Composite foil production system and production method

Abstract

The invention discloses a composite foil production system and method, and the system comprises a base material compounding subsystem which is used for pressing a viscous material layer on a base material layer; and / or coating the side opposite to the side where the viscous material layer is pressed on the base material layer with a glue solution to form a glue layer; the viscous material layer comprises an adhesive layer and a peelable layer on one side of the adhesive layer, and the peelable layer is positioned on one side far away from the base material layer after compounding; when the to-be-compounded side of the base material layer is provided with the peelable layer, the peeling assembly is used for peeling the peelable layer on the corresponding side before the base material layer is compounded with the foil layer through the adhesive layer; and the foil compounding subsystem is used for laminating the base material layer so that the base material layer is compounded with the foil layer through the exposed adhesive layer, and guiding and separating the obtained composite foil. The bonding between the base material layer and the adhesive layer can be realized on the premise of ensuring that the performance of the base material layer is basically not lost. According to the composite current collector, the material selection range of the base material layer is expanded, a thinner and lighter composite current collector or a composite current collector with better conductivity can be realized according to requirements, and the composite process is rapid and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of composite foil production, and more specifically, to a composite foil production system and a production method. Background Art

[0002] In the prior art, a production process of composite foils (such as composite current collectors) based on an adhesive layer to achieve the lamination of a substrate layer and a foil layer has been proposed. The adhesiveness on the substrate layer is provided by the adhesive liquid on the substrate layer. In the production of this type of process, an adhesive layer needs to be formed on the substrate layer first. And in the process of forming the adhesive layer on the substrate layer, it often involves the transmission and as much stretching as possible of the substrate layer. Since the thickness of the substrate layer is usually only a few micrometers, such as the currently common ultra-thin films such as PET, PP, and PI; on the one hand, there are often high requirements for the tensile strength, elasticity, etc. of the substrate layer, which limits the selection of the substrate layer materials and the thickness of the substrate layer applicable to this type of process, and is not conducive to the further optimization and development of the composite current collector; on the other hand, when coating the adhesive layer on both sides of the substrate layer, in addition to affecting the production efficiency, in order to coat evenly and sufficiently, the substrate layer needs to be stretched and extended as much as possible each time, and during this process, a certain degree of irreversible damage will be caused to the substrate layer of a few micrometers, affecting the quality of the final product; it may also cause the generation of waste products, affecting the yield.

[0003] Therefore, there is an urgent need for an improved composite foil production system or method that can reduce or avoid the damage to the substrate layer caused by excessive stretching and continuous stretching of the individual substrate, and on this premise, achieve the combination between the substrate layer and the adhesive layer, and facilitate the subsequent lamination with other foil layers. Summary of the Invention

[0004] The present invention aims to overcome at least one of the above-mentioned deficiencies of the prior art, and provides a composite foil production system and a production method, which avoid excessive stretching of the substrate layer and reduce the loss of the mechanical properties of the substrate layer during the pre-treatment process before lamination.

[0005] The technical solution adopted by the present invention is a composite foil production system, comprising: a substrate composite subsystem for laminating an adhesive material layer onto a substrate layer; and / or, coating an adhesive solution on the opposite side of the substrate layer where the adhesive material layer has been laminated to form an adhesive layer; the adhesive material layer includes an adhesive layer and a peelable layer on one side of the adhesive layer, and after lamination, the peelable layer is located on the side away from the substrate layer; a peeling assembly for peeling the corresponding peelable layer on the side of the substrate layer before the substrate layer is laminated with the foil layer through the adhesive layer when there is a peelable layer on the side of the substrate layer to be laminated; a foil composite subsystem for laminating the substrate layer so that it is laminated with the foil layer through the exposed adhesive layer and guiding away the obtained composite foil. The substrate composite subsystem, the peeling assembly, and the functional layer composite subsystem are arranged in sequence from upstream to downstream. The substrate composite subsystem can transfer the adhesive layer to the substrate layer in a manner of laminating the adhesive material layer on one or both sides of the substrate layer; at the same time, it can also form a substrate layer with adhesive layers on both sides in combination with adhesive solution coating. For example, first laminate the adhesive material layer on one side of the substrate layer, and then coat the adhesive solution on the other side (the side where the adhesive material layer has not been laminated) of the substrate layer to form an adhesive layer. In other words, the substrate composite subsystem laminates the adhesive material layer on one side of the substrate layer; and laminates the adhesive material layer on the other side of the substrate layer, or coats the adhesive solution on the other side of the substrate layer. That is, in addition to directly transferring the adhesive layer using the peelable layer, when an adhesive material layer has been laminated on one side of the substrate layer, the adhesive solution can be directly coated on the surface of the other side of the substrate layer; because an adhesive material layer has been laminated on one side of the substrate layer, the peelable layer in the adhesive material layer provides a support structure for the substrate layer during the stretching process; on the premise of reaching the required surface stretching state for coating the adhesive solution on the substrate layer, the overall tensile strength can be enhanced by using the laminated adhesive material layer, thereby reducing or avoiding excessive stretching of the substrate layer and further avoiding damage to the substrate layer. Further, when coating the adhesive solution on the substrate layer to form an adhesive layer, a peelable layer is also covered on the adhesive layer; further, when laminating the adhesive material layer on one side of the substrate layer, it can be first wound up and then unwound for coating the adhesive solution on the other side later.

[0006] In this application, the adhesive layer is loaded on the peelable layer, and then, only by keeping the substrate layer flat, the adhesive layer can be transferred onto the substrate layer through the lamination of the peelable layer and the substrate layer. During this process, since the adhesive layer is already shaped, and the substrate layer only needs to be slightly stretched for easy lamination with the adhesive layer; the requirements for the tensile strength and elongation of the substrate layer are reduced, and the lamination process is fast and convenient. Compared with coating the adhesive layer on the substrate layer, the continuous long-term stretching of the substrate layer during the process is avoided. To make the adhesive layer fit flatly, only the peelable layer needs to be stretched as much as possible. Since the peelable layer is peeled off during the subsequent lamination process, the thickness range of the peelable layer can be large, and its thickness can be increased as much as possible to meet the requirements during the stretching process, etc., and there is no need to worry about damage to the peelable layer. The adhesive layer can be transferred to both sides of the substrate layer through the peelable layer, which is efficient and fast; or as described above, the adhesive layer can be transferred through the peelable layer first, and then the peelable layer can be used as a support layer to complete the formation of the adhesive layer on the other side by coating. Similarly, the defects existing in the process of forming the adhesive layer by traditional single stretching of the substrate layer and coating the adhesive solution can be reduced or avoided, adapting to diverse production environments. Based on the solution of this application, on the premise of ensuring the transferability of the adhesive layer to the substrate layer, since the stretching requirements for the substrate layer are reduced, the substrate layer can use a substrate layer with a smaller thickness or a lower tensile strength of the material but is convenient for improving the electrical conductivity, which is convenient for realizing a thinner and lighter composite current collector or a composite current collector with better electrical conductivity according to the needs. Further, when the adhesive material layer is a material made by an offline process, the adhesive material layer is the shaped adhesive layer and the adhered peelable layer.

[0007] Further, the peelable layer includes a release film layer. Further, the foil layer includes a copper foil layer. Further, the substrate layer can be made of PET, PP, and PI films. Further still, the thickness of the substrate layer is 1.5 - 10 μm.

[0008] Further, the substrate composite subsystem at least includes a pressing component. Further, the substrate composite subsystem includes: a substrate transmission mechanism, a viscous material transmission mechanism, and a pressing component. The substrate transmission mechanism drives the substrate layer towards the pressing component. The viscous material transmission mechanism is eccentrically arranged relative to the substrate transmission mechanism to drive the viscous material layer towards the pressing component, and the side of the adhesive layer faces the substrate layer. The pressing component presses the substrate layer and the viscous material layer together. Depending on whether there is a pretreatment step upstream, the substrate transmission mechanism can be a transmission roller or an unwinding mechanism, which drives the substrate layer from one end to the pressing component. Similarly, the viscous material transmission mechanism can also be a transmission roller or an unwinding mechanism depending on whether the viscous material layer is formed online or offline. The eccentric arrangement of the viscous material transmission mechanism relative to the substrate transmission mechanism is beneficial to synchronously drive the viscous material layer on one side of the transmitted substrate layer, and finally both reach the pressing component. The pressing component can be formed by a pair of upper and lower pressing rollers. The substrate layer and the viscous material layer are transmitted between the upper and lower pressing rollers and pressed together. And the adhesive layer of the viscous material layer faces the substrate layer, which is convenient for the pressing component to press and combine the viscous material layer and the substrate layer after pressing, so that the adhesive layer is bonded to the substrate layer.

[0009] Further, it includes two viscous material transmission mechanisms, which are respectively located on both sides of the substrate transmission mechanism, and both make the side of the adhesive layer of the viscous material layer face the substrate. The pressing component presses the two sides of the substrate layer and the corresponding side viscous material layer together. For composite foils including composite current collectors as an example, generally, foil layers need to be compounded on both sides. If the traditional method of coating the adhesive layer is used, at least the coating and pre-curing on one side of the substrate layer need to be carried out first, and then the coating, pre-curing, and drying on the other side of the substrate layer. For the same substrate layer, it will involve frequent stretching of the substrate layer. Moreover, the states such as the pressure generated during coating contact and the load of the adhesive solution during the coating process have the obvious above-mentioned adverse effects, with high requirements for the stretching performance of the substrate layer and may damage the substrate layer. However, if the composite foil production system of the present application is used, on the basis of only keeping the substrate layer flat, the corresponding side viscous material layers can be synchronously driven to the pressing component through the upper and lower two viscous material transmission mechanisms, so that the viscous material layers can be compounded on both sides of the substrate layer at the pressing component, and the adhesive layers can be transferred to both sides of the substrate layer at the same time and enter the subsequent peeling and compounding processes. It not only avoids the multiple coating, pre-curing and other conditions under the stretching state of the substrate layer transmission, avoids the limitations or adverse effects brought by frequent stretching, but also simplifies and improves the efficiency of the process of transferring the adhesive layer to the substrate layer, and can improve the processing efficiency of the substrate layer and thus the overall production efficiency of the composite foil.

[0010] Further, the substrate composite subsystem further includes a first peelable layer unwinding device, a first coating device, and a first pre-curing device. The first peelable layer unwinding device unwinds the peelable layer, the first coating device coats the adhesive liquid on the peelable layer, and the first pre-curing device pre-cures the coated adhesive liquid to obtain a sticky material layer. That is, the sticky material layer can be formed by on-line coating. However, since the peelable layer is finally peeled off, thicker and more diverse materials can be used as long as they can support the adhesive layer. Based on the on-line method, it is beneficial to directly produce the final composite foil based on existing supply products, reduce the time interval between different processes, and improve production efficiency. Further, the sticky transmission mechanism is a transmission roller, and the sticky material layer is transmitted by the transmission roller and moves towards the pressing assembly.

[0011] Further, the substrate composite subsystem includes a substrate transmission mechanism, a sticky material transmission mechanism, a pressing assembly, a second coating device, and a second pre-curing device; the substrate transmission mechanism transmits the substrate layer towards the pressing assembly, and the side with the adhesive layer faces the substrate layer; the pressing assembly presses one side of the substrate layer and the sticky material layer together; the second coating device receives the substrate layer that has passed through the pressing assembly and coats the adhesive liquid on the side of the substrate layer that has not been pressed with the sticky material layer; the second pre-curing device pre-cures the coated adhesive liquid; so that both sides of the substrate layer have adhesive layers. The substrate transmission mechanism transmits the substrate layer, the sticky material transmission mechanism is eccentrically arranged relative to the substrate transmission mechanism, the sticky material transmission mechanism transmits the sticky material layer towards the pressing assembly, and after the substrate layer reaches the pressing assembly, it is combined with the sticky material layer on one side by the pressing assembly. After the combination, it enters the downstream second coating device, and the second coating device coats the adhesive liquid on the side of the substrate layer that has not been pressed with the sticky material layer, and the second pre-curing device cures the adhesive liquid to form an adhesive layer. This system can realize a substrate layer processing method that combines directly pressing the sticky material layer on the substrate layer and coating the adhesive liquid on the substrate layer, and finally makes both sides of the substrate layer have adhesive layers. Further, a second peelable layer unwinding mechanism can also be included to facilitate covering the peelable layer on the formed adhesive layer.

[0012] Furthermore, the foil composite subsystem includes a pressure roller assembly, a supporting roller body, and a guiding roller. The pressure roller assembly is formed by two or more pressure roller components. Each pressure roller component includes a pressure roller and a telescopic mechanism connected to the pressure roller. The pressure roller assembly is at least used to drive the substrate layer carrying the adhesive layer. The surface of the supporting roller body carries a foil layer. The pressure roller assembly and the surface of the supporting roller body are configured to jointly laminate the substrate layer carrying the adhesive layer and the foil layer to obtain a composite foil. The guiding roller is used to pull the composite foil away from the surface of the supporting roller body. Further, when the pressure roller assembly cooperates with the supporting roller body, the pressure roller component is configured to provide a pressing space by making the corresponding pressure roller cooperate with the surface of the supporting roller body, and the pressure rollers in the pressure roller assembly are arranged circumferentially along the surface of the supporting roller body. The foil composite subsystem can be applied to the composite process of thin and easily breakable materials and ensure the composite quality. The composite current collector production system formed based on the foil composite subsystem has a simple structure, is convenient for deployment and installation, and the obtained composite product has corresponding good performance.

[0013] The pressure roller components are arranged circumferentially along the surface of the supporting roller body, which can adapt to the cylindrical side surface of roller-shaped or wound materials. When the substrate layer carrying the adhesive layer travels between the pressure roller assembly and the wound material, the pressure roller assembly can press down the substrate layer carrying the adhesive layer onto the foil layer of the supporting roller body and press it downward toward the foil layer side to achieve the adhesion and lamination between the substrate layer and the foil layer. When at least two pressure roller components are provided in the pressure roller assembly, at least two areas of lamination are achieved on the corresponding cylindrical side surface. On the one hand, it is convenient to extend the lamination time and improve the lamination quality on the premise of ensuring the continuous production of materials; on the other hand, it is also convenient to implement different area lamination settings according to the material characteristics. For the situation where the distance between the pressure roller assembly and the supporting surface such as the surface of the roller hardly changes, the telescopic mechanism at least maintains and adjusts the telescopic length to ensure a relatively stable pressing pressure. For example, for a supporting roller body such as a cathode roller whose surface produces a metal foil layer, during the composite process, the distance between the pressure roller and the cathode roller hardly changes; the telescopic mechanism is not only extended to provide pressure when lamination is required, but it can be applied to various scenarios. Further, the pressure roller components in the pressure roller assembly are arranged circumferentially along the surface of the supporting roller body. At least when the telescopic mechanism is in a contracted state, the telescopic mechanisms are also arranged circumferentially accordingly. This is beneficial to using the same telescopic mechanism to adapt to the lamination at multiple positions on the arc of the cylindrical side surface of the supporting roller body, and at the same time reduces the control difficulty of the corresponding device control program for different pressure roller components.

[0014] Another object of the present invention is to provide a method for producing a composite foil, including the steps: S1. Laminate at least one side of the substrate layer with a sticky material layer to obtain a laminated substrate layer; the sticky material layer includes a peelable layer and an adhesive layer located on one side of the peelable layer, and the peelable layer in the laminated substrate layer is located on the side away from the substrate layer; S2. When one side of the composite base material layer to be composite has a peelable layer, peel the peelable layer on the corresponding side before composite with the foil layer to expose the adhesive layer on the corresponding side. S3. Press the base material layer with the adhesive layer onto the foil layer, and composite the base material layer and the foil layer through its adhesive layer to obtain a composite foil.

[0015] Furthermore, before step S1, there is also step S0 of unwinding the peelable layer and coating the adhesive solution on the peelable layer. Further, after coating the adhesive solution on the peelable layer, a pre-curing treatment is also carried out. Further, both sides of the composite base material layer have adhesive layers. In step S1, both sides of the base material layer are composite with the sticky material layer to obtain the composite base material layer; or, both sides of the composite base material layer have adhesive layers. In step S1, one side of the base material layer is composite with the sticky material layer, and the adhesive solution is coated on the other side of the base material layer to form an adhesive layer to obtain the composite base material layer.

[0016] Furthermore, in step S1, both sides of the composite base material layer have adhesive layers, and steps S2 - S3 realize the composite of the foil layers on both sides of the base material layer; or, in step S1, both sides of the composite base material layer have adhesive layers, and steps S2 - S3 realize the composite of the foil layer on one side of the base material layer. There is also step S4: repeat steps S2 - S3 to realize the composite of the foil layers on both sides of the base material; or, in step S1, one side of the base material layer is composite with the sticky material layer, and steps S2 - S3 realize the composite of the foil layer on one side of the base material layer. There is also step S4: coat the adhesive solution on the other side of the base material layer to form an adhesive layer; S5: repeat steps S2 - S3 to realize the composite of the foil layers on both sides of the base material.

[0017] Another object of the present invention is to provide a composite foil prepared by using the production method of the foregoing composite foil. Based on the production method of the composite foil of the present application, the base material layer and the foil layer can be tightly combined through the adhesive layer, improving the unstable combination caused by poor adhesion of the base material layer when directly attaching the foil layer to the base material layer commonly. And it is convenient to use a base material layer with a lower thickness and a more diverse material base material layer, providing a composite foil with better performance or more diversity.

[0018] Another object of the present invention is to provide the application of the foregoing composite foil production system and / or the production method of the foregoing composite foil in the production of a composite current collector. Based on the foregoing composite foil production system and the production method of the composite foil, it is convenient to obtain a composite current collector with better quality, and is beneficial to further lighten the composite current collector and expand the selection of the base material layer of the composite current collector, so as to obtain a composite current collector more suitable for new energy batteries, etc.

[0019] Compared with the prior art, the beneficial effects of the present application are as follows: Based on the composite foil production system of the present application, it is possible to achieve the bonding between the substrate layer and the adhesive layer while avoiding excessive stretching of the substrate and ensuring that the performance of the substrate layer is not lost, and it is convenient to achieve the subsequent lamination with other foil layers. Especially during the process of providing substrate adhesion, it is possible to avoid multiple and continuous excessive stretching of the substrate layer alone, reduce the loss of the mechanical properties of the substrate layer during the pre-treatment process before lamination, and facilitate improving the quality of the final product and the production yield. Moreover, through the system or method of the present application, the requirements for the tensile strength and elongation rate of the substrate layer can be reduced. The substrate layer can use a substrate layer with a smaller thickness or a lower tensile strength of the material but is convenient for improving the electrical conductivity, expanding the selection range of the substrate layer, and facilitating the realization of a thinner and lighter composite current collector or a composite current collector with better electrical conductivity according to the needs. And the lamination process is fast and convenient, and the production efficiency is also easy to be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the composite foil production system of the present application.

[0021] Figure 2 It is a schematic structural diagram (I) of the foil lamination subsystem of the present application.

[0022] Figure 3 It is a schematic structural diagram of the substrate lamination subsystem for online coating of a peelable layer of the present application.

[0023] Figure 4 It is a schematic structural diagram of the cooperation structure of the inlet roller, pressure roller combination and outlet roller of the present application.

[0024] Figure 5 It is a three-dimensional structure diagram of the cooperation of the inlet roller, pressure roller combination and outlet roller of the present application.

[0025] Figure 6 It is a schematic partial structural diagram (II) of the foil lamination subsystem of the present application.

[0026] Figure 7 It is a schematic structural diagram of the substrate lamination subsystem of the present application for the process of laminating with a viscous material layer and online coating the substrate layer.

[0027] Description of the Drawings: Composite Foil Production System 1000, Substrate Laminating Subsystem 1100, Substrate Transmission Mechanism 1110, Adhesive Material Transmission Mechanism 1120, Pressing Assembly 1130, First Gluing Device 1210, First Pre-Curing Device 1220, Second Gluing Device 1310, Second Pre-Curing Device 1320, Peeling Assembly 2100, Foil Laminating Subsystem 3000, Feeding Roller 3101, Height Adjustment Mechanism 3102, Deflecting Roller 3103, Press Roller Assembly 3120, Press Roller 31211, Telescopic Mechanism 31212, Initial Pressing Roller 3121A, Final Pressing Roller 3121B, Transition Pressing Roller 3121C, Supporting Roller Body 4100, Laminated Substrate Layer 5100, Substrate Layer 5110, Adhesive Material Layer 5120, Adhesive Layer 5121, Peelable Layer 5122, Foil Layer 5200, Composite Foil 5300. Detailed Description of the Invention

[0028] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. For better illustration of the following embodiments, some components in the drawings may be omitted, enlarged or reduced, which do not represent the dimensions of the actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0029] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings and specific embodiments. However, those skilled in the art will understand that the following described embodiments are some, but not all, of the embodiments of the present invention, which are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention. For those conditions not specified in the embodiments, they shall be carried out according to the conventional conditions or the conditions recommended by the manufacturers. Those reagents or instruments not specified by the manufacturers can be obtained through commercial purchases and are conventional products. Embodiment 1

[0030] As Figure 1As shown in the figure, this embodiment discloses a composite foil production system 1000, including: a substrate composite subsystem 1100, configured to laminate a sticky material layer 5120 on both sides of a substrate layer 5110 to obtain a laminated substrate layer 5100; the sticky material layer 5120 includes an adhesive layer 5121 and a peelable layer 5122 on one side of the adhesive layer 5121, and after lamination, the peelable layer 5122 is located on the side away from the substrate layer 5110; a peeling assembly 2100, configured to peel the peelable layer 5122 on the corresponding side before the substrate layer 5110 is laminated with a foil layer 5200 through the adhesive layer 5121; a foil composite subsystem 3000, configured to laminate the substrate layer 5110 so that it is laminated with the foil layer 5200 through the exposed adhesive layer 5121, and guide away the obtained composite foil 5300. Among them, the peelable layer 5122 includes a release film layer; the foil layer 5200 includes a copper foil layer; the substrate layer 5110 can adopt a PET, PP or PI ultra-thin film with a thickness of 1.5 to 10 μm.

[0031] The substrate composite subsystem 1100 includes: a substrate transmission mechanism 1110, a sticky material transmission mechanism 1120, and a lamination assembly 1130. The substrate transmission mechanism 1110 drives the substrate layer 5110 towards the lamination assembly 1130. The sticky material transmission mechanism 1120 is eccentrically arranged relative to the substrate transmission mechanism 1110 to drive the sticky material layer 5120 towards the lamination assembly 1130, and the side of the adhesive layer 5121 faces the substrate layer 5110; the lamination assembly 1130 laminates the substrate layer 5110 and the sticky material layer 5120. Depending on whether there is a pretreatment step upstream, the substrate transmission mechanism 1110 can be a transmission roller or a unwind mechanism, driving the substrate layer 5110 from one end to the lamination assembly 1130. Similarly, the sticky material transmission mechanism 1120 can be a transmission roller or an unwind mechanism according to whether the sticky material layer 5120 is online or offline; the sticky material transmission mechanism 1120 is eccentrically arranged with respect to the substrate transmission mechanism 1110, synchronously driving the sticky material layer 5120 on one side of the driven substrate layer 5110, with the adhesive layer 5121 of the sticky material layer 5120 facing the substrate layer 5110, and finally both reach the lamination assembly 1130. The lamination assembly 1130 is formed by a pair of upper and lower pressure rollers, and the substrate layer 5110 and the sticky material layer 5120 are driven between the upper and lower pressure rollers and laminated.

[0032] In this embodiment, the composite foil 5300 is a composite current collector. To achieve synchronous double-sided treatment of the substrate layer 5110, the substrate composite subsystem 1100 includes two sticky material transmission mechanisms 1120, which are respectively located on both sides of the substrate transmission mechanism 1110, and both make the side of the adhesive layer 5121 of the sticky material layer 5120 face the substrate; the lamination assembly 1130 laminates both sides of the substrate layer 5110 with the corresponding side sticky material layer 5120. At the same time, the adhesive layer 5121 is transferred to both sides of the substrate layer 5110 and enters the subsequent peeling and lamination processes.

[0033] When adopting the online production mode, such as Figure 3 shown, the substrate composite subsystem 1100 may further include a first peelable layer unwinding device, a first gluing device 1210, and a first pre-curing device 1220. The first peelable layer unwinding device unwinds the peelable layer 5122, the first gluing device 1210 applies glue on the peelable layer 5122, and the first pre-curing device 1220 pre-cures the applied glue to obtain the adhesive material layer 5120. The adhesive transmission mechanism is a transmission roller, and the adhesive material layer 5120 is transmitted by the transmission roller and moves towards the pressing assembly 1130.

[0034] After obtaining the composite substrate layer 5100, the peelable layer 5122 is peeled off through the peeling assembly 2100; then the foil composite subsystem 3000 performs the composite process.

[0035] Such as Figure 2 、 4 、5 shown, in this embodiment, the foil composite subsystem 3000 includes an inlet roller 3101, a press roller combination 3120, a supporting roller body 4100, and a guiding roller 3103. The end of the inlet roller 3101 is connected with a height adjusting mechanism 3102. The press roller combination 3120 is formed by two or more press roller assemblies. Each press roller assembly includes a press roller 31211 and a telescopic mechanism 31212 connected to the press roller 31211. The inlet roller 3101 guides the composite substrate layer 5100 to the press roller combination 3120. The press roller combination 3120 is at least used to transmit and carry the substrate layer 5110 with the glue layer 5121. The surface of the supporting roller body 4100 carries the foil layer 5200. The surfaces of the press roller combination 3120 and the supporting roller body 4100 are configured to jointly composite the substrate layer 5110 with the glue layer 5121 and the foil layer 5200 to obtain the composite foil 5300. The guiding roller 3103 is used to pull the composite foil 5300 away from the surface of the supporting roller body 4100. When the press roller combination 3120 cooperates with the supporting roller body 4100, the press roller assembly is configured to make the corresponding press roller 31211 cooperate with the surface of the supporting roller body 4100 to provide a pressing space, and the press rollers 31211 in the press roller combination 3120 are arranged circumferentially along the surface of the supporting roller body 4100.

[0036] During the specific compounding process, the pressing roller assemblies are arranged circumferentially along the surface of the holding roller body 4100, which can adapt to the cylindrical side surface of the holding roller body 4100. When the substrate layer 5110 carrying the adhesive layer 5121 travels between the pressing roller assembly 3120 and the foil material, the pressing roller assembly 3120 can press down the substrate layer 5110 carrying the adhesive layer 5121 onto the foil material layer 5200 and press it downward toward the foil material layer 5200 to achieve the adhesion and pressing between the substrate layer 5110 and the foil material layer 5200; then it is separated by the separating roller 3103. The holding roller body 4100 can be a cathode roller carrying the foil material layer 5200. Among them, the pressing roller assemblies in the pressing roller assembly 3120 are arranged circumferentially along the surface of the holding roller body 4100, and at least in the contracted state of the telescopic mechanism 31212, the telescopic mechanism 31212 is also arranged circumferentially accordingly.

[0037] Such as Figure 6As shown, in order to improve the compounding effect, in this embodiment, the pressure roller 31211 near the upstream end of the pressure roller combination 3120 is the preliminary pressure roller 3121A, and the pressure roller 31211 near the downstream end of the pressure roller combination 3120 is the finishing pressure roller 3121B; the pressure roller assembly in the pressure roller combination 3120 is configured so that the downward pressure F1 of the preliminary pressure roller 3121A is greater than the downward pressure F2 of the finishing pressure roller 3121B. It is set to F1>F2. When all the composite materials reach the preliminary laminating roller 3121A for lamination, the preliminary laminating roller 3121A provides a strong laminating pressure, so as to tightly press the composite layer in the initial bonding state, keep the composite material in the laminating area fully stretched, and squeeze out the gaps or bubbles that may exist in the composite interface to the upstream input side, so as to ensure that the composite interface of the composite layer passing through the preliminary laminating roller 3121A is completely bonded, and basically does not contain obvious bubbles, gaps, etc., thereby improving the laminating quality; and the final laminating roller 3121B provides a laminating pressure of F2 which is less than F1, which can avoid The front and rear sides of the composite layer are both overstretched due to strong tension, which avoids wrinkles caused by elastic contraction after passing through the lamination zone; at the same time, the composite layer after the initial lamination roller 3121A may still have a very small air gap at the microscopic level that basically does not affect the performance of the composite layer. If the final lamination roller 3121B also maintains a strong lamination pressure, it may squeeze the air gap upstream, that is, between the initial lamination roller 3121A and the final lamination roller 3121B. As the production process proceeds, it will continue to accumulate in multiple areas of the finished composite layer to form obvious bubbles or wrinkles; it will significantly affect the quality of the final product. On the other hand, setting F2<F1 is also conducive to the derivation and separation of the composite layer. The final lamination roller 3121B has a lower lamination pressure than the upstream one, which is conducive to reducing the degree of adhesion of the foil layer on the corresponding abutting roller body 4100, and making it easier for the laminated foil to separate from the corresponding roller body along the transmission direction. If F2 is a strong pressing pressure, the foil may easily stick to the corresponding abutting roller 4100 as the material moves, and the composite layer may be torn due to uneven force when the material is conveyed. The pressure includes the pressure when the corresponding pressing roller 31211 acts vertically on the surface of the abutting roller 4100.

[0038] To further improve the compounding effect, the roll combination 3120 includes more than three rolls 31211, including a preliminary compaction roll 3121A, a final compaction roll 3121B, and more than one intermediate compaction roll 3121C located between the preliminary compaction roll 3121A and the final compaction roll 3121B; the roll assembly in the roll combination 3120 is configured such that the downward pressure F1 of the preliminary compaction roll 3121A > the downward pressure F2 of the final compaction roll 3121B, and the downward pressure F1 of the preliminary compaction roll 3121A > the downward pressure F3 of the intermediate compaction roll 3121C. Further, F3 ≥ F2. Still further, the roll assembly in the roll combination 3120 is configured such that F1 > F3 > F2, and the downward pressure decreases in the direction from preliminary compaction to final compaction, with the decreasing ratio ranging from 3% to 20%; that is, F1 × 3% < F1 - F3 < F1 × 20%, F3 × 3% < F3 - F2 < F3 × 20%. Still further, the decreasing ratio ranges from 5% to 15%, F1 × 5% < F1 - F3 < F1 × 15%, F3 × 5% < F3 - F2 < F3 × 15%. Further, the magnitudes of F1, F2, and F3 are in the range of 0.1 N / in to 10 N / in (0.1 N / inch to 10 N / inch). Further, the diameter of the roll 31211 in the roll combination 3120 ranges from 120 to 200 mm.

[0039] The preliminary pressing roller 3121A applies a relatively large pressing pressure at the initial stage of lamination, causing the lower pressing area to be stressed concentratedly so as to fully laminate while preventing air bubbles from entering. The finishing pressing roller 3121B assists in laminating the composite layer to enhance the bonding strength. In addition to extending the lamination area of the composite layer during travel, the finishing pressing roller 3121B can also slowly release the composite foil 5300, thereby promoting it to separate from the abutting roller body 4100 and be led out. The transition pressing roller 3121C can at least also play the role of assisting the pressing of the finishing pressing roller 3121B. Preferably, its downward pressing pressure F3 is also less than F1. And as the intermediate transition pressing roller 3121C, it can increase the auxiliary pressing area and further improve the lamination effect. Combining F3 less than F1, it can cooperate with the preliminary pressing roller 3121A and the finishing pressing roller 3121B to achieve a progressive slowdown in pressing and release. It provides a more diverse adjustment process, facilitating selective adjustment in accordance with the material characteristics and lamination requirements. And the surface hardness H1 of the preliminary pressing roller 3121A > the surface hardness H2 of the finishing pressing roller 3121B; the surface hardness H1 of the preliminary pressing roller 3121A > the surface hardness H3 of the transition pressing roller 3121C. Further, H3≥H2; further, H1≥45 degrees; furthermore, H1 > H3 > H2. And the range of H1 is 45 - 55 degrees; the range of H3 is 35 - 45 degrees; the range of H2 is 25 - 35 degrees. The surface hardness of the roller includes the surface rubber hardness of the roller body and is the Shore A hardness; the action areas corresponding to different surface hardnesses of the rollers are different, and setting them as the aforementioned H1, H3, and H2 can further significantly improve the lamination effect. The diameter D1 of the preliminary pressing roller 3121A < the diameter D2 of the finishing pressing roller 3121B. When a transition pressing roller 3121C is provided, the diameter D1 of the preliminary pressing roller 3121A ≤ the diameter D3 of the transition pressing roller 3121C, and the diameter D3 of the transition pressing roller 3121C ≤ the diameter D2 of the finishing pressing roller 3121B; the range of D1 is 120 - 180 mm; the range of D2 is 180 - 200 mm; the range of D3 is 120 - 200 mm. Or, the diameter D1 of the preliminary pressing roller 3121A > the diameter D3 of the transition pressing roller 3121C. Example 2

[0040] This embodiment discloses a production system 1000 for a composite foil 5300. The difference between this embodiment and Embodiment 1 lies in: the substrate lamination subsystem 1100 laminates the adhesive material layer 5120 on one side of the substrate layer 5110, and then coats a glue solution on the opposite side of the substrate layer 5110 where the adhesive material layer 5120 has been laminated to form a glue layer 5121. That is, the substrate lamination subsystem 1100 first laminates the adhesive material layer 5120 on one side of the substrate layer 5110, and then forms the glue layer 5121 by coating the glue solution on the other surface of the substrate layer 5110.

[0041] As Figure 7As shown, in the composite foil 5300 production system 1000 of this embodiment, the substrate composite subsystem 1100 includes a substrate transmission mechanism 1110, a viscous material transmission mechanism 1120, a lamination assembly 1130, a second coating device 1310, and a second pre-curing device 1320. The substrate transmission mechanism 1110 drives the substrate layer 5110 towards the lamination assembly 1130, with the side of the adhesive layer 5121 facing the substrate layer 5110. The lamination assembly 1130 laminates one side of the substrate layer 5110 with the viscous material layer 5120. The second coating device 1310 receives the substrate layer 5110 that has passed through the lamination assembly 1130 and coats the side of the substrate layer 5110 that has not been laminated with the viscous material layer 5120 with glue. The second pre-curing device 1320 pre-cures the coated glue so that both sides of the substrate layer 5110 have the adhesive layer 5121. In the substrate composite subsystem 1100 of this embodiment, a second peelable layer unwinding mechanism may also be included to facilitate covering the peelable layer 5122 on the formed adhesive layer 5121.

[0042] Then, based on the same peeling assembly 2100 and foil composite subsystem 3000 as in the previous embodiment 1, the foils on both sides of the substrate layer 5110 can be laminated to obtain the corresponding composite foil 5300. Embodiment 3

[0043] This embodiment discloses a method for producing a composite foil 5300, including the steps: S1. Laminating the substrate layer 5110 with the viscous material layer 5120 to obtain the laminated substrate layer 5100; the viscous material layer 5120 includes a peelable layer 5122 and an adhesive layer 5121 on one side of the peelable layer 5122, and in the laminated substrate layer 5100, the peelable layer 5122 is located on the side away from the substrate layer 5110; S2. Before laminating with the foil layer 5200, peeling off the peelable layer 5122 on the side to be laminated of the laminated substrate layer 5100 to expose the corresponding side adhesive layer 5121; S3. Pressing the substrate layer 5110 carrying the adhesive layer 5121 onto the foil layer 5200, and laminating the substrate layer 5110 and the foil layer 5200 through the adhesive layer 5121 to obtain the composite foil 5300.

[0044] Among them, before step S1, there is also step S0 of unwinding the peelable layer 5122 and coating the glue on the peelable layer 5122; after coating the glue on the peelable layer 5122, a pre-curing treatment is also performed.

[0045] In the specific implementation process, according to the actual production configuration, the production process of the overall composite foil 5300 can be achieved in the following multiple ways: In step S1, both sides of the substrate layer 5110 are compounded with the adhesive material layer 5120, and in steps S2 - S3, the foil layers 5200 on both sides of the substrate layer 5110 are compounded; or, in step S1, both sides of the substrate layer 5110 are compounded with the adhesive material layer 5120, and in steps S2 - S3, the foil layer 5200 on one side of the substrate layer 5110 is compounded, and step S4 is further included: repeating steps S2 - S3 to compound the foil layers on both sides of the substrate; or, in step S1, one side of the substrate layer 5110 is compounded with the adhesive material layer 5120, and in steps S2 - S3, the foil layer 5200 on one side of the substrate layer 5110 is compounded, and step S4 is further included: repeating steps S1 - S3 to compound the foil layers on both sides of the substrate. Example 4

[0046] This example discloses a production method of a composite foil 5300. In this example, adhesive layers 5121 are provided on both sides of the already - compounded substrate layer 5100. Different from Example 3, in step S1, one side of the substrate layer 5110 is compounded with the adhesive material layer 5120, and a glue solution is coated on the other side of the substrate layer 5110 to form the adhesive layer 5121, obtaining the already - compounded substrate layer 5100. Then, through steps S2 - S3, the foil layers 5200 on both sides of the substrate layer 5110 are compounded. Example 5

[0047] This example discloses a composite foil 5300 prepared by using the aforementioned production method of the composite foil 5300. Based on the production method of the composite foil 5300 of the present application, the substrate layer 5110 and the foil layer 5200 can be tightly combined through the adhesive layer 5121, improving the unstable combination caused by the poor adhesion of the common substrate layer 5110. And it is convenient to use a substrate layer 5110 with a lower thickness and a more diverse material for the substrate layer 5110, providing a composite foil 5300 with better performance or more diversity. Example 6

[0048] This example discloses an application of the aforementioned composite foil 5300 production system 1000 and / or the aforementioned production method of the composite foil 5300 in the production of a composite current collector. Based on the aforementioned composite foil 5300 production system 1000 and the production method of the composite foil 5300, it is convenient to obtain a composite current collector with better quality, and it is beneficial to further lighten the composite current collector and expand the selection of materials for the substrate layer 5110 of the composite current collector, thereby obtaining a composite current collector more suitable for new - energy batteries, etc.

[0049] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the technical solutions of the present invention, rather than limitations on the specific implementation manners of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A composite foil production system, characterized in that, Comprising: A substrate composite subsystem for laminating an adhesive material onto a substrate layer; And / or, coating an adhesive solution on the opposite side of the substrate layer where the adhesive material layer has been laminated to form an adhesive layer; the adhesive material layer includes an adhesive layer and a peelable layer on one side of the adhesive layer, and after lamination, the peelable layer is located on the side away from the substrate layer; A peeling assembly for peeling the corresponding peelable layer on one side of the substrate layer when there is a peelable layer on the side to be composite of the substrate layer before the substrate layer is composite with the foil layer through the adhesive layer; A foil composite subsystem for pressing the substrate layer to composite it with the foil layer through the exposed adhesive layer and guiding away the obtained composite foil.

2. The composite foil production system according to claim 1, characterized in that, The substrate composite subsystem includes: a substrate transmission mechanism, an adhesive material transmission mechanism, and a pressing assembly; the substrate transmission mechanism drives the substrate layer towards the pressing assembly; the adhesive material transmission mechanism is eccentrically arranged relative to the substrate transmission mechanism to drive the adhesive material layer towards the pressing assembly, and the side of the adhesive layer faces the substrate layer; the pressing assembly laminates the substrate layer and the adhesive material layer.

3. The composite foil production system according to claim 2, wherein, It includes two adhesive material transmission mechanisms, respectively located on both sides of the substrate transmission mechanism, and both make the side of the adhesive layer of the adhesive material layer face the substrate; the pressing assembly laminates both sides of the substrate layer with the corresponding side adhesive material layer.

4. The composite foil production system according to claim 2, characterized in that, The substrate composite subsystem further includes a first peelable layer unwinding device, a first coating device, and a first pre-curing device. The first peelable layer unwinding device unwinds the peelable layer, the first coating device coats the adhesive solution on the peelable layer, and the first pre-curing device pre-cures the coated adhesive solution to obtain the adhesive material layer.

5. The composite foil production system according to claim 1, characterized in that The substrate composite subsystem includes a substrate transmission mechanism, an adhesive material transmission mechanism, a pressing assembly, a second coating device, and a second pre-curing device; the substrate transmission mechanism drives the substrate layer towards the pressing assembly, and the side of the adhesive layer faces the substrate layer; the pressing assembly laminates one side of the substrate layer with the adhesive material layer; the second coating device receives the substrate layer passing through the pressing assembly and coats the adhesive solution on the side of the substrate layer where the adhesive material layer has not been laminated; the second pre-curing device pre-cures the coated adhesive solution; so that both sides of the substrate layer have adhesive layers.

6. A composite material production system according to any one of claims 1 to 5, characterized in that, The foil composite subsystem includes a combination of pressing rollers, a supporting roller body, and a guiding roller. The combination of pressing rollers is formed by two or more pressing roller assemblies. The pressing roller assembly includes a pressing roller and a telescopic mechanism connected to the pressing roller; the combination of pressing rollers at least drives and carries the substrate layer with the adhesive layer; the surface of the supporting roller body carries a foil layer; the combination of pressing rollers and the surface of the supporting roller body are configured to jointly composite the substrate layer carrying the adhesive layer and the foil layer to obtain a composite foil; the guiding roller is used to pull the composite foil away from the surface of the supporting roller body.

7. A production method of a composite foil, characterized in that, Including steps: S1. Composite at least one side of the substrate layer with the adhesive material layer to obtain a composite substrate layer; the adhesive material layer includes a peelable layer and an adhesive layer on one side of the peelable layer, and in the composite substrate layer, the peelable layer is located on the side away from the substrate layer; S2. When there is a peelable layer on the side to be composite of the composite substrate layer, peel the corresponding peelable layer before composite with the foil layer to expose the corresponding side adhesive layer; S3. Press the substrate layer carrying the adhesive layer onto the foil layer, and composite the substrate layer and the foil layer through the adhesive layer to obtain a composite foil.

8. The production method of the composite foil according to claim 7, characterized in that, Before step S1, step S0 is further included, where the peelable layer is unrolled and the adhesive liquid is coated on the peelable layer; and / or, in step S1, one side of the substrate layer is laminated with the adhesive material layer, and the adhesive liquid is coated on the other side of the substrate layer to form an adhesive layer, thereby obtaining the laminated substrate layer.

9. A composite foil, characterized in that, It is prepared by using the production method of the composite foil according to any one of claims 7 to 8.

10. Application of the composite foil production system according to any one of claims 1 to 6 and / or the production method of the composite foil according to any one of claims 7 to 8 in the production of the composite current collector.

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