Membrane electrode frame glue injection process

Abstract

The invention relates to a membrane electrode frame glue injection process, which comprises the following steps of: 1, respectively dispensing glue on two surfaces of a membrane electrode; step 2, respectively pasting gas diffusion layers on the two surfaces of the membrane electrode after dispensing to form a semi-finished product; the invention relates to the technical field of membrane electrode frame glue injection. According to the membrane electrode frame glue injection process, punching and glue injection are combined together through a glue injection mold structure, glue injection forming can be carried out after through holes are punched in the two sides of a semi-finished product rapidly, the upper frame and the lower frame are connected more tightly, and glue lines on the two sides of the membrane electrode frame can be connected and fixed through communicating holes; the problem of dislocation of the glue lines on the two sides of the membrane electrode in the assembling process of the cell stack is effectively solved, and the sealing performance of the finished cell stack is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of membrane electrode frame glue injection, in particular to a membrane electrode frame glue injection process. Background Art

[0002] The existing membrane electrode frame glue injection process is as follows: the cutting machine cuts the liquid silicone roll into the required shape, the robot takes a piece of cut liquid silicone and puts it on the bottom layer of the jig, then takes the 3CCM membrane electrode and puts it in the middle, and then puts the reverse side of the cut liquid silicone on the top layer, then covers the jig, flows into the next station, heats the jig to melt the liquid silicone to form a frame, and then flows into the next station to cool and form a 5CCM membrane electrode with a frame, and then pastes GDL (gas diffusion layer) on both sides of the 5CCM membrane electrode to form a 7CCM membrane electrode with a frame. The sealing strip is glued on the electrode plate, first glued on one side of the electrode plate, and then glued on the other side of the electrode plate after curing to form a bipolar plate with a double-sided sealing strip. After the above process, an electrode plate with a frame 7CCM membrane electrode and a sealing strip is formed, and the two are pressed and formed. The above process has the following disadvantages: the steps are very cumbersome, the overall production steps are many, the efficiency is low, the number of equipment required is large, the labor required is large, and the cycle is long.

[0003] According to the membrane electrode frame glue injection process described in patent number CN116238093A, the molding is directly performed during use, which has the following problems:

[0004] (1) The upper and lower frames are formed separately, and there is no tight connection between them, which makes them easy to fall off later, and the wrapping effect is poor.

[0005] (2) After the later stage of molding, there are a large number of bubbles inside the frame, which cannot be effectively discharged, affecting the quality of the finished product. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a membrane electrode frame glue injection process to solve the above-mentioned problems.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A membrane electrode frame glue injection process: comprising the following steps:

[0008] Step 1: Apply glue to both sides of the membrane electrode;

[0009] Step 2, attaching gas diffusion layers to both sides of the glue-dispensed membrane electrode to form a semi-finished product;

[0010] Step 3: Place the semi-finished product into the injection mold, place the semi-finished product into the lower cavity of the lower mold, and then press the upper mold downward to combine the upper cavity and the lower cavity to form a cavity;

[0011] The fourth step is to punch holes in the semi-finished product through the injection mold, and the punch rod is driven downward by the driving cylinder to drive the punch rod to move downward, which drives the punch rod to move downward and sequentially penetrate the upper connecting groove, the upper cavity, the lower connecting groove and the lower cavity to punch holes in the semi-finished product frame, and flush the debris inside it into the lower connecting groove. When the punch rod descends, the upper press frame moves, abuts against the receiving rod downward in advance, and the top plate is squeezed to move downward. The top plate squeezes the reset spring to move downward, driving the lower ejector rod to move below the lower connecting groove. Then, the semi-finished product can be punched and the debris can be flushed into the empty groove below. At this time, the debris is blown into the empty groove by the blowing bucket for centralized processing, and then the driving cylinder drives the punch rod to reset. At this time, the upper press frame moves upward and loses the abutment against the receiving rod. Then the reset spring drives the lower ejector rod to reset, and drives the lower ejector rod to be inserted into the lower connecting groove to continue sealing.

[0012] Step 5: Inject liquid silicone into the injection mold to inject glue into the semi-finished product, and inject glue into the semi-finished product through the runner to form a frame;

[0013] Step 6: Remove bubbles from the semi-finished product in the injection mold. Start the vibration motor to drive the metal film to vibrate through the conduction frame, drive the semi-finished product to vibrate, and make the liquid silicone in the upper cavity and the lower cavity vibrate, effectively discharge the internal bubbles, and keep the metal film level through the support net and the steel wire.

[0014] Step 7: Curing and molding, then output the finished product.

[0015] As a further solution of the present invention: when punching is performed in step four, the driving cylinder drives the punch rod to move downward, driving the punch rod to move downward and sequentially penetrate the upper connecting groove, the upper cavity, the lower connecting groove and the lower cavity, punching the semi-finished frame, and flushing the debris inside it into the lower connecting groove.

[0016] As a further solution of the present invention: when punching in step 4, the debris is blown into the empty slot through the blowing hopper for centralized treatment.

[0017] As a further solution of the present invention: when punching in step four, the driving cylinder drives the punch rod to reset, and the upper pressure frame moves upward and loses the abutment against the receiving rod, and then the reset spring drives the lower push rod to reset, and drives the lower push rod to be inserted into the lower connecting groove to continue sealing.

[0018] As a further solution of the present invention: when punching in step four, the distance between the punch rod and the lower push rod is greater than the distance between the upper pressure frame and the receiving rod, and the distance is the depth of the lower connecting groove.

[0019] As a further solution of the present invention: when injecting glue in step six, start the vibration motor to drive the metal film to vibrate through the conduction frame, drive the semi-finished product to vibrate, and make the liquid silicone in the upper cavity and the lower cavity vibrate to discharge the bubbles inside.

[0020] As a further solution of the present invention: in step six, the top of the metal film is flush with the lower cavity, and the bottom of the metal film is connected to the bottom of the inner cavity of the inner groove through a steel wire that passes through the support mesh.

[0021] The injection mold comprises an upper mold and a lower mold, the inner cavity of the upper mold is provided with an upper cavity adapted to the semi-finished product, the inner cavity of the lower mold is provided with a lower cavity adapted to the semi-finished product, the inner cavity of the upper mold is fixedly connected with a driving cylinder, one end of the driving cylinder piston rod is fixedly connected with a punch rod, the inner cavity of the upper mold is provided with an upper connecting groove which is slidably sealed with the punch rod, the bottom of the upper connecting groove is connected with and flush with the inner cavity of the upper mold cavity, the inner cavity of the lower mold is fixedly connected with a return spring through a cavity, the top of the return spring is fixedly connected with a top plate, the top plate is fixedly connected with a lower ejector rod, the inner cavity of the lower mold is provided with a lower connecting groove which is slidably sealed with the surface of the lower ejector rod, the top of the lower connecting groove is connected with and flush with the inner cavity of the lower mold cavity, and the inner cavity of the empty groove is fixed with a connection with an external fan The blow hopper is connected with the air outlet facing the lower connecting groove, the diameters of the punch rod and the lower ejector rod are the same, the inner diameters of the upper connecting groove and the lower connecting groove are the same, the punch rod, the lower ejector rod, the upper connecting groove and the lower connecting groove are all coaxial, one side of the punch rod is fixedly connected with an upper press frame that penetrates and extends to the outside of the upper mold, and one side of the lower ejector rod is fixedly connected with a receiving rod that penetrates and extends to the outside of the lower mold. When the punch rod and the lower ejector rod are in an initial state, the spacing between the punch rod and the lower ejector rod is greater than the spacing between the upper press frame and the receiving rod, and the distance is the depth of the lower connecting groove. When in use, the gas diffusion layers are respectively attached to both sides of the membrane electrode after glue application to form a semi-finished product, and then the semi-finished product is placed in the lower cavity in the lower mold, and then the upper mold is pressed down, and the upper cavity and the lower cavity are combined to form a cavity. At this time, the punch rod is driven downward by the driving cylinder, and the punch rod is driven to move downward to sequentially penetrate the upper connecting groove, the upper cavity, the lower connecting groove and the lower cavity to punch holes in the semi-finished product frame, and the debris inside it is flushed into the lower connecting groove. When the punch rod descends, the upper pressure frame moves, and contacts the receiving rod downward in advance, and the top plate is squeezed to move downward. The top plate squeezes the reset spring to move downward, and drives the lower ejector rod to move below the lower connecting groove. Then, the semi-finished product can be punched and the debris is flushed into the empty groove below. At this time, the debris is blown into the empty groove through the blowing bucket for centralized processing, and then the driving cylinder drives the punch rod to reset. At this time, the upper pressure frame moves upward and loses its contact with the receiving rod. Then the reset spring drives the lower ejector rod to reset, and drives the lower ejector rod to be inserted into the lower connecting groove to continue. The mold is sealed, and then the semi-finished product is injected with glue through the runner to form a frame. The inner cavity of the lower mold is provided with an inner groove whose top is flush with the lower cavity. The inner groove is arranged at the center of the lower cavity. The inner cavity of the inner groove is fixedly connected with a metal film whose top is flush with the lower cavity. The inner cavity of the inner groove is fixedly connected with a supporting net located below the metal film and abutting against it. The bottom of the metal film is connected to the bottom of the inner cavity of the inner groove through a steel wire penetrating the supporting net. The inner cavity of the inner groove is fixedly connected with a vibration motor. The vibration end of the vibration motor is fixedly connected with a conductive frame. The top of the conductive frame penetrates the supporting net and abuts against the bottom of the metal film. When the glue is injected after the punching is completed, the glue flows to the bottom through the punched holes, and the upper and lower frames are connected more tightly.The glue lines on both sides of the membrane electrode frame can be connected and fixed through the connecting holes, which effectively solves the problem of misalignment of the glue lines on both sides of the membrane electrode during the battery stack assembly process, and ensures the sealing of the finished battery stack. At this time, the vibration motor is started to drive the metal film to vibrate through the conduction frame, and the semi-finished product to vibrate, so that the liquid silicone in the upper and lower cavities vibrates, effectively discharging the internal bubbles, and the metal film can be kept horizontal through the support net and steel wire limit, which can effectively discharge the bubbles in the liquid silicone from the pores without affecting the injection molding process, and the quality of the molded frame glue line is better.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention combines punching and glue injection together through a glue injection mold structure, and can quickly punch through holes on both sides of the semi-finished product and then perform glue injection molding. The upper and lower frames are connected more tightly, so that the glue lines on both sides of the membrane electrode frame can be connected and fixed through the connecting holes, which effectively solves the problem of misalignment of the glue lines on both sides of the membrane electrode during the battery stack assembly process and ensures the sealing of the finished battery stack.

[0024] 2. The present invention drives the metal film to vibrate through the conduction frame by a vibration motor, drives the semi-finished product to vibrate, and causes the liquid silicone in the upper cavity and the lower cavity to vibrate, effectively discharging the internal bubbles. The metal film can be kept horizontal by limiting the support net and the steel wire, and the bubbles in the liquid silicone can be effectively discharged from the pores without affecting the injection molding process, so that the quality of the molded frame glue line is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the glue injection mold of the present invention;

[0026] Figure 2 It is a structural cross-sectional view of the glue injection mold of the present invention;

[0027] Figure 3 For the present invention Figure 2 A partial enlarged view of the middle A;

[0028] Figure 4 For the present invention Figure 2 A partial enlarged view of point B in the middle;

[0029] Figure 5 For the present invention Figure 1 A partial enlarged view of point C in the middle;

[0030] Figure 6 It is a top view of the structure of the support net of the present invention.

[0031] In the figure: 1. upper mold; 2. lower mold; 3. upper cavity; 4. lower cavity; 5. semi-finished product; 6. inner groove; 7. metal film; 8. support net; 9. steel wire; 10. vibration motor; 11. conduction frame; 12. driving cylinder; 13. upper connecting groove; 14. punch rod; 15. upper pressure frame; 16. return spring; 17. ejector plate; 18. lower ejector rod; 19. lower connecting groove; 20. receiving rod; 21. air blowing bucket.

[0032] Specific implementation method

[0033] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0034] See also Figure 1-6 The present invention provides a technical solution: a membrane electrode frame glue injection process: comprising the following steps:

[0035] Step 1: Apply glue to both sides of the membrane electrode;

[0036] Step 2, attaching gas diffusion layers to both sides of the glued membrane electrode to form a semi-finished product 5;

[0037] Step 3: Place the semi-finished product 5 into the injection mold, place the semi-finished product 5 into the lower cavity 4 in the lower mold 2, and then press the upper mold 1 downward, so that the upper cavity 3 and the lower cavity 4 are combined to form a cavity;

[0038] Step 4: Punch the semi-finished product 5 through the injection mold, drive the punch rod 14 downward by driving the cylinder 12, drive the punch rod 14 to move downward, and sequentially penetrate the upper connecting groove 13, the upper cavity 3, the lower connecting groove 19 and the lower cavity 4, punch the semi-finished product 5 frame, and flush the internal debris into the lower connecting groove 19. When the punch rod 14 descends, the upper pressure frame 15 moves, and advances downward to abut against the receiving rod 20, squeezes the top plate 17 to move downward, and the top plate 17 squeezes the reset spring 16 moves downward, driving the lower push rod 18 to move to the bottom of the lower connecting groove 19, and then the semi-finished product 5 can be punched and the debris can be punched into the empty groove below. At this time, the debris is blown into the empty groove by the blowing bucket 21 for centralized treatment, and then the cylinder 12 is driven to drive the punch rod 14 to reset. At this time, the upper pressing frame 15 moves upward and loses the contact with the receiving rod 20. Then the reset spring 16 drives the lower push rod 18 to reset, and drives the lower push rod 18 to be inserted into the lower connecting groove 19 to continue sealing;

[0039] Step 5: Inject liquid silicone into the injection mold to inject glue into the semi-finished product 5, and inject glue into the semi-finished product 5 through the runner to form a frame;

[0040] Step 6: Remove bubbles from the semi-finished product 5 in the injection mold. Start the vibration motor 10 to drive the metal film 7 to vibrate through the conduction frame 11, and drive the semi-finished product 5 to vibrate, so that the liquid silicone in the upper cavity 3 and the lower cavity 4 vibrates, effectively discharges the bubbles inside, and the metal film 7 can be kept horizontal through the support net 8 and the steel wire 9.

[0041] Step 7: Curing and molding, then output the finished product.

[0042] When punching in step four, the driving cylinder 12 drives the punch rod 14 to move downward, driving the punch rod 14 to move downward and sequentially penetrate the upper connecting groove 13, the upper cavity 3, the lower connecting groove 19 and the lower cavity 4, punching the semi-finished product 5 frame and flushing the internal debris into the lower connecting groove 19.

[0043] When punching is performed in step 4, the debris is blown into the empty slot by the blowing hopper 21 for centralized treatment.

[0044] When punching in step 4, the driving cylinder 12 drives the punch rod 14 to reset. At this time, the upper pressure frame 15 moves upward and loses the contact with the receiving rod 20. Then the reset spring 16 drives the lower push rod 18 to reset, and drives the lower push rod 18 to be inserted into the lower connecting groove 19 to continue sealing.

[0045] When punching in step 4, the distance between the punch rod 14 and the lower push rod 18 is greater than the distance between the upper press frame 15 and the receiving rod 20, and the distance is the depth of the lower connecting groove 19.

[0046] When the glue is injected in step six, the vibration motor 10 is started to drive the metal film 7 to vibrate through the conductive frame 11, and drive the semi-finished product 5 to vibrate, so that the liquid silicone in the upper cavity 3 and the lower cavity 4 vibrates to discharge the bubbles inside.

[0047] In step six, the top of the metal film 7 is flush with the lower cavity 4 , and the bottom of the metal film 7 is connected to the bottom of the inner cavity of the inner groove 6 through the steel wire 9 that passes through the support mesh 8 .

[0048] The injection mold comprises an upper mold 1 and a lower mold 2. The inner cavity of the upper mold 1 is provided with an upper cavity 3 adapted to the semi-finished product 5, the inner cavity of the lower mold 2 is provided with a lower cavity 4 adapted to the semi-finished product 5, the inner cavity of the upper mold 1 is fixedly connected with a driving cylinder 12, one end of the piston rod of the driving cylinder 12 is fixedly connected with a punch rod 14, the inner cavity of the upper mold 1 is provided with an upper connecting groove 13 which is slidably sealed with the punch rod 14, the bottom of the upper connecting groove 13 is communicated with and flush with the inner cavity of the upper cavity 3, the inner cavity of the lower mold 2 is fixedly connected with a reset spring 16 through a cavity, the top of the reset spring 16 is fixedly connected with a top plate 17, the top plate 17 is fixedly connected with a lower ejector rod 18, the inner cavity of the lower mold 2 is provided with a lower connecting groove 19 which is slidably sealed with the surface of the lower ejector rod 18, the top of the lower connecting groove 19 is connected with the lower mold The inner cavity of cavity 4 is connected and flush, the inner cavity of the empty slot is fixed with a blowing bucket 21 connected to the external fan and with the air outlet facing the lower connecting slot 19, the diameter of the punch rod 14 and the lower ejector rod 18 are the same, the inner diameter of the upper connecting slot 13 and the lower connecting slot 19 are the same, the punch rod 14, the lower ejector rod 18, the upper connecting slot 13 and the lower connecting slot 19 are all coaxial, one side of the punch rod 14 is fixedly connected with an upper pressure frame 15 that penetrates and extends to the outside of the upper mold 1, and one side of the lower ejector rod 18 is fixedly connected with a receiving rod 20 that penetrates and extends to the outside of the lower mold 2. When the punch rod 14 and the lower ejector rod 18 are in the initial state, the distance between the punch rod 14 and the lower ejector rod 18 is greater than the distance between the upper pressure frame 15 and the receiving rod 20, and the distance is the depth of the lower connecting slot 19. When in use, the glue is dispensed The gas diffusion layers are respectively attached to both sides of the membrane electrode to form a semi-finished product 5, and then the semi-finished product 5 is placed in the lower cavity 4 in the lower mold 2, and then the upper mold 1 is pressed down, and the upper cavity 3 and the lower cavity 4 are combined to form a cavity. At this time, the punch rod 14 is driven downward by the driving cylinder 12 to drive the punch rod 14 to move downward in sequence through the upper connecting groove 13, the upper cavity 3, the lower connecting groove 19 and the lower cavity 4, punching the semi-finished product 5 frame, and flushing the internal debris into the lower connecting groove 19. When the punch rod 14 descends, the upper pressing frame 15 moves and advances downward to abut against the receiving rod 20, squeezing the top plate 17 to move downward, and the top plate 17 squeezes the reset spring 16 to move downward, driving the lower push rod 18 to move to the bottom of the lower connecting groove 19, and then the semi-finished product 5 can be The finished product 5 is punched and the debris is punched into the empty slot below. At this time, the debris is blown into the empty slot through the blowing bucket 21 for centralized processing, and then the cylinder 12 is driven to drive the punch rod 14 to reset. At this time, the upper pressure frame 15 moves upward and loses the abutment against the receiving rod 20, and then the reset spring 16 drives the lower push rod 18 to reset, and drives the lower push rod 18 to be inserted into the lower connecting groove 19 to continue sealing, and then the semi-finished product 5 is injected with glue through the runner to form a frame. The inner cavity of the lower mold 2 is provided with an inner groove 6 whose top is flush with the lower cavity 4, and the inner groove 6 is arranged at the center of the lower cavity 4. The inner cavity of the inner groove 6 is fixedly connected with a metal film 7 whose top is flush with the lower cavity 4, and the inner cavity of the inner groove 6 is fixedly connected with a support net 8 located below the metal film 7 and abutting against it.The bottom of the metal film 7 is connected to the bottom of the inner cavity of the inner groove 6 through the steel wire 9 that penetrates the support net 8. The inner cavity of the inner groove 6 is fixedly connected with a vibration motor 10. The vibration end of the vibration motor 10 is fixedly connected with a conductive frame 11. The top of the conductive frame 11 penetrates the support net 8 and abuts against the bottom of the metal film 7. When the glue is injected after the punching is completed, the glue flows to the bottom through the punched holes, and the upper and lower frames are connected more tightly, so that the glue lines on both sides of the membrane electrode frame can be connected and fixed through the connecting holes, which effectively solves the problem of misalignment of the glue lines on both sides of the membrane electrode during the assembly of the battery stack, and ensures the sealing of the finished battery stack. At this time, the vibration motor 10 is started to drive the metal film 7 to vibrate through the conductive frame 11, and drive the semi-finished product 5 to vibrate, so that the liquid silicone in the upper cavity 3 and the lower cavity 4 vibrates, effectively discharges the internal bubbles, and the metal film 7 can be kept horizontal through the support net 8 and the steel wire 9. The bubbles in the liquid silicone can be effectively discharged from the pores without affecting the injection molding process, and the quality of the molded frame glue line is better.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A membrane electrode frame glue injection process, characterized in that: The following steps are involved: Step 1: Apply glue to both sides of the membrane electrode; Step 2, attaching gas diffusion layers to both sides of the glue-dispensed membrane electrode to form a semi-finished product (5); Step 3: Place the semi-finished product (5) into the injection mold, place the semi-finished product (5) into the lower cavity (4) in the lower mold (2), and then press the upper mold (1) downward, so that the upper cavity (3) and the lower cavity (4) are combined to form a cavity; Step 4: punching holes in the semi-finished product (5) through a glue injection mold; Step 5: inject liquid silicone into the injection mold to inject glue into the semi-finished product (5), and inject glue into the semi-finished product (5) through the runner to form a frame; Step 6, removing bubbles from the semi-finished product (5) in the injection mold; Step 7: Curing and molding, then output the finished product.

2. A membrane electrode frame glue injection process according to claim 1, characterized in that: When punching holes in step 4, the driving cylinder (12) drives the punch rod (14) to move downward, driving the punch rod (14) to move downward and sequentially penetrate the upper connecting groove (13), the upper cavity (3), the lower connecting groove (19) and the lower cavity (4), punching holes in the semi-finished product (5) frame, and flushing the debris inside into the lower connecting groove (19).

3. A membrane electrode frame glue injection process according to claim 1, characterized in that: When punching is performed in step 4, the debris is blown into the empty slot through the blowing hopper (21) for centralized treatment.

4. A membrane electrode frame glue injection process according to claim 1, characterized in that: When punching is performed in step 4, the driving cylinder (12) drives the punch rod (14) to reset, and the upper pressure frame (15) moves upward and loses the contact with the receiving rod (20), and then the reset spring (16) drives the lower push rod (18) to reset, and drives the lower push rod (18) to be inserted into the lower connecting groove (19) to continue sealing.

5. The membrane electrode frame glue injection process according to claim 1, characterized in that: When punching in step 4, the distance between the punch rod (14) and the lower push rod (18) is greater than the distance between the upper pressure frame (15) and the receiving rod (20), and the distance is the depth of the lower connecting groove (19).

6. A membrane electrode frame glue injection process according to claim 1, characterized in that: When the glue is injected in step six, the vibration motor (10) is started to drive the metal film (7) to vibrate through the conduction frame (11), and drive the semi-finished product (5) to vibrate, so that the liquid silicone in the upper cavity (3) and the lower cavity (4) vibrate, and the bubbles inside are discharged.

7. The membrane electrode frame glue injection process according to claim 1, characterized in that: In step six, the top of the metal film (7) is flush with the lower cavity (4), and the bottom of the metal film (7) is connected to the bottom of the inner cavity of the inner groove (6) through a steel wire (9) that passes through the support mesh (8).

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