A multi-module fuel cell stack tooling and method of stacking

Abstract

This invention discloses a multi-module fuel cell stacking fixture and method, comprising a stacking body, multiple fixing components, and stacking modules. A connecting rod is provided between the upper and lower pressure blocks of the stacking body. The fixing components on the sidewall of the connecting rod divide the gap into multiple stacking sections. Each section contains a stacking module including a stacking base plate and fixing posts, with the fixing posts of adjacent modules extending in different directions. This invention, through modular disassembly and layered pressing design, supports the integrated stacking of multiple independent fuel cell stack modules, achieving high-efficiency and high-precision stacking of over 500 fuel cell stacks without increasing equipment configuration, significantly improving performance consistency and structural reliability. Simultaneously, it allows for targeted positioning and adjustment of PEM fuel cell stacks at different locations, reducing interlayer deviation and pressure unevenness, and enables synchronous airtightness testing, improving the overall stacking efficiency and reliability.

Description

Technical Field

[0001] This invention relates to the field of fuel cell equipment technology, and specifically to a multi-module fuel cell stacking fixture and stacking method. Background Technology

[0002] A fuel cell stack is a power generation device composed of multiple individual cells connected in series in a stacked manner. The assembly quality directly determines the output performance, sealing reliability, and service life of the stack. During the stack assembly process, a pre-tightening force needs to be applied to the stack through a press-fitting process to ensure that the contact resistance between the bipolar plates and the membrane electrode assembly is within a reasonable range, while ensuring that the sealing interfaces between each component reach the compression amount required by the design.

[0003] Currently, the most widely used fuel cell stack press-fitting methods in industry mainly include two categories: fixed-size press-fitting and fixed-pressure press-fitting. Regardless of the method used, the consistency and controllability of the press-fitting process are crucial to ensuring stack performance. For fuel cell stacks using a "screw-spring" structure, the clamping force is provided and maintained by a disc spring or helical spring that runs through the screw and engages with the outer side of the end plate. The compression state of the spring directly affects the force maintenance characteristics of the stack during operation. However, in actual press-fitting, due to the gap between the spring and the stud, the spring is prone to tilting under pressure, leading to uneven force distribution or even localized bulging, which in turn affects the press-fitting quality and long-term operational stability of the fuel cell stack.

[0004] To address the aforementioned issues, some improvements have been implemented in existing technologies. For example, by using a pressure head with a limiting structure to surround the spring, radial constraints are applied to the spring during press-fitting, preventing spring tilting and improving press-fitting consistency. This type of solution has good adaptability to the "screw-spring" structure of a single fuel cell stack and can effectively improve the stress state of the spring. However, the design of existing press-fitting tooling is usually designed for a single fuel cell stack structure. Its limiting structure and press-fitting method are closely related to the specific screw layout and spring size, and cannot be directly applied to the integrated press-fitting scenario of multi-module fuel cell stacks.

[0005] As fuel cells expand into high-power applications such as ships, heavy-duty trucks, and stationary power stations, the power output of a single stack is no longer sufficient, leading to increasing attention on modular integration technologies involving multiple stacks. Multi-module stack systems, by integrating multiple stack modules in series or parallel, can achieve higher power output within a limited space. However, the press-fitting process for multi-module structures faces new challenges: height tolerances between modules, coordinated pressing of multiple screw-spring units, and consistency of stress on each module after overall press-fitting all place higher demands on press-fitting tooling. Existing press-fitting solutions are mostly designed for single stacks, making it difficult to accommodate the synchronous press-fitting requirements of multi-module scenarios, and the mutual interference between modules during the press-fitting process has not yet been effectively resolved. Summary of the Invention

[0006] To address the common problems of interlayer alignment deviation, uneven pressure distribution, and contact resistance fluctuation in the stacking process of multi-cell fuel cell stacks in existing technologies, a multi-module fuel cell stacking tooling and stacking method are proposed. This method fundamentally solves the consistency problem of multi-cell fuel cell stacking and ensures that the performance and reliability of each cell after stacking meet the design standards.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: a multi-module fuel cell stacking fixture, including a stacking body, multiple fixing components, and multiple stacking modules; the stacking body includes an upper pressure block and a lower pressure block that are separately arranged vertically; a pneumatic device is provided on the surface of the upper pressure block facing the lower pressure block; multiple connecting rods are separately arranged between the upper pressure block and the lower pressure block; the two ends of the connecting rods are fixedly connected to the upper pressure block and the lower pressure block, respectively; a fixing component is fixed on the side wall of each connecting rod; the fixing component on the side wall of each connecting rod is arranged facing the interior of the stacking body; the multiple fixing components divide the gap between the upper pressure block and the lower pressure block into multiple stacking intervals that are connected vertically; a stacking module is correspondingly arranged in each stacking interval; the stacking module includes a stacking base plate and multiple fixing columns; the multiple fixing columns are vertically fixed on the stacking base plate; one end of the fixing column is fixedly connected to the stacking base plate; the other end of the fixing column is fixedly connected to the stacking base plate in another adjacent stacking module; the extension direction of the fixing column in the stacking interval does not coincide with the extension direction of the fixing column in the adjacent stacking module.

[0008] Furthermore, the stack body includes an upper pressure block and a lower pressure block that are set up separately; the upper pressure block is located directly above the lower pressure block, and both the upper and lower pressure blocks are rectangular structures that correspond to each other; a pneumatic device is provided on the surface of the upper pressure block near the lower pressure block; the pneumatic device can move up and down in the gap formed between the upper and lower pressure blocks; the pneumatic device is connected to an external gas source; and multiple through holes are provided on the surface of the pneumatic device that contacts the PEM stack.

[0009] Furthermore, four columnar connecting rods are provided between the upper and lower pressure blocks; the four connecting rods are set separately, and each connecting rod is fixedly connected at both ends to the lower surface of the upper pressure block and the upper surface of the lower pressure block, respectively; the four connecting rods are set perpendicular to the upper and lower pressure blocks, and the four connecting rods are set parallel to each other; a first fixing component, a second fixing component, a third fixing component, and a fourth fixing component with the same structure are fixed at intervals on the side wall of each connecting rod; the spacing between the first fixing component, the second fixing component, the third fixing component, and the fourth fixing component on the side wall of each connecting rod is equal.

[0010] Furthermore, the fixing component is equipped with a hinge; the fixing component is a foldable plate structure; the fixing component is folded via the hinge.

[0011] Furthermore, the first fixing components corresponding to the four separately arranged connecting rods are all located on the same horizontal plane and together form a first horizontal partition plate perpendicular to the connecting rods, with each of the four separately arranged connecting rods facing the center of the stacking body; the second fixing components corresponding to the four separately arranged connecting rods are all located on the same horizontal plane and together form a second horizontal partition plate perpendicular to the connecting rods, with each of the four separately arranged connecting rods facing the center of the stacking body; the third fixing components corresponding to the four separately arranged connecting rods are all located on the same horizontal plane and together form a third horizontal partition plate perpendicular to the connecting rods, with each of the four separately arranged connecting rods facing the center of the stacking body; the fourth fixing components corresponding to the four separately arranged connecting rods are all located on the same horizontal plane and together form a fourth horizontal partition plate perpendicular to the connecting rods, with each of the four separately arranged connecting rods facing the center of the stacking body; the area between the first and second horizontal partition plates is the first stacking interval, the area between the second and third horizontal partition plates is the second stacking interval, and the area between the third and fourth horizontal partition plates is the third stacking interval.

[0012] Furthermore, a first stacking module is provided in the first stacking interval, a second stacking module is provided in the second stacking interval, and a third stacking module is provided in the third stacking interval; the first stacking module includes a first stacking base plate and a plurality of first fixing posts; a plurality of first fixing posts are vertically fixed to the inner circumference of the first stacking base plate; the plurality of first fixing posts are located on the upper surface of the first stacking base plate and are arranged in the same direction; the other end of the first fixing posts is fixedly connected to the second stacking base plate of the second stacking module in the second stacking interval; the second stacking module includes a second stacking base plate and a plurality of second fixing posts; the second fixing posts are vertically fixed to the second stacking base plate and are arranged in a direction away from the extension direction of the first fixing posts; the plurality of second fixing posts are separated. And it is arranged along the inner periphery of the second stack base plate; the fixing position of the second fixing post on the second stack base plate is different from the opening position of the second mounting hole on the second stack base plate; the other end of the second fixing post is fixedly connected to the third stack base plate of the third stack module in the third stack interval; the third stack module includes the third stack base plate and multiple third fixing posts; the third fixing posts are vertically fixed on the third stack base plate and are arranged in a direction away from the extension direction of the second fixing posts; the multiple third fixing posts are separated and arranged along the inner periphery of the third stack base plate; the fixing position of the third fixing post on the third stack base plate is different from the opening position of the third mounting hole on the third stack base plate; the other end of the third fixing post is fixedly connected to the fourth stack base plate.

[0013] Furthermore, the second stack base plate has multiple second vent holes on its surface; the second stack base plate has second mounting holes on its surface; the fixing position of the second fixing post on the second stack base plate is different from the opening position of the second mounting hole on the second stack base plate; the third stack base plate has multiple third vent holes; the third stack base plate has third mounting holes on its surface; the fixing position of the third fixing post on the third stack base plate is different from the opening position of the third mounting hole on the third stack base plate; the fourth stack base plate has multiple fourth vent holes.

[0014] Furthermore, a positioning device is provided on the surface of the first stacking base plate; a positioning device is provided on the surface of the second stacking base plate; a positioning device is provided on the surface of the third stacking base plate; the positioning device on the stacking base plate is used to position the outer periphery of the PEM stack located in the corresponding stacking interval.

[0015] Furthermore, a fuel cell stacking method using a multi-module fuel cell stacking fixture includes the following steps: Step 1: Place a PEM stack on the stacking base plate of the stacking module closest to the lower pressure block and arrange multiple fixing posts around the inner circumference of the stacking base plate; install an additional stacking base plate at the other end of the multiple fixing posts and fix the other end of the multiple fixing posts to the stacking base plate; Step 2: Drive the pneumatic device on the upper pressure block to move down and contact the additionally installed stacking base plate to press and position the PEM stack; vertically install multiple fixing posts on the other side of the additionally installed stacking base plate; the extension directions of the fixing posts on both sides of the stacking base plate do not coincide with each other; Step 3: Place another PEM stack on the surface of the additionally installed stacking base plate; fix another stacking base plate at the other end of the fixing posts on the surface of the additionally installed stacking base plate; Step 4: Drive the pneumatic device on the upper pressure block to move down and contact the re-fixed stacking base plate to press and position the other PEM stack; complete the stacking of multiple PEM stacks.

[0016] Furthermore, each additional fixed stack base plate has ventilation holes on its surface, and the pneumatic device has multiple through holes and is connected to an external air source; the pneumatic device is connected to the stacked PEM stack through a gas channel.

[0017] This invention discloses a multi-module fuel cell stacking fixture and method. Through an innovative design of modular disassembly and layered pressing, it supports the integrated stacking of multiple independent fuel cell stack modules. Without increasing the hardware requirements, it effectively achieves efficient and high-precision stacking of over 500 fuel cell stacks, significantly improving the performance consistency and structural reliability of large fuel cell stacks. Compared to integrated stacking fixtures, it enables targeted positioning and adjustment of PEM stacks at different locations, effectively controlling positioning accuracy during stacking and reducing problems such as interlayer alignment deviations, uneven pressure distribution, and excessive performance parameter fluctuations. Based on the accurate and stable positioning of multiple PEM stacks, it also enables synchronous airtightness detection during stacking, greatly improving the overall efficiency of fuel cell stacking, especially the performance and reliability after stacking. It provides an assembly solution suitable for multi-cell fuel cells. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a multi-module fuel cell stacking fixture according to the present invention; Figure 2 This is a schematic diagram of the assembly of multiple stacked modules of a multi-module fuel cell stacking fixture according to the present invention. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1 and 2 As shown, the multi-module fuel cell stacking fixture of the present invention includes a stacking body 1, multiple fixing components 2, and multiple stacking modules; The stacking body 1 includes an upper pressing block 10 and a lower pressing block 13 that are arranged separately at the top and bottom; a pneumatic device 11 is provided on the surface of the upper pressing block 10 facing the lower pressing block 13; a plurality of connecting rods 12 are arranged separately between the upper pressing block 10 and the lower pressing block 13; the two ends of the connecting rods 12 are fixedly connected to the upper pressing block 10 and the lower pressing block 13 respectively. Each of the connecting rods 12 has a fixing component 2 fixed on its side wall; the fixing component 2 on the side wall of each connecting rod 12 is arranged facing the interior of the stacking body 1; the multiple fixing components 2 divide the gap between the upper pressure block 10 and the lower pressure block 13 into multiple stacking sections connected vertically. Each stacking interval is provided with a corresponding stacking module; the stacking module includes a stacking base plate and multiple fixing columns; the multiple fixing columns are vertically fixed on the stacking base plate; one end of the fixing column is fixedly connected to the stacking base plate; the other end of the fixing column is fixedly connected to the stacking base plate of another adjacent stacking module; the extension direction of the fixing column in the stacking interval does not coincide with the extension direction of the fixing column in the adjacent stacking module.

[0022] exist Figure 1 The stacking body 1 includes an upper pressing block 10 and a lower pressing block 13 arranged separately. The upper pressing block 10 is located directly above the lower pressing block 13. Both the upper pressing block 10 and the lower pressing block 13 are rectangular structures and their structures correspond to each other. A pneumatic device 11 is provided on the lower surface of the upper pressing block 10, i.e., the surface near the lower pressing block 13. The pneumatic device 11 can move up and down in the gap formed between the upper pressing block 10 and the lower pressing block 13. The pneumatic device 11 is connected to an external gas source. Specifically, the pneumatic device 11 moves up and down on the upper pressing block 10 and the lower pressing block 13 under the action of gas. The lower pressure blocks 13 move up and down to press and stack PEM stacks at different positions. The pneumatic device 11, which is used for pressing and pressing and contacts the PEM stack, has multiple through holes on its surface. The pneumatic device 11 communicates with the PEM stacks at different positions through the multiple through holes. When the pneumatic device 11 moves under the action of gas, the gas in the pneumatic device 11 enters the PEM stack through the multiple through holes on its surface, thereby realizing the synchronous testing of the airtightness performance of the PEM stack during the stacking process. This improves the multifunctionality of the device and the assembly efficiency of the PEM stack.

[0023] Four columnar connecting rods 12 are provided between the upper pressure block 10 and the lower pressure block 13. The four connecting rods 12 are arranged separately, and each end of the connecting rod 12 is fixedly connected to the lower surface of the upper pressure block 10 and the upper surface of the lower pressure block 13, respectively. The four connecting rods 12 are respectively located near the apex of the upper pressure block 10 or the apex of the lower pressure block 13. The upper pressure block 10 and the lower pressure block 13 are fixedly connected by the four connecting rods 12. Specifically, the four connecting rods 12 are all perpendicular to the upper pressure block 10 and the lower pressure block 13, and the four connecting rods 12 are parallel to each other.

[0024] Each connecting rod 12 has multiple fixing components 2 vertically fixed to its side wall; specifically, each connecting rod 12 has a first fixing component 21, a second fixing component 22, a third fixing component 23, and a fourth fixing component 24 with identical structures fixed at intervals on its side wall; the spacing between the first fixing components 21, second fixing components 22, third fixing components 23, and fourth fixing components 24 on the side wall of each connecting rod 12 is equal to that between them; the first fixing components 21 corresponding to the four separately arranged connecting rods 12 are all located on the same horizontal plane and together form a first horizontal partition plate perpendicular to the connecting rods 12, and the first fixing components 21 corresponding to the four separately arranged connecting rods 12 are all arranged towards the center of the stacked body 1; the second fixing components 22 corresponding to the four separately arranged connecting rods 12 are all located on the same horizontal plane and together form a second horizontal partition plate perpendicular to the connecting rods 12. The second fixing components 22 corresponding to the four separately arranged connecting rods 12 are all arranged towards the center of the stacked main body 1; the third fixing components 23 corresponding to the four separately arranged connecting rods 12 are all located on the same horizontal plane and together form a third flat partition plate perpendicular to the connecting rods 12, and the third fixing components 23 corresponding to the four separately arranged connecting rods 12 are all arranged towards the center of the stacked main body 1; the first fixing components 21 corresponding to the four separately arranged connecting rods 12 are all located on the same horizontal plane and together form a fourth horizontal partition plate perpendicular to the connecting rods 12, and the fourth fixing components 24 corresponding to the four separately arranged connecting rods 12 are all arranged towards the center of the stacked main body 1; more preferably, the fixing component 2 is provided with a hinge; the fixing component 2 is a foldable plate structure; through the hinge therein, the folding of the fixing component is realized, thereby improving the disassembly efficiency of the component.

[0025] The first, second, third, and fourth horizontal partitions divide the gap between the upper pressure block 10 and the lower pressure block 13 into three stacking sections. Specifically, the area between the first and second horizontal partitions is the first stacking section, the area between the second and third horizontal partitions is the second stacking section, the area between the third and fourth horizontal partitions is the third stacking section, and the area between the fourth horizontal partition and the upper pressure block 10 is used for the vertical movement of the pneumatic device 11. A first empty space is provided at the center of the first horizontal partition, and the third horizontal partition... The center of the two horizontal partition plates has a second empty space, the center of the third horizontal partition plate has a third empty space, and the center of the fourth horizontal partition plate has a fourth empty space; the first empty space, the second empty space, and the third empty space are all used to fix the PEM stack; thereby realizing the stacking and fixing of multiple PEM stacks on the upper pressure block 10 and the lower pressure block 13; the first empty space, the second empty space, the third empty space, and the fourth empty space are correspondingly arranged; the pneumatic device 11 located below the upper pressure block 10 can pass through the fourth empty space, the third empty space, and the second empty space to achieve the pressing and fixing of the top of the PEM stacks fixed on the first empty space, the second empty space, and the third empty space.

[0026] exist Figure 2In this configuration, a first stacking module is disposed in the first stacking interval, a second stacking module is disposed in the second stacking interval, and a third stacking module is disposed in the third stacking interval; wherein the first stacking module includes a first stacking base plate 3 and a plurality of first fixing posts 32; the plurality of first fixing posts 32 are vertically fixed to the inner circumference of the first stacking base plate 3; the plurality of first fixing posts 32 are located on the upper surface of the first stacking base plate 3 and are arranged in the same direction; the plurality of first fixing posts 32 are used to fix the PEM stacks to the surface of the first stacking base plate 3 respectively; the other end of the first fixing post 32 is fixedly connected to the second stacking base plate 4 of the second stacking module in the second stacking interval; the second stacking base plate 4, the first stacking module... The base plate 3 and the plurality of first fixing posts 32 are used together to position the PEM stack within the first stacking module; the pneumatic device 11 moves down and compresses the second stacking base plate 4 to achieve compression and fixation of the PEM stack; in order to improve the positioning accuracy of the PEM stack, preferably, a positioning device (not shown) is provided on the surface of the first stacking base plate 3, and the outer periphery of the PEM stack is positioned by the positioning device to establish a stacking reference, so that the dimensional consistency in the stacking direction can be maintained during the stacking of multiple PEM stacks; the positioning of PEM stacks of different sizes can be adjusted by adjusting the position of the positioning device on the surface of the first stacking base plate 3; the plurality of first fixing posts 32 are used to fix the first stacking base plate 3 and the second stacking base plate 4.

[0027] The second stacking base plate 4 has a second mounting hole 42 on its surface. The end of the first fixing post 32 is fixed to the second stacking base plate 4 through the second mounting hole 42 and bolts. The second stacking module includes a second stacking base plate 4 and a plurality of second fixing posts 43. The second fixing posts 43 are vertically fixed to the second stacking base plate 4 and are oriented away from the extending direction of the first fixing post 32. The plurality of second fixing posts 42 are spaced apart and arranged along the inner periphery of the second stacking base plate 4. The fixing position of the second fixing post 42 on the second stacking base plate 4 is different from the opening position of the second mounting hole 42 on the second stacking base plate 4. This makes the second fixing post 42 and the second mounting hole 32 fixed to the second stacking base plate 4. The mounting holes 42 are staggered; multiple second vent holes 41 are provided on the second stacking base plate 4; through the second vent holes 41, the PEM stacks located in the first stacking interval can be simultaneously tested for air tightness during the stacking process, that is, the ventilation pipe is connected to the PEM stack through the second vent holes 41 to ventilate during the stacking process and thus perform the corresponding air tightness test; multiple second fixing posts 42 are arranged around the inner circumference of the second stacking base plate 4, and the other end of the second fixing post 42 is fixedly connected to the third stacking base plate 5 of the third stacking module in the third stacking interval; the pneumatic device 11 stacks and presses the PEM stacks in the third stacking interval by squeezing the third stacking base plate 5.

[0028] The second stacking base plate 4, the third stacking base plate 5, and the plurality of second fixing posts 42 are used together to position the PEM stack within the second stacking module. The PEM stack is squeezed and fixed by the pneumatic device 11 moving down and compressing the third stacking base plate 5. To improve the positioning accuracy of the PEM stack, preferably, a positioning device (not shown) is provided on the surface of the second stacking base plate 4. The positioning device positions the outer periphery of the PEM stack, so that the dimensional consistency in the stacking direction can be maintained during the stacking of multiple PEM stacks. The positioning of PEM stacks of different sizes can be adjusted by adjusting the position of the positioning device on the surface of the second stacking base plate 4. The plurality of second fixing posts 42 are used to fix the second stacking base plate 4 and the third stacking base plate 5. By staggering the second fixing posts 42 with the second mounting holes 42, precise control of the stacking process of each PEM stack is achieved during the stacking process. Compared with an integrated stacking module, the position of the PEM stack can be adjusted by the positioning device in different intervals during the stacking process, thereby achieving precise stacking of multiple PEM stacks.

[0029] The surface of the third stacking base plate 5 is provided with a third mounting hole 52, and the end of the second fixing post 42 is fixed to the third stacking base plate 5 through the third mounting hole 52 and bolts; the third stacking module includes a third stacking base plate 5 and a plurality of third fixing posts 53; the third fixing posts 53 are vertically fixed to the third stacking base plate 5 and are arranged in a direction away from the extending direction of the second fixing post 42; the plurality of third fixing posts 53 are spaced apart and arranged along the inner periphery of the third stacking base plate 5; wherein the fixing position of the third fixing post 53 on the third stacking base plate 5 is different from that of the third mounting hole 52 on the third stacking base plate 5. The third stacking base plate 5 is positioned such that the third fixing post 53 and the third mounting hole 52 are staggered; the third stacking base plate 5 has multiple third vent holes 51; through the third vent holes 51, the PEM stack located in the second stacking interval can be simultaneously tested for air tightness during the stacking process, that is, the venting pipe is connected to the PEM stack through the third vent holes 51 to vent during the stacking process and thus perform the corresponding air tightness test; the multiple third fixing posts 53 are arranged around the inner circumference of the third stacking base plate 5, and the other end of the third fixing post 53 is fixedly connected to the fourth stacking base plate 6.

[0030] The third stacking base plate 5, the fourth stacking base plate 6, and the multiple third fixing posts 53 are used together to position the PEM stack within the third stacking module. The fourth stacking base plate 6 is compressed and pressed down by the pneumatic device 11, thus achieving the compression and fixation of the PEM stack. To improve the positioning accuracy of the PEM stack, preferably, a positioning device (not shown) is provided on the surface of the third stacking base plate 5. This positioning device positions the outer periphery of the PEM stack, ensuring dimensional consistency in the stacking direction during the stacking process. The positioning of PEM stacks of different sizes can be adjusted by adjusting the position of the positioning device on the surface of the third stacking base plate 5. The multiple third fixing posts 53 are used to fix the third stacking base plate 5 and the fourth stacking base plate 6. By staggering the third fixing posts 53 with the third mounting holes 52, precise control of the stacking process of each PEM stack is achieved. Compared to an integrated stacking module, the position of the PEM stack can be adjusted by the positioning device in different intervals during the stacking process, thereby achieving precise stacking of multiple PEM stacks.

[0031] The surface of the fourth stacking base plate 6 is provided with a plurality of fourth mounting holes 62; the other end of the third fixing post is fixed to the fourth stacking base plate 6 through the fourth mounting holes 62 on the fourth stacking base plate 6; the fourth stacking base plate 6 is provided with a plurality of fourth vent holes 61; the PEM stacks positioned in the third stacking interval are connected to an external air source through the plurality of fourth vent holes 61; so that during the stacking and positioning of the PEM stacks in the third stacking interval, the PEM stacks are vented through the plurality of fourth vent holes 61 simultaneously, thereby performing airtightness testing; the pneumatic device 11 stacks and presses the PEM stacks in the third stacking interval by squeezing the fourth stacking base plate 6.

[0032] This application also discloses a fuel cell stacking method using a multi-module fuel cell stacking fixture, including the following steps: Step 1: Place a PEM stack on the stack base plate of the stacking module closest to the lower pressure block and set multiple fixing posts around the inner circumference of the stack base plate; install an additional stack base plate at the other end of the multiple fixing posts and fix the other end of the multiple fixing posts to the stack base plate; Step 2: Drive the pneumatic device on the upper pressure block to move down and contact the additionally installed stacking base plate to press and position the PEM stack; vertically install multiple fixing posts on the other side of the additionally installed stacking base plate; the extension directions of the fixing posts on both sides of the stacking base plate do not coincide with each other; Step 3: Install another PEM stack on the surface of the additionally installed stack base plate; fix another stack base plate on the other end corresponding to the fixing post on the surface of the additionally installed stack base plate; Step 4: Drive the pneumatic device on the upper pressure block to move down and contact the stacking base plate that is fixed again, pressing and positioning another PEM stack; complete the stacking of multiple PEM stacks.

[0033] Each additional fixed stacking base plate has ventilation holes on its surface, and the pneumatic device also has multiple through holes connected to an external air source. The pneumatic device is connected to the stacked PEM stacks through gas channels. When the pneumatic device is driven to press down the stacking base plate to compact the positioned PEM stacks, air is circulated through the corresponding gas channels to the PEM stacks while airtightness testing is performed simultaneously. Based on the accurate positioning and compaction of each PEM stack, the positional displacement of the PEM stacks caused by air circulation during the airtightness testing process is reduced, thus reducing the impact on the accuracy of the test. While accurately positioning and stacking multiple PEM stacks, effective and accurate airtightness testing of the PEM stacks is performed simultaneously, improving the overall efficiency of the stacking process.

[0034] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A multi-module fuel cell stacking fixture, comprising a stacking body, multiple fixing components, and multiple stacking modules; characterized in that: The stacking body includes an upper pressing block and a lower pressing block that are arranged separately at the top and bottom; a pneumatic device is provided on the surface of the upper pressing block facing the lower pressing block; a plurality of connecting rods are arranged separately between the upper pressing block and the lower pressing block; the two ends of the connecting rods are respectively fixedly connected to the upper pressing block and the lower pressing block; Each of the connecting rods has a fixing component fixed on its side wall; the fixing components on the side wall of each connecting rod are arranged facing the interior of the stacking body; the multiple fixing components divide the gap between the upper pressure block and the lower pressure block into multiple stacking sections connected vertically; Each stacking section is provided with a corresponding stacking module; the stacking module includes a stacking base plate and multiple fixing columns; Multiple fixing posts are vertically fixed to the stacking base plate; one end of each fixing post is fixedly connected to the stacking base plate; the other end of each fixing post is fixedly connected to the stacking base plate of another adjacent stacking module; the extension direction of the fixing posts within the stacking interval does not coincide with the extension direction of the fixing posts in the adjacent stacking modules.

2. The multi-module fuel cell stacking fixture according to claim 1, characterized in that: The stack body includes an upper pressure block and a lower pressure block arranged separately. The upper pressure block is located directly above the lower pressure block. Both the upper pressure block and the lower pressure block are rectangular structures and correspond to each other. A pneumatic device is provided on the surface of the upper pressure block near the lower pressure block. The pneumatic device can move up and down in the gap formed between the upper pressure block and the lower pressure block. The pneumatic device is connected to an external gas source. Multiple through holes are opened on the surface of the pneumatic device that contacts the PEM stack.

3. The multi-module fuel cell stack tooling of claim 1, wherein: Four columnar connecting rods are provided between the upper pressure block and the lower pressure block; the four connecting rods are arranged separately, and each connecting rod is fixedly connected at both ends to the lower surface of the upper pressure block and the upper surface of the lower pressure block, respectively; the four connecting rods are arranged perpendicular to the upper pressure block and the lower pressure block, and are arranged parallel to each other; a first fixing component, a second fixing component, a third fixing component and a fourth fixing component with the same structure are fixed at intervals on the side wall of each connecting rod; the spacing between the first fixing component, the second fixing component, the third fixing component and the fourth fixing component on the side wall of each connecting rod is equal.

4. A multi-module fuel cell stack tooling as claimed in claim 3, wherein: The fixing component is provided with a hinge; the fixing component is a foldable plate structure; the fixing component is folded by the hinge.

5. A multi-module fuel cell stacking fixture according to claim 3, characterized in that: The first fixing components corresponding to the four separately set connecting rods are all located on the same horizontal plane and together form a first horizontal partition plate that is perpendicular to the connecting rods. The first fixing components corresponding to the four separately set connecting rods are all set towards the center of the stacked body. The second fixing components corresponding to the four separately set connecting rods are all located on the same horizontal plane and together form a second horizontal partition plate that is perpendicular to the connecting rods. The second fixing components corresponding to the four separately set connecting rods are all set towards the center of the stacked body. The third fixing components corresponding to the four separately set connecting rods are all located on the same horizontal plane and together form a third flat partition plate that is perpendicular to the connecting rods. The third fixing components 23 corresponding to the four separately set connecting rods are all set towards the center of the stacked body. The first fixing components corresponding to the four separately set connecting rods are all located on the same horizontal plane and together form a fourth horizontal partition plate that is perpendicular to the connecting rods. The fourth fixing components corresponding to the four separately set connecting rods are all set towards the center of the stacked body. The area between the first horizontal partition and the second horizontal partition is the first stacking interval, the area between the second horizontal partition and the third horizontal partition is the second stacking interval, and the area between the third horizontal partition and the fourth horizontal partition is the third stacking interval.

6. A multi-module fuel cell stack tooling as claimed in claim 5, wherein: A first stacking module is provided in the first stacking interval, a second stacking module is provided in the second stacking interval, and a third stacking module is provided in the third stacking interval; The first stacking module includes a first stacking base plate and a plurality of first fixing posts; Multiple first fixing posts are vertically fixed to the inner circumference of the first stacking base plate; Multiple first fixing posts are located on the upper surface of the first stacking base plate and are arranged in the same direction; the other end of the first fixing post is fixedly connected to the second stacking base plate of the second stacking module in the second stacking interval; The second stacking module includes a second stacking base plate and a plurality of second fixing posts; The second fixing post is vertically fixed to the second stacking base plate and is oriented away from the extension direction of the first fixing post; Multiple second fixing posts are separated and arranged along the inner periphery of the second stacked base plate; The fixing position of the second fixing post on the second stack base plate is different from the opening position of the second mounting hole on the second stack base plate; The other end of the second fixing post is fixedly connected to the third stacking base plate of the third stacking module in the third stacking interval; The third stacking module includes a third stacking base plate and multiple third fixing posts; The third fixing post is vertically fixed to the third stacking base plate and is oriented away from the extending direction of the second fixing post; The plurality of the third fixing posts are separated and arranged along the inner periphery of the third stacked base plate; The fixing position of the third fixing post on the third stacking base plate is different from the opening position of the third mounting hole on the third stacking base plate; the other end of the third fixing post is fixedly connected to the fourth stacking base plate.

7. A multi-module fuel cell stack tooling as claimed in claim 6, wherein: The surface of the second stacking base plate is provided with a plurality of second vent holes; the surface of the second stacking base plate is provided with second mounting holes; the fixing position of the second fixing post on the second stacking base plate is different from the opening position of the second mounting holes on the second stacking base plate; The third stack base plate is provided with a plurality of third ventilation holes; the surface of the third stack base plate is provided with third mounting holes; the fixing position of the third fixing post on the third stack base plate is different from the opening position of the third mounting holes on the third stack base plate. The fourth stack base plate has multiple fourth vent holes.

8. A multi-module fuel cell stack tooling as claimed in claim 6, wherein: A positioning device is provided on the surface of the first stacking base plate; a positioning device is provided on the surface of the second stacking base plate. A positioning device is provided on the surface of the third stacking base plate; the positioning device on the stacking base plate is used to position the outer periphery of the PEM stack located in the corresponding stacking interval.

9. A fuel cell stacking method using the multi-module fuel cell stacking fixture according to any one of claims 1 to 8, characterized in that: Includes the following steps: Step 1: Place a PEM stack on the stack base plate of the stacking module closest to the lower pressure block and set multiple fixing posts around the inner circumference of the stack base plate; An additional stacking base plate is installed at the other end of the multiple fixed columns, and the other ends of the multiple fixed columns are fixed to the stacking base plate; Step 2: Drive the pneumatic device on the upper pressure block to move down and contact the additionally installed stacking base plate to press and position the PEM stack; vertically install multiple fixing posts on the other side of the additionally installed stacking base plate; The extension directions of the fixing posts located on both sides of the stacked base plate do not coincide with each other; Step 3: Install another PEM stack on the surface of the additionally installed stack base plate; fix another stack base plate on the other end corresponding to the fixing post on the surface of the additionally installed stack base plate; Step 4: Drive the pneumatic device on the upper pressure block to move down and contact the stacking base plate that is fixed again, pressing and positioning another PEM stack; complete the stacking of multiple PEM stacks.

10. A stacking method according to claim 9, characterized in that: Each additional fixed stack base plate has ventilation holes on its surface, and the pneumatic device has multiple through holes and is connected to an external air source; the pneumatic device is connected to the stacked PEM stack through a gas channel.

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