A sliding fixing device for a fuel cell stack

Abstract

The present invention relates to a sliding fixing device for a fuel cell stack, comprising a base and a plurality of stack brackets, wherein each stack bracket is fixedly connected to the base, the stack bracket is fixedly connected to a fixed plate of the fuel cell stack, the base comprises a fixed portion and a sliding portion, the fixed portion is fixedly connected to a PACK bottom plate of the fuel cell stack, and the sliding portion is slidably connected to the fixed portion. Compared with the prior art, in the present invention, the sliding range of the sliding portion and the fixed portion is determined according to the maximum dimensional difference of the thermal expansion and contraction of the stack, and the dimensional deviation caused by the thermal expansion and contraction of the bipolar plate of the stack at high and low temperatures is offset by the relative sliding of the sliding portion and the fixed portion, and the problem of uneven stress on the overall structure of the stack module is effectively avoided, and the structure is simple and the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of fuel cells, and in particular to a sliding type fixing device for a fuel cell stack. Background Art

[0002] A fuel cell is a chemical device that converts chemical energy into electrical energy by reacting fuel (hydrogen) with oxygen. A hydrogen fuel cell is generally composed of one or more stack modules, which are mainly composed of multiple bipolar plates and membrane electrodes stacked tightly together. Currently, hydrogen fuel cell systems are commonly used in passenger and freight vehicles, light trucks, medium and heavy trucks. As the power of hydrogen fuel cell systems required is increasing, a fuel cell system composed of multiple stack modules is required to meet the power requirements of the above models. However, when multiple stack modules form a fuel cell, the following problems will arise:

[0003] 1. When multiple stack modules are stacked, there will be errors in the hole positions. The reasons for the errors are, on the one hand, the product of the stack modules, and on the other hand, the processing errors of the fixing devices that match the stack modules.

[0004] 2. The bipolar plates in the stack module will expand and contract when the temperature changes, which will affect the overall size of the stack module. Stress will be generated after the stack module is fixed to the fixing device, causing uneven force on the overall structure of the stack module, which may lead to poor sealing of the stack and shorten the life of the stack.

[0005] Chinese patent CN108365250A discloses a fuel cell stack fixing device, which fixes multiple stack modules through a Z-shaped elastic structure design to prevent the graphite plates from being damaged by excessive force in a vibration environment and extend the life of the stack. However, the fixing device of the invention does not take into account that the stress caused by the thermal expansion and contraction of the stack in high and low temperature environments will also affect the life of the stack. Summary of the invention

[0006] The purpose of the present invention is to provide a sliding fixing device for a fuel cell stack in order to overcome the defects of the above-mentioned prior art. The relative sliding range of the sliding part and the fixing part is determined according to the limit size difference of the thermal expansion and contraction of the fuel cell stack. The relative sliding of the sliding part and the fixing part can offset the dimensional deviation of the bipolar plate of the fuel cell stack caused by the thermal expansion and contraction at high and low temperatures, and effectively avoid the problem of uneven force on the overall structure of the fuel cell stack module. The structure is simple and the cost is low.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A sliding fixing device for a fuel cell stack comprises a base and a plurality of stack brackets, wherein the stack brackets are respectively fixedly connected to the base, and the stack brackets are fixedly connected to the fixing plates of the fuel cell stack. The base comprises a fixing part and a sliding part, wherein the fixing part is fixedly connected to the PACK bottom plate of the fuel cell stack, and the sliding part is slidably connected to the fixing part.

[0009] Preferably, the fixing portion is composed of a plurality of rectangular tubes, including a first cross bar and two first vertical bars, and the fixing ends of the first vertical bars are connected to the ends of the first cross bar;

[0010] The sliding portion is composed of a plurality of rectangular tubes, including a second crossbar and two second vertical bars, wherein the fixed ends of the second vertical bars are connected to the ends of the second crossbar;

[0011] The free end of the second vertical rod is inserted into the free end of the first vertical rod, the first vertical rod is provided with a sliding bolt hole, the second vertical rod is provided with a sliding waist-shaped hole, the sliding bolt is fixedly installed to the sliding bolt hole and passes through the sliding waist-shaped hole, as the second vertical rod slides along the first vertical rod, the sliding bolt slides in the sliding waist-shaped hole, the length of the sliding waist-shaped hole is the sliding range of the sliding part along the fixed part, and the sliding range can be determined according to the limit size difference of thermal expansion and contraction of the bipolar plates of the fuel cell stack.

[0012] Preferably, two aligned sliding bolt holes are provided on the tube wall of the rectangular tube of the first vertical rod, and a sliding nut is provided outside one of the sliding bolt holes, and two aligned sliding waist-shaped holes are provided on the tube wall of the rectangular tube of the second vertical rod. During assembly, the second vertical rod is first inserted into the first vertical rod, so that the sliding bolt hole falls within the range of the sliding waist-shaped hole, and the sliding bolt is inserted. The sliding bolt passes through the sliding bolt hole-sliding waist-shaped hole-sliding waist-shaped hole in sequence and is threadedly connected with the sliding nut, thereby fixing the sliding bolt in the sliding bolt hole.

[0013] Preferably, the first cross bar is vertically connected to the first vertical bar, and the second cross bar is vertically connected to the second vertical bar.

[0014] Preferably, the diameter of the second vertical rod is smaller than that of the first vertical rod, and the second vertical rod can be just inserted into the first vertical rod.

[0015] Preferably, the free end of the second vertical rod is provided with a chamfer, so that the second vertical rod can more easily enter the first vertical rod without scratching the inner wall of the rectangular tube of the first vertical rod.

[0016] Preferably, the fixing part further includes two fixing connecting rods, both ends of which are connected to two first vertical rods respectively, and mounting holes are provided on the fixing connecting rods and the first vertical rods, and the fixing part is fixedly connected to the PACK bottom plate of the fuel cell stack through the mounting holes.

[0017] Preferably, the fixing portion is screwed to the PACK bottom plate of the fuel cell stack through the mounting hole, the mounting hole includes a bolt hole and a waist-shaped hole, with the location of the PACK bottom plate of the fuel cell stack as the bottom, the bolt hole is arranged on the upper side of the fixing connecting rod and the first vertical rod, the waist-shaped hole is arranged on the lower side of the fixing connecting rod and the first vertical rod, the bolt hole corresponds to the waist-shaped hole one by one and is aligned up and down;

[0018] During assembly, fixing bolts are used to fix the fixing part on the PACK bottom plate of the fuel cell stack. The bolt holes match the fixing bolts, and the fixing bolts pass through the bolt holes and the waist-shaped holes. The waist-shaped holes are easy to install and can eliminate assembly and processing errors.

[0019] Preferably, the first cross bar and the second cross bar are provided with bracket fixing holes, and the stack bracket is fixedly connected to the base through the bracket fixing holes.

[0020] Preferably, the number of the stack brackets is 4, and a bracket fixing hole is respectively provided at both ends of the first cross bar, and a bracket fixing hole is respectively provided at both ends of the second cross bar.

[0021] Preferably, the stack bracket includes an upper bracket and a lower bracket, the bottom of the lower bracket is fixedly connected to the base, the bottom of the upper bracket is fixedly connected to the top of the lower bracket, and the side plates of the upper bracket and the lower bracket are fixedly connected to the fixing plate of the fuel cell stack.

[0022] Preferably, with the sliding direction of the sliding part along the fixed part as the y-axis, and the direction perpendicular to the y-axis and parallel to the plane where the PACK bottom plate of the fuel cell stack is located as the x-axis, the bottom of the upper bracket is provided with an upper connecting waist-shaped hole, the length direction of the upper connecting waist-shaped hole is parallel to the y-axis, and the bottom of the upper bracket is fixedly connected to the top of the lower bracket through the upper connecting waist-shaped hole; the bottom of the lower bracket is provided with a lower connecting waist-shaped hole, the length direction of the lower connecting waist-shaped hole is parallel to the x-axis, and the bottom of the lower bracket is fixedly connected to the base through the lower connecting waist-shaped hole.

[0023] Preferably, the upper bracket and the lower bracket have different shapes, which can well distinguish the two components and avoid installation errors during the assembly process; the upper connecting waist-shaped hole of the upper bracket and the lower connecting waist-shaped hole of the lower bracket can offset the superposition error, and there is no need to rework or expand the hole of the battery stack bracket during assembly, thereby improving the assembly speed.

[0024] Preferably, the front side of the bracket fixing hole contacts with the lower connecting waist-shaped hole of the lower bracket, and the back side of the bracket fixing hole is provided with a base connecting nut. The base connecting bolt passes through the lower connecting waist-shaped hole and the bracket fixing hole, and is threadedly connected with the base connecting nut, thereby fixing the lower bracket on the base.

[0025] Preferably, a bracket connecting hole is provided on the top of the lower bracket, the front of the bracket connecting hole is in contact with the upper connecting waist-shaped hole at the bottom of the upper bracket, and a bracket connecting nut is provided on the back of the bracket connecting hole. The bracket connecting bolt passes through the upper connecting waist-shaped hole and the bracket connecting hole, and is threadedly connected with the bracket connecting nut, thereby fixing the upper bracket to the lower bracket.

[0026] Preferably, a through hole is provided on the fixing plate of the fuel cell stack, and the side plate is fixedly connected to the fixing plate of the fuel cell stack via a fixing plate, the length of the fixing plate is greater than the length of the through hole, and the side plate and the fixing plate are fixedly connected by fastening bolts, and the fixing plate of the fuel cell stack is clamped between the side plate and the fixing plate.

[0027] Preferably, the fixing plate is a metal plate on which a fastening nut is provided. One upper bracket corresponds to one fixing plate, and one lower bracket corresponds to one fixing plate. The side panels of the upper bracket and the lower bracket are provided with battery stack connecting holes. The fastening bolts pass through the battery stack connecting holes on the side panels and the through holes on the fixed plate of the fuel cell stack and are connected to the fastening nuts, thereby fixing the upper bracket and the lower bracket to the fixed plate of the fuel cell stack.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The sliding range of the sliding part and the fixed part is determined according to the maximum size difference of the thermal expansion and contraction of the battery stack. The relative sliding of the sliding part and the fixed part can offset the size deviation of the bipolar plate of the battery stack caused by the thermal expansion and contraction at high and low temperatures, and effectively avoid the problem of uneven stress on the overall structure of the battery stack module. The structure is simple and the cost is low.

[0030] (2) The sliding part and the fixed part are composed of a rectangular tube, and the second vertical rod of the sliding part is inserted into the first vertical rod of the fixed part. The structure is simple and the raw materials are easy to obtain, which reduces the manufacturing cost. The second vertical plate is chamfered, which makes it easier for the sliding part to enter the fixed part without scratching the inner wall of the rectangular tube of the fixed part, so as to avoid increasing the friction force and hindering the relative sliding between the fixed part and the sliding part.

[0031] (3) The stack bracket includes an upper bracket and a lower bracket. Both brackets are designed with waist-shaped holes to offset the stacking error. There is no need to repair or expand the holes of the stack bracket during assembly, which improves the assembly speed. In addition, there is no order restriction for the assembly of components such as the base and the stack bracket, which improves the assembly efficiency.

[0032] (4) The different shapes of the parts can avoid errors during assembly. The overall connection is made by welding and bolting, which is more reliable. There are no parts such as spring leaves with limited service life, so the service life is longer and it is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1It is a schematic diagram of the assembly of the sliding type fixing device and the fuel cell stack;

[0034] Figure 2 It is a schematic diagram of the base structure of the sliding type fixing device;

[0035] Figure 3 It is a schematic diagram of the base structure of the sliding type fixing device;

[0036] Figure 4 It is a schematic diagram of the assembly of the fixed part and the sliding part of the sliding type fixing device;

[0037] Figure 5 It is a structural schematic diagram of the mounting hole;

[0038] Figure 6 It is a schematic diagram of the structure of the stack bracket and the fuel cell stack;

[0039] Figure 7 It is a schematic diagram of the assembly of the stack bracket and the fuel cell stack;

[0040] Figure markings: 1. base, 2. battery stack bracket, 21. upper bracket, 211. upper connecting waist-shaped hole, 22. lower bracket, 221. lower connecting waist-shaped hole, 3. fuel cell stack, 4. fixing part, 41. first cross bar, 42. first vertical bar, 43. fixed connecting rod, 5. sliding part, 51. second cross bar, 52. second vertical bar, 521. chamfer, 61. sliding bolt hole, 62. sliding waist-shaped hole, 63. sliding bolt, 64. sliding nut, 7. mounting hole, 71. bolt hole, 72. waist-shaped hole, 8. bracket connecting hole, 9. fixing plate. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0042] In the drawings, components with the same structure are indicated by the same numerical labels, and components with similar structures or functions are indicated by similar numerical labels. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, some parts in the drawings are appropriately exaggerated.

[0043] In the description of the embodiments of the present application, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They 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 should not be understood as a limitation on the present application.

[0044] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0045] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] Embodiment 1:

[0047] A sliding fixing device for a fuel cell stack, such as Figure 1 As shown, it includes a base 1 and a plurality of stack brackets 2, each stack bracket 2 is fixedly connected to the base 1, and the stack bracket 2 is fixedly connected to the fixing plate of the fuel cell stack 3, as shown in FIG. Figures 2 to 4 As shown, the base 1 includes a fixed portion 4 and a sliding portion 5 , the fixed portion 4 is fixedly connected to the PACK bottom plate of the fuel cell stack 3 , and the sliding portion 5 is slidably connected to the fixed portion 4 .

[0048] like Figure 2 As shown, the fixed portion 4 is composed of a plurality of rectangular tubes, including a first cross bar 41 and two first vertical rods 42, and the fixed ends of the first vertical rods 42 are connected to the ends of the first cross bar 41; the sliding portion 5 is composed of a plurality of rectangular tubes, including a second cross bar 51 and two second vertical rods 52, and the fixed ends of the second vertical rods 52 are connected to the ends of the second cross bar 51;

[0049] like Figure 3As shown, the free end of the second vertical rod 52 is inserted into the free end of the first vertical rod 42, the first vertical rod 42 is provided with a sliding bolt hole 61, the second vertical rod 52 is provided with a sliding waist-shaped hole 62, the sliding bolt 63 is fixedly installed to the sliding bolt hole 61 and penetrates the sliding waist-shaped hole 62, as the second vertical rod 52 slides along the first vertical rod 42, the sliding bolt 63 slides in the sliding waist-shaped hole 62, and the length of the sliding waist-shaped hole 62 is the sliding range of the sliding part 5 along the fixed part 4, and the sliding range can be determined according to the limit size difference of the thermal expansion and contraction of the bipolar plate of the fuel cell stack 3. In this way, when the size of the fuel cell stack changes due to thermal barriers and contraction, the sliding part 5 will slide relative to the fixed part 4 to offset the size deviation caused by the thermal expansion and contraction of the bipolar plate of the fuel cell stack at high and low temperatures, and also effectively avoid problems such as uneven force on the overall structure of the fuel cell stack module.

[0050] In this embodiment, the fixed part 4 and the sliding part 5 are composed of rectangular tubes, and the stack bracket 2 is a sheet metal part. Therefore, the connection between the components is connected by bolt-nut connection. In other embodiments, if later replacement, disassembly, etc. are not considered, the components can also be directly welded, such as welding the sliding bolt 63 directly into the sliding bolt hole 61, etc.

[0051] like Figure 4 As shown, two aligned sliding bolt holes 61 are provided on the wall of the rectangular tube of the first vertical rod 42, one of the sliding bolt holes 61 is provided with a sliding nut 64, and the sliding nut 64 is welded to the outside of the wall of the rectangular tube. Two aligned sliding waist-shaped holes 62 are provided on the wall of the rectangular tube of the second vertical rod 52. During assembly, the second vertical rod 52 is first inserted into the first vertical rod 42, so that the sliding bolt hole 61 falls within the range of the sliding waist-shaped hole 62, and then the sliding bolt 63 is inserted. The sliding bolt 63 passes through the sliding bolt hole 61-sliding waist-shaped hole 62-sliding waist-shaped hole 62-sliding bolt hole 61 in sequence, and is screwed with the sliding nut 64, so that the sliding bolt 63 is fixed in the sliding bolt hole 61. In this embodiment, the sliding nut 64 is directly welded to the outside of a sliding bolt hole 61.

[0052] In this embodiment, the first cross bar 41 is vertically connected to the first vertical bar 42, and the second cross bar 51 is vertically connected to the second vertical bar 52. The diameter of the second vertical bar 52 is smaller than that of the first vertical bar 42, and is just inserted into the first vertical bar 42. The free end of the second vertical bar 52 is provided with a chamfer 521, so that the second vertical bar 52 can more easily enter the first vertical bar 42 without scratching the inner wall of the rectangular tube of the first vertical bar 42.

[0053] In order to facilitate the fixing of the base 1 on the PACK bottom plate of the fuel cell stack 3, as shown in FIG. Figure 2 , Figure 3As shown, the fixing part 4 also includes two fixing rods 43, the two ends of the fixing rods 43 are respectively connected to the two first vertical rods 42, and the fixing rods 43 and the first vertical rods 42 are both provided with mounting holes 7, and the mounting holes 7 on the first vertical rods 42 should not affect the sliding of the second vertical rods 52 in the first vertical rods 42, and the fixing part 4 is fixedly connected to the PACK bottom plate of the fuel cell stack 3 through the mounting holes 7. In other embodiments, the mounting holes 7 may also be provided only on the fixing rods 43.

[0054] like Figure 5 As shown, the fixing part 4 is screwed to the PACK bottom plate of the fuel cell stack 3 through the mounting hole 7. The mounting hole 7 includes a bolt hole 71 and a waist-shaped hole 72. With the position of the PACK bottom plate of the fuel cell stack 3 as the bottom, the bolt hole 71 is arranged on the upper side of the fixing connecting rod 43 and the first vertical rod 42, and the waist-shaped hole 72 is arranged on the lower side of the fixing connecting rod 43 and the first vertical rod 42. The bolt hole 71 corresponds to the waist-shaped hole 72 one by one and is aligned up and down. During assembly, the fixing bolt is used to fix the fixing part 4 on the PACK bottom plate of the fuel cell stack 3. The bolt hole 71 cooperates with the fixing bolt. The fixing bolt passes through the bolt hole 71 and the waist-shaped hole 72. The waist-shaped hole 72 is easy to install and can eliminate assembly and processing errors.

[0055] The first cross bar 41 and the second cross bar 51 are provided with a bracket fixing hole 8, and the battery stack bracket 2 is fixedly connected to the base 1 through the bracket fixing hole 8. In this embodiment, the number of battery stack brackets 2 is 4, and a bracket fixing hole 8 is provided at both ends of the first cross bar 41, and a bracket fixing hole 8 is provided at both ends of the second cross bar 51. In other embodiments, the number of battery stack brackets 2 can be changed according to actual needs, and more bracket fixing holes 8 can be provided on the first cross bar 41 and the second cross bar 51, so that the connection position of the battery stack bracket 2 and the base 1 can be flexibly changed.

[0056] like Figure 6 to Figure 7 As shown, the stack bracket 2 includes an upper bracket 21 and a lower bracket 22, the bottom of the lower bracket 22 is fixedly connected to the base 1, the bottom of the upper bracket 21 is fixedly connected to the top of the lower bracket 22, and the side panels of the upper bracket 21 and the lower bracket 22 are fixedly connected to the fixing plate of the fuel cell stack 3.

[0057] like Figure 6As shown, with the sliding direction of the sliding portion 5 along the fixed portion 4 as the y-axis, and the direction perpendicular to the y-axis and parallel to the plane of the PACK bottom plate of the fuel cell stack 3 as the x-axis, an upper connecting waist-shaped hole 211 is provided at the bottom of the upper bracket 21, and the length direction of the upper connecting waist-shaped hole 211 is parallel to the y-axis, and the bottom of the upper bracket 21 is fixedly connected to the top of the lower bracket 22 through the upper connecting waist-shaped hole 211; a lower connecting waist-shaped hole 221 is provided at the bottom of the lower bracket 22, and the length direction of the lower connecting waist-shaped hole 221 is parallel to the x-axis, and the bottom of the lower bracket 22 is fixedly connected to the base 1 through the lower connecting waist-shaped hole 221.

[0058] The front of the bracket fixing hole 8 contacts the lower connecting waist-shaped hole 221 of the lower bracket 22, and a base connecting nut is provided on the back of the bracket fixing hole 8. The base connecting bolt passes through the lower connecting waist-shaped hole 221 and the bracket fixing hole 8, and is screwed with the base connecting nut, thereby fixing the lower bracket 22 on the base 1. In this embodiment, the base connecting nut is directly welded to the back of the bracket fixing hole 8.

[0059] A bracket connection hole is provided on the top of the lower bracket 22, the front of the bracket connection hole contacts the upper connection waist-shaped hole 211 at the bottom of the upper bracket 21, and a bracket connection nut is provided on the back of the bracket connection hole. The bracket connection bolt passes through the upper connection waist-shaped hole 211 and the bracket connection hole, and is screwed with the bracket connection nut, thereby fixing the upper bracket 21 and the lower bracket 22. In this embodiment, the bracket connection nut is directly welded to the back of the bracket connection hole.

[0060] like Figure 7 As shown, a through hole is provided on the fixing plate of the fuel cell stack 3, and the side plate is fixedly connected to the fixing plate of the fuel cell stack 3 via a fixing plate 9, the length of the fixing plate 9 is greater than the length of the through hole, the side plate and the fixing plate 9 are fixedly connected by fastening bolts, and the fixing plate of the fuel cell stack 3 is clamped between the side plate and the fixing plate 9.

[0061] The fixing plate 9 is a metal plate, on which a fastening nut is provided. One upper bracket 21 corresponds to one fixing plate 9, and one lower bracket 22 corresponds to one fixing plate 9. The side plates of the upper bracket 21 and the lower bracket 22 are provided with a stack connection hole. The fastening bolts pass through the stack connection hole on the side plate and the through hole on the fixed plate of the fuel cell stack 3, and are connected with the fastening nuts, so that the upper bracket 21 and the lower bracket 22 are fixedly connected to the fixed plate of the fuel cell stack 3. In this embodiment, the direction of the fixing plate 9 toward the stack bracket 2 is taken as the front side, and two fastening nuts can be directly welded on the front side. The fastening bolts pass through the stack connection hole and the through hole in turn and are screwed on the fixing plate 9. The fastening nuts will not slip, and the structure is simple and convenient. Since the length of the fixing plate 9 is greater than the length of the through hole, the fixed plate of the fuel cell stack 3 is clamped between the side plate and the fixing plate 9, so that the fixed connection between the stack bracket 2 and the fixed plate of the fuel cell stack 3 is achieved.

[0062] Specifically, the structures of the upper bracket 21 and the lower bracket 22 are different. An upper connecting waist-shaped hole 211 is provided at the bottom of the upper bracket 21 (cooperating with the bracket connecting hole at the top of the lower bracket 22, and connecting the upper bracket 21 and the lower bracket 22 together through bracket connecting bolts and bracket connecting nuts), the side panel of the upper bracket 21 has a battery stack connecting hole, a bracket connecting hole is provided at the top of the lower bracket 22, and a lower connecting waist-shaped hole 221 is provided at the bottom of the lower bracket 22 (cooperating with the bracket fixing hole 8 of the base 1, and connecting the lower bracket 22 to the base 1 through base connecting bolts and base connecting nuts), and the side panel of the lower bracket 22 has a battery stack connecting hole.

[0063] In addition to the upper waist-shaped hole 211 and the lower waist-shaped hole 221, the shapes of the upper bracket 21 and the lower bracket 22 can be further changed. Figure 6 , making the upper bracket 21 and the lower bracket 22 have different shapes, so that the two components can be well distinguished and installation errors during assembly can be avoided as much as possible; the upper connecting waist-shaped hole 211 of the upper bracket 21 and the lower connecting waist-shaped hole 221 of the lower bracket 22 can offset the superposition error, and there is no need to rework or expand the battery stack bracket 2 during assembly, thereby improving the assembly speed.

[0064] The advantages of this application are:

[0065] The base 1 is welded from rectangular steel pipes, and the stack bracket 2 is welded from sheet metal parts. The raw materials are easy to obtain, require few processing techniques, and are cheap.

[0066] There are few types of parts. The base 1 includes a fixed part 4 and a sliding part 5. The stack bracket 2 includes an upper bracket 21 and a lower bracket 22. Moreover, the parts have different styles, which is easy to process and assemble, and the assembly process is not prone to errors.

[0067] The present application uses welded parts, sheet metal parts, etc., which are fixed by welding and bolt structures, which are easy to assemble, disassemble, replace and repair later. There are no parts with limited service life (such as spring leaves and other parts with limited life), and there is no need to replace parts regularly. The service life is long, the device is safer and more reliable, and the possibility of device failure due to damage to parts and then damaging the battery stack is greatly reduced.

[0068] The waist-shaped hole design of the upper bracket 21 and the lower bracket 22 can offset the stacking error, and there is no need to further repair or expand the hole of the stack bracket 2 during assembly, thereby improving the assembly speed. In addition, there is no mandatory installation order for the installation of components such as the stack bracket 2 and the base 1, and the installation efficiency is higher.

[0069] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A sliding fixing device for a fuel cell stack, characterized in that: The invention comprises a base (1) and a plurality of stack supports (2), each stack support (2) being fixedly connected to the base (1), the stack support (2) being fixedly connected to a fixed plate of a fuel cell stack (3), the base (1) comprising a fixed portion (4) and a sliding portion (5), the fixed portion (4) being fixedly connected to a PACK bottom plate of the fuel cell stack (3), and the sliding portion (5) being slidably connected to the fixed portion (4); The fixing portion (4) is composed of a plurality of rectangular tubes, including a first cross bar (41) and two first vertical bars (42), wherein the fixing ends of the first vertical bars (42) are connected to the ends of the first cross bar (41); The sliding portion (5) is composed of a plurality of rectangular tubes, including a second crossbar (51) and two second vertical bars (52), wherein the fixed ends of the second vertical bars (52) are connected to the ends of the second crossbar (51); The free end of the second vertical rod (52) is inserted into the free end of the first vertical rod (42); the first vertical rod (42) is provided with a sliding bolt hole (61); the second vertical rod (52) is provided with a sliding waist-shaped hole (62); a sliding bolt (63) is fixedly mounted to the sliding bolt hole (61) and passes through the sliding waist-shaped hole (62); as the second vertical rod (52) slides along the first vertical rod (42), the sliding bolt (63) slides in the sliding waist-shaped hole (62); The fuel cell stack support (2) comprises an upper support (21) and a lower support (22), the bottom of the lower support (22) is fixedly connected to the base (1), the bottom of the upper support (21) is fixedly connected to the top of the lower support (22), and the side plates of the upper support (21) and the lower support (22) are fixedly connected to the fixing plate of the fuel cell stack (3).

2. A sliding fixing device for a fuel cell stack according to claim 1, characterized in that: The free end of the second vertical rod (52) is provided with a chamfer (521).

3. The sliding fixing device for a fuel cell stack according to claim 1, characterized in that: The fixing portion (4) further comprises two fixing connecting rods (43), the two ends of the fixing connecting rods (43) being respectively connected to the two first vertical rods (42), the fixing connecting rods (43) and the first vertical rods (42) being provided with mounting holes (7), and the fixing portion (4) being fixedly connected to the PACK bottom plate of the fuel cell stack (3) via the mounting holes (7).

4. A sliding fixing device for a fuel cell stack according to claim 3, characterized in that: The mounting hole (7) comprises a bolt hole (71) and a waist-shaped hole (72), with the position of the PACK bottom plate of the fuel cell stack (3) being the lower side, the bolt hole (71) being arranged on the upper side of the fixed connecting rod (43) and the first vertical rod (42), and the waist-shaped hole (72) being arranged on the lower side of the fixed connecting rod (43) and the first vertical rod (42), and the bolt hole (71) and the waist-shaped hole (72) being in one-to-one correspondence and aligned up and down.

5. The sliding fixing device for a fuel cell stack according to claim 1, characterized in that: The first crossbar (41) and the second crossbar (51) are provided with bracket fixing holes (8), and the stack bracket (2) is fixedly connected to the base (1) via the bracket fixing holes (8).

6. A sliding fixing device for a fuel cell stack according to claim 5, characterized in that: The number of the stack brackets (2) is four, and a bracket fixing hole (8) is respectively provided at both ends of the first cross bar (41), and a bracket fixing hole (8) is respectively provided at both ends of the second cross bar (51).

7. The sliding fixing device for a fuel cell stack according to claim 1, characterized in that: With the sliding direction of the sliding portion (5) along the fixing portion (4) as the y-axis, and with the direction perpendicular to the y-axis and parallel to the plane where the PACK bottom plate of the fuel cell stack (3) is located as the x-axis, an upper connecting waist-shaped hole (211) is provided at the bottom of the upper bracket (21), the length direction of the upper connecting waist-shaped hole (211) is parallel to the y-axis, and the bottom of the upper bracket (21) is fixedly connected to the top of the lower bracket (22) through the upper connecting waist-shaped hole (211); and a lower connecting waist-shaped hole (221) is provided at the bottom of the lower bracket (22), the length direction of the lower connecting waist-shaped hole (221) is parallel to the x-axis, and the bottom of the lower bracket (22) is fixedly connected to the base (1) through the lower connecting waist-shaped hole (221).

8. The sliding fixing device for a fuel cell stack according to claim 1, characterized in that: A through hole is provided on the fixing plate of the fuel cell stack (3); the side plate is fixedly connected to the fixing plate of the fuel cell stack (3) via a fixing plate (9); the length of the fixing plate (9) is greater than the length of the through hole; the side plate and the fixing plate (9) are fixedly connected via fastening bolts; and the fixing plate of the fuel cell stack (3) is clamped between the side plate and the fixing plate (9).

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