WO2022116912A1

WO2022116912A1 - Fuel cell membrane electrode sealing assembly, encapsulation process, and device for continuous encapsulation

Info

Publication number: WO2022116912A1
Application number: PCT/CN2021/133543
Authority: WO
Inventors: 张洪杰; 郝金凯; 邵志刚
Original assignee: 中国科学院大连化学物理研究所
Priority date: 2020-12-03
Filing date: 2021-11-26
Publication date: 2022-06-09
Also published as: CN112531183A; CN112531183B

Abstract

Disclosed is a fuel cell membrane electrode sealing assembly. The area of each diffusion layer of the fuel cell membrane electrode sealing assembly is larger than that of a through slot on each sealing frame, and position-limiting through holes are formed on a catalytic electrode layer and the sealing frames, such that preliminary position-limiting by laminating five components layer by layer is achieved. Also disclosed is an encapsulation process for the membrane electrode sealing assembly. Continuous transport of the membrane electrode sealing assembly is achieved by using a fixture, and a welding encapsulation process is combined, such that the defects in the prior art of dislocation, loosening and the like caused in the process of transporting the membrane electrode sealing assembly using the conventional hot press encapsulation technique are mitigated. Also disclosed is a device for continuous encapsulation, comprising an assembly line, a welding line, and a cooling line for the membrane electrode sealing assembly, which are all implemented in one step in a conveying process by a conveyor belt so as to achieve continuous encapsulation of a membrane electrode, thereby solving the problem that existing membrane electrode sealing assemblies cannot be encapsulated continuously.

Description

Fuel cell membrane electrode sealing assembly, packaging process and equipment for continuous packaging

technical field

The invention relates to the field of fuel cells, in particular to a fuel cell membrane electrode sealing assembly, a packaging process and equipment for continuous packaging.

Background technique

At present, the development of the fuel cell industry is uneven. There is a certain distance between my country and developed countries in terms of technical level and production level. The model and size of fuel cell stacks cannot be unified. On this basis, the membrane electrodes processed and produced by related companies or research institutions are generally characterized by complex sizes, small quantities, and most of them need to be customized exclusively. Therefore, some designs for large-scale and standardized production cannot be well implemented.

Membrane electrode assemblies, namely MEA (Membrane Electrode Assemblies) are the core components of hydrogen fuel cells, which are composed of the catalytic electrode layer of the hydrogen fuel cell and the gas diffusion layers on both sides of the catalytic electrode layer. In the prior art, the hydrogen fuel cell membrane electrode assembly is formed by hot pressing the catalytic electrode layer and the gas diffusion layers on both sides of the catalytic electrode layer, and the effect of hot pressing directly affects the yield of the membrane electrode assembly, among which When the membrane electrode assembly is hot pressed, the generated bubbles and wrinkles have the most serious impact on the membrane electrode assembly.

At present, the common situation of membrane electrode sealing components is manual production by operators, that is, workers seal the cut proton exchange membrane into the sealing protection frame when assembling membrane electrodes. Generally, a sandwich type packaging method is used, that is, the proton exchange membrane is sealed. Inside the two-layer sealed protective frame.

Patent CN103887519A discloses a membrane electrode pressing mold and its operation method. The mold has through holes and grooves on the upper and lower positioning plates to locate the gas diffusion layer and the membrane electrode, but the membrane electrode with a frame is easily twisted and deformed, and cannot be laid flat in the groove, resulting in displacement during pressing.

Patent CN106785071A provides a thermal recombination process for battery cells. The first separator, the first electrode, the second separator and the second electrode are stacked layer by layer from bottom to top in order; Hot pressing to form a hot pressing unit.

In the existing hot pressing forming process for the production of membrane electrodes for fuel cells, there are problems of poor hot pressing quality and low hot pressing precision. Among them, most of the existing hot pressing operations are one-time molding, which is prone to uneven pressure or excessive pressure, and the glue is prone to sticking during the curing process; and it cannot ensure that the parts to be hot pressed are easy to pick and place. At the same time, there will be no deviation during the hot pressing process, and the flat hot pressing of the membrane electrode assembly by using the upper and lower platens to stick white cardboard cannot guarantee the complete removal of air bubbles in the membrane electrode assembly. Morphology of the membrane electrode assembly during flat and hot pressing.

SUMMARY OF THE INVENTION

One of the objectives of the present invention is to provide a fuel cell membrane electrode sealing assembly, which can improve the structure of the membrane electrode sealing assembly, and can realize the preliminary limit between the layers of the membrane electrode sealing assembly, which is convenient for overall transportation; Another object of the present invention is to provide a packaging process for a fuel cell membrane electrode sealing assembly, which has the characteristics of continuous packaging, has higher work efficiency, and can achieve better sealing properties; another object of the present invention is to provide a fuel cell membrane electrode The equipment for continuous packaging of sealing components can realize the overall transportation of membrane electrode sealing components, and the membrane electrode sealing components that complete the limit can realize continuous transportation and continuous packaging under this equipment.

Above-mentioned technical purpose of the present invention is achieved through the following technical solutions:

First, the present invention provides a fuel cell membrane electrode sealing assembly, comprising a membrane electrode composed of a catalytic electrode layer and a diffusion layer respectively placed on both sides of the catalytic electrode layer, and the two diffusion layers are respectively placed outside the non-coated surfaces, The two sealing frames that seal the membrane electrode, that is, the membrane electrode sealing assembly is the first sealing frame, the first diffusion layer, the catalytic electrode layer, the second diffusion layer and the second sealing frame from bottom to top. ;

The sealing frame is provided with a through slot for exposing the non-coated surface of the diffusion layer, and the area of the diffusion layer is larger than the area of the through slot, specifically, the first sealing frame and the second sealing frame. A through slot is provided at the middle position of the first sheet of diffusion layer, the catalytic electrode layer and the second sheet of diffusion layer are placed concentrically with the through slot; the first sheet of diffusion layer and the second sheet of diffusion layer The area is larger than the area of the through slot;

The catalytic electrode layer and the sealing frame are provided with a plurality of position-corresponding and coaxial limit through holes near the corner ends. Refers to the catalytic electrode layer, the first sealing frame, and the second sealing frame are provided with a plurality of position limit through holes corresponding to each other and coaxial; on the first sealing frame, and The side in contact with the first diffusion layer and the side on the second sealing frame and in contact with the second diffusion layer are coated with an adhesive surface layer.

In the present invention, the distance between the outer edge of the diffusion layer and the edge of the through slot is both 1-2 mm.

In another aspect, the present invention provides a process for encapsulating a fuel cell membrane electrode sealing assembly, wherein the membrane electrode sealing assembly is positioned in a fixture, the fixture includes a support plate, and four corner ends of the support plate are distributed near the support plate. The positioning column, the process includes the following steps:

S1, using the limited through-hole structure, place the first sealing frame in the fixture with the adhesive layer facing upward, and then cover the non-coated surface of the first diffusion layer on the positive side of the adhesive surface layer of the first sealing frame the middle;

S2, using the limited through-hole structure, the catalytic electrode layer is placed in the fixture and covered on the coating surface of the first diffusion layer;

S3, cover the coating surface of the second diffusion layer on the center of the catalytic electrode layer, and then use the limited through-hole structure again to cover the glue surface layer of the second sealing frame on the non-coated surface of the second diffusion layer. On the cladding surface, the superposition and limit of the five are completed to form a membrane electrode sealing assembly;

S4, the membrane electrode sealing assembly is welded by the laser welding process, and the welding head is welded along the outer peripheral end of the diffusion layer 3-5mm to form a circle of pre-welded seams;

S5, using the ultrasonic linear scanning welding process to perform scanning ultrasonic welding on the superimposed position of the diffusion layer and the sealing frame in the membrane electrode sealing assembly completed in S4 to form the first sealing area at the diffusion layer;

S6, continue to use the ultrasonic linear scanning welding process to perform the second scanning ultrasonic welding on the area between the area 1 and the area 2 in the membrane electrode sealing assembly completed in S5 to form a second sealing area; After the limit through holes are connected in a straight line, the area in the closed circle formed, the second area is the first sealing area;

S7, the membrane electrode sealing assembly completed in S6 is subjected to cold-setting treatment to complete the encapsulation of the membrane electrode sealing assembly.

One side of the diffusion layer is coated with slurry, which is the coating surface, and the coating surface of the diffusion layer is in direct contact with the coating surface of the catalytic electrode.

The present invention is further set as follows: in the S5 and S6 ultrasonic linear scanning welding processes, the pressure of the welding head on the membrane electrode sealing assembly is both 0.05-0.2MPa, and the vibration frequency is 15-40kHz.

The present invention is further set as follows: in the S4 laser welding process, the laser power parameter is 0.1-0.3W.

The present invention is further configured as follows: in the S4-S6 laser welding process and the ultrasonic linear scanning welding process, the welding process is carried out under nitrogen protection, the nitrogen output flow is 15-30L/min, and the pressure is 0.2-0.5Mpa.

The present invention further provides that: in the cold-setting treatment in S7, cooling water is used to cool the membrane electrode sealing assembly, and the water temperature of the cooling water is 10-20°C.

In yet another aspect, the present invention provides a continuous packaging equipment for a fuel cell membrane electrode packaging process, comprising a rack body and a Plc system, the rack body is provided with a conveying mechanism, and a feeding end of the conveying mechanism is provided along the conveying mechanism. In the conveying direction to the discharge end, there are successively arranged the overlapping limit area of the membrane electrode sealing assembly, the welding area of the membrane electrode sealing assembly, and the rolling cold-setting area that acts on the membrane electrode sealing assembly;

The superimposed limit area of the membrane electrode sealing assembly includes two sets of limit mechanisms for auxiliary placement of the diffusion layer for realizing precise placement of the diffusion layer;

The welding area of the membrane electrode sealing assembly includes laser welding equipment for welding the membrane electrode sealing assembly, ultrasonic linear scanning welding equipment, and protective gas introduction mechanisms distributed on both sides of the conveyor belt in the conveying direction.

The present invention is further provided that: the ultrasonic linear scanning welding equipment is sequentially provided with a welding head group 1 for welding the first sealing area and a welding head group 2 for welding the second sealing area along the conveying direction of the conveyor belt. The first group includes a rectangular welding head 1 and a square welding head disposed at both ends of the rectangular welding head, and the welding head group 2 includes a rectangular welding head The second welding head, the strip-shaped welding head can move up and down along the two square welding heads.

The present invention is further provided that: one end of the square welding head 1 is provided with a first sensor and a second sensor respectively on both sides along the thickness direction for identifying the diffusion layer and controlling the operation of the welding head group 1, and the first sensor reaches the length of the welding head. The straight-line distance of the bar-shaped welding head 1 and the straight-line distance from the second sensor to the long-shaped welding head 1 are all equal to the width of the first sealing area; the square welding head 2 is provided with a third sensor, and the fixture is far from Four receivers connected to the signal of the third sensor are arranged at the membrane electrode assembly and in an array along its length direction; the laser welding equipment includes a laser welding head, and the laser welding head is located at the front station of the laser welding head along the conveying direction of the conveyor belt where the first sensor, the second sensor, the third sensor, the fourth sensor and the receiver constitute the identification sensor control component, and the identification sensor control component is all signal-connected to the plc system circuit.

To sum up, the present invention has the following beneficial effects:

1. The present invention discloses a membrane electrode sealing assembly. The area of the diffusion layer in the membrane electrode sealing assembly is larger than the area of the through notch in the sealing frame, so that a layer-by-layer stacking method can be adopted, and the glue on the sealing frame can be matched. The surface layer can realize the preliminary positioning of the five elements as a whole. During this process, the limit through holes on the sealing frame and the catalytic electrode layer realize the five elements superposition process. The position between the layers is initially limited, which is conducive to the later transportation. and packaging process;

2. The present invention also discloses an encapsulation process of the membrane electrode sealing assembly. A fixture with a positioning column is provided. Under the premise of not requiring the complicated process of sticking tape, the membrane electrode sealing assembly can not be accurately produced in actual packaging production. The problem of positioning and production saves the assembly time and workload of the membrane electrode sealing assembly; at the same time, the welding packaging process is adopted, and the membrane electrode sealing assembly with the clamp can be directly transported and packaged, which solves the common hot pressing packaging technology in the prior art. In the process of transportation of the membrane electrode sealing assembly, the dislocation and looseness of the membrane electrode sealing assembly occur, which affects the effect of hot-pressing packaging. At the same time, in this process, laser welding is used to fix the initial welding line of the membrane electrode sealing assembly at a distance from the diffusion layer. Since the sealing effect of laser welding is far greater than that of heat sealing, pre-welding greatly improves the sealing effect of the electrode, which can strengthen the positioning effect of the membrane electrode sealing assembly on the fixture, avoid the deviation of the diffusion layer, and then use ultrasonic linear scanning welding. The scanning surface contact welding of the MEA is completed, and at the same time the sealing of the membrane electrode sealing assembly is completed, there will be no phenomena such as bubbles and wrinkles that affect its performance, and it has a better packaging effect;

3. In the ultrasonic linear scanning welding process of the membrane electrode sealing assembly, two sets of welding heads are used to separately weld the first sealing area and the second sealing area, so as to avoid the extrusion phenomenon of the diffusion layer during one-time ultrasonic scanning. At the same time, it also avoids the damage of the diffusion layer caused by multiple sealing extrusions where the diffusion layer and the sealing frame overlap;

4. The present invention also discloses a continuous packaging equipment for the membrane electrode sealing assembly of the fuel cell, including the assembly line, welding line and cooling line of the membrane electrode sealing assembly, all of which are completed in one step during the conveying process of the conveyor belt, so as to realize the membrane electrode sealing assembly. continuous packaging, which solves the problem that the existing membrane electrode sealing components cannot be continuously packaged;

5. The equipment for continuous encapsulation adopts special welding heads for welding the first sealing area and the second sealing area of the membrane electrode sealing assembly, which can realize the precise welding of the membrane electrode sealing assembly, and combine the identification sensor to control the assembly to realize welding. Smart automation work in the district.

Description of drawings

FIG. 1 is a schematic structural diagram of a membrane electrode sealing assembly;

Fig. 2 is the overall structure schematic diagram of continuous encapsulation equipment;

Fig. 3 is a partial enlarged view of A in Fig. 2;

FIG. 4 is also a schematic diagram of the overall structure of the equipment for continuous packaging, and is also a schematic diagram of an air outlet long pipe, a grating sensor, and a position sensor;

5 is a schematic structural diagram of a connection auxiliary positioning mechanism located in the frame body and between two layers of conveyor belts;

6 is a schematic view of the membrane electrode sealing assembly being placed in a fixture and being laser welded;

7 is a schematic diagram of the membrane electrode sealing assembly being placed in a fixture to perform ultrasonic linear scanning welding on the first sealing area;

FIG. 8 is a partial enlarged view of the linear distance from the first sensor and the second sensor to the elongated welding head 1 and the width of the first sealing area, respectively;

FIG. 9 is a schematic diagram of the ultrasonic linear scanning welding performed on the second sealing area by placing the membrane electrode sealing assembly in a fixture.

In the figure: 1. Membrane electrode sealing assembly; 1-1, sealing frame; 1-1-1, through slot; 1-1-2, glue surface layer; 1-2, catalytic electrode layer; 1-2-1 , catalyst layer; 1-3, diffusion layer; 1-4, limit through hole; 2, clamp; 2-1, support plate; 2-2, positioning column; 2-3, receiver; 3, rack body ;3-1. Electric lift door;4.Conveyor belt;5.Limiting mechanism for auxiliary placement of diffusion layer;5-1.Connecting plate;5-2.Locating plate;5-3.Half-frame through slot;5-4 , Limit notch; 5-5, Extension wall; 5-6, Cylinder two; 5-7, Position sensor; 6, Rolling cold-setting area; 6-1, Rotating flexible floating roller; 6-2, Water pipe; 6-3, cooling water tank; 7, laser welding head; 7-1, fourth sensor; 8, welding head group one; 8-1, long welding head one; 8-2, square welding head one; 8- 3. The first sensor; 8-4, the second sensor; 9, the welding head group 2; 9-1, the elongated welding head 2; 9-2, the square welding head 2; 9-3, the third sensor; 10 , Connect the auxiliary positioning mechanism (located inside the conveyor belt in the welding area); 10-1, electromagnetic support seat; 10-2, motor one; 10-3, motor two; 10-4, slide bar; 10-5, slider; 10 -6, screw; 11, air outlet long pipe; 11-1, connecting air pipe; 12, position adjustment mechanism; 12-1, grating sensor; 12-2, infrared beam; 12-3, cylinder one; 12-4, adjustment Push plate; 13. Fixture storage table; 14. Pre-welded seam; 15. First sealing area; 16. Second sealing area.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings.

A fuel cell membrane electrode sealing assembly 1, comprising a catalytic electrode layer 1-2 formed after coating a catalyst layer 1-2-1 on both sides of a proton exchange membrane, and two catalyst layers respectively placed on the two catalyst layers 1-2-1. The diffusion layer 1-3, the catalytic electrode layer 1-2 and the two diffusion layers 1-3 constitute the core component of the fuel cell - the membrane electrode.

In this sealing assembly, sealing frames 1-1 made of PEN material with high melting point and high barrier properties are respectively covered on both sides of the membrane electrode, and the center of the sealing frame 1-1 is provided with a diffusion layer 1-1 3. The through slot 1-1-1 where the non-coated surface is exposed. In this membrane electrode sealing assembly 1, the area of the through slot 1-1-1 is smaller than the area of the diffusion layer 1-3. The distance between the peripheral end and the edge end of the through slot 1-1-1 is both 1-2mm, specifically 1mm in this embodiment, so that when the sealing frame 1-1 covers the diffusion layer 1-3, the The coverage of the diffusion layer 1-3 is limited, and the catalytic electrode layer 1-2 and the sealing frame 1-1 are provided with four corresponding and coaxial limit through holes 1-4 at the positions near the four corner ends. In order to achieve a fixed positional relationship between the catalytic electrode layer 1-2 and the sealing frame 1-1, the positional relationship between the layers of the membrane electrode sealing assembly 1 is fixed, and the side of the sealing frame 1-1 in contact with the membrane electrode is also fixed. Both are coated with adhesive surface layer 1-1-2 with melting point below 100°C, such as thermal adhesive.

As shown in Figure 1, the membrane electrode sealing assembly 1 is, from bottom to top, the first sealing frame 1-1, which is placed on the first sealing frame 1-1 and placed concentrically with the through slot 1-1-1 The diffusion layer 1-3, the catalytic electrode layer 1-2, the second diffusion layer 1-3 and the second sealing frame 1-1 placed at the center of the catalytic electrode layer 1-2, the two sealing frames 1- The glue surface layer 1-1-2 between 1 can realize the preliminary limit when the five are combined.

A continuous encapsulation device for a membrane electrode sealing assembly of a fuel cell includes a rack body 3 and a Plc system. The plc system is provided with a timing program module; as shown in Figures 2 and 4, the rack body 3 is provided with a transmission mechanism, Along the conveying direction from the feed end to the discharge end of the conveying mechanism, the membrane electrode sealing assembly stacking limit area, the welding area of the membrane electrode sealing assembly 1, the rolling cold setting area 6 acting on the membrane electrode sealing assembly 1, and The clamp storage table 13 is located between the discharge end of the welding area of the membrane electrode sealing assembly 1 and the rolling and cooling area 6 .

The superposition limit area of the membrane electrode sealing assembly includes a plurality of sets of limit mechanisms 5 for auxiliary placement of the diffusion layers to achieve precise placement of the diffusion layers 1-3, and a position adjustment mechanism 12 to control the transfer area of the fixture 2. In this embodiment, the diffusion layer There are two sets of limit mechanisms 5 for auxiliary placement.

The welding area of the membrane electrode sealing assembly 1 includes laser welding equipment for welding the membrane electrode sealing assembly 1 , ultrasonic linear scanning welding equipment, a connection auxiliary positioning mechanism 10 for welding the fixture 2 in transit, and the membrane electrode sealing assembly 1 . The identification sensor control assembly that recognizes the orientation and is connected with the plc system circuit signal, and then controls the laser welding equipment, the ultrasonic linear scanning welding equipment, and connects the working sequence of the auxiliary positioning mechanism 10. There is also a welding area of the membrane electrode sealing assembly 1. Protective gas inlet mechanism.

The specific settings of the above mechanisms, equipment and components are as follows:

The conveying mechanism mainly includes the conveying belt 4 arranged on the frame body 3 and the driving motor for realizing the conveying of the conveying belt 4. The two ends of the conveying belt 4 are the feeding end and the discharging end respectively, as shown in Figure 2 or 4.

The limiting mechanism 5 for auxiliary placement of the diffusion layer, as shown in Fig. 2-4, includes connecting plates 5-1 which are rotatably arranged on the frame body 3 and placed on both sides of the conveyor belt 4 along the conveying direction. There is a second cylinder 5-6 hinged with the surface of the connecting plate 5-1, that is, the connecting plate 5-1 is turned over by the control of the second cylinder 5-6, and the bottoms of the two connecting plates 5-1 are provided with a device that can interfere with the clamp 2. The positioning plate 5-2, the distance between the bottom of the positioning plate 5-2 and the surface of the conveyor belt 4 is 1.5cm, to avoid the direct contact between the positioning plate 5-2 and the conveyor belt 4 to cause both wear; the top of the connecting plate 5-1 is provided with There is a half-frame through slot 5-3. When the two connecting plates 5-1 are parallel to the conveyor belt 4, the two half-frame through slots 5-3 together form a limit gap 5-4 for the diffusion layer 1-3 to pass through. , and when the diffusion layer passes through, the horizontal distance between the inner wall periphery of the limiting notch 5-4 and the outer periphery of the diffusion layer 1-3 is 0.3mm, so that the diffusion layer 1-3 can pass smoothly, and the upper edge of the connecting plate 5-1 The inner peripheral wall of the limiting notch 5-4 is provided with an extension wall 5-5 extending in the direction close to the conveyor belt 4, so as to realize the falling support effect on the diffusion layer 1-3 passing through the limiting notch 5-4, extending The distance between the bottom of the wall 5-5 and the upper end surface of the positioning column 2-2 of the fixture 2 is 1cm, so as to avoid conflict with the transmission of the fixture 2, so that it cannot be located directly below the limit notch 5-4; when the connecting plate 5-1 When parallel to the conveyor belt 4, the distance between the upper end surface of the connecting plate 5-1 and the upper end surface of the fixture 2 is 3 cm, that is, the overall falling distance of the diffusion layer 1-3 is 3 cm, and the smaller falling distance ensures that the diffusion layer 1-3 falls quickly. At the same time, on the frame body 3 along the conveying direction of the conveyor belt 4, at the front station of the connecting plate 5-1, there are paired clamps 2. The identified position sensor 5-7, the position sensor 5-7, and the second cylinder 5-6 are all connected with the plc system circuit signal.

During the transmission process of the fixture 2, after it is recognized by the position sensor 5-7, the recognition signal is transmitted to the plc system, and the plc system provides a preset program to obtain an instruction to realize the cylinder 2 adjacent to the position sensor 5-7. 5- 6, the two connecting plates 5-1 are turned over to be parallel to the conveyor belt 4, the clamp 2 and the positioning plate 5-2 stop moving forward after the collision, and the sealing frame 1-1 of one of the membrane electrode sealing assemblies 1 is carried on it. At the same position as the limit gap 5-4, the staff can drop the diffusion layer 1-3 from the limit gap 5-4, so that the diffusion layer 1-3 can smoothly cover the sealing frame 1- 1, after the PLC system program command 5S, the second cylinder 5-6 drives the connecting plate 5-1 to turn over and away from the conveyor belt 4, and the clamp 2 continues to move forward under the action of the conveyor belt 4.

The position adjustment mechanism 12, as shown in Figures 2 and 4, includes a grating sensor 12-1 disposed on the surface of the conveyor belt 4 and located between the feed end of the conveyor belt 4 and the welding area of the membrane electrode sealing assembly 1. Two parallel infrared beams 12-2 are emitted, and a limit area acting on the fixture 2 is formed between the two infrared beams 12-2; the frame body 3 is located on both sides of the feeding end of the conveyor The adjusting push plate 12-4 driven by the cylinder one 12-3, parallel to the infrared beam 12-2, and pushing the fixture 2; the cylinder one 12-3 and the grating sensor 12-1 are all connected with the plc system circuit signal.

Through the two parallel infrared beams 12-2, the staff try to place the fixture 2 in the limit area between the infrared beams 12-2. The infrared beams 12-2 overlap. At this time, the grating sensor 12-1 transmits the signal to the plc system. The plc system controls the operation of the cylinder one 12-3 through program instructions to realize the telescopic movement of the adjustment push plate 12-4 and adjust the push plate 12. The expansion and contraction process of -4 conflicts with the clamp 2, until the clamp 2 is completely pushed into the limit area, the cylinder 12-3 stops working; thus ensuring that the clamp 2 is strictly in the limit area at the feeding end, and is kept in the limit area. At the same time, the plc system can also be connected to an alarm connected to the circuit signal of the grating sensor 12-1. During the continuous transmission of the fixture 2, if there is a deviation from the limit area and the infrared beam 12-2 When the coincidence occurs, the alarm will give a warning, and the staff can make corrections in time.

Laser welding equipment, as shown in Figures 4 and 6, adopts plastic laser welding equipment that can realize micro-power adjustment on the market, mainly including laser welding head 7 and a drive table that controls the movement of the laser welding head 7 in the X/Y/Z axis direction (Fig. At the same time, along the conveying direction of the conveyor belt 4, the laser welding equipment is provided with a fourth sensor 7-1 connected with the signal of the plc system circuit at the front station of the laser welding head 7 to sense the sealing of the membrane electrode. The exposed diffusion layer 1-3 in the component 1, the sensing means of the diffusion layer 1-3 can be obtained by adjusting the distance between the fourth sensor 7-1 and the diffusion layer 1-3 to obtain the distance value range and input it into the plc program; when the fixture 2 After being transferred to the welding area of the membrane electrode sealing assembly 1, the fourth sensor 7-1 senses the diffusion layer 1-3, and the plc system instructs the laser welding head 7 to realize the distance between the diffusion layer 1-3 in the membrane electrode sealing assembly 1 according to the program path. The size range set at the outer peripheral end forms a pre-welded seam 14. In this embodiment, the welding power of the laser welding head 7 is set to 0.1W, and the welding temperature can reach 300°C.

Ultrasonic linear scanning welding equipment, as shown in Figures 4 and 7 and 8, in the present invention, the ultrasonic linear scanning welding equipment mainly includes two groups of welding heads for welding the membrane electrode sealing assembly 1, respectively for the size of the membrane electrode sealing assembly 1 Welding head group one 8 and welding head group two 9 are customized to realize complete welding of the first sealing area and the second sealing area. The square welding head 1 8-2 at both ends of the shaped welding head 1 8-1, the welding head group 9 includes the rectangular welding head 2 9-1 and the square welding head 2 disposed at both ends of the rectangular welding head 9-1 9-2. The ultrasonic linear scanning welding equipment is also equipped with an X-Y-Z drive table that controls the movement of the welding head group 1 8 and the welding head group 2 9X/Y/Z directions respectively. At the same time, the elongated welding head 1 8-1 can be set separately The small X-Y-Z drive table makes it move up and down independently along the two square welding heads 1 8-2. Similarly, the long strip welding head 2 9-1 can also be made along the two square welding heads 2 9-2. Up and down sliding movement; in this embodiment, the surface of the welding head in contact with the membrane electrode sealing assembly to be welded can be set as an arc surface, so that it is in line-to-surface contact when it contacts the membrane electrode sealing assembly to be welded, thereby While ensuring the smooth ultrasonic welding of the membrane electrode sealing assembly, the relative friction between the two is reduced.

At the same time, the elongated welding head 8-1 is provided with a first sensor 8-3 and a second sensor 8-4 for identifying the diffusion layer 1-3 and controlling the operation of the welding head group one 8 respectively along both sides of its thickness. , the distance between the first sensor 8-3 and the second sensor 8-4 can be adjusted. The sum of the distances from 8-4 to the elongated welding head 8-1 is equal to the width of the first sealing area 15. As shown in Figure 8, the distances between 15L and 8-3L and 8-4L are equal; the square welding head The second sensor 9-2 is provided with a third sensor 9-3, and four sensors 9-3 and the third sensor 9-3 are arranged in an array along the length direction of the side edge of the upper surface of the support plate 2-1 and away from the membrane electrode assembly along the length direction. The signal-connected receiver 2-3 is shown in Figure 9; both the first sensor 8-3 and the second sensor 8-4 can use distance sensors, and the diffusion in the membrane electrodes of the multilayer structure can be determined by debugging before the device is used. The distance between the layer and the signal receiver in the sensor to know the "coming" and "going" signals of the diffusion layer.

The first sensor 8-3, the second sensor 8-4, the third sensor 9-3, the fourth sensor 7-1 and the receiver 2-3 in the laser welding equipment constitute an identification sensor control component, and the identification sensor control component is The plc system circuit signal is connected, and the welding movement is controlled by the program writing in the plc system.

In the welding process of the membrane electrode sealing assembly 1 by the ultrasonic linear scanning welding equipment, the pressure of the welding head to the membrane electrode sealing assembly 1 is controlled to be 0.1MPa, the vibration frequency is 25kHz, and the temperature is about 200°C, so as to melt the sealing frame 1-1 The inner glue surface layer 1-1-2, and under the action of this pressure, the encapsulation of the membrane electrode sealing assembly 1 is realized.

The connection auxiliary positioning mechanism 10 is arranged inside the conveyor belt and is located at the welding area of the membrane electrode sealing assembly (the conveyor belt 4 includes a transmission loop composed of an upper conveyor belt and a lower transmission belt, and the connection auxiliary positioning mechanism is located at the upper conveyor belt and the welding area of the membrane electrode sealing assembly 1 at the welding area. between the lower transmission belts), as shown in FIG. 5 , the connection auxiliary positioning mechanism 10 includes two sliding rods 10-4 that are parallel to each other and are controlled and rotated by two motors 10-2 respectively. A sliding block 10-5 is slidably connected, and one end of the sliding block 10-5 away from the sliding rod 10-4 is fixedly connected with an electromagnetic support seat 10-1 that adsorbs the clamp 2, and the two electromagnetic support seats 10-1 are opposite to each other. The two electromagnetic support bases 10-1 are respectively screwed on two screw rods 10-6 parallel to the sliding rod 10-4, and the two screw rods 10-6 are respectively connected by two motor two. 10-3 controls the rotation, and at the same time, the two motors 2 10-3 are fixedly connected to the motor 1 10-2 respectively; that is, the motor 1 10-2 can control the slide bar 10-4, the slider 10-5, and the electromagnetic support base 10. -1 and the overall rotation of the second motor 10-3, the second motor 10-3 controls the linear sliding movement of the electromagnetic support base 10-1 along the screw 10-6; in this embodiment, the electromagnetic support base 10-1 is set as At the same time, the electromagnetic support base 10-1 is provided with a pressure sensor (not shown in the figure) that is connected to the plc system circuit signal, and the motor one 10-2 and the second motor 10-3 are also connected to the plc system circuit signal. , and control the orientation and working state of the electromagnetic support base 10-1 according to the program; when the equipment is just started, there should be an electromagnetic support base 10-1 in a horizontal state with the conveyor belt 4 to wait for the arrival of the fixture 2, and other electromagnetic supports The seat 10-1 is in a vertical state with the conveyor belt 4, which is convenient for the electromagnetic support seat 10-1 in a horizontal state to move smoothly along the conveying direction of the conveyor belt 4 after being adsorbed by the clamp 2; At the same horizontal height position, and staggered at the same time, the one-to-one correspondence positioning and conveying work of an electromagnetic support base 10-1 adsorbing a fixture 2 is realized.

The protective gas introduction mechanism, as shown in Figure 4, mainly includes long gas outlet pipes 11 arranged in the welding area of the membrane electrode sealing assembly 1 and located on both sides of the conveying direction of the conveyor belt 4. The long gas outlet pipes 11 are arranged in an array along its length direction. A plurality of air outlet holes, the air outlet long pipe 11 is sealed through the air pipe and penetrates through the frame body 3 and then connected to the nitrogen cylinder.

The rolling cold-setting zone 6, as shown in Figure 2 or 4, includes a pair of rotating flexible floating rollers 6- 1. The rotating flexible floating roller 6-1 can be made of materials such as rubber. At the same time, the inside of the frame body is provided with driving parts that can control the lifting or rotating of the two rotating flexible floating rollers, such as hydraulic cylinders, driving motors, etc., so as to supply film The electrode sealing assembly is transferred between the two rotating flexible floating rollers 6-1, and the rotating flexible floating roller 6-1 is tangent to the upper surface and the lower surface of the membrane electrode sealing assembly 1 respectively, and the rotating flexible floating roller 6-1 is inside They are all cyclically connected to the cooling water tank 6-3 through the water pipe 6-2, that is, the welded membrane electrode assembly can be placed on the conveyor belt 4 in the rolling and cooling zone 6, and then transferred to the two rotating flexible floating rollers 6 through the conveyor belt 4. Between -1, the two rotating flexible floating rollers 6-1 cool the membrane electrode sealing assembly 1 during the rolling and conveying process, and enhance the packaging effect.

The fixture storage table 13, as shown in Fig. 2 or 4, is arranged between the rolling cold-setting area 6 and the discharge end of the welding area of the membrane electrode sealing assembly 1, and there is also a water storage cavity inside, which is connected to the cooling water tank through the water pipe 6-2. 6-3 is connected to realize the circulating use of the cooling water in the water storage cavity, which is convenient for water-cooling the fixture 2 placed on the fixture storage table 13, so as to wait for the next use, and the water temperature of the cooling water in the cooling water tank 6-3 is 15 ℃ .

In this embodiment, the frame body 3 is provided with an electric lift door 3-1 for sealing the welding area of the membrane electrode sealing assembly 1 at the feeding end and the discharging end of the welding area of the membrane electrode sealing assembly 1, as shown in the figure As shown in 2, it is used to close during the welding process and has a certain protective effect; at the same time, the frame body 3 is close to the welding area of the membrane electrode sealing assembly 1, and the electric lift door 3-1 is equipped with sound insulation cotton (in the figure). not shown), noise pollution in the work area.

A packaging process using the membrane electrode sealing assembly 1 of the continuous packaging equipment in this embodiment, the process uses a customized fixture 2, as shown in FIG. 2-1 For the positioning posts 2-2 at the four corner ends, the sealing process for the membrane electrode sealing assembly 1 in this embodiment includes the following steps:

S1, place the fixture 2 at the feeding end of the conveyor belt 4 for transmission. Under the action of the position adjustment mechanism 12, the fixture 2 can be pushed to the limit area formed by the two infrared beams 12-2 for transmission.

S2, during the transmission process, the staff uses the structure of the limit through holes 1-4 to penetrate the four limit through holes 1-4 of the first sealing frame 1-1 to the positioning columns 2-2 of the fixture 2 respectively, To realize the positioning of the first sealing frame 1-1 in the fixture 2, at this time, make the adhesive surface layer 1-1-2 of the first sealing frame 1-1 face upward.

S3, when the first position sensor 5-7 on the frame body 3 along the conveying direction of the conveyor belt 4 senses the fixture 2, the plc system controls the cylinder two 5-6 in the first set of diffusion layer auxiliary placement limit mechanism 5 to work , so that the two connecting plates 5-1 are turned to be parallel to the conveyor belt 4. At this time, the positioning plate 5-2 is perpendicular to the conveyor belt 4. When the clamp 2 is transferred to the positioning plate 5-2, the clamp 2 will not be able to follow the conveyor belt 4. Continue to move forward. At this time, the staff drops the diffusion layer 1-3 horizontally from the limiting gap 5-4 formed by the half-frame through grooves 5-3 of the two connecting plates 5-1, and the diffusion layer 1- 3. It falls vertically at the center of the first sealing frame 1-1 (an error of 0.3-0.5mm is allowed here), and the coating surface of the first diffusion layer 1-3 faces upwards; the timing program in the plc system controls After the clamp 2 collides with the positioning plate 5-2 for 5S, the second cylinder 5-6 drives the connecting plate 5-1 to be turned away from the conveyor belt 4 to realize the continuous transmission of the clamp 2.

S4, for the fixture 2 that continues to be transmitted after S3 is completed, the staff again uses the structure of the limit through holes 1-4 to penetrate the four limit through holes 1-4 of the catalytic electrode layer 1-2 through the positioning columns of the fixture 2 respectively. On step 2-2, the positioning of the catalytic electrode layer 1-2 in the fixture 2 is realized. At this time, the catalytic electrode layer 1-2-1 in the catalytic electrode layer 1-2 is also in the middle position of the diffusion layer 1-3.

S5, the gripper 2 of S4 is completed and continues to transmit, when the position sensor 5-7 is encountered again, the plc system controls the second group of diffusion layer auxiliary placement limit mechanism 5 in the cylinder 2 5-6 to work, and repeats the action of S3 to make the first The two diffusion layers 1-3 are placed at the center of the catalytic electrode, after which the connecting plate 5-1 is withdrawn, and the clamp 2 continues to transfer.

S6, after completing S5, repeat the action of S1 to cover the adhesive surface layer 1-1-2 of the second sealing frame 1-1 on the non-coating surface of the second diffusion layer 1-3, and complete the superposition of the five and the limit to form the membrane electrode sealing assembly 1 .

S7, after completing S6, the clamp 2 enters the welding area of the membrane electrode sealing assembly 1 under the continuous transmission of the conveyor belt 4, and the electromagnetic support seat 10-1 in the welding area of the membrane electrode sealing assembly 1 is subjected to the pressure from the clamp 2. The electromagnetic adsorption of the clamp 2 and then sliding along with the transmission of the clamp 2 forms the support and local limit for the clamp 2 .

During the continuous transmission process of S8 and S7, when the fourth sensor 7-1 on the laser welding head 7 senses the diffusion layer 1-3, the laser welding equipment realizes laser welding of the membrane electrode sealing assembly 1, and the laser welding head 7 is in Under the preset program, quickly make a circle around the outer periphery of the diffusion layer 1-3 at 3 mm, that is, to form a pre-welded seam 14, and the welding power of the laser welding head 7 is 0.1W; at the same time, the membrane electrode sealing assembly 1 The electric lift gates 3-1 at the feeding end and the discharging end of the welding area are lowered and closed, and the long gas outlet pipe 11 connected with the nitrogen cylinder continuously supplies protective gas to the welding area of the membrane electrode sealing assembly 1, and the nitrogen output flow rate is controlled to 20L /min, the pressure is 0.3Mpa, as shown in Figure 6.

S9, the laser welding head 7 of S8 is moved to the original position and waits, and the fixture 2 continues to be transmitted. When the first sensor 8-3 in the welding head group 1 8 in the ultrasonic linear scanning welding equipment senses that the membrane electrode sealing assembly 1 is exposed When the outer diffusion layer 1-3 is located, the PLC system will trigger the next program command action after receiving the signal from the first sensor 8-3, that is, the PLC system will control the welding head group 1-8 to descend and begin to seal the membrane electrode assembly 1. Contact welding is performed in a sealing area 15. When both the first sensor 8-3 and the second sensor 8-4 in the PLC system disappear, it means that both the first sensor 8-3 and the second sensor 8-4 show no induction. To the diffusion layer 1-3, the program in the plc system instructs the welding head group 1 8 to end the welding of the membrane electrode sealing assembly 1, and the welding head group rises away from the membrane electrode sealing assembly, as shown in FIG. 7 .

S10, the fixture 2 in S9 continues to transmit, and when the third sensor 9-3 in the welding head group two 9 in the ultrasonic linear scanning welding equipment receives the first receiver 2-3 on the fixture 2, the welding head group two 9 starts Scanning welding for the sealing electrode of the membrane electrode, when receiving the second receiver 2-3, the long strip welding head 2 9-1 rises away from the membrane electrode sealing assembly 1, and the two square welding heads 9-2 continue to face each other. The membrane electrode sealing assembly 1 is welded, when receiving the signal of the third receiver 2-3, the long strip welding head 2 9-1 descends again to realize the welding of the membrane electrode sealing assembly 1, when receiving the fourth receiving When the signal of the device 2-3 is received, the welding head group 2 9 all ends the welding of the membrane electrode sealing assembly 1, and the ultrasonic scanning welding of the second sealing area 16 of the membrane electrode sealing assembly 1 has been completed at this time, as shown in FIG. 9 . At the same time, the electromagnetic support 10-1 cancels the adsorption of the clamp 2, and after rotating 90° under the control of the motor 10-2, it is reversely transferred to the feeding end of the welding area of the membrane electrode sealing assembly 1 and waits. At the same time, the electric lift door 3-1 at the discharge end of the welding area of the membrane electrode sealing assembly 1 is opened, as shown in FIG. 2 .

In the ultrasonic linear scanning welding, the pressure of the welding head on the membrane electrode sealing assembly 1 is 0.05MPa.

S11, the clamp 2 drives the welded membrane electrode sealing assembly 1 to fall on the clamp storage table 13, and the staff removes the membrane electrode sealing assembly 1 from the clamp 2, and places it on the conveyor belt 4 of the rolling and cooling zone 6, The membrane electrode sealing assembly 1 is transferred to the two rotating flexible floating rollers 6-1. During the rolling transfer process of the rotating flexible floating rollers 6-1, it is cooled and solidified, and the sealing effect is strengthened, and it is stored in the fixture at the same time. The fixture 2 of the stage 13 is also cooled by the circulating cooling water of the cooling water tank 6-3, and is ready to be used again.

S12, collecting the membrane electrode sealing assembly 1 that has completed S10.

This specific embodiment is only an explanation of the present invention, and it does not limit the present invention. Those skilled in the art can make modifications without creative contribution to the present embodiment as required after reading this specification, but as long as the rights of the present invention are used All claims are protected by patent law.

Claims

A membrane electrode sealing assembly for a fuel cell, the membrane electrode sealing assembly is, in order from bottom to top, a first sealing frame (1-1), a first diffusion layer (1-3), and a catalytic electrode layer (1-2) , the second diffusion layer (1-3) and the second sealing frame (1-1); it is characterized in that:

The first sheet of sealing frame (1-1) and the second sheet of sealing frame (1-1) are provided with through slots (1-1-1) at the intermediate positions, and the first sheet of diffusion layer (1-3) , the catalytic electrode layer (1-2) and the second diffusion layer (1-3) are placed concentrically with the through slot (1-1-1);

The area of the first diffusion layer (1-3) and the second diffusion layer (1-3) is larger than the area of the through slot (1-1-1), and the first sealing frame (1-1) ) and the side in contact with the first diffusion layer (1-3), and the second sealing frame (1-1) and the side in contact with the second diffusion layer (1-3) are coated with Adhesive layer (1-1-2);

The catalytic electrode layer (1-2), the first sealing frame (1-1) and the second sealing frame (1-1) are provided with a plurality of coaxial and corresponding positions at positions close to the corner ends. Limit through holes (1-4).
A fuel cell membrane electrode sealing assembly according to claim 1, wherein the distance between the outer edge of the diffusion layer (1-3) and the edge of the through slot (1-1-1) is equal to 1-2mm.
A packaging process for a fuel cell membrane electrode sealing assembly according to any one of claims 1-2, characterized in that: the membrane electrode sealing assembly (1) is positioned in a fixture (2), and the fixture (2) Comprising a support plate (2-1), and positioning columns (2-2) distributed near the four corner ends of the support plate (2-1), the process includes the following steps:

S1, using the structure of the limit through hole (1-4), place the first sealing frame (1-1) in the fixture (2), and the adhesive surface layer ( 1-1-2) face up, then cover the non-coated surface of the first diffusion layer (1-3) on the middle of the first sealing frame (1-1) adhesive layer (1-1-2) place;

S2, using the structure of the limiting through hole (1-4), the catalytic electrode layer (1-2) is placed in the fixture (2) and covered on the coating surface of the first diffusion layer (1-3);

S3, cover the coating surface of the second diffusion layer (1-3) on the center of the catalytic electrode layer (1-2), and then use the limit through hole (1-4) structure again to seal the second sheet The adhesive surface layer (1-1-2) of the frame (1-1) is covered on the non-coated surface of the second diffusion layer (1-3) to complete the superposition and position limit of the five, forming a membrane electrode sealing assembly ( 1);

S4, the membrane electrode sealing assembly (1) is welded by a laser welding process, and the welding head is welded along the outer peripheral end of the diffusion layer (1-3) at a position of 3-5 mm to form a pre-welded seam (14);

S5, using the ultrasonic linear scanning welding process, in the membrane electrode sealing assembly (1) completed in S4, scanning ultrasonic welding is performed at the superimposed position of the diffusion layer (1-3) and the sealing frame (1-1) to form a diffusion layer The first sealing area (15) at (1-3);

S6, continue to use the ultrasonic linear scanning welding process to perform the second scanning ultrasonic welding on the area between the first and second areas to form a second sealing area (16); the first area is formed by each limit through hole ( 1-4) After the straight lines are connected, the area in the formed closed circle, the second area is the first sealing area (15);

S7, performing cold-setting treatment on the membrane electrode sealing assembly (1) completed in S6, and completing the encapsulation of the membrane electrode sealing assembly (1).
The packaging process of a fuel cell membrane electrode sealing assembly according to claim 3, wherein in the S5 and S6 ultrasonic linear scanning welding processes, the pressure of the welding head on the membrane electrode sealing assembly (1) is 0.05-0.2Mpa , the vibration frequency is 15-40kHz.
A packaging process for a fuel cell membrane electrode sealing assembly according to claim 3, characterized in that: in the S4 laser welding process, the laser power parameter is 0.1-0.3W.
The packaging process of a fuel cell membrane electrode sealing assembly according to claim 3, wherein in the S4-S6 laser welding process and the ultrasonic linear scanning welding process, the welding process is carried out under nitrogen protection, and the nitrogen output The flow is 15-30L/min and the pressure is 0.2-0.5Mpa.
A packaging process for a fuel cell membrane electrode sealing assembly according to claim 3, characterized in that: in the cold-setting treatment in S7, cooling water is used to cool the membrane electrode sealing assembly (1), and the cooling water is used to cool the membrane electrode sealing assembly (1). The water temperature is 10-20℃.
A continuous encapsulation device for realizing a fuel cell membrane electrode encapsulation process according to any one of claims 3 to 7, comprising a rack body (3) and a Plc system, characterized in that: the rack body (3) is provided with a conveyor Mechanism, along the conveying direction from the feeding end to the discharging end of the conveying mechanism, are sequentially provided with the overlapping limit area of the membrane electrode sealing assembly, the welding area of the membrane electrode sealing assembly, and the rolling pressure acting on the membrane electrode sealing assembly (1). cold solidification zone (6);

The membrane electrode sealing assembly includes a limit mechanism (5) for auxiliary placement of the diffusion layer which realizes the precise placement of the diffusion layer (1-3) in the superimposed limit area;

The welding area of the membrane electrode sealing assembly includes laser welding equipment for welding the membrane electrode sealing assembly (1), ultrasonic linear scanning welding equipment, and protective gas introduction mechanisms distributed on both sides of the conveyor belt (4) in the conveying direction.
The continuous encapsulation equipment for membrane electrode encapsulation process according to claim 8, characterized in that: the ultrasonic linear scanning welding equipment is sequentially provided with welding to the first sealing area (15) along the conveying direction of the conveyor belt (4). The first group of welding heads (8), the second group of welding heads (9) for welding the second sealing area (16), the first group of welding heads (8) includes the first group of elongated welding heads (8-1) and the The square welding head one (8-2) at both ends of the long welding head one (8-1), the welding head group two (9) includes the long welding head two (9-1) and the two Two square welding heads (9-2) at both ends of the second shaped welding head (9-1), the two elongated welding heads can move up and down along the corresponding two square welding heads.
The device for continuous encapsulation of membrane electrode encapsulation process according to claim 9, characterized in that: one end (8-1) of the elongated welding head 1 is provided with first sensors respectively on both sides along the thickness direction (8-3) and a second sensor (8-4), the straight-line distance from the first sensor (8-3) to the strip welding head one (8-1), the second sensor (8-4) to The straight-line distance of the elongated welding joint one (8-1) is equal to the width of the first sealing area (15);

The square welding head two (9-2) is provided with a third sensor (9-3), and the fixture (2) is provided with four sensors (9-3) signally connected to the third sensor (9-3) in an array along the length direction. receiver(2-3);

The laser welding equipment includes a laser welding head (7), the laser welding head (7) is located at the front station of the laser welding head (7) along the conveying direction of the conveyor belt (4), and a fourth sensor (7- 1);

The first sensor (8-3), the second sensor (8-4), the third sensor (9-3), the fourth sensor (7-1) and the receiver (2-3) constitute an identification sensor control assembly , the identification sensor control components are all connected with the plc system circuit signal.