Composite foil production system, composite current collector production line and battery production line

Abstract

The utility model discloses a composite foil production system, a composite current collector production line and a battery production line, the composite foil production system comprises a thin film base material layer processing system, a foil generation device and a compounding device which are sequentially distributed from upstream to downstream, the thin film base material layer processing system comprises a chemical micro-etching device, and the chemical micro-etching device is connected with the foil generation device. The chemical micro-etching device is at least used for micro-etching the surface of the film substrate layer; the foil generating device is at least used for generating a foil layer; and the compounding device is used for compounding the base material layer and the foil layer to obtain the composite foil. Based on the composite foil production system, the production process can be simplified, the control difficulty can be reduced, and the corresponding equipment cost and production cost can be reduced; and the production efficiency and the mass production can be conveniently improved. Comprising a film pretreatment process, and can improve the stability of the whole system, reduce the cost and the like based on a film substrate layer processing system. The produced composite foil or composite current collector can be improved in multiple aspects, including stability, mechanical property, uniformity and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of composite foil materials, and more specifically, to a composite foil material production system, a composite current collector production line and a battery production line. Background Art

[0002] Composite foils offer a balanced combination of energy density, safety, and battery cost, and have been used as lithium battery materials in new energy and energy storage applications. Common composite foil production methods, such as composite copper foil, often involve depositing a metal foil layer onto a substrate layer using methods such as vapor deposition and magnetron sputtering. While these methods can produce high-quality composite current collectors, they are difficult to operate, suffer from numerous efficiency limitations, and present significant challenges in mass production. Furthermore, the resulting composite current collectors may suffer from issues such as insufficient adhesion stability, composite uniformity, or mechanical properties. The production equipment and systems required for these common production methods are typically complex and expensive. For example, the equipment required for the deposition process has high construction and production costs, and the overall system production process is subject to numerous instabilities. Furthermore, existing technologies often perform corona pretreatment on the film substrate layer to enhance adhesion stability. Composite foil production systems also include such corona pretreatment systems, but these systems also present equipment costs and unstable pretreatment processes, as temperature and humidity can significantly impact the pretreatment results. This further exacerbates the instability of the overall composite foil production system.

[0003] Therefore, the existing technology urgently needs a new film substrate layer processing system and composite foil production system with stable processing, simple production process, reduced corresponding equipment costs, and easy mass production. Utility Model Content

[0004] The utility model aims to overcome at least one of the above-mentioned deficiencies of the prior art and provide a film substrate layer processing system and a composite foil production system with a simple structure and a stable corresponding processing and production process, which facilitates obtaining a film substrate and a corresponding composite foil with stable adhesion performance.

[0005] The technical solution adopted by the present invention is a film substrate layer processing system, comprising: a chemical micro-etching device, the chemical micro-etching device being used to at least micro-etch the surface of the film substrate layer. Furthermore, the chemical micro-etching device comprises an etching space, a film substrate layer loading mechanism, and a chemical treatment agent application mechanism. The film substrate layer loading mechanism guides the film substrate layer into the etching space, and the chemical micro-etching liquid application mechanism located within the etching space applies the chemical treatment agent to the surface of the film substrate layer. The loading mechanism can be a transmission device, such as a transmission roller, a conveyor belt, etc.

[0006] Furthermore, the chemical micro-etching device applies a chemical treatment agent to micro-etch the surface of the substrate layer; the chemical micro-etching device includes a roller coating device, a spraying device and / or an immersion device. Furthermore, it includes a corresponding chemical treatment agent storage space.

[0007] Furthermore, the device includes a roller coating device, a spraying device, and an immersion device. Furthermore, multiple branch guide rollers are provided at least upstream of the chemical micro-etching device, and the multiple branch guide rollers are used to guide the film to the roller coating, spraying, or immersion device, respectively. Multiple application routes can be provided.

[0008] The micro-etching treatment device of the present application can adopt a roller structure, a spray structure or an immersion tank structure, or a combination of two or more thereof; in the specific use process, a diversion guide roller combination that guides to different chemical micro-etching device structures can also be set in front of the chemical micro-etching device to meet different needs. Unlike common corona treatment and other methods, the present application uses a chemical treatment agent as the main component for chemical micro-etching, so it only needs to be applied to the surface of the substrate layer. Roller coating, spraying or immersion can effectively cover the liquid on the substrate layer to perform micro-etching, so it does not require a complicated application process, is simple to operate and can effectively ensure that all positions on the surface of the substrate layer are micro-etched.

[0009] Furthermore, the device further includes a residue removal device, located downstream of the chemical micro-etching device; the residue removal device includes a squeezer, a blower, and / or a drying device. The residue removal device removes the majority of unreacted liquid components, controlling the etching level and facilitating subsequent processing and compounding. Furthermore, a scraper device is provided upstream of the residue removal device for initially scraping off some unreacted components, thereby improving the efficiency of subsequent removal of residual unreacted liquid components.

[0010] Another object of the present application is to provide a composite foil production system, comprising: the aforementioned film substrate layer processing system, the foil generating device, and the composite device distributed in sequence from upstream to downstream, wherein the foil generating device is at least used to generate the foil layer; and the composite device is used to composite the substrate layer and the foil layer to obtain the composite foil.

[0011] Through the chemical micro-etching device, a chemical treatment agent is used to micro-etch the substrate layer, thereby enhancing the surface adhesion of the substrate layer while avoiding affecting the mechanical strength of the substrate layer. Then, the substrate layer that has passed through the chemical micro-etching device is pressed down to the foil layer on the foil generating device under the action of the composite device, thereby realizing the composite of the substrate layer and the foil layer, and is guided away from the cathode roller after the composite, that is, the composite substrate layer is used to drive the foil layer to be peeled off from the cathode roller. With the continuous unwinding of the substrate layer and the composite and separation of the substrate layer and the foil layer, a corresponding composite foil can be generated. The substrate layer can be a substrate layer with a sticky outer surface. Based on the composite foil production system of the present application, the production process can be simplified, the difficulty of operation can be reduced, and the corresponding equipment cost can be reduced; and it is convenient to improve production efficiency and mass production. At the same time, the production system of the present application improves the adhesion of the substrate layer and ensures the mechanical properties based on the chemical micro-etching pretreatment, so the corresponding composite foil has good adhesion stability and mechanical properties. Furthermore, since a liquid treatment agent is applied to the surface of the substrate layer for pretreatment, and the foil layer is independently generated and then composited, the substrate layer and the foil layer each have uniformity of treatment. For example, the surface of the substrate layer is treated with the treatment agent, and the thickness of the generated foil layer is uniform. The corresponding composite foil material is also significantly improved in terms of composite uniformity. Compared with the existing technology of forming the foil layer by magnetron sputtering on the thin film substrate layer, the quality is more controllable. That is, based on the production system of this application, it is easy to simplify the production process, reduce production costs, and facilitate mass production; the composite foil material or composite current collector produced can take into account and achieve improvements in multiple aspects, including stability, mechanical properties, uniformity, etc.

[0012] Furthermore, the foil material generating device includes a tank body containing electrolyte and a rotatable cathode roller, and a portion of the cathode roller can be immersed in the electrolyte to form a foil layer on the surface of the cathode roller.

[0013] Furthermore, the composite device includes a pressure roller assembly and a deflection roller. The pressure roller assembly and the cathode roller surface are configured such that, with the cathode roller surface as the support surface, the pressure roller assembly presses down on the substrate layer and the foil layer to produce a composite foil. The deflection roller is used to pull the composite foil away from the cathode roller surface. Furthermore, the pressure roller assembly is formed of two or more pressure roller assemblies, each of which includes pressure rollers and a telescopic mechanism connecting the pressure rollers. The pressure roller assemblies in at least one pressure roller assembly are arranged circumferentially along the foil forming device. Furthermore, the pressure roller assembly includes three pressure roller assemblies.

[0014] Furthermore, it also includes a glue coating device, which is arranged between the film substrate layer processing system and the foil material generating device, and is configured to coat the surface of the film with a glue layer after passing through the film substrate layer processing system.

[0015] In addition to using a naturally adhesive substrate layer for attachment, a glue coating device can also be used to apply glue to the surface of the substrate layer for transition, to provide an attachment surface, or to enhance bonding properties, so that the adhesive layer can be subsequently formed and laminated with the foil layer. The adhesive layer can significantly improve the composite stability and tightness between the substrate layer and the foil layer. Furthermore, because the surface properties of the substrate layer have been improved through micro-etching, both sides of the adhesive layer can fit more tightly, allowing the substrate layer and the foil layer to fit tightly together overall. After the adhesive layer is formed using a simple glue coating device, the substrate layer and the foil layer can be laminated, thus bridging the two processes of separate substrate layer processing and separate foil layer production to form a complete production process. This effectively reduces equipment costs and facilitates improved subsequent lamination effects and efficiency. It is worth noting that since the substrate layer has undergone chemical micro-etching, when the glue coating device applies glue on the surface of the substrate layer, as the glue forms a glue layer, the side close to the substrate layer will form a chimeric state with the micro-etching depressions and other positions of the substrate layer; at this time, the glue layer can use a glue layer that is more compatible with the foil layer. In addition to the viscosity of the glue layer itself, the chimeric properties of one side and the affinity of the other side are also utilized to improve the overall bonding strength of the composite foil.

[0016] Furthermore, the system includes a curing device, located downstream of the gluing device, configured to cure the adhesive layer on the film surface. The film passes through the film substrate processing system, the gluing device, and the curing device before arriving at the laminating device. The curing device facilitates rapid curing of the adhesive, initially curing the adhesive to form an adhesive layer. This is then laminated with the foil layer in a relatively stable, cured state.

[0017] Furthermore, the device further includes a reeling device and a reeling device; the reeling device is used to unwind at least the substrate layer; the reeling device is used to reel at least the composite foil layer; after the substrate layer is unwound from the reeling device, it passes through the film substrate layer processing system and arrives between the composite device and the foil material generating device, forming a composite foil material that is then reeled in by the reeling device. The cooperation between the reeling device and the reeling device facilitates maintaining a certain degree of tension in the substrate layer, thereby allowing for composite material to be laminated with a surface that is as spread as possible, thereby enhancing the conformability of the composite foil material.

[0018] Furthermore, it also includes a material transfer mechanism for transferring the composite foil on the winding device to be installed on the unwinding device; and adjusting the unwinding of the composite foil so that the uncompounded side faces the foil generating device when it reaches the compounding device. Furthermore, the material transfer mechanism can be a robot. When the unwinding to rewinding process in the composite foil production system of the present application realizes single-sided compounding, when double-sided compounding is required, it can be transferred to the initial unwinding position by the material transfer mechanism, and the other uncompounded side is used as the side to be compounded for unwinding and compounding, thereby repeating the double-sided compounding twice based on the single-layer compounding production structure. More specifically, when the material transfer mechanism is adopted, it can be applied to the production process of the composite current collector.

[0019] Furthermore, the composite foil production system described in this application is useful for producing composite current collectors that are stable and have good mechanical properties. The corresponding production process has multiple advantages, including high efficiency and high process controllability.

[0020] Furthermore, the substrate layer is a PET film, a PP film, a PI film, a PE film, a PVC film, a PBT film, a PC film, a PS film, an ABS film, a PA film, a PASF film, a PVDF film, a PEDOT film, a PANI film and a PPy film; that is, films formed corresponding to PET (polyethylene terephthalate), PP (polypropylene), PI (polyimide), PE (polyethylene), PVC (polyvinyl chloride), PBT (polybutylene terephthalate), PC (polycarbonate), PS (polystyrene), ABS (terpolymer of acrylonitrile (A)-butadiene (B)-styrene (S)), PA (polyamide), PASF (polyaryl sulfone), PVDF (polyvinylidene fluoride), PEDOT (poly(3,4-ethylenedioxythiophene), PANI (polyaniline) and PPy (polypyrrole).

[0021] Another object of the present application is to provide a composite current collector production line, including the aforementioned composite foil production system.

[0022] Furthermore, it includes two or more of the above-mentioned composite foil production systems; the composite foil production system includes an unwinding device, a film substrate layer processing system, a foil generating device, a compounding device, and a winding device distributed from upstream to downstream; the winding device of the upstream adjacent composite foil production system forms the unwinding device of the downstream adjacent composite foil production system; and the two composite foil production systems respectively composite the foil layer on one side of the substrate layer, and jointly composite the foil layer on both sides of the substrate layer.

[0023] When a composite foil production system achieves single-sided lamination, by installing two or more composite foil production systems and using the upstream winding device as the unwinding device for the downstream adjacent composite foil production system, the laminated foil on one side can be used as the unwinding material, and the composite foil production process can be repeated for lamination on the unlaminated side. This allows for double-sided lamination of the substrate layer using two composite foil production systems.

[0024] Another object of the present application is to provide a battery production line, including the aforementioned composite foil production system and / or the aforementioned composite current collector production line. In addition to being used independently for composite foil production or composite current collector production, the system can also be used as part of a battery production line, thereby coordinating the production of other materials and downstream processing to achieve battery production.

[0025] Compared with the prior art, the beneficial effects of the present application are as follows: based on the composite foil production system described in the present application, it is possible to simplify the production process, reduce the difficulty of operation, reduce the corresponding equipment cost and production cost; and facilitate the improvement of production efficiency and mass production. Including the thin film pretreatment micro-etching process, it can also improve the stability of the overall system and reduce costs based on the thin film substrate layer processing system. The composite foil or composite current collector produced can take into account improvements in multiple aspects, including stability, mechanical properties and uniformity, etc. Specifically, with respect to the device arrangement of the composite foil production system, the substrate layer and the foil layer can be processed or produced separately. In addition to the improvement of the product by the aforementioned separate processing, the relative independence of the processes of each layer is also improved, and the stability and maintainability of the overall composite foil production system are improved; at the same time, the coupling of the two processes is realized in the composite stage, and the composite effect is guaranteed. The overall system is efficient and flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of the film substrate processing layer system of this application (1).

[0027] Figure 2 This is a structural schematic diagram of the film substrate processing layer system of this application (II).

[0028] Figure 3 This is a structural schematic diagram of the film substrate processing layer system of this application (3).

[0029] Figure 4 This is a structural schematic diagram of the film substrate processing layer system of this application (IV).

[0030] Figure 5 This is a structural diagram of the film substrate processing layer system of this application (V).

[0031] Figure 6 This is a structural schematic diagram of the composite foil production system of Example 2 of the present application.

[0032] Figure 7 This is a structural schematic diagram of the composite foil production system of Example 3 of the present application.

[0033] Description of the drawings: Film substrate layer processing system 100, branch line guide roller 101, chemical micro-etching device 110, residue removal device 120, unwinding device 1100, compounding device 1200, pressure roller combination 1210, deflection roller 1220, foil material generating device 1300, cathode roller 1310, electrolytic cell 1320, passivation device 1400, winding device 1500, gluing device 1600, pre-curing device 1700. DETAILED DESCRIPTION

[0034] The drawings in this utility model are for illustrative purposes only and are not to be construed as limiting the scope of this utility model. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent the actual dimensions of the products. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments, and 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 in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0036] Example 1

[0037] This embodiment discloses a thin film substrate layer processing system 100, comprising: a chemical micro-etching device 110, which is at least used to micro-etch the surface of a thin film substrate layer. In this embodiment, the chemical micro-etching device 110 is at least used to chemically micro-etch the surface of a thin film substrate layer. The chemical micro-etching device 110 includes an etching chamber, a thin film substrate layer loading mechanism, and a chemical treatment agent application mechanism. The thin film substrate layer loading mechanism guides the thin film substrate layer into the etching chamber, and the chemical micro-etching liquid application mechanism located within the etching chamber applies the chemical treatment agent to the surface of the thin film substrate layer.

[0038] In this embodiment, the chemical micro-etching device 110 applies a chemical treatment agent to micro-etch the surface of the substrate layer; the chemical micro-etching device 110 includes a roller coating device, a spraying device and / or an immersion device. Among them, a corresponding chemical treatment agent storage space should be included. One of the roller coating device, the spraying device or the immersion device can be selected to apply the chemical treatment agent, such as Figures 1 to 3 The immersion device, roller coating device and spraying device shown in the figure, in addition, the system can also include a roller coating device, a spraying device and an immersion device at the same time, and then a plurality of branch guide rollers 101 are provided at least upstream of the chemical micro-etching device 110, and the plurality of branch guide rollers 101 are used to guide the film to the roller coating, spraying or immersion device respectively, as shown in the figure. Figure 4 As shown. That is, multiple routes of application are provided. In addition, multi-level application can also be achieved, such as Figure 5 As shown, the chemical treatment agent is applied through the soaking device and the spraying device respectively, and then enters the residue removal device 120.

[0039] In this embodiment, the film substrate layer processing system 100 further includes a residue removal device 120, which is disposed downstream of the chemical micro-etching device 110; the residue removal device 120 includes a squeeze device, a blow-drying device and / or a drying device, and the squeeze device, blow-drying device and drying device can be freely selected as needed to match the upstream chemical micro-etching device, such as Figures 1 to 3 The drying, squeezing, and blowing devices corresponding to the residue removal device 120 are shown in FIG. The residue removal device 120 removes components that have not yet been activated, preventing them from continuing to etch and impacting the composite, facilitating subsequent processing and composite processes. Furthermore, to improve removal efficiency, a scraper device can be provided upstream of the residue removal device 120 to initially scrape off some residual chemical treatment agent.

[0040] That is, in the production direction, the film is unwound and passes through the chemical micro-etching device 110 and the residue removal device 120 in sequence before being reeled in. When a scraper device is provided, the film is unwound and passes through the chemical micro-etching device 110, the scraper device and the residue removal device 120 in sequence before being reeled in.

[0041] Example 2

[0042] This embodiment discloses a composite foil production system, such as Figure 6 As shown, it includes: the film substrate layer processing system 100 of the aforementioned embodiment 1, a foil material generating device 1300, and a compounding device 1200, which are distributed in sequence from upstream to downstream, wherein the foil material generating device 1300 is at least used to generate a foil layer; the compounding device 1200 is used to compound the substrate layer and the foil layer to obtain a composite foil.

[0043] It also includes an unwinding device 1100 and a winding device 1500; the unwinding device 1100 is at least used to unwind the substrate layer; the winding device 1500 is at least used to wind up the composite foil layer; after the substrate layer is unwound from the unwinding device 1100, it passes through the film substrate layer processing system 100 and reaches between the composite device 1200 and the foil material generating device 1300 to form a composite foil material that is wound up by the winding device 1500.

[0044] In other words, the production process can be understood as follows: the unrolled film enters the film substrate layer processing system 100, then the chemically micro-etched film reaches the laminating device 1200, where the foil layer has been formed in the foil forming device 1300. The film then continues to be transported between the laminating device 1200 and the foil forming device, where it is composited with the foil layer on the foil forming device 1300 by the laminating device 1200, thereby obtaining a composite foil. Furthermore, after obtaining the composite foil, it can be further processed using, for example, a passivation device 1400 storing a passivation solution.

[0045] In this embodiment, the foil production device 1300 includes an electrolytic tank 1320 containing an electrolyte and a rotatable cathode roller 1310. A portion of the cathode roller 1310 can be immersed in the electrolyte to form a foil layer on the surface of the cathode roller 1310. When the foil layer is copper foil, for example, the foil production device 1300 can employ a conventional foil production machine.

[0046] The composite device 1200 includes a press roller assembly 1210 and a deflecting roller 1220. The press roller assembly 1210 and the surface of the cathode roller 1310 are configured such that, with the surface of the cathode roller 1310 serving as a support surface, the press roller assembly 1210 presses down on the substrate layer and the foil layer to produce a composite foil. The deflecting roller 1220 is used to pull the composite foil away from the surface of the cathode roller 1310. The press roller assembly 1210 is formed of two or more press roller assemblies, each comprising press rollers and a telescopic mechanism connecting the press rollers. The press roller assemblies in at least one press roller assembly 1210 are arranged circumferentially along the foil forming device.

[0047] In this embodiment, the substrate layer is PET film, PP film, PI film, PE film, PVC film, PBT film, PC film, PS film, ABS film, PA film, PASF film, PVDF film, PEDOT film, PANI film and PPy film.

[0048] Example 3

[0049] This embodiment discloses a composite foil production system, such as Figure 7 As shown, this embodiment differs from Example 2 only in that it further includes a glue coating device 1600, disposed between the film substrate layer processing system 100 and the foil material generating device. The glue coating device 1600 is configured to apply a glue layer to the surface of the film after it passes through the film substrate layer processing system 100. It also includes a pre-curing device 1700, disposed downstream of the glue coating device 1600 and configured to cure the glue layer on the film surface. The film sequentially passes through the film substrate layer processing system 100, the glue coating device 1600, and the pre-curing device 1700 before arriving at the laminating device 1200. In other words, in conjunction with the in-line chemical micro-etching described in Example 2, this embodiment can facilitate in-line glue coating for films with no or weak adhesion, thereby enabling the subsequent laminating process.

[0050] Example 4

[0051] This embodiment discloses a composite foil production system, differing from Embodiment 2 or 3 only in that it further includes a material transfer mechanism for transferring composite foil from a reeling device 1500 to an unreeling device 1100 and adjusting the unreeling of the composite foil so that the unreeled side faces the foil forming device 1300 upon reaching the reeling device 1200. The material transfer mechanism may be a robotic arm.

[0052] If the unwinding and rewinding processes in the composite foil production system of Example 2 or 3 achieve single-sided lamination, then when double-sided lamination is required, the material transfer mechanism can be used to transfer the material to the initial unwinding position, and the unreeled side can be used as the side to be laminated for unwinding and lamination, thereby repeating the single-layer lamination production structure twice to achieve double-sided lamination. More specifically, when the material transfer mechanism is used, it can be applied to the production process of the composite current collector.

[0053] Example 5

[0054] This embodiment discloses the application of the aforementioned embodiments 2, 3, or 4 in the production of composite current collectors. The composite foil production system described herein facilitates the production of composite current collectors that are stable and have excellent mechanical properties. The corresponding production process offers multiple advantages, including high efficiency and controllability.

[0055] Example 6

[0056] This embodiment discloses a composite current collector production line, including the composite foil production system of the aforementioned embodiment 2 or embodiment 3.

[0057] And this embodiment may include more than two of the above-mentioned composite foil production systems; the composite foil production system includes a unwinding device 1100, a film substrate layer processing system 100, a foil generating device 1300, a compounding device 1200, and a winding device 1500 distributed from upstream to downstream; the winding device 1500 of the upstream adjacent composite foil production system forms the unwinding device 1100 of the downstream adjacent composite foil production system; and the two composite foil production systems respectively composite the foil layers on both sides of the substrate layer.

[0058] When the composite foil production system achieves single-sided lamination, by setting up two or more continuous composite foil production systems and using the upstream winding device 1500 as the unwinding device 1100 of the downstream adjacent composite foil production system, the single-sided laminated foil can be used as the unwinding material, and the composite foil production process can be repeated for lamination on the unlaminated side. Double-sided lamination of the substrate layer can be achieved using two composite foil production systems.

[0059] Example 7

[0060] This embodiment discloses a battery production line, including the composite foil production system of Embodiment 2 or 3 described above; and / or the composite current collector production line of Embodiment 6 described above. In addition to being used independently for composite foil production or composite current collector production, it can also be used as part of a battery production line, thereby coordinating the production of other materials and downstream processing to achieve battery production.

[0061] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A composite foil production system, characterized in that: include: A film substrate layer processing system, a foil material generating device, and a composite device are sequentially distributed from upstream to downstream, wherein the film substrate layer processing system comprises: a chemical micro-etching device, which is at least used for micro-etching the surface of the film substrate layer; the foil material generating device, which is at least used for generating a foil layer; and the composite device, which is used for composite substrate layers and foil layers to obtain composite foils.

2. The composite foil production system according to claim 1, characterized in that: The chemical micro-etching device applies a chemical treatment agent to micro-etch the surface of the substrate layer; the chemical micro-etching device includes a roller coating device, a spraying device and / or an immersion device.

3. The composite foil production system according to claim 2, characterized in that: The film substrate layer processing system further comprises a residue removal device, which is arranged downstream of the chemical micro-etching device; the residue removal device comprises a squeezing device, a drying device and / or a drying device.

4. The composite foil production system according to claim 1, characterized in that: The foil material generating device includes a tank body for containing electrolyte and a rotatable cathode roller, and part of the cathode roller can be immersed in the electrolyte to form a foil layer on the surface of the cathode roller; and / or, the composite device includes a pressure roller combination and a deflection roller; the pressure roller combination and the cathode roller surface are configured as follows: with the cathode roller surface as the support surface, the pressure roller combination presses down the substrate layer and the foil layer to obtain a composite foil material; the deflection roller is used to pull the composite foil material away from the cathode roller surface; and / or, it also includes a glue coating device, which is arranged between the film substrate layer processing system and the foil material generating device, and the glue coating device is configured to coat the glue layer on the surface of the film after passing through the film substrate layer processing system.

5. The composite foil production system according to claim 4, characterized in that: It also includes a curing device, which is arranged downstream of the glue coating device and is configured to cure the glue layer on the surface of the film; the film passes through the film base material layer processing system, the glue coating device, and the curing device in sequence before reaching the composite device.

6. The composite foil production system according to any one of claims 1 to 5, characterized in that: It also includes an unwinding device and a winding device; the unwinding device is at least used to unwind the substrate layer; the winding device is at least used to wind up the composite foil layer; after the substrate layer is unwound from the unwinding device, it passes through the film substrate layer processing system and reaches between the composite device and the foil material generating device to form a composite foil material that is wound up by the winding device.

7. The composite foil production system according to claim 6, characterized in that: It also includes a material transfer mechanism for transferring the composite foil on the winding device to the unwinding device; and adjusting the unwinding of the composite foil so that the uncompounded side faces the foil generating device when it reaches the composite device.

8. The composite foil production system according to any one of claims 1 to 5, characterized in that: The substrate layer is PET film, PP film, PI film, PE film, PVC film, PBT film, PC film, PS film, ABS film, PA film, PASF film, PVDF film, PEDOT film, PANI film and PPy film.

9. A composite current collector production line, characterized in that: The composite foil production system comprises the composite foil production system according to any one of claims 1 to 8.

10. The composite current collector production line according to claim 9, characterized in that: It comprises two or more composite foil production systems as described above; the composite foil production system comprises an unwinding device, a film substrate layer processing system, a foil generating device, a compounding device, and a winding device distributed from upstream to downstream; the winding device of the upstream adjacent composite foil production system forms the unwinding device of the downstream adjacent composite foil production system; and the two composite foil production systems respectively composite the foil layers on different sides of the substrate layer.

11. A battery production line, characterized in that: It comprises the composite foil production system according to any one of claims 1 to 8; and / or the composite current collector production line according to any one of claims 9 to 10.

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