PEM water electrolysis membrane electrode frame attaching structure

Abstract

The utility model relates to the technical field of water electrolysis hydrogen production, in particular to a PEM water electrolysis membrane electrode frame attaching structure which comprises a proton exchange membrane, a cathode catalyst layer and an anode catalyst layer are arranged on the upper side surface and the lower side surface of the proton exchange membrane respectively, and the proton exchange membrane is larger than the anode catalyst layer and the cathode catalyst layer in size. The proton exchange membrane, the anode catalyst layer and the cathode catalyst layer are arranged between the two frame adhesive membranes, the inner frame size of the frame adhesive membranes is smaller than the sizes of the anode catalyst layer and the cathode catalyst layer, and the outer frame size of the frame adhesive membranes is larger than the size of the proton exchange membrane; the edges of the proton exchange membrane, the anode catalyst layer and the cathode catalyst layer are located at the inner edges of the frame adhesive films, and the two frame adhesive films are attached into a whole face to face; according to the utility model, the problem that the utilization rate of the proton membrane of the existing PEM membrane electrode is too low is solved, the waste of the proton membrane caused by the size of the CCM and the frame is avoided, and the phenomenon of blowby of the cathode and the anode under extreme conditions is further avoided.

Description

[Technical field]

[0001] The utility model relates to the technical field of hydrogen production by electrolysis of water, in particular to a PEM water electrolysis membrane electrode frame bonding structure. [Background Technology]

[0002] At present, the main sealing and bonding methods of PEM membrane electrodes are: cutting the anode catalyst layer and the cathode catalyst layer, the frame adhesive film with an inner diameter slightly smaller than the size of the catalyst layer, and the proton membrane with the same length and width as the outer size of the frame, such as the attached Figure 1 As shown, the anode catalyst layer and the cathode catalyst layer are respectively transferred on both sides of the proton exchange membrane to prepare a CCM with a three-layer structure; then the frame is sealed, and the CCM is adsorbed on the tooling for frame bonding. The edge of the anode catalyst layer is slightly larger than the inner diameter of the anode frame and the edge of the cathode catalyst layer is slightly larger than the inner diameter of the cathode frame. After bonding, hot pressing is performed to form a membrane electrode.

[0003] This fitting structure results in a huge waste of proton membrane because the CCM is as large as the frame. [Contents of the utility model]

[0004] The purpose of the utility model is to solve the above-mentioned shortcomings and provide a PEM water electrolysis membrane electrode frame bonding structure, which solves the problem of low utilization rate of PEM membrane electrode proton membrane involved in the prior art and avoids the waste of proton membrane caused by the CCM being as large as the frame.

[0005] In order to achieve the above-mentioned purpose, a PEM water electrolysis membrane electrode frame bonding structure is designed, including a proton exchange membrane 3, wherein the upper and lower surfaces of the proton exchange membrane 3 are respectively provided with a cathode catalyst layer 2 and an anode catalyst layer 1, the size of the proton exchange membrane 3 is larger than the anode catalyst layer 1 and the cathode catalyst layer 2, the proton exchange membrane 3, the anode catalyst layer 1 and the cathode catalyst layer 2 are arranged between two frame adhesive films, the inner frame size of the frame adhesive film is smaller than the size of the anode catalyst layer 1 and the cathode catalyst layer 2, the outer frame size of the frame adhesive film is larger than the size of the proton exchange membrane 3, the edges of the proton exchange membrane 3, the anode catalyst layer 1 and the cathode catalyst layer 2 are located at the inner edge of the frame adhesive film, and the two frame adhesive films are face-to-face bonded as a whole.

[0006] Furthermore, the anode catalyst layer 1 and the cathode catalyst layer 2 have the same size, and there are spacings between the edges of the anode catalyst layer 1 and the cathode catalyst layer 2 and the edges of the proton exchange membrane 3 to form a U-shaped structure.

[0007] Furthermore, a circle of hot melt adhesive 6 is provided at the periphery of the proton exchange membrane 3, and the hot melt adhesive 6 is located in the gap 7 where the edge of the proton exchange membrane 3 and the frame adhesive film are attached, thereby avoiding leakage between the anode and cathode under extreme conditions.

[0008] Furthermore, the two frame adhesive films include a cathode frame 5 located on the upper side and an anode frame 4 located on the lower side, the edge of the anode catalyst layer 1 is fitted with the inner diameter edge of the anode frame 4, and the edge of the cathode catalyst layer 2 is fitted with the inner diameter edge of the cathode frame 5.

[0009] Furthermore, a cathode groove is provided at the inner diameter edge of the cathode frame 5, and an anode groove is provided at the inner diameter edge of the anode frame 4. The cathode groove and the anode groove are arranged symmetrically up and down, and the cathode catalyst layer 2 and the anode catalyst layer 1 are respectively embedded in the cathode groove and the anode groove.

[0010] Furthermore, a binder is provided in the cathode groove and the anode groove, and the cathode catalyst layer 2 and the anode catalyst layer 1 are respectively tightly adhered to the cathode catalyst layer 2 and the anode catalyst layer 1 through the binder.

[0011] Furthermore, the inner diameters of the cathode frame 5 and the anode frame 4 are connected to the proton exchange membrane 3, the anode catalyst layer 1, and the cathode catalyst layer 2 as a whole, and the outer diameters of the cathode frame 5 and the anode frame 4 are directly face-to-face and tightly fitted as a whole.

[0012] Furthermore, the adhesive type of the frame adhesive film is polyacrylate hot melt adhesive, so it has excellent initial adhesion and good lasting adhesion.

[0013] Compared with the prior art, the utility model solves the problem of low utilization rate of PEM membrane electrode proton membrane involved in the prior art, and avoids the waste of proton membrane caused by the CCM and the frame being equal and extremely large; in addition, since the PEM proton exchange membrane is usually thicker and the frame hot melt adhesive is thinner, a gap will be generated at the place where the edge of the proton membrane and the frame adhesive film are bonded, so that leakage will occur between the anode and the cathode under extreme conditions. In order to avoid leakage of the membrane electrode, the utility model dispenses glue near the edge of the proton membrane after the CCM anode active area is bonded to the anode frame, and after dispensing glue, the two pieces of frame adhesive films are bonded face to face, so that the gap at the edge of the membrane electrode proton membrane is filled. [Drawings]

[0014] Figure 1 This is a schematic diagram of the main sealing frame bonding method of the PEM membrane electrode before the improvement of the utility model;

[0015] Figure 2 It is a front structural schematic diagram of the utility model;

[0016] Figure 3 It is a schematic diagram of the top view structure of the utility model;

[0017] Figure 4 This is a schematic diagram of pre-lamination of one layer of the frame of the utility model;

[0018] Figure 5 This is a schematic diagram of glue dispensing of the utility model;

[0019] Figure 6 This is a schematic diagram of the pre-lamination of the second layer frame of the utility model;

[0020] Figure 7 It is a schematic diagram of the front structure of the further improved utility model;

[0021] Figure 8 It is a schematic diagram of a top view structure of a further improvement of the utility model;

[0022] In the figure: 1, anode catalyst layer 2, cathode catalyst layer 3, proton exchange membrane 4, anode frame 5, cathode frame 6, hot melt adhesive 7, gap 8, catalyst layer 2 9, proton exchange membrane 2 10, frame 2. [Specific implementation method]

[0023] The utility model is further described below in conjunction with the accompanying drawings:

[0024] As shown in the accompanying drawings, the utility model provides a PEM water electrolysis membrane electrode frame bonding structure, including a proton exchange membrane 3, wherein a cathode catalyst layer 2 and an anode catalyst layer 1 are respectively arranged on the upper and lower surfaces of the proton exchange membrane 3, the size of the proton exchange membrane 3 is larger than the anode catalyst layer 1 and the cathode catalyst layer 2, the proton exchange membrane 3, the anode catalyst layer 1 and the cathode catalyst layer 2 are arranged between two frame adhesive films, the inner frame size of the frame adhesive film is smaller than the size of the anode catalyst layer 1 and the cathode catalyst layer 2, the outer frame size of the frame adhesive film is larger than the size of the proton exchange membrane 3, the edges of the proton exchange membrane 3, the anode catalyst layer 1 and the cathode catalyst layer 2 are located at the inner edge of the frame adhesive film, and the two frame adhesive films are face-to-face bonded as a whole; a circle of hot melt adhesive 6 is arranged at the outer periphery of the proton exchange membrane 3, and the hot melt adhesive 6 is located in the gap 7 where the edge of the proton exchange membrane 3 and the frame adhesive film are bonded, thereby avoiding leakage of the anode and cathode under extreme conditions.

[0025] The anode catalyst layer 1 and the cathode catalyst layer 2 have the same size, and there is a gap between the edges of the anode catalyst layer 1 and the cathode catalyst layer 2 and the edges of the proton exchange membrane 3, forming a U-shaped structure. The two frame adhesive films include a cathode frame 5 located on the upper side and an anode frame 4 located on the lower side, the edge of the anode catalyst layer 1 is fitted with the inner diameter edge of the anode frame 4, and the edge of the cathode catalyst layer 2 is fitted with the inner diameter edge of the cathode frame 5; a cathode groove is provided at the inner diameter edge of the cathode frame 5, and an anode groove is provided at the inner diameter edge of the anode frame 4, the cathode groove and the anode groove are arranged symmetrically up and down, and the cathode catalyst layer 2 and the anode catalyst layer 1 are respectively embedded in the cathode groove and the anode groove.

[0026] In the PEM water electrolysis membrane electrode frame bonding structure, the glue type of the frame adhesive film is a polyacrylate hot melt adhesive with excellent initial adhesion and good sustained adhesion; an adhesive is provided in the cathode groove and the anode groove, and is tightly bonded to the cathode catalyst layer 2 and the anode catalyst layer 1 respectively through the adhesive; the inner diameters of the cathode frame 5 and the anode frame 4 are connected to the proton exchange membrane 3, the anode catalyst layer 1, and the cathode catalyst layer 2 as a whole, and the outer diameters of the cathode frame 5 and the anode frame 4 are directly face to face and tightly bonded as a whole.

[0027] The utility model also provides a PEM water electrolysis membrane electrode frame bonding method, comprising the following steps:

[0028] 1) cutting the anode catalyst layer 1 and the cathode catalyst layer 2, cutting the proton exchange membrane 3 whose size is larger than the anode catalyst layer 1 and the cathode catalyst layer 2 for transfer printing, cutting two pieces of frame adhesive film for backup, the inner frame size of the frame adhesive film is smaller than the size of the anode catalyst layer 1 and the cathode catalyst layer 2, the outer frame size of the frame adhesive film is larger than the size of the proton exchange membrane 3, and the adhesive type of the frame adhesive film is polyacrylate hot melt adhesive;

[0029] 2) transferring the anode catalyst layer 1 and the cathode catalyst layer 2 onto the upper and lower sides of the proton exchange membrane 3 to form a CCM;

[0030] 3) Seal the CCM by first fitting the edge of the anode catalyst layer 1 to the inner diameter edge of the anode frame 4, and then fitting the edge of the cathode catalyst layer 2 to the inner diameter edge of the cathode frame 5, and then hot pressing to form a membrane electrode.

[0031] In step 3), after the CCM anode active area is bonded to the anode frame 4, glue is dispensed near the edge of the proton exchange membrane 3, and then the two frame adhesive films are bonded face to face after glue dispensing, so as to avoid leakage between the anode and cathode under extreme conditions; preferably, after the frame is bonded on one side of the transferred CCM, a circle of hot melt adhesive 6 with a thickness of 0.1 mm is dispensed on the periphery of the proton exchange membrane 3, and then the two frame adhesive films are bonded face to face, so as to further improve the reliability of avoiding leakage; and when the two frame adhesive films are bonded face to face, they are first hot pressed at 70°C and 2Mpa to allow the hot melt adhesive 6 to initially solidify, and then hot pressed at 150°C and 4Mpa to obtain a PEM membrane electrode after bonding and sealing.

[0032] When the utility model is implemented, the anode catalyst layer and the cathode catalyst layer, the frame adhesive film with an inner diameter slightly smaller than the catalyst layer, and the proton membrane slightly larger than the CCF are first cut for use; the anode catalyst layer and the cathode catalyst layer are transferred to the proton membrane to form a CCM, and the CCM is subjected to a frame sealing process, the edge of the anode catalyst layer is bonded to the inner diameter edge of the anode frame, and then the edge of the cathode catalyst layer is bonded to the inner diameter edge of the cathode frame, and after bonding, hot pressing is performed to form a membrane electrode, such as attached Figure 2 and attached Figure 3 Since PEM proton exchange membrane is usually thicker and the frame hot melt adhesive is thinner, there will be a gap where the edge of the proton membrane and the frame adhesive film are attached. Under extreme conditions, leakage will occur between the anode and cathode. In order to avoid leakage of membrane electrode, a dispensing process is introduced during the frame bonding process, such as the attached Figure 4 To Attachment Figure 6 The specific operation is as follows: After the CCM anode active area is bonded to the anode frame, a glue dispensing process is performed near the edge of the proton membrane. After the glue dispensing, the two frame adhesive films are bonded face to face. First, they are hot-pressed at 70℃-2Mpa for 60s to allow the hot melt adhesive to initially solidify. Then, they are hot-pressed at 150℃-4Mpa to obtain the PEM membrane electrode after bonding and sealing. The gap at the edge of the membrane electrode proton membrane obtained using this scheme is filled, as shown in the attached figure. Figure 7 and attached Figure 8 .

[0033] In order to better illustrate the purpose, technical solution and advantages of the utility model, the fitting structure of the utility model will be further described below through specific embodiments:

[0034] Example 1

[0035] Cut the anode catalyst layer and cathode catalyst layer of 210mm*210mm in size and the proton membrane of 220mm*220mm with a thickness of 117um for transfer. Cut two pieces of PEM battery frames with an outer size of 320mm×320mm, an inner frame size of 200mm*200mm, and a type of adhesive of polyacrylate hot melt adhesive for backup. The frame is bonded on one side of the CCM after transfer. After bonding, a circle of hot melt adhesive with a thickness of 0.1mm is applied to the periphery of the proton membrane. Then, the two pieces of frame adhesive film are bonded face to face, and hot pressed at 70℃-2Mpa for 60s to make the hot melt adhesive initially solidify, and then hot pressed at 150℃-4Mpa for 300s to obtain the PEM membrane electrode structure after bonding and sealing. Compared with the case where the size of the proton membrane is the same as the outer size of the frame, the utilization rate of the proton membrane is increased from 45% to 90%. The SEM cross-sectional image of the junction between the proton membrane of the membrane electrode and the frame was scanned, and no gaps were found.

[0036] Example 2

[0037] Cut the anode catalyst layer and cathode catalyst layer of 210mm*210mm in size and the proton membrane of 220mm*220mm with a thickness of 80um for transfer. Cut two pieces of PEM battery frames with an outer size of 320mm×320mm, an inner frame size of 200mm*200mm, and a type of adhesive of polyacrylate hot melt adhesive for backup. The frame is bonded on one side of the CCM after transfer. After bonding, a circle of hot melt adhesive with a thickness of 0.1mm is applied to the periphery of the proton membrane. Then, the two pieces of frame adhesive film are bonded face to face, and hot pressed at 70℃-2Mpa for 60s to make the hot melt adhesive initially solidify, and then hot pressed at 150℃-4Mpa for 300s to obtain the PEM membrane electrode structure after bonding and sealing. Compared with the case where the size of the proton membrane is the same as the outer size of the frame, the utilization rate of the proton membrane is increased from 45% to 90%. The SEM cross-sectional image of the junction between the proton membrane of the membrane electrode and the frame was scanned, and no gaps were found.

[0038] Example 3

[0039] Cut the anode catalyst layer and cathode catalyst layer of 210mm*210mm in size, and the proton membrane of 220mm*220mm with a thickness of 50um for standby use. Cut two pieces of PEM battery frames with an outer size of 320mm×320mm, an inner frame size of 200mm*200mm, and a type of adhesive of polyacrylate hot melt adhesive for standby use. The frame is bonded on one side of the CCM after transfer, and after bonding, a circle of hot melt adhesive with a thickness of 0.1mm is applied to the periphery of the proton membrane. Then, the two pieces of frame adhesive film are bonded face to face, and hot pressed at 70℃-2Mpa for 60s to make the hot melt adhesive initially solidify, and then hot pressed at 150℃-4Mpa for 300s to obtain the PEM membrane electrode structure after bonding and sealing. Compared with the case where the size of the proton membrane is the same as the outer size of the frame, the utilization rate of the proton membrane is increased from 45% to 90%. The SEM cross-sectional image of the junction between the proton membrane of the membrane electrode and the frame was scanned, and no gaps were found.

[0040] The components of the utility model are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel in this field through technical manuals or through conventional experimental methods. The problem solved by the utility model is the problem of low utilization rate of PEM membrane electrode. The utility model improves the utilization rate of proton membrane by combining the above components and changing the sealing frame method.

[0041] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

[0042] The present invention is not limited to the above-mentioned implementation modes, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be considered as equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A PEM water electrolysis membrane electrode frame bonding structure, characterized in that: The invention comprises a proton exchange membrane (3), wherein the upper and lower surfaces of the proton exchange membrane (3) are respectively provided with a cathode catalyst layer (2) and an anode catalyst layer (1), the size of the proton exchange membrane (3) is larger than the anode catalyst layer (1) and the cathode catalyst layer (2), the proton exchange membrane (3), the anode catalyst layer (1) and the cathode catalyst layer (2), the proton exchange membrane (3), the anode catalyst layer (1) and the cathode catalyst layer (2) are arranged between two frame adhesive films, the inner frame size of the frame adhesive film is smaller than the size of the anode catalyst layer (1) and the cathode catalyst layer (2), the outer frame size of the frame adhesive film is larger than the size of the proton exchange membrane (3), the edges of the proton exchange membrane (3), the anode catalyst layer (1) and the cathode catalyst layer (2) are located at the inner edge of the frame adhesive film, and the two frame adhesive films are face-to-face bonded as a whole.

2. The PEM water electrolysis membrane electrode frame bonding structure according to claim 1, characterized in that: The anode catalyst layer (1) and the cathode catalyst layer (2) have the same size, and there is a gap between the edges of the anode catalyst layer (1) and the cathode catalyst layer (2) and the edges of the proton exchange membrane (3), forming a U-shaped structure.

3. The PEM water electrolysis membrane electrode frame bonding structure according to claim 1, characterized in that: A circle of hot melt adhesive (6) is provided at the periphery of the proton exchange membrane (3), and the hot melt adhesive (6) is located in a gap (7) where the edge of the proton exchange membrane (3) and the frame adhesive film are attached.

4. The PEM water electrolysis membrane electrode frame bonding structure according to claim 1, characterized in that: The two frame adhesive films include a cathode frame (5) located on the upper side and an anode frame (4) located on the lower side, the edge of the anode catalyst layer (1) is fitted with the inner diameter edge of the anode frame (4), and the edge of the cathode catalyst layer (2) is fitted with the inner diameter edge of the cathode frame (5).

5. The PEM water electrolysis membrane electrode frame bonding structure according to claim 4, characterized in that: A cathode groove is provided at the inner diameter edge of the cathode frame (5), and an anode groove is provided at the inner diameter edge of the anode frame (4). The cathode groove and the anode groove are arranged symmetrically up and down, and the cathode catalyst layer (2) and the anode catalyst layer (1) are respectively embedded in the cathode groove and the anode groove.

6. The PEM water electrolysis membrane electrode frame bonding structure according to claim 5, characterized in that: The cathode groove and the anode groove are provided with an adhesive, and are respectively tightly adhered to the cathode catalyst layer (2) and the anode catalyst layer (1) through the adhesive.

7. The PEM water electrolysis membrane electrode frame bonding structure according to claim 4, characterized in that: The inner diameters of the cathode frame (5) and the anode frame (4) are connected to the proton exchange membrane (3), the anode catalyst layer (1), and the cathode catalyst layer (2) as a whole, and the outer diameters of the cathode frame (5) and the anode frame (4) are directly face-to-face and tightly fitted as a whole.

8. The PEM water electrolysis membrane electrode frame bonding structure according to claim 1, characterized in that: The adhesive type of the frame adhesive film is polyacrylate hot melt adhesive.

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