A method and a machine for packaging a battery cell with a concave cavity film

Abstract

The application discloses a battery cell packaging method and packaging machine for concave cavity film pasting, and relates to the technical field of battery production; the method comprises the following steps: conveying an aluminum plastic film piece material with a concave cavity after punching and forming to a preset film pasting station through a first conveying mechanism; conveying a release paper material belt with the first film material attached to the preset film pasting station through a second conveying mechanism, so that the first film material is aligned above the aluminum plastic film piece material; controlling a hot pressing mechanism to move to the preset film pasting station, driving a hot pressing plate to move downward and apply a preset pressure and a preset temperature, so that the first film material is pasted and fixed to a preset film pasting position of the aluminum plastic film piece material; according to the application, the local film pasting thickening at the edge of the aluminum plastic film punching can reduce the overall thickness of the aluminum plastic film under the premise of ensuring the sealing performance and the sealing strength, increase the effective volume of the concave cavity, improve the battery capacity, realize automatic production, and reduce the material and energy consumption costs.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a method and machine for packaging battery cells using concave cavity film. Background Technology

[0002] In existing linear packaging machines used for lithium-ion battery cell encapsulation, aluminum-plastic film sheets are directly transferred to subsequent processing stations after being punched and formed. The punching and forming of the aluminum-plastic film creates a pocket structure to accommodate the battery cell. The thickness of the aluminum-plastic film in this pocket area is a key factor determining the usable space inside the battery. Understandably, the polypropylene (PP) layer of the aluminum-plastic film needs to meet performance requirements such as sealing and the strength of the punched edge structure, thus requiring a certain thickness specification. In traditional methods, the PP layer thickness of the aluminum-plastic film sheet directly meets these requirements after punching and forming, allowing it to proceed directly to the next processing step. However, this limitation restricts the adjustment of the aluminum-plastic film thickness. When the overall thickness of the aluminum-plastic film is too large, the effective depth and volume of the pocket formed after punching and forming will be correspondingly limited, squeezing the space inside the battery to accommodate the active material of the battery cell, becoming a technical bottleneck restricting further increases in battery capacity. Summary of the Invention

[0003] The purpose of this application is to provide a method and machine for packaging battery cells using cavity film application, in order to solve at least one of the above-mentioned technical problems.

[0004] In a first aspect, this application provides a method for packaging battery cells using cavity film, comprising the following steps: The aluminum-plastic film sheet with concave cavity, after being punched and formed, is conveyed to the preset film-applying station by the first conveying mechanism. The release paper strip with the first film attached is conveyed to the preset film application station by the second conveying mechanism, so that the first film is aligned with the aluminum-plastic film sheet. The hot pressing mechanism is controlled to move to the preset film-applying station, and the hot pressing plate is driven to move downward and act on the release paper strip and the aluminum-plastic film sheet, so that the first film is adhered and fixed to the preset film-applying position of the aluminum-plastic film sheet.

[0005] Preferably, the step of conveying the perforated aluminum-plastic film sheet with a concave cavity to the preset laminating station via the first conveying mechanism includes: Real-time acquisition of aluminum-plastic film position information at the feeding station and the preset film application station; When the aluminum-plastic film position information of the preset film application station is detected to be empty and the aluminum-plastic film position information of the loading station is detected to be in place, the first conveying mechanism is triggered to start, and the aluminum-plastic film sheet is conveyed from the loading station to the film application station to complete the positioning.

[0006] Preferably, the step of conveying the release paper strip with the first film attached to the laminating station via the second conveying mechanism, so that the first film is aligned with the aluminum-plastic film sheet, includes: The cavity position information of the aluminum-plastic film at the preset film application station is obtained in real time. Adjust the alignment offset of the second conveying mechanism according to the cavity position information; Based on the alignment offset, the second conveying mechanism is controlled to adjust the conveying position so that the preset film-applying positions of the first film material and the aluminum-plastic film material are aligned along the bonding direction.

[0007] Preferably, the control hot-pressing mechanism moves to the preset film-applying station, driving the hot-pressing plate downwards to act on the release paper strip and the aluminum-plastic film sheet, so that the first film is adhered and fixed to the preset film-applying position of the aluminum-plastic film sheet, including: Control the hot press plate of the hot press mechanism to move to a preset position above the preset film application station; The hot press plate is controlled to move downwards until it contacts the surface of the release paper, and a preset bonding pressure is applied to the first film material and the aluminum-plastic film material. The hot plate is controlled to maintain at a preset bonding temperature and pressure for a preset duration. After that, the hot plate is driven to move upward and reset.

[0008] Preferably, the battery cell packaging method further includes: The aluminum-plastic film sheet after hot pressing is cooled and shaped to ensure stable adhesion between the first film material and the aluminum-plastic film. Drive the peeling mechanism to cut into the bonding interface between the first film material and the release paper, and completely peel the release paper off the surface of the first film material. The aluminum-plastic film sheet that has been applied and peeled off is transported from the preset application station to the next process via the first conveying mechanism.

[0009] Preferably, the take-up roller of the second conveying mechanism is controlled to take up the release paper of a preset length, while the release roller releases the release paper strip of the corresponding length, which is attached with the first film material. After the release paper strip is delivered to the designated position, it is locked in place, so that the next section of the first film material is aligned with the film application station, thus completing the material preparation.

[0010] Preferably, the first film material is aligned with the annular area of ​​the perforated edge of the aluminum-plastic film sheet, and the coverage area of ​​the first film material matches the annular area of ​​the perforated edge to be covered with film.

[0011] Secondly, this application provides a packaging machine, including a frame, a first conveying mechanism, a second conveying mechanism, a hot pressing mechanism, and a peeling mechanism; The frame is provided with a film-applying station, and the first conveying mechanism is arranged on the frame along the conveying direction, configured to convey the aluminum-plastic film sheet with concave cavity after punching to the film-applying station. The second conveying mechanism is located above the film-applying station and is configured to convey the release paper strip with the first film material attached to the film-applying station and align the first film material with the edge area of ​​the perforation of the aluminum-plastic film sheet. The hot pressing mechanism is vertically mounted above the film-applying station and is configured to apply pressure downwards via a hot pressing plate to thermally bond the first film material to the surface of the aluminum-plastic film sheet. The peeling mechanism is located on the discharge side of the film-applying station and is configured to peel the release paper from the surface of the first film material after it has been applied.

[0012] Preferably, the first conveying mechanism includes The conveying module includes an intermittently arranged loading conveyor line and unloading conveyor line; The transfer module includes a first return component and a second return component respectively disposed at both ends of the conveying module, for transferring the bearing component between the feeding conveyor line and the unloading conveyor line to form a circulating return path; The supporting component is used to support the aluminum-plastic film body, and the film application station is located on the conveying path of the feeding conveyor line; The feeding conveyor line is adapted to transport the aluminum-plastic film body to the film application station via the bearing component.

[0013] Preferably, the hot pressing mechanism includes a first driving member and a hot pressing plate disposed at the driving end of the first driving member; The first driving member is adapted to drive the hot press plate to move so as to press the film material and the aluminum-plastic film body located at the film application station.

[0014] Preferably, the peeling mechanism includes a second driving member and a peeling member disposed at the driving end of the second driving member; The second driving member drives the peeling member to move so as to act on the bonding interface between the first film material and the release paper.

[0015] Compared with existing technologies, the beneficial effects of this application are as follows: This battery cell packaging method achieves localized film thickening at the edge of the punched cavity by conveying and positioning the perforated aluminum-plastic film, aligning and conveying the release paper with the first film material attached above the aluminum-plastic film, and then hot-pressing to adhere the first film material to the preset position of the aluminum-plastic film. This method can reduce the overall thickness of the aluminum-plastic film while ensuring the sealing strength and sealing performance, effectively increasing the effective volume of the cavity and improving the battery capacity; localized film application can reduce the amount of film material used, shorten the hot-pressing and holding time, increase production cycle time, reduce material costs and equipment energy consumption, and has strong process controllability, accurate film alignment, and stable bonding quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a packaging machine according to one embodiment of this application; Figure 2 This is a schematic diagram of the structure of a packaging machine according to one embodiment of this application; Figure 3 This is a schematic diagram of the structure of a packaging machine according to one embodiment of this application; Figure 4 This is a partial structural schematic diagram of the first conveying mechanism according to one embodiment of this application; Figure 5 This is a schematic diagram of the structure of a transfer module according to one embodiment of this application; Figure 6 This is a schematic diagram of the hot pressing mechanism according to one embodiment of this application; Figure 7 This is a schematic diagram of the structure of the peeling member according to one embodiment of this application; Wherein: 10, First conveying mechanism; 11, Conveying module; 111, Feeding conveyor line; 1111, Magnetic levitation slide rail; 1112, Mover; 112, Unloading conveyor line; 113, Bearing component; 12, Transfer module; 121, First return component; 1211, Third driving component; 1212, Connecting slide rail; 122, Second return component; 20, Second conveying mechanism; 21, Rewinding structure; 22, Unwinding structure; 23, Guide roller; 30, Hot pressing mechanism; 31, Film application station; 32, Hot pressing plate; 33, First driving component; 34, Guiding unit; 35, Mounting frame; 40, Peeling mechanism; 41, Peeling component; 411, Mounting plate; 412, Peeling knife; 4121, Air hole; 42, Second driving component. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] In the description of this application, it should be understood that the terms "upper", "lower", "side", "front", "rear", etc., indicate the orientation or positional relationship based on the installation orientation or positional relationship, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] In the description of this application, it should be noted that the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0023] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0024] To further understand the invention's content, features, and effects, the following embodiments are provided, along with detailed descriptions in conjunction with the accompanying drawings: In existing linear packaging machines used for lithium battery cell encapsulation, aluminum-plastic film sheets are directly transferred to subsequent processing stations after being punched and formed. After punching, the aluminum-plastic film forms a pocket structure to accommodate the battery cell. The thickness of the aluminum-plastic film in this pocket area is a key factor determining the usable space inside the battery. Understandably, the polypropylene (PP) layer of the aluminum-plastic film needs to meet performance requirements such as sealing and the strength of the punched edge structure, thus requiring a certain thickness specification. In traditional methods, the PP layer thickness of the aluminum-plastic film sheet directly meets the corresponding requirements after punching and is therefore directly transferred to the next processing step. However, due to this limitation, there is no room for adjusting the thickness of the aluminum-plastic film in traditional methods. When the overall thickness of the aluminum-plastic film is too large, the effective depth and volume of the pocket formed after punching will be correspondingly limited, squeezing the space inside the battery to accommodate the active material of the battery cell, becoming a technical bottleneck restricting further increases in battery capacity. To solve the above technical problems, this application provides the following technical solution: Example 1 This embodiment provides a packaging machine, including a frame, a first conveying mechanism 10, a second conveying mechanism 20, a hot pressing mechanism 30, and a peeling mechanism 40; Specifically, a film-applying station 31 is provided on the frame, and the first conveying mechanism 10 is arranged on the frame along the conveying direction, configured to convey the aluminum-plastic film sheet with concave cavity after punching to the film-applying station 31. Specifically, the second conveying mechanism 20 is located above the film application station 31 and is configured to convey the release paper strip with the first film material attached to the film application station 31 and align the first film material with the edge area of ​​the perforation of the aluminum-plastic film sheet. It is understood that, in some implementations, the first film material can be understood as a PP film.

[0025] Specifically, the hot pressing mechanism 30 is vertically mounted above the film application station 31 and is configured to apply pressure downward through the hot pressing plate 32 to thermally bond the first film material to the surface of the aluminum-plastic film material. In this scheme, the first conveying mechanism 10 carries and conveys the aluminum-plastic film sheet with concave cavity, transfers the aluminum-plastic film sheet to be processed to the film laminating station 31, and sends the finished product out of the film laminating station 31 after the film laminating operation is completed; the second conveying mechanism 20 is used to convey the release paper strip with PP film attached to the film laminating station 31; the hot pressing mechanism 30 is set corresponding to the film laminating station 31, and is used to apply pressure and heat to the stacked release paper strip and the aluminum-plastic film body, so that the PP film is heated and bonded to the surface of the aluminum-plastic film body, thus completing the film laminating operation. Understandably, this solution achieves automated film coating by coordinating the alignment of the first conveying mechanism 10 and the second conveying mechanism 20 at the film coating station 31, in conjunction with the hot pressing mechanism 30. This replaces the traditional direct-feed packaging process without film coating, and increases the thickness of local areas of the aluminum-plastic film (the edge area of ​​the perforated area of ​​the aluminum-plastic film sheet). This solution provides equipment support for the new process of "overall thinning of aluminum-plastic film + local film coating and thickening", and breaks through the limitation of the traditional aluminum-plastic film thickness on the cavity volume while ensuring the strength of the aluminum-plastic film.

[0026] Furthermore, this solution involves locally thickening a specific area—the edge of the perforated section of the aluminum-plastic film sheet. This area is precisely where the top and side seals are applied during subsequent cell encapsulation, making it a core area for ensuring battery sealing performance and structural strength. By thickening this area with film, the material thickness at the seal meets the encapsulation process requirements, ensuring seal strength, sealing reliability, and bending resistance, thus avoiding the risk of leakage or cracking due to material thinning at the seal. The core receiving area at the bottom of the cavity is left unfilmed, retaining the thinned aluminum-plastic film, thereby maximizing the effective depth and internal volume of the cavity. This allows all the space gained from thinning the aluminum-plastic film to be converted into filling space for the cell's active materials, maximizing battery capacity. Simultaneously, the localized closed-loop film application significantly reduces the amount of PP film used, directly lowering the material cost per product. The smaller film area also shortens the hot-pressing and holding time, increasing the production cycle time per station and reducing equipment energy consumption.

[0027] Specifically, the peeling mechanism 40 is located on the discharge side of the film laminating station 31 and is configured to peel the release paper from the surface of the first film material after lamination. Understandably, after hot pressing, the PP film is already bonded to the surface of the aluminum-plastic film, and the release paper, which serves as the substrate, needs to be separated from the PP film and recycled. This solution sets up a peeling mechanism 40 on the discharge side of the film application station 31, which is seamlessly connected with the film material conveying and hot pressing processes. After hot pressing, the peeling action is performed online directly. The entire process does not require manual intervention and realizes full automation of the "feeding-hot pressing-peeling-receiving" process.

[0028] In some implementations, the peeling mechanism 40 can operate synchronously with the continuous conveying of the film material; this does not occupy the production cycle time and ensures the production efficiency of the entire line. Furthermore, the mechanical peeling force is stable and controllable, and the peeling angle and tension are constant, which can avoid problems such as displacement, wrinkles, and edge warping of the first film caused by pulling during manual peeling, and ensure the accuracy of the film application position and the flatness of the appearance.

[0029] Furthermore, in some embodiments, the peeling mechanism 40 includes a second driving member 42 and a peeling member 41 disposed at the driving end of the second driving member 42; The second driving member 42 drives the peeling member 41 to move so as to act on the bonding interface between the first film material and the release paper. This solution uses a second driving component 42 to drive the peeling component 41, allowing for flexible adjustment of the peeling component 41's cutting depth, cutting angle, and relative position to the film application station 31. Different peeling parameters are adjusted for films of varying thicknesses and adhesive strengths. For example, for high-adhesion films, a smaller peeling angle can be adjusted to reduce peeling force and prevent the first film from being lifted. For thicker films, the cutting depth can be adjusted to ensure thorough delamination. The drive adjustment enables automated control, allowing for one-click parameter adjustment during product changeovers, significantly reducing changeover and debugging time and improving equipment production flexibility.

[0030] In some embodiments, the second drive member 42 may be a single-axis drive member to achieve adjustment in a single direction; in other embodiments, the second drive member 42 may also be a multi-axis drive member to achieve adjustment in multiple directions, while cooperating with the rotation mechanism to achieve angle adjustment.

[0031] For details, please see Figure 7 The peeling member 41 includes a mounting plate 411 and a peeling blade 412 disposed on the mounting plate 411. The mounting plate 411 is connected to the second driving member 42. Furthermore, the peeling knife 412 is provided with several air holes 4121; In this design, the blade area of ​​the peeling blade 412 has several air holes 4121. During operation, a positive pressure clean airflow is introduced. After the airflow is ejected from the air holes 4121, a uniform air film is formed at the peeling interface. On the one hand, this significantly reduces the friction and adhesion between the film and the blade, fundamentally avoiding the phenomenon of the adhesive layer sticking to the blade, ensuring a smooth and stable peeling process, and a smooth film surface without adhesive residue or scratches. On the other hand, the positive pressure airflow can play an auxiliary cooling role on the freshly peeled film surface, accelerating the curing and shaping of the adhesive layer and improving the stability of the bonding strength.

[0032] Furthermore, the peeling blade 412 extends along the width of the film material, enabling full-width peeling in one go, with neat and smooth peeling edges.

[0033] Specifically, the first conveying mechanism 10 includes a conveying module 11 and a transfer module 12; The conveying module 11 includes a feeding conveyor line 111 and a discharging conveyor line 112 arranged at intervals; the transfer module 12 includes a first return component 121 and a second return component 122 respectively arranged at both ends of the conveying module 11, for transferring the bearing component 113 between the feeding conveyor line 111 and the discharging conveyor line 112 to form a circulating return path. Furthermore, the supporting component 113 is used to support the aluminum-plastic film body, and the film application station 31 is located on the conveying path of the feeding conveyor line 111; Specifically, the feeding conveyor line 111 is adapted to transport the aluminum-plastic film body to the film application station 31 via the carrying component 113; In this design, the feeding conveyor line 111 and the unloading conveyor line 112 are arranged in parallel and spaced apart. Together with the first return assembly 121 and the second return assembly 122 at both ends, they form a closed-loop circulation path. The carrier assembly 113 can automatically circulate back and forth between the two conveyor lines without manual intervention. Understandably, the circulation design of the carrier assembly 113 effectively saves the overall footprint of the device, while also effectively improving the utilization rate of the carrier assembly 113, reducing the number of carrier assemblies required, and significantly lowering the processing and maintenance costs of the carrier assembly 113. Furthermore, the film-applying station 31 is located on the feeding conveyor line 111. Feeding, film application, and unloading are sequentially connected along the circulation path, reducing intermediate transfer links. The carrier assembly 113 has higher repeatability and positioning accuracy, effectively ensuring the consistency of the film application position and improving product yield.

[0034] In some embodiments, the support component 113 can be understood as a fixture for loading the aluminum-plastic film body.

[0035] In some embodiments, the specific return process of the fixture is as follows: the empty fixture is at the beginning of the loading conveyor line 111, the upstream mechanism places the aluminum-plastic film body to be coated on the empty fixture, and then the fixture with the aluminum-plastic film body is moved to the coating station 31 by the loading conveyor line 111 to complete the coating. After the coating is completed, the aluminum-plastic film body continues to move to the end of the loading conveyor line 111 under the support of the fixture, and is transferred to the beginning of the unloading conveyor line 112 by the first return component 121. Then, it moves to the end of the unloading conveyor line 112 by the unloading conveyor line 112 and enters the unloading station of the aluminum-plastic film. The transfer mechanism transfers the aluminum-plastic film body placed on the fixture to the next process, thereby switching the current fixture from a loaded state to an empty state. Then, the second return component 122 transfers the empty fixture to the beginning of the loading conveyor line 111 and enters the loading station of the aluminum-plastic film. The above process is repeated thereafter.

[0036] It is understood that the above-described recirculation process is only one of the implementation methods. In other implementation methods, the unloading station of the aluminum-plastic film may be located in the middle part of the unloading conveyor line 112 instead of exactly at its end; and the loading station of the aluminum-plastic film may also be located in the middle section of the loading conveyor line 111 instead of exactly at its beginning section. The specific method can be adjusted according to the actual application requirements.

[0037] For details, please see Figure 5 Both the first return assembly 121 and the second return assembly 122 include a third drive component 1211 and a connecting slide rail 1212; Furthermore, the connecting slide rail 1212 is located at the driving end of the third driving member 1211. The third driving member 1211 is adapted to drive the connecting slide rail 1212 to move along the first direction so that the connecting slide rail 1212 can be connected to the loading or unloading conveying line 112. In some embodiments, the aluminum-plastic film body, after being coated, moves to the end of the feeding conveyor line 111 under the support of the fixture. At this time, the connecting slide rail 1212 of the first return assembly 121 connects with the feeding conveyor line 111. After the fixture enters the connecting slide rail 1212, the third drive member 1211 drives the connecting slide rail 1212 to move laterally, thereby connecting with the unloading conveyor line 112. Subsequently, it enters the starting end of the unloading conveyor line 112. The third drive member 1211 then drives the connecting slide rail 1212 to continue returning to the feeding conveyor line 111. The connection position of the feed line 111 is ready to receive the next fixture; after the fixture enters the end of the unloading conveyor line 112, the connecting slide rail 1212 of the second return assembly 122 connects with the unloading conveyor line 112 so that the fixture can enter the connecting slide rail 1212 of the second return assembly 122. Then, the third drive member 1211 of the second return assembly 122 drives the connecting slide rail 1212 to move laterally so that the connecting slide rail 1212 connects with the loading conveyor line 111 and can then enter the beginning of the loading conveyor line 111.

[0038] Furthermore, in some embodiments, the moving direction of the connecting slide rail 1212 is perpendicular to the material conveying direction.

[0039] This solution adopts a linear translation docking method. The third driving component 1211 directly drives the connecting slide rail 1212 to reciprocate along a direction perpendicular to the conveyor line. The movement path is short and the action response is fast. The connecting slide rail 1212 is precisely docked with the end face of the conveyor line track, and the bearing component 113 slides smoothly along the track.

[0040] In some embodiments, the loading conveyor 111 includes a magnetic levitation slide rail 1111 and a mover 1112 slidably disposed on the magnetic levitation slide rail 1111. It is understood that the fixture is connected to the mover 1112. Furthermore, the connecting slide rail 1212 can also be understood as a separable section of the magnetic levitation slide rail 1111, which can be connected to the magnetic levitation slide rail 1111 of the loading conveyor 111 or the unloading conveyor 112 to support the mover 1112.

[0041] Furthermore, in some embodiments, the third driving member 1211 may be a linear drive motor or other mechanism capable of linear drive, and this embodiment does not limit this.

[0042] Specifically, in some embodiments, the hot pressing mechanism 30 includes a first driving member 33 and a hot pressing plate 32 disposed at the driving end of the first driving member 33; Specifically, the first driving member 33 is adapted to drive the hot press plate 32 to move so as to press the film material and the aluminum-plastic film body located on the film application station 31.

[0043] In some embodiments, after the aluminum-plastic film body arrives at the film application station 31 and the film material is in place, the first driving component 33 can drive the hot press plate 32 to move toward the release paper strip and the aluminum-plastic film body. The hot press plate 32 first acts on the release paper strip and then on the aluminum-plastic film body. The heat on the hot press plate 32 is transferred to the aluminum-plastic film body and the first film material. With the help of pressure, the first film material is bonded to the surface of the aluminum-plastic film body, thus achieving the application of the first film material.

[0044] In some implementations, the hot press plate 32 can be understood as pressing the first film material and the aluminum-plastic film body onto the carrier component 113.

[0045] In some embodiments, the first drive member 33 may be a drive cylinder or other drive mechanism capable of linear drive.

[0046] Furthermore, in some embodiments, the driving direction of the first driving member 33 can be understood as the vertical direction.

[0047] Specifically, in some embodiments, the hot pressing mechanism 30 further includes a mounting frame 35 and a guide unit 34. The first driving member 33 can be understood as being disposed on the mounting frame 35. The guide unit 34 may include a guide post and a guide sleeve. The guide sleeve is disposed on the mounting frame 35, and the guide post is connected to the hot pressing plate 32 to limit the movement of the hot pressing plate 32, so that it moves smoothly in the vertical direction and ensures the hot pressing quality.

[0048] Specifically, the second conveying mechanism 20 includes an unwinding structure 22, a winding structure 21, and several guide rollers 23; Among them, the unwinding structure 22 releases the release paper strip, and the guide roller 23 is used to guide the release paper strip of the unwinding structure 22 to the film application station 31, and after the film application is completed, guide the remaining film to the rewinding structure 21 for rewinding. This solution adopts a roll-to-roll feeding mode. The unwinding structure 22 releases the release paper strip at a uniform speed, and multiple guide rollers 23 are arranged sequentially along the conveying path to tension, guide, and flatten the film material, ensuring that the film material covers the laminating station 31 in a flat and uniform tension state. After lamination, the remaining release paper is guided by the guide rollers 23 and automatically wound up and sorted by the rewinding structure 21, realizing the orderly collection of waste materials without manual cleaning and ensuring the cleanliness of the production site. It is understood that in some embodiments, the remaining strip only contains release paper, such as the PP film attached to the release paper substrate being of a specified shape, and there will be no residue after lamination; in other embodiments, the remaining strip contains release paper and remaining PP film, that is, part of the PP film is bonded to the aluminum-plastic film body, and the rest is wound up together with the release paper substrate.

[0049] Example 2 This embodiment provides a method for packaging battery cells using cavity film.

[0050] The battery cell packaging method provided in this embodiment includes the following steps: Step S1: The aluminum-plastic film sheet with a concave cavity after being punched is conveyed to the preset film application station 31 by the first conveying mechanism 10. In this scheme, the first conveying mechanism 10 carries the aluminum-plastic film sheet through the bearing component 113 and moves it from the feeding conveyor line 111 along the conveying path to the film application station 31.

[0051] In practice, the position information of aluminum-plastic film at the feeding station and the position information of aluminum-plastic film at the preset film application station 31 are collected in real time. When the position information of aluminum-plastic film at the preset film application station 31 is detected to be empty and the position information of aluminum-plastic film at the feeding station is detected to be in place, the first conveying mechanism 10 is triggered to start, and the carrier component 113 carrying the aluminum-plastic film sheet is conveyed from the feeding station to the film application station 31 along the feeding conveyor line 111 to complete the positioning of the aluminum-plastic film sheet. The carrier component 113 is located between the feeding conveyor line 111 and the unloading conveyor line 112, and forms a circulating return path through the first return component 121 and the second return component 122 at both ends. After the aluminum-plastic film sheet is applied, it flows with the carrier component 113 to the unloading station for transfer. The unloaded carrier component 113 then automatically returns to the feeding station, realizing continuous cyclic operation.

[0052] Step S2: The release paper strip with the first film material attached is conveyed to the preset film application station 31 by the second conveying mechanism 20, so that the first film material is aligned with the aluminum-plastic film sheet material. In this scheme, the unwinding structure 22 of the second conveying mechanism 20 releases the release paper strip with the first film attached, which is then guided by the guide roller 23 and conveyed to the top of the laminating station 31.

[0053] In practice, the position information of the cavity of the aluminum-plastic film at the 31 preset film-applying stations is obtained in real time. The alignment offset of the second conveying mechanism 20 is calculated and adjusted based on the cavity position information. Then, the second conveying mechanism 20 is controlled to adjust the conveying position of the material belt based on the alignment offset, so that the preset film-applying positions of the first film and the aluminum-plastic film are accurately aligned along the bonding direction.

[0054] The first film material is aligned with the annular area of ​​the punched edge of the aluminum-plastic film sheet, and the coverage of the first film material matches the annular area to be covered by the film at the edge of the punched edge. Only the sealing area of ​​the subsequent battery cell encapsulation is locally thickened, and the bottom of the cavity remains in the state after the aluminum-plastic film is thinned. While ensuring the sealing strength and sealing performance, the effective volume of the cavity is maximized.

[0055] Step S3: Control the hot pressing mechanism 30 to move to the preset film application station 31, drive the hot pressing plate 32 downward to act on the release paper strip and aluminum-plastic film sheet, so that the first film material is bonded and fixed to the preset film application position of the aluminum-plastic film sheet.

[0056] In this scheme, after the aluminum-plastic film sheet and the first film material are aligned at the film application station 31, the first driving component 33 of the hot pressing mechanism 30 drives the hot pressing plate 32 to perform the hot pressing action.

[0057] The specific process is as follows: First, control the hot press plate 32 to move to the preset standby position above the film application station 31, then control the hot press plate 32 to descend at a uniform speed to contact the surface of the release paper, and apply a preset bonding pressure to the first film material and the aluminum-plastic film material; at the same time, control the hot press plate 32 to maintain at the preset bonding temperature, and after holding the pressure for a preset time, drive the hot press plate 32 to move upward to reset, and complete the single-station hot press bonding.

[0058] During the hot pressing process, the guide unit 34 guides and limits the lifting and lowering movement of the hot press plate 32 to ensure that the pressure is applied evenly to the film application area and avoid problems such as wrinkles, misalignment or uneven adhesion of the film material.

[0059] Step S4: Cool and shape the hot-pressed aluminum-plastic film sheet, drive the peeling mechanism 40 to peel off the release paper, and transport the aluminum-plastic film sheet to the next process.

[0060] In this scheme, after hot pressing, the aluminum-plastic film sheet is first cooled and shaped to fully solidify the bonding layer between the first film and the aluminum-plastic film, ensuring bonding strength and stability. Then, the second driving member 42 of the peeling mechanism 40 drives the peeling member 41 to move, so that the peeling knife 412 cuts into the bonding interface between the first film and the release paper, and completely peels the release paper from the surface of the first film.

[0061] During the peeling process, a series of air holes 4121 on the peeling blade 412 allow positive pressure clean airflow to pass through, forming a uniform air film at the peeling interface. This significantly reduces the friction and adhesion between the film and the blade, preventing the adhesive layer from sticking to the blade and ensuring a smooth peeling process with a clean, residue-free film surface. Furthermore, the positive pressure airflow provides auxiliary cooling to the freshly peeled film surface, accelerating the curing and setting of the adhesive layer. The peeled release paper is then uniformly wound and recycled by the receiving structure.

[0062] Understandably, the cooling and shaping process in this solution can be natural cooling. A fixed natural cooling time can be set according to the actual production situation, and the next step can be performed after the natural cooling time has elapsed.

[0063] After the peeling is completed, the first conveying mechanism 10 drives the carrier component 113 carrying the finished aluminum-plastic film sheet to continue moving along the feeding conveyor line 111, and is transferred to the unloading conveyor line 112 via the first return component 121, and finally conveyed to the next process.

[0064] Step S5: Control the second conveying mechanism 20 to synchronously receive and release materials, completing the preparation of the next section of film material.

[0065] In this scheme, while the film application operation at the current station is completed, the take-up roller of the second conveying mechanism 20 is controlled to take up the release paper of a preset length, and at the same time the release roller releases the release paper strip of the corresponding length with the first film attached. After the strip is delivered to the position, it is locked to stop, so that the next section of the first film is aligned with the film application station 31, and the material preparation is completed. This matches the rhythm of the aluminum-plastic film feeding action in the next cycle, so as to realize continuous production of the whole line.

[0066] The battery cell packaging method in this embodiment achieves precise local film application to the edges of the aluminum-plastic film pits through fully automated control of the entire process, including conveying and alignment, hot pressing and bonding, online peeling, and cyclic material waiting. While ensuring the sealing performance and structural strength, it breaks through the limitation of the overall thickness of the traditional aluminum-plastic film on the cavity volume, effectively increasing the filling space of the active material inside the battery. At the same time, the local film application process reduces the amount of film used, shortens the hot pressing and holding time, increases the production cycle, and reduces production costs and equipment energy consumption.

[0067] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0068] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application shall fall within the scope of the technical solution of this application.

Claims

1. A method for packaging battery cells using cavity film bonding, characterized in that: Includes the following steps: The aluminum-plastic film sheet with a concave cavity after being punched is conveyed to the preset film application station (31) by the first conveying mechanism (10); The release paper strip with the first film attached is conveyed to the preset film application station (31) by the second conveying mechanism (20), so that the first film is aligned with the top of the aluminum-plastic film sheet. The hot pressing mechanism (30) is moved to the preset film application station (31), and the hot pressing plate (32) is driven to move downward and act on the release paper strip and the aluminum-plastic film sheet, so that the first film is bonded and fixed to the preset film application position of the aluminum-plastic film sheet.

2. The battery cell packaging method according to claim 1, characterized in that: The process of conveying the dented aluminum-plastic film sheet with a concave cavity to the preset film-applying station (31) via the first conveying mechanism (10) includes: Real-time acquisition of aluminum-plastic film position information at the feeding station and aluminum-plastic film position information at the preset film application station (31); When the aluminum-plastic film position information of the preset film application station (31) is detected to be empty and the aluminum-plastic film position information of the loading station is detected to be in place, the first conveying mechanism (10) is triggered to start, and the aluminum-plastic film sheet is conveyed from the loading station to the film application station (31) to complete the positioning.

3. The battery cell packaging method according to claim 1, characterized in that: The step of conveying the release paper strip with the first film attached to the laminating station (31) via the second conveying mechanism (20) to align the first film with the aluminum-plastic film sheet includes: The cavity position information of the aluminum-plastic film at the preset film application station (31) is obtained in real time; Adjust the alignment offset of the second conveying mechanism (20) according to the cavity position information; Based on the alignment offset, the second conveying mechanism (20) is controlled to adjust the conveying position so that the preset film-applying positions of the first film material and the aluminum-plastic film material are aligned along the bonding direction.

4. The battery cell packaging method according to claim 1, characterized in that: The control hot pressing mechanism (30) moves to the preset film-applying station (31), driving the hot pressing plate (32) downward to act on the release paper strip and the aluminum-plastic film sheet, so that the first film is adhered and fixed to the preset film-applying position of the aluminum-plastic film sheet, including: Control the hot press plate (32) of the hot press mechanism (30) to move to a preset position above the preset film application station (31); Control the hot press plate (32) to move down to abut against the surface of the release paper, and apply a preset bonding pressure to the first film material and the aluminum-plastic film material; The hot press plate (32) is controlled to maintain at a preset bonding temperature and pressure for a preset time, and then the hot press plate (32) is driven to move upward to reset.

5. The battery cell packaging method according to claim 4, characterized in that: The battery cell packaging method further includes: The aluminum-plastic film sheet after hot pressing is cooled and shaped to ensure stable adhesion between the first film material and the aluminum-plastic film. Drive the peeling mechanism (40) to cut into the bonding interface between the first film material and the release paper, and completely peel the release paper from the surface of the first film material. The aluminum-plastic film sheet that has been applied and peeled off is conveyed from the preset application station (31) to the next process via the first conveying mechanism (10).

6. The battery cell packaging method according to claim 5, characterized in that: The take-up roller of the second conveying mechanism (20) is controlled to take up the release paper of a preset length, while the release roller releases the release paper strip of the corresponding length with the first film attached. After the release paper strip is delivered to the designated position, it is locked in place, so that the next section of the first film material is aligned with the film application station (31), thus completing the material preparation.

7. The battery cell packaging method according to any one of claims 1-6, characterized in that: The first film material is aligned with the annular area of ​​the perforated edge of the aluminum-plastic film sheet, and the coverage area of ​​the first film material matches the annular area of ​​the perforated edge to be covered.

8. A packaging machine, characterized in that: It includes a frame, a first conveying mechanism (10), a second conveying mechanism (20), a hot pressing mechanism (30), and a stripping mechanism (40); The frame is provided with a film application station (31), and the first conveying mechanism (10) is arranged on the frame along the conveying direction, configured to convey the aluminum-plastic film sheet with a concave cavity after punching to the film application station (31). The second conveying mechanism (20) is located above the film application station (31) and is configured to convey the release paper strip with the first film material attached to the film application station (31) and align the first film material with the edge area of ​​the perforation of the aluminum-plastic film sheet. The hot pressing mechanism (30) is vertically mounted above the film application station (31) and is configured to apply pressure downward through the hot pressing plate (32) to thermally bond the first film material to the surface of the aluminum-plastic film material. The peeling mechanism (40) is located on the discharge side of the film application station (31) and is configured to peel the release paper from the surface of the first film material after lamination.

9. The packaging machine according to claim 8, characterized in that: The first conveying mechanism (10) includes The conveying module (11) includes a feeding conveyor line (111) and a discharging conveyor line (112) arranged at intervals; The transfer module (12) includes a first return component (121) and a second return component (122) respectively disposed at both ends of the conveying module (11), for transferring the bearing component (113) between the loading conveyor line (111) and the unloading conveyor line (112) to form a circulating return path; The bearing component (113) is used to support the aluminum-plastic film body, and the film application station (31) is located on the conveying path of the feeding conveyor line (111); The feeding conveyor line (111) is adapted to transport the aluminum-plastic film body to the film application station (31) via the bearing component (113).

10. The packaging machine according to claim 8, characterized in that: The hot pressing mechanism (30) includes a first driving member (33) and a hot pressing plate (32) disposed at the driving end of the first driving member (33); The first driving member (33) is adapted to drive the hot press plate (32) to move to press the film material and the aluminum-plastic film body located on the film application station (31).

11. The packaging machine according to claim 8, characterized in that: The peeling mechanism (40) includes a second driving member (42) and a peeling member (41) disposed at the driving end of the second driving member (42); The second driving member (42) drives the peeling member (41) to move so as to act on the bonding interface between the first film material and the release paper.

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