One-step process for double-side coating of aluminum-plastic film for soft-pack battery

Abstract

This application relates to a one-step dry lamination process for aluminum-plastic film double-sided coating for soft-pack batteries, and pertains to the field of soft-pack battery encapsulation materials. It includes aluminum foil pretreatment: unwinding aluminum foil, performing chromating treatment and / or plasma surface treatment on the aluminum foil; double-sided adhesive coating: conveying the pretreated aluminum foil using a conveying assembly and an adhesive roller, and applying adhesive to both sides of the aluminum foil during the conveying process; lamination: conveying a PA film on one side of the aluminum foil and a PP film on the other side using the conveying assembly, and then clamping the PA film and PP film onto the surface of the coated aluminum foil using a lamination device to achieve bonding and lamination, followed by heat curing, ripening, slitting, and packaging into finished products. This application has the effect of simultaneously laminating PA and PP films on both sides of the aluminum foil at one time, improving lamination efficiency.

Description

Technical Field

[0001] This application relates to the field of pouch battery packaging materials, and in particular to a one-step dry composite process for double-sided coating of aluminum-plastic film for pouch batteries. Background Technology

[0002] In recent years, with the increase in lithium battery technology and production, the demand for lithium battery packaging materials has also been growing. In addition to traditional steel or metal casings, metal-plastic composite films (also known as soft packaging films) are also an important method of battery packaging. Due to the high energy density and high battery safety of soft-pack batteries made with soft packaging films, soft packaging films have become the mainstream of future battery packaging material applications.

[0003] In the packaging materials of soft-pack batteries, the main method currently used is to laminate PP film and PA film on both sides of aluminum foil to form an aluminum-plastic film. The existing lamination process is as follows: after the aluminum foil is subjected to chromating treatment and plasma surface treatment in sequence, a layer of PP film is first bonded to the surface of the treated aluminum foil. After the first lamination is completed, a PA film is then bonded to the other side of the aluminum foil to form an aluminum-plastic film with a three-layer composite structure of PP film, aluminum foil and PA film.

[0004] Regarding the aforementioned technologies, the inventors discovered that the composite process requires two single-sided lamination operations to complete the bonding and lamination of the three layers of materials: PP film, aluminum foil, and PA film. The repeated lamination operation leads to low production efficiency, and therefore needs to be improved. Summary of the Invention

[0005] In order to reduce the number of lamination steps and improve the lamination efficiency of aluminum-plastic film while ensuring the achievement of three-layer lamination, this application provides a one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries.

[0006] Firstly, the equipment used in the one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries provided in this application adopts the following technical solution:

[0007] An apparatus for a one-step dry lamination process of aluminum-plastic film double-sided coating for soft-pack batteries includes an aluminum foil pretreatment device for chromating and / or plasma surface treatment of the aluminum foil; it also includes a conveying assembly, an adhesive supply assembly, a laminating device, and at least two coating rollers; the adhesive supply assembly is used to apply adhesive to the surfaces of the two coating rollers, with a conveying gap between the two coating rollers for the aluminum foil to pass through; the conveying assembly is used to drive the coating rollers to rotate so that the aluminum foil passes through the conveying gap along a preset conveying direction; the conveying assembly is also used to convey PA film and PV film along the preset conveying direction; the coating rollers and the laminating device are arranged sequentially along the conveying direction, and the laminating device is used to simultaneously extrude the aluminum foil, PA film, and PV film toward each other.

[0008] By adopting the above technical solution, the aluminum foil is subjected to chromating and plasma surface treatment by an aluminum foil pretreatment device. Then, the treated aluminum foil is inserted into the middle conveying gap, so that the PA film is located on one side of the aluminum foil and the PV film is located on the other side. Next, the adhesive is applied to the surface of two coating rollers by the adhesive supply component. The aluminum foil, PA film, and PV film are simultaneously conveyed along the conveying direction by the conveying component. The adhesive on the surface of the coating rollers will adhere to both sides of the aluminum foil under the action of the rotating coating rollers. Since the PA film and PV film are located on the two sides of the aluminum foil respectively, the three films are squeezed towards each other by the laminating device. This can ultimately achieve the one-time bonding of the PA film and PV film to both sides of the aluminum foil. That is, by applying adhesive to both sides of the aluminum foil and conveying the aluminum foil, PA film, and PV film at the same time, the number of lamination steps is reduced and the lamination efficiency of the three films is improved.

[0009] Preferably, the composite device includes two clamping plates, a moving component, and a heating element. A clamping gap is reserved between the two clamping plates for aluminum foil, PA film, and PV film to pass through. The moving component is used to drive the two clamping plates to move towards each other or away from each other. The heating element is used to heat the clamping gap.

[0010] By adopting the above technical solution, since the coating roller and the laminating device are arranged sequentially along the conveying direction, when the PA film, PV film, and aluminum foil coated with adhesive pass through the clamping gap, the moving component can drive the two clamping plates to move towards each other. In this process of moving towards each other, the PA film is bonded to one side of the aluminum foil and the PV film is bonded to the other side of the aluminum foil by adhesive bonding, thus achieving one-time double-sided lamination. In addition, the setting of the heating element can optimize the bonding effect, so that the PA film and PV film are stably bonded to the surface of the aluminum foil.

[0011] Preferably, the moving component includes a frame, an elastic element, and a pusher protrusion; the conveying component includes a take-up roller rotatably connected to the frame and a first rotating element for driving the take-up roller to rotate; the composite device and the take-up roller are arranged sequentially along the conveying direction, and the pusher protrusion is disposed on the side wall of the take-up roller;

[0012] One of the clamping plates is fixed relative to the frame, and the other clamping plate is a movable clamping plate that is slidably connected to the frame. The elastic element is used to drive the movable clamping plate to move away from the other clamping plate. When the elastic element is not deformed, the movable clamping plate is located on the rotation path of the push-up protrusion. The push-up protrusion is used to drive the movable clamping plate to move closer to the other clamping plate during rotation.

[0013] By adopting the above technical solution, the winding of the composite product is achieved by the rotation of the winding roller. During the rotation of the winding roller, the pusher protrusion rotates together with the winding roller and pushes the movable clamping plate when it comes into contact with the movable clamping plate, so that the movable clamping plate moves towards the other clamping plate, thereby achieving the clamping and pressing of aluminum foil, PA film and PV film, so that the aluminum foil, PA film and PV film are bonded and laminated. When the pusher protrusion rotates to the position where it is no longer in contact with the movable clamping plate, the movable clamping plate will move away from the other clamping plate and reset under the elastic force of the elastic element.

[0014] Preferably, each of the coating rollers corresponds to a glue supply assembly, which includes a glue storage box and a glue transfer roller. The side wall of the glue storage box has a through-hole for communicating with the inner cavity of the glue storage box. The glue transfer roller is rotatably connected to the inner wall of the glue outlet, and a glue discharge gap is reserved between the glue transfer roller and the inner wall of the glue outlet. The glue transfer roller is in contact with the surface of the corresponding coating roller.

[0015] By adopting the above technical solution, when the conveying component drives the coating roller to rotate, since the glue transfer roller is in contact with the corresponding coating roller, the glue transfer roller will also rotate under the drive of the coating roller, and during the rotation, the glue in the glue storage box will be coated onto the coating roller. In addition, the setting of the glue outlet gap can ensure that the glue adhering to the surface of the coating roller can be discharged from the glue storage box with the coating roller, reducing the situation where the glue on the surface of the coating roller cannot be discharged from the glue storage box due to the scraping between the coating roller and the inner wall of the glue outlet.

[0016] Preferably, the glue supply assembly further includes a second rotating component for driving the glue-spreading roller to rotate.

[0017] By adopting the above technical solution, since the glue is viscous, in order to ensure that the glue-coating roller can rotate stably and smoothly coat the glue on its surface onto the coating roller during the rotation process, a second rotating component is specially set to drive the glue-coating roller to rotate independently. This eliminates the need for the glue-coating roller to rely on the friction between the coating roller and the rotating roller to achieve rotation, thereby improving the smoothness of the coating roller's rotation.

[0018] Preferably, the glue storage box is provided with a push plate, which slides towards or away from the glue outlet and is connected to the glue storage box. The glue outlet is located on the sliding path of the push plate. The glue storage box is also provided with a glue pushing assembly, which is used to drive the push plate to slide and cause the push plate to deliver the glue on the inner wall of the glue storage box to the glue outlet when it slides.

[0019] By adopting the above technical solution, the pusher plate is driven by the glue pushing assembly to slide along the inner wall of the glue storage box. When it slides towards the glue outlet, the glue is pushed and concentrated at the glue outlet, ensuring that the surface of the glue-applying roller is filled with glue, thereby improving the glue-applying effect of the transition roller on the surface of the corresponding glue-applying roller.

[0020] Preferably, there are two push plates, which are distributed on the inner walls of the glue storage boxes on both sides of the glue outlet; the glue pushing assembly includes a connecting rod, a connecting cam, a sliding frame, a resetting component, a connecting gear, and a connecting rack; the connecting rod, the connecting cam, the connecting gear, and the connecting rack are all arranged in a one-to-one correspondence with the push plates;

[0021] The push plate is connected to the corresponding docking rod, which is rotatably connected to the inner end wall of the glue storage box. When the push plate rotates around the corresponding docking rod, it always stays in contact with the inner wall of the glue storage box. The docking gear is sleeved on the corresponding docking rod, and the docking rack meshes with the corresponding docking gear. All the docking racks are connected to the sliding frame. The docking cam is sleeved on the corresponding glue transfer roller. The docking cam is used to push the sliding frame when it rotates with the glue transfer roller, so that the sliding frame slides away from the glue transfer roller. The sliding direction is parallel to the length direction of the docking rack. The reset member is used to drive the sliding frame to slide closer to the glue transfer roller.

[0022] By adopting the above technical solution, when the glue-spreading roller rotates, the docking cam rotates accordingly and pushes against the sliding frame during the rotation process. This causes the sliding frame to drive the docking rack to slide away from the glue-spreading roller. At this time, the docking rack will drive the docking gear to rotate, which in turn causes the docking rod to slide against the inner wall of the glue storage box of the push plate, thereby scraping the inner wall of the glue storage box. When the docking cam disengages from the sliding frame, the sliding frame can be driven to slide and reset in the opposite direction by the reset component, which in turn causes the docking rod to rotate in the opposite direction. This allows the push plate to scrape the inner wall of the glue storage box back and forth. During the scraping process, some of the glue in the glue storage box will inevitably move to the glue outlet under the push of the push plate, ensuring that the surface of the glue-spreading roller is covered with glue.

[0023] Preferably, the side wall of the docking rod has a slot for inserting a corresponding push plate. The push plate slides along the length of the slot and is connected to the inner wall of the corresponding slot. A limit spring is connected between the inner wall of the slot and the push plate. The length of the limit spring is parallel to the length of the slot. When the limit spring is not deformed, the end of the push plate away from the docking rod is not in contact with the inner wall of the glue storage box. The glue storage box is also provided with a driving component, which is used to drive the push plate to slide relative to the length of the slot so that the end of the push plate away from the docking rod is in contact with the inner wall of the glue storage box.

[0024] By adopting the above technical solution, when the push plate slides towards the discharge port, the drive component can make the end of the push plate fit against the inner wall of the glue storage box, so that the push plate scrapes against the inner wall of the glue storage box, causing the glue on the inner wall of the glue storage box to move towards the discharge port under the push of the push plate. When the push plate moves away from the discharge port, the drive component can be released to drive the push plate, and the elastic force of the limit spring can drive the push plate to reset, so that the push plate is disengaged from the inner wall of the glue storage box, reducing the amount of glue pushed away from the discharge port by the push plate.

[0025] Preferably, the driving component and the docking rod are arranged in a one-to-one correspondence. The driving component includes a plug rod, a return spring sleeved on the plug rod, a driving plate rotatably connected to the glue storage box, and a driving gear coaxially arranged on the driving plate. One end of the plug rod slides towards or away from the slot and is connected to the corresponding docking rod. When the return spring is not deformed, the other end of the plug rod is located on the rotation path of the driving plate. When the limiting spring is not deformed, the end of the push plate is located on the sliding path of the plug rod. The driving gear meshes with the docking rack. The driving plate is used to push the plug rod when rotating towards the plug rod, so that the plug rod pushes the end of the push plate.

[0026] By adopting the above technical solution, when the sliding frame slides back and forth, the docking rack drives the drive gear to rotate in both directions, and in the process of rotation, it drives the drive plate to rotate towards or away from the insertion rod. When the drive plate rotates towards the insertion rod, the insertion rod will extend into the slot and push against the push rod, so that the push rod abuts against the inner wall of the glue storage box. When the drive plate rotates away from the insertion rod, the drive plate disengages from the end of the insertion rod. At this time, the insertion rod will release its pushing force against the push rod under the action of the return spring, so that the push rod disengages from the inner wall of the glue storage box under the action of the limit spring.

[0027] Secondly, this application also provides a one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries, comprising the following steps:

[0028] Aluminum foil pretreatment: unwind aluminum foil, and perform chromating treatment and / or plasma surface treatment on the aluminum foil;

[0029] Double-sided adhesive coating: The pre-treated aluminum foil is conveyed using a conveying assembly and an adhesive coating roller, and adhesive is applied to both sides of the aluminum foil during the conveying process;

[0030] Lamination: A PA film is conveyed on one side of the aluminum foil and a PP film on the other side via a conveyor assembly. The lamination device then clamps the PA and PP films onto the surface of the coated aluminum foil to achieve bonding and lamination. Finally, the film is heat-cured, aged, slit, and packaged into finished products.

[0031] In summary, this application includes the following beneficial technical effects:

[0032] Using aluminum foil as the substrate, after chromating and / or plasma surface treatment, a three-roller structure is used to simultaneously transport the aluminum foil and PA / PP films, with the aluminum foil positioned between the PA and PP films. During the transport process, double-sided adhesive is applied to both sides of the aluminum foil. Then, a laminating device is used to press the aluminum foil, PA film, and PV film towards each other, thereby ultimately bonding the PA and PV films to both sides of the aluminum foil in one step. Compared with the laminating operation of existing technologies, this application reduces the number of lamination steps and achieves the lamination preparation process of aluminum-plastic film in a single double-sided lamination, thus improving the lamination efficiency. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the equipment used in a one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries, as disclosed in an embodiment of this application.

[0034] Figure 2 This is a structural schematic diagram in the embodiments of this application used to illustrate the positional relationship between the coating roller and the glue supply assembly.

[0035] Figure 3 This is a cross-sectional view in the embodiment used to illustrate the positional relationship between the interior of the glue storage box and the push plate.

[0036] Figure 4 This is a schematic diagram used in the embodiment to illustrate the connection relationship between the push plate and the docking rod.

[0037] Figure 5 This is a schematic diagram illustrating the structure of the driving component in the embodiment.

[0038] Figure 6 This is a cross-sectional view used in the embodiment to illustrate the connection relationship between the push plate and the docking rod.

[0039] Explanation of reference numerals in the attached drawings: 1. Aluminum foil pretreatment device; 2. Glue supply assembly; 21. Glue storage box; 211. Glue outlet; 212. Glue outlet gap; 22. Glue application roller; 23. Second rotating component; 24. Push plate; 241. Support ring; 3. Glue coating roller; 31. Conveying gap; 4. Laminating device; 41. Clamping plate; 42. Moving assembly; 421. Frame; 422. Elastic component; 423. Pushing protrusion; 43. Heating component; 5. Conveying assembly; 51. 52. Bracket; 53. Unwind roller; 54. Take-up roller; 55. First rotating component; 56. Transmission gear; 57. Motor; 58. Support roller; 69. Glue pushing assembly; 60. Connecting rod; 611. Slot; 612. Limiting spring; 62. Connecting gear; 63. Connecting rack; 64. Connecting cam; 65. Sliding frame; 66. Reset component; 67. Drive component; 671. Insert rod; 672. Reset spring; 673. Drive plate; 674. Drive gear. Detailed Implementation

[0040] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0041] This application discloses the equipment used in a one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries. (Refer to...) Figure 1 The equipment is arranged sequentially along a preset conveying direction (as shown by arrow A in the figure), including an aluminum foil pretreatment device 1, an adhesive supply assembly 2, two adhesive coating rollers 3, and a laminating device 4; it also includes a conveying assembly 5, which is used to convey aluminum foil along the preset conveying direction. The aluminum foil pretreatment device 1 is used to sequentially perform chromating treatment and / or plasma surface treatment on the aluminum foil. The aforementioned two treatment operations are existing technologies and will not be described in detail here. The adhesive supply assembly 2 is used to apply adhesive to the surfaces of the two adhesive coating rollers 3. A conveying gap 31 is reserved between the two adhesive coating rollers 3, which is only for the aluminum foil to pass through. The conveying assembly 5 is used to drive the two adhesive coating rollers 3 to rotate, thereby achieving double-sided adhesive coating on the aluminum foil during the conveying process. The conveying assembly 5 is also used to convey a PA film along the preset conveying direction on one side of the aluminum foil and a PV film along the preset conveying direction on the other side of the aluminum foil. The laminating device 4 is used to press the aluminum foil, PA film, and PV film in a direction that brings them closer together, so that the PA film and PV film are bonded and laminated to both sides of the aluminum foil.

[0042] Reference Figure 1 The conveying assembly 5 includes a support 51, three unwinding rollers 52 rotatably connected to the support 51, and a take-up roller 53, as well as a first rotating component 54 for driving the unwinding rollers 52 and the take-up roller 53 to rotate. The unwinding rollers 52 are used to unwind aluminum foil, PA film, and PV film, and the take-up roller 53 is located at one end of the laminating device 4 away from the coating roller 3 for bonding the PA film, PV film, and aluminum foil together. Specifically, the first rotating component 54 can be a motor installed at the end of the take-up roller 53 and the unwinding roller 52.

[0043] Reference Figure 1 The conveying assembly 5 also includes two meshing conveying gears 55 and a motor 56 disposed at the end of one of the coating rollers 3. The conveying gears 55 are arranged one-to-one with the coating rollers 3, and the conveying gears 55 are fixedly sleeved on the corresponding ends of the coating rollers 3. The two coating rollers 3 are rotated in opposite directions by starting the motor 56. In addition, the conveying assembly 5 also includes a support roller 57, which is located on the side of one coating roller 3 away from the other coating roller 3. The support roller 57 is rotatably connected to the bracket 51, and a motor can also be disposed on the bracket 51 to drive the rotation of the support roller 57. The support roller 57 is mainly used to support PA film or PV film during conveying.

[0044] Reference Figure 2 and Figure 3 Each coating roller 3 corresponds to a glue supply assembly 2, and each glue supply assembly 2 includes a glue storage box 21, a glue transfer roller 22, and a second rotating component 23. The glue storage box 21 contains glue and is a hollow cylinder. A glue outlet 211 is provided through the side wall of the glue storage box 21 near the corresponding coating roller 3 to connect to its internal cavity. The glue transfer roller 22 is rotatably connected to the inner wall of the glue outlet 211. The second rotating component 23 can be a motor connected to the end of the glue transfer roller 22 to drive its rotation. A glue outlet gap 212 is reserved between the inner wall of the glue outlet 211 and the glue transfer roller 22. The glue transfer roller 22 is arranged parallel to the length of the corresponding coating roller 3, and its surface is in contact with the surface of the corresponding coating roller 3. Glue adheres to the surface of the glue transfer roller 22, and during rotation, the glue is applied to the coating roller 3, thus achieving glue supply.

[0045] Reference Figure 3 and Figure 4 Each glue storage box 21 is provided with two push plates 24. The two push plates 24 are symmetrically distributed with the glue outlet 211 as the center. One end of each push plate 24 is fixedly connected to a support ring 241. The support ring 241 is set with the center of the glue storage box 21 and is rotatably connected to the end wall of the glue storage box 21.

[0046] Reference Figure 2 , Figure 3 and Figure 5 The glue storage box 21 is also equipped with a glue pushing assembly 6, which is used to drive each push plate 24 to slide back and forth along the inner wall of the glue storage box 21 (i.e., as shown in the figure). Figure 3 The adhesive ejector 211 slides back and forth in the direction indicated by the dashed arrow, and the ejector 211 is located on the sliding path of the pusher plate 24. Specifically, the adhesive ejector assembly 6 includes a docking rod 61, a docking gear 62, and a docking rack 63, which are arranged one-to-one with the pusher plate 24. The adhesive ejector assembly 6 also includes a docking cam 64, a sliding frame 65, and a reset member 66.

[0047] Reference Figure 2 , Figure 3 and Figure 5 Two docking cams 64 can be provided and fixedly sleeved on the ends of the corresponding glue-spreading rollers 22. The sliding frame 65 is slidably connected to the outer wall of the corresponding glue storage box 21. The reset member 66 can be a spring. The reset member 66 is connected between the sliding frame and the outer wall of the glue storage box 21, and the extension and retraction direction of the reset member 66 is parallel to the sliding direction of the sliding frame 65. When the reset member 66 is not deformed, the sliding frame 65 is located in the rotation direction of the docking cam 64. When the docking cam 64 rotates and abuts against the sliding frame 65, the sliding frame 65 can be moved away from the glue storage box 21 by the pushing force.

[0048] Reference Figure 2 , Figure 3 and Figure 5 Both docking racks 63 are fixedly connected to the end of the sliding frame 65, and the docking racks 63 are meshed with the corresponding docking gears 62. The docking gears 62 are fixedly sleeved on the corresponding docking rods 61. One docking rod 61 is rotatably connected to the center position of one end wall of the glue storage box 21, and the other docking rod 61 is rotatably connected to the center position of the other end wall of the glue storage box 21.

[0049] Reference Figure 5 and Figure 6 Each connecting rod 61 has a slot 611 on one side wall inside the glue storage box 21 for inserting a corresponding push plate 24. One end of the push plate 24 is inserted into the slot 611, and the push plate 24 can slide back and forth along the length of the slot 611. A limit spring 612 is fixedly connected between the push plate 24 and the slot 611. The extension and contraction direction of the limit spring 612 is parallel to the length direction of the slot 611 to limit the sliding of the push plate 24. When the limit spring 612 is not deformed, the push plate 24 does not contact the inner wall of the glue storage box 21. The glue storage box 21 is also provided with a driving member 67, which is provided one-to-one with the connecting rod 61. The driving member 67 is used to drive the push plate 24 to slide relative to the length direction of the slot 611 so that the end of the push plate 24 can contact the inner wall of the glue storage box 21.

[0050] Reference Figure 5 and Figure 6The driving component 67 includes a plug rod 671, a return spring 672, a driving plate 673, and a driving gear 674. One end of the plug rod 671 is slidably connected to the corresponding mating rod 61. The return spring 672 is fixedly connected between the plug rod 671 and the mating rod 61, and the extension and retraction direction of the return spring 672 is parallel to the sliding direction of the plug rod 671 relative to the mating rod 61. When the return spring 672 is not deformed, the end wall of the plug rod 671 is in contact with the end wall of the push plate 24. The other end of the insertion rod 671 is located outside the docking rod 61. The drive plate 673 and the drive gear 674 are coaxially rotatably connected to the outer wall of the glue storage box 21. The drive gear 674 is used to mesh with the docking rack 63. When the return spring 672 is not deformed, the insertion rod 671 is located on the rotation path of the drive plate 673. In addition, the number of teeth of the drive gear 674 satisfies the following: when the docking rack 63 is pushed by the docking cam 64 and moves away from the docking cam 64, in this direction of movement, the docking rack 63 moves from approaching the drive gear 674, to meshing with the drive gear 674, and then disengaging from the drive gear 674. This allows the drive plate 673 to cover the end of the docking rod 61, that is, to make the end of the push plate 24 adhere to the inner wall of the glue storage box 21. After that, the docking rack 63 will continue to move a distance away from the docking cam 64 before sliding in the opposite direction.

[0051] Reference Figure 1 The composite device 4 includes two clamping plates 41, a moving component 42, and a heating element 43. The moving component 42 includes a frame 421, an elastic element 422, and a pushing protrusion 423. One clamping plate 41 is fixedly installed on the frame 421, and the other clamping plate 41 is a movable clamping plate 41. The movable clamping plate 41 slides towards or away from the other clamping plate 41 and is connected to the frame 421. The elastic element 422 can be a spring. The elastic element 422 is connected between the movable clamping plate 41 and the frame 421, and the extension and retraction direction of the elastic element 422 is parallel to the sliding direction of the movable clamping plate 41.

[0052] Reference Figure 1A clamping gap is reserved between the two clamping plates 41 to allow aluminum foil, PA film, and PV film to pass through simultaneously; the push-up protrusion 423 is fixedly connected to the surface of the take-up roller 53, and when the elastic element 422 is not deformed, the movable clamping plate 41 is located on the rotation path of the push-up protrusion 423. The push-up protrusion 423 is used to push the movable clamping plate 41 during rotation, so that the movable clamping plate 41 moves towards the other clamping plate 41 and clamps the aluminum foil, PA film, and PV film, so that the PA film and PV film abut against both sides of the aluminum foil to achieve adhesive bonding. In addition, the heating element 43 can be an electric heating wire embedded on one side of the two clamping plates 41 close to each other. The electric heating wire generates heat by passing electricity through it to heat the clamping gap, thereby heating and curing the aluminum foil, PA film and PV film that are bonded together, thus improving the stability. In another embodiment, the heating element 43 can also be an air-floating oven installed on the frame 421. The composite device 4 is inserted into the air-floating oven to achieve heating during the composite process.

[0053] The implementation principle of the equipment used in the one-step dry lamination process of aluminum-plastic film double-sided coating for soft-pack batteries disclosed in this application is as follows: Unwind aluminum foil, perform chromating treatment and / or plasma surface treatment on aluminum foil through aluminum foil pretreatment device 1, then pass the aluminum foil through the conveying gap 31, and simultaneously drive the coating roller 3 to rotate. The two coating rollers 3 rotate in opposite directions to convey the aluminum foil and apply adhesive to both sides of the aluminum foil surface. At this time, PA film and PV film are unwound and conveyed on both sides of the aluminum foil, so that the aluminum foil, PA film and PV film pass through the clamping gap at the same time and are squeezed and bonded to achieve lamination. Finally, the laminated finished product is wound onto the take-up roller 53 to achieve take-up, and at the same time, the take-up roller 53 can also realize the subsequent conveying of PA film and PV film.

[0054] During the glue application process, the rotation of the glue-applying roller 22 drives the sliding frame 65 to slide back and forth. When the sliding frame 65 slides away from the glue-applying roller 22, the two push plates 24 will partially extend out of the corresponding slots 611 and fit against the inner wall of the glue storage box 21, and move towards the glue outlet 211. When the docking cam 64 rotates to disengage from the sliding frame 65, the sliding frame 65 moves towards the glue-applying roller 22 under the drive of the reset member 66, and causes the docking rod 61 to reverse, thereby driving the two push plates 24 to move away from the glue outlet 211. At this time, the drive plate 673 rotates away from the docking rod 61 and releases the push against the insertion rod 671. The insertion rod 671 slides and releases the push against the push plate 24, so that the push plate 24 is partially retracted into the slot 611, so that the end of the push plate 24 is disengaged from the inner wall of the glue storage box 21.

[0055] This application also discloses a one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries, comprising the following steps:

[0056] Step 101, aluminum foil pretreatment: unwind aluminum foil and perform chromating treatment and / or plasma surface treatment on the aluminum foil.

[0057] In practice, the time for the aluminum foil to pass through the chromating bath during unwinding can be 1–300 seconds, with 30–120 seconds being preferred. In this embodiment, 60 seconds is selected.

[0058] Step 102, double-sided adhesive coating: The pre-treated aluminum foil is conveyed by the conveying assembly 5 and the adhesive coating roller 3, and adhesive is applied to both sides of the aluminum foil during the conveying process.

[0059] In practice, the conveying component 5 can convey PA film and PV film at a speed of 0.5 m / s to 10 m / s, preferably 3 to 8 m / s. In this embodiment, 5 m / s is selected.

[0060] Step 103, lamination: PA film is conveyed on one side of aluminum foil and PP film is conveyed on the other side by conveying component 5. The PA film and PP film are respectively clamped on the surface of the coated aluminum foil by lamination device 4 to achieve bonding and lamination. Then, heat curing, curing, cutting and boxing are carried out to form finished products.

[0061] In practice, the heat curing method can be to transfer the composite aluminum foil, PA film, and PV film to an air-floating oven.

[0062] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. Equipment used in a one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries, comprising an aluminum foil pretreatment device (1), wherein the aluminum foil pretreatment device (1) is used to perform chromating treatment and / or plasma surface treatment on the aluminum foil; characterized in that: It also includes a conveying assembly (5), an adhesive supply assembly (2), a laminating device (4), and at least two adhesive coating rollers (3); the adhesive supply assembly (2) is used to apply adhesive to the surfaces of the two adhesive coating rollers (3), and a conveying gap (31) is reserved between the two adhesive coating rollers (3) for aluminum foil to pass through; the conveying assembly (5) is used to drive the adhesive coating rollers (3) to rotate so that the aluminum foil passes through the conveying gap (31) along a preset conveying direction, and the conveying assembly (5) is also used to convey PA film and PV film along the preset conveying direction; the adhesive coating rollers (3) and the laminating device (4) are arranged sequentially along the conveying direction, and the laminating device (4) is used to simultaneously squeeze the aluminum foil, PA film, and PV film toward each other; Each of the glue-applying rollers (3) corresponds to a glue-supplying assembly (2), which includes a glue storage box (21) and a glue-applying roller (22). The side wall of the glue storage box (21) is provided with a glue outlet (211) for communicating with the inner cavity of the glue storage box (21). The glue-applying roller (22) is rotatably connected to the inner wall of the glue outlet (211), and a glue outlet gap (212) is reserved between the glue-applying roller (22) and the inner wall of the glue outlet (211). The glue-applying roller (22) is in contact with the surface of the corresponding glue-applying roller (3). The glue storage box (21) is provided with a push plate (24). The push plate (24) is slidably connected to the glue storage box (21) in a direction close to or away from the glue outlet (211). The glue outlet (211) is located on the sliding path of the push plate (24). The glue storage box (21) is also provided with a glue pushing assembly (6). The glue pushing assembly (6) is used to drive the push plate (24) to slide, so that the push plate (24) will hang the glue on the inner wall of the glue storage box (21) to the glue outlet (211) when sliding.

2. The equipment used in the one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries according to claim 1, characterized in that: The composite device (4) includes two clamping plates (41), a moving component (42), and a heating element (43). A clamping gap is reserved between the two clamping plates (41) for aluminum foil, PA film, and PV film to pass through. The moving component (42) is used to drive the two clamping plates (41) to move towards each other or away from each other. The heating element (43) is used to heat the clamping gap.

3. The equipment used in the one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries according to claim 2, characterized in that: The moving component (42) includes a frame (421), an elastic element (422), and a pusher (423); the conveying component (5) includes a take-up roller (53) rotatably connected to the frame (421) and a first rotating element (54) for driving the take-up roller (53) to rotate; the composite device (4) and the take-up roller (53) are arranged sequentially along the conveying direction, and the pusher (423) is disposed on the side wall of the take-up roller (53); One of the clamping plates (41) is fixed relative to the frame (421), and the other clamping plate (41) is a movable clamping plate (41). The movable clamping plate (41) is slidably connected to the frame (421). The elastic element (422) is used to drive the movable clamping plate (41) to move away from the other clamping plate (41). When the elastic element (422) is not deformed, the movable clamping plate (41) is located on the rotation path of the push-up protrusion (423). The push-up protrusion (423) is used to drive the movable clamping plate (41) to move closer to the other clamping plate (41) during rotation.

4. The equipment used in the one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries according to claim 1, characterized in that: The glue supply assembly (2) also includes a second rotating component (23) for driving the glue-spreading roller (22) to rotate.

5. The equipment used in the one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries according to claim 1, characterized in that: There are two push plates (24), which are distributed on the inner walls of the glue storage box (21) on both sides of the glue outlet (211); the glue pushing assembly (6) includes a docking rod (61), a docking cam (64), a sliding frame (65), a reset component (66), a docking gear (62), and a docking rack (63); the docking rod (61), the docking cam (64), the docking gear (62), and the docking rack (63) are all arranged in a one-to-one correspondence with the push plate (24); The push plate (24) is connected to the corresponding docking rod (61), the docking rod (61) is rotatably connected to the inner end wall of the glue storage box (21), and when the push plate (24) rotates around the corresponding docking rod (61), the push plate (24) always fits against the inner wall of the glue storage box (21); the docking gear (62) is sleeved on the corresponding docking rod (61), the docking rack (63) meshes with the corresponding docking gear (62), and all the docking racks (63) All are connected to the sliding frame (65). The docking cam (64) is sleeved on the corresponding rubber transfer roller (22). The docking cam (64) is used to push the sliding frame (65) when rotating with the rubber transfer roller (22), so that the sliding frame (65) slides away from the rubber transfer roller (22). The sliding direction is parallel to the length direction of the docking rack (63). The reset member (66) is used to drive the sliding frame (65) to slide closer to the rubber transfer roller (22).

6. The equipment used in the one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries according to claim 5, characterized in that: The side wall of the docking rod (61) is provided with a slot (611) for inserting the corresponding push plate (24). The push plate (24) slides along the length direction of the slot (611) and is connected to the inner wall of the corresponding slot (611). A limit spring (612) is connected between the inner wall of the slot (611) and the push plate (24). The length direction of the limit spring (612) is parallel to the length direction of the slot (611). When the limit spring (612) is not deformed, the end of the push plate (24) away from the docking rod (61) is not attached to the inner wall of the glue storage box (21). The glue storage box (21) is also provided with a driving member (67). The driving member (67) is used to drive the push plate (24) to slide relative to the length direction of the slot (611) so that the end of the push plate (24) away from the docking rod (61) is attached to the inner wall of the glue storage box (21).

7. The equipment used in the one-step dry lamination process for double-sided coating of aluminum-plastic film for soft-pack batteries according to claim 6, characterized in that: The driving component (67) is provided in a one-to-one correspondence with the docking rod (61). The driving component (67) includes a plug rod (671), a return spring (672) sleeved on the plug rod (671), a driving plate (673) rotatably connected to the glue storage box (21), and a driving gear (674) coaxially arranged on the driving plate (673). One end of the insertion rod (671) slides toward or away from the slot (611) and is connected to the corresponding docking rod (61). When the return spring (672) is not deformed, the other end of the insertion rod (671) is located on the rotation path of the drive plate (673). When the limiting spring (612) is not deformed, the end of the push plate (24) is located on the sliding path of the insertion rod (671). The drive gear (674) meshes with the docking rack (63). The drive plate (673) is used to push the insertion rod (671) when rotating toward the insertion rod (671) so that the insertion rod (671) pushes the end of the push plate (24).

8. A one-step dry lamination process for double-sided coating of aluminum-plastic film for pouch batteries, applied to the equipment used in the one-step dry lamination process for double-sided coating of aluminum-plastic film for pouch batteries as described in claim 1, characterized in that: Includes the following steps: Aluminum foil pretreatment: unwind aluminum foil, and perform chromating treatment and / or plasma surface treatment on the aluminum foil; Double-sided coating: The pre-treated aluminum foil is conveyed by a conveying assembly (5) and a coating roller (3), and the aluminum foil is coated with adhesive on both sides during the conveying process; Composite: PA film is conveyed on one side of aluminum foil and PP film is conveyed on the other side by conveying component (5). The PA film and PP film are clamped on the surface of the coated aluminum foil by the composite device (4) to achieve bonding and composite. Then, the aluminum foil is heated, cured, slit and packaged into finished products.

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