Composite system and composite method thereof

Abstract

A composite system comprises a compression roller combination, an abutting roller body and a guiding and separating roller, the compression roller combination is formed by two or more compression roller assemblies, and each compression roller assembly comprises a compression roller and a telescopic mechanism connected with the compression roller; the compression roller combination is at least used for transmitting a first material layer; a second material layer is carried on the surface of the abutting roller body, and the pressing roller combination and the surface of the abutting roller body are configured to jointly press the first material layer and the second material layer to obtain a composite material; the guiding and separating roller is used for pulling the composite material to leave the surface of the abutting roller body; when the compression roller combination is matched with the abutting roller body, the compression roller assembly is configured to enable the corresponding compression rollers to be matched with the surface of the abutting roller body to provide a pressing space, and the compression rollers in the compression roller combination are arranged in the circumferential direction of the surface of the abutting roller body. The compounding system can be suitable for compounding of thin and easily-broken materials, and the compounding quality is guaranteed. The composite current collector production system formed based on the composite system is simple in structure and convenient to deploy and install, and the obtained composite product has corresponding good performance.

Description

Technical Field

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

[0002] In the prior art, for the production of a composite material layer, different material layers are usually driven separately to a roll pair structure for lamination; for example, taking the lamination of two material layers as an example, usually one material layer reaches the roll pair after surface treatment, and the other layer reaches the roll pair simultaneously. The two layers of materials pass through the gap between the upper and lower rollers of the roll pair at the same time, and are laminated to each other in this gap to form a composite material layer. This type of lamination structure is suitable for the production of most composite materials, but there are deficiencies in the lamination during some production processes. This is particularly evident in the lamination of relatively thin and easily breakable material layers. For example, during the production of a composite current collector, when the metal foil layer is only a few micrometers thick, if the substrate and the foil layer are both driven to the roll pair for lamination, it is not easy to control the tension of the foil layer to keep it flat and laminated, and it is easy to tear during the driving process, making it inconvenient to achieve stable and normal production; if the tension control is weakened, it will affect the surface flatness of the composite product and directly affect the product quality. Moreover, for the aforementioned scenario, using the traditional roll pair lamination method, it is also inconvenient to adjust during the lamination process to obtain a well-laminated and surface-flat product.

[0003] For such materials, if the unwinding roll body or the carrying roll body that outputs the material layer, such as a cathode roll, can be directly used to avoid the transmission path for lamination, the adverse effects of the transmission of such material layers on production can be overcome. Therefore, there is an urgent need in the prior art for a composite system that directly laminates using a pressure roll device and a roll body / cylinder that releases the material layer. The pressure roll device can cooperate with the release of the wound material layer for direct lamination, and it is convenient to adaptively cooperate and adjust the lamination process as the wound material layer is released, overcoming the deficiencies of the traditional composite system in the prior art when dealing with the lamination of such thin and easily torn material layers. Summary of the Invention

[0004] The present invention aims to overcome at least one of the above deficiencies in the prior art, and provides a composite system and a composite method thereof, which can directly press and laminate with the wound material, and are suitable for the lamination of ultra-thin materials.

[0005] The technical solution adopted by the present invention is a composite system, including a press roller combination, a supporting roller body and a guiding roller. The press roller combination is formed by two or more press roller assemblies. Each press roller assembly includes a press roller and a telescopic mechanism connected to the press roller. The press roller combination is at least used to drive a first material layer. The surface of the supporting roller body carries a second material layer. The press roller combination and the surface of the supporting roller body are configured to jointly press the first material layer and the second material layer to obtain a composite material. The guiding roller is used to pull the composite material away from the surface of the supporting roller body. When the press roller combination cooperates with the supporting roller body, the press roller assembly is configured to make the corresponding press roller cooperate with the surface of the supporting roller body to provide a pressing space. And the press rollers in the press roller combination are arranged circumferentially along the surface of the supporting roller body.

[0006] The press roller assemblies are arranged circumferentially along the surface of the supporting roller body, which can adapt to the cylindrical side surface of a roller-shaped or wound material. When the first material layer travels between the press roller combination and the wound material, the first material layer can be pressed down onto the wound second material layer through the press roller combination and pressed downward toward the second material layer side to achieve the bonding between the first material layer and the second material layer. Further, the first material layer and / or the second material layer has adhesiveness. When at least two press roller assemblies are provided in the press roller combination, at least two areas of pressing are realized on the corresponding cylindrical side surface. On the one hand, it is convenient to extend the pressing time and improve the pressing quality on the premise of ensuring the continuous production of the material. On the other hand, it is also convenient to realize different area pressing settings according to the material characteristics. For the situation where the distance between the press roller combination and the supporting surface such as the surface of the roller body 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 for producing a metal foil layer on the surface, during the composite process, the distance between the press roller and the cathode roller hardly changes. However, the telescopic mechanism is not only extended to provide pressure when pressing is required, and its application scenarios are more extensive. For example, when the wound material is released during the composite process and the thickness of the wound material decreases, the diameter of the cylindrical structure including the loaded wound material decreases, and the following supporting roller body also includes such a cylindrical structure. At this time, the telescopic mechanism adjusts the extended length in a timely manner during the production process, adjusts the extended length as the material is released, to maintain the state of abutting against the corresponding supporting roller surface and ensure a relatively constant downward pressing pressure. Further, the press roller assemblies in the press roller combination are arranged circumferentially along the surface of the supporting roller body. At least in the contracted state of the telescopic mechanism, the telescopic mechanisms are also arranged circumferentially accordingly. This is beneficial to adopting the same telescopic mechanism to adapt to the pressing at multiple positions on the arc of the cylindrical side surface of the supporting roller body, and at the same time reducing the control difficulty of the corresponding device control program for different press roller assemblies.

[0007] Further, the composite system includes an integrated pressure roller device, and the pressure roller combination belongs to a part of the integrated pressure roller device. Further, the first material layer is a base material layer with adhesiveness on the surface; or, the first material layer is a base material layer with an adhesive layer coated on the surface. For the relatively thin second material layer, the first material layer with adhesiveness can peel the second material layer from the corresponding roller body immediately after pressing; for the formation of adhesiveness, it can be the adhesiveness existing on the surface of the first material layer itself, or it can be formed by coating an adhesive layer on the surface of the first material layer to use the adhesive layer to composite the second material layer. Further, the abutting roller body can be a cathode roller; and / or, the second material layer is a foil material such as copper foil.

[0008] Further, the pressure roller close to the upstream end in the pressure roller combination is a preliminary pressing roller, and the pressure roller close to the downstream end in the pressure roller combination is a finishing pressing roller; the pressing pressure F1 of the preliminary pressing roller in the pressure roller combination is greater than the pressing pressure F2 of the finishing pressing roller. The pressure includes the pressure when the corresponding pressure roller acts vertically on the surface of the abutting roller body. When all the composite materials to be processed reach the preliminary pressing roller for composite, the preliminary pressing roller provides a strong pressing pressure, so as to tightly press the composite layer in the initial fitting state, and keep the composite materials in the pressing area fully stretched, and squeeze the possible gaps or bubbles at the composite interface to the upstream input side and discharge them, so as to ensure that the composite interface of the composite layer passing through the preliminary pressing roller is completely fitted and basically does not contain obvious bubbles, gaps, etc., improving the composite quality; while the finishing pressing roller provides a pressing pressure F2 less than F1, which can avoid the excessive stretching caused by strong tensions on both the front and back sides of the composite layer, and avoid the wrinkles caused by elastic contraction after passing through the pressing section; at the same time, avoid the continuous accumulation of obvious air gaps, etc., because the composite layer passing through the preliminary pressing roller may still have very few air gaps that basically do not affect the performance of the composite layer microscopically. If the finishing pressing roller also maintains a strong pressing pressure, it may squeeze the air gaps upstream, that is, between the preliminary pressing roller and the finishing pressing roller, and with the progress of the production process, obvious bubbles or wrinkles will be continuously accumulated in multiple areas of the composite layer finished product, which will significantly affect the quality of the finally formed product. On the other hand, setting F2 < F1 is also beneficial to the derivation and separation of the composite layer. The reduction of the pressing pressure of the finishing pressing roller compared with the upstream one is beneficial to reducing the fitting degree of the wound material on the corresponding abutting roller body, facilitating the separation of the wound material that has been composite from the corresponding roller body along the transmission direction. If F2 is a strong pressing pressure, it may be that as the material advances, the wound material is easily pasted on the corresponding abutting roller body, and with the transmission of the material, it is easy to tear when deriving the composite layer due to uneven force.

[0009] Further, the press roll combination includes more than three press rolls, including a preliminary pressing roll, a finishing pressing roll, and more than one intermediate pressing roll located between the preliminary pressing roll and the finishing pressing roll; in the press roll combination, the pressing force F1 of the preliminary pressing roll is configured to be greater than the pressing force F2 of the finishing pressing roll, and the pressing force F1 of the preliminary pressing roll is greater than the pressing force F3 of the intermediate pressing roll. Further, F3≥F2. Even further, in the press roll combination, the pressing roll assembly is configured such that F1>F3>F2, and the pressing force decreases in the direction from preliminary pressing to finishing pressing, with the decreasing ratio ranging from 3% to 20%; that is, F1×3%<F1-F3<F1×20%, F3×3%<F3-F2<F3×20%. Even 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 0.1N / in~10N / in (0.1N per inch to 10N per inch).

[0010] The preliminary pressing roll applies a relatively large pressing force at the initial stage of lamination, causing the pressing area in the downward pressing region to be concentratedly stressed so as to fully laminate while preventing air bubbles from entering. The finishing pressing roll assists in lamination to enhance the bonding strength of the composite layer. In addition to extending the lamination area of the composite layer during travel, the finishing pressing roll can also slowly release the composite layer, thereby promoting its detachment from the abutting roll body and being led out. The intermediate pressing roll can at least also play an auxiliary pressing role like the finishing pressing roll. Preferably, its pressing force F3 is also less than F1. As an intermediate pressing roll, it can increase the auxiliary pressing area and further improve the lamination effect. Combining with F3 being less than F1, it can cooperate with the preliminary pressing roll and the finishing pressing roll to achieve a progressive slowdown in pressing and release. It provides a more diverse adjustment process, facilitating selective adjustment according to the material characteristics and lamination requirements. Further, the diameter range of the press rolls in the press roll combination is 120~200mm. And the surface hardness H1 of the preliminary pressing roll is greater than the surface hardness H2 of the finishing pressing roll; the surface hardness H1 of the preliminary pressing roll is greater than the surface hardness H3 of the intermediate pressing roll. Further, H3≥H2; further, H1≥45 degrees; even further, 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 roll includes the rubber hardness on the surface of the roll body, which is the Shore A hardness; different surface hardnesses of the rolls correspond to different acting areas, and setting them as the aforementioned H1, H3, and H2 can further significantly improve the lamination effect.

[0011] Further, the abutting roll body is a cathode roll; the second material layer is a foil layer; and / or, the first material layer is a base material layer with adhesiveness on its surface; and / or, the first material layer is a base material layer with a glue layer on its surface.

[0012] Further, it further includes an inlet roller disposed upstream of the pressure roller assembly, and the inlet roller is disposed adjacent to the pressure roller assembly, and a height adjustment mechanism is connected to the end of the inlet roller. By adjusting the height of the inlet roller through the height adjustment mechanism, the entry angle of the material reaching the pressure roller assembly can be adjusted, and further adjustment can be made according to actual production requirements to adapt to different usage scenarios. Further, the inlet roller is disposed adjacent to the pressure roller assembly, and a height adjustment mechanism is connected to the end of the inlet roller. Further, the height adjustment mechanism is a screw adjustment mechanism for adjusting the position of the inlet roller in the vertical direction.

[0013] Further, the telescopic mechanism of the pressure roller assembly in the pressure roller combination is configured to make the corresponding pressure roller telescopic in the direction perpendicular to the surface of the abutting roller body. The pressure roller under the telescopic mechanism can act vertically on the corresponding abutting surface. In addition to avoiding slipping and other conditions that may be caused by deviation of the acting direction, it is also beneficial to accurately detect the corresponding pressure or tension, etc., and then facilitate accurate control and maintenance of the pressure required for stable pressing and the extension length of the telescopic mechanism. Further, the pressure roller combination is disposed above the abutting roller body. At this time, the part of the winding material to be laminated is located above the abutting roller body, and the material maintains a stretched state on the surface of the corresponding winding cylinder due to gravity, which is beneficial to obtaining a flat laminated layer during lamination and avoiding large voids, wrinkles, etc. at the lamination interface; if it is disposed below, the released winding material may be in a state of tending to be suspended, and some areas may collapse downward due to gravity, which is not conducive to flat and tight lamination. Further, the pressure roller combination is disposed obliquely above the abutting roller body. That is, the integrated pressure roller device only needs to be opposite to a part of the abutting roller body, which can reduce the size of the integrated pressure roller device in the transverse direction, and then reduce the bearing length and weight of the corresponding mounting bracket. In addition to reducing costs, it is also beneficial to installation, layout and maintenance, and is convenient to operate in cooperation with the shape of the abutting roller body.

[0014] Further, a tension sensor is connected to the end of the pressure roller. Further, a pressure sensor is also connected to the pressure roller assembly. Further still, both a pressure sensor and a tension sensor are connected to the pressure roller assembly. This is beneficial to real-time monitoring of the corresponding pressing state and accurate control of the roller running and pressing process.

[0015] Further, the pressure roller combination is disposed above the abutting roller body. Further, the pressure roller combination is disposed obliquely above the abutting roller body.

[0016] Further, it further includes a mounting bracket, and the mounting bracket includes a support beam and side plates on both sides of the support beam; the press roller assembly is installed between the side plates; and the lower side of the side plates is an inclined surface, and the height of the lower edge of the front side of the side plates is higher than the height of the lower edge of the rear side of the side plates. Further, the side plates are in a trapezoidal structure. In the direction from the front side to the rear side, the press rollers in the press roller assembly are arranged in a decreasing height order, and the press rollers are connected with a telescopic mechanism. When the telescopic mechanism is in a contracted state, the lower edge of the press roller is lower than the lower edge of the corresponding position of the side plate. Further, the shape of the side plates is matched with the upper side of the cathode roller. Further, the shape of the side plates is matched with the obliquely upper side of the cathode roller.

[0017] Another object of the present invention is to provide a composite current collector production system, including the aforementioned composite system. Further, it further includes an unwinding device upstream of the composite system. Further, it further includes a passivation tank, a squeezing roller, a spraying chamber, a hot air device, a drying chamber and / or a slitting device downstream of the composite system.

[0018] The composite current collector production system described in this application can composite the base material and the metal foil layer based on the direct bonding method, with low cost and convenient for mass production; and for the ultra-thin metal foil layer, it can also be flatly attached to maintain the integrity of the material layer and avoid tearing and other conditions caused by the transmission of micron-level foil materials; it is easy to obtain a composite current collector with tight fitting, flatness and stable performance. Further, after obtaining the composite current collector, passivation can be further carried out, the excess passivation liquid is squeezed out by the squeezing roller, and then further processed through spraying and cleaning, hot air / drying, etc., so as to obtain a composite current collector that can be actually put into use.

[0019] Another object of the present invention is to provide a composite method based on the aforementioned composite system. The press roller assembly closest to the upstream end in the press roller assembly is the preliminary pressing roller, and the press roller assembly closest to the downstream end is the finishing pressing roller; the method includes the steps: A1. Traction the first material layer through the press roller assembly and the guiding roller; A2. The preliminary pressing roller presses down the first material layer onto the second material layer on the surface of the abutting roller body, and with the surface of the abutting roller body as the supporting surface, the preliminary pressing roller presses down to press and combine the first material layer and the second material layer, and maintains the pressing pressure F1; and as the first material layer is transmitted on the press roller assembly, the abutting roller body rotates cooperatively to continuously release the second material layer; A3. The finishing pressing roller assists in pressing down the composite first material layer and second material layer onto the surface of the abutting roller body, and maintains the pressing pressure F2; further, in step A3, the finishing pressing roller and the preliminary pressing roller in A2 press down simultaneously; or, in step A3, the finishing pressing roller presses down immediately after the preliminary pressing roller in step A2; The guiding roller drives the composite first material layer and second material layer that have passed through the press roller assembly away from the surface of the abutting roller body; F1 > F2.

[0020] Based on the composite method described in this application, it is convenient to obtain a multi-layer structured composite current collector, and the composite material layers are tightly combined, not easily separated, and the composite interface is flat; it has good composite current collector performance.

[0021] Further, after the preliminary pressing roller presses down, the first material layer tightly adheres to the second material layer. After passing through the guiding roller, the composite first material layer and second material layer move away from the abutting roller body.

[0022] Further, the pressing roller is connected with a tension sensor; in step A1, when the pressing roller combination drives the first material layer, the tension of the first material layer passing through the surface of the pressing roller combination is continuously monitored and fed back to the device upstream that conveys the first material layer to maintain a constant tension of the first material layer; and / or, in step A2, while the preliminary pressing roller presses down, the tension sensor feeds back to the device upstream that conveys the first material layer to maintain a constant tension of the first material layer while cooperating with the downward pressing action of the preliminary pressing roller.

[0023] Further, the composite system further includes an introducing roller disposed upstream of the pressing roller combination, and the introducing roller is disposed adjacent to the pressing roller combination. The end of the introducing roller is connected with a height adjusting mechanism; before step A1 or in step A1, it further includes: step A1a, adjusting the height of the introducing roller through the height adjusting mechanism to adjust the entering angle of the first material layer before the pressing roller combination and / or the initial tension passing through the pressing roller combination.

[0024] Further, in the composite system, the pressing roller combination includes more than three pressing rollers, including a preliminary pressing roller, a final pressing roller, and more than one intermediate pressing roller located between the preliminary pressing roller and the final pressing roller; in step A3, the intermediate pressing roller and the final pressing roller assist in pressing the composite first material layer and second material layer onto the surface of the abutting roller body. The intermediate pressing roller maintains a downward pressing pressure of F3, and the final pressing roller maintains a downward pressing pressure of F2; and in step A3, the intermediate pressing roller, the final pressing roller and the preliminary pressing roller in A2 press down simultaneously; or, in step A3, the intermediate pressing roller presses down immediately after the preliminary pressing roller in A2, and the final pressing roller presses down immediately after the intermediate pressing roller. Further, the downward pressing pressure F1 of the preliminary pressing roller > the downward pressing pressure F2 of the final pressing roller; the downward pressing pressure F1 of the preliminary pressing roller > the downward pressing pressure F3 of the intermediate pressing roller. Furthermore, the downward pressing pressure F1 of the preliminary pressing roller > the downward pressing pressure F3 of the intermediate pressing roller > the downward pressing pressure F2 of the final pressing roller.

[0025] Further, in step A2, before the preliminary pressing roller presses down, the abutting roller body rotates to make the second material layer face the pressing roller combination; after the abutting roller body comes into contact with the second material layer and the first material layer, the abutting roller body continues to rotate to release the second material layer for cooperation in composite.

[0026] Further, it further includes step A4 of shrinking the roller assemblies in the systolic roller combination to end the lamination process. Further, in the direction from upstream to downstream, the roller assemblies in the systolic roller combination are sequentially shrunk to end the lamination process.

[0027] Compared with the prior art, the beneficial effects of the present application are as follows: The lamination system can be applied to the lamination of thinner and easily breakable materials, including metal foil layers less than a micron or several microns in the laminated current collector; using the roller body carrying the winding material as a support, and using materials with viscosity or direct bonding ability to laminate and guide away the ultra-thin and easily breakable winding materials; avoiding the risks brought by the transmission of such materials, so as to achieve stable lamination and production. Among them, in the lamination system and the corresponding lamination method, the cooperation between the roller combination and the abutting roller body can extend the lamination time and improve the lamination quality on the premise of ensuring the continuous production of materials; it is also convenient to realize different regional lamination settings according to the material characteristics; and the applicable scenarios are wide. Lamination is achieved on the premise of avoiding the transmission of ultra-thin materials, so as to obtain high-quality composite materials with tight lamination and smooth surface. Direct lamination and derivation are carried out by using the roller combination, the abutting roller body and the guiding roller, and the roller device can cooperate with the release of the winding material layer for direct lamination, and is convenient to adaptively adjust the lamination process with the release of the winding material layer, overcoming the deficiencies of the traditional lamination system in the prior art when dealing with the lamination of such thinner and easily torn material layers. Moreover, the lamination quality can be improved through different configurations of the roller combination; including preliminary strong pressure lamination for exhaust, and subsequent gradually slowing down of lamination and release. Based on the lamination system, it can promote the complete adhesion of the composite interface of the composite layer, and basically does not contain obvious bubbles, gaps and other conditions, improving the lamination quality. The laminated current collector production system formed based on the lamination system has a simple structure, is convenient for deployment and installation, and the obtained composite product has corresponding good performance. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the running roller lamination structure of the lamination system of the present application.

[0029] Figure 2 It is a schematic diagram of the structure of the lamination system of the present application.

[0030] Figure 3 It is a schematic diagram (I) of the integrated roller device structure of the present application.

[0031] Figure 4 It is a schematic diagram (II) of the integrated roller device structure of the present application.

[0032] Figure 5 It is a schematic diagram (III) of the integrated roller device structure of the present application.

[0033] Figure 6 It is a schematic diagram (I) of the cooperation structure of the lamination system of the present application.

[0034] Figure 7Schematic diagram (II) of the cooperation structure of the composite system of the present application.

[0035] Description of the drawings: Composite system 3000, integrated roller device 3100, roller combination 3120, roller 31211, telescopic mechanism 31212, abutting roller body 4100, tension sensor 1141, preliminary pressing roller 3121A, finishing pressing roller 3121B, transition pressing roller 3121C, guiding roller 3103, guiding roller 3101, height adjusting mechanism 3102, support beam 3111, side plate 3112, first material layer 5100, second material layer 5200, composite layer 5300. Detailed implementation manners

[0036] The drawings of the present invention are only for illustrative purposes and should not be construed as a limitation of the present invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0037] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings and specific implementation manners. However, those skilled in the art will understand that the following described embodiments are some embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention and should not be regarded as a limitation of 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 creative efforts shall fall within the protection scope of the present invention. Those conditions not specified in the embodiments are carried out according to the conventional conditions or the conditions recommended by the manufacturer. Those reagents or instruments not specified in the manufacturer are all conventional products that can be obtained through commercial purchase. Embodiment 1

[0038] As Figures 1 to 5As shown in the figure, this embodiment discloses a composite system 3000, which includes a pressure roller assembly 3120, a holding roller body 4100, and a guiding roller 3103. The pressure roller assembly 3120 is formed by two or more pressure roller components. The pressure roller component includes a pressure roller 31211 and a telescopic mechanism 31212 connected to the pressure roller 31211. The pressure roller assembly 3120 is at least used to drive the first material layer 5100. The surface of the holding roller body 4100 carries a second material layer 5200. The surface of the pressure roller assembly 3120 and the holding roller body 4100 are configured to jointly press the first material layer 5100 and the second material layer 5200 to obtain a composite material. The guiding roller 3103 is used to pull the composite material away from the surface of the holding roller body 4100. When the pressure roller assembly 3120 cooperates with the holding roller body 4100, the pressure roller component is configured to make the corresponding pressure roller 31211 cooperate with the surface of the holding roller body 4100 to provide a pressing space. And the pressure rollers 31211 in the pressure roller assembly 3120 are arranged circumferentially along the surface of the holding roller body 4100. The pressure roller components are arranged circumferentially along the surface of the holding roller body 4100, which can adapt to the cylindrical side surface of the roller-shaped or wound material. When at least two pressure roller components are provided in the pressure roller assembly 3120, at least two areas of pressing are realized on the corresponding cylindrical side surface. When the first material layer 5100 travels between the pressure roller assembly 3120 and the wound material, the first material layer 5100 can be pressed down onto the wound second material layer 5200 through the pressure roller assembly 3120 and pressed downward toward the second material layer 5200 to achieve the adhesion between the first material layer 5100 and the second material layer 5200. In this embodiment, the first material layer 5100 has adhesiveness, so that it can be directly compounded with the second material layer 5200. The pressure roller components in the pressure roller assembly 3120 are arranged circumferentially along the surface of the holding roller body 4100. At least in the contracted state of the telescopic mechanism 31212, the telescopic mechanisms 31212 are also arranged circumferentially accordingly. Specifically, in this embodiment, to improve the compounding effect, the telescopic mechanism 31212 is configured to make the corresponding pressure roller 31211 telescopic in the direction perpendicular to the surface of the holding roller body 4100. The pressure roller 31211 under the telescopic mechanism 31212 can act vertically on the corresponding abutting surface. The pressure roller component is also connected with a tension sensor 1141, which is convenient for monitoring the corresponding tension state when the material runs on the pressure roller assembly 3120 to ensure a flat compounding effect. The guiding roller 3103 is arranged downstream of the pressure roller assembly 3120. And the guiding roller 3103 is used to guide away the material after passing through the pressure roller assembly 3120, that is, to guide away the compounded composite layer 5300 to the downstream production process.

[0039] Specifically, in this embodiment, the composite system 3000 includes an integrated roller device 3100, and the roller assembly 3120 is part of the integrated roller device 3100. The first material layer 5100 is a substrate layer with adhesiveness on its surface, or the first material layer 5100 is a substrate layer with an adhesive layer coated on its surface. For the relatively thin second material layer 5200, the adhesive first material layer 5100 can peel the second material layer 5200 from the corresponding roller body after pressing; for the formation of adhesiveness, it can be the adhesiveness inherent in the surface of the first material layer 5100 itself, or it can be formed by coating an adhesive layer on the surface of the first material layer 5100 to laminate the second material layer 5200 with the adhesive layer. The abutting roller body 4100 can be a cathode roller; the second material layer 5200 is a foil material such as copper foil. For example, when the first material layer 5100 is transmitted to the lower side of the integrated roller device 3100, at this time, the first material layer 5100 is transmitted continuously downstream along the lower surface of the roller assembly 3120; the integrated roller device 3100 is arranged obliquely above the cathode roller of the abutting roller body 4100, and the second material layer 5200 is formed on the surface of the cathode roller; when pressing is required, the roller assembly 3120 of the integrated roller device 3100 presses the first material layer 5100 toward the second material layer 5200 side to bond the first material layer 5100 and the second material layer 5200. As the first material layer 5100 is continuously transmitted, the second material layer 5200 on the cathode roller is continuously formed and continuously transmitted, and the second material layer 5200 that has been bonded to the first material layer 5100 moves with the transmission of the first material layer 5100 and peels off the surface of the cathode roller.

[0040] Such as Figures 1 to 2As shown, in this embodiment, the nip roll 31211 near the upstream end in the nip roll assembly 3120 is the preliminary nip roll 3121A, and the nip roll 31211 near the downstream end in the nip roll assembly 3120 is the finishing nip roll 3121B; the nip roll assembly in the nip roll assembly 3120 is configured such that the downward pressure F1 of the preliminary nip roll 3121A > the downward pressure F2 of the finishing nip roll 3121B. When the composite material to be processed reaches the preliminary nip roll 3121A for lamination, the preliminary nip roll 3121A provides a strong lamination pressure, so as to tightly laminate the composite layer 5300 in the initial lamination state, maintain sufficient stretching of the composite material in the lamination area, and squeeze and discharge the possible gaps or bubbles at the composite interface to the upstream input side, thereby ensuring that the composite interface of the composite layer 5300 passing through the preliminary nip roll 3121A is completely laminated and basically free of obvious bubbles, gaps, etc., improving the lamination quality; while the finishing nip roll 3121B provides a lamination pressure F2 less than F1, which can avoid excessive stretching caused by strong tensions on both the front and back sides of the composite layer 5300, and avoid wrinkles caused by elastic contraction after passing through the lamination section; F2 < F1 is also beneficial to the export and separation of the composite layer 5300. The reduction of the lamination pressure of the finishing nip roll 3121B compared to the upstream one is beneficial to reducing the lamination degree of the wound material on the corresponding abutting roll body 4100, facilitating the separation of the wound material that has been laminated from the corresponding roll body along the transmission direction.

[0041] In order to improve the lamination effect, in this embodiment, the roller combination 3120 includes more than three rollers 31211, including a preliminary lamination roller 3121A, a final lamination roller 3121B, and more than one intermediate lamination roller 3121C located between the preliminary lamination roller 3121A and the final lamination roller 3121B; the roller assemblies in the roller combination 3120 are configured such that the downward pressure F1 of the preliminary lamination roller 3121A > the downward pressure F2 of the final lamination roller 3121B, and the downward pressure F1 of the preliminary lamination roller 3121A > the downward pressure F3 of the intermediate lamination roller 3121C. More specifically, the roller assemblies in the roller combination 3120 are configured to be telescopic such that the downward pressure F1 of the preliminary lamination roller 3121A > the downward pressure F3 of the intermediate lamination roller 3121C > the downward pressure F2 of the final lamination roller 3121B. The intermediate lamination roller 3121C can at least also play an auxiliary lamination role for the final lamination roller 3121B. Preferably, its downward pressure F3 is also less than F1. As the intermediate lamination roller 3121C in the middle, it can increase the auxiliary lamination area and further improve the lamination effect. It provides a more diverse adjustment process, facilitating selective adjustment in accordance with the material characteristics and lamination requirements. Further, F3≥F2. Furthermore, F1>F3>F2, and the downward pressure decreases in the direction from preliminary lamination to final lamination, and the decreasing ratio ranges from 3% to 20%; that is, F1×3%<F1-F3<F1×20%, F3×3%<F3-F2<F3×20%. Furthermore, 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 per inch to 10 N per inch). Further, the diameter range of the rollers in the roller combination is 120 to 200 mm.

[0042] And the surface hardness H1 of the preliminary lamination roller > the surface hardness H2 of the final lamination roller; the surface hardness H1 of the preliminary lamination roller > the surface hardness H3 of the intermediate lamination roller. Further, H3≥H2; further, H1≥45 degrees; furthermore, H1>H3>H2. And the range of H1 is 45 to 55 degrees; the range of H3 is 35 to 45 degrees; the range of H2 is 25 to 35 degrees.

[0043] It further includes a guiding roller 3101 provided upstream of the roller combination 3120, and the guiding roller 3101 is arranged adjacent to the roller combination 3120. A height adjustment mechanism 3102 is connected to the end of the guiding roller 3101. The height adjustment mechanism 3102 is a screw adjustment mechanism for adjusting the position of the guiding roller 3101 in the vertical direction.

[0044] Specific to the arrangement of the pressure roller combination 3120, the integrated pressure roller device 3100 of this embodiment further includes a mounting bracket, and the mounting bracket includes a support beam 3111 and side plates 3112 on both sides of the support beam 3111; the pressure roller combination 3120 is installed between the side plates 3112; and the lower side of the side plate 3112 is an inclined surface, and the height of the lower edge of the front side of the side plate 3112 is higher than the height of the lower edge of the rear side of the side plate 3112. Specifically, the side plate 3112 has a trapezoidal structure; the shape of the side plate 3112 is matched with the upper inclined side of the cathode roller. When the telescopic mechanism 31212 is in the contracted state, the lower edge of the pressure roller 31211 is lower than the lower edge of the corresponding position of the side plate 3112. Embodiment 2

[0045] This embodiment discloses a composite current collector production system, including the composite system 3000 of the foregoing Embodiment 1. It further includes an unwinding device upstream of the composite system 3000, and a passivation tank, a squeezing roller, a spraying chamber, a hot air device, a drying chamber, and a slitting device downstream of the composite system 3000.

[0046] The composite current collector production system described in this application can composite the base material and the metal foil layer based on the direct bonding method, with low cost and easy for mass production; and for the ultra-thin metal foil layer, it can also be flatly attached to maintain the integrity of the material layer and avoid tearing and other conditions caused by the transmission of micron-level foil materials; it is easy to obtain a composite current collector with tight fitting, flatness, and stable performance.

[0047] After obtaining the composite layer 5300, passivation is further carried out, the excess passivation liquid is squeezed out by a squeezing roller, and then further processed through spraying and cleaning, hot air / drying, etc., so as to obtain a composite current collector that can be actually put into use. Embodiment 3

[0048] This embodiment discloses a composite method based on the composite system 3000 of the foregoing Embodiment 1. The pressure roller assembly near the upstream end in the pressure roller combination 3120 is the preliminary pressing roller 3121A, and the pressure roller assembly near the downstream end is the finishing pressing roller 3121B; the method includes the steps: A1. Traction the first material layer 5100 through the pressure roller combination 3120 and the guiding roller 3103; A2. The preliminary pressing roller 3121A presses down the first material layer 5100 onto the second material layer 5200 on the surface of the abutting roller body 4100, and with the surface of the abutting roller body 4100 as the supporting surface, the preliminary pressing roller 3121A presses down the first material layer 5100 and the second material layer 5200, and maintains the pressing pressure F1; and as the first material layer 5100 is transmitted on the pressure roller combination 3120, the abutting roller body 4100 rotates continuously to release the second material layer 5200; The tail - end pressing roller 3121B assists in pressing the first material layer 5100 and the second material layer 5200 together against the surface of the abutting roller body 4100 and maintains the downward pressing force F2. The guiding roller 3103 drives the first material layer 5100 and the second material layer 5200 that have been compounded by the roller combination 3120 away from the surface of the abutting roller body 4100. Specifically, after the preliminary pressing roller 3121A presses down, the first material layer 5100 adheres tightly to the second material layer 5200. Then, after passing through the subsequent tail - end pressing roller 3121B and the guiding roller 3103, the compounded first material layer 5100 and second material layer 5200, that is, the compound layer 5300, moves away from the abutting roller body 4100. Among them, F1 > F2.

[0049] The compounding system 3000 further includes an introducing roller 3101 disposed upstream of the roller combination 3120, and the introducing roller 3101 is adjacent to the roller combination 3120. A height - adjusting mechanism 3102 is connected to the end of the introducing roller 3101. Before step A1 or during step A1, it further includes: step A1a, adjusting the height of the introducing roller 3101 through the height - adjusting mechanism 3102 to adjust the entering angle of the first material layer 5100 before the roller combination 3120 and / or the initial tension of the first material layer 5100 passing through the roller combination 3120.

[0050] The pressing roller 31211 is connected with a tension sensor 1141. During step A1, when the roller combination 3120 drives the first material layer 5100, the tension of the first material layer 5100 passing through the surface of the roller combination 3120 is continuously monitored and fed back to the device that conveys the first material layer 5100 upstream to maintain a constant tension of the first material layer 5100; and / or, during step A2, while the preliminary pressing roller 3121A presses down, the tension sensor 1141 feeds back to the device that conveys the first material layer 5100 upstream to maintain a constant tension of the first material layer 5100 while cooperating with the downward - pressing action of the preliminary pressing roller 3121A.

[0051] During step A2, before the preliminary pressing roller 3121A presses down, the abutting roller body 4100 rotates to make the second material layer 5200 face the roller combination 3120. After the abutting roller body 4100 comes into contact with the second material layer 5200 and the first material layer 5100, the abutting roller body 4100 continues to rotate to release the second material layer 5200 for compounding.

[0052] Specifically, in step A3, the final pressing roller 3121B and the preliminary pressing roller 3121A in A2 are pressed down simultaneously; or, in step A3, the final pressing roller 3121B is pressed down immediately after the preliminary pressing roller 3121A in A2. Based on the composite method described in this embodiment, it is convenient to obtain a multi-layer structured composite current collector, and the composite material layers are tightly combined, not prone to detachment, and the composite interface is flat; it has good performance of the composite current collector.

[0053] When the roller combination 3120 in the composite system 3000 includes more than three rollers 31211, that is, it includes a preliminary pressing roller 3121A, a final pressing roller 3121B, and more than one intermediate pressing roller 3121C located between the preliminary pressing roller 3121A and the final pressing roller 3121B, in step A3, the intermediate pressing roller 3121C and the final pressing roller 3121B assist in pressing the first material layer 5100 and the second material layer 5200 to be composite against the surface of the abutting roller body 4100. The intermediate pressing roller 3121C maintains a pressing pressure F3, and the final pressing roller 3121B maintains a pressing pressure F2; and in step A3, the intermediate pressing roller 3121C, the final pressing roller 3121B and the preliminary pressing roller 3121A in A2 are pressed down simultaneously; or, in step A3, the intermediate pressing roller 3121C is pressed down immediately after the preliminary pressing roller 3121A in A2, and the final pressing roller 3121B is pressed down immediately after the intermediate pressing roller 3121C. More specifically, the pressing pressure can be configured such that the pressing pressure F1 of the preliminary pressing roller 3121A > the pressing pressure F2 of the final pressing roller 3121B; the pressing pressure F1 of the preliminary pressing roller 3121A > the pressing pressure F3 of the intermediate pressing roller 3121C; further, the pressing pressure F1 of the preliminary pressing roller 3121A > the pressing pressure F3 of the intermediate pressing roller 3121C > the pressing pressure F2 of the final pressing roller 3121B. To achieve a progressive slow pressing.

[0054] It further includes step A4, contracting the roller assemblies in the shrinkage roller combination 3120 to end the composite process. In this embodiment, in the direction from upstream to downstream, the roller assemblies in the shrinkage roller combination 3120 are sequentially contracted to end the composite process.

[0055] Obviously, the above 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, and improvements 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 system, characterized in that, It includes a pressure roller combination, a supporting roller body and a guiding roller. The pressure roller combination is formed by two or more pressure roller assemblies. Each pressure roller assembly includes a pressure roller and a telescopic mechanism connected to the pressure roller. The pressure roller combination is at least used to drive the first material layer. The surface of the supporting roller body carries a second material layer. The pressure roller combination and the surface of the supporting roller body are configured to jointly press the first material layer and the second material layer to obtain a composite material. The guiding roller is used to pull the composite material away from the surface of the supporting roller body. When the pressure roller combination cooperates with the supporting roller body, the pressure roller assembly is configured to make the corresponding pressure roller cooperate with the surface of the supporting roller body to provide a pressing space. And the pressure rollers in the pressure roller combination are arranged circumferentially along the surface of the supporting roller body.

2. The composite system according to claim 1, characterized in that, Among the pressure roller combination, the pressure roller near the upstream end is the preliminary pressing roller, and the pressure roller near the downstream end is the finishing pressing roller. In the pressure roller combination, the pressure roller assembly is configured such that the downward pressure F1 of the preliminary pressing roller > the downward pressure F2 of the finishing pressing roller.

3. The composite system according to claim 2, wherein The pressure roller combination includes three or more pressure rollers, including a preliminary pressing roller, a finishing pressing roller, and more than one intermediate pressing roller located between the preliminary pressing roller and the finishing pressing roller. In the pressure roller combination, the pressure roller assembly is configured such that the downward pressure F1 of the preliminary pressing roller > the downward pressure F2 of the finishing pressing roller, and the downward pressure F1 of the preliminary pressing roller > the downward pressure F3 of the intermediate pressing roller; and / or, the pressure roller assembly in the pressure roller combination is configured such that the downward pressure F1 of the preliminary pressing roller > the downward pressure F3 of the intermediate pressing roller > the downward pressure F2 of the finishing pressing roller, and the downward pressures of the preliminary pressing roller, the intermediate pressing roller, and the finishing pressing roller decrease in sequence, and the decreasing ratio ranges from 3% to 20%.

4. The composite system according to claim 3, characterized in that, The surface hardness H1 of the preliminary pressing roller > the surface hardness H2 of the finishing pressing roller; the surface hardness H1 of the preliminary pressing roller > the surface hardness H3 of the intermediate pressing roller.

5. The composite system according to any one of claims 1 to 4, characterized in that, The supporting roller body is a cathode roller; the second material layer is a foil material; and / or, the first material layer is a base material layer with adhesiveness on the surface; and / or, the first material layer is a base material layer with a glue layer on the surface.

6. The composite system according to any one of claims 1 to 4, characterized in that, In the pressure roller combination, the telescopic mechanism of the pressure roller assembly is configured to make the corresponding pressure roller telescopic in the direction perpendicular to the surface of the supporting roller body.

7. A composite current collector production system, characterized in that It includes the composite system according to any one of claims 1 to 6.

8. The composite method based on the composite system according to any one of claims 1 to 6, characterized in that, Among the pressure roller combination, the pressure roller assembly near the upstream end is the preliminary pressing roller, and the pressure roller assembly near the downstream end is the finishing pressing roller. It includes steps: A1. Pull the first material layer through the pressure roller combination and the guiding roller. A2. The preliminary pressing roller presses the first material layer onto the second material layer on the surface of the supporting roller body. With the surface of the supporting roller body as the supporting surface, the preliminary pressing roller presses and combines the first material layer and the second material layer, and maintains the downward pressure F1. And as the first material layer is driven on the pressure roller combination, the supporting roller body cooperates and rotates continuously to release the second material layer. A3. The finishing pressing roller assists in pressing the composite first material layer and second material layer onto the surface of the supporting roller body, and maintains the downward pressure F2. The guiding roller drives the first material layer and the second material layer that have been combined after passing through the pressure roller combination away from the surface of the supporting roller body. Wherein, F1 > F2.

9. The composite method according to claim 8, wherein The pressure roller is connected with a tension sensor; in step A1, when the pressure roller combination drives the first material layer, continuously monitor the tension of the first material layer passing through the surface of the pressure roller combination and feed it back to the equipment that conveys the first material layer upstream to maintain a constant tension of the first material layer; and / or, in step A2, while the preliminary pressing roller presses down, the tension sensor feeds back to the equipment that conveys the first material layer upstream to maintain a constant tension of the first material layer while cooperating with the pressing-down action of the preliminary pressing roller.

10. The composite method according to any one of claims 8 to 9, characterized in that, In step A2, before the preliminary pressing roller presses down, the abutting roller body rotates until the second material layer faces the pressure roller combination; after the abutting roller body comes into contact with the second material layer and the first material layer, the abutting roller body continuously rotates to release the second material layer for compounding.

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