Production method of composite current collector, electronic equipment thereof and storage medium
Through multiple downcompression and tension adjustment of the pressing roller device and the cathode roller, the complex and high cost of composite fluid production processes are solved, and high-quality and stable composite fluid production is achieved.
Patent Information
- Application Number
- CN202410787495.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-07-25
AI Technical Summary
The existing composite fluid production process is complex and has high cost, making it difficult to obtain high-quality composite fluid.
The method of combining the pressing roller device with the cathode roller is adopted, and the tight composite of the substrate and the foil layer is achieved by continuously pressing and pressing multiple times and combined with tension adjustment, and the production process is simplified.
It reduces production costs, improves the quality and stability of composite fluid collections, simplifies the process flow, and facilitates mass production.
Smart Images
Figure CN120376652A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of composite current collectors, and more specifically, to a production method of a composite current collector, an electronic device, and a storage medium thereof. Background Art
[0002] With the development of material preparation technology, more and more composite materials replace the original metal materials and play an important role in lithium-ion batteries. Among them, the progress of composite current collectors replacing traditional lithium-ion battery copper foil current collectors is particularly rapid. Currently, in common production methods of composite current collectors, magnetron sputtering and other methods are mostly used to attach a metal foil layer to a substrate, and electroplating with water and other methods are combined to obtain a composite current collector. The overall preparation process of this type of production process is complex and the production cost is high.
[0003] Therefore, there is an urgent need in the prior art for a production process of a composite current collector to simplify the production process, reduce the production cost, and overcome the deficiencies of the existing production process containing processes such as lamination, so as to obtain a composite current collector with good quality. Summary of the Invention
[0004] The present invention aims to overcome at least one of the above-mentioned deficiencies of the prior art, and provides a production method of a composite current collector, which has a low production cost, is convenient for mass production, and can improve the composite effect by combining a lamination process, so as to obtain a composite current collector with higher quality.
[0005] The technical solution adopted by the present invention is a production method of a composite current collector, including the following steps: A1. A unwinding device unwinds a substrate, and the side to be compounded of the substrate for compounding with a foil has adhesiveness; A2. A raw foil machine generates a foil layer on the surface of a cathode roller; A3. The substrate is transmitted so that the side to be compounded faces the surface of the cathode roller, and a pressing roller device presses down the substrate and abuts it on the cathode roller, and the side to be compounded of the substrate and the foil layer on the surface of the cathode roller are laminated to obtain a composite layer, and the composite layer is led out.
[0006] Further, steps A1 and A2 can be carried out simultaneously.
[0007] The pressure rollers in the pressure roller device are arranged circumferentially along the surface of the cathode roller. When the transmission substrate reaches the surface to be laminated facing the surface of the cathode roller, the pressure roller device presses down the substrate and holds it against the cathode roller to achieve the lamination and adhesion between the substrate and the foil layer. Further, the viscosity can be formed by the characteristics of the substrate itself or achieved by a glue layer coated on the surface of the substrate. For a relatively thin foil layer, the substrate layer with viscosity can peel the foil layer from the cathode roller immediately after lamination and then export it. Under the action of the pressure roller device, the substrate layer of the present application can be directly laminated in cooperation with the surface material of the cathode roller, which is applicable to the lamination of ultra-thin material foils, and realizes lamination on the premise of avoiding a long transmission path of the ultra-thin material, so as to obtain a high-quality composite current collector with tight lamination and a flat surface.
[0008] Further, in step A3, in the production direction, there is at least two consecutive downward press laminations against the cathode roller, for example, at least two consecutive and continuous stages of downward press laminations against the cathode roller, including the initial lamination and the final lamination, and the downward pressure F1 of the initial lamination > the downward pressure F2 of the final lamination.
[0009] When the substrate layer reaches the preliminary lamination roller for lamination with the foil material on the surface of the cathode roller, the preliminary lamination provides a strong lamination pressure, so as to tightly laminate the composite layer in the initial lamination state, keep the composite material in the lamination area fully stretched, and squeeze out the possible gaps or bubbles at the composite interface to the upstream input side, so as to ensure that the composite interface of the composite layer after preliminary lamination is completely adhered and basically free of obvious bubbles, gaps and other conditions, improving the lamination quality; while the final lamination 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, and avoid wrinkles caused by elastic contraction after passing through the lamination section; at the same time, avoid continuous accumulation to generate obvious air gaps, etc. Because the composite layer after preliminary lamination may still have very few air gaps that basically do not affect the performance of the composite layer microscopically. If the final lamination also maintains a strong lamination pressure, it may squeeze the air gaps upstream, that is, between the preliminary lamination and the final lamination. As the production process progresses, it will continuously accumulate to form obvious bubbles or wrinkles 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 export and separation of the composite layer. The reduction of the final lamination pressure compared with the upstream lamination pressure is beneficial to reducing the adhesion degree of the wound material on the corresponding cathode roller, facilitating the detachment of the foil material with the laminated substrate from the corresponding roller body along the transmission direction. If F2 is a strong lamination pressure, it is possible that as the material advances, the wound material is easy to stick to the corresponding cathode roller, and as the material is transmitted, it is easy to tear when exporting the composite layer due to uneven stress. The downward pressure includes the pressure when the corresponding pressure roller acts vertically on the surface of the holding roller body.
[0010] Further, in step A3, in the production direction, there are at least three consecutive downward pressings against the cathode roller, for example, at least three consecutive and continuous stages of downward pressings against the cathode roller, including the initial pressing, the transition pressing, and the finishing pressing, and the downward pressing force F1 in the initial pressing > the downward pressing force F2 in the finishing pressing; the downward pressing force F1 in the initial pressing > the downward pressing force F3 in the transition pressing. Further, F3≥F2. Furthermore, F1>F3>F2, and the downward pressing force decreases in the direction from the initial pressing to the finishing pressing, 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 0.1N / in to 10N / in (0.1N per inch to 10N per inch).
[0011] Further, the initial pressing, the transition pressing, and the finishing pressing are respectively realized by the downward pressing of the corresponding initial pressing roller, transition pressing roller, and finishing pressing roller; and the surface hardness H1 of the initial pressing roller > the surface hardness H2 of the finishing pressing roller; the surface hardness H1 of the initial pressing roller > the surface hardness H3 of the transition pressing 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. The surface hardness of the roller includes the rubber hardness on the surface of the roller body, which is the Shore A hardness; the acting areas corresponding to the surface hardnesses of different rollers are different, and by setting them as the aforementioned H1, H3, and H2, the compounding effect can be further significantly improved.
[0012] When the surface of the initial pressing roller in the initial pressing is relatively hard, in the initial stage of compounding, combined with a large pressing force, the downward pressing area is concentratedly stressed so as to be fully pressed while preventing air bubbles from entering. The finishing pressing assists in pressing to strengthen the bonding strength of the composite layer. The surface hardness of the finishing pressing roller in the finishing pressing is reduced. In addition to extending the pressing area of the composite layer during travel; more importantly, it can slowly release the composite layer, and then promote it to separate from the cathode roller and be led out. The transition pressing can at least also play the role of assisting the pressing of the finishing pressing roller. Preferably, its downward pressing force F3 is also less than F1. And as the intermediate transition pressing, it can increase the auxiliary pressing area and further improve the compounding effect. And H1>H3, H1>H2, H3≥H2, combined with the relationship between the corresponding downward pressing forces, so as to cooperate with the initial pressing and the finishing pressing rollers to achieve a progressive slowdown in pressing and release. Further, the diameter range of the pressing rollers in the pressing roller combination is 120 to 200 mm.
[0013] Furthermore, the substrate passes through a tension adjustment mechanism during the unwinding to compounding process; and further comprises step A4, obtaining in real time the surface tension of the substrate during the unwinding process in step A1 and / or the surface tension of the substrate during the pressing process of the pressure roller device, and maintaining the surface tension during the compounding process of the substrate and the foil layer by at least controlling the unwinding speed, the winding speed, correcting the unwinding deviation and / or adjusting the tension through the tension adjustment mechanism. Furthermore, during steps A1 to A3, the substrate tension is maintained in a range of 1 to 100N.
[0014] Further, the surface to be composited of the substrate is covered with a release layer. In step A1, the release layer is peeled off while unwinding, so that the surface to be composited is exposed, and the unwinding tension is maintained. Further, the peeling release layer is located upstream of the tension adjustment mechanism; the tension of the unwinding substrate is monitored in real time during the peeling process. Further, in the unwinding direction, a guide roller, a tension adjustment roller and a tension detection roller are arranged in sequence, wherein the tension adjustment roller is the aforementioned tension adjustment mechanism, and the peeling component is arranged between the tension adjustment roller and the guide roller. When there is an adhesive layer on the surface of the film roll, in order to facilitate winding and storage, a release film is usually required to separate the adhesive layer of the outer ring film roll and the film layer of the film roll in the inner ring; and in order to facilitate direct composite after unwinding, it is necessary to peel off the release film in advance. During the peeling process of the release film, it will generate a certain degree of interference force; and setting the peeling component before the tension adjustment structure is conducive to immediate adjustment according to the tension change caused by the peeling process, so as to ensure smooth and flat unwinding while peeling. The peeling component especially needs to be arranged before the tension adjustment mechanism so that the required tension can be adjusted back to the tension adjustment roller in time.
[0015] Furthermore, performing steps A1 to A3 once to obtain a composite layer of a primary composite, further comprising a secondary composite, taking the surface of the other side of the substrate that is sticky and not composited with foil as the surface to be composited, repeating steps A1 to A3 to obtain a composite current collector with composite foil layers on both sides of the substrate.
[0016] Furthermore, the surface to be composited of the substrate for the first composite is not covered with a release layer, and the surface to be composited of the substrate for the second composite is covered with a release layer. Furthermore, the unwinding device has a plurality of driving rollers, and the surface to be composited is in contact with the surface of at most one roller. When one side of the surface to be composited has a non-completely solid material layer such as an adhesive layer, it is in contact with the surface of at most one roller, which is beneficial to ensure the integrity of its surface material, etc., and improve the quality of subsequent composite product. Further, the substrate initially used for composite includes a film layer and an adhesive layer, and the adhesive layer is arranged on the surface of the film layer; the surface to be composited has an exposed adhesive surface. Furthermore, during the unwinding process, the side of the film roll used for composite with the foil material only passes through one roller surface at most, which can avoid contact with the roller surface as much as possible, thereby reducing the loss of the surface material before composite and ensuring a certain degree of flatness; so that in the subsequent specific composite, the downstream material can be bonded flat, and bubbles and gaps between the bonding interfaces can be reduced, so as to significantly improve the quality of the composite product.
[0017] Further, the surface of the substrate has an adhesive layer, and the surface to be laminated is the exposed surface of the adhesive layer.
[0018] Further, after obtaining the composite layer, a post-treatment step is further included. The post-treatment step includes: passivating the surface of the composite layer; and / or, extruding the residual passivating liquid on the surface of the composite layer; and / or, cleaning the surface of the foil layer of the composite layer; and / or, hot air drying and / or drying the composite layer.
[0019] Further, the passivation treatment includes immersing the composite layer surface with a passivating liquid; the passivating liquid uses a chromium-free passivating liquid. During the drying process, the drying temperature range is 60-90°C.
[0020] Further, in step A1, the adhesiveness of the surface to be laminated is achieved through the adhesive layer. Before step A1, a substrate pretreatment is further included, including the steps of: A01, coating an adhesive solution on the surface of the substrate to form an adhesive layer; A02, pre-curing the adhesive layer; A03, covering a release film on the adhesive layer, and winding the finished product for standby; or, covering a release film on the adhesive layer on the current substrate side, flipping the substrate, and repeating steps A01-A02 on the other side of the substrate so that both sides of the substrate have an adhesive layer, and winding the finished product for standby.
[0021] Another object of the present invention is to provide an electronic device, including: At least one processor, and A memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the production method as described above.
[0022] Another object of the present invention is to provide a computer-readable storage medium storing a computer program, and the computer program is executed by a processor to implement the production method as described above.
[0023] Another object of the present invention is to provide a composite current collector produced by the production method as described above. Based on the production method of the present application, it is easy to obtain a high-quality composite current collector, the substrate layer and the foil layer are tightly laminated, and the surface is flat; it can provide excellent electrical conductivity and stability.
[0024] Compared with the prior art, the beneficial effects of the present application are as follows: In the production method of the composite current collector described in the present application, the composite process of the substrate layer and the foil layer is simple, which can significantly reduce the production cost, facilitate mass production, and at the same time ensure the quality of the composite current collector. Through the cooperation of the integrated pressing roller device and the cathode roller, the composite process can be completed without driving the foil material on the surface of the cathode roller; with the cooperation of tension adjustment and the control of the pressing process, it is convenient to obtain a composite current collector with a flat and tightly adhered composite interface and basically no bubbles or gaps at the composite interface, and a composite current collector with higher quality can be obtained. While simplifying the process, the performance and stability of the produced composite current collector are ensured. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a partial schematic diagram of the system corresponding to the production method of the present application.
[0026] Figure 2 It is a schematic diagram (I) of the structure of the pressing roller device of the present application.
[0027] Figure 3 It is a schematic diagram (II) of the structure of the pressing roller device of the present application.
[0028] Figure 4 It is a schematic diagram of the cooperation structure of the preliminary pressing roller, the transition pressing roller, the finishing pressing roller and the cathode roller of the present application.
[0029] Figure 5 It is a schematic diagram of the structure of the unwinding device of the present application.
[0030] Figure 6 It is a schematic diagram of the system structure of the composite current collector production method applying the present application.
[0031] BRIEF DESCRIPTION OF THE DRAWINGS: Unwinding device 1100, tension adjusting roller 1130, tension detecting roller 1140, guiding roller 1150, peeling device 1200, composite system 3000, pressing roller device 3100, guiding roller 3101, height adjusting mechanism 3102, guiding-away roller 3103, pressing roller combination 3120, pressing roller 31211, telescopic mechanism 31212, preliminary pressing roller 3121A, finishing pressing roller 3121B, transition pressing roller 3121C, raw foil machine 4000, cathode roller 4100, substrate layer 5100, foil layer 5200, composite layer 5300, passivation tank 6100, extrusion roller 6200, spray chamber 6300, hot air device 6400, drying chamber 6500. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0032] The drawings of the present invention are only for illustrative purposes and should not be construed as a limitation to the present invention. For better illustrating the following embodiments, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.
[0033] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered 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 normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially. Example 1
[0034] This embodiment discloses a method for producing a composite current collector, comprising the following steps: A1, an unwinding device 1100 unwinds a substrate, wherein the substrate has a sticky surface to be laminated with the foil material; A2, a foil production machine 4000 generates a foil layer 5200 on the surface of a cathode roller 4100; A3, the substrate layer 5100 is driven to face the surface of the cathode roller 4100 with the surface to be laminated, the pressing roller device presses the substrate layer 5100 downward and holds it against the cathode roller 4100, and the surface to be laminated of the substrate and the foil layer 5200 on the surface of the cathode roller 4100 are pressed together to obtain a composite layer 5300, and the composite layer 5300 is led out; Figure 1 shown.
[0035] Among them, steps A1 and A2 can be performed simultaneously.
[0036] The unwinding device 1100 has a plurality of driving rollers, and the surface to be composited is in contact with the surface of at most one roller. When one side of the surface to be composited has a non-completely solid material layer such as an adhesive layer, it is in contact with at most one roller surface, which is beneficial to ensure the integrity of its surface material, etc., and improve the quality of the subsequent composite material products. Further, the substrate initially used for composite includes a film layer and an adhesive layer, and the adhesive layer is arranged on the surface of the film layer; the side of the surface to be composited has an exposed adhesive surface. Furthermore, during the unwinding process, the side of the substrate used for composite with the foil material only passes through one roller surface at most, which can avoid contact with the roller surface as much as possible, thereby reducing the loss of the surface material before composite and ensuring a certain degree of flatness; so that in the subsequent specific composite, the downstream material can be bonded flat, reducing bubbles and gaps between the bonding interfaces, etc., to significantly improve the quality of the composite material products. In this embodiment, the surface of the substrate has an adhesive layer, and the surface to be composited is the exposed surface of the adhesive layer.
[0037] like Figures 2 - 4As shown, the pressing rollers 31211 in the pressing roller device 3100 in the composite system 3000 are arranged circumferentially along the surface of the cathode roller 4100. When the driving substrate is conveyed to the surface of the cathode roller 4100 with the surface to be compounded facing it, the pressing roller device presses down the substrate and holds it against the cathode roller 4100 to achieve the bonding and adhesion between the substrate and the foil layer 5200. The viscosity can be formed by the characteristics of the substrate itself or achieved by a glue layer coated on the surface of the substrate. For the relatively thin foil layer 5200, the substrate layer 5100 with viscosity can peel the foil layer 5200 from the cathode roller 4100 along with the driving after pressing, and then export it. Under the action of the pressing roller device, the substrate layer 5100 in this application can be directly pressed in cooperation with the surface material of the cathode roller 4100, which is suitable for the compounding of ultra-thin material foils. The compounding is achieved on the premise of avoiding a long transmission path of the ultra-thin material, so as to obtain a high-quality composite current collector with tight compounding and a flat surface.
[0038] In step A3 of this embodiment, in the production direction, there are at least two consecutive downward pressings against the surface of the cathode roller 4100, including the initial pressing and the final pressing. The initial pressing is the pressing closest to the upstream side, and the final pressing is the pressing closest to the downstream side; and the downward pressing force F1 of the initial pressing > the downward pressing force F2 of the final pressing. When the substrate layer 5100 reaches the preliminary pressing roller 3121A for compounding with the foil material on the surface of the cathode roller 4100, the preliminary pressing provides a strong pressing force, so as to tightly press the composite layer 5300 in the initial bonding state, and keep the composite material in the pressing area fully stretched, and squeeze out the possible gaps or bubbles at the composite interface to the upstream input side, so as to ensure that the composite interface of the composite layer 5300 after preliminary pressing is completely bonded and basically free of obvious bubbles, gaps and other conditions, improving the compounding quality; while the final pressing provides a pressing force 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 5300, and avoid the wrinkles caused by elastic contraction after passing through the pressing section; setting F2 < F1 is also beneficial to the export and separation of the composite layer 5300. The reduction of the final pressing pressure compared with the upstream pressing pressure is beneficial to reducing the bonding degree of the wound material on the corresponding cathode roller 4100, and facilitating the separation of the foil material with the substrate compounded on it from the corresponding roller body along the driving direction.
[0039] To further improve the lamination effect, in step A3, in the production direction, after entering the lamination area through the guiding roller 3101, there are at least three consecutive downward pressings against the surface of the cathode roller 4100, including the initial pressing, the transitional pressing, and the final pressing; the guiding roller 3101 is provided with a height adjustment mechanism 3102 to facilitate the adjustment of the entry angle, etc.; the initial pressing is the pressing at the confluence of the base material and the foil layer 5200; the final pressing is the last pressing during the lamination process, that is, the pressing closest to the downstream; the transitional pressing is one or more pressings between the initial pressing and the final pressing. And the downward pressing force F1 of the initial pressing > the downward pressing force F2 of the final pressing; the downward pressing force F1 of the initial pressing > the downward pressing force F3 of the transitional pressing. Further, F3≥F2. More specifically, F1>F3>F2, and the downward pressing force decreases in the direction from the initial pressing to the final pressing, and the decreasing ratio ranges from 3% to 20%; that is, F1×3%<F1-F3<F1×20%, F3×3%<F3-F2<F3×20%. More specifically, 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 to 10N / in (0.1N per inch to 10N per inch). And the initial pressing, the transitional pressing, and the final pressing are respectively achieved by the downward pressing of the corresponding initial pressing roller, transitional pressing roller, and final pressing roller; and the surface hardness H1 of the initial pressing roller > the surface hardness H2 of the final pressing roller; the surface hardness H1 of the initial pressing roller > the surface hardness H3 of the transitional pressing roller. Further, H3≥H2; further, H1≥45 degrees; more specifically, 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.
[0040] In this embodiment, the initial pressing, the transitional pressing, and the final pressing are achieved by the pressing rollers 31211 corresponding to and connected to the telescopic mechanism 31212, corresponding to the initial pressing roller 3121A, the transitional pressing roller 3121C, and the final pressing roller 3121B, to form a pressing roller combination 3120.
[0041] When the surface of the initial lamination roller 3121A for initial lamination is relatively hard, at the initial stage of lamination, with a relatively large lamination pressure, the force is concentrated in the downward pressure area to fully laminate while preventing air bubbles from entering. The auxiliary lamination of the final lamination strengthens the bonding strength of the composite layer 5300. The surface hardness of the final lamination roller 3121B for final lamination is reduced. In addition to extending the lamination area of the composite layer 5300 during travel; more importantly, it can slowly release the composite layer 5300, thereby promoting the separation from the cathode roller 4100 and being deflected by the deflection roller 3103. The transition lamination can at least play an auxiliary lamination role for the final lamination. Preferably, its downward pressure F3 is also less than F1. As an intermediate transition lamination, it can increase the auxiliary lamination area and further improve the lamination effect. And H1 > H3, H1 > H2, H3 ≥ H2. Combining the relationship between the corresponding downward pressures, the transition lamination cooperates with the initial lamination and the final lamination to achieve a progressive slowdown in lamination and release. Further, the diameter range of the roller 31211 in the roller combination 3120 is 120 - 200 mm.
[0042] In this embodiment, the substrate passes through a tension adjustment mechanism during the process from unwinding to lamination; it also includes step A4, which is to obtain in real time the surface tension of the substrate during the unwinding process in step A1 and / or the surface tension of the substrate during the downward pressure process of the roller device, and at least maintain the surface tension during the lamination process of the substrate and the foil layer 5200 by controlling the unwinding speed, the winding speed, correcting the unwinding offset, and / or adjusting the tension through the tension adjustment mechanism. Further, during steps A1 - A3, the substrate tension is maintained in the range of 1 - 100 N.
[0043] Since the surface to be laminated is sticky and is stored in a wound state before unwinding, it is necessary to cover it with a release layer for separation; and after unwinding, it needs to be peeled off before lamination. That is, in this embodiment, the surface to be laminated of the substrate is covered with a release layer. In step A1, the release layer is peeled off while unwinding, so that the surface to be laminated is exposed, and the unwinding tension is maintained. The process of peeling off the release layer is located upstream of the tension adjustment mechanism; the unwinding substrate tension is monitored in real time during the peeling process. As Figure 5 shown, specifically, the tension adjustment mechanism is the tension adjustment roller 1130 in the unwinding device 1100; the unwinding device 1100 is arranged in sequence in the unwinding direction as the guide roller 1150, the tension adjustment roller 1130, and the tension detection roller 1140. Among them, the tension adjustment roller 1130 is the aforementioned tension adjustment mechanism. In the roller travel direction, the peeling component 1200 is arranged between the tension adjustment roller 1130 and the guide roller 1150 or is arranged between the guide roller 1150 and the substrate.
[0044] In this embodiment, after obtaining the composite layer 5300, a post-treatment step is further included. The post-treatment step includes: passivating the surface of the composite layer 5300; and / or, extruding the passivation liquid remaining on the surface of the composite layer 5300; and / or, cleaning the surface of the foil layer 5200 of the composite layer 5300; and / or, hot air drying and / or oven drying the composite layer 5300. The passivation treatment includes immersing the composite layer 5300 surface with a passivation liquid; the passivation liquid uses a chromium-free passivation liquid. During the oven drying process, the drying temperature range is 60~90 °C. Among them, passivation, extrusion of the remaining passivation liquid, spray cleaning, hot air drying, and oven drying can be realized through the corresponding passivation tank 6100, extrusion roller 6200, spray chamber 6300, hot air device 6400, and drying chamber 6500, as Figure 6 shown.
[0045] Executing steps A1~A3 and their post-treatment steps once can obtain a once-compounded composite layer 5300. This embodiment further includes secondary compounding. The surface of the substrate on the other side that has adhesiveness and has not been compounded with the foil is used as the surface to be compounded. Repeat steps A1~A3 and their post-treatment steps to obtain a composite current collector with foil layers 5200 compounded on both sides of the substrate layer 5100. Optionally, the surface to be compounded for the first compounding of the substrate is not covered with a release layer, and the surface to be compounded for the second compounding of the substrate is covered with a release layer. This method can also unwind the roll normally after winding.
[0046] In addition, when the adhesiveness of the surface to be compounded is achieved through an adhesive layer in step A1 of this embodiment, a substrate pretreatment is further included before step A1, including the steps: A01, coating an adhesive liquid on the surface of the substrate to form an adhesive layer; A02, pre-curing the adhesive layer; A03, covering a release film on the adhesive layer and winding the finished product for standby; or, covering a release film on the adhesive layer on the current substrate side, flipping the substrate, and repeating steps A01~A02 on the other side of the substrate so that both sides of the substrate have an adhesive layer, and winding the finished product for standby. Embodiment 2
[0047] This embodiment discloses an electronic device, including: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the production method as described in the foregoing Embodiment 1.
[0048] The electronic device can be a control device of the corresponding system of the production method. Embodiment 3
[0049] This embodiment discloses a computer-readable storage medium storing a computer program, and the computer program is executed by a processor to implement the production method described in the foregoing Embodiment 1. Embodiment 4
[0050] This embodiment discloses a composite current collector produced by the production method described in the foregoing Embodiment 1. The composite current collector may be a five-layer structure obtained by two composites, that is, adhesive layers and foil layers 5200 are symmetrically arranged on both sides of the film layer, and the adhesive layers are located between the foil layers 5200 and the film layer. Based on the production method of this application, the substrate layer 5100 and the foil layer 5200 are tightly combined and the surface is flat; excellent electrical conductivity and stability can be provided.
[0051] 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, improvements, etc. made within the spirit and principle of the claims of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. A production method of a composite current collector, characterized in that, It includes the following steps: A1. The unwinding device unwinds the base material, and the side to be laminated of the base material for laminating with the foil has adhesiveness. A2. The copper foil generator generates a foil layer on the surface of the cathode roller. A3. The base material is conveyed to make the side to be laminated face the surface of the cathode roller. The pressing roller device presses down the base material and abuts it against the cathode roller. The side to be laminated of the base material and the foil layer on the surface of the cathode roller are pressed together to obtain a composite layer, and the composite layer is led out.
2. The production method according to claim 1, characterized in that, In step A3, in the production direction, there are at least two times of downward pressing and laminating against the cathode roller, including the initial pressing and the final pressing, and the downward pressing force F1 of the initial pressing > the downward pressing force F2 of the final pressing.
3. The production method according to claim 1, characterized in that, In step A3, in the production direction, there are at least three times of downward pressing and laminating against the cathode roller, including the initial pressing, the transition pressing and the final pressing, and the downward pressing force F1 of the initial pressing > the downward pressing force F2 of the final pressing; the downward pressing force F1 of the initial pressing > the downward pressing force F3 of the transition pressing; and / or, the downward pressing force F1 of the initial pressing > the downward pressing force F3 of the transition pressing > the downward pressing force F2 of the final pressing, and the downward pressing forces of the initial pressing, the transition pressing and the final pressing decrease in sequence, and the decreasing ratio range is 3% - 20%.
4. The production method according to claim 3, characterized in that, The initial pressing, the transition pressing and the final pressing are respectively realized by downward pressing of the corresponding initial pressing roller, transition pressing roller and final pressing roller; and the surface hardness H1 of the initial pressing roller > the surface hardness H2 of the final pressing roller; the surface hardness H1 of the initial pressing roller > the surface hardness H3 of the transition pressing roller; and / or, the surface hardness H1 of the initial pressing roller > the surface hardness H3 of the transition pressing roller > the surface hardness H2 of the final pressing roller.
5. The production method according to claim 1, characterized in that, The side to be laminated of the base material is coated with a release layer. In step A1, the release layer is peeled off while unwinding, so that the side to be laminated is exposed, and the unwinding tension is maintained.
6. The production method according to any one of claims 1 to 5, characterized in that, Performing steps A1 - A3 once obtains a once - laminated composite layer. It further includes secondary lamination. The surface of the base material on the other side that has adhesiveness and has not been laminated with the foil is used as the side to be laminated, and steps A1 - A3 are repeated to obtain a composite current collector with foil layers laminated on both sides of the base material.
7. The production method according to any one of claims 1 to 5, characterized in that, After obtaining the composite layer, it further includes a post - treatment step. The post - treatment step includes: performing passivation treatment on the surface of the composite layer; and / or, extruding the residual passivation liquid on the surface of the composite layer; and / or, cleaning the surface of the foil layer of the composite layer; and / or, performing hot - air drying and / or oven drying on the composite layer.
8. An electronic device, characterized in that, It includes: At least one processor, and A memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the production method according to any one of claims 1 - 7.
9. A computer-readable storage medium storing a computer program, characterized in that, The computer program is executed by the processor to implement the production method according to any one of claims 1 - 7.
10. A composite current collector produced by the production method according to any one of claims 1 - 7.