Fuel cell stack pressing device

Abstract

A fuel cell stack pressing device comprises a front end plate, a rear end plate, a plurality of pull rods and a plurality of pressing nuts corresponding to the pull rods, the front end plate and the rear end plate are arranged at intervals, a containing space used for containing a fuel cell stack core is formed between the front end plate and the rear end plate, the pull rods are arranged on the periphery of the containing space, and the front end plate is provided with a plurality of clamping grooves corresponding to the pull rods. The rear end plate is provided with a plurality of rear holes which penetrate from the front to the rear and correspond to the pull rods, each pull rod comprises a front clamping plate, a main body part and a rear screw rod which are sequentially connected from front to back, the front clamping plates of the pull rods are clamped in the clamping grooves, the rear screw rods of the pull rods penetrate through the rear holes, and the compression nuts are in threaded connection with the rear screw rods; the front face of the compression nut abuts against the rear face of the rear end plate so that the size of the containing space can be adjusted through rotation. According to the utility model, the accommodating space is adjustable, so that the hold-down device can be adapted to hold down battery stacks with different length specifications, pull rods with various specifications do not need to be arranged, the cost of the hold-down device is reduced, and the hold-down device is convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a fuel cell stack pressing device. Background Art

[0002] A fuel cell is a power generation device that converts chemical energy in a fuel cell into electrical energy through an electrochemical reaction. The fuel cell core is composed of a certain number of bipolar plates and membrane electrode stacks in series. The stacked and assembled fuel cell core needs to be compressed under a certain compression force. After the compression is completed, the compression force on both sides of the battery stack is maintained by a compression device.

[0003] At present, the clamping device includes two end plates and multiple pull rods. The two end plates are respectively arranged on both sides of the battery stack. The two ends of the pull rods are respectively fixedly connected to the two end plates. A fixed-size accommodating space is formed between the two end plates. The battery stack is placed in the accommodating space, and the two end plates continuously compress the battery stack. However, since the types and compression amounts of the battery stacks are different, the lengths of the battery stacks are different, so the clamping device needs to be equipped with pull rods of various lengths, which leads to a high cost of the clamping device and troublesome installation. Utility Model Content

[0004] The utility model aims to provide a fuel cell stack clamping device to solve the technical problem that the clamping device cannot adapt to battery stacks of different length specifications through a pull rod of a single specification, thereby resulting in a high cost of the clamping device and troublesome installation.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a fuel cell stack clamping device, including a front end plate, a rear end plate, a plurality of tie rods and a plurality of clamping nuts corresponding to the tie rods, the front end plate and the rear end plate are spaced apart, and a storage space for placing the fuel cell stack core is formed therebetween, the tie rods are arranged at the periphery of the storage space, the front end plate is provided with a plurality of slots corresponding to the tie rods, the rear end plate is provided with a plurality of rear holes extending from the front to the back and corresponding to the tie rods, the tie rods include a front clamping plate, a main body and a rear screw rod connected in sequence from front to back, the front clamping plate of each tie rod is clamped in each slot, the rear screw rod of each tie rod passes through each rear hole, the clamping nut is threadedly connected to the rear screw rod, and the front of the clamping nut is against the back of the rear end plate so that the size of the storage space can be adjusted by rotation.

[0006] Optionally, it further comprises a plurality of connecting bolts, the front card plate is provided with a front through hole extending from the top surface to the bottom surface thereof, the connecting bolts and the front through holes correspond one to one, the card slot comprises a front slot and a rear slot which are sequentially arranged from front to back and are interconnected, the front slot extends to the front of the front end plate, the rear slot extends to the rear of the front end plate, and the slot bottom of the front slot is provided with a front threaded hole corresponding to the front through hole;

[0007] The front card plate is clamped in the front slot, the main body passes through the rear slot, and the connecting bolt passes through the front through hole and is connected to the front threaded hole to connect the front card plate and the front end plate.

[0008] Optionally, the width of the front card plate is greater than the width of the main body, the width of the front groove matches the width of the front card plate, and the width of the rear groove matches the width of the main body.

[0009] Optionally, the front card plate is provided with a plurality of front through holes.

[0010] Optionally, a plurality of anti-loosening nuts are further included, wherein the anti-loosening nuts are connected to the rear screw rod and are arranged behind the clamping nut.

[0011] Optionally, a rear threaded hole is provided at the rear end of the main body along its axial direction, and the front end of the rear screw is threadedly connected to the rear threaded hole.

[0012] Optionally, a limiting portion is provided on the outer side wall of the rear screw along its circumference, and the front of the limiting portion abuts against the rear of the main body.

[0013] Optionally, the pull rod further includes a plurality of reinforcing portions and ribs disposed on the outer side wall of the main body, the reinforcing portions extending along the axial direction of the main body, and the ribs connected to the main body and the reinforcing portions.

[0014] Optionally, a side surface of the reinforcement portion is coplanar with a side surface of the main body portion, and the side surface of the main body portion faces the accommodating space.

[0015] Optionally, the pull rods are arranged in parallel around the accommodating space.

[0016] Compared with the prior art, the fuel cell stack pressing device of the utility model has the following beneficial effects:

[0017] The utility model forms a storage space for placing a battery stack between the front end plate and the rear end plate, and the front end plate and the rear end plate are connected by a plurality of pull rods including a front clamping plate, a main body and a rear screw. Specifically, the front clamping plate is clamped in the clamping slot of the front end plate and fixedly connected to the front end plate, the rear screw passes through the rear hole of the rear end plate, and a clamping nut located behind the rear end plate is arranged on the rear screw, and the clamping nut is against the back of the rear end plate. The clamping nut can be adjusted by rotating its axial position on the rear screw. Furthermore, the clamping nut can be rotated to press the rear end plate forward to reduce the storage space. When the clamping nut is rotated until the front of the battery stack is attached to the back of the front end plate and the back of the battery stack is attached to the front of the rear end plate, the clamping nut is further rotated to clamp the battery stack. In summary, the storage space is adjustable, so that the clamping device can adapt to clamping battery stacks with different length specifications, and there is no need to be equipped with pull rods of various specifications, thereby reducing the cost of the clamping device and facilitating installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is an exploded view of the utility model.

[0020] Figure 3 for Figure 2 A partial enlarged view of part A in the middle.

[0021] Figure 4 for Figure 2 A partial enlarged view of part B in the middle.

[0022] Figure 5 It is a top view of the utility model.

[0023] Figure numerals: 1, front end plate; 11, card slot; 111, front slot; 112, rear slot; 12, front threaded hole; 2, rear end plate; 21, rear through hole; 3, pull rod; 31, front card plate; 311, front hole; 32, main body; 321, rear threaded hole; 33, rear screw; 34, reinforcement; 35, rib plate; 4, connecting bolt; 5, tightening nut; 6, anti-loosening nut; 7, battery stack. DETAILED DESCRIPTION

[0024] 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.

[0025] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] like Figures 1 to 5 As shown, a fuel cell stack clamping device of the utility model comprises a front end plate 1, a rear end plate 2, a plurality of tie rods 3 and a plurality of clamping nuts 5 corresponding to the tie rods 3, the front end plate 1 and the rear end plate 2 are spaced apart to form a storage space for placing a fuel cell stack core therebetween, the tie rods 3 are arranged at the periphery of the storage space, the front end plate 1 is provided with a plurality of slots 11 corresponding to the tie rods 3, the rear end plate 2 is provided with a plurality of rear holes 21 extending from the front to the back and corresponding to the tie rods 3, the tie rods 3 comprise a front clamping plate 31, a main body 32 and a rear screw 33 connected in sequence from front to back, the front clamping plate 31 of each tie rod 3 is clamped in each of the slots 11, the rear screw 33 of each tie rod 3 passes through each of the rear holes 21, the clamping nut 5 is threadedly connected to the rear screw 33, and the front of the clamping nut 5 abuts against the back of the rear end plate 2 so as to adjust the size of the storage space by rotation.

[0028] In the above technical scheme, since the front card plate 31 is connected to the front end plate 1, the positions of the pull rod 3 and the front end plate 1 are fixed. Since the front of the clamping nut 5 is against the back of the rear end plate 2, the clamping nut 5 limits the position of the rear end plate 2 in the front-to-back direction. The clamping nut 5 can be adjusted by rotating its axial position on the rear screw 33, so that the position of the pull rod 3 and the rear end plate 2 is adjustable. Specifically, the position of the rear end plate 2 in the front-to-back direction can be adjusted to adjust the size of the accommodating space. The process of loading the battery stack 7 into the accommodating space is as follows: adjust the clamping nut 5 backward, and push the rear end plate 2 to be attached to the clamping nut 5, so that the size of the accommodating space is larger than the length of the battery stack 7, place the battery stack 7 in the accommodating space, and then adjust the clamping nut 5 forward to reduce the size of the accommodating space, thereby clamping the battery stack 7, or, at the beginning, the clamping nut 5 is separated from the pull rod 3 and the rear end plate 2, the front of the battery stack 7 is pressed against the back of the front end plate 1, and the rear end plate 2 is connected to the pull rod 3 to form an accommodating space. The battery stack 7 is located in the accommodating space, and then the clamping nut 5 is connected to the pull rod 3, and the clamping nut 5 is adjusted forward to reduce the size of the accommodating space, thereby compressing the battery stack 7; wherein, the specific process of compressing the battery stack 7 is: the clamping nut 5 is rotated to press the rear end plate 2 forward to reduce the accommodating space. When the clamping nut 5 is rotated until the front of the battery stack 7 is attached to the back of the front end plate 1, and its back is attached to the front of the rear end plate 2, that is, the size of the accommodating space is equal to the length of the battery stack 7, the clamping nut 5 is further rotated to compress the battery stack 7. When the front end plate 1 and the rear end plate 2 compress the battery stack 7, the size of the accommodating space is not greater than the length of the battery stack 7. The size of the accommodating space refers to the length of the accommodating space in the front-to-back direction, and the length of the battery stack 7 refers to the length of the battery stack 7 in the front-to-back direction. In addition, the length of the main body 32 is less than the length of the battery stack 7 with the shortest length. In summary, the accommodating space is adjustable, so that the clamping device can accommodate battery stacks 7 with different length specifications, and there is no need to be equipped with pull rods 3 of various specifications, thereby reducing the cost of the clamping device.

[0029] Furthermore, it also includes a plurality of connecting bolts 4, the front card plate 31 is provided with a front through hole 311 that runs through from its top surface to the bottom surface, the connecting bolts 4 and the front through holes 311 correspond one to one, the card slot 11 includes a front slot 111 and a rear slot 112 that are arranged in sequence from front to back and are connected to each other, the front slot 111 runs through the front of the front end plate 1, the rear slot 112 runs through the rear of the front end plate 1, and the bottom of the front slot 111 is provided with a front threaded hole 12 corresponding to the front through hole 311; the front card plate 31 is clamped in the front slot 111, the main body 32 passes through the rear slot 112, and the connecting bolts 4 pass through the The front through hole 311 is connected to the front threaded hole 12 to connect the front card plate 31 and the front end plate 1, wherein the front groove 111 can facilitate the alignment of the pull rod 3 and is connected to the front end plate 1 to limit the pull rod 3 from moving backward, the rear groove 112 is used to allow the main body 32 to pass through, and the connecting bolt 4 limits the front card plate 31 to move in a direction perpendicular to the rear end plate 2; further, the specific size requirements for realizing the above-mentioned functions are that the width of the front card plate 31 is greater than the width of the main body 32, the width of the front groove 111 matches the width of the front card plate 31, and the width of the rear groove 112 matches the width of the main body 32.

[0030] Furthermore, in order to prevent the front clamping plate 31 from rotating along the axis of the front through hole 311 , the front clamping plate 31 is provided with a plurality of front through holes 311 , so that a plurality of connecting bolts 4 are installed on the front clamping plate 31 .

[0031] Furthermore, it also includes a plurality of anti-loosening nuts 6, wherein the anti-loosening nuts 6 are connected to the rear screw rod 33, and the anti-loosening nuts 6 are arranged behind the clamping nut 5 to prevent the clamping nut 5 from loosening.

[0032] Furthermore, the rear end of the main body 32 is provided with a rear threaded hole 321 along its axial direction, and the front end of the rear screw rod 33 is threadedly connected to the rear threaded hole 321, so that the rear threaded rod can be detachably connected to the main body 32, and the adjustable range of the accommodating space can be changed by replacing rear threaded rods of different specifications.

[0033] Furthermore, in order to reduce the accuracy requirement of the depth range of the rear threaded hole 321 and ensure that the portion of the rear screw 33 passing through the rear hole 21 has a specified length, a limiting portion is provided on the outer wall of the rear screw 33 along its circumference, and when the rear screw 33 is tightened, the front of the limiting portion abuts against the back of the main body 32, wherein the distance from the front of the limiting portion to the front of the rear screw 33 is not greater than the depth of the rear threaded hole 321.

[0034] Furthermore, in order to increase the strength of the main body 32, the pull rod 3 also includes a plurality of reinforcing portions 34 and rib plates 35 arranged on the outer wall of the main body 32, the reinforcing portion 34 is extended along the axial direction of the main body 32, and the rib plates 35 are connected to the main body 32 and the reinforcing portion 34, wherein the main body 32 and the reinforcing portion 34 can be rectangular blocks, and the rib plates 35 can be triangular plates.

[0035] Furthermore, one side surface of the reinforcing portion 34 is coplanar with one side surface of the main body 32, and this side surface of the main body 32 faces the accommodating space. When the battery stack 7 leans against the main body 32, the battery stack 7 can be supported from the side by the main body 32 and the reinforcing portion 34, thereby increasing the side support area and the pressure applied by the battery stack 7 to the main body 32.

[0036] Furthermore, the pull rods 3 are arranged in parallel around the accommodating space.

[0037] Furthermore, the specific connection methods of fixed setting and fixed connection refer to the relative position relationship of two components that can be fixedly connected, including fixing by connecting parts, fixing by welding, fixing by adhesives, fixing by integral molding, and fixing by snap connections.

[0038] Furthermore, the connecting parts include fasteners, straps, ties, pneumatic connecting elements, hydraulic connecting elements, flange plates, Velcro, and buttons.

[0039] In summary, the embodiment of the utility model provides a fuel cell stack pressing device, and its technical effects are:

[0040] The utility model forms a storage space for placing a battery stack between the front end plate and the rear end plate, and the front end plate and the rear end plate are connected by a plurality of pull rods including a front clamping plate, a main body and a rear screw. Specifically, the front clamping plate is clamped in the clamping slot of the front end plate and fixedly connected to the front end plate, the rear screw passes through the rear hole of the rear end plate, and a clamping nut located behind the rear end plate is arranged on the rear screw, and the clamping nut is against the back of the rear end plate. The clamping nut can be adjusted by rotating its axial position on the rear screw. Furthermore, the clamping nut can be rotated to press the rear end plate forward to reduce the storage space. When the clamping nut is rotated until the front of the battery stack is attached to the back of the front end plate and the back of the battery stack is attached to the front of the rear end plate, the clamping nut is further rotated to clamp the battery stack. In summary, the storage space is adjustable, so that the clamping device can adapt to clamping battery stacks with different length specifications, and there is no need to be equipped with pull rods of various specifications, thereby reducing the cost of the clamping device and facilitating installation.

[0041] 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 fuel cell stack pressing device, characterized in that: The invention comprises a front end plate (1), a rear end plate (2), a plurality of tie rods (3) and a plurality of clamping nuts (5) corresponding to the tie rods (3); the front end plate (1) and the rear end plate (2) are arranged at an interval, and a storage space for placing a fuel cell stack is formed between the two. The tie rods (3) are arranged on the periphery of the storage space. The front end plate (1) is provided with a plurality of slots (11) corresponding to the tie rods (3); the rear end plate (2) is provided with a plurality of rear holes (11) extending from the front to the rear and corresponding to the tie rods (3). 21), the pull rod (3) includes a front clamping plate (31), a main body (32) and a rear screw (33) connected in sequence from front to back, the front clamping plate (31) of each pull rod (3) is clamped in each clamping groove (11), the rear screw (33) of each pull rod (3) passes through each rear hole (21), the clamping nut (5) is threadedly connected to the rear screw (33), and the front of the clamping nut (5) is against the back of the rear end plate (2) so as to adjust the size of the accommodating space by rotation.

2. The fuel cell stack pressing device according to claim 1, characterized in that: It also includes a plurality of connecting bolts (4), the front card plate (31) is provided with a front through hole (311) extending from the top surface to the bottom surface thereof, the connecting bolts (4) and the front through holes (311) correspond one to one, the card slot (11) includes a front slot (111) and a rear slot (112) which are arranged in sequence from front to back and are interconnected, the front slot (111) extends to the front of the front end plate (1), the rear slot (112) extends to the rear of the front end plate (1), and the bottom of the front slot (111) is provided with a front threaded hole (12) corresponding to the front through hole (311); The front clamping plate (31) is clamped in the front groove (111), the main body (32) passes through the rear groove (112), and the connecting bolt (4) passes through the front through hole (311) and is connected to the front threaded hole (12) to connect the front clamping plate (31) and the front end plate (1).

3. The fuel cell stack pressing device according to claim 2, characterized in that: The width of the front card plate (31) is greater than the width of the main body (32), the width of the front groove (111) matches the width of the front card plate (31), and the width of the rear groove (112) matches the width of the main body (32).

4. The fuel cell stack pressing device according to claim 2, characterized in that: The front card plate (31) is provided with a plurality of front through holes (311).

5. The fuel cell stack pressing device according to claim 1, characterized in that: It also includes a plurality of anti-loosening nuts (6), wherein the anti-loosening nuts (6) are connected to the rear screw rod (33), and the anti-loosening nuts (6) are arranged behind the clamping nut (5).

6. The fuel cell stack pressing device according to claim 1, characterized in that: The rear end of the main body (32) is provided with a rear threaded hole (321) along its axial direction, and the front end of the rear screw rod (33) is threadedly connected to the rear threaded hole (321).

7. The fuel cell stack pressing device according to claim 6, characterized in that: A limiting portion is provided on the outer side wall of the rear screw rod (33) along its circumferential direction, and the front of the limiting portion abuts against the rear of the main body (32).

8. The fuel cell stack pressing device according to claim 1, characterized in that: The pull rod (3) also includes a plurality of reinforcing portions (34) and rib plates (35) arranged on the outer side wall of the main body (32), wherein the reinforcing portions (34) are extended along the axial direction of the main body (32), and the rib plates (35) are connected to the main body (32) and the reinforcing portions (34).

9. The fuel cell stack pressing device according to claim 8, characterized in that: A side surface of the reinforcing portion (34) is coplanar with a side surface of the main body portion (32), and the side surface of the main body portion (32) faces the accommodating space.

10. The fuel cell stack pressing device according to claim 1, characterized in that: The pull rods (3) are arranged in parallel around the accommodating space.

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