Fuel cell single cell packaging structure

Abstract

The utility model discloses a fuel cell single cell packaging structure relates to fuel cell technical field, including membrane electrode, the both sides of membrane electrode are equipped with inner border respectively, the outside of two inner border all is equipped with outer border, the outside of two outer border is equipped with anode plate and cathode plate respectively, two outer border all is equipped with channel, be equipped with hot melt adhesive film layer in the channel. Through pasting a layer of outer border on the outside of inner border again, then through the slotting of outer border, hot melt adhesive film layer is bonded to outer border and pole plate, through the layered setting of inner border and outer border, has improved the mechanical strength and the sealing property of packaging structure, facilitates the implementation of hot -pressing technology and assembly simultaneously, need not to the slotting of pole plate, and the process is simpler, improves the strength of whole single cell simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, specifically to a fuel cell single-cell packaging structure. Background Technology

[0002] The encapsulation of a single fuel cell needs to balance sealing performance, thermal stability, and assembly efficiency. In existing technologies, fuel cell single-cell encapsulation typically involves using hot melt adhesive to bond the frame to both sides of the membrane electrode assembly (MEA), then creating grooves in the electrode plates, with the frame and plates sealed using adhesive layers within the grooves. Grooving the electrode plates reduces strength, and adhesive overflow during sealing can easily occur, affecting the cell's conductivity and leading to a deterioration in the sealing effect. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a fuel cell single cell packaging structure with good conductivity and sealing effect, which addresses the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A fuel cell single cell packaging structure includes a membrane electrode assembly (MEA). The MEA has inner frame edges on both sides, and outer frame edges on the outer sides of both inner frame edges. An anode plate and a cathode plate are respectively provided on the outer sides of both outer frame edges. Both outer frame edges have channels, and a hot melt adhesive film layer is provided in the channels.

[0006] As an improved technical solution, the inner frame includes a first thin film layer and a first hot melt adhesive layer arranged sequentially, and the edges of the film electrode are respectively abutted against the upper and lower first hot melt adhesive layers.

[0007] As an improved technical solution, the outer frame includes a second thin film layer and a second hot melt adhesive layer disposed sequentially, with the second hot melt adhesive layer disposed between the first thin film layer and the second thin film layer.

[0008] As an improved technical solution, the channel penetrates through the outer frame, and the thickness of the hot melt adhesive film layer before it is hot-pressed and bonded to the inner frame is 5-10 μm greater than the thickness of the outer frame.

[0009] As an improved technical solution, the width of the channel is 4-6mm, and the width of the hot melt adhesive film layer after die-cutting is 1-2mm smaller than the width of the channel.

[0010] As an improved technical solution, the thickness of the first thin film layer is 15-50 μm, and the thickness of the first hot melt adhesive layer is 15-30 μm.

[0011] As a preferred technical solution, the thickness of the second thin film layer is 15-45μm, and the thickness of the second hot melt adhesive layer is 15-30μm.

[0012] As a preferred technical solution, a first release film is provided on the outer side of the first hot melt adhesive layer.

[0013] As a preferred technical solution, a second release film is provided on the outer side of the second hot melt adhesive layer, and a protective film layer is provided on the outer side of the second film layer. The channel is die-cut through the second release film, the second hot melt adhesive layer and the second film layer. The depth of the channel embedded in the protective film layer accounts for 1 / 3 to 1 / 2 of the thickness of the protective film layer.

[0014] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0015] This invention discloses a fuel cell single-cell encapsulation structure, including a membrane electrode assembly (MEA). The MEA has inner frame borders on both sides, and outer frame borders on the outer sides of each inner frame. An anode plate and a cathode plate are respectively located on the outer sides of each outer frame. Each outer frame has a channel, and a hot-melt adhesive film layer is disposed within the channel. By attaching an additional outer frame border to the outer side of the inner frame, and then punching grooves in the outer frame borders, the hot-melt adhesive film layer bonds the outer frame borders and the electrode plates. This layered arrangement of inner and outer frame borders improves the mechanical strength and sealing performance of the encapsulation structure. It also facilitates assembly and hot-pressing processes, eliminating the need for punching grooves in the electrode plates, simplifying the process, and increasing the overall strength of the single cell.

[0016] The inner frame of this invention includes a first thin film layer and a first hot melt adhesive layer arranged sequentially, with the edges of the membrane electrode abutting against the upper and lower first hot melt adhesive layers respectively. The combination of the first thin film layer and the first hot melt adhesive layer enhances the flexibility and adhesive strength of the inner frame, ensuring a stable seal at the edges of the membrane electrode.

[0017] The outer frame includes a second thin film layer and a second hot melt adhesive layer disposed sequentially between the first thin film layer and the second thin film layer. The design of the second thin film layer and the second hot melt adhesive layer improves the heat resistance and adhesion reliability of the outer frame, while optimizing the bonding effect with the inner frame.

[0018] The channel penetrates the outer frame. Before being hot-pressed and bonded to the inner frame, the thickness of the hot melt adhesive film layer is 5-10 μm greater than the thickness of the outer frame. The channel penetrating the outer frame facilitates the filling and hot-pressing bonding of the hot melt adhesive film layer. The 5-10 μm thickness of the hot melt adhesive film layer compared to the outer frame ensures that the channel is fully filled after hot pressing and a reliable sealing interface is formed, improving the hermeticity and structural stability of the encapsulation.

[0019] The width of the channel is 4-6mm, and the width of the hot melt adhesive film layer after die-cutting is 1-2mm smaller than the width of the channel. The channel width of 4-6mm and the slightly narrower hot melt adhesive film layer prevent adhesive overflow during hot pressing, ensuring neat packaging and sealing effect.

[0020] The thickness of the first thin film layer is 15-50 μm, and the thickness of the first hot melt adhesive layer is 15-30 μm. A thickness of 20-45 μm balances mechanical strength and flexibility, ensuring the inner frame does not deform during hot pressing. A thickness of 15-30 μm provides sufficient adhesive material while avoiding uneven hot pressing caused by excessive thickness.

[0021] The second thin film layer has a thickness of 15-45 μm, and the second hot melt adhesive layer has a thickness of 15-30 μm. A thickness of 20-45 μm enhances the support and pressure resistance of the outer frame, improving overall encapsulation durability. A thickness of 15-30 μm optimizes the adhesion of the outer frame, ensuring a strong bond with the anode / cathode plate.

[0022] A first release film is provided on the outer side of the first hot melt adhesive layer. Before use, the first release film is used to protect the first hot melt adhesive layer from contamination or to pre-bond it, facilitating storage and pre-assembly processing.

[0023] A second release film is provided on the outer side of the second hot melt adhesive layer, and a protective film layer is provided on the outer side of the second thin film layer. The groove is die-cut through the second release film, the second hot melt adhesive layer, and the second thin film layer. The groove is embedded in the protective film layer to a depth of 1 / 3 to 1 / 2 of the thickness of the protective film layer. Before use, the copper drum is covered with the second release film to protect the hot melt adhesive layer. After punching, the protective film layer does not penetrate, providing support for the second release film, the second hot melt adhesive layer, and the second thin film layer, and also preventing damage to the outer frame. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a cross-sectional view of an embodiment of the present utility model;

[0026] Figure 2 This is a cross-sectional view from another direction of an embodiment of the present utility model;

[0027] Figure 3 This is an exploded view of an embodiment of the present utility model;

[0028] Figure 4 yes Figure 1 A cross-sectional view of the outer and middle borders;

[0029] Figure 5 yes Figure 1Exploded view of the inner and outer borders;

[0030] Figure 6 yes Figure 1 A cross-sectional view of the inner border;

[0031] Figure 7 yes Figure 1 Exploded view of the inner border;

[0032] The components are: 1. Membrane electrode; 2. Inner frame; 3. Outer frame; 4. Anode plate; 5. Cathode plate; 6. Channel; 7. Hot melt adhesive film layer; 8. First thin film layer; 9. First hot melt adhesive layer; 10. Second thin film layer; 11. Second hot melt adhesive layer; 12. First release film; 13. Second release film; 14. Protective film layer. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] like Figure 1-7 As shown, a fuel cell single-cell encapsulation structure includes a membrane electrode assembly (MEA) 1. Inner frame frames 2 are provided on both sides of the MEA 1, and outer frame frames 3 are provided on the outer sides of each inner frame frame 2. An anode plate 4 and a cathode plate 5 are respectively provided on the outer sides of each outer frame frame 3. Each outer frame frame 3 has a channel 6, and a hot melt adhesive film layer 7 is disposed within the channel 6. By attaching another outer frame frame 3 to the outer side of the inner frame frame 2, and then punching grooves in the outer frame frame 3, the hot melt adhesive film layer 7 bonds the outer frame frame 3 to the electrode plates. This layered arrangement of inner frame frames 2 and outer frame frames 3 improves the mechanical strength and sealing performance of the encapsulation structure. It also facilitates assembly and hot-pressing processes, eliminating the need for punching grooves in the electrode plates, simplifying the process, and increasing the overall strength of the single cell.

[0035] The inner frame 2 includes a first thin film layer 8 and a first hot melt adhesive layer 9 arranged sequentially. The edges of the membrane electrode 1 are respectively abutted against the upper and lower first hot melt adhesive layers 9. The combination of the first thin film layer 8 and the first hot melt adhesive layer 9 enhances the flexibility and adhesive strength of the inner frame 2, ensuring a stable seal at the edges of the membrane electrode 1. In this embodiment, the first thin film layer 8 is a PEN film.

[0036] The outer frame 3 includes a second film layer 10 and a second hot melt adhesive layer 11 disposed sequentially, with the second hot melt adhesive layer 11 located between the first film layer 8 and the second film layer 10. The design of the second film layer 10 and the second hot melt adhesive layer 11 improves the heat resistance and bonding reliability of the outer frame 3, while optimizing the adhesion effect with the inner frame 2. In this embodiment, the second film layer 10 is a PEN film.

[0037] The channel 6 penetrates the outer frame 3. The thickness of the hot melt adhesive film layer 7 before hot pressing and bonding with the inner frame 2 is 8-10 μm greater than the thickness of the outer frame 3. The channel 6 penetrating the outer frame 3 facilitates the filling and hot pressing and bonding of the hot melt adhesive film layer 7. The hot melt adhesive film layer 7 is 8-10 μm thicker than the outer frame 3, ensuring that the channel 6 is fully filled after hot pressing and a reliable sealing interface is formed, thereby improving the hermeticity and structural stability of the encapsulation.

[0038] The width of the channel 6 is 4-6mm, and the width of the hot melt adhesive film layer 7 after die-cutting is 1-2mm smaller than the width of the channel 6. The channel 6 is 4-6mm wide, and the hot melt adhesive film layer 7 is slightly narrower to avoid adhesive overflow during hot pressing, ensuring neat packaging and sealing effect.

[0039] The thickness of the first thin film layer 8 is 15-50 μm, and the thickness of the first hot melt adhesive layer 9 is 15-30 μm. The thickness of 15-45 μm balances mechanical strength and flexibility, ensuring that the inner frame 2 does not deform during hot pressing. The thickness of 15-30 μm provides sufficient adhesive material while avoiding uneven hot pressing caused by excessive thickness.

[0040] The second thin film layer 10 has a thickness of 15-45 μm, and the second hot melt adhesive layer 11 has a thickness of 15-30 μm. The 15-45 μm thickness enhances the support and pressure resistance of the outer frame 3, improving overall encapsulation durability. The 15-30 μm thickness optimizes the adhesion performance of the outer frame 3, ensuring a strong bond with the anode plate 4 / cathode plate 5.

[0041] A first release film 12 is provided on the outer side of the first hot melt adhesive layer 9. Before use, the first hot melt adhesive layer 9 is protected from contamination or pre-bonded by covering it with the first release film 12, which facilitates storage and pre-assembly processing.

[0042] A second release film 13 is provided on the outer side of the second hot melt adhesive layer 11, and a protective film layer 14 is provided on the outer side of the second thin film layer 10. The groove 6 penetrates the second release film 13, the second hot melt adhesive layer 11, and the second thin film layer 10 during die cutting. The depth to which the groove 6 is embedded in the protective film layer 14 is 1 / 3 to 1 / 2 of the thickness of the protective film layer 14. Before use, the copper drum covers the second release film 13 to protect the hot melt adhesive layer. After punching, the protective film layer 14 does not penetrate, providing support for the second release film 13, the second hot melt adhesive layer 11, and the second thin film layer 10, and also preventing damage to the outer frame 3.

[0043] The working principle of this utility model:

[0044] 1. Membrane electrode encapsulation: Remove the first release film 12 of the inner frame 2, then place the membrane electrode 1 between the two PEN first thin film layers 8, and bond the first hot melt adhesive layer 9 together. Hot press at 120℃ and 0.6Mpa for 30 seconds to encapsulate the membrane electrode 1.

[0045] 2. Outer frame die-cutting: Laser die-cutting technology is used to reserve a groove 6 in the outer frame 3. The groove 6 penetrates the second release film 13, the second hot melt adhesive layer 11 and the second thin film layer 10 during die-cutting. The depth of the groove 6 embedded in the protective film layer 14 is 1 / 3 to 1 / 2 of the thickness of the protective film layer 14, and the accuracy is controlled within ±0.05mm.

[0046] 3. Hot pressing of outer frame: After removing the second release film 13, align the die-cut outer frame 3 with the inner frame, and bond the second hot melt adhesive layer 11 with the first thin film layer 8. Hot press at 140℃ and 0.8MPa for 60 seconds to fuse the edge of the PEN outer frame 3 with the edge of the inner frame 2 of the membrane electrode 1.

[0047] 4. Hot melt adhesive film layer bonding of electrode plates: The two hot melt adhesive film layers 7 are hot-pressed with the corresponding cathode plate 5 and anode plate 4 at 130℃ and 1MPa for 45 seconds to form a pre-bonded layer.

[0048] 5. Overall assembly: Remove the protective film layer 14, align the electrode plate after bonding the hot melt adhesive film layer 7 with the groove 6 of the outer frame 3, and hot press at 150℃ and 1MPa for 30 seconds to achieve three-dimensional sealing.

[0049] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A fuel cell single-cell packaging structure, comprising a membrane electrode assembly (MEA), wherein inner frames are respectively provided on both sides of the MEA, characterized in that: Both inner frames are provided with outer frames on their outer sides, and an anode plate and a cathode plate are provided on the outer sides of the two outer frames respectively. Both outer frames are provided with channels, and a hot melt adhesive film layer is provided in the channels.

2. The fuel cell single-cell packaging structure as described in claim 1, characterized in that: The inner frame includes a first thin film layer and a first hot melt adhesive layer arranged sequentially, and the edges of the membrane electrode are respectively abutted against the upper and lower first hot melt adhesive layers.

3. The fuel cell single-cell packaging structure as described in claim 2, characterized in that: The outer frame includes a second thin film layer and a second hot melt adhesive layer disposed sequentially, with the second hot melt adhesive layer located between the first thin film layer and the second thin film layer.

4. The fuel cell single-cell packaging structure as described in claim 1, characterized in that: The channel penetrates the outer frame, and the thickness of the hot melt adhesive film layer before it is hot-pressed and bonded to the inner frame is 5-10 μm greater than the thickness of the outer frame.

5. The fuel cell single-cell packaging structure as described in claim 1, characterized in that: The width of the channel is 4-6mm, and the width of the hot melt adhesive film layer after die-cutting is 1-2mm smaller than the width of the channel.

6. The fuel cell single-cell packaging structure as described in claim 2, characterized in that: The thickness of the first thin film layer is 15-50 μm, and the thickness of the first hot melt adhesive layer is 15-30 μm.

7. The fuel cell single-cell packaging structure as described in claim 3, characterized in that: The thickness of the second thin film layer is 15-45 μm, and the thickness of the second hot melt adhesive layer is 15-30 μm.

8. The fuel cell single-cell packaging structure as described in claim 2, characterized in that: A first release film is provided on the outer side of the first hot melt adhesive layer.

9. The fuel cell single-cell packaging structure as described in claim 3, characterized in that: A second release film is provided on the outer side of the second hot melt adhesive layer, and a protective film layer is provided on the outer side of the second thin film layer. The groove is die-cut through the second release film, the second hot melt adhesive layer and the second thin film layer. The depth of the groove embedded in the protective film layer is 1 / 3 to 1 / 2 of the thickness of the protective film layer.

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