MEA seven-in-one stacking device

Abstract

The utility model discloses a kind of MEA seven-in-one stacking devices, including bottom plate and detachable positioning plate. Positioning rod is provided on bottom plate, for fixing MEA and polar plate. Detachable positioning plate is formed by two pieces of L-shaped parts transversely assembled, and is provided with the first positioning hole for positioning rod to pass through and the positioning through slot for GDL positioning. The core of the device is to integrate seven-in-one laminating process and stack process, cancel the traditional GDL dispensing link, directly fix GDL using the final stack pressure of electric pile. The design does not need special equipment such as dispensing and hot pressing, simplifies the process, improves production efficiency, and at the same time, completely solves the problem of uneven pressure distribution and chemical pollution caused by glue line, suitable for efficient and high-quality assembly of fuel cell stack.

Description

Technical Field

[0001] This utility model belongs to the field of fuel cells, and in particular relates to a MEA seven-in-one stacking device. Background Technology

[0002] A fuel cell is an electrochemical reaction device that directly converts the chemical energy in fuel into electrical energy. Depending on the electrolyte and operating conditions, there are five main types. Among them, proton exchange membrane fuel cells (PEMFCs) are widely recognized as the most likely replacement for internal combustion engines and batteries as the ideal power source for electric vehicles due to their unique advantages, such as no pollution, rapid start-up, long battery life, high specific power, high specific energy, and low operating temperature. They can also be developed into distributed independent power sources for various portable power supplies, and have a very broad market.

[0003] Currently, most existing seven-in-one bonding processes involve first applying adhesive to the anode and cathode gas diffusion layers (GDLs) before performing the seven-in-one bonding process, as illustrated by invention patent publication number CN113270620A. The adhesive application process has certain drawbacks, such as: ① High equipment requirements: a single adhesive application step requires a dedicated dispensing machine, bonding fixtures, and a hot press. ② Long curing time for adhesive bonding reduces production efficiency. ③ The thickness of the adhesive lines can lead to thickness differences between the MEA and the electrode plates during stacking, resulting in uneven stress distribution. ④ During fuel cell stack operation, chemical elements in the adhesive can seep into the MEA and electrode plates, affecting stack performance and durability.

[0004] The invention patent with publication number CN117638105A provides a method for preparing a membrane electrode, which can combine the cathode GDL, anode GDL, CCM and frame in one step. Compared with the prior art, it avoids the cumbersome dispensing and multiple bonding and shape punching steps, but still does not solve the above problems. Summary of the Invention

[0005] To address the above shortcomings, this invention provides a seven-in-one device that simultaneously performs bonding and stacking, significantly reducing working time and eliminating the need for additional equipment. The GDL dispensing process is eliminated; GDL bonding is performed during stacking using positioning fixtures, and the stacking force itself provides compression and fixation. GDL bonding eliminates the need for adhesive lines, thus resolving a series of problems associated with adhesive lines.

[0006] This utility model provides a MEA seven-in-one stacking device, including: A base plate, the top surface of which is provided with a positioning rod; The detachable positioning plate is formed by horizontally assembling two positioning parts. A first positioning hole for the positioning rod to pass through is assembled on the splicing surface of the two positioning parts. The detachable positioning plate is also provided with a positioning through groove for GDL positioning. The positioning through groove is also assembled on the splicing surface of the two positioning parts.

[0007] This design forms the core of the seven-in-one bonding and stacking device. Its function is to eliminate the traditional GDL dispensing process and instead use the stacking force of the stacking process itself for compression and fixation, thereby fundamentally avoiding the problems of uneven pressure and chemical pollution caused by the glue line.

[0008] Furthermore, the positioning rods include two rods located on the top surface of the base plate, with the two positioning rods positioned at two diagonally opposite corners of the top surface, for fixing the membrane electrode (MEA) and electrode plates to prevent misalignment during the stacking process.

[0009] Preferably, both positioning parts are L-shaped.

[0010] Furthermore, a positioning protrusion and a second positioning hole are provided between the end face of one arm of one L-shaped structure and the end face of the adjacent arm of another L-shaped structure.

[0011] The aforementioned pin-type structural design ensures precise tooling assembly and easy disassembly. It is a concrete structural guarantee for achieving the key point of "positioning tooling that can be removed from both sides of the positioning rod", ensuring that GDL can be stably positioned during subsequent stacking and that the tooling can be easily removed when needed.

[0012] Furthermore, the symmetrical design of the two positioning parts improves assembly efficiency and the versatility of the tooling.

[0013] Furthermore, the base plate is an end plate used for stacking fuel cell stacks. After stacking each structure sequentially using the MEA seven-in-one stacking device, an end plate is installed on the top surface and fixed between it and the end plate serving as the base plate to obtain the fuel cell stack.

[0014] Using the stack end plate directly as the base plate of the device has the following advantages: it greatly simplifies the device structure, eliminates the need for additional special tooling and equipment, and the clamping force formed after stacking is directly applied to the GDL to fix it completely, thus solving the problem of GDL detachment in traditional processes.

[0015] Compared with the prior art, the present invention has the following advantages: 1. No need for dispensing machines, hot presses, or other dispensing equipment, reducing equipment requirements; 2. Solves problems such as uneven pressure distribution caused by adhesive lines during stacking; 3. Solves the problem of chemical elements entering the catalyst layer and electrode plates from MEA adhesive lines during stack operation; 4. Higher efficiency, eliminating the need to wait for adhesive curing time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the MEA seven-in-one stacking device of this utility model; Figure 2 This is a side view of the MEA seven-in-one stacking device of this utility model; Figure 3 This is a disassembly diagram of the MEA seven-in-one stacking device of this utility model; Figure 4 This is a disassembly diagram of the MEA seven-in-one stacking device of this utility model; Figure 5 This is a schematic diagram of the positioning parts; Figure 6 For GDL.

[0017] The markings in the diagram are: 1-base plate, 11-positioning rod, 2-removable positioning plate, 21-positioning part, 211-positioning protrusion, 212-second positioning hole, 22-first positioning hole, 23-positioning through groove, 3-GDL. Detailed Implementation

[0018] Depend on Figures 1-6 As shown, this utility model provides a MEA seven-in-one stacking device, including: The base plate 1 has a positioning rod 11 on its top surface; The detachable positioning plate 2 is formed by horizontally assembling two positioning parts 21. The first positioning hole 22 for the positioning rod 11 to pass through is assembled on the splicing surface of the two positioning parts 21. The detachable positioning plate 2 is also provided with a positioning through groove 23 for positioning GDL (3). The positioning through groove 23 is also formed by assembling the splicing surface of the two positioning parts 21.

[0019] The device of this invention utilizes the inherent stacking force of the stacking process itself for compression and fixation, eliminating the traditional GDL dispensing process and thus fundamentally avoiding the problems of uneven pressure and chemical pollution caused by the glue line.

[0020] The positioning rods 11 include two rods located on the top surface of the base plate 1. The two positioning rods 11 are located at two opposite corners of the top surface and are used to fix the MEA and the electrode plates to prevent misalignment during the stacking process.

[0021] Depend on Figure 5As shown, this utility model designs two positioning parts, both of which are L-shaped. One end face of one arm of the L-shaped structure and the end face of the adjacent arm of the other L-shaped structure are provided with a mutually cooperating positioning protrusion 211 and a second positioning hole 212. Figure 5 In this invention, the second positioning hole is set as a non-penetrating blind hole, which makes the tooling assembly accurate and easy to disassemble, ensuring that the GDL can be stably positioned during subsequent stacking, and the tooling can be easily removed when needed.

[0022] Moreover, the symmetrical design of the two positioning parts 21 can improve assembly efficiency and tooling versatility.

[0023] In use, the base plate 1 is the end plate for stacking fuel cell stacks. After stacking each structure in sequence using the MEA seven-in-one stacking device, an end plate is installed on the top surface and fixed to the end plate that serves as the base plate to obtain the fuel cell stack.

[0024] When using this utility model device, firstly, place the positioning base consisting of the end plate as the base plate 1 and the positioning rod 11 on a horizontal platform; then place an electrode plate through the positioning rod 11, assemble the detachable positioning plate 2 above the electrode plate and fix it on the positioning rod 11; then place a GDL (3) into the positioning through slot 23 of the detachable positioning plate 2, and then cover the detachable positioning plate 2 above the five-in-one MEA assembly through the positioning rod 11; then disassemble and move the detachable positioning plate 2 horizontally so that the MEA automatically falls off and precisely fits the GDL below; repeat this process to stack the tooling, GDL and electrode plate on the other side of the MEA until the stack is completed; finally, install the top end plate and use the stack clamping force to completely fix the GDL to prevent the GDL from falling off during operation.

Claims

1. A MEA seven-in-one stacking device, characterized in that, include: A base plate, the top surface of which is provided with a positioning rod; The detachable positioning plate is formed by horizontally assembling two positioning parts. A first positioning hole for the positioning rod to pass through is assembled on the splicing surface of the two positioning parts. The detachable positioning plate is also provided with a positioning through groove for GDL positioning. The positioning through groove is also assembled on the splicing surface of the two positioning parts.

2. The MEA seven-in-one stacking device according to claim 1, characterized in that, The positioning rods include two rods located on the top surface of the base plate, with the two positioning rods located at two diagonally opposite corners of the top surface.

3. The MEA seven-in-one stacking device according to claim 1, characterized in that, Both of the aforementioned positioning parts are L-shaped.

4. The MEA seven-in-one stacking device according to claim 3, characterized in that, One of the L-shaped structures has a positioning protrusion and a second positioning hole that match each other between the end face of one arm and the end face of the adjacent arm of the other L-shaped structure.

5. The MEA seven-in-one stacking device according to claim 3, characterized in that, The two positioning parts are designed symmetrically.

6. The MEA seven-in-one stacking device according to claim 1, characterized in that, The base plate is an end plate used for stacking fuel cell stacks. After stacking each structure in sequence using the MEA seven-in-one stacking device, an end plate is installed on the top surface and fixed to the end plate, which serves as the base plate, to obtain the fuel cell stack.

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