Fuel cell stack and fuel cell

Abstract

The application provides a fuel cell stack and a fuel cell, the fuel cell stack comprises a stack core and a binding piece, the stack core comprises a plurality of cell structures arranged in a tangential direction, the binding piece is bound to the stack core, and the fuel cell stack further comprises a support assembly, the support assembly is arranged between the stack core and the binding piece in a normal direction, and the support assembly comprises a support piece, the support piece supports the stack core, and the support piece is movably arranged in the tangential direction to move along with the stack core when the stack core moves in the tangential direction, and the fuel cell stack of the application solves the problem that the fuel cell stack in the prior art is prone to failure.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and more specifically, to a fuel cell stack and a fuel cell. Background Technology

[0002] To meet the commercial application requirements of fuel cells, the power demand of fuel cell stacks is increasing. Fuel cell stacks typically consist of dozens to hundreds of individual cells. The simplest and most effective way to increase the power of a fuel cell stack is to increase the number of individual cells. However, as the number of individual cells increases, the height of the stack also increases, and the stack as a whole becomes "long and thin," which poses a stability problem. It is prone to buckling instability, resulting in a significant increase in the overall deformation of the stack. The largest deformation displacement is located in the middle of the stack. If the middle of the stack bulges to one side, it will reduce the insulation gap between that side and the encapsulation components such as steel strips or screws, or even cause contact or compression, resulting in a short circuit fault. The deformation of the stack can also cause the individual cells that make up the stack core to become misaligned, providing lateral forces to the sealing components that seal between the individual cells, causing them to deviate from their original vertically aligned sealing positions, resulting in gas leakage faults. Hydrogen leakage poses serious safety hazards such as combustion or even explosion. Summary of the Invention

[0003] The main objective of this invention is to provide a fuel cell stack and a fuel cell to solve the problem of easy failure in fuel cell stacks in the prior art.

[0004] To achieve the above objectives, according to one aspect of the present invention, a fuel cell stack is provided, including a stack core and a binding member. The stack core includes a plurality of battery structures arranged sequentially along a tangential direction. The binding member is bound to the stack core. The fuel cell stack also includes a support assembly disposed in the normal direction between the stack core and the binding member. The support assembly includes a support member that supports the stack core. The support member is movably disposed along the tangential direction to follow the movement of the stack core when the stack core moves along the tangential direction.

[0005] Furthermore, the support assembly also includes a telescopic member connected to the support member, at least a portion of which is telescopically oriented in the tangential direction so that when the fuel cell stack core moves in the tangential direction, the support member moves in the tangential direction along with the fuel cell stack core due to the telescopic movement of the telescopic member.

[0006] Furthermore, the telescopic member includes a bending portion, which is formed by bending at least a portion of the first plate structure into a plurality of folds, so as to cause the telescopic member to extend or retract in the tangential direction by deforming the folds.

[0007] Furthermore, the bend is wavy; and / or, the thickness of the first plate structure is greater than or equal to 0.2 mm and less than or equal to 1 mm; and / or, the minimum distance between the bend and the fuel cell core is greater than or equal to 0.5 mm and less than or equal to 2 mm; and / or, the minimum distance between the bend and the binding member is greater than or equal to 0.5 mm and less than or equal to 2 mm; and / or, the support assembly includes at least one telescopic member, and the difference between the sum of the tangential elongations of the bends of the at least one telescopic member and the tangential elongation of the fuel cell core is greater than or equal to 1 mm and less than or equal to 3 mm.

[0008] Furthermore, the fuel cell stack also includes a first end plate and a second end plate spaced apart along the tangential direction, with the stack core disposed between the first end plate and the second end plate; the support assembly includes two telescopic members disposed on opposite sides of the support member, with the first ends of the two telescopic members respectively connected to the two ends of the support member, and the second ends of the two telescopic members respectively connected to the first end plate and the second end plate; wherein, the bending portion is located between the first end and the second end of the telescopic member.

[0009] Furthermore, the first plate structure includes a first plate segment, a second plate segment, and a third plate segment connected in sequence. The first end of the first plate segment is connected to a first end plate or a second end plate. The first end of the second plate segment is connected to the second end of the first plate segment, and the second end of the second plate segment is connected to the first end of the third plate segment. The bending portion is formed by bending the second plate segment into multiple pleats. The telescopic member also includes a transition connection portion. The first end of the transition connection portion is connected to the second end of the third plate segment, and the second end of the transition connection portion is connected to the first end or the second end of the support member. In the direction from the first end to the second end of the transition connection portion, the thickness of the transition connection portion gradually increases.

[0010] Furthermore, the support member includes a second plate structure and a third plate structure connected to the second plate structure. The second plate structure is disposed between the tie member and the third plate structure, and the third plate structure is disposed between the second plate structure and the fuel cell core. The second plate structure is a rigid member, the third plate structure is a flexible member, and the support member is clamped between the fuel cell core and the tie member so that at least a portion of the second plate structure is in contact with the tie member, and at least a portion of the third plate structure is in contact with the fuel cell core.

[0011] Furthermore, the fuel cell stack core has multiple gaps, and a portion of the third plate structure is extruded within these gaps.

[0012] Furthermore, the support member has a first end and a second end arranged sequentially along the tangential direction. From the middle of the support member to the first end of the support member, the thickness of the support member gradually decreases in the normal direction. From the middle of the support member to the second end of the support member, the thickness of the support member gradually decreases in the normal direction. The middle of the second plate structure is attached to the binding member, and the middle of the third plate structure is attached to the fuel cell stack core.

[0013] Furthermore, the bonding width between the third plate structure and the fuel cell core along the tangential direction is L2, and the length of the fuel cell core in the tangential direction is L; wherein, L2 is 5% to 30% of L.

[0014] Furthermore, the support members are made of insulating and flame-retardant materials; and / or, the telescopic members are made of insulating and flame-retardant materials.

[0015] According to another aspect of the present invention, a fuel cell is provided, comprising the above-described fuel cell stack.

[0016] According to the technical solution of this invention, a fuel cell stack includes a stack core, a support assembly, and a binding member. The stack core includes multiple battery structures arranged sequentially along the tangential direction. The support assembly includes a support member, and the binding member is bound to the stack core. The support assembly is disposed between the stack core and the binding member in the normal direction. The binding member applies normal pressure to the support assembly, which transmits the pressure to the stack core. This allows the support member to support and protect the stack core, preventing displacement and deformation of the stack core along the normal direction and improving the stability of the stack core. When the stack core moves tangentially, the support member can move with the stack core, effectively preventing relative movement between the support member and the stack core that could cause friction and wear, leading to conductive particles adhering to the support member and short-circuiting failure of the battery structures. The support assembly also prevents direct contact or compression between the stack core and the binding member, which could cause a short circuit in the stack. Therefore, this invention provides support and protection for the fuel cell stack by setting a support component between the stack core and the binding member, thereby preventing stack core deformation and avoiding short circuits and gas leaks, thus solving the problem of easy failure of fuel cell stacks in the prior art. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A top view of an embodiment of a fuel cell stack according to the present invention is shown;

[0019] Figure 2 An isometric view of an embodiment of a fuel cell stack according to the present invention is shown;

[0020] Figure 3 It shows Figure 1 Sectional view at point AA;

[0021] Figure 4 It shows Figure 3 A magnified view of a portion of point A in the middle.

[0022] The above figures include the following reference numerals:

[0023] 10. Battery stack core; 11. Battery structure; 14. Gap; 20. Bundling component; 30. Support assembly; 31. Support component; 311. Second plate structure; 312. Third plate structure; 32. Telescopic component; 321. Bending part; 322. Transition connection part; 40. First end plate; 50. Second end plate; 61. First plate segment; 62. Second plate segment; 63. Third plate segment. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] This invention provides a fuel cell stack, please refer to... Figures 1 to 4 The fuel cell stack includes a fuel cell core 10 and a binding member 20. The fuel cell core 10 includes a plurality of battery structures 11 arranged sequentially along the tangential direction. The binding member 20 is bound to the fuel cell core 10. The fuel cell stack also includes a support assembly 30, which is arranged in the normal direction between the fuel cell core 10 and the binding member 20. The support assembly 30 includes a support member 31, which supports the fuel cell core 10. The support member 31 is movably arranged along the tangential direction so as to follow the movement of the fuel cell core 10 when the fuel cell core 10 moves along the tangential direction.

[0028] The fuel cell stack of the present invention includes a stack core 10, a support assembly 30 and a binding member 20. The stack core 10 includes a plurality of battery structures 11 arranged sequentially along the tangential direction. The support assembly 30 includes a support member 31. The binding member 20 is bound to the stack core 10. The support assembly 30 is arranged between the stack core 10 and the binding member 20 in the normal direction. The binding member 20 applies normal pressure to the support assembly 30, which transmits the pressure to the fuel cell stack core 10. This allows the support member 31 to support and protect the fuel cell stack core 10, preventing displacement and deformation along the normal direction and improving its stability. When the fuel cell stack core 10 moves tangentially, the support member 31 moves with it, effectively preventing relative movement and frictional wear between the support member 31 and the fuel cell stack core 10, which could lead to conductive particles adhering to the support member 31 and causing short circuits in the battery structure 11. The support assembly 30 also prevents direct contact or compression between the fuel cell stack core 10 and the binding member 20, thus avoiding short circuits. Therefore, this invention solves the problem of easy failure in existing fuel cell stacks by providing a support assembly 30 between the fuel cell stack core 10 and the binding member 20, thus preventing deformation, short circuits, and gas leakage.

[0029] Specifically, the normal direction is as follows: Figure 3 The F direction shown is tangential as follows: Figure 3 The horizontal direction shown.

[0030] Optionally, the binding element 20 is a steel strap.

[0031] In this embodiment, the support assembly 30 further includes a telescopic member 32 connected to the support member 31. At least a portion of the telescopic member 32 is telescopically arranged in the tangential direction so that when the fuel cell core 10 moves in the tangential direction, the support member 31 moves along the tangential direction with the extension and retraction of the telescopic member 32.

[0032] Specifically, the support member 31 moves in the tangential direction, causing at least a portion of the telescopic member 32 to extend and retract in the tangential direction. The length of the telescopic member 32 in the tangential direction is variable, which compensates for the tangential movement of the support member 31, avoids the support assembly 30 from being repeatedly subjected to force and pulling on the first and second end plates of the fuel cell stack, and ensures that the support member 31 can move with the stack core 10.

[0033] In this embodiment, the telescopic member 32 includes a bending portion 321, which is formed by bending at least a portion of the first plate structure into a plurality of folds, so that the telescopic member 32 can be extended or retracted in the tangential direction by deforming the folds.

[0034] Specifically, the deformation of multiple folds allows at least a portion of the telescopic member 32 to extend and retract tangentially, thereby ensuring that the support member 31 can move tangentially along with the fuel cell stack core 10.

[0035] In this embodiment, the bend 321 is wavy; and / or, the thickness of the first plate structure is greater than or equal to 0.2 mm and less than or equal to 1 mm; and / or, the minimum distance between the bend 321 and the fuel cell stack core 10 is greater than or equal to 0.5 mm and less than or equal to 2 mm; and / or, the minimum distance between the bend 321 and the binding member 20 is greater than or equal to 0.5 mm and less than or equal to 2 mm; and / or, the support assembly 30 includes at least one telescopic member 32, and the difference between the sum of the elongations of the bends 321 of the at least one telescopic member 32 in the tangential direction and the elongation of the fuel cell stack core 10 in the tangential direction is greater than or equal to 1 mm and less than or equal to 3 mm.

[0036] Specifically, the thickness of the first plate structure is greater than or equal to 0.2 mm and less than or equal to 1 mm. This avoids the first plate structure being too thick, which would affect the flexibility of the telescopic member 32, and the first plate structure being too thin, which would cause breakage. The minimum distance ΔH between the bending part 321 and the fuel cell core 10 is greater than or equal to 0.5 mm and less than or equal to 2 mm. This avoids the distance between the bending part 321 and the fuel cell core 10 being too small, which would limit the elongation of the telescopic member 32 in the tangential direction, and the distance between the bending part 321 and the fuel cell core 10 being too large, which would affect the support effect of the support member 31 on the fuel cell core 10. The minimum distance ΔH between the bending part 321 and the fuel cell core 10 is greater than or equal to 0.5 mm and less than or equal to 2 mm. This can prevent the distance between the bending part 321 and the binding member 20 from being too small, which would limit the elongation of the telescopic member 32 in the tangential direction, and the distance between the bending part 321 and the binding member 20 from being too large, which would affect the squeezing effect of the binding member 20 on the support member 31. The difference between the sum of the elongation of the bending part 321 of at least one telescopic member 32 in the tangential direction and the elongation (ΔL) of the fuel cell core 10 in the tangential direction under the influence of the temperature, pressure and humidity of the reaction gas during operation is greater than or equal to 1 mm and less than or equal to 3 mm. This can prevent the displacement of the support member 31 in the tangential direction from being much greater than the displacement of the fuel cell core 10 in the tangential direction, which would prevent the support member 31 from accurately following the movement of the fuel cell core 10 in the tangential direction.

[0037] Specifically, the wavy shape of the bend 321 can enhance the deformation effect of the telescopic member 32, further ensuring that the support member 31 can follow the movement of the fuel cell stack core 10 in the tangential direction; the sum of the lengths of the two telescopic members 32 in the tangential direction when they are not extended is 2*L1, the sum of the elongation of the bend 321 of the two telescopic members 32 in the tangential direction is 2*ΔL1, and the length of the fuel cell stack core 10 in the tangential direction is L.

[0038] In this embodiment, the fuel cell stack also includes a first end plate 40 and a second end plate 50 spaced apart along the tangential direction, and the stack core 10 is disposed between the first end plate 40 and the second end plate 50; the support assembly 30 includes two telescopic members 32, which are disposed on opposite sides of the support member 31, with the first ends of the two telescopic members 32 respectively connected to the two ends of the support member 31, and the second ends of the two telescopic members 32 respectively connected to the first end plate 40 and the second end plate 50; wherein, the bending portion 321 is located between the first end and the second end of the telescopic member 32.

[0039] Specifically, the two telescopic members 32 are used to connect the two end plates and the support member 31 respectively. The telescopic deformation of the telescopic members 32 can ensure that the support member 31 can move tangentially with the fuel cell stack core 10. When the second end of the telescopic member 32 moves with the support member 31, there is no relative displacement between the first end of the telescopic member 32 and the two end plates, thereby avoiding repeated pulling of the telescopic member 32 by the two end plates, which would cause damage and failure of the support assembly 30. At the same time, the support assembly 30 can be fixed to the two end plates in an extended state by the bending part 321 before the fuel cell stack core 10 is compressed. Then the support assembly 30 is compressed and sealed together with the fuel cell stack core 10, thereby solving the problem of installation difficulty caused by sealing the fuel cell stack core 10 first and then installing the support assembly 30. This makes the fuel cell stack of the present invention have the advantages of good assembly processability and easy installation.

[0040] In this embodiment, the first plate structure includes a first plate segment 61, a second plate segment 62, and a third plate segment 63 connected in sequence. The first end of the first plate segment 61 is connected to the first end plate 40 or the second end plate 50. The first end of the second plate segment 62 is connected to the second end of the first plate segment 61, and the second end of the second plate segment 62 is connected to the first end of the third plate segment 63. The bending portion 321 is formed by bending the second plate segment 62 into multiple pleats. The telescopic member 32 also includes a transition connection portion 322. The first end of the transition connection portion 322 is connected to the second end of the third plate segment 63, and the second end of the transition connection portion 322 is connected to the first end or the second end of the support member 31. The thickness of the transition connection portion 322 gradually increases from the first end to the second end.

[0041] Specifically, the first plate segment 61 connects the first plate structure and the first end plate 40 or the second end plate 50. The second plate segment 62 forms multiple folds to allow the telescopic member 32 to expand and contract. The second plate segment 62 is connected to the transition connection portion 322 via the third plate segment 63. The transition connection portion 322 connects the support member 31 to the third plate segment 63, making the support member 31, the first plate structure, and the two end plates a unified whole, thus enhancing the overall efficiency of the fuel cell stack. From the first end to the second end of the transition connection portion 322, the thickness of the transition connection portion 322 gradually increases, allowing its thickness to be flexibly adjusted according to the thicknesses of the support member 31 and the third plate segment 63, thereby enhancing the reliability of the connection between the transition connection portion 322 and the support member 31 and the third plate segment 63.

[0042] Optionally, the support assembly 30 is fixed to the two end plates of the fuel cell stack core 10 by means of adhesive or screws before the core 10 is encapsulated. The support assembly 30 is connected to the two end plates through the first plate segment 61.

[0043] In this embodiment, the support member 31 includes a second plate structure 311 and a third plate structure 312 connected to the second plate structure 311. The second plate structure 311 is disposed between the binding member 20 and the third plate structure 312, and the third plate structure 312 is disposed between the second plate structure 311 and the fuel cell stack core 10. The second plate structure 311 is a rigid member, and the third plate structure 312 is a flexible member. The support member 31 is clamped between the fuel cell stack core 10 and the binding member 20 so that at least a portion of the second plate structure 311 is in contact with the binding member 20, and at least a portion of the third plate structure 312 is in contact with the fuel cell stack core 10.

[0044] Specifically, at least a portion of the second plate structure 311 is in contact with the binding member 20, and at least a portion of the third plate structure 312 is in contact with the fuel cell stack core 10. This allows the binding member 20 to apply normal pressure to the second plate structure 311, which then transfers the pressure to the third plate structure 312, which in turn transfers the pressure to the fuel cell stack core 10. This allows the support member 31 to support the fuel cell stack core 10, preventing displacement and deformation of the fuel cell stack core 10 along the normal direction and improving the stability of the fuel cell stack core 10.

[0045] It should be noted that the flexible component is a structure that deforms when subjected to force and can recover its deformation after the force is removed, so that the third plate structure 312 can play a buffering and protective role for the fuel cell core 10; the rigid component can effectively transfer the normal pressure of the binding component 20 to the fuel cell core 10, providing strong support and protection for the fuel cell core 10.

[0046] Optionally, the flexible component is made of rubber material with a Shore hardness of 30 to 60 HA; any two of the transition connection 322, the second plate structure 311, and the third plate structure 312 are bonded and connected by means of bonding or hot pressing.

[0047] Specifically, the thickness H of the middle part of the support component 30 is 0.5 to 2 mm larger than the theoretical gap between the tie member 20 and the fuel cell core 10. After the tie member 20 is installed, the tie member 20 will provide normal pressure to the support component 30. This force can effectively support the fuel cell core 10 and improve the stability of the fuel cell core 10.

[0048] In this embodiment, the fuel cell stack core 10 has multiple gaps 14, and a portion of the third plate structure 312 is squeezed into the multiple gaps 14. This arrangement allows the third plate structure 312 to move when the fuel cell stack core 10 moves in the tangential direction, thereby causing the support member 31 to follow the fuel cell stack core 10 in the tangential direction.

[0049] Specifically, gap 14 is formed due to reasons such as the protrusion of the membrane electrode from the bipolar plate, the bipolar plate removal process, and single cell assembly deviation.

[0050] In this embodiment, the support member 31 has a first end and a second end arranged sequentially along the tangential direction. From the middle of the support member 31 to the first end of the support member 31, the thickness of the support member 31 gradually decreases in the normal direction. From the middle of the support member 31 to the second end of the support member 31, the thickness of the support member 31 gradually decreases in the normal direction. The middle of the second plate structure 311 is attached to the binding member 20, and the middle of the third plate structure 312 is attached to the fuel cell stack core 10.

[0051] Specifically, the location with the largest deformation displacement of the fuel cell stack core 10 is located in the middle of the fuel cell stack. From the middle of the support member 31 to the first end of the support member 31, the thickness of the support member 31 gradually decreases in the normal direction. From the middle of the support member 31 to the second end of the support member 31, the thickness of the support member 31 gradually decreases in the normal direction. The thickness change of the support member 31 is very consistent with the deformation tendency of the fuel cell stack core 10, so that the second plate structure 311 can better transfer the pressure to the third plate structure 312, and the third plate structure 312 can better transfer the pressure to the fuel cell stack core 10. This allows the support member 31 to provide strong support for the main deformation area of ​​the fuel cell stack core 10, thereby improving the stability of the fuel cell stack core 10.

[0052] In this embodiment, the tangential bonding width between the third plate structure 312 and the fuel cell core 10 is L2, and the tangential length of the fuel cell core 10 is L; wherein, L2 is 5% to 30% of L. This arrangement can prevent the fuel cell core 10 from being unable to move the support member 31 due to an excessively small bonding width between the third plate structure 312 and the fuel cell core 10.

[0053] In this embodiment, the support member 31 is made of an insulating and flame-retardant material; and / or, the telescopic member 32 is made of an insulating and flame-retardant material. This arrangement enables the support assembly 30 to isolate the fuel cell stack core 10 and the tie-down member 20, thereby providing insulation and further preventing short-circuit faults in the fuel cell stack core 10.

[0054] Optionally, the first plate structure is made of insulating and flame-retardant plastic materials such as polycarbonate resin, so that the support component 30 can isolate the fuel cell core 10 and the binding member 20 to play an insulating role, further avoiding short circuit faults in the fuel cell core 10; the third plate structure 312 is made of insulating and flame-retardant rubber material.

[0055] The present invention also provides a fuel cell comprising the fuel cell stack of the above embodiments.

[0056] The fuel cell of the present invention includes the fuel cell stack in the above embodiments. The fuel cell stack includes a stack core 10, a support assembly 30, and a binding member 20. The stack core 10 includes a plurality of battery structures 11 arranged sequentially along the tangential direction. The support assembly 30 includes a support member 31. The binding member 20 is bound to the stack core 10. The support assembly 30 is arranged between the stack core 10 and the binding member 20 in the normal direction. The binding member 20 applies normal pressure to the support assembly 30, which transmits the pressure to the fuel cell stack core 10. This allows the support member 31 to support and protect the fuel cell stack core 10, preventing displacement and deformation along the normal direction and improving its stability. When the fuel cell stack core 10 moves tangentially, the support member 31 moves with it, effectively preventing relative movement and frictional wear between the support member 31 and the fuel cell stack core 10, which could lead to conductive particles adhering to the support member 31 and causing short circuits in the battery structure 11. The support assembly 30 also prevents direct contact or compression between the fuel cell stack core 10 and the binding member 20, thus avoiding short circuits. Therefore, this invention solves the problem of easy failure in existing fuel cell stacks by providing a support assembly 30 between the fuel cell stack core 10 and the binding member 20, thus preventing deformation, short circuits, and gas leakage.

[0057] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0058] The fuel cell stack of the present invention includes a support assembly 30 disposed between the stack core 10 and the binding member 20. The support assembly 30 includes a first plate structure, a second plate structure 311, and a third plate structure 312. The second plate structure 311 is attached to the binding member 20 to transmit the normal pressure of the binding member 20. The third plate structure 312 is attached to the stack core 10 and can not only transmit the normal pressure of the binding member 20 to the stack core 10, but also move with the stack core 10 in the tangential direction. The support assembly 30 has a telescopic member 32 to compensate for the tangential movement of the stack core 10. Before the stack core 10 is encapsulated, the support assembly 30 is fixed on the two end plates of the stack core 10. After encapsulation, the support assembly 30 covers the area between the stack core 10 and the binding member 20, which not only isolates the stack core 10 and the binding member 20 to provide insulation, but also effectively supports the stack core 10 and improves the stability of the stack core 10.

[0059] The fuel cell stack of the present invention includes a stack core 10, a support assembly 30 and a binding member 20. The stack core 10 includes a plurality of battery structures 11 arranged sequentially along the tangential direction. The support assembly 30 includes a support member 31. The binding member 20 is bound to the stack core 10. The support assembly 30 is arranged between the stack core 10 and the binding member 20 in the normal direction. The binding member 20 applies normal pressure to the support assembly 30, which transmits the pressure to the fuel cell stack core 10. This allows the support member 31 to support and protect the fuel cell stack core 10, preventing displacement and deformation along the normal direction and improving its stability. When the fuel cell stack core 10 moves tangentially, the support member 31 moves with it, effectively preventing relative movement and frictional wear between the support member 31 and the fuel cell stack core 10, which could lead to conductive particles adhering to the support member 31 and causing short circuits in the battery structure 11. The support assembly 30 also prevents direct contact or compression between the fuel cell stack core 10 and the binding member 20, thus avoiding short circuits. Therefore, this invention solves the problem of easy failure in existing fuel cell stacks by providing a support assembly 30 between the fuel cell stack core 10 and the binding member 20, thus preventing deformation, short circuits, and gas leakage.

[0060] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0061] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fuel cell stack, comprising a stack core (10) and a binding member (20), wherein the stack core (10) comprises a plurality of battery structures (11) arranged sequentially along a tangential direction, and the binding member (20) is bound to the stack core (10), characterized in that, The fuel cell stack also includes a support assembly (30), which is disposed in the normal direction between the stack core (10) and the tie-down member (20). The support assembly (30) includes a support member (31) that supports the stack core (10). The support member (31) is movably disposed in the tangential direction to follow the movement of the stack core (10) when the stack core (10) moves in the tangential direction. The support assembly (30) further includes a telescopic member (32) connected to the support member (31), at least a portion of which is telescopically arranged along the tangential direction so that when the fuel cell core (10) moves along the tangential direction, the support member (31) moves along the tangential direction with the extension and retraction of the telescopic member (32); The telescopic member (32) includes a bending portion (321) which is formed by bending at least a portion of the first plate structure into a plurality of folds, so as to cause the telescopic member (32) to extend or retract in the tangential direction by deforming the folds.

2. The fuel cell stack according to claim 1, characterized in that, The bent portion (321) is wavy; and / or, The thickness of the first plate structure is greater than or equal to 0.2 mm and less than or equal to 1 mm; and / or, The minimum distance between the bent portion (321) and the fuel cell stack core (10) is greater than or equal to 0.5 mm and less than or equal to 2 mm; and / or, The minimum distance between the bent portion (321) and the binding member (20) is greater than or equal to 0.5 mm and less than or equal to 2 mm; and / or, The support assembly (30) includes at least one of the telescopic members (32), and the difference between the sum of the elongations of the bent portions (321) of at least one of the telescopic members (32) in the tangential direction and the elongation of the fuel cell core (10) in the tangential direction is greater than or equal to 1 mm and less than or equal to 3 mm.

3. The fuel cell stack according to claim 1, characterized in that, The fuel cell stack also includes a first end plate (40) and a second end plate (50) spaced apart along the tangential direction, and the stack core (10) is disposed between the first end plate (40) and the second end plate (50); The support assembly (30) includes two telescopic members (32), which are disposed on opposite sides of the support member (31). The first ends of the two telescopic members (32) are respectively connected to the two ends of the support member (31), and the second ends of the two telescopic members (32) are respectively connected to the first end plate (40) and the second end plate (50). The bent portion (321) is located between the first end and the second end of the telescopic member (32).

4. The fuel cell stack according to claim 3, characterized in that, The first plate structure includes a first plate segment (61), a second plate segment (62), and a third plate segment (63) connected in sequence. The first end of the first plate segment (61) is connected to the first end plate (40) or the second end plate (50); the first end of the second plate segment (62) is connected to the second end of the first plate segment (61), and the second end of the second plate segment (62) is connected to the first end of the third plate segment (63). The bending part (321) is formed by bending the second plate segment (62) into multiple pleats. The telescopic member (32) further includes a transition connection (322), the first end of which is connected to the second end of the third plate segment (63), and the second end of which is connected to the first or second end of the support member (31); wherein, the thickness of the transition connection (322) gradually increases from the first end to the second end of the transition connection (322).

5. The fuel cell stack according to any one of claims 1 to 4, characterized in that, The support member (31) includes a second plate structure (311) and a third plate structure (312) connected to the second plate structure (311). The second plate structure (311) is disposed between the binding member (20) and the third plate structure (312). The third plate structure (312) is disposed between the second plate structure (311) and the fuel cell stack core (10). The second plate structure (311) is a rigid member, the third plate structure (312) is a flexible member, and the support member (31) is clamped between the fuel cell stack core (10) and the binding member (20) so that at least a portion of the second plate structure (311) is in contact with the binding member (20) and at least a portion of the third plate structure (312) is in contact with the fuel cell stack core (10).

6. The fuel cell stack according to claim 5, characterized in that, The fuel cell stack core (10) has multiple gaps (14), and a portion of the third plate structure (312) is squeezed into the multiple gaps (14).

7. The fuel cell stack according to claim 5, characterized in that, The support member (31) has a first end and a second end arranged sequentially along the tangential direction. From the middle of the support member (31) to the first end of the support member (31), the thickness of the support member (31) gradually decreases in the normal direction. From the middle of the support member (31) to the second end of the support member (31), the thickness of the support member (31) gradually decreases in the normal direction. The middle of the second plate structure (311) is attached to the binding member (20), and the middle of the third plate structure (312) is attached to the fuel cell stack core (10).

8. The fuel cell stack according to claim 5, characterized in that, The bonding width between the third plate structure (312) and the fuel cell stack core (10) along the tangential direction is L2, and the length of the fuel cell stack core (10) in the tangential direction is L; wherein, L2 is 5% to 30% of L.

9. The fuel cell stack according to any one of claims 2 to 4, characterized in that, The support member (31) is made of insulating and flame-retardant material; and / or, The telescopic component (32) is made of insulating and flame-retardant material.

10. A fuel cell, characterized in that, The fuel cell stack includes any one of claims 1 to 9.

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