Reactor core stacking limiting device of hydrogen fuel cell stack

Abstract

The utility model discloses a hydrogen fuel cell stack core stacking limiting device which comprises a packaging body, the top end of the packaging body is detachably connected with a first fixing frame and a second fixing frame, the two ends of the first fixing frame and the two ends of the second fixing frame are in contact to form a limiting frame, a stacking space is arranged in the middle of the limiting frame, and the top of a stack core is located in the stacking space. By adopting the stack limiting device for the stack core of the hydrogen fuel cell stack disclosed by the utility model, the stack core is prevented from overturning, and the safety risk is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of battery cell stacking, and specifically, the utility model relates to a stacking limiting device for a hydrogen fuel cell stack core. Background Art

[0002] A hydrogen fuel cell converts hydrogen and oxygen into electric energy through an electrochemical reaction under the action of a catalyst, and the final product is water. It has the advantages of high conversion efficiency, low noise, and no pollution, and is considered to be one of the most important future power development directions. When assembling the stack, the bipolar plates and membrane electrodes are stacked one by one along the core direction. Since the adhesive line and the carbon paper of the membrane electrode are not compressed at the beginning stage, the height of the core in the uncompressed state exceeds the height of the encapsulation body. When the press presses the core, it is necessary to use an external tooling to limit the core to prevent slippage or collapse between the bipolar plates in the compressed state.

[0003] The traditional hydrogen fuel cell core uses plastic positioning rods to fix the bipolar plates and membrane electrodes. When pressing a high-power core, when the press head is not in the middle of the core, it is very easy to cause the core to overturn. After pressing, the plastic positioning rods are usually cut off and left in the core. When condensate water is generated, it will cause a short circuit between the bipolar plates along the positioning rods, which is very likely to cause an electrical safety risk.

[0004] The utility model patent with the publication number CN209804810U disclosed a stacking structure of a fuel cell with the name of "A Stacking Structure of a Fuel Cell" on December 17, 2021. The stacking structure of the fuel cell includes a plurality of bipolar plates and fuel cells, and the plurality of bipolar plates and fuel cells are stacked alternately to form a stacking structure. Both the upper and lower ends of the stacking structure are bipolar plates, and fixing frames are provided on the outer side walls of the bipolar plates and fuel cells, and four mounting holes are symmetrically provided in the fixing frames. The stacking structure of the fuel cell cannot achieve the limitation of the stacking of battery cells. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a stacking limiting device for a hydrogen fuel cell stack core that can avoid the overturning of the core and reduce the safety risk in view of the deficiencies of the prior art.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] The stacking limiting device for a hydrogen fuel cell stack core includes an encapsulation body. A first fixing frame and a second fixing frame are detachably connected to the top end of the encapsulation body. The two ends of the first fixing frame and the second fixing frame are in contact to form a limiting frame. A stacking space is provided in the middle of the limiting frame, and the top of the core is located in the stacking space.

[0008] The first fixing frame is provided with a clamping groove, and a fixing rod is arranged in the clamping groove. The second fixing frame is provided with a support, and an adjusting rod is arranged on one side of the support. The second fixing frame and the support are threadedly connected with a tightening bolt, and the end of the tightening bolt contacts the adjusting rod.

[0009] The fixing rod and the adjusting rod are arranged oppositely, and the fixing rod and the adjusting rod have the same length. The fixing rod and the adjusting rod are higher than the reactor core.

[0010] Positioning bosses are arranged at the bottoms of the fixing rod and the adjusting rod, and the positioning bosses contact the inner side of the top end of the encapsulation body.

[0011] Both the first fixing frame and the second fixing frame are provided with connection holes, and the first fixing frame is provided with positioning holes.

[0012] Both the first fixing frame and the second fixing frame are provided with convex blocks.

[0013] The connection holes are evenly distributed, and the positioning holes are arranged in pairs.

[0014] The technical effect of the present utility model is as follows: By using the stacking limiting device for the reactor core of the hydrogen fuel cell stack of the present utility model, the limiting device is accurately positioned on the encapsulation body by using positioning pins and fastening bolts. Through the pushing action of the tightening bolt on the adjusting rod, the size of the stacking space can be adjusted, meeting the limiting requirements in four directions for the stack, ensuring that the reactor core can be in an accurate pressing position, avoiding the risk of the reactor core tipping due to uneven force during pressing or local sliding between bipolar plates resulting in seal failure, and ensuring reliable packaging quality of the battery. Before the pressing head presses the reactor core, the fixing rods and adjusting rods around the reactor core can be removed, avoiding the risk of condensate water entering between the bipolar plates and causing electrical safety risks during pressing. The device has a simple structure, is easy to use, can be removed after pressing, and has the effect of being reusable. Description of the Drawings

[0015] This specification includes the following drawings, and the shown contents are respectively:

[0016] Figure 1 is the installation schematic diagram of the stacking limiting device for the reactor core of the hydrogen fuel cell stack of the present utility model;

[0017] Figure 2 is the structural schematic diagram of the limiting frame of the present utility model;

[0018] Figure 3 is the structural schematic diagram of the first fixing frame of the present utility model;

[0019] Figure 4 is the structural schematic diagram of the second fixing frame of the present utility model.

[0020] In the figure, the marked parts are: 1. encapsulation body; 2. core; 3. first fixing frame; 4. second fixing frame; 5. limiting frame; 6. stacking space; 7. fixing rod; 8. adjusting rod; 9. clamping groove; 10. support; 11. tightening bolt; 12. positioning boss; 13. connecting hole; 14. positioning hole; 15. convex block; 16. fastening bolt. Detailed implementation mode

[0021] The following is a more detailed description of the specific implementation mode of the present utility model by referring to the accompanying drawings and describing the embodiments, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and facilitate its implementation.

[0022] As Figures 1 to 4 shown, this hydrogen fuel cell stack core stacking limiting device includes an encapsulation body 1. The top of the encapsulation body 1 is detachably connected with a first fixing frame 3 and a second fixing frame 4. The two ends of the first fixing frame 3 and the second fixing frame 4 are in contact to form a limiting frame 5. A stacking space 6 is provided in the middle of the limiting frame 5, and the top of the core 2 is located in the stacking space 6. The first fixing frame 3 and the second fixing frame 4 are in contact to form the limiting frame 5 and form the stacking space 6 for the core 2. The stacking space 6 limits the core 2 in four directions, avoiding the risk of seal failure caused by local slippage due to overpressure between bipolar plates during press-fitting. The setting of the limiting frame 5, the fixing rod 7 and the adjusting rod 8 extends the height of the encapsulation body 1, meeting the encapsulation requirements when the stacking height of the core 2 in the uncompressed state is higher than that of the encapsulation body 1.

[0023] As Figure 3 and Figure 4As shown, a first fixing frame 3 is provided with a slot 9, a fixing rod 7 is provided in the slot 9, a second fixing frame 4 is provided with a support 10, an adjusting rod 8 is provided on one side of the support 10, and a tightening bolt 11 is threadedly connected to the second fixing frame 4 and the support 10, and the end of the tightening bolt 11 contacts the adjusting rod 8. The slot 9 is clamped and fixed to the fixing rod 7, that is, the distance in two directions of the first fixing frame 3 is fixed, and the tightening bolt 11 can push the adjusting rod 8 to move by rotating, and the tightening bolt 11 is arranged in pairs to make the adjusting rod 8 aligned as a whole, that is, the distance in two directions of the second fixing frame 4 is adjustable. Compared with the traditional design of the core 2 fixing method, the stacking space 6 can be changed in size, avoiding the use of a fixed distance to cause the core 2 edge and the device to have too small a distance, resulting in overpressure on the edge of the bipolar plate and curling. The fixing rod 7 and the adjusting rod 8 are not fixedly connected, and can be removed in time before the core 2 is pressed, avoiding the electrical safety risk of the rod remaining inside the stack and causing a short circuit between the bipolar plates. The outer side of the fixing rod 7 extends out of the slot 9, that is, the side of the fixing rod 7 is not in the same plane with the inner side of the first fixing frame 3, and the adjusting rod 8 is located on the side of the support 10, that is, the side of the adjusting rod 8 is not in the same plane with the inner side of the second fixing frame 4; therefore, after removing the fixing rod 7 and the adjusting rod 8 before pressing, there is a certain space margin between the press head and the two fixing frames, so the two fixing frames will not interfere with the operation of the press head.

[0024] like Figure 2 As shown, the fixing rod 7 and the adjusting rod 8 are arranged oppositely, the fixing rod 7 and the adjusting rod 8 are of the same length, and the fixing rod 7 and the adjusting rod 8 are higher than the core 2. Since the fixing rod 7 and the adjusting rod 8 are arranged oppositely and the first fixing frame 3 and the second fixing frame 4 form the limiting frame 5 after installation, there are three fixing rods 7 and three adjusting rods 8, two pairs of fixing rods 7 and adjusting rods 8 are arranged in the long side direction of the limiting frame 5 and are arranged oppositely, and one pair of fixing rods 7 and adjusting rods 8 are respectively arranged in the short side direction of the limiting frame 5 and are arranged oppositely. This design can form restrictions in four directions during the stacking limiting process of the core 2, which is conducive to making the side of the core 2 neat and consistent and ensuring that the core 2 moves to the accurate press-fitting position. The fixing rod 7 and the adjusting rod 8 have the same specifications and are more convenient to use. Both are higher than the core 2, which can prevent the bipolar plate located at the top of the core 2 from escaping from the stacking space 6.

[0025] like Figure 3 and Figure 4 As shown, the bottom of the fixing rod 7 and the adjusting rod 8 are both provided with a positioning boss 12, and the positioning boss 12 contacts the inner side of the top of the package body 1. When the positioning boss 12 is provided, the fixing rod 7 and the adjusting rod 8 form a positioning step, so that the fixing rod 7 and the adjusting rod 8 are initially positioned when they are installed, ensuring that they are in an aligned posture after installation, ensuring that the position of the core 2 is accurate during the process of limiting the position, and also making it convenient for operators to judge whether the fixing rod 7 and the adjusting rod 8 are installed in place during installation.

[0026] like Figure 3and Figure 4 As shown in Figure 4 , connection holes 13 are provided on both the first fixing bracket 3 and the second fixing bracket 4, and a positioning hole 14 is provided on the first fixing bracket 3. The positioning hole 14 is used for preliminary positioning during the installation of the first fixing bracket 3. The connection hole 13 can be connected to a fastening bolt 16 of M6x25, so as to stably install the two fixing brackets on the encapsulation body 1, which is convenient for installation and disassembly and can be reused.

[0027] As Figure 3 and Figure 4 shown in Figure 3 and Figure 4 , bumps 15 are provided on both the first fixing bracket 3 and the second fixing bracket 4. The bump 15 is an integral structure with the fixing bracket. The design of the bump 15 is used to avoid reducing the structural strength of the two fixing brackets due to the design of the slot 9 or the connection of the support 10; the positioning bosses 12 located at both ends of the first fixing bracket 3 and the second fixing bracket 4 expand the contact area between the two, which is beneficial to improving the stability of the two fixing brackets. Among them, the slot 9 located at the short side position of the limit frame 5 is formed by splicing two bumps 15.

[0028] As Figure 3 and Figure 4 shown in Figure 3 and Figure 4 , the connection holes 13 are evenly distributed, and the positioning holes 14 are arranged in pairs. Through a plurality of fastening bolts 16 and positioning pins, it is convenient to stably install the limit device.

[0029] The implementation process is as follows: Stack the bipolar plates and membrane electrodes one by one inside the encapsulation body 1 in sequence to form the final stack core 2. Then install the first fixing bracket 3 and the second fixing bracket 4. Align the positioning holes 14 on the first fixing bracket 3 and the second fixing bracket 4 with the positioning pins on the encapsulation, place them on the top of the encapsulation body 1, and fasten them with bolts of M6×25; Since the stack core 2 has not been compressed yet, the height of the stack core 2 exceeds the height of the encapsulation body 1. Turn the tightening bolt 11 to push the adjusting rod 8 against the stack core 2. The stack core 2 is pushed by the adjusting rod 8 to make the other side of it close to the fixing rod 7, so as to achieve the fixation of the stack core 2 in four directions. Then remove the fixing rod 7 and the adjusting rod 8. When the press presses the stack core 2, the stack core 2 is evenly stressed and will not overturn, ensuring the reliable press-fitting quality of the stack core 2 of the fuel cell stack. After the fixing rod 7 and the adjusting rod 8 are removed, condensate water will not enter between the bipolar plates along the rods, thus causing an electrical safety risk; After the stack core 2 is press-fitted, its height decreases, and then the first fixing bracket 3 and the second fixing bracket 4 can be removed to achieve the effect of repeated use.

[0030] The hydrogen fuel cell stack core stacking limiting device uses a positioning pin and a fastening bolt 16 to accurately position the limiting device on the packaging body 1. Through the pushing action of the top bolt 11 on the adjusting rod 8, the size of the stacking space 6 is adjustable, which meets the limitation of the stack in four directions, ensures that the core 2 can be in an accurate press-fitting position, avoids the risk of overturning of the core 2 due to uneven force or local slippage between the bipolar plates during press-fitting, and causes sealing failure, and ensures the reliable packaging quality of the battery; before the pressure head presses the core 2, the fixing rod 7 and the adjusting rod 8 around the core 2 can be withdrawn, and when pressing, condensed water is prevented from entering between the bipolar plates and causing electrical safety risks. The device has a simple structure, is easy to use, can be disassembled after press-fitting, and has the effect of repeated use.

[0031] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A hydrogen fuel cell stack core stacking limiter, characterized in that: The invention comprises a packaging body (1), wherein a first fixing frame (3) and a second fixing frame (4) are detachably connected to the top of the packaging body (1), the first fixing frame (3) and the second fixing frame (4) are in contact at both ends to form a limiting frame (5), a stacking space (6) is provided in the middle of the limiting frame (5), and the top of the core (2) is located in the stacking space (6).

2. The hydrogen fuel cell stack core stacking limiting device according to claim 1, characterized in that: The first fixing frame (3) is provided with a slot (9), a fixing rod (7) is provided in the slot (9), the second fixing frame (4) is provided with a support (10), an adjusting rod (8) is provided on one side of the support (10), the second fixing frame (4) and the support (10) are threadedly connected with a tightening bolt (11), and the end of the tightening bolt (11) is in contact with the adjusting rod (8).

3. The hydrogen fuel cell stack core stacking limiting device according to claim 2, characterized in that: The fixing rod (7) and the adjusting rod (8) are arranged opposite to each other, the fixing rod (7) and the adjusting rod (8) have the same length, and the fixing rod (7) and the adjusting rod (8) are higher than the core (2).

4. The hydrogen fuel cell stack core stacking limiting device according to claim 3 is characterized in that: The bottoms of the fixing rod (7) and the adjusting rod (8) are both provided with positioning bosses (12), and the positioning bosses (12) are in contact with the inner side of the top end of the packaging body (1).

5. The hydrogen fuel cell stack core stack limiting device according to any one of claims 1 to 4, characterized in that: The first fixing frame (3) and the second fixing frame (4) are both provided with connecting holes (13), and the first fixing frame (3) is provided with a positioning hole (14).

6. The hydrogen fuel cell stack core stacking limiting device according to claim 5, characterized in that: The first fixing frame (3) and the second fixing frame (4) are both provided with a protrusion (15).

7. The hydrogen fuel cell stack core stacking limiting device according to claim 6, characterized in that: The connection holes (13) are evenly distributed, and the positioning holes (14) are arranged in pairs.

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