Efficient assembly tool for integrally packaging galvanic pile
By combining a tooling base plate, a housing fixing bracket, an outer positioning column, and an inner positioning rod, the problems of housing sealing failure and high cost in traditional fuel cell stack assembly are solved, achieving efficient and simple fuel cell stack assembly and improving the stability and sealing of the housing.
Patent Information
- Application Number
- CN202520273440.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-02-20
AI Technical Summary
Traditional fuel cell stack assembly processes suffer from high risk of casing seal failure, complex processes, and high costs, especially when using integrated casing packaging, where the requirements for processing accuracy and matching accuracy are too high.
The assembly process adopts a combination structure of tooling base plate, shell fixing bracket, tooling external positioning column, press plate and internal positioning rod. Through multiple positioning and limiting designs, it ensures that the initial position of the stack shell is accurately fixed and the core is vertically aligned, simplifying the assembly process.
This reduces the installation difficulty of the integrated packaged fuel cell stack, reduces the number and size of parts, saves costs, and improves the integrity and sealing of the casing.
Smart Images
Figure CN223842900U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fuel cell technology, and in particular to an assembly tooling for a high-efficiency integrated packaged fuel cell stack. Background Technology
[0002] Hydrogen fuel cells, as hydrogen energy conversion devices, are power generation devices that directly convert the chemical energy in fuel into electrical energy through electrochemical reactions. Using hydrogen as fuel, they offer advantages such as high efficiency and environmental friendliness, and have received widespread attention and application in the fuel cell field. The fuel cell stack is the core component of a hydrogen fuel cell, and its performance directly affects the efficiency and reliability of the entire fuel cell system.
[0003] Traditional fuel cell stacks typically employ a bare stack structure during assembly, meaning they lack a casing and are secured using fasteners such as screws, tie rods, or steel strips. For such stacks, the assembly usually involves stacking internal positioning rods and securing them with external positioning rods. During stack compression, the external positioning rods effectively prevent the core from collapsing or twisting, ensuring the stack's stability and performance. However, this method is unsuitable for using an outer casing instead of screws, tie rods, or steel strips for securing the stack. Figure 2 As shown, the fuel cell stack body 1 is composed of a core body 24, a fuel cell stack shell 25 disposed outside the core body 24, a front current collector 23, a front insulation plate 22 and a front end plate 21 disposed sequentially at the bottom of the core body 24, and a rear current collector 26, a rear insulation plate 27, a disc spring pressure plate 28 and an adjustment plate 6 disposed sequentially at the top of the core body 24.
[0004] With the continuous development of fuel cell technology, integrated shell packaging technology has gradually become the mainstream trend. There are two main types of integrated shell packaging technology: one involves dividing the shell into two halves and using traditional internal and external positioning posts. After the fuel cell stack is pressed into the predetermined position, the external positioning post is removed, and the two halves of the shell are then properly packaged. The second type uses a one-piece shell, employing a horizontal press-fit method, where the fuel cell core is fed into the shell in batches through multiple transition tooling. While the first type of shell packaging technology is mature, it increases the risk of shell seal failure. The second type of shell packaging technology is complex, too costly, and requires very high precision in the machining and matching of the tooling and the shell. Summary of the Invention
[0005] This invention overcomes the shortcomings of the prior art and provides a highly efficient integrated packaged fuel cell stack assembly tooling, opening up a new assembly process. The shell does not need to be separated into two halves, and the tooling structure is also simple, greatly reducing the requirements for the processing and matching accuracy of the tooling and shell.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a high-efficiency integrated packaged fuel cell stack assembly fixture, comprising:
[0007] The tooling base plate is provided with fuel cell housing positioning holes and fuel cell housing limiting grooves, which are used to fix the initial position of the fuel cell housing by positioning pins;
[0008] The housing fixing brackets are symmetrically arranged on the top of the tooling base plate and are used to fix the fuel cell stack housing to the tooling base plate by bolts;
[0009] The tooling external positioning posts include a tooling left positioning post, a tooling front positioning post, a tooling right positioning post, and a tooling rear positioning post, which are respectively vertically fixed to the front, rear, left, and right edges of the tooling base plate;
[0010] The press plate, connected to the rear end plate of the fuel cell stack body via a press column, is used to press the core body downward into the fuel cell stack shell;
[0011] An inner positioning rod extends through the front end plate, the core body, and the rear end plate to maintain the vertical alignment of the core body during stacking.
[0012] In a preferred embodiment of this utility model, the upper limiting boss is fixed to the top of the outer positioning post of the tooling and cooperates with the housing positioning post limiting hole of the fuel cell stack housing, so that the contact limiting surface and the core limiting surface are on the same plane.
[0013] In a preferred embodiment of this utility model, the bottom end of the outer positioning column of the tooling is engaged with the T-shaped nut mounting hole on the base plate of the tooling through a waist-shaped hole, and is fastened by bolts.
[0014] In a preferred embodiment of this utility model, the tooling external positioning column is aligned with the threaded hole on the mating surface of the fuel cell rear end plate through the upper fixed mounting hole and fixed by bolts, which is used to limit the lateral movement of the fuel cell core body during the pressing process.
[0015] In a preferred embodiment of this utility model, an adjustable T-nut is provided in the T-nut mounting hole on the tooling base plate to adapt to the tooling external positioning column of different sizes.
[0016] In a preferred embodiment of this utility model, a plurality of lower positioning bosses are fixed at the bottom of the tooling external positioning post, and the lower positioning bosses are engaged with the top of the tooling base plate to realize the positioning of the tooling external positioning post on the top of the tooling base plate.
[0017] This utility model solves the defects existing in the background technology, and has the following beneficial effects:
[0018] (1) This utility model provides an efficient assembly tooling for an integrated packaged fuel cell stack. Through the cooperation of the tooling base plate, the housing fixing bracket, the tooling outer positioning column, the press plate and the inner positioning rod with the fuel cell stack body, compared with the tooling structure of the traditional integrated packaged fuel cell stack, this assembly tooling can reduce the installation difficulty of the integrated packaged fuel cell stack, and the structure is simpler, the housing integration is higher, and the number of parts, volume and weight are reduced, thereby saving installation costs and material costs, while ensuring the integrity, strength and sealing of the housing. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments;
[0020] Figure 1 This is an exploded three-dimensional view of the assembly fixture for the integrated packaged fuel cell stack in this utility model.
[0021] Figure 2 This is an exploded three-dimensional view of the integrated packaged fuel cell stack body in this utility model;
[0022] Figure 3 This is a top view of the internal limiting position of the integrated packaged fuel cell stack in this utility model;
[0023] Figure 4 This is a schematic diagram of the integrated packaged fuel cell stack after press-fitting in this utility model;
[0024] Figure 5 This utility model Figure 4 Enlarged structural diagram at point A in the middle;
[0025] Figure 6 This utility model Figure 4 Enlarged structural diagram at point B;
[0026] In the diagram: 1. Fuel cell stack body; 2. Left positioning post of the tooling; 3. Front positioning post of the tooling; 4. Rear end plate; 5. Pressure post; 6. Adjusting plate; 7. Right positioning post of the tooling; 8. Rear positioning post of the tooling; 9. Housing fixing bracket; 10. Tooling base plate; 11. Inner positioning rod; 12. Press pressure plate; 13. Fuel cell stack housing positioning hole; 14. Fuel cell stack housing limiting groove; 15. Upper limiting boss; 16. Contact limiting surface; 21. Front end plate; 22. Front insulation plate; 23. Front current collector plate; 24. Core body; 25. Fuel cell stack housing; 26. Rear current collector plate; 27. Rear insulation plate; 28. Disc spring pressure plate; 31. Housing positioning post limiting hole; 32. Fuel cell stack rear end plate mating surface; 33. Core limiting surface; 40. T-nut mounting hole; 41. Lower positioning boss; 42. Upper fixing mounting hole. Detailed Implementation
[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.
[0028] like Figure 1-6 As shown, a high-efficiency integrated packaged fuel cell stack assembly fixture includes: a fixture base plate 10, which has fuel cell housing positioning holes 13 and fuel cell housing limiting grooves 14 for fixing the initial position of the fuel cell housing 25 by positioning pins; a housing fixing bracket 9, symmetrically arranged on the top of the fixture base plate 10, for fixing the fuel cell housing 25 to the fixture base plate 10 by bolts; external positioning posts of the fixture, including a left positioning post 2, a front positioning post 3, a right positioning post 7 and a rear positioning post 8, which are respectively vertically fixed to the front, rear and left and right edges of the fixture base plate 10; a press plate 12, which is connected to the rear end plate 4 of the fuel cell body 1 through the press post 5, for pressing the core body 24 downward into the fuel cell housing 25; and an inner positioning rod 11, which passes through the front end plate 21, the core body 24 and the rear end plate 4, for maintaining the vertical alignment of the core body 24 during the stacking process.
[0029] It should be noted that the multiple positioning of the stack housing 25 through the positioning holes 13, the limiting grooves 14, and the housing fixing brackets 9 ensures that the initial position of the stack housing 25 is accurately fixed. The surrounding structure of the tooling outer positioning post provides stable lateral limiting to prevent the stack housing 25 from shifting during the pressing process. Furthermore, the uniform pressure of the press plate 12 and the vertical alignment function of the inner positioning rod 11 combine to ensure the accurate pressing of the core body 24. At the same time, the through design of the inner positioning rod 11 simplifies the alignment process of the core body 24 and reduces the assembly difficulty.
[0030] In some embodiments, the upper limiting boss 15 is fixed to the top of the external positioning post of the tooling and cooperates with the housing positioning post limiting hole 31 of the fuel cell stack housing 25, so that the contact limiting surface 16 and the core limiting surface 33 are on the same plane. This helps to maintain the vertical alignment of the core body 24 during the pressing process and prevents it from tilting or shifting due to uneven force. At the same time, the upper limiting boss 15 can also provide additional support force and enhance the stability of the fuel cell stack housing 25.
[0031] In some embodiments, the bottom end of the tooling external positioning post engages with the T-shaped nut mounting hole 40 on the tooling base plate 10 through a waist-shaped hole and is fastened by bolts; this allows the tooling external positioning post to have a certain amount of adjustment space in the vertical direction to accommodate fuel cell stack housings 25 of different sizes.
[0032] In some embodiments, the external positioning post of the tooling is aligned with the threaded hole of the mating surface 32 of the rear end plate of the fuel cell stack through the upper fixed mounting hole 42 and fixed by bolts, which is used to limit the lateral movement of the core body 24 during the pressing process; it provides additional lateral limiting function when pressing the core body 24 to prevent the core body 24 from moving or deforming laterally during the pressing process. At the same time, it also enhances the stability and reliability of the overall structure of the fuel cell stack.
[0033] In some embodiments, the tooling base plate 10 has an adjustable T-nut in the T-nut mounting hole 40 to accommodate tooling external positioning posts of different sizes; the adjustable T-nut in the T-nut mounting hole 40 further enhances adaptability, enabling the tooling to adapt to more types of fuel cell stack housing 25 assembly requirements.
[0034] In some embodiments, the bottom of the external positioning post of the tooling is fixed with several lower positioning bosses 41, which are engaged with the top of the tooling base plate 10 to position the external positioning post on the top of the tooling base plate 10. This ensures the accuracy of the external positioning post's position during assembly and avoids assembly errors caused by positional deviations. Simultaneously, the lower positioning bosses 41 also provide additional support points, enhancing the overall stability of the tooling.
[0035] Example 1
[0036] The press-fitting process of the assembly tooling for the integrated packaged fuel cell stack: such as Figure 1 and Figure 2 As shown, the front end plate 21 is first connected to the fuel cell housing 25 with bolts. The front end plate 21 of the fuel cell housing 25 faces downward and stands on the tooling base plate 10. The connected fuel cell housing 25 is fixed in the fuel cell housing limiting groove 14 through the fuel cell housing positioning hole 13 on the tooling base plate 10 under the action of the positioning pin. At the same time, the fuel cell housing 25 is fixed to the tooling base plate 10 again through two housing fixing brackets 9 on both sides to ensure that the fuel cell housing 25 is always in a tight state during the pressing process. At the same time, the positioning pin and the fuel cell housing limiting groove 14 work together to restrict the displacement of the fuel cell body 1 during the pressing process.
[0037] After the housing fixing bracket 9 fixes the front end plate 21 and the fuel cell housing 25 (assembled) to the tooling base plate 10, under the action of the inner positioning rod 11, the front insulating plate 22, the front current collector plate 23, the core body 24, the rear current collector plate 26, the rear insulating plate 27, the disc spring pressure plate 28, and the adjusting plate 6 are stacked into the fuel cell housing 25 in sequence. The core body 24 is composed of alternating stacked bipolar plates and membrane electrodes. The length of the core body 24 depends on the number of bipolar plates and membrane electrodes, which is determined by the fuel cell power. After all parts are stacked, because the bipolar plates and membrane electrodes are in a compressed state, some parts will exceed the height of the fuel cell rear end plate contact surface 32 of the fuel cell housing 25. The tooling outer positioning post is needed to limit the displacement of these excess parts.
[0038] like Figure 1 As shown, the fuel cell stack housing 25 has external positioning posts in four directions: front, back, left, and right. These are divided into four parts: left positioning post 2, front positioning post 3, right positioning post 7, and rear positioning post 8. Figure 5 and Figure 6 As shown, the tooling external positioning post is tightly fitted to the tooling base plate 10. Both sides of the tooling external positioning post have waist-shaped holes that correspond to the T-shaped nut mounting holes 40 of the tooling base plate 10, and there is also a lower positioning boss 41. Each tooling external positioning post has at least four sets of bolt mounting holes. After the upper limiting boss 15 is engaged with the shell positioning post limiting hole 31, the upper fixing mounting hole 42 will be aligned with the threaded hole on the rear end plate contact surface 32 of the fuel cell stack. The tooling external positioning post and the rear end plate contact surface 32 of the fuel cell stack are fixed together by three sets of bolts. At the same time, the lower end is fastened to the T-shaped nut in the T-shaped nut mounting hole 40 on the tooling base plate 10 by four sets of bolts. This ensures that the contact limiting surface 16 and the core limiting surface 33 are on the same plane, which can ensure that a part of the fuel cell stack rear end plate contact surface 32 that extends beyond the fuel cell stack shell 25 will not be deformed or misaligned during the downward pressing process.
[0039] Depend on Figure 1 and Figure 5 As shown, the rear end plate 4 in the fuel cell stack body 1 is fixed together with the press plate 12 with bolts before the fuel cell stack is press-fitted. The pressure post 5 on the press plate 12 extends through the rear end plate 4 to a sufficient length to ensure that after the fuel cell stack body 1 is press-fitted, the rear end plate 4 does not interfere with the uppermost end face of the tooling left positioning post 2, tooling front positioning post 3, tooling right positioning post 7 and tooling rear positioning post 8 around the fuel cell stack housing 25. When the upper end face of the adjusting plate 6 is flush with the mating surface 32 of the fuel cell stack rear end plate, the predetermined press-fitting position is reached. At this time, the tooling outer positioning posts around the fuel cell stack housing 25 are removed, the fixing bolts between the rear end plate 4 and the press plate 12 are loosened, the lower end face of the rear end plate 4 is mated with the mating surface 32 of the fuel cell stack rear end plate, and the surrounding area is tightened with bolts. Then the press plate 12 is placed on the platform to complete the fuel cell stack press-fitting.
[0040] It should be noted that the assembly fixture of this integrated packaged fuel cell stack uses the upper limiting boss 15 and the lower positioning boss 41 between the outer positioning post of the fixture and the housing positioning post, and also utilizes multiple limiting and mounting holes on the fuel cell stack housing 25 and the fixture base plate 10 to ensure that the contact limiting surface 16 and the core limiting surface 33 are on the same plane. At the same time, a gap adjustment structure is designed on the housing positioning post, and with the assistance of the inner positioning rod 11, the installation gap between the core limiting surface 33 and the core body 24 is increased. This reduces the installation difficulty of the integrated packaged fuel cell stack, simplifies the fixture structure, reduces the machining accuracy of the fixture and housing, and saves installation and material costs.
[0041] Based on the above description and the preferred embodiments of this utility model, it will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A high-efficiency integrated packaged fuel cell stack assembly tooling, characterized in that, include: Tooling base plate (10), the tooling base plate (10) is provided with fuel cell housing positioning hole (13) and fuel cell housing limiting groove (14), which are used to fix the initial position of fuel cell housing (25) by positioning pin; The housing fixing bracket (9) is symmetrically arranged on the top of the tooling base plate (10) for fixing the fuel cell housing (25) to the tooling base plate (10) by bolts; The tooling external positioning posts include the tooling left positioning post (2), the tooling front positioning post (3), the tooling right positioning post (7) and the tooling rear positioning post (8), and are respectively vertically fixed to the front, rear and left and right edges of the tooling base plate (10); The press plate (12) is connected to the rear end plate (4) of the stack body (1) via the press column (5) and is used to press the core body (24) downward into the stack shell (25); An inner positioning rod (11) passes through the front end plate (21), the core body (24) and the rear end plate (4) to maintain the vertical alignment of the core body (24) during the stacking process.
2. The assembly fixture for a high-efficiency integrated packaged fuel cell stack according to claim 1, characterized in that: The upper limiting boss (15) is fixed to the top of the external positioning post of the tooling and cooperates with the housing positioning post limiting hole (31) of the fuel cell housing (25) so that the contact limiting surface (16) and the core limiting surface (33) are on the same plane.
3. The assembly fixture for a high-efficiency integrated packaged fuel cell stack according to claim 1, characterized in that: The bottom end of the tooling external positioning column is engaged with the T-shaped nut mounting hole (40) on the tooling base plate (10) through the waist-shaped hole and is fastened by bolts.
4. The assembly fixture for a high-efficiency integrated packaged fuel cell stack according to claim 1, characterized in that: The tooling external positioning column is aligned with the threaded hole of the rear end plate of the fuel cell stack through the upper fixed mounting hole (42) and fixed by bolts, and is used to limit the lateral movement of the fuel cell core body (24) during the pressing process.
5. The assembly fixture for a high-efficiency integrated packaged fuel cell stack according to claim 3, characterized in that: The tooling base plate (10) has an adjustable T-nut in the T-nut mounting hole (40) for adapting to the tooling external positioning column of different sizes.
6. The assembly fixture for a high-efficiency integrated packaged fuel cell stack according to claim 1, characterized in that: The bottom of the tooling external positioning post is fixed with several lower positioning bosses (41), which are engaged with the top of the tooling base plate (10) to realize the positioning of the tooling external positioning post on the top of the tooling base plate (10).