A fuel cell stack stopper
By using multiple circular high-precision limiting posts and non-irregular limiting posts in the fuel cell stack design, combined with the ventilation hole structure, the problem of insufficient stacking neatness is solved, the reliability and production efficiency of the limiting device are improved, and the risk of limiting post deformation is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI XUHYDROGEN TIMES TECH CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-07-14
AI Technical Summary
Existing fuel cell stacking methods result in insufficient stacking neatness, complex limiting device structures, difficult operation, and easy deformation of the limiting columns, affecting uneven stress on internal components and the efficiency of sealing tests.
The design employs multiple circular high-precision limiting posts and non-irregularly shaped limiting posts, combined with a vent structure. Through stacked lower limiting combination, upper limiting combination, and pressing block combination, the limiting posts are ensured to remain undeformed, achieving precise limiting and sealing tests.
It improves the neatness of internal components of fuel cell stacks and the reliability of limiting devices, reduces the risk of deformation of limiting columns, simplifies the assembly process, and improves production efficiency and the convenience of sealing tests.
Smart Images
Figure CN224501930U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of fuel cell technology, specifically relating to a fuel cell stacking limiting device. Background Technology
[0002] A proton exchange membrane fuel cell stack is a device that generates electricity through an electrochemical reaction between hydrogen and oxygen. A fuel cell stack is a constrained assembly formed by stacking endplate components, bipolar plates, and membrane electrode assemblies in a specific number and sequence. Misalignment of these components during stacking can cause uneven stress within the fuel cell stack, gas leakage, and even short circuits. Therefore, employing a more reliable constraint method during fuel cell stacking is crucial.
[0003] In existing technologies, complex irregular-shaped limiting devices are commonly used, which are troublesome to disassemble and assemble, complicated to operate, and difficult to maintain. At the same time, during the pressing process after the fuel cell stack is stacked, each limiting post will be deformed to varying degrees, causing misalignment of the internal components of the fuel cell stack. The existing fuel cell stack stacking and sealing test are two separate processes, which is not time-efficient. Moreover, the current technology of stack limiting devices is very complex in structural design to meet the accuracy requirements, and assembly is difficult. Utility Model Content
[0004] This utility model provides a fuel cell stacking limiting device, the purpose of which is to provide a limiting device that can solve the problem of insufficient stacking neatness caused by existing stacking methods, thereby reducing the risk of uneven stress on various components inside the fuel cell stack, and improving the reliability and production efficiency of the fuel cell stacking limiting device.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A fuel cell stack limiting device for limiting the position of a fuel cell stack, comprising:
[0007] The stacking limiting lower assembly is located outside the fuel cell stack;
[0008] The upper stacking limit assembly is located on top of the lower stacking limit assembly;
[0009] The stacking block assembly is positioned above the stacking limit assembly.
[0010] The stacking and limiting assembly includes a tooling base plate, a limiting post base, and limiting posts; the tooling base plate is a rectangular plate; multiple limiting post bases are provided; multiple limiting post bases are symmetrically fixedly connected to the bottom perimeter of the fuel cell stack; each limiting post base is connected to a limiting post; the limiting post base is a columnar structure, with a through hole vertically opened on the side near the fuel cell stack for connecting the limiting post.
[0011] The number of limit post bases and limit posts is 3-8; the perpendicularity of the limit posts to the tooling base plate is 0.05-0.1mm.
[0012] The tooling base plate has a first threaded hole, a first pin hole, and a sliding groove for the limiting post base on its top surface, and a vent hole for connecting the fuel cell stack on its side, which communicates with the interior of the fuel cell stack. The limiting post base has a waist-shaped screw hole, a second pin hole, a second threaded hole, and a shaft hole that mates with the limiting post. The limiting post base is 0.1-3mm away from the edge of the fuel cell stack outline, and the edge of the limiting post outline extends 0.1-5mm beyond the edge of the limiting post base outline.
[0013] The bottom of the limiting post is provided with a thread with a diameter of 8-60mm that connects to the base of the limiting post; the number of vent holes is 3.
[0014] The stacking limiting assembly includes a bushing mounting plate and bushings; the bushing mounting plate has an octagonal structure with a symmetrical outer periphery and a rectangular hole at its center; 3-8 bushings are provided, and the bushings are symmetrically connected on both sides of the rectangular hole; one of the three bushings on each side is connected to the short side of the rectangular hole in the bushing mounting plate, and the other two are symmetrically connected to the long sides on both sides.
[0015] The bushing includes a connecting plate and a snap-fit component; the connecting plate is a semi-circular ring-shaped structure; the snap-fit component is a semi-circular ring-shaped structure; the snap-fit component is vertically disposed on the connecting plate, and the opening of the connecting plate coincides with the opening of the snap-fit component.
[0016] The opening profile of the rectangular hole in the middle of the bushing mounting plate is 1-5 mm larger than the profile of the fuel cell stack, and the profile of the stack block assembly is 1-10 mm smaller than the profile of the fuel cell stack.
[0017] The aforementioned briquette assembly includes a briquette mounting plate, support columns, and a pressure plate; the briquette mounting plate and the pressure plate are arranged parallel to each other vertically; multiple support columns are arranged vertically and symmetrically connected between the briquette mounting plate and the pressure plate.
[0018] The number of support columns for the press block assembly is 6-16; the flatness of the top and bottom surfaces of the press block assembly is 0.05-0.1mm, and the parallelism is 0.05-0.2mm.
[0019] Beneficial effects:
[0020] 1. This utility model sets multiple circular high-precision limiting posts and sets a limiting combination on the top of the limiting posts, so that the limiting posts do not deform when the fuel cell stack is stacked and pressed down, thereby solving the problem of insufficient stacking neatness caused by the existing stacking method and reducing the risk of uneven stress on the components inside the fuel cell stack.
[0021] 2. By using non-irregularly shaped limiting posts, this utility model avoids the micro-deformation of the limiting posts caused by processing, thereby making the fuel cell stacking limiting device more reliable.
[0022] 3. This utility model improves production efficiency by setting vent holes on the fuel cell stacking limiting device, so that the fuel cell stack can be tested for sealing after stacking.
[0023] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the structure of this utility model.
[0026] Figure 2 is a schematic diagram of the structure of the present invention after the stacking block combination is pressed down.
[0027] Figure 3 is a schematic diagram of the stacked and limited combination structure of this utility model.
[0028] Figure 4 is a schematic diagram of the stacked limiting combination in this utility model.
[0029] Figure 5 is a schematic diagram of the structure of the medium-pressure stack assembly of this utility model.
[0030] Figure 6 This is a schematic diagram of the structure of the bushing of this utility model.
[0031] Figure 7This is a schematic diagram of the tooling base plate in this utility model.
[0032] Figure 8 This is a schematic diagram of the structure of the limiting column base in this utility model.
[0033] In the picture:
[0034] 1. Lower stacking limit assembly; 11. Tooling base plate; 12. Limiting post base; 13. Limiting post; 111. First threaded hole; 112. First pin hole; 113. Limiting post base sliding groove; 114. Vent hole; 121. Waist screw hole; 122. Second pin hole; 123. Second threaded hole; 124. Shaft hole; 2. Upper stacking limit assembly; 21. Bushing mounting plate; 22. Bushing; 221. Connecting plate; 222. Snap-fit component; 3. Press block assembly; 31. Press block mounting plate; 32. Support post; 33. Pressure plate; 4. Fuel cell stack. Detailed Implementation
[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0036] Example:
[0037] according to Figure 1 Figure 5 shows a fuel cell stack limiting device used to limit the fuel cell stack 4, including...
[0038] Stacking limit lower assembly 1 is disposed outside the fuel cell stack 4;
[0039] Stacking limit upper assembly 2 is disposed on top of the stacking limit lower assembly 1;
[0040] Stacking block assembly 3 is positioned above stacking limit assembly 1.
[0041] In practical use, this utility model sets up a lower stacking limit assembly 1, an upper stacking limit assembly 2, and a pressing block assembly 3 to ensure that the lower stacking limit assembly 1 of the fuel cell stack 4 does not deform, thereby solving the problem of insufficient stacking neatness caused by the existing stacking method, reducing the risk of uneven stress on the internal components of the fuel cell stack 4, and thus making the fuel cell stacking limit device more reliable.
[0042] In practical applications, the connection method between the upper stacking limit combination 2 and the lower stacking limit combination 1 is plug-in.
[0043] The pressure block assembly 3 is positioned above the stacking limit assembly 1 and is used to apply downward pressure to the fuel cell stack 4 after the fuel cell stack 4 is stacked.
[0044] In some embodiments, the stacking limiting assembly 1 includes a tooling base plate 11, a limiting post base 12, and a limiting post 13; the tooling base plate 11 is a rectangular plate; multiple limiting post bases 12 are provided; multiple limiting post bases 12 are symmetrically fixedly connected to the bottom perimeter of the fuel cell stack 4; each limiting post base 12 is connected to a limiting post 13; the limiting post base 12 is a columnar structure, and a through hole for connecting the limiting post 13 is vertically opened on the side near the fuel cell stack 4.
[0045] Furthermore, the number of limit post bases 12 and limit posts 13 is 3-8; the perpendicularity of the limit post 13 to the tooling base plate 11 is 0.05-0.1mm. The straighter the limit post 13 and the tooling base plate 11 are, the higher the neatness of the fuel cell stack when stacked, and the less likely the internal components of the fuel cell stack will be skewed.
[0046] Furthermore, the tooling base plate 11 has a first threaded hole 111, a first pin hole 112, and a sliding groove 113 for the limiting post base on its top surface, and a vent hole 114 for connecting to the fuel cell stack 4 on its side, the vent hole 114 communicating with the interior of the fuel cell stack 4; the limiting post base 12 has a waist-shaped screw hole 121, a second pin hole 122, a second threaded hole 123, and a shaft hole 124 that mates with the limiting post 13; the limiting post base 12 is 0.1-3mm away from the outline edge of the fuel cell stack 4, and the outline edge of the limiting post 13 extends 0.1-5mm beyond the outline edge of the limiting post base 12. In practical applications, if the limiting post 13 does not extend beyond the limiting post base 12, it will not contact the fuel cell stack 4, avoiding its functional failure; if it extends too much, the required volume of the limiting post 13 will be larger, wasting materials and stack installation space.
[0047] Furthermore, the bottom of the limiting post 13 is provided with a thread with a diameter of 8-60mm that connects to the limiting post base 12; the number of the vent holes 114 is 3.
[0048] In actual use, the limit post base 12 is provided with a waist-shaped screw hole 121, a second pin hole 122 and a second threaded hole 123 for connecting the tooling base plate 11 and the limit post 13, and a shaft hole 124 for cooperating with the limit post 13.
[0049] This embodiment uses multiple circular high-precision limiting posts 13 and a stacking limiting assembly 2 on the top of the limiting posts 13 to prevent the limiting posts 13 from deforming when the fuel cell stack 4 is stacked and pressed down. This solves the problem of insufficient stacking neatness caused by existing stacking methods, thereby reducing the risk of uneven stress on the components inside the fuel cell stack 4. By using non-irregularly shaped limiting posts 13, micro-deformation of the limiting posts 13 due to processing is avoided, thus making the fuel cell stacking limiting device more reliable. By setting vent holes 114 on the fuel cell stacking limiting device, a sealing test can be performed immediately after the fuel cell stack is stacked, thereby improving production efficiency.
[0050] Specifically, the stacking limiting assembly 1 is located outside the fuel cell stack 4, and the limiting post 13 restricts the position of each component inside the fuel cell stack 4. The limiting post 13 and the shaft hole 124 of the limiting post base 12 are in transition fit, and the limiting post 13 and the shaft hole of the bushing 22 are in clearance fit.
[0051] The upper stacking limit assembly 2 is positioned on top of the lower stacking limit assembly 1, and the upper stacking limit assembly 2 is used to limit the position of the limit post 13.
[0052] In some embodiments, the stacking limiting assembly 2 includes a bushing mounting plate 21 and bushings 22; the bushing mounting plate 21 has an octagonal structure with a symmetrical outer periphery and a rectangular hole at its center; there are 3-8 bushings 22, which are symmetrically connected to both sides of the rectangular hole; one of the three bushings 22 on each side is connected to the short side of the rectangular hole in the bushing mounting plate 21, and the other two are symmetrically connected to the long sides on both sides.
[0053] In practical use, the four corners of the rectangular board can be cut at bevels, which saves materials and avoids accidental scratches.
[0054] Furthermore, the bushing 22 includes a connecting plate 221 and a snap-fit member 222; the connecting plate 221 is a semi-circular ring plate structure; the snap-fit member 222 is a semi-circular ring column structure; the snap-fit member 222 is vertically disposed on the connecting plate 221, and the opening of the connecting plate 221 coincides with the opening of the snap-fit member 222.
[0055] In actual use, the bushing 22 is connected to the bushing mounting plate 21 via the connecting plate 221, and the snap-fit part 222 is used to connect the limiting post 13. The stacking limiting upper assembly 2 and the stacking limiting lower assembly 1 are connected as one unit via the limiting post 13.
[0056] Furthermore, the opening profile of the rectangular hole in the middle of the bushing mounting plate 21 is 1-5 mm larger than the profile of the fuel cell stack 4, while the profile of the stacking block assembly 3 is 1-10 mm smaller than the profile of the fuel cell stack 4. During stack assembly, the fuel cell stack 4 is inserted into the center of the limiting post 13 through the rectangular hole at the center of the stacking limiting assembly 2. If the opening profile of the rectangular hole in the middle of the bushing mounting plate 21 is smaller than the profile of the fuel cell stack 4, the fuel cell stack 4 components cannot be inserted; the profile of the stacking block assembly 3 is 1-10 mm smaller than the profile of the fuel cell stack 4. After stack assembly, when the stacking block assembly 3 is pressed, it will pass through the rectangular hole at the center of the bushing mounting plate 21 of the stacking limiting assembly 2. If the rectangular opening is smaller than the stacking block assembly 3, it will cause an interference collision.
[0057] In actual use, the bushing mounting plate 21 is provided with a threaded hole for connecting to the bushing 22 and a shaft hole for cooperating with the bushing 22; the bushing 22 is provided with a screw hole for connecting to the bushing mounting plate 21 and a shaft hole for cooperating with the limiting post 13; the top inner side of the semi-circular hole of the snap fastener 222 is set in a stepped shape; the bushing 22 is made of a wear-resistant hard material, such as copper.
[0058] The bushing mounting plate 21 adopts the above-mentioned technical solution, which not only facilitates installation, but also ensures the stable operation of the fuel cell stack.
[0059] In some embodiments, the press block assembly 3 includes a press block mounting plate 31, support columns 32, and a pressure plate 33; the press block mounting plate 31 and the pressure plate 33 are arranged parallel to each other vertically; multiple support columns 32 are arranged vertically, and the multiple support columns 32 are symmetrically connected between the press block mounting plate 31 and the pressure plate 33.
[0060] Furthermore, the number of support columns 32 provided in the press block assembly 3 is 6-16; the flatness of the top surface of the press block assembly 3, i.e. the press block mounting plate 31, and the bottom surface of the press plate 33 are 0.05-0.1mm and the parallelism is 0.05-0.2mm.
[0061] In practical applications, the flatness and parallelism of the top and bottom surfaces of the stacking block assembly 3 directly affect the neatness of the stacked fuel cells. The flatter the top and bottom surfaces of the stacking block assembly 3, the higher the neatness of the stacked fuel cells.
[0062] Where there is no conflict, those skilled in the art can combine the relevant technical features in the above examples according to the actual situation to achieve the corresponding technical effects. Specific details of the various combinations will not be elaborated here.
[0063] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0064] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.
[0065] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modifications, equivalent variations, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the present invention.
Claims
1. A fuel cell stack limiting device for limiting the position of a fuel cell stack (4), characterized in that: include The stacking limiting lower assembly (1) is disposed outside the fuel cell stack (4); The upper stacking limit assembly (2) is disposed on top of the lower stacking limit assembly (1); The stacking block assembly (3) is positioned above the stacking limit assembly (1); The stacking limiting assembly (1) includes a tooling base plate (11), a limiting post base (12), and a limiting post (13); the tooling base plate (11) is a rectangular plate; multiple limiting post bases (12) are provided; multiple limiting post bases (12) are symmetrically fixedly connected to the bottom perimeter of the fuel cell stack (4); each limiting post base (12) is connected to a limiting post (13); the limiting post base (12) is a columnar structure, and a through hole for connecting the limiting post (13) is vertically opened on the side near the fuel cell stack (4).
2. The fuel cell stacking limiting device as described in claim 1, characterized in that: The number of limit post bases (12) and limit posts (13) is 3-8; the perpendicularity between the limit posts (13) and the tooling base plate (11) is 0.05-0.1mm.
3. The fuel cell stacking limiting device according to claim 1, characterized in that: The tooling base plate (11) has a first threaded hole (111), a first pin hole (112) and a sliding groove (113) for the limiting post base on its top surface, and a vent hole (114) for connecting the fuel cell stack (4) on its side. The vent hole (114) is connected to the interior of the fuel cell stack (4). The limiting post base (12) has a waist-shaped screw hole (121), a second pin hole (122) and a second threaded hole (123), and a shaft hole (124) that mates with the limiting post (13). The limiting post base (12) is 0.1-3 mm away from the outline edge of the fuel cell stack (4), and the outline edge of the limiting post (13) extends 0.1-5 mm beyond the outline edge of the limiting post base (12).
4. The fuel cell stacking limiting device according to claim 3, characterized in that: The bottom of the limiting post (13) is provided with a thread with a diameter of 8-60mm that connects to the limiting post base (12); the number of the vent holes (114) is 3.
5. The fuel cell stacking limiting device as described in claim 1, characterized in that: The stacking limit assembly (2) includes a bushing mounting plate (21) and bushings (22); the bushing mounting plate (21) has an octagonal structure with a symmetrical outer periphery and a rectangular hole at its center; there are 3-8 bushings (22), which are symmetrically connected on both sides of the rectangular hole; one of the three bushings (22) on each side is connected to the short side of the rectangular hole in the bushing mounting plate (21), and the other two are symmetrically connected to the long sides on both sides.
6. The fuel cell stacking limiting device as described in claim 5, characterized in that: The bushing (22) includes a connecting plate (221) and a snap-fit component (222); the connecting plate (221) is a semi-circular ring plate structure; the snap-fit component (222) is a semi-circular ring column structure; the snap-fit component (222) is vertically arranged on the connecting plate (221), and the opening of the connecting plate (221) coincides with the opening of the snap-fit component (222).
7. The fuel cell stacking limiting device as described in claim 5, characterized in that: The opening profile of the rectangular hole in the middle of the bushing mounting plate (21) is 1-5 mm larger than the profile of the fuel cell stack (4), and the profile of the stack block assembly (3) is 1-10 mm smaller than the profile of the fuel cell stack (4).
8. The fuel cell stacking limiting device as described in claim 1, characterized in that: The aforementioned briquette assembly (3) includes a briquette mounting plate (31), a support column (32), and a pressure plate (33); the briquette mounting plate (31) and the pressure plate (33) are arranged parallel to each other vertically; multiple support columns (32) are arranged vertically, and the multiple support columns (32) are symmetrically connected between the briquette mounting plate (31) and the pressure plate (33).
9. The apparatus according to claim 8, characterized in that, The number of support columns (32) provided in the press block assembly (3) is 6-16; the flatness of the top and bottom surfaces of the press block assembly (3) is 0.05-0.1mm, and the parallelism is 0.05-0.2mm.