Fuel cell stack, fuel cell system and vehicle

Abstract

The present invention discloses a fuel cell stack, a fuel cell system and a vehicle, which solves the technical problem of increased cost caused by changing the fastening scheme. The fuel cell stack includes an intake end plate and a blind end plate assembly, and also includes n fasteners and 2n fastening joints, where n≥2. The n fasteners are distributed on at least two opposite sides of the fuel cell stack; the fasteners are pull rods and / or steel belts. The 2n fastening joints are respectively connected to the two ends of the n fasteners; the fastening joints include a connected mounting portion and a connecting portion, and the connecting portion is connected to the fasteners; the sides of the intake end plate and the blind end plate assembly are both provided with mounting positions, and the mounting portion is provided in the mounting position and is connected to the intake end plate or the blind end plate assembly through a connector with a stacking direction projection component, and the universal connection of pull rod type fastening and steel belt type fastening on the stack body is achieved through the fastening joint.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell technology, and in particular to a fuel cell stack, a fuel cell system and a vehicle. Background Art

[0002] A proton exchange membrane fuel cell (PEMFC) is a power generation device that directly converts the chemical energy of fuel into electrical energy. It has the advantages of low operating temperature, fast startup, high specific power, simple structure and easy operation. Therefore, fuel cells are widely used in the automotive industry, energy generation, shipbuilding industry, aerospace, household power supply and other industries.

[0003] However, due to the different power demands in the market and the high cost of fuel cell stacks, in the existing technology, the research and development of fuel cell stacks requires improvements in the design stage and the implementation development stage, so that the fastening solution moves closer to the optimal implementation direction. The improvement or redesign of the fastening solution leads to technical problems with high engineering costs. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the purpose of the present invention is to overcome the shortcomings of the existing technology and provide a fuel cell stack, a fuel cell system and a vehicle, which realize the universal connection of pull rod type fastening and steel belt type fastening on the stack body, and solve the technical problem of increased cost caused by changing the fastening scheme.

[0005] The solution for achieving the technical objectives of the present invention is a fuel cell stack, comprising an intake end plate and a blind end plate assembly distributed at both ends of the fuel cell stack along the stacking direction of the fuel cell stack; and further comprising:

[0006] n fasteners, n≥2, the n fasteners being distributed on at least two opposite sides of the fuel cell stack; the fasteners being tie rods and / or steel strips;

[0007] 2n fastening joints, respectively connected to both ends of the n fasteners; the fastening joints include a connected mounting portion and a connecting portion, the connecting portion being connected to the fasteners;

[0008] Among them, mounting positions are provided on the sides of the air intake end plate and the blind end plate assembly, and the mounting portion is provided in the mounting position and is connected to the air intake end plate or the blind end plate assembly through a connector having a stacking direction projection component.

[0009] In some embodiments, the connecting portion is vertically disposed at a middle portion of the mounting portion, and the connecting portion is parallel to the stacking direction.

[0010] In some embodiments, the mounting position is a recessed groove that matches the shape of the fastening joint; and / or, the end face of the air intake end plate / blind end plate assembly is a stepped surface, the step surface of the stepped surface constitutes the mounting position, and the side of the air intake end plate / blind end plate assembly is provided with a through hole for the connecting portion to pass through.

[0011] In certain embodiments, the fastener is a pull rod, and the pull rod and the fastening joint are an integrated structure; and / or the fastener is a steel strip, and the steel strip is welded to the connecting portion.

[0012] In some embodiments, the connecting member is parallel to the stacking direction; and outer side surfaces of the mounting portion and the connecting portion are coplanar.

[0013] In certain embodiments, the connecting member is a bolt, and the head of the bolt abuts against the surface of the inlet end plate / blind end plate assembly close to the core.

[0014] In certain embodiments, the fuel cell stack further includes an insulating support member disposed between the core of the fuel cell stack and the fastener.

[0015] In certain embodiments, a limiting structure is provided on the fastener and / or the insulating support; and / or the insulating support has a recessed groove, and the fastener is interference-fitted with the recessed groove.

[0016] Based on the same inventive concept, the present invention also provides a fuel cell system including the above-mentioned fuel cell stack.

[0017] Based on the same inventive concept, the present invention also provides a vehicle comprising the above-mentioned fuel cell system.

[0018] It can be seen from the above technical solution that the present invention provides a fuel cell stack, including an air intake end plate and a blind end plate assembly distributed at both ends of the fuel cell stack along the stacking direction of the fuel cell stack. The fuel cell stack also includes n fasteners and 2n fastening joints, n≥2. Wherein, the n fasteners are distributed on at least two opposite sides of the fuel cell stack; the fasteners are pull rods and / or steel belts, and appropriate fastening methods can be selected and arranged according to the fastening requirements of the stack. 2n fastening joints are respectively connected to the two ends of the n fasteners; the fastening joint includes a connected mounting portion and a connecting portion, and the connecting portion is connected to the fastener, that is, the fastening joint can be applicable to the structures of two different fasteners, pull rods and steel belts. The sides of the air intake end plate and the blind end plate assembly are both provided with mounting positions, and the mounting portion is provided in the mounting position and is connected to the air intake end plate or the blind end plate assembly via a connector having a stacking direction projection component. On the one hand, the fastening joint is generally applicable to various parts of the fuel cell stack core that adopt tie rod fastening and / or steel belt welding fastening, such as the air intake end plate, air intake end insulation plate, air intake end current collecting plate, blind end current collecting plate, blind end insulation plate, blind end end plate and disc spring support plate, etc., so that the application of tie rods and steel belts can be easily switched, avoiding the need to redesign and verify the fastening parts after switching the fastening scheme, thereby achieving the commonality in design of the stack structural parts with the two fastening methods. On the other hand, the connector connects the fastening joint and the end plate along the direction having the stacking direction projection component, which is conducive to improving the volume power ratio of the fuel cell stack.

[0019] The fuel cell system and vehicle provided by the present invention, due to having the above-mentioned fuel cell stack, naturally have all the above-mentioned beneficial effects, and realize the universal fastening connection design of the two fasteners, the pull rod and the steel belt, so that the pull rod fastening scheme that is easy to assemble and has a stable stack can be universally switched with the lightweight steel belt fastening scheme, which is beneficial to the improvement of the scheme when the stack research and development stage turns to engineering development. Through the universal fastening joint structure, the operation of redesigning and verifying some parts is eliminated, which is beneficial to reducing development costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of an implementation structure of a fuel cell stack provided in Example 1 of the present invention;

[0021] Figure 2 This is a schematic diagram of another implementation structure of a fuel cell stack provided in Example 1 of the present invention;

[0022] Figure 3 for Figure 1 or Figure 2 A partial side view of the blind end of the fuel cell stack without the fastening joint installed;

[0023] Figure 4 for Figure 1 A partial schematic diagram of the blind end of the fuel cell stack installation fastening joint;

[0024] Figure 5 for Figure 4 A partial schematic diagram of the fuel cell stack installation fastening joints and tie rods;

[0025] Figure 6 for Figure 4 A partial schematic diagram of the fuel cell stack installation fastening joints and steel belts;

[0026] Figure 7 for Figure 1 A partial schematic diagram of the intake end of the fuel cell stack installation fastening joint;

[0027] Figure 8 for Figure 7 A partial schematic diagram of the fuel cell stack installation fastening joints and tie rods;

[0028] Figure 9 for Figure 7 A partial schematic diagram of the fuel cell stack installation fastening joints and steel belts;

[0029] Figure 10 for Figure 1 or Figure 2 A top view of a disc spring support plate of a blind end plate assembly of a fuel cell stack;

[0030] Figure 11 A schematic diagram of a first structure of a fastening joint, a tie rod and an insulating support member;

[0031] Figure 12 It is another structural schematic diagram of the fastening joint, the pull rod and the insulating support member;

[0032] Figure 13 for Figure 12 Assembly diagram of

[0033] Figure 14 A schematic diagram of a first structure of a steel strip and an insulating support member;

[0034] Figure 15 for Figure 14 Assembly diagram of

[0035] Figure 16 for Figure 15 side view.

[0036] Explanation of the reference numerals: 100 - fuel cell stack, 110 - air intake end plate, 120 - blind end end plate assembly, 121 - disc spring support plate, 122 - blind end end plate, 130 - fastener, 131 - pull rod, 132 - steel belt, 140 - fastening joint, 141 - mounting portion, 142 - connecting portion, 150 - mounting position, 160 - connecting piece, 170 - insulating support member. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to which this application belongs to understand this application more clearly, the technical solution of this application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0038] Existing fuel cell fastening solutions generally include screw, tie rod, and steel belt. The screw type has a simple structure and is easy to assemble and disassemble the stack, but it requires many fasteners and inconsistent tightening torque can cause uneven core fastening force, thus affecting stack performance. The tie rod type offers a stable stack structure and evenly distributed fastening force. The steel belt type has the lightest fastening parts.

[0039] During the research and development phase of a fuel cell stack, a fastening structure that is easy to assemble and provides stability is generally adopted. When transitioning to engineering development, lightweight solutions are generally chosen. However, if a switch in the fastening structure is not considered during the transition from research and development to engineering development, the stack becomes heavier, affecting the power-to-weight ratio and reducing its competitiveness. If a switch in the fastening structure is considered, some parts will need to be redesigned and verified, increasing engineering costs.

[0040] The inventive concept of this application is to design a fuel cell stack solution that is compatible with both tie-rod and welded steel strip types, in order to minimize the cost from research and development to engineering development while improving fuel cell stack competitiveness. By researching and designing tie-rod fastening solutions and steel strip fastening solutions, the two fastening solutions are made universal, allowing the same set of non-repetitive parts to be used for both tie-rod and welded steel strip types. This increases the flexibility of the fuel cell stack design and fastening solution selection, facilitating compatibility and switching between tie-rod and welded steel strip types.

[0041] Therefore, the present invention provides a fuel cell stack, a fuel cell system, and a vehicle that solves the technical problem of high engineering costs caused by the improvement or redesign of fastening solutions during the design and development stages. The following three specific embodiments provide a detailed description of the present invention:

[0042] Example 1

[0043] like Figures 1-16As shown, the present invention provides a fuel cell stack 100, comprising an air intake end plate 110 and a blind end plate assembly 120 distributed at both ends of the fuel cell stack 100 along the stacking direction of the fuel cell stack 100. The fuel cell stack 100 also includes n fasteners 130 and 2n fastening joints 140, where n≥2. The n fasteners 130 are distributed on at least two opposite sides of the fuel cell stack 100; the fasteners 130 are pull rods 131 and / or steel strips 132, and appropriate fastening methods can be selected and arranged according to the fastening requirements of the stack. The 2n fastening joints 140 are respectively connected to the two ends of the n fasteners 130; the fastening joints 140 include a connected mounting portion 141 and a connecting portion 142, and the connecting portion 142 is connected to the fastener 130, that is, the fastening joint 140 is applicable to the structures of two different fasteners 130, namely, the pull rod 131 and the steel strip 132. The sides of the air intake end plate 110 and the blind end plate assembly 120 are both provided with mounting positions 150, and the mounting portion 141 is arranged in the mounting position 150 and is connected to the air intake end plate 110 or the blind end plate assembly 120 through a connector 160 having a stacking direction projection component. On the one hand, the fastening joint 140 is commonly used for various parts of the fuel cell stack 100 core that are fastened by a pull rod 131 and / or a steel belt 132 welding fastening, such as the air intake end plate, the air intake end insulating plate, the air intake end collecting plate, the blind end collecting plate, the blind end insulating plate, the blind end end plate 122 and the disc spring support plate 121, etc., so that the application of the pull rod 131 and the steel belt 132 can be easily switched, avoiding the redesign and verification of the fastening parts after switching the fastening scheme, thereby realizing the design commonality of the stack structural parts with the two fastening methods. On the other hand, the connecting member 160 connects the fastening joint 140 and the end plate along a direction having a stacking direction projection component, which is beneficial to improving the volume power ratio of the fuel cell stack 100.

[0044] In order to ensure uniform fastening force of the fuel cell stack 100 , preferably, the number n of the fasteners 130 is ≥ 4, and they are distributed on at least two side surfaces of the long side of the fuel cell stack 100 .

[0045] The present invention does not specifically limit the form of the mounting position 150 on the intake end plate 110 and the blind end plate assembly 120. In some embodiments, the mounting position 150 can be a recessed groove that matches the shape of the fastening joint 140; and / or, the end face of the intake end plate 110 / disc spring support plate 121 is a stepped surface, and the stepped surface of the stepped surface constitutes the mounting position 150. The side of the intake end plate 110 / blind end end plate assembly 120 is provided with a through hole for the connecting portion 142 to pass through. When the latter stepped surface is adopted, the weight can be reduced and the volume power ratio can be improved at the same time.

[0046] To facilitate connection, preferably, the connector 160 is parallel to the stacking direction, that is, the tightening direction of the connector 160 is the same as the direction of the tightening force applied to the core by the fastener 130, which is beneficial to balance the tightening force of the fuel cell stack and reduce the space occupied by the connector 160 on the side of the core, which is beneficial to improving the volume power ratio.

[0047] In order to further improve the volume-to-power ratio, preferably, the outer side surfaces of the mounting portion 141 and the connecting portion 142 are coplanar.

[0048] In order to reduce the space occupied by the connector 160 on the end face of the core, make full use of the space created by the structure of the fuel cell stack 100, and improve the volume-to-power ratio, in this embodiment, the connector 160 is a bolt, and the head of the bolt abuts against the surface of the intake end plate 110 / blind end plate assembly 120 close to the core, that is, in this embodiment, through holes are designed on the intake end plate 110 and the disc spring support plate 121, and threaded through holes are designed on the fastening joint 140, and the tightening direction of the bolt is the stacking direction of the core.

[0049] In order to support the steel belt 132 and / or the pull rod 131 to prevent collapse and ensure insulation safety, in this embodiment, the fuel cell stack 100 also includes an insulating support 170, which is arranged between the core of the fuel cell stack 100 and the fastener 130.

[0050] In order to limit the relative position of the fastener 130 and the insulating support 170, in this embodiment, a limiting structure is provided on the fastener 130 and / or the insulating support 170; and / or the insulating support 170 has a recessed groove, and the fastener 130 is interference fit with the recessed groove.

[0051] This application does not impose specific limitations on the limiting structure; it only needs to stably position the insulating support member 170 between the core and the fastener 130 to prevent disengagement. In some embodiments, the limiting structure can be a groove and a boss. For example, a groove can be designed for the tie rod 131, and a boss can be designed for the insulating rod. The boss is placed in the groove, and the outer diameter of the boss is smaller than the inner diameter of the groove. This ensures that the tie rod 131 and the insulating rod are relatively fixed, while allowing the insulating rod to move slightly left and right.

[0052] In order to control the overall weight of the fuel cell stack 100 , the middle portion of the tie rod 131 may be hollowed out if strength permits, that is, a weight-reducing hole may be provided to reduce the weight.

[0053] The present invention does not specifically limit the connection method between the fastener 130 and the fastening joint 140. As a preferred embodiment, for the convenience of processing and the installation of the fastener 130, the fastener 130 is a tie rod 131, and the tie rod 131 and the fastening joint 140 are of an integral structure; and / or, the fastener 130 is a steel strip 132, and the steel strip 132 is welded to the connecting portion 142, that is, the welding block at the end of the steel strip 132 has the same shape as the head of the tie rod 131.

[0054] The present invention does not specifically limit the connection scheme and structure between the connecting portion 142 and the mounting portion 141 of the fastening joint 140, as long as stable fastening on the end plate is ensured. To ensure the stability of the fastening connection, in this embodiment, the connecting portion 142 is vertically provided in the middle of the mounting portion 141, and the connecting portion 142 is parallel to the stacking direction, that is, the fastening joint 140 is integrally in a T shape.

[0055] Both ends of the tie rod 131 are of a T-shaped structure. The "—" of the T shape is fixed at the boss positions of the intake end plate and the disc spring support plate 121, and the "|" passes through the avoidance areas of the intake end plate and the disc spring support plate 121. The tie rod 131 is designed with a threaded through hole for bolt fixation. After the tie rod 131 and the insulating support 170 are assembled together, they are assembled with the stack body of the fuel cell stack. The insulating rod is completely fitted with the stack core to prevent the stack core from collapsing.

[0056] The fastening joint 140 is of a T-shaped structure. Two fastening joints 140 are arranged for one steel strip 132, and the steel strip 132 is welded to the "—" of the T shape; if the structural strength is sufficient, it can also be welded to the "|". The schematic diagram takes the welding on the "—" as an example. The fastening joint 140 is designed with a threaded through hole for bolt fixation. After the steel strip 132 and the steel strip 132 insulating block are assembled together, they are welded to the fastening joint 140. In this embodiment, preferably, an insulating layer is provided on the outer surface of the steel strip 132, and the insulating layer can be completely fitted with the stack core to prevent the stack core from collapsing. If the distance between the steel strip 132 and the stack core is sufficient, the insulating support 170 may not be designed, and a design for preventing the stack core from collapsing can be made around the housing.

[0057] The following illustrates the assembly method and the principle of achieving generality of the fuel cell stack 100 provided in this embodiment in two cases where the fastening scheme is all tie rods 131 and all steel strips 132:

[0058] Assembly of the all-tie-rod 131 fuel cell stack: The tie rod 131 and the fastening joint 140 are of an integral structure. After the stack core is stacked and the disc spring support plate 121 is placed, the press is started. After the press runs to the set position, the tie rod 131 is installed so that the fastening joint 140 is assembled with the intake end plate and the disc spring support plate 121 and fixedly connected through the connecting member 160.

[0059] Assembly of the all-steel belt 132 welded fuel cell stack: First, assemble the fastening joint 140 with the air intake end plate and the disc spring support plate 121, assemble the steel belt 132 and the insulation layer or insulation support 170 to form a steel belt 132 assembly, then stack the core and place the disc spring support plate 121, start the press, and after the press runs to the set position, install the steel belt 132 assembly so that the two ends of the steel belt 132 are respectively fitted with the fastening joint 140 and welded.

[0060] Example 2

[0061] Based on the same inventive concept, this embodiment provides a fuel cell system, including the fuel cell stack provided in Example 1. The fuel cell stack, high-voltage components, low-voltage components, and housing together constitute a fuel cell module. This fuel cell system naturally has all the beneficial effects of the above-mentioned fuel cell stack, which will not be repeated here.

[0062] In order to cooperate with the fuel cell module, the fuel cell system also includes a fuel cell auxiliary system. The fuel cell system can operate normally under the condition of an external fuel supply source.

[0063] The fuel cell auxiliary system includes an air supply subsystem, a fuel supply subsystem, a thermal management subsystem, and an automatic control system. The air supply subsystem is used to supply air to each fuel cell module stack and can optionally filter, humidify, and pressure-regulate the air. The air supply subsystem is connected to the air inlet and air outlet of each fuel cell module stack. The fuel supply subsystem is used to supply fuel to each fuel cell module stack and can optionally humidify and pressure-regulate the fuel to convert it into fuel gas suitable for operation within the fuel cell stack. Taking hydrogen as the fuel, for example, the fuel supply subsystem is connected to the hydrogen inlet and hydrogen outlet of each fuel cell module stack. The thermal management subsystem is connected to each fuel cell module stack to provide coolant to cool and / or heat the stack and to recycle water generated by the stack. The automatic control system is electrically connected to the fuel cell module, air supply subsystem, fuel supply subsystem, and thermal management subsystem. The automatic control system is an assembly of sensors, actuators, valves, switches, and control logic components that ensure the normal operation of the fuel cell system without human intervention. In other embodiments, the fuel cell auxiliary system may further include a ventilation system for mechanically discharging gas from the fuel cell system housing to the exterior. The fuel cell auxiliary system in this embodiment has not been modified, so further details are provided in the relevant prior art disclosures and are not further described here.

[0064] Other structures of the fuel cell system not mentioned in this embodiment can be referred to in the prior art and will not be described in detail in this embodiment. For example, the fuel cell system also includes a housing having a mounting cavity, and the fuel cell stack is encapsulated in the mounting cavity of the housing. For example, in some embodiments, it also includes a high-voltage component, a gas distribution component, and a voltage inspection device to output current.

[0065] Example 3

[0066] Based on the same inventive concept, this embodiment provides a vehicle including the fuel cell system of Example 2. This vehicle naturally possesses all the beneficial effects of the fuel cell stack described above, which will not be described in detail here. The present invention does not specifically limit the type or type of vehicle; it can be any vehicle known in the art, such as a family car, a passenger car, a truck, etc. Other undescribed structures of the vehicle can be referred to the relevant disclosures in the prior art and will not be described in detail here.

[0067] The vehicle also includes a DC / DC converter, a drive motor and its motor controller, and an onboard energy storage device, which together with the fuel cell system form a fuel cell power system. The DC / DC converter is electrically connected to each fuel cell stack in the fuel cell system to achieve voltage conversion, regulating the voltage generated by each stack and outputting it to high-voltage components such as the drive motor and the vehicle air conditioning compressor, as well as energy storage devices such as batteries. The drive motor is electrically connected to the DC / DC converter to provide the torque required for vehicle operation. The motor controller is electrically connected to the drive motor to control its start, stop, and torque output. The motor controller is connected to the vehicle control system to receive driving signals from the vehicle control system and can optionally be electrically connected to the fuel cell system's automatic control system. The onboard energy storage device, for example, a battery, is used to store electrical energy to power other electronic devices within the vehicle and is electrically connected to the DC / DC converter.

[0068] In this embodiment, the DC / DC converter, the drive motor and its motor controller, and the on-board energy storage device in the fuel cell power system have not been improved. Therefore, for more detailed information, please refer to the relevant disclosures of the prior art and will not be described in detail here.

[0069] In addition, the vehicle also needs to include a transmission system and a fuel storage device for storing fuel. The transmission system transmits the torque of the drive motor to drive the wheels to rotate. The fuel storage device acts like a fuel tank in a fuel vehicle. The fuel storage device is connected to the fuel supply subsystem of the fuel cell system through a pipeline.

[0070] Thus, the vehicle can be a hydrogen-powered vehicle or a hydrogen-powered + rechargeable hybrid electric vehicle. Since this embodiment does not improve the specific structure of the vehicle, the unchanged structural features of the vehicle in this embodiment can refer to the existing technology and the details are not described in detail here. Therefore, the vehicle has all the features and advantages described above for the fuel cell module, and no further details are given here.

[0071] In summary, the fuel cell stack, fuel cell system and vehicle provided by the present invention realize a universal fastening connection design of two fasteners, namely, tie rods and steel belts, so that the tie rod fastening scheme that is easy to assemble and has stable stack can be universally switched with the lightweight steel belt fastening scheme, which is beneficial to the improvement of the scheme when the stack research and development stage turns to engineering development. Through the universal fastening joint structure, the operation of redesigning and verifying some parts is eliminated, which is beneficial to reducing development costs and solving the technical problem of increased costs caused by changing the fastening scheme.

[0072] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0073] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A fuel cell stack, comprising an intake end plate and a blind end plate assembly distributed at both ends of the fuel cell stack along the stacking direction of the fuel cell stack; characterized in that: Also includes: n fasteners, n ≥ 2, the n fasteners being distributed on at least two opposite sides of the fuel cell stack; The fastener is a pull rod and / or a steel belt; 2n fastening joints, respectively connected to both ends of the n fasteners; the fastening joints include a connected mounting portion and a connecting portion, the connecting portion being connected to the fasteners; the fastening joints are T-shaped as a whole, the connecting portion being perpendicular to the middle of the mounting portion and parallel to the stacking direction; when the fasteners are steel strips, the steel strips are welded and fixed to the fastening joints; In which, the sides of the air intake end plate and the blind end plate assembly are both provided with mounting positions, the mounting portion is arranged in the mounting position, and is connected to the air intake end plate or the blind end plate assembly through a connecting piece parallel to the stacking direction; the connecting piece is a bolt; the fastening joint is provided with a threaded through hole for the bolt to fix; the mounting position is a recessed groove matching the shape of the fastening joint; and / or, the end face of the air intake end plate / blind end plate assembly is a stepped surface, the step surface of the stepped surface constitutes the mounting position, and the side of the air intake end plate / blind end plate assembly is provided with a through hole for the connecting portion to pass through.

2. The fuel cell stack according to claim 1, wherein: The fastener is a pull rod, and the pull rod and the fastening joint are an integrated structure; and / or the fastener is a steel strip, and the steel strip is welded to the connecting portion.

3. The fuel cell stack according to any one of claims 1 to 2, characterized in that: The outer side surfaces of the mounting portion and the connecting portion are coplanar.

4. The fuel cell stack according to claim 3, wherein: The head of the bolt abuts against the surface of the inlet end plate / blind end plate assembly close to the core.

5. The fuel cell stack according to any one of claims 1 to 2, characterized in that: The fuel cell stack further includes an insulating support member disposed between the core of the fuel cell stack and the fastener.

6. The fuel cell stack according to claim 5, wherein: A limiting structure is provided on the fastener and / or the insulating support; and / or the insulating support has a recessed groove, and the fastener is interference-fitted with the recessed groove.

7. A fuel cell system, characterized in that: A fuel cell stack comprising the fuel cell stack according to any one of claims 1 to 6.

8. A vehicle, characterized in that: A fuel cell system comprising the fuel cell system according to claim 7.

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