure of an end plate assembly provided in an embodiment of the utility model, wherein the end plate, the insulating plate and the current collecting plate in the end plate assembly are arranged separately;

[0036] Figure 2 A schematic diagram of the three-dimensional structure of an end plate assembly provided in an embodiment of the utility model, wherein the end plate, the insulating plate and the current collecting plate in the end plate assembly are packaged into one body;

[0037] Figure 3 A schematic diagram of a plane of an end plate assembly provided by an embodiment of the utility model;

[0038] Figure 4 A schematic diagram of a three-dimensional structure of an insulating plate provided by an embodiment of the utility model from one viewing angle;

[0039] Figure 5 A schematic diagram of the three-dimensional structure of the insulation board provided by the embodiment of the utility model from another perspective;

[0040] Figure 6 A schematic diagram of another plane of the end plate assembly provided by an embodiment of the utility model;

[0041] Figure 7 for Figure 6 Sectional view at AA in the middle;

[0042] Figure 8 for Figure 6 Sectional view at the middle BB;

[0043] Fig. 9 for Figure 7 A partial enlarged view of point C in the middle;

[0044] Fig.10 for Figure 4 A partial enlarged view of point D in the middle;

[0045] Fig.11 A schematic diagram of a three-dimensional structure of a fuel cell stack provided by an embodiment of the utility model, wherein the end plate assembly is separated from the battery cell;

[0046] Fig.12 A schematic diagram of a three-dimensional structure of a fuel cell stack provided by an embodiment of the utility model, wherein the end plate assembly and the battery cell are assembled into one;

[0047] Fig.13 for Fig.11 Schematic diagram of the structure of another end plate assembly in the fuel cell stack.

[0048] Description of reference numerals:

[0049] Fuel cell stack 1, end plate assembly 10, battery cell 20, second end plate assembly 30, end plate 100, through hole 110, third groove 120, insulating plate 200, tube body 210, hydrogen inlet pipe 211, hydrogen outlet pipe 212, coolant inlet pipe 213, coolant outlet pipe 214, air inlet pipe 215, air outlet pipe 216, radial sealing ring 221, end face sealing ring 222, bending portion 230, first groove 240, notch 250, collector plate 300, pole ear 310, fastener 400, special-shaped sealing ring 500, sealing gasket 600. DETAILED DESCRIPTION

[0050] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0051] The present invention provides an end plate assembly 10 of a fuel cell stack 1. The end plate assembly 10 is a component connected to the end of a battery cell 20. Figure 1-Figure 5 As shown, the end plate assembly 10 includes an end plate 100, an insulating plate 200 and a current collecting plate 300 arranged in sequence. The insulating plate 200 has a plurality of tubes 210, and the tubes 210 protrude from the surface of one side of the insulating plate 200; and in the thickness direction of the end plate 100, the tubes 210 penetrate the end plate 100; the surface of the other side of the insulating plate 200 has a first groove 240, and the current collecting plate 300 is embedded in the first groove 240; the end plate 100, the insulating plate 200 and the current collecting plate 300 are an integrated packaging structure.

[0052] The tube body 210 of the insulating plate 200 passes through the end plate 100 and is connected to the end plate 100; the current collecting plate 300 is embedded in the surface of the insulating plate 200, so as to facilitate the packaging between the end plate 100, the insulating plate 200 and the current collecting plate 300, thereby forming an integral end plate assembly 10. When the fuel cell stack is packaged, the end plate assembly 10 can be assembled with the battery cell 20, thereby simplifying the packaging structure of the stack, reducing the number of components, and improving the packaging efficiency of the stack. In addition, the packaging is performed through the above structural arrangement, reducing the redundant space between the components, realizing the reduction of the volume and weight of the fuel cell stack 1, and meeting the requirements of portability and transportation. In addition, through the packaging structure, the connection strength between the components is enhanced, the potential failure points are reduced, and the performance stability of the fuel cell is improved. Furthermore, the integrated packaging structure not only simplifies the production process, but also facilitates mass production, thereby reducing the production cost of the fuel cell and creating conditions for its wide application.

[0053] like Figure 2 As shown, the end plate 100, the insulating plate 200 and the current collecting plate 300 are packaged together to form an integral component. The end plate 100 is usually a metal component, preferably an aluminum alloy; the current collecting plate 300 is a gold-plated component. The insulating plate 200 can insulate the current collecting plate 300 from the end plate 100. Figure 4 As shown, each tube body 210 on the insulating plate 200 has a channel inside, and the channel runs through the thickness direction of the insulating plate 200. In a specific implementation, each channel can be used as a hydrogen inlet and outlet, a coolant inlet and outlet, and an air inlet and outlet. Figure 5As shown, the first groove 240 is set on the surface of the insulating plate 200, and when the current collecting plate 300 is set in the first groove 240, the outer surface of the current collecting plate 300 can be substantially flush with the surface where the first groove 240 is located, and the current collecting plate 300 and the first groove 240 are directly embedded, and no sealing member is required. Figure 1 As shown, the position of the first groove 240 is staggered with the above-mentioned channel to avoid the current collecting plate 300 overlapping with the channel and affecting the current collecting effect.

[0054] The integrated packaging means that the end plate 100, the insulating plate 200 and the current collecting plate 300 are integrated into one piece. In specific implementation, the end plate 100, the insulating plate 200 and the current collecting plate 300 can be processed separately by a mechanical processing method and then assembled into an integrated end plate assembly 10; the end plate 100 and the current collecting plate 300 can also be processed separately, and then the end plate 100 and the current collecting plate 300 are combined together by injection molding insulation to form an integrated end plate assembly 10.

[0055] like Figure 1 As shown, the end plate 100 is provided with a through hole 110, and the through hole 110 is used for the tube body 210 to pass through; the seal between the insulating plate 200 and the end plate 100 is arranged between the tube body 210 and the through hole 110. Compared with setting a seal between the insulating plate 200 and the surface of the end plate 100, setting the seal between the insulating plate 200 and the end plate 100 between the tube body 210 and the through hole 110 can further reduce the redundant space between the insulating plate 200 and the end plate 100, and also facilitate the packaging operation of the end plate assembly 10. Figure 7 and Fig. 9 As shown, the surface of the insulating plate 200 is closely attached to the surface of the end plate 100, and the tube body 210 extends into the corresponding through hole 110. The inner diameter of the through hole 110 is adapted to the outer diameter of the corresponding tube body 210, and the end surface of the tube body 210 is substantially flush with the end surface of the end plate 100.

[0056] like Figure 6 , Figure 7 and Fig. 9 As shown, the seal between the tube body 210 and the through hole 110 includes at least one of a radial seal and an end face seal. The radial seal and / or the end face seal are arranged between the tube body 210 and the through hole 110, so that a reliable seal between the tube body 210 and the through hole 110 can be achieved, and the fluid in the tube body 210 can only contact the insulating plate 200, thereby avoiding the mixing of metal ions into the fluid. Among them, the radial seal refers to the seal between the tube body 210 and the through hole 110 in the radial direction of the tube body 210, and the end face seal refers to the seal between the end face of the tube body 210 and the end face of the end plate 100. In a specific implementation, the seal between the tube body 210 and the through hole 110 preferably includes both a radial seal and an end face seal, so that the seal between the insulating plate 200 and the end plate 100 is more reliable.

[0057] like Figure 7 and Fig. 9 As shown, the radial seal includes a radial seal ring 221, and the radial seal ring 221 is arranged between the circumferential outer surface of the tube body 210 and the inner surface of the through hole 110. By arranging the radial seal ring 221 between the circumferential outer surface of the tube body 210 and the inner surface of the through hole 110, the radial seal between the tube body 210 and the through hole 110 is achieved. This method is simple to implement, reliable in sealing, and is also conducive to packaging operations.

[0058] like Figure 4 and Fig.10 As shown, the circumferential outer surface of the tube body 210 is provided with a second groove, and the radial sealing ring 221 is arranged in the second groove. It is convenient to install and position the radial sealing ring 221, and to form a radial seal after the packaging operation. The radial sealing ring 221 is arranged at the middle of the axial direction of the tube body 210. When the radial sealing ring 221 is installed in the second groove, the radial sealing ring 221 can protrude from the circumferential outer surface of the tube body 210, so that when the tube body 210 is assembled into the through hole 110, the radial sealing ring 221 can be squeezed between the tube body 210 and the through hole 110.

[0059] like Figure 7 and Fig. 9 As shown, the end face seal includes an end face seal ring 222, which is arranged at the edge of the end surface of the tube body 210. By arranging the end face seal ring 222 at the edge of the end surface of the tube body 210, after being assembled with the end plate 100, an end face seal can be formed. This method is simple to implement, has reliable sealing, and is also conducive to packaging operations.

[0060] like Figure 4 and Fig.10 As shown, the surface of the end of the tube body 210 is provided with a trapezoidal groove, and the end face sealing ring 222 is arranged in the trapezoidal groove. The end face sealing ring 222 can be reliably installed in the trapezoidal groove to prevent the end face sealing ring 222 from being separated from the tube body 210 during packaging, and to achieve the end face sealing between the tube body 210 and the insulating plate 200. Fig. 9 As shown, the end of the tube body 210 is substantially flush with the surface of the end plate 100 , the short side of the trapezoidal groove is located at the end face of the tube body 210 , and the through hole 110 is a hole with a uniform inner diameter, so that the end face sealing ring 222 can be embedded between the trapezoidal groove and the through hole 110 .

[0061] like Figure 3 and Figure 4As shown, six tube bodies 210 are provided on the insulating plate 200, namely a hydrogen inlet pipe 211, a hydrogen outlet pipe 212, a coolant inlet pipe 213, a coolant outlet pipe 214, an air inlet pipe 215 and an air outlet pipe 216; in the length direction of the insulating plate 200, the hydrogen inlet pipe 211, the coolant inlet pipe 213 and the air inlet pipe 215 are arranged at one end of the insulating plate 200; the hydrogen outlet pipe 212, the coolant outlet pipe 214 and the air outlet pipe 216 are arranged at the other end of the insulating plate 200.

[0062] like Figure 5 As shown, the first groove 240 is arranged in the middle of the insulating plate 200, and on the surface where the first groove 240 is located, each of the above inlet pipes and each of the outlet pipes is provided with a special-shaped sealing ring 500.

[0063] like Figure 1 , Figure 2 and Figure 8 As shown, the current collecting plate 300 has a tab 310, which is bent from the edge of the current collecting plate 300 toward the insulating plate 200 and mounted on the insulating plate 200. Thus, the tab 310 is easily led out and packaged, and a reliable connection between the tab 310 and the insulating plate 200 can be achieved.

[0064] like Figure 1 , Figure 5 and Figure 8 As shown, the edge of the insulating plate 200 is provided with a bending portion 230, which is bent toward the end plate 100 and fits with the side of the end plate 100; the pole ear 310 is connected to the bending portion 230 by a fastener 400. The bending portion 230 is connected to the end plate 100, and the bending portion 230 can be used as a mounting component of the pole ear 310, which can prevent the pole ear 310 from directly contacting the metal end plate 100 and affecting the current collection effect. And when the bending portion 230 is connected to the end plate 100, the connection can be achieved through a packaging operation. In a specific implementation, the fastener 400 can be a screw.

[0065] like Figure 1 As shown, a third groove 120 is provided at the edge of the end plate 100, and the bent portion 230 is bent toward the third groove 120 at the edge of the insulating plate 200 and is disposed in the third groove 120. The surface of the bent portion 230 at the first groove 240 is flush with the groove bottom of the first groove 240, as shown in FIG. Figure 5 As shown, there is a gap 250 between the bending portion 230 and the first groove 240. Figure 8 As shown, when the current collecting plate 300 is embedded in the first groove 240, the tab 310 extends from the notch 250 and fits on the surface of the bent portion 230. A protruding sealing gasket 600 is also provided on the outer surface of the current collecting plate 300.

[0066] like Fig.11 and Fig.12 As shown, the fuel cell stack 1 includes a plate, and the length of the current collecting plate 300 is smaller than the length of the plate. Thus, the size of the current collecting plate 300 is reduced, which not only reduces the cost, but also allows the fluid to avoid contact with the current collecting plate 300, bringing metal ions into the stack.

[0067] The utility model also provides a fuel cell stack 1, such as Fig.11 and Fig.12 As shown, the fuel cell stack 1 includes the end plate assembly 10 of the fuel cell stack 1 as described above, and the fuel cell stack 1 also includes a battery cell 20 , and the end plate assembly 10 is connected to one end of the battery cell 20 .

[0068] When the fuel cell stack is packaged, the end plate assembly 10 of the integrated package can be assembled with the battery cell 20, thereby simplifying the packaging structure of the stack, reducing the number of components, and improving the packaging efficiency of the stack. In addition, by packaging through the above structural arrangement, the redundant space between components is reduced, the volume and weight of the fuel cell stack 1 are reduced, and the requirements of portability and transportability are met. In addition, through the packaging structure, the connection strength between components is enhanced, the potential failure points are reduced, and the performance stability of the fuel cell is improved. Furthermore, the integrated packaging structure not only simplifies the production process, but also facilitates mass production, thereby reducing the production cost of fuel cells and creating conditions for their wide application.

[0069] like Fig.11 and Fig.12 As shown, the end plate assembly 10 is disposed at one end of the battery cell 20, and a second end plate assembly 30 is disposed at the other end of the battery cell 20. Fig.13 As shown, the second end plate assembly 30 may also be integrated into one assembly by being packaged integrally, wherein the current collecting plate 300 may be embedded in the insulating plate 200 , and the insulating plate 200 may be embedded in the end plate 100 .

[0070] When manufacturing the fuel cell stack 1, the specifications and performance requirements of the fuel cell can be determined first. The integrated second end plate assembly 30 is placed and positioned on the stack press, and the bipolar plates and membrane electrodes are assembled alternately into battery cells 20 one by one using external positioning rods or internal positioning rods. After the battery cells 20 are stacked, the integrated end plate assembly 10 is placed. The second end plate assembly 30, the battery cells 20 and the end plate assembly 10 are packaged in an integrated manner, which can be achieved by special adhesives, welding or other mechanical fixing methods. During the packaging process, ensure that the positions of each component are accurate to prevent displacement or damage. After the packaging is completed, check to ensure that there are no air leaks, electric leakage or other potential problems.

[0071] The end plate assembly 10 may be pre-packaged as a whole, and the packaging process may include: placing the insulating plate 200 on the end plate 100, ensuring that the insulating plate 200 is intact to prevent current short circuit. Installing the current collecting plate 300, ensuring that it is tightly connected to the insulating plate 200, to achieve effective current collection and distribution.

[0072] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. An end plate assembly for a fuel cell stack, characterized in that: The end plate assembly comprises an end plate, an insulating plate and a current collecting plate which are arranged in sequence. The insulating plate has a plurality of tubes, the tubes protrude from the surface of one side of the insulating plate; and in the thickness direction of the end plate, the tubes penetrate the end plate; the surface of the other side of the insulating plate has a first groove, and the current collecting plate is embedded in the first groove; The end plate, the insulating plate and the current collecting plate are an integrated packaging structure.

2. The end plate assembly of a fuel cell stack according to claim 1, characterized in that: The end plate is provided with a through hole, and the through hole is used for the tube body to pass through; the seal between the insulating plate and the end plate is provided between the tube body and the through hole; Furthermore, the seal between the tube body and the through hole includes at least one of a radial seal and an end face seal.

3. The end plate assembly of a fuel cell stack according to claim 2, characterized in that: The radial seal comprises a radial sealing ring, and the radial sealing ring is arranged between the circumferential outer surface of the tube body and the inner surface of the through hole; The end face seal comprises an end face seal ring, and the end face seal ring is arranged on the edge of the end surface of the tube body.

4. The end plate assembly of a fuel cell stack according to claim 3, characterized in that: A second groove is formed on the circumferential outer surface of the tube body, and the radial sealing ring is arranged in the second groove; And / or, a trapezoidal groove is provided on the surface of the end of the tube body, and the end face sealing ring is arranged in the trapezoidal groove.

5. The end plate assembly of a fuel cell stack according to any one of claims 1 to 4, characterized in that: The multiple pipe bodies are respectively a hydrogen inlet pipe, a hydrogen outlet pipe, a coolant inlet pipe, a coolant outlet pipe, an air inlet pipe and an air outlet pipe; In the length direction of the insulating plate, the hydrogen inlet pipe, the coolant inlet pipe and the air inlet pipe are arranged at one end of the insulating plate; the hydrogen outlet pipe, the coolant outlet pipe and the air outlet pipe are arranged at the other end of the insulating plate.

6. The end plate assembly of a fuel cell stack according to claim 1, characterized in that: The current collecting plate has a pole ear, and the pole ear is bent from the edge of the current collecting plate toward the insulating plate and installed on the insulating plate.

7. The end plate assembly of a fuel cell stack according to claim 6, characterized in that: The edge of the insulating plate is provided with a bending portion, the bending portion is bent toward the end plate and fits with the side surface of the end plate; the pole ear is connected to the bending portion by a fastener.

8. The end plate assembly of a fuel cell stack according to claim 7, characterized in that: A gap is provided between the bending portion and the first groove, and the tab is fitted with the bending portion via the gap.

9. The end plate assembly of a fuel cell stack according to claim 1, characterized in that: The fuel cell stack includes a polar plate, and the length of the current collecting plate is smaller than the length of the polar plate.

10. A fuel cell stack, characterized in that: The fuel cell stack comprises an end plate assembly of the fuel cell stack as claimed in any one of claims 1 to 9, and the fuel cell stack further comprises a battery cell, wherein the end plate assembly is connected to one end of the battery cell.

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