Stacking and stacking integrated hydrogen fuel cell assembly process

Abstract

The invention relates to a stacking and stacking integrated hydrogen fuel cell assembly process. The process comprises the following steps: conveying a lower end plate, a bare stack assembly, an insulating pressure-bearing plate, an electric stack shell, a fastening bolt and an adjusting bolt which form a hydrogen fuel cell to an assembly station; the lower end plate, the bare stack assembly and the insulation bearing plate are accurately stacked together; the galvanic pile shell and the lower end plate are fixedly assembled together; compressing the bare stack assembly to a designed size and fixing the pre-tightening force of the bare stack assembly; and removing the lower pressure acting on the top surface of the insulating pressure-bearing plate so as to complete the stacking and stacking integrated hydrogen fuel cell assembly process. According to the invention, the assembly precision is improved, the long-term air tightness and the structural stability are enhanced, the assembly time and the process complexity are greatly reduced, the process flow is simplified, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to a hydrogen fuel cell assembly process, and specifically discloses a stacking and pressing integrated hydrogen fuel cell assembly process. Background Art

[0002] Hydrogen fuel cells are clean energy devices that directly convert the chemical energy of hydrogen and oxygen into electrical energy. They have significant advantages such as high energy density, zero emissions, and high efficiency. They are an important part of the future energy system and are widely used in transportation (such as fuel cell vehicles, drones, etc.), fixed power generation (such as distributed energy systems, backup power supplies, etc.) and portable devices (such as mobile power supplies, portable charging stations, etc.). In hydrogen fuel cells, the battery stack is the core component, and its performance directly affects the efficiency, life and reliability of the entire battery system.

[0003] A fuel cell stack is composed of multiple cells stacked and pressed together. Each cell usually contains key components such as a membrane electrode assembly (MEA), anode and cathode plates, and sealing gaskets. These components need to be assembled in a high-precision, tightly fitting manner to ensure air tightness, conductivity, and structural strength. However, the existing stack assembly process is mostly carried out in steps, that is, the stacking of the single cell components is completed first, and then the stack is pressed and fixed through an independent stacking process. This method has the following problems: 1. Risk of component misalignment; During the step-by-step assembly process, due to the lack of a unified positioning and guiding system, components are prone to misalignment during stacking and pressing, affecting assembly accuracy and stacking quality.

[0004] 2. The sealing performance is unstable; The sealing between the components in the fuel cell stack is crucial to the normal operation of the fuel cell. In the traditional assembly method, due to uneven pressure distribution or repeated positioning, it is easy to cause compression deformation of the sealing gasket or poor assembly, thus causing leakage problems.

[0005] 3. The process is complicated; The existing assembly process requires multiple manual or semi-automatic operations, and each link needs to be repeatedly adjusted and positioned, which not only increases the complexity of the process and time cost, but also easily leads to inconsistent assembly quality due to operational errors.

[0006] 4. Low production efficiency; The multi-step assembly process limits the degree of automation and continuity of the production line, making it difficult to meet the demands of industrial production for high efficiency and high output.

[0007] In summary, the existing fuel cell stack assembly process is still insufficient in terms of accuracy, efficiency and reliability, which has become an important bottleneck restricting the large-scale promotion of hydrogen fuel cells. Therefore, developing an efficient and integrated assembly process to achieve accurate assembly and efficient production of fuel cell stacks has important technical significance and application value. Summary of the invention

[0008] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a stack-pressing integrated hydrogen fuel cell assembly process that can achieve high-precision and high-efficiency assembly and significantly improve the quality and stability of the fuel cell stack.

[0009] According to the technical solution provided by the present invention, the stack-pressing integrated hydrogen fuel cell assembly process comprises the following steps: S1. The lower end plate, bare stack assembly, insulating pressure plate, stack shell, fastening bolts and adjusting bolts constituting the hydrogen fuel cell are transported to the assembly station. A lower end plate fastening bolt hole matching with the fastening bolt is opened on the lower end plate, a stack shell fastening bolt hole matching with the fastening bolt is opened on the stack shell, a stack shell adjusting bolt hole matching with the adjusting bolt is opened on the top plate of the stack shell, and a clamping hole is provided on the top plate of the stack shell; S2, accurately stacking the lower end plate, the bare stack assembly and the insulating pressure-bearing plate together, with the bare stack assembly stacked on top of the lower end plate, and the insulating pressure-bearing plate stacked on top of the bare stack assembly; S3, the stack shell slowly descends until the bottom surface of the stack shell contacts the top surface of the lower end plate, and the stack shell and the lower end plate are fixedly assembled together by screwing fastening bolts into the fastening bolt holes of the stack shell and the fastening bolt holes of the lower end plate; S4, passing through the compression hole on the top plate of the stack shell and applying uniform downward pressure on the top surface of the insulating pressure plate to compress the bare stack assembly to the designed size, and then screwing the adjusting bolt into the stack shell adjusting bolt hole of the stack shell, with the lower end of the adjusting bolt resting on the top surface of the insulating pressure plate to fix the preload force of the bare stack assembly; S5. Remove the downward pressure on the top surface of the insulating pressure plate to complete the stacking and pressing integrated hydrogen fuel cell assembly process to obtain a hydrogen fuel cell.

[0010] Preferably, a stacking guide device is further included, and in step S2, the stacking guide device is used to accurately stack the lower end plate, the bare stack assembly and the insulating pressure plate together; The stacking guide device comprises a mounting plate, a stacking platform base, a stacking platform, an inner guide column base, an inner guide column and an outer guide column; the stacking platform base, the inner guide column base and the outer positioning tool are all fixed on the upper surface of the mounting plate, the stacking platform is integrally fixed on the top of the stacking platform base, the length and width of the stacking platform are larger than the length and width of the stacking platform base, there are two inner guide column bases, one inner guide column is fixed on each inner guide column base, the inner guide column passes through the stacking platform from bottom to top, and the two inner guide columns are fool-proof, and a plurality of outer guide columns surround the stacking platform base; Two lower end plate inner guide holes are pre-opened on the lower end plate, two bare pile assembly inner guide holes are pre-opened on the bare pile assembly, and two insulating pressure plate inner guide holes are pre-opened on the insulating pressure plate. The lower end plate inner guide holes, the bare pile assembly inner guide holes, and the insulating pressure plate inner guide holes are all matched with the inner guide posts; During specific stacking, the lower end plate is placed on the stacking platform under the guidance of the guide holes in the lower end plate, the inner guide columns, and the outer guide columns; the bare stack assembly is stacked on the lower end plate under the guidance of the guide holes in the bare stack assembly, the inner guide columns, and the outer guide columns; the insulating pressure plate is placed on the bare stack assembly under the guidance of the guide holes in the insulating pressure plate, the inner guide columns, and the outer guide columns; thereby, the lower end plate, the bare stack assembly, and the insulating pressure plate are accurately stacked together.

[0011] Preferably, it also includes a stack shell clamping device, which is located above the stacking guide device. In step S3, the stack shell clamping device clamps the stack shell and drives it downward until the bottom surface of the stack shell contacts the top surface of the lower end plate, and the stack shell and the lower end plate are fixed together by screwing fastening bolts into the stack shell fastening bolt holes of the stack shell and the lower end plate fastening bolt holes of the lower end plate.

[0012] Preferably, a stacking device is further included, the stacking device is located above the stacking guide device, and the stacking device is used to perform stacking in step S4, wherein the stacking device includes a hydraulic system and a pressing head driven by the hydraulic system; During stacking, the pressure head passes through the clamping hole on the top plate of the stack shell and applies uniform downward pressure on the top surface of the insulating pressure plate to compress the bare stack assembly to the designed size. The bare stack assembly is assembled by tightening the adjusting bolts in the adjusting bolt holes on the top plate of the stack shell to a predetermined torque value to fix the preload force of the bare stack assembly.

[0013] Preferably, the inner guide post is used to limit the vertical displacement of the bare stack assembly, and the positioning accuracy can reach ±0.01mm.

[0014] Preferably, the torque value range of the adjusting bolt is 2-4 N·m.

[0015] Preferably, the pressure range of the hydraulic system is 0.5-1 MPa.

[0016] The present invention improves assembly accuracy, enhances long-term air tightness and structural stability, greatly reduces assembly time and process complexity, simplifies the process flow, and improves production efficiency.

[0017] The present invention provides a reliable solution for large-scale, high-precision and high-efficiency assembly of hydrogen fuel cell stacks, and has broad market application prospects, especially in the fields of transportation, electric power and portable power sources, and can significantly promote the industrialization development and popularization of hydrogen fuel cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a structure in which stacking is completed by using a stacking guide device.

[0019] Figure 2 It is a structural schematic diagram of the battery stack shell clamping device and the stack pressing device in the present invention.

[0020] Figure 3 It is a schematic diagram of the structure when the stack shell is about to descend.

[0021] Figure 4 It is a schematic diagram of the structure during compression.

[0022] Figure 5 It is a schematic diagram of the structure of a hydrogen fuel cell. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] A stack-pressing integrated hydrogen fuel cell assembly process, the process comprising the following steps: S1. The lower end plate 11, bare stack assembly 12, insulating pressure plate 13, stack shell 14, fastening bolts 15 and adjusting bolts 16 constituting the hydrogen fuel cell are transported to the assembly station by manual, semi-automatic or fully automatic transporting methods. A lower end plate fastening bolt hole matching with the fastening bolt 15 is provided on the lower end plate 11, a stack shell fastening bolt hole matching with the fastening bolt 15 is provided on the stack shell 14, a stack shell adjusting bolt hole matching with the adjusting bolt 16 is provided on the top plate of the stack shell 14, and a clamping hole 14.1 is provided on the top plate of the stack shell 14; S2, accurately stacking the lower end plate 11, the bare stack assembly 12 and the insulating pressure bearing plate 13 together, with the bare stack assembly 12 stacked on top of the lower end plate 11, and the insulating pressure bearing plate 13 stacked on top of the bare stack assembly 12, ensuring that each layer of the bare stack assembly 12 fits tightly and does not misalign; S3, the stack housing 14 slowly descends so that the bottom surface of the stack housing 14 contacts the top surface of the lower end plate 11, and the stack housing 14 and the lower end plate 11 are fixedly assembled together by screwing the fastening bolts 15 into the fastening bolt holes of the stack housing 14 and the lower end plate 11; S4, passing through the compression hole 14.1 on the top plate of the stack shell 14 and applying uniform downward pressure on the top surface of the insulating pressure plate 13, compressing the bare stack assembly 12 to the designed size, and then screwing the adjusting bolt 16 into the stack shell adjusting bolt hole of the stack shell 14, with the lower end of the adjusting bolt 16 resting on the top surface of the insulating pressure plate 13 to fix the preload force of the bare stack assembly 12; S5. Remove the downward pressure on the top surface of the insulating pressure plate 13. The stack shell 14 and the adjusting bolts 16 can apply continuous mechanical fixing force to the bare stack assembly 12 to ensure the long-term structural stability of the bare stack assembly 12, thereby completing the stack-compression integrated hydrogen fuel cell assembly process to obtain a hydrogen fuel cell.

[0025] It also includes a stacking guide device 1, and in step S2, the stacking guide device 1 is used to accurately stack the lower end plate 11, the bare stack assembly 12 and the insulating pressure-bearing plate 13 together; The stacking guide device 1 comprises a mounting plate 1.1, a stacking platform base 1.2, a stacking platform 1.3, an inner guide column base 1.4, an inner guide column 1.5 and an outer guide column 1.6; the stacking platform base 1.2, the inner guide column base 1.4 and the outer positioning tool 1.6 are all fixed on the upper surface of the mounting plate 1.1, the stacking platform 1.3 is integrally fixed on the top of the stacking platform base 1.2, the length and width of the stacking platform 1.3 are larger than the length and width of the stacking platform base 1.2, there are two inner guide column bases 1.4, and an inner guide column 1.5 is fixed on each inner guide column base 1.4, the inner guide column 1.5 passes through the stacking platform 1.3 from bottom to top, and the two inner guide columns 1.5 are fool-proof, and a plurality of outer guide columns 1.6 surround the stacking platform base 1.2; Two lower end plate inner guide holes are pre-opened on the lower end plate 11, two bare pile assembly inner guide holes are pre-opened on the bare pile assembly 12, and two insulating pressure bearing plate inner guide holes are pre-opened on the insulating pressure bearing plate 13. The lower end plate inner guide holes, the bare pile assembly inner guide holes and the insulating pressure bearing plate inner guide holes are all matched with the inner guide pillars 1.5; During specific stacking, the lower end plate 11 is placed on the stacking platform 1.3 under the guidance of the guide holes in the lower end plate, the inner guide pillars 1.5 and the outer guide pillars 1.6, the bare stack assembly 12 is stacked on the lower end plate 11 under the guidance of the guide holes in the bare stack assembly, the inner guide pillars 1.5 and the outer guide pillars 1.6, and the insulating pressure plate 13 is placed on the bare stack assembly 12 under the guidance of the guide holes in the insulating pressure plate, the inner guide pillars 1.5 and the outer guide pillars 1.6, thereby accurately stacking the lower end plate 11, the bare stack assembly 12 and the insulating pressure plate 13 together, as shown in FIG. Figure 1 shown.

[0026] Also includes a stack housing clamping device 2 (such as Figure 2 As shown), the stack housing clamping device 2 is located above the stacking guide device 1, as shown Figure 3 As shown, the stack shell clamping device 2 clamps the stack shell 14 and drives it downward until the bottom surface of the stack shell 14 contacts the top surface of the lower end plate 11, and the stack shell 14 and the lower end plate 11 are fixedly assembled together by screwing the fastening bolts 15 into the stack shell fastening bolt holes of the stack shell 14 and the lower end plate fastening bolt holes of the lower end plate 11.

[0027] It also includes a stacking device 3, such as Figure 2 As shown, the stacking device 3 is located above the stacking guide device 1. In step S4, the stacking device 3 is used to perform stacking. The stacking device 3 includes a hydraulic system 3.1 and a pressing head 3.2 driven by the hydraulic system 3.1. When compressing the pile, Figure 4 As shown, the pressure head 3.2 passes through the compression hole 14.1 on the top plate of the stack shell 14 and applies a uniform downward pressure on the top surface of the insulating pressure plate 13 to compress the bare stack assembly 12 to the designed size, and the bare stack assembly 12 is assembled by tightening the adjustment bolt 15 in the adjustment bolt hole on the top plate of the stack shell 14 to a predetermined torque value to fix the pre-tightening force of the bare stack assembly 12, thereby obtaining a hydrogen fuel cell, such as Figure 5 shown.

[0028] The inner guide column 1.5 is used to limit the vertical displacement of the bare stack assembly 12, and the positioning accuracy can reach ±0.01mm.

[0029] The torque value range of the adjusting bolt 16 is 2-4 N·m.

[0030] The pressure range of the hydraulic system 3.1 is 0.5-1 MPa.

[0031] Through the above-mentioned stacking and pressing integrated hydrogen fuel cell assembly process, the present invention achieves the following technical effects: 1. The present invention adopts a high-precision stacking guide device 1 to ensure that the bare stack assembly 12 remains accurately aligned during the entire assembly process, significantly reducing the risk of misalignment and stacking errors of the bare stack assembly 12 and improving assembly accuracy.

[0032] 2. The present invention adopts a stacking device 3 with uniform downward pressure distribution, which effectively improves the compression uniformity of the bare stack assembly 12 and enhances the long-term air tightness and structural stability of the bare stack assembly 12.

[0033] 3. The present invention organically integrates the stacking step of step S2 and the pressing step of step S4, avoiding multiple repeated positioning operations in the traditional process, greatly reducing the assembly time and process complexity, simplifying the process flow, and improving production efficiency.

[0034] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A stack-pressing integrated hydrogen fuel cell assembly process, characterized in that The process includes the following steps: S1. The lower end plate (11), the bare stack assembly (12), the insulating pressure-bearing plate (13), the stack shell (14), the fastening bolts (15) and the adjusting bolts (16) constituting the hydrogen fuel cell are transported to an assembly station, a lower end plate fastening bolt hole matching the fastening bolt (15) is opened on the lower end plate (11), a stack shell fastening bolt hole matching the fastening bolt (15) is opened on the stack shell (14), a stack shell adjusting bolt hole matching the adjusting bolt (16) is opened on the top plate of the stack shell (14), and a clamping hole (14.1) is provided on the top plate of the stack shell (14); S2, accurately stacking the lower end plate (11), the bare stack assembly (12) and the insulating pressure-bearing plate (13) together, with the bare stack assembly (12) stacked on top of the lower end plate (11), and the insulating pressure-bearing plate (13) stacked on top of the bare stack assembly (12); S3, the stack housing (14) slowly descends until the bottom surface of the stack housing (14) contacts the top surface of the lower end plate (11), and the stack housing (14) and the lower end plate (11) are fixedly assembled together by screwing fastening bolts (15) into the stack housing fastening bolt holes of the stack housing (14) and the lower end plate fastening bolt holes of the lower end plate (11); S4, passing through the compression hole (14.1) on the top plate of the stack shell (14) and applying uniform downward pressure on the top surface of the insulating pressure plate (13), compressing the bare stack assembly (12) to the designed size, and then screwing the adjusting bolt (16) into the stack shell adjusting bolt hole of the stack shell (14), with the lower end of the adjusting bolt (16) abutting against the top surface of the insulating pressure plate (13) to fix the pre-tightening force of the bare stack assembly (12); S5. Removing the downward pressure acting on the top surface of the insulating pressure-bearing plate (13), completing the stacking and pressing integrated hydrogen fuel cell assembly process, and obtaining a hydrogen fuel cell.

2. The stack-press-stack integrated hydrogen fuel cell assembly process according to claim 1, characterized in that: Also includes A stacking guide device (1), in step S2, the stacking guide device (1) is used to accurately stack the lower end plate (11), the bare stack assembly (12) and the insulating pressure-bearing plate (13) together; The stacking guide device (1) comprises a mounting plate (1.1), a stacking platform base (1.2), a stacking platform (1.3), an inner guide column base (1.4), an inner guide column (1.5) and an outer guide column (1.6); the stacking platform base (1.2), the inner guide column base (1.4) and the outer positioning tool (1.6) are all fixed on the upper surface of the mounting plate (1.1); the stacking platform (1.3) is integrally fixed on the top of the stacking platform base (1.2); the length and width of the stacking platform (1.3) are greater than the length and width of the stacking platform base (1.2); there are two inner guide column bases (1.4); an inner guide column (1.5) is fixed on each inner guide column base (1.4); the inner guide column (1.5) penetrates the stacking platform (1.3) from bottom to top, and the two inner guide columns (1.5) are arranged to prevent fooling; a plurality of outer guide columns (1.6) surround the stacking platform base (1.2); Two lower end plate inner guide holes are pre-opened on the lower end plate (11), two bare pile assembly inner guide holes are pre-opened on the bare pile assembly (12), and two insulating pressure plate inner guide holes are pre-opened on the insulating pressure plate (13), and the lower end plate inner guide holes, the bare pile assembly inner guide holes, and the insulating pressure plate inner guide holes all cooperate with the inner guide pillars (1.5); During stacking, the lower end plate (11) is placed on the stacking platform (1.3) under the guidance of the guide holes in the lower end plate and the inner guide columns (1.5) and the outer guide columns (1.6); the bare stack assembly (12) is stacked on the lower end plate (11) under the guidance of the guide holes in the bare stack assembly and the inner guide columns (1.5) and the outer guide columns (1.6); the insulating pressure plate (13) is placed on the bare stack assembly (12) under the guidance of the guide holes in the insulating pressure plate and the inner guide columns (1.5) and the outer guide columns (1.6); thereby, the lower end plate (11), the bare stack assembly (12) and the insulating pressure plate (13) are accurately stacked together.

3. The stack-and-press-integrated hydrogen fuel cell assembly process according to claim 2, characterized in that: The stack housing also includes a stack housing clamping device (2), which is located above the stacking guide device (1). In step S3, the stack housing clamping device (2) clamps the stack housing (14) and drives it downward until the bottom surface of the stack housing (14) contacts the top surface of the lower end plate (11), and the stack housing (14) and the lower end plate (11) are fixedly assembled together by screwing fastening bolts (15) into the stack housing fastening bolt holes of the stack housing (14) and the lower end plate fastening bolt holes of the lower end plate (11).

4. The stack-press-stack integrated hydrogen fuel cell assembly process as claimed in claim 3, characterized in that: It also includes a stacking device (3), the stacking device (3) is located above the stacking guide device (1), and in step S4, the stacking device (3) is used to perform stacking, the stacking device (3) comprising a hydraulic system (3.1) and a pressure head (3.2) driven by the hydraulic system (3.1); During stack pressing, the pressing head (3.2) passes through the pressing hole (14.1) on the top plate of the stack shell (14) and applies uniform downward pressure on the top surface of the insulating pressure-bearing plate (13), compressing the bare stack assembly (12) to a designed size, and assembling the bare stack assembly (12) by tightening the adjusting bolt (15) in the adjusting bolt hole on the top plate of the stack shell (14) to a predetermined torque value, thereby fixing the preload force of the bare stack assembly (12).

5. The stack-press-stack integrated hydrogen fuel cell assembly process as claimed in claim 2, characterized in that: The inner guide column (1.5) is used to limit the vertical displacement of the bare stack assembly (12), and the positioning accuracy can reach ±0.01 mm.

6. The stack-press-stack integrated hydrogen fuel cell assembly process according to claim 1 or 4, characterized in that: The torque value range of the adjusting bolt (16) is 2-4 N·m.

7. The stack-press-stack integrated hydrogen fuel cell assembly process as claimed in claim 4, characterized in that: The pressure range of the hydraulic system (3.1) is 0.5-1 MPa.

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