Hydrogen fuel cell test short stack structure

Abstract

The invention discloses a hydrogen fuel cell test short reactor structure, which comprises a gas inlet end plate, a reactor core and a blind end plate, the reactor core is arranged between the gas inlet end plate and the blind end plate, the gas inlet end plate and the blind end plate are connected through a group of screw rod structures arranged around the gas inlet end plate and the blind end plate, a spring structure is arranged between the blind end plate and the reactor core, and the spring structure is connected with the blind end plate through a group of screw rod structures arranged around the gas inlet end plate and the blind end plate. And the spring structure is positioned on the inner side of one group of screw rod structures. A spring structure is additionally arranged between the floating end plate and the blind end plate on the short reactor, so that the stress state of the reactor core of the long reactor can be truly simulated, and the influence of assembly force attenuation on the performance and sealing of the reactor core is avoided; the puller bolts are uniformly distributed on the end plate at the blind end of the short reactor, so that the assembling force can be randomly adjusted according to the assembling force, the stress of the reactor core is relatively uniform, and sufficient contact of the active area of the reactor core is ensured; a threaded hole is machined in the air inlet end plate, the electric pile can be fixed by directly screwing a bolt through the threaded hole in the air inlet end plate, and assembling operation is easy and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel cells, and in particular to a short stack structure for testing hydrogen fuel cells. Background Art

[0002] Hydrogen fuel cells convert hydrogen and oxygen into electrical energy through electrochemical reactions under the action of catalysts. The final product is water. They have the advantages of high conversion efficiency, low noise and no pollution. They are considered to be one of the most important power development directions in the future and are widely favored in new energy vehicles, trams, portable power supplies and distributed power generation.

[0003] At present, the short stack structures used in domestic hydrogen fuel cell tests basically use bolts to fasten the front and rear end plates to provide assembly force for the stack. This simple stack form does not conform to the actual stress state of the core in a long stack. In a long stack, there will be a spring acting on the core to compensate for the impact of assembly force attenuation on core performance and sealing. The short stack structures used in domestic hydrogen fuel cell tests currently use rigid contact between the air intake end plate and the blind end plate and the core, which cannot compensate for the impact of assembly force attenuation on core performance and sealing, nor can it truly simulate the spring elastic contact form of a long stack. The short stack has fewer sections, and the edge effect brought by the rigid contact affects the stack performance.

[0004] In the traditional short stack structure used for hydrogen fuel cell testing, the use of a circle of bolted tie rods causes pressure on both sides of the end plates and a bulge in the middle, resulting in uneven force on the active area of ​​the core and less force on the middle active area. Even if the tie rods meet the force requirements, insufficient contact may still occur in the middle active area.

[0005] Furthermore, conventional short stacks used in hydrogen fuel cell testing are typically secured with bolts and nuts, requiring the use of a double wrench to tighten the bolts while also tightening the nuts. This complex and inconvenient method of securing the stacks is crucial.

[0006] For example, patent CN218447977U discloses a short stack structure suitable for membrane electrode testing, including an end plate, an electrode plate, an insulating plate between the electrode plate and the end plate, and a plurality of membrane electrode sealing assemblies arranged between the two electrode plates, wherein the membrane electrode to be tested is integrated in the middle position of the membrane electrode sealing assembly; the end plate is provided with a plurality of bolt holes along its circumference, and the short stack structure is clamped and fixed by the end plates at both ends and fastened with a plurality of bolts, and the bolt structure is arranged at the edge; the above-mentioned defects exist. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the present invention provides a short stack structure for testing a hydrogen fuel cell, so as to achieve the purpose of relatively uniform stress on the core.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] The hydrogen fuel cell test short stack structure includes an air intake end plate, a core and a blind end plate. The core is arranged between the air intake end plate and the blind end plate. The air intake end plate and the blind end plate are connected by a group of screw structures arranged around them. A spring structure is provided between the blind end plate and the core, and the spring structure is located inside a group of screw structures.

[0010] Further or preferred:

[0011] The spring structures are arranged in a matrix.

[0012] The core includes a current collecting plate structure, a floating end insulating plate and a floating end plate. The current collecting plate structure and the floating end insulating plate are arranged between the air inlet end plate and the floating end plate. The spring structure acts on the floating end plate.

[0013] The edge of the air inlet end plate is provided with a threaded hole, and the screw rod passes through the edge of the blind end plate and the end portion thereof is matched with the threaded hole.

[0014] A tightening structure is provided on the blind end plate corresponding to the spring structure.

[0015] The tightening structure is a tightening bolt, and a matching screw hole for the tightening bolt to pass through is provided on the blind end plate, and the end of the tightening bolt acts on the spring structure.

[0016] The spring structure is a coil spring, and a groove for positioning the inner end of the coil spring is provided on the floating end plate.

[0017] A spring washer is provided between the upper end of the spring structure and the inner end of the tightening bolt.

[0018] A groove is provided on the inner side of the blind end plate corresponding to the screw hole, and the spring washer is located in the groove.

[0019] The blind end plate and the floating end plate are both provided with corresponding press-fit holes, and the press-fit holes are located between a group of spring structures.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The short stack structure of the hydrogen fuel cell test is reasonably designed. A spring structure is added between the floating end plate and the blind end plate on the short stack, which can realistically simulate the stress state of the long stack core and avoid the impact of assembly force attenuation on the core performance and sealing; the tightening bolts are evenly distributed on the blind end plate of the short stack, and the assembly force can be adjusted arbitrarily according to the size of the assembly force. The stress on the core is relatively uniform, ensuring sufficient contact between the active area of ​​the core; threaded holes are processed on the air intake end plate, and the threaded holes on the air intake end plate can be used to directly tighten the bolts to fix the fuel cell stack, making the assembly operation simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following is a brief description of the contents and symbols in the drawings of this specification:

[0023] Figure 1 This is a schematic diagram of the explosion of the short stack structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the short stack structure assembly of the present invention.

[0025] Figure 3 This is a schematic cross-sectional view of the short stack structure of the present invention. Figure 1 .

[0026] Figure 4 This is a schematic cross-sectional view of the short stack structure of the present invention. Figure 2 .

[0027] In the picture:

[0028] 1. Tightening bolt, 2. Pull rod, 3. Blind end plate, 4. Spring washer, 5. Cathode current collecting plate, 6. Inlet end plate, 7. Spring, 8. Floating end plate, 9. Floating end insulation plate, 10. Anode current collecting plate, 11. Core, 12. Press-fit hole. DETAILED DESCRIPTION

[0029] Although the present invention is shown and described herein with reference to specific embodiments, it is not intended that the invention be limited to the details shown. Rather, various modifications may be made in the details within the scope and range of equivalents of the claims without departing from the present invention. In the accompanying drawings, the same item numbers refer to the same elements.

[0030] Various terms are used throughout this disclosure to describe the physical shape or arrangement of features. Many of these terms are used to describe features that conform to a cylindrical or generally cylindrical geometry with the feature as the radius and a central axis perpendicular to the radius. Unless a different meaning is specified, the terms are given the following meanings. The terms "longitudinal," "longitudinal," "axial," and "axially" refer to a direction, dimension, or orientation that is parallel to the central axis. The terms "radial" and "radially" refer to a direction, dimension, or orientation that is perpendicular to the central axis. The terms "inward" and "inwardly" refer to a direction, dimension, or orientation extending in a radial direction toward the central axis. The terms "outward" and "outwardly" refer to a direction, dimension, or orientation extending in a radial direction away from the central axis.

[0031] In the specification, relative terms such as "horizontal," "vertical," "upward," "downward," "top," and "bottom," and their derivatives (e.g., "horizontal," "downward," "upward," etc.) should be interpreted as referring to the direction being described or shown in the drawings being discussed. These relative terms are for convenience of description and are generally not intended to require a particular orientation.

[0032] The specific implementation of the present invention will be further explained in detail below through description of embodiments with reference to the accompanying drawings.

[0033] The short stack structure for hydrogen fuel cell testing of the present invention adopts a tightening elastic component. This structure can use the short stack structure to truly simulate the stress condition of the core in the long stack structure. The tightening elastic component can avoid the edge effect caused by the rigid structure of the core, and can also compensate for the impact of the assembly force attenuation on the core performance and sealing. The tightening elastic component is arranged in the middle of the end plate area, which avoids the middle area from bulging when the end plate is subjected to stress around it, so that the stress on the core is more uniform, ensuring sufficient contact between the active area of ​​the core. In addition, threaded holes are processed on the air intake end plate. When tightening the fuel cell stack, it is only necessary to use a wrench to tighten the bolts. No complicated operation is required. The structure is simple and the number of parts is small.

[0034] like Figures 1 to 4 As shown, the hydrogen fuel cell test short stack structure includes an air intake end plate 6, a core 11 and a blind end plate 3; the core is arranged between the air intake end plate and the blind end plate, and the air intake end plate and the blind end plate are connected by a group of screw structures arranged around them, that is, the air intake end plate and the blind end plate are tightened by a group of pull rods 2 structures arranged on the edge, so that the core is clamped in position, and the structure is stable and reliable; a spring structure is provided between the blind end plate and the core, and the spring structure is located on the inner side of a group of screw structures, and the force of the spring structure acts on the relatively central area of ​​the core.

[0035] The short stack structure of the hydrogen fuel cell test of the present invention is reasonably designed. A spring structure is added between the floating end plate and the blind end plate on the short stack, which can truly simulate the stress state of the long stack core and avoid the influence of assembly force attenuation on the core performance and sealing.

[0036] The spring structure is arranged in a matrix and is located in the middle between the air inlet end plate and the blind end plate. The addition of a spring structure in the end plate area prevents the middle area from bulging when the end plate is subjected to force in a circle around it, making the core more evenly stressed and ensuring sufficient contact between the active area of ​​the core.

[0037] The core includes a current collecting plate structure, a floating end insulating plate 9 and a floating end plate 8. The current collecting plate structure and the floating end insulating plate are arranged between the air inlet end plate and the floating end plate, and the spring structure acts on the floating end plate.

[0038] The air intake end plate, blind end plate, floating end plate and floating end insulation plate are all rectangular flat plate structures; the length and width of the air intake end plate and the blind end end plate are consistent, that is, after assembly, the edges of the air intake end plate and the blind end end plate are aligned; the length and width of the floating end plate and the floating end insulation plate are consistent, that is, after assembly, the edges of the floating end plate and the floating end insulation plate are aligned; the specifications of the floating end plate and the floating end insulation plate are smaller than those of the air intake end plate and the blind end end plate. After assembly, there is a gap between the edges of the floating end plate and the floating end insulation plate and the screw.

[0039] A tightening structure is provided on the blind-end endplate 3, corresponding to the spring structure. Preferably, the tightening structure is a tightening bolt 1. The blind-end endplate is provided with a mating screw hole for the tightening bolt, and the end of the tightening bolt acts on the spring structure. The tightening bolts are evenly distributed on the blind-end endplate of the short stack, allowing the assembly force to be adjusted arbitrarily according to the size of the assembly force. This ensures a relatively uniform force on the core and sufficient contact between the core active area.

[0040] Furthermore, the spring structure is a coil spring 7, with a groove on the floating end plate for positioning the inner end of the coil spring. A spring washer 4 is placed between the upper end of the spring structure and the inner end of the jack bolt. A groove is provided on the inner side of the blind end plate corresponding to the screw hole, and the spring washer is located in the groove. This ensures uniform force distribution and a stable and reliable structure.

[0041] The intake end plate has a threaded hole on its edge, through which a screw threaded rod passes. Both the blind and floating end plates have corresponding press-fit holes located between a set of spring structures. The intake end plate has threaded holes machined into it, allowing the stack to be secured by simply tightening bolts, making assembly simple.

[0042] like Figures 1 to 4 As shown, preferred embodiments of the present invention are:

[0043] The hydrogen fuel cell test short stack structure mainly includes a tightening bolt 1, a pull rod 2, a blind end plate 3, a spring washer 4, a cathode current collecting plate 5, an air intake end plate 6, a spring 7, a floating end plate 8, a floating end insulation 9, an anode current collecting plate 10, a core 11 and a press-fit hole 12.

[0044] Eight springs are added between the floating end plate and the blind end plate on the short stack to realistically simulate the stress state of the long stack core. When the core contracts, sufficient assembly force is still provided to the core to avoid the impact of assembly force attenuation on core performance and sealing. Tightening bolts are evenly distributed on the blind end plate of the short stack, acting on the spring pads above the eight springs. The assembly force can be adjusted arbitrarily according to the size of the assembly force, so that the stress on the core is relatively uniform and sufficient contact is ensured in the active area of ​​the core. Threaded holes are machined on the metal portion of the air inlet end plate, so that bolts can be directly tightened into the threaded holes, thus fixing the stack.

[0045] The assembly process of the short stack structure of the hydrogen fuel cell test of the present invention is as follows:

[0046] Place the cathode current collecting plate inside the groove of the air intake end plate, stack the bipolar plates and membrane electrodes in the core in sequence and place them on the cathode current collecting plate, fix the anode collecting plate on the floating end plate, place the fixed whole on the core, place the spring inside the groove on the floating end plate, place the spring gasket on the spring, place the blind end plate on the spring, and pass the pull rod through the through hole on the blind end plate.

[0047] The pressure head of the press passes through the press-fitting hole and acts on the floating end plate. A specific pressure is set on the press to press the entire short stack. The pull rod is screwed onto the air inlet end plate, and the tightening bolt is screwed into the threaded hole of the blind end plate. By controlling the depth of the tightening bolt, the assembly force of the entire core can be controlled.

[0048] A pressure sensor is provided between the floating end insulation and the floating end plate, and the pressure condition is detected by the pressure sensor.

[0049] Furthermore, the pressure sensor is a group of pressure sensors, and the pressure sensor is arranged corresponding to each spring structure; specifically, a group of pressure sensors consists of eight pressure sensors, and each pressure sensor is arranged corresponding to the groove on the floating end plate, that is, each pressure sensor is aligned with the corresponding spring end, and the pressure conditions in each area are detected by a group of pressure sensors, and the corresponding tightening bolts are adjusted according to the pressure conditions in different areas; that is, during the later use of the short stack structure, it can be adjusted according to actual conditions, so that the force on the core is relatively uniform, ensuring sufficient contact between the active areas of the core.

[0050] The above is only an illustration of a preferred embodiment of the present invention. The above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0051] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A short stack structure for testing a hydrogen fuel cell, comprising an intake end plate, a core, and a blind end plate, wherein the core is disposed between the intake end plate and the blind end plate, and the intake end plate and the blind end plate are connected by a set of screw structures disposed around them, characterized in that: A spring structure is provided between the blind end plate and the core, and the spring structure is located inside a group of screw structures.

2. The hydrogen fuel cell test short stack structure according to claim 1, characterized in that: The spring structures are arranged in a matrix.

3. The short stack structure for testing a hydrogen fuel cell according to claim 1, wherein: The core includes a current collecting plate structure, a floating end insulating plate and a floating end plate. The current collecting plate structure and the floating end insulating plate are arranged between the air inlet end plate and the floating end plate. The spring structure acts on the floating end plate.

4. The hydrogen fuel cell test short stack structure according to claim 1, characterized in that: The edge of the air inlet end plate is provided with a threaded hole, and the screw rod passes through the edge of the blind end plate and the end portion thereof is matched with the threaded hole.

5. The hydrogen fuel cell test short stack structure as claimed in claim 3, characterized in that: A tightening structure is provided on the blind end plate corresponding to the spring structure.

6. The hydrogen fuel cell test short stack structure according to claim 5, characterized in that: The tightening structure is a tightening bolt, and a matching screw hole for the tightening bolt to pass through is provided on the blind end plate, and the end of the tightening bolt acts on the spring structure.

7. The hydrogen fuel cell test short stack structure according to claim 5, characterized in that: The spring structure is a coil spring, and a groove for positioning the inner end of the coil spring is provided on the floating end plate.

8. The short stack structure for testing a hydrogen fuel cell according to claim 6, wherein: A spring washer is provided between the upper end of the spring structure and the inner end of the tightening bolt.

9. The hydrogen fuel cell test short stack structure according to claim 8, characterized in that: A groove is provided on the inner side of the blind end plate corresponding to the screw hole, and the spring washer is located in the groove.

10. The hydrogen fuel cell test short stack structure according to claim 3, characterized in that: The blind end plate and the floating end plate are both provided with corresponding press-fit holes, and the press-fit holes are located between a group of spring structures.

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