Packaging method and packaging structure of single-frame membrane electrode

Abstract

The invention relates to the field of membrane electrodes, and discloses a packaging method and a packaging structure of a single-frame membrane electrode, a frame substrate is respectively connected with a first sealing element and a second sealing element to form a first assembly, the first assembly is connected with a first gas diffusion layer to form a second assembly, and a catalyst coating CCM is connected with a second gas diffusion layer to form a single-frame membrane electrode. And assembling and aligning the second assembly and the third assembly through a mold, and carrying out hot pressing to form the single-frame membrane electrode with the sealing element. The fuel cell stack has the beneficial effects that the sealing element for stack assembly and the membrane electrode are assembled together in advance, so that the assembly process of the rear-end fuel cell stack is greatly simplified, the assembly precision is high, the sealing element and the frame have good adhesion and are not easy to move, the reworking condition caused by irregular alignment of the sealing element in the stack assembly process is avoided, and the production efficiency is improved. The assembly efficiency and the yield of the electric pile are improved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of membrane electrodes, and in particular to a packaging method and a packaging structure of a single-frame membrane electrode. Background Art

[0002] At present, the fuel cell stack sealing process can be divided into the lamination sealing process and the overall gluing packaging process. In the lamination sealing process, silicone is generally used as the sealing material, which is formed on the bipolar plate by dispensing or injection. After the stack is stacked, the sealing material is pressed by assembly pressure to achieve the sealing of the stack gas field. The advantage of this method is that the stack can be disassembled more conveniently, and the operating status of the battery plate or membrane electrode can be checked and analyzed more intuitively, which is convenient for optimizing the design scheme. The disadvantage is that the fitting between the sealing strip and the bipolar plate is achieved by applying pressure, and the adhesion between the two is poor, which is prone to problems such as misalignment. During the curing process, impurities in the bipolar plate, especially the graphite bipolar plate, are easily introduced into the strip to form defect points. Therefore, this process has relatively high requirements for equipment (such as high-precision visual positioning, dispensing or injection equipment, and additional curing processes), and the investment in production line equipment is often relatively high. The other is the fully glued packaging process, which uses special glue and stack structure design to glue the battery panel and MEA as a whole to achieve permanent sealing of the gas field (non-removable). It has the advantages of high production efficiency, reliable sealing effect, flexible production process and low equipment production line investment cost, but it has high requirements for glue materials. Summary of the invention

[0003] The purpose of the present application is to provide a packaging method and packaging structure for a single-frame film electrode to simplify the assembly process, improve assembly accuracy, and enhance assembly efficiency.

[0004] The purpose of this application is achieved through the following technical solutions:

[0005] A packaging method for a single-frame film electrode comprises the following steps:

[0006] S1: connecting the first surface and the second surface of the frame substrate to the first sealing member and the second sealing member respectively to form a first assembly, wherein the first surface and the second surface are large planes opposite to the frame substrate;

[0007] S2: connecting one side of the first assembly to a first gas diffusion layer to form a second assembly, wherein the first gas diffusion layer is connected to the first surface of the frame substrate;

[0008] S3: coating a cathode catalyst layer and an anode catalyst layer on both sides of the proton exchange membrane, and obtaining a three-layer catalyst coating CCM after drying;

[0009] S4: connecting the catalyst coating CCM with the second gas diffusion layer to form a third assembly;

[0010] S5: aligning the second assembly and the third assembly through a mold assembly, and hot pressing them with a servo press to form a single-frame membrane electrode with a seal, wherein the catalyst coating CCM is connected to the second surface of the frame substrate.

[0011] In some embodiments of the present application, in step S1, a primer is coated on the fitting area between the frame substrate and the first sealant, a primer is coated on the fitting area between the frame substrate and the second sealant, the first sealant is directly injected onto the first surface by a glue injection machine, the second sealant is directly injected onto the second surface by a glue injection machine, and the frame substrate, the first sealant and the second sealant are solidified and formed as a whole.

[0012] In some embodiments of the present application, the curing temperature of the frame substrate, the first sealant and the second sealant is 100° C. to 150° C., and the curing time is 1 min to 10 min.

[0013] In some embodiments of the present application, the curing temperature of the frame substrate, the first sealant and the second sealant is 110° C., and the curing time is 3 minutes.

[0014] In some embodiments of the present application, in step S2, the first assembly and the first gas diffusion layer are bonded together by an adhesive.

[0015] In some embodiments of the present application, in step S4, the catalyst coating layer CCM and the second gas diffusion layer are bonded together by an adhesive.

[0016] In some embodiments of the present application, the first assembly is bonded to the first gas diffusion layer by cold pressing, and the catalyst coating layer CCM is bonded to the second gas diffusion layer by cold pressing.

[0017] In some embodiments of the present application, in step S5, the heat pressing temperature is 100°C to 150°C, the heat pressing pressure is 1T to 5T, and the heat pressing time is 10s to 60s.

[0018] In some embodiments of the present application, the heat pressing temperature is 130° C., the heat pressing pressure is 3T, and the heat pressing time is 30 s.

[0019] A packaging structure of a single-frame membrane electrode manufactured by the packaging method as described above, characterized in that it includes a frame substrate, a first seal, a second seal, a first gas diffusion layer, a catalyst coating CCM and a second gas diffusion layer, the first seal and the second seal are respectively arranged on the first surface and the second surface of the frame substrate, the first gas diffusion layer is connected to the first surface of the frame substrate, the catalyst coating CCM is connected to the second surface of the frame substrate, and the second gas diffusion layer is connected to the side of the catalyst coating CCM away from the first gas diffusion layer, wherein the first seal and the second seal are located on the outside of the frame substrate, and the first gas diffusion layer, the catalyst coating CCM and the second gas diffusion layer are located on the inside of the frame substrate.

[0020] The packaging method and packaging structure of the single-frame membrane electrode of the present application assemble the seal and the membrane electrode for stack assembly together in advance, which greatly simplifies the assembly process of the back-end fuel cell stack, and has high assembly precision. The seal has good adhesion to the frame and is not easy to move, avoiding rework due to misalignment of the seal during the stack assembly process, improving the stack assembly efficiency and yield rate, reducing costs, and ultimately obtaining a single-frame membrane electrode and seal integrated packaging structure with good sealing performance, simple structure, and reliable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a top view of the packaging structure of the single-frame film electrode of the present application;

[0022] Figure 2 It is a cross-sectional view of the packaging structure of the single-frame film electrode of the present application;

[0023] Figure 3 It is a structural schematic diagram of the first combination of the present application;

[0024] Figure 4 It is a structural schematic diagram of the second combination of the present application;

[0025] Figure 5 It is a schematic diagram of the structure of the third combination of the present application.

[0026] In the figure, 1, frame substrate; 11, first surface; 12, second surface; 2, first sealing member; 3, second sealing member; 4, first gas diffusion layer; 5, catalyst coating CCM; 6, second gas diffusion layer;

[0027] 100, first assembly; 200, second assembly; 300, third assembly. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. used in the present application to indicate the orientation or position relationship is based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be a connection between two elements or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1-Figure 5 As shown, a first aspect of an embodiment of the present application provides a packaging method for a single-frame film electrode, comprising the following steps:

[0032] S1: Connect the first surface 11 and the second surface 12 of the frame substrate 1 to the first sealing member 2 and the second sealing member 3 respectively to form a first assembly 100, wherein the first surface 11 and the second surface 12 are large planes opposite to the frame substrate 1;

[0033] S2: connecting one side of the first assembly 100 to the first gas diffusion layer 4 to form a second assembly 200, wherein the first gas diffusion layer 4 is connected to the first surface 11 of the frame substrate 1;

[0034] S3: coating a cathode catalyst layer and an anode catalyst layer on both sides of the proton exchange membrane, and obtaining a three-layer catalyst coating CCM5 after drying;

[0035] S4: connecting the catalyst coating CCM5 and the second gas diffusion layer 6 to form a third assembly 300;

[0036] S5: aligning the second assembly 200 and the third assembly 300 through a mold assembly, and hot pressing them with a servo press to form a single-frame membrane electrode with a seal, wherein the catalyst coating CCM5 is connected to the second surface 12 of the frame substrate 1 .

[0037] Based on the above technical scheme, the packaging method of the single-frame membrane electrode of the present application assembles the seal for stack assembly with the membrane electrode in advance, greatly simplifies the assembly process of the back-end fuel cell stack, and has high assembly precision, good adhesion between the seal and the frame, and is not easy to move, avoiding rework caused by misalignment of the seal during the stack assembly process, improving the stack assembly efficiency and yield rate, reducing costs, and finally obtaining a single-frame membrane electrode and seal integrated packaging structure. It should be noted that CCM is the abbreviation of catalyst coated membrane, which is the place where the electrochemical reaction of the fuel cell occurs, and is a fuel cell chip.

[0038] In some embodiments of the present application, Figure 2-Figure 4 As shown, in step S1, the fitting area between the frame substrate 1 and the first sealant 2 is coated with a primer, the fitting area between the frame substrate 1 and the second sealant 3 is coated with a primer, the first sealant 2 is directly injected to the first surface 11 by a glue injection machine, the second sealant 3 is directly injected to the second surface 12 by a glue injection machine, and the frame substrate 1, the first sealant 2 and the second sealant 3 are integrally solidified. Compared with the conventional battery stack with a single sealing strip as a sealant, the present application has a first sealant 2 and a second sealant 3, and two sealing strips are designed between the frame substrate 1 and the sealant. When one of the sealing strips is abnormal or fails, the other sealing strip can also play a sealing role, which greatly improves the sealing reliability and sealing durability of the battery stack, and the integral solidification molding method after the injection of the glue injection machine also makes the molding effect better and the sealing effect more stable.

[0039] Specifically, the curing temperature of the frame substrate 1, the first seal 2 and the second seal 3 is 100° C. to 150° C., and the curing time is 1 min to 10 min. Setting the curing conditions to the above range can effectively improve the curing effect, and make the molding effect and sealing effect better.

[0040] More specifically, the curing temperature of the frame substrate 1, the first seal 2 and the second seal 3 is 110° C. and the curing time is 3 minutes. The curing temperature and time are 110° C. and 3 minutes respectively, which can further achieve the purpose of improving the molding effect and the sealing effect.

[0041] In some embodiments of the present application, Figure 4As shown, in step S2, the first assembly 100 is bonded to the first gas diffusion layer 4 by an adhesive. The adhesive can simply and conveniently connect the first assembly 100 and the first gas diffusion layer 4 together to achieve a reliable connection between the two.

[0042] Specifically, Figure 5 As shown, in step S4, the catalyst coating CCM5 and the second gas diffusion layer 6 are bonded together by an adhesive. Similarly, the adhesive can simply and conveniently connect the catalyst coating CCM5 and the second gas diffusion layer 6 together to achieve a reliable connection between the two.

[0043] More specifically, Figure 4 , Figure 5 As shown, the first assembly 100 is bonded to the first gas diffusion layer 4 by cold pressing, and the catalyst coating CCM5 is bonded to the second gas diffusion layer 6 by cold pressing. The single-frame membrane electrode cathode and anode gas diffusion layers can be firmly bonded to the catalyst coating CCM5 or the frame by a short cold pressing through an adhesive, thereby improving production efficiency. Moreover, since the hot pressing process is reduced, the catalyst coating CCM5 is less affected by expansion and contraction caused by temperature changes, and the phenomenon of bulging and warping of the membrane electrode product will also be reduced, and the product appearance will be smoother.

[0044] In some embodiments of the present application, in step S5, the heat pressing temperature is 100°C to 150°C, the heat pressing pressure is 1T to 5T, and the heat pressing time is 10s to 60s. The heat pressing temperature, pressure and time are all within a suitable value range, and the connected assembly can be installed efficiently and reliably.

[0045] Specifically, the heat pressing temperature is 130° C., the heat pressing pressure is 3T, and the heat pressing time is 30 seconds. Using more precise temperature, pressure, and time can further improve the heat pressing effect and improve assembly efficiency.

[0046] like Figure 1-Figure 5As shown, the second aspect of the embodiment of the present application proposes a packaging structure of a single-frame film electrode made by the above-mentioned packaging method, comprising a frame substrate 1, a first seal 2, a second seal 3, a first gas diffusion layer 4, a catalyst coating CCM5 and a second gas diffusion layer 6, wherein the first seal 2 and the second seal 3 are respectively arranged on the first surface 11 and the second surface 12 of the frame substrate 1, the first gas diffusion layer 4 is connected to the first surface 11 of the frame substrate 1, the catalyst coating CCM5 is connected to the second surface 12 of the frame substrate 1, and the second gas diffusion layer 6 is connected to the side of the catalyst coating CCM5 away from the first gas diffusion layer 4, wherein the first seal 2 and the second seal 3 are located on the outside of the frame substrate 1, and the first gas diffusion layer 4, the catalyst coating CCM5 and the second gas diffusion layer 6 are located on the inside of the frame substrate 1. By adopting the above-mentioned packaging method, a packaging structure of a single-frame film electrode and a seal integrated with each other can be obtained, which has good sealing performance, simple structure and reliable use.

[0047] In summary, the packaging method and packaging structure of the single-frame membrane electrode of the present application assemble the seal and membrane electrode used for stack assembly together in advance, which greatly simplifies the assembly process of the back-end fuel cell stack, and has high assembly precision, good adhesion between the seal and the frame, and is not easy to move, thereby avoiding rework caused by misalignment of the seal during the stack assembly process, improving the stack assembly efficiency and yield rate, reducing costs, and ultimately obtaining a single-frame membrane electrode and seal integrated packaging structure, which has good sealing performance, simple structure, and reliable use.

[0048] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. A packaging method for a single-frame film electrode, characterized in that: The steps include: S1: connecting the first surface and the second surface of the frame substrate to the first sealing member and the second sealing member respectively to form a first assembly, wherein the first surface and the second surface are large planes opposite to the frame substrate; S2: connecting one side of the first assembly to a first gas diffusion layer to form a second assembly, wherein the first gas diffusion layer is connected to the first surface of the frame substrate; S3: coating a cathode catalyst layer and an anode catalyst layer on both sides of the proton exchange membrane, and obtaining a three-layer catalyst coating CCM after drying; S4: connecting the catalyst coating CCM with the second gas diffusion layer to form a third assembly; S5: aligning the second assembly and the third assembly through a mold assembly, and hot pressing them with a servo press to form a single-frame membrane electrode with a seal, wherein the catalyst coating CCM is connected to the second surface of the frame substrate.

2. The packaging method of the single-frame film electrode according to claim 1, characterized in that: In step S1, a primer is coated on a fitting area between the frame substrate and the first sealant, a primer is coated on a fitting area between the frame substrate and the second sealant, the first sealant is directly injected onto the first surface by a glue injection machine, the second sealant is directly injected onto the second surface by a glue injection machine, and the frame substrate, the first sealant and the second sealant are integrally cured and formed.

3. The packaging method of the single-frame film electrode according to claim 2, characterized in that: The curing temperature of the frame substrate, the first sealing member and the second sealing member is 100° C. to 150° C., and the curing time is 1 min to 10 min.

4. The packaging method of the single-frame film electrode according to claim 3, characterized in that: The curing temperature of the frame substrate, the first sealing member and the second sealing member is 110° C., and the curing time is 3 minutes.

5. The packaging method of the single-frame film electrode according to claim 1, characterized in that: In step S2, the first assembly and the first gas diffusion layer are bonded together by an adhesive.

6. The packaging method of the single-frame film electrode according to claim 5, characterized in that: In step S4, the catalyst coating layer CCM and the second gas diffusion layer are bonded together by an adhesive.

7. The packaging method of the single-frame film electrode according to claim 6, characterized in that: The first assembly is bonded to the first gas diffusion layer by cold pressing, and the catalyst coating CCM is bonded to the second gas diffusion layer by cold pressing.

8. The packaging method of a single-frame film electrode according to claim 1, characterized in that: In step S5, the heat pressing temperature is 100°C to 150°C, the heat pressing pressure is 1T to 5T, and the heat pressing time is 10s to 60s.

9. The packaging method of the single-frame film electrode according to claim 8, characterized in that: The hot pressing temperature was 130°C, the hot pressing pressure was 3T, and the hot pressing time was 30s.

10. A packaging structure of a single-frame film electrode manufactured by the packaging method according to any one of claims 1 to 9, characterized in that: It includes a frame substrate, a first seal, a second seal, a first gas diffusion layer, a catalyst coating CCM and a second gas diffusion layer, wherein the first seal and the second seal are respectively arranged on the first surface and the second surface of the frame substrate, the first gas diffusion layer is connected to the first surface of the frame substrate, the catalyst coating CCM is connected to the second surface of the frame substrate, and the second gas diffusion layer is connected to the side of the catalyst coating CCM away from the first gas diffusion layer, wherein the first seal and the second seal are located on the outside of the frame substrate, and the first gas diffusion layer, the catalyst coating CCM and the second gas diffusion layer are located on the inside of the frame substrate.

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