A membrane electrode packaging process and membrane electrode

Abstract

This invention discloses a membrane electrode assembly (MEA) encapsulation process and MEA, belonging to the field of fuel cell technology. The MEA encapsulation process includes the following steps: hot-pressing two layers of first frame membranes onto both sides of a core membrane (CCM) using a first adhesive; and cold-pressing two layers of second frame membranes onto the outer sides of the two first frame membranes using a second adhesive. The first adhesive bonds the first frame membranes to the CCM via hot-pressing, while the second adhesive bonds the second frame membranes to their corresponding first frame membranes via cold-pressing. No heating is required when bonding the second frame membranes, thus avoiding any impact on the first adhesive and effectively preventing adhesive overflow during four-layer frame membrane encapsulation, thereby improving the performance of the MEA.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to a membrane electrode packaging process and a membrane electrode. Background Technology

[0002] For bipolar fuel cells, in order to compensate for the thickness of the frame membrane and avoid gas leakage after the stack is encapsulated, four layers of frame membrane are often used to encapsulate the CCM (catalyst coated membrane). The CCM has a three-layer structure, with two inner frame membranes attached to the two sides of the CCM respectively, and two outer frame membranes attached to the outside of the two inner frame membranes respectively.

[0003] In existing technologies, the adhesive layers of the four-layer border film all use hot melt adhesive, which is cured by hot pressing. Hot melt adhesive itself is a solid, which is convenient for packaging and storage, and also has the advantages of simple production process, high added value, strong adhesion, and fast speed. However, due to the large thickness of the four-layer border film, the use of single hot pressing encapsulation is prone to adhesive overflow, which affects the performance of the membrane electrode. Summary of the Invention

[0004] The purpose of this invention is to provide a membrane electrode encapsulation process and membrane electrode, which solves the problem of adhesive overflow that easily occurs during frame membrane encapsulation.

[0005] To achieve the above objectives, the following technical solution is provided:

[0006] On the one hand, a membrane electrode encapsulation process is provided, including the following steps:

[0007] The two layers of the first frame film are bonded to both sides of the CCM by hot pressing using a first adhesive.

[0008] Two layers of second frame film are bonded to the outside of the two layers of first frame film by cold pressing using a second adhesive.

[0009] As an optional solution for the membrane electrode encapsulation process, before bonding the two first frame films to both sides of the CCM using a first adhesive via hot pressing, the process further includes:

[0010] Cut the first border film to cut out the first channel corresponding to the active area of ​​the CCM;

[0011] Before cold-pressing the two layers of second frame film onto the outer sides of the two layers of first frame film using a second adhesive, the process further includes:

[0012] The second border film is cut to cut out a second channel corresponding to the active area of ​​the CCM; the cross-sectional area of ​​the second channel is larger than the cross-sectional area of ​​the first channel, and the cross-section is a cross-section perpendicular to the flow direction of the channel;

[0013] While cold-pressing two layers of second frame film onto the outer sides of the two layers of first frame film using a second adhesive, the process also includes:

[0014] Configure the second channel to correspond with the first channel.

[0015] As an optional solution for the membrane electrode encapsulation process, after cold-pressing two layers of second frame films onto the outer sides of the two layers of first frame films using a second adhesive, the process further includes:

[0016] Two layers of GDL are placed in the second channels of the two second-border films respectively, and the two layers of GDL are cold-pressed to the outside of the two first-border films respectively using a second adhesive, thus covering the corresponding first channels.

[0017] As an optional solution for membrane electrode encapsulation process, the minimum overlap width between the GDL and the first frame membrane is 1mm-5mm.

[0018] As an optional solution for the membrane electrode encapsulation process, the thickness of the second frame film is 70μm-180μm.

[0019] As an alternative to the membrane electrode encapsulation process, under vacuum conditions, two layers of second frame films are cold-pressed together using a second adhesive to attach them to the outer sides of the two layers of first frame films.

[0020] As an optional solution for membrane electrode encapsulation process, the first adhesive is a hot melt adhesive;

[0021] The second adhesive is a pressure-sensitive adhesive.

[0022] On the other hand, a membrane electrode is provided, comprising:

[0023] CCM;

[0024] Two first frame films are respectively attached to both sides of the CCM, and a first adhesive is provided between the first frame films and the CCM. The first adhesive is configured to bond the first frame films to the CCM by hot pressing.

[0025] Two second frame films are respectively attached to the outside of two first frame films, and a second adhesive is provided between the second frame films and the corresponding first frame films. The second adhesive is configured to bond the second frame films to the corresponding first frame films by cold pressing.

[0026] As an alternative to the membrane electrode, the first frame membrane is provided with a first channel corresponding to the active region of the CCM, and the second frame membrane is provided with a second channel corresponding to the active region of the CCM.

[0027] The cross-sectional area of ​​the second channel is larger than that of the first channel, and the second channel is arranged correspondingly to the first channel. The cross-section is a cross-section perpendicular to the flow direction of the channel.

[0028] The membrane electrode further includes two layers of GDL, which are respectively located in the second channels of the two second frame films, and the GDL are attached to the outside of the corresponding first frame film and cover the first channel.

[0029] As an alternative to the membrane electrode, the GDL is bonded to the corresponding first frame membrane using the second adhesive.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] The membrane electrode encapsulation process of this invention employs a hot-pressing method to first attach the inner first frame film to both sides of the CCM, and then a cold-pressing method to attach the outer second frame film to the outside of the two first frame films. In other words, the first adhesive can bond the first frame film to the CCM through hot pressing, and the second adhesive can bond the second frame film to the corresponding first frame film through cold pressing. No heating is required when bonding the second frame film, which will not affect the first adhesive. This effectively avoids the problem of adhesive overflow when encapsulating four-layer frame films, and is beneficial to improving the performance of the membrane electrode.

[0032] In the membrane electrode of the present invention, the first adhesive can bond the first frame film to the CCM by hot pressing, and the second adhesive can bond the second frame film to the corresponding first frame film by cold pressing. No heating is required when bonding the second frame film, which will not affect the first adhesive. This can effectively avoid the problem of adhesive overflow when encapsulating four-layer frame films, and is beneficial to improving the performance of the membrane electrode. Attached Figure Description

[0033] Figure 1 This is a simplified flowchart of the membrane electrode packaging process in an embodiment of the present invention;

[0034] Figure 2This is a detailed flowchart of the membrane electrode packaging process in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the state of the membrane electrode during the packaging process in an embodiment of the present invention. Figure 1 ;

[0036] Figure 4 This is a schematic diagram of the state of the membrane electrode during the packaging process in an embodiment of the present invention. Figure 2 ;

[0037] Figure 5 This is a schematic diagram of the state of the membrane electrode during the packaging process in an embodiment of the present invention. Figure 3 .

[0038] Figure label:

[0039] 1. CCM; 11. Catalyst layer;

[0040] 2. First border membrane; 21. First channel;

[0041] 3. Second border membrane; 31. Second channel;

[0042] 4. Hot melt adhesive;

[0043] 5. Pressure-sensitive adhesive;

[0044] 6. GDL. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0047] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0048] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0052] like Figure 1-5As shown, this embodiment provides a membrane electrode encapsulation process and a membrane electrode, which is encapsulated using this membrane electrode encapsulation process. The membrane electrode includes a CCM1, two first frame films 2, and two second frame films 3. The two first frame films 2 are respectively attached to both sides of the CCM1, and a first adhesive is provided between the first frame films 2 and the CCM1. The two second frame films 3 are respectively attached to the outer sides of the two first frame films 2, and a second adhesive is provided between the second frame films 3 and their corresponding first frame films 2. It can be understood that in actual production, the first adhesive is disposed on the first frame films 2, and the second adhesive is disposed on the second frame films 3.

[0053] In the prior art, for membrane electrodes encapsulated with four-layer border films, the adhesive layers of the four border films are all hot melt adhesives, that is, the first adhesive and the second adhesive are both hot melt adhesives, and the hot melt adhesives are cured by hot pressing. Since the four-layer border films are relatively thick, the problem of adhesive overflow is prone to occur when encapsulating with one hot pressing, which affects the performance of the membrane electrode.

[0054] To address the aforementioned issues, in this embodiment, the membrane electrode uses a first adhesive configured to bond the first frame film 2 to the CCM1 via hot pressing; and a second adhesive configured to bond the second frame film 3 to the corresponding first frame film 2 via cold pressing. Since no heating is required when bonding the second frame film 3, it does not affect the first adhesive, effectively preventing adhesive overflow during four-layer frame film encapsulation and thus improving the performance of the membrane electrode.

[0055] In addition, among the membrane electrodes of the four-layer frame film, there is also a configuration in which the inner frame film is directly covered on the surface of CCM1, but the inner frame film is not bonded to CCM1. Compared with this configuration, the first frame film 2 of this embodiment is bonded to CCM1, resulting in higher physical strength.

[0056] For example, the first adhesive is hot melt adhesive 4; the second adhesive is pressure-sensitive adhesive 5. It should be noted that during encapsulation, the first frame film 2 is a finished film with hot melt adhesive 4 attached, and the second frame film 3 is a finished film with pressure-sensitive adhesive 5 attached. In other words, the hot melt adhesive 4 and pressure-sensitive adhesive 5 are solid at this time. Compared with the encapsulation method of applying liquid adhesive to the frame film during press-fitting, on the one hand, it is easier to control the thickness of the adhesive and meet the strict tolerance requirements of the membrane electrode; on the other hand, the adhesive has higher stability before bonding, which facilitates the storage and encapsulation operation of the first frame film 2 and the second frame film 3.

[0057] In this embodiment, the first frame film 2 located in the inner layer is hot-pressed and the second frame film 3 located in the outer layer is cold-pressed. The process is more reasonable. Compared with the process of using UV adhesive and curing the UV adhesive with UV light to bond CCM1 to the frame film and the inner and outer frame films, the process will not cause damage to CCM1 and the frame film due to light exposure.

[0058] Optionally, the membrane electrode also includes two GDL (Gas Diffusion Layer) layers 6. In the prior art, the two GDL layers are directly bonded to the outer sides of the two second frame membranes, resulting in poor flatness of the membrane electrode.

[0059] To address this issue, in this embodiment, the first frame film 2 has a first channel 21 corresponding to the active region of the CCM1, and the second frame film 3 has a second channel 31 corresponding to the active region of the CCM1. The cross-sectional area of ​​the second channel 31 is larger than that of the first channel 21, and the second channel 31 is correspondingly positioned to the first channel 21, with its cross-section perpendicular to the flow direction of the channel. Two layers of GDL6 are respectively located within the second channels 31 of the two second frame films 3, and the GDL6 is adhered to the outer side of the corresponding first frame film 2 and covers the first channel 21 using a second adhesive. Without affecting the performance of the GDL6, the above arrangement allows the second frame film 3 to compensate for the thickness of the GDL6, resulting in a flatter membrane electrode.

[0060] In the prior art, the commonly used GDL6 thickness is 110μm-320μm. Further, based on the above-described configuration of the first channel 21 and the second channel 31, the membrane electrode in this embodiment uses a second border film 3 with a thickness of 70μm-180μm. The thickness of the second border film 3 can be any value among 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, and 180μm. This allows for further compensation of the GDL6 thickness to improve the flatness of the membrane electrode, which is beneficial for improving its performance.

[0061] It should be noted that GDL6 also uses a second adhesive to bond with the corresponding first frame film 2. The second adhesive can bond GDL6 to the corresponding first frame film 2 through cold pressing. No heating is required when bonding GDL6, which will not affect the first adhesive between the first frame film 2 and CCM1 or the second adhesive between the second frame film 3 and the first frame film 2. This effectively avoids the problem of adhesive overflow during four-layer frame film encapsulation and helps to improve the performance of the membrane electrode.

[0062] Optionally, the minimum overlap width d between GDL6 and the first frame film 2 is 1mm-5mm. The minimum overlap width d between GDL6 and the first frame film 2 can be any value among 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm. In other words, the cross-section of the second channel 31 has the same shape as the cross-section of the first channel 21 and is correspondingly arranged. The length of one side of the cross-section of the first channel 21 is a, and the length of the corresponding side of the cross-section of the second channel 31 is a`. Then a` - a = 2d, meaning a` is 2mm-10mm longer than a.

[0063] Preferably, 2mm < d ≤ 5mm. The larger the overlap width between GDL6 and the first frame film 2, the larger the design margin, which can reduce production precision, thereby reducing fixed investment and lowering costs. Of course, the minimum overlap width d between GDL6 and the first frame film 2 can also be set to: 1mm ≤ d ≤ 2mm, to ensure the bonding strength between GDL6 and the first frame film 2 and prevent GDL6 from falling off.

[0064] Optionally, the cross-section of the second channel 31 completely covers the cross-section of the first channel 21, so that the GDL6 can be bonded to the corresponding first frame film 2 on all four sides, ensuring the stability of the GDL6. In this embodiment, the second channel 31 and the first channel 21 are arranged opposite each other, so that the overlap width between any two opposite sides of the GDL6 and the corresponding first frame film 2 is equal, which can make the GDL6 bond firmly to the first frame film 2 and have high stability.

[0065] For example, multiple catalyst layers 11 are provided on both sides of CCM1 at intervals, and the area of ​​each catalyst layer 11 is 250 cm². 2 -350cm 2 Of course, CCM1 can also be provided with continuous catalyst layers 11. After the two first frame films 2 are attached to both sides of CCM1, the portion of the catalyst layer 11 exposed in the first channel 21 is generally referred to as the active region. In other words, each catalyst layer 11 can form an active region, and the active region is located at the center of the catalyst layer 11. In this embodiment, the first frame film 2 is provided with first channels 21 corresponding one-to-one with the active regions on one side of CCM1, and the second frame film 3 is provided with second channels 31 corresponding one-to-one with the active regions on one side of CCM1. When the second frame film 3 is attached to the corresponding first frame film 2, the second channels 31 are corresponding one-to-one with the first channels 21. It should be noted that in this embodiment, all descriptions of the second channels 31 and the first channels 21 are actually mutually corresponding second channels 31 and first channels 21.

[0066] like Figure 1As shown, this embodiment also provides a membrane electrode encapsulation process for encapsulating the above-mentioned membrane electrode, including the following steps:

[0067] S1. The two layers of first frame film 2 are bonded to both sides of CCM1 by hot pressing with a first adhesive.

[0068] S2. The two layers of second frame film 3 are cold-pressed and bonded to the outside of the two layers of first frame film 2 respectively using a second adhesive.

[0069] The first frame film 2, located on the inner layer, is first bonded to both sides of the CCM1 using hot pressing. Then, the second frame film 3, located on the outer layer, is bonded to the outside of the two first frame films 2 using cold pressing. In other words, the first adhesive can bond the first frame film 2 to the CCM1 using hot pressing, and the second adhesive can bond the second frame film 3 to the corresponding first frame film 2 using cold pressing. No heating is required when bonding the second frame film 3, so it will not affect the first adhesive. This effectively avoids the problem of adhesive overflow during the four-layer frame film encapsulation and is beneficial to improving the performance of the membrane electrode. In addition, the first frame film 2 and CCM1 are bonded to each other in this embodiment, resulting in higher physical strength.

[0070] Figure 2 This is a detailed flowchart of the membrane electrode packaging process provided in the embodiments of the present invention. The following is a detailed flowchart in conjunction with... Figures 2 to 5 The membrane electrode packaging process provided in this embodiment will be described in detail.

[0071] S10. Cut the first border film 2 to cut out the first channel 21 corresponding to the active area of ​​CCM1.

[0072] The cross-sectional area of ​​the first channel 21 can be determined based on the area of ​​the active region. In this embodiment, the first frame film 2 is provided with a first channel 21 that corresponds one-to-one with the active region on one side of the CCM1.

[0073] S20, such as Figure 3 As shown, two layers of first frame film 2 are bonded to both sides of (three-layer) CCM1 by hot pressing with a first adhesive to form a five-layer film electrode.

[0074] Optionally, the first adhesive is hot melt adhesive 4. It should be noted that during encapsulation, the first frame film 2 is a finished film with hot melt adhesive 4 attached. In other words, the hot melt adhesive 4 is solid at this time. Compared with the encapsulation method of applying liquid adhesive to the frame film during press-fitting, it is easier to control the thickness of the first adhesive and meet the strict tolerance requirements of the membrane electrode. On the other hand, the first adhesive has higher stability before bonding, which facilitates the storage and encapsulation operation of the first frame film 2.

[0075] For example, the pressure for hot pressing is 20 kg / cm². 2 -50kg / cm 2 The temperature is 110℃-140℃, and the time is 2min-6min. The pressure, temperature and time of hot pressing can be selected and set according to specific needs. As long as the first frame film 2 and CCM1 can be bonded together without causing the first adhesive to overflow, it will not affect the performance of the membrane electrode.

[0076] For hot pressing, steel strip hot roller pressing, two hot rollers pressing against each other, or two hot plates pressing against each other can be used. Of course, other hot pressing methods can also be used, as long as the purpose of pressing and heating can be achieved. No restrictions are imposed here.

[0077] S30. Cut the second border film 3 to cut out the second channel 31 corresponding to the active area of ​​CCM1; the cross-sectional area of ​​the second channel 31 is larger than the cross-sectional area of ​​the first channel 21, and the cross-section is a section perpendicular to the flow direction of the channel.

[0078] The cross-sectional area of ​​the second channel 31 can be determined based on the cross-sectional area of ​​the first channel 21. In this embodiment, the second frame film 3 is provided with second channels 31 that correspond one-to-one with the active areas on one side of CCM1.

[0079] S40, such as Figure 4 As shown, two layers of second frame film 3 are bonded to the outside of two layers of first frame film 2 by cold pressing with a second adhesive, and the second channel 31 is arranged to correspond with the first channel 21 to form a seven-layer film electrode.

[0080] The first frame film 2, located on the inner layer, is hot-pressed, while the second frame film 3, located on the outer layer, is cold-pressed, resulting in a more efficient process. Compared to the existing technology that uses a single hot-pressing process to bond four frame films, this effectively avoids adhesive overflow issues and improves the performance of the membrane electrode. Furthermore, compared to the process of using UV adhesive and curing it with UV light to bond CCM1 to the frame film and the inner and outer frame films, this method prevents damage to CCM1 and the frame film from light exposure.

[0081] Optionally, the second adhesive is pressure-sensitive adhesive 5. It should be noted that during encapsulation, the second frame film 3 is a finished film with pressure-sensitive adhesive 5 attached. In other words, the pressure-sensitive adhesive 5 is solid at this time. Compared with the encapsulation method of applying liquid adhesive to the frame film during pressing, it is easier to control the thickness of the second adhesive and meet the strict tolerance requirements of the membrane electrode. On the other hand, the second adhesive has higher stability before bonding, which facilitates the storage and encapsulation operation of the second frame film 3.

[0082] For example, the pressure for cold pressing is 20 kg / cm². 2 -50kg / cm2 The time is 2-6 minutes. The pressure and time of cold pressing can be selected and set according to specific needs, as long as the second frame film 3 can be bonded to the corresponding first frame film 2.

[0083] Cold pressing may cause a small number of air bubbles to form between the second frame film 3 and the first frame film 2. Optionally, under vacuum conditions, cold pressing can be used to bond the two layers of the second frame film 3 to the outer sides of the two layers of the first frame film 2 using a second adhesive. For example, step S40 can be completed in a vacuum environment, which is beneficial for removing air bubbles.

[0084] After step S40 is completed, the active area can be cut out into flow channels and outer contours using blade slicing, die cutting, or laser cutting.

[0085] S50, such as Figure 5 As shown, two layers of GDL6 are placed in the second channels 31 of the two second frame films 3 respectively, and the two layers of GDL6 are bonded to the outside of the two first frame films 2 respectively by cold pressing and covering the corresponding first channels 21 through the second adhesive, thus forming a nine-layer film electrode (including four frame films).

[0086] GDL6 also uses a second adhesive to bond with the corresponding first frame film 2. The second adhesive can bond GDL6 to the corresponding first frame film 2 by cold pressing. No heating is required when bonding GDL6, which will not affect the first adhesive between the first frame film 2 and CCM1 or the second adhesive between the second frame film 3 and the first frame film 2. This can effectively avoid the problem of adhesive overflow when encapsulating four-layer frame films, and is beneficial to improving the performance of the membrane electrode.

[0087] When bonding the second frame film 3, the cross-section of the second channel 31 is controlled to completely cover the cross-section of the first channel 21, so that the GDL6 can be bonded to the corresponding first frame film 2 on all four sides, ensuring the stability of the GDL6. In this embodiment, the second channel 31 and the first channel 21 are arranged opposite each other, so that the overlap width between any two opposite sides of the GDL6 and the corresponding first frame film 2 is equal, which can make the GDL6 bond firmly to the first frame film 2 and have high stability.

[0088] When cutting the second frame film 3, the cross-sectional area of ​​the second channel 31 is made larger than that of the first channel 21, so that GDL6 can be placed in the second channel 31 and attached to the outside of the first frame film 2. The thickness of GDL6 can be compensated by the second frame film 3, so that the film electrode is flatter.

[0089] In this embodiment, the cross-section of the second channel 31 has the same shape as the cross-section of the first channel 21 and is correspondingly arranged. The length of one side of the cross-section of the first channel 21 is 'a', and the length of the corresponding side of the cross-section of the second channel 31 is 'a'. When cutting the second frame film 3, a' is controlled to be 2mm-10mm longer than a. This arrangement ensures that the minimum overlap width 'd' between GDL6 and the first frame film 2 is 1mm-5mm. When 1mm ≤ d ≤ 2mm, the bonding strength between GDL6 and the first frame film 2 is guaranteed, preventing GDL6 from detaching. When 2mm < d ≤ 5mm, the minimum overlap width between GDL6 and the first frame film 2 is increased. A larger overlap width between GDL6 and the frame film allows for a larger design margin, reducing production precision and thus reducing fixed investment and costs.

[0090] In the prior art, the commonly used GDL6 thickness is 110μm-320μm. Furthermore, in this embodiment, the membrane electrode uses a second frame membrane 3 with a thickness of 70μm-180μm. This allows for further compensation of the GDL6 thickness, improving the flatness of the membrane electrode and thus enhancing its performance.

[0091] For cold pressing, a vacuum platform plus roller pressing, two vacuum platforms pressing against each other, or two rollers pressing against each other can be used. Of course, other pressing methods can also be used, as long as pressing can be achieved without heating. No restrictions are imposed here.

[0092] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A membrane electrode assembly process, characterized by, Includes the following steps: The two layers of first frame film (2) are bonded to both sides of CCM (1) by hot pressing with a first adhesive. Under vacuum conditions, the two layers of second frame film (3) are cold-pressed together with a second adhesive and attached to the outside of the two layers of first frame film (2).

2. The membrane electrode packaging process according to claim 1, characterized in that, Before hot-pressing the two layers of the first frame film (2) onto both sides of the CCM (1) using the first adhesive, the process further includes: Cut the first border film (2) to cut out the first channel (21) corresponding to the active area of ​​the CCM (1); Before cold-pressing the two layers of second frame film (3) onto the outer sides of the two layers of first frame film (2) using a second adhesive, the process further includes: Cut the second border film (3) to cut out the second channel (31) corresponding to the active area of ​​the CCM (1); the cross-sectional area of ​​the second channel (31) is larger than the cross-sectional area of ​​the first channel (21), and the cross-section is a cross-section perpendicular to the flow direction of the channel; While cold-pressing the two layers of second frame film (3) onto the outer sides of the two layers of first frame film (2) using a second adhesive, the process also includes: The second channel (31) is configured to correspond to the first channel (21).

3. The membrane electrode packaging process according to claim 2, characterized in that, After cold-pressing the two layers of second frame film (3) onto the outer sides of the two layers of first frame film (2) using a second adhesive, the process further includes: Two layers of GDL (6) are placed in the second channel (31) of the two layers of the second frame film (3), and the two layers of GDL (6) are bonded to the outside of the two layers of the first frame film (2) by cold pressing and covering the corresponding first channel (21) with the second adhesive.

4. The membrane electrode packaging process according to claim 3, characterized in that, The minimum overlap width between the GDL (6) and the first frame film (2) is 1mm-5mm.

5. The membrane electrode packaging process according to claim 3, characterized in that, The thickness of the second border film (3) is 70μm-180μm.

6. The membrane electrode encapsulation process according to claim 1, characterized in that, The first adhesive is a hot melt adhesive (4); The second adhesive is a pressure-sensitive adhesive (5).

7. A membrane electrode, packaged using the membrane electrode packaging process as described in any one of claims 1-6, characterized in that, include: CCM(1); Two first frame films (2) are attached to both sides of the CCM (1) respectively, and a first adhesive is provided between the first frame films (2) and the CCM (1). The first adhesive is configured to bond the first frame films (2) and the CCM (1) by hot pressing. Two second frame films (3) are attached to the outside of two first frame films (2) respectively, and a second adhesive is provided between the second frame film (3) and the corresponding first frame film (2). The second adhesive is configured to bond the second frame film (3) to the corresponding first frame film (2) by cold pressing.

8. The membrane electrode according to claim 7, characterized in that, The first frame film (2) is provided with a first channel (21) corresponding to the active area of ​​the CCM (1), and the second frame film (3) is provided with a second channel (31) corresponding to the active area of ​​the CCM (1); The cross-sectional area of ​​the second channel (31) is larger than that of the first channel (21), and the second channel (31) is arranged correspondingly to the first channel (21). The cross-section is a cross-section perpendicular to the flow direction of the channel. The membrane electrode also includes two layers of GDL (6), which are located in the second channel (31) of the two second frame films (3) respectively, and the GDL (6) is attached to the outside of the corresponding first frame film (2) and covers the first channel (21).

9. The membrane electrode according to claim 8, characterized in that, The GDL (6) is bonded to the corresponding first frame film (2) by the second adhesive.

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