Pull rod and fuel cell stack

Abstract

The utility model relates to the technical field of fuel cell stacks, and discloses a pull rod and a fuel cell stack, the pull rod comprises a rod main body and an insulator, the rod main body comprises a first connecting part, a main body part and a second connecting part which are sequentially connected along a first direction, and the first connecting part is used for being connected with a front end plate of the fuel cell stack; the second connecting part is used for being connected with a rear end plate of the fuel cell stack, the insulator is provided with a connecting hole penetrating in the first direction, the peripheral wall of the insulator is provided with a contact plane, the contact plane is used for being in contact with a stack main body of the fuel cell stack, the main body part penetrates through the connecting hole, and the outer wall of the main body part is in contact with the hole wall of the connecting hole. As the insulator is connected to the rod main body, the pull rod has an insulating property, and on the basis, when the pull rod is applied to the fuel cell stack, only the pull rod needs to be assembled and the insulating rod does not need to be assembled when the fuel cell stack is assembled, so that the assembling process is simplified, and the assembling efficiency of the fuel cell stack can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cell stacks, in particular to a pull rod and a fuel cell stack. Background Art

[0002] A fuel cell stack is a device that directly converts the chemical energy of a fuel into electrical energy. In the related art, as shown in the fuel cell stack disclosed in the invention patent publication number CN113745623A, a fuel cell stack uses a tie rod in conjunction with a front end plate and a rear end plate to fix multiple fuel cell monomers, and an insulating rod is provided between the tie rod and the fuel cell monomer to achieve insulation. In a fuel cell stack of this structure, since an insulating rod needs to be provided between the tie rod and the fuel cell monomer to achieve insulation, the insulating rod and the tie rod need to be installed in sequence during assembly, and the insulating rod and the tie rod need to be aligned during the assembly process, resulting in a cumbersome assembly process and low assembly efficiency. Utility Model Content

[0003] The primary purpose of the utility model is to provide a pull rod, which is applied to a fuel cell stack to improve the assembly efficiency of the fuel cell stack.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a pull rod, which is suitable for a fuel cell stack, including a rod body and an insulator, wherein the rod body includes a first connecting part, a main body and a second connecting part connected in sequence along a first direction, one of the first connecting part and the second connecting part is used to connect to the front end plate of the fuel cell stack, and the other is used to connect to the rear end plate of the fuel cell stack, the insulator is provided with a connecting hole passing through along the first direction, the outer peripheral wall of the insulator has a contact plane, and the contact plane is used to contact with the stack body of the fuel cell stack, wherein the main body is penetrated by the connecting hole, and the outer wall of the main body is in contact with the hole wall of the connecting hole.

[0005] In a specific embodiment of the utility model, the rod body has a first positioning structure, and the first positioning structure is provided on the outer wall of the main body;

[0006] The insulator has a second positioning structure, and the second positioning structure is arranged on the hole wall of the connecting hole;

[0007] The first positioning structure and the second positioning structure cooperate with each other to position and connect the rod body and the insulator.

[0008] In a specific embodiment of the present invention, one of the first positioning structure and the second positioning structure is a positioning groove, and the other is a positioning protrusion.

[0009] In a specific embodiment of the utility model, the insulator is a trapezoidal body, the cross section of the insulator perpendicular to the first direction is a trapezoidal surface, and the plane where the bottom of the trapezoidal surface is located is the contact plane.

[0010] In a specific embodiment of the present invention, a weight-reducing groove is provided on a side of the insulator adjacent to the contact plane.

[0011] In a specific embodiment of the utility model, the first connecting portion includes a connecting plate and a clamping protrusion, the connecting plate is connected to the main body, the connecting plate is provided with a mounting through hole penetrating along the second direction, and the connecting plate is provided with the clamping protrusion on both sides along the first direction, wherein the second direction is perpendicular to the first direction.

[0012] In a specific embodiment of the present invention, the second connecting portion includes a connecting screw and a nut, the connecting screw is connected to the main body, and the nut is connected to the connecting screw.

[0013] In a specific embodiment of the present invention, the rod body is made of aluminum alloy.

[0014] In a specific embodiment of the present invention, the insulator is made of plastic.

[0015] The utility model also proposes a fuel cell stack, comprising a front end plate, a rear end plate, a stack body and the pull rod as described above, wherein the front end plate and the rear end plate are respectively in contact with the two ends of the stack body along the first direction, and a plurality of pull rods are provided, one of the first connecting portion and the second connecting portion of each of the pull rods is connected to the front end plate, and the other is connected to the rear end plate, the contact plane of the insulator is in contact with the stack body, and a plurality of the pull rods are arranged around the stack body.

[0016] The utility model provides a pull rod and a fuel cell stack, which has the following beneficial effects compared with the prior art:

[0017] The pull rod of the utility model includes a rod body and an insulator. The insulator is provided with a connection hole. The main body of the rod body passes through the connection hole, and the outer wall of the main body is connected to the hole wall of the connection hole, that is, the insulator is connected to the rod body, and the pull rod has an insulating property. Based on this, the pull rod is applied to a fuel cell stack. When assembling the fuel cell stack, only the pull rod needs to be assembled, and no insulating rod needs to be assembled, which simplifies the assembly process and improves the assembly efficiency of the fuel cell stack. In addition, the outer wall of the pull rod insulator has a contact plane. When the pull rod is applied to the fuel cell stack, the contact plane contacts the stack body of the fuel cell stack, that is, the pull rod has a certain contact area with the stack body. Based on this, the support performance of the pull rod on the stack body can be improved, and the stability of the fuel cell stack structure can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a pull rod according to an embodiment of the utility model;

[0019] Figure 2 It is an exploded schematic diagram of the pull rod of the embodiment of the utility model;

[0020] Figure 3 It is a structural diagram of a fuel cell stack according to an embodiment of the utility model.

[0021] In the figure, 1, rod body; 11, first connecting part; 111, connecting plate; 1110, mounting through hole; 112, clamping protrusion; 12, main body; 121, first positioning structure; 13, second connecting part; 131, connecting screw; 132, nut; 2, insulator; 21, connecting hole; 22, contact plane; 23, second positioning structure; 24, weight reduction groove; X, first direction; Y, second direction; 10, front end plate; 20, rear end plate; 30, battery stack body; 40, pull rod. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] like Figure 3 As shown, the utility model proposes a fuel cell stack, which can supply power to electrical equipment, and includes a front end plate 10, a rear end plate 20, a stack body 30 and a tie rod 40 as described below. The front end plate 10 and the rear end plate 20 are respectively in contact with both ends of the stack body 30 along the first direction X. A plurality of tie rods 40 are provided, one of the first connection part 11 and the second connection part 13 of each tie rod 40 is connected to the front end plate 10, and the other is connected to the rear end plate 20. The contact plane 22 of the insulator 2 is in contact with the stack body 30, and a plurality of tie rods 40 are arranged around the stack body 30. In this embodiment, the stack body 30 is composed of a plurality of fuel cell monomers stacked along the first direction X.

[0027] like Figure 1-2 As shown, a pull rod 40 of a preferred embodiment of the utility model is suitable for a fuel cell stack, comprising a rod body 1 and an insulator 2, the rod body 1 comprising a first connecting portion 11, a main body 12 and a second connecting portion 13 connected in sequence along a first direction X, the first connecting portion 11 is used to connect to a front end plate 10 of the fuel cell stack, the second connecting portion 13 is used to connect to a rear end plate 20 of the fuel cell stack, the insulator 2 is provided with a connecting hole 21 passing through along the first direction X, the outer peripheral wall of the insulator 2 has a contact plane 22, the contact plane 22 is used to contact with the stack body 30 of the fuel cell stack, wherein the main body 12 is provided with a connecting hole 21, and the outer wall of the main body 12 is in contact with the hole wall of the connecting hole 21.

[0028] Specifically, the insulator 2 is connected to the rod body 1, and the pull rod 40 has insulating properties. Based on this, the pull rod 40 is applied to the fuel cell stack. When assembling the fuel cell stack, only the pull rod 40 needs to be assembled, and no insulating rod needs to be assembled, which simplifies the assembly process and improves the assembly efficiency of the fuel cell stack. In addition, the outer wall of the insulator 2 of the pull rod 40 has a contact plane 22. When the pull rod 40 is applied to the fuel cell stack, the contact plane 22 contacts the stack body 30 of the fuel cell stack, that is, the pull rod 40 and the stack body 30 have a certain contact area. Based on this, the support performance of the pull rod 40 on the stack body 30 can be improved, and the stability of the fuel cell stack structure can be improved.

[0029] By tightening the front plate 10 and the rear plate 20 with the tie rod 40, squeezing of the bipolar plates on the fuel cell stack can be effectively avoided. Moreover, compared with the existing fuel cell stack that uses a steel belt to tighten the front plate 10 and the rear plate 20, the tie rod 40 has high rigidity, which can increase the first-order modal frequency of the fuel cell stack and effectively solve the problem of slippage of the stack body 30 caused by vibration.

[0030] Furthermore, if Figure 2 As shown, the rod body 1 has a first positioning structure 121, which is arranged on the outer wall of the main body 12; the insulator 2 has a second positioning structure 23, which is arranged on the hole wall of the connecting hole 21; wherein the first positioning structure 121 and the second positioning structure 23 cooperate with each other to position and connect the rod body 1 and the insulator 2, based on which, the connection between the rod body 1 and the insulator 2 can be made more stable.

[0031] In this embodiment, for example, Figure 2 As shown, the first positioning structure 121 is a positioning groove, and the second positioning structure 23 is a positioning protrusion, the structure is simple, and the connection stability between the two is high.

[0032] In other embodiments, the first positioning structure 121 may be a positioning protrusion, and the second positioning structure 23 may be a positioning groove, which may also realize the positioning connection between the rod body 1 and the insulator 2 .

[0033] In this embodiment, if Figure 2 As shown, the insulator 2 is a trapezoidal body, and the cross-section of the insulator 2 perpendicular to the first direction X is a trapezoidal surface, and the plane where the bottom of the trapezoidal surface is located is the contact plane 22. The insulator 2 with this structure ensures that it has a certain contact area with the battery stack body 30, and at the same time, it can reduce the volume of the insulator 2 as much as possible, so that the pull rod 40 has the characteristic of being lightweight.

[0034] Furthermore, if Figure 2 As shown, a weight-reducing groove 24 is provided on the side of the insulator 2 adjacent to the contact plane 22 , thereby making the pull rod 40 more lightweight.

[0035] like Figure 2 As shown, the first connection part 11 includes a connection plate 111 and a clamping protrusion 112, the connection plate 111 is connected to the main body 12, the connection plate 111 is provided with a mounting through hole 1110 penetrating along the second direction Y, and the connection plate 111 is provided with clamping protrusions 112 on both sides along the first direction X, wherein the second direction Y is perpendicular to the first direction X. In practical applications, the mounting through hole 1110 is used for bolts to pass through, and the clamping protrusion 112 is used for clamping with the front end plate 10. At this time, the first connection part 11 is fixed to the front end plate 10 by bolts and is also clamped on the front end plate 10, and the connection stability between the pull rod 40 and the front end plate 10 is better.

[0036] like Figure 2 As shown, the second connection part 13 includes a connection screw 131 and a nut 132. The connection screw 131 is connected to the main body 12, and the connection screw 131 is parallel to the first direction X. The nut 132 is connected to the connection screw 131. In practical applications, the rear end plate 20 is provided with a connection through hole penetrating along the first direction X, and the connection screw 131 passes through the connection through hole. The rear end plate 20 is located between the main body 12 and the nut 132, and the rear end plate 20 is clamped by the main body 12 and the nut 132. The second connection part 13 of this structure is compact and easy to connect with the rear end plate 20.

[0037] Furthermore, the rod body 1 is made of aluminum alloy, wherein the grade of the aluminum alloy may be: A380, A356-T6, Z101A, AlSi9Cu3 or AlSi10MnMg or other aluminum alloys with the same chemical composition, which have the characteristics of light weight and good economy.

[0038] Furthermore, the insulator 2 is made of plastic, which is also lightweight. The insulator 2 made of this material can be processed by powder spraying, dipping, secondary injection molding and other processes. Based on the above processes, the second positioning structure 23 can be formed simultaneously with the insulator 2, which is convenient for processing.

[0039] Specifically, the pull rod 40 is composed of a rod body 1 made of aluminum alloy and an insulator 2 made of plastic, which has the advantage of being lightweight and can make the fuel cell stack more lightweight.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A pull rod, suitable for a fuel cell stack, characterized in that: The invention comprises a rod body (1) and an insulator (2), wherein the rod body (1) comprises a first connecting portion (11), a main body (12) and a second connecting portion (13) which are sequentially connected along a first direction (X), wherein one of the first connecting portion (11) and the second connecting portion (13) is used to connect to a front end plate of the fuel cell stack, and the other is used to connect to a rear end plate of the fuel cell stack, wherein the insulator (2) is provided with a connecting hole (21) which passes through the first direction (X), and an outer wall of the insulator (2) is provided with a contact plane (22), and the contact plane (22) is used to contact the stack body of the fuel cell stack, wherein the main body (12) passes through the connecting hole (21), and the outer wall of the main body (12) contacts the hole wall of the connecting hole (21).

2. The pull rod according to claim 1, characterized in that: The rod body (1) has a first positioning structure (121), and the first positioning structure (121) is arranged on the outer wall of the main body (12); The insulator (2) has a second positioning structure (23), and the second positioning structure (23) is arranged on the hole wall of the connecting hole (21); The first positioning structure (121) and the second positioning structure (23) cooperate with each other to position and connect the rod body (1) and the insulator (2).

3. The pull rod according to claim 2, characterized in that: One of the first positioning structure (121) and the second positioning structure (23) is a positioning groove, and the other is a positioning protrusion.

4. The pull rod according to claim 1, characterized in that: The insulator (2) is a trapezoidal body, a cross section of the insulator (2) perpendicular to the first direction (X) is a trapezoidal surface, and the plane where the bottom of the trapezoidal surface lies is the contact plane (22).

5. The pull rod according to claim 4, characterized in that: The insulator (2) is provided with a weight-reducing groove (24) on the side surface adjacent to the contact plane (22).

6. The pull rod according to claim 1, characterized in that: The first connecting portion (11) comprises a connecting plate (111) and a clamping protrusion (112); the connecting plate (111) is connected to the main body (12); the connecting plate (111) is provided with a mounting through hole (1110) penetrating along a second direction (Y); the clamping protrusion (112) is provided on both sides of the connecting plate (111) along the first direction (X), wherein the second direction (Y) is perpendicular to the first direction (X).

7. The pull rod according to claim 1, characterized in that: The second connecting portion (13) comprises a connecting screw (131) and a nut (132); the connecting screw (131) is connected to the main body (12); and the nut (132) is connected to the connecting screw (131).

8. The pull rod according to claim 1, characterized in that: The rod body (1) is made of aluminum alloy.

9. The pull rod according to claim 1, characterized in that: The insulator (2) is made of plastic.

10. A fuel cell stack, characterized in that: It comprises a front end plate (10), a rear end plate (20), a battery stack body (30) and a pull rod as described in any one of claims 1 to 9, wherein the front end plate (10) and the rear end plate (20) are respectively in contact with the two ends of the battery stack body (30) along the first direction (X), and a plurality of pull rods (40) are provided, and one of the first connecting portion (11) and the second connecting portion (13) of each pull rod (40) is connected to the front end plate (10), and the other is connected to the rear end plate (20), the contact plane (22) of the insulator (2) is in contact with the battery stack body (30), and a plurality of pull rods (40) are arranged around the battery stack body (30).

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