Stripping device, current collector manufacturing equipment and battery production system

Abstract

The utility model relates to a stripping device, current collector manufacturing equipment and a battery production system. The stripping device comprises a first unwinding mechanism used for unwinding a material strip, and the material strip comprises a base foil and a current collector layer arranged on the surface of at least one side of the base foil; the first winding mechanism is used for winding the base foil; and the stripping mechanism is used for guiding the material belt to move to the first winding mechanism along a first preset direction and can strip the current collector layer on the material belt passing through the stripping mechanism. According to the stripping device, the thin current collector layer can be directly obtained, the thin current collector layer can be directly used as a multi-layer current collector structure for preparing a battery after being cut, and the problem that the whole prepared multi-layer structure current collector is too thick due to the fact that a traditional crude foil machine is limited by the thickness of a base foil is solved; and the capacity density of the battery is effectively improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a stripping device, current collector fabrication equipment, and battery production system. Background Technology

[0002] Current collectors are one of the indispensable electrode materials in lithium-ion batteries. They have the important functions of carrying active materials and collecting micro-currents. The main function of current collectors is to gather the current generated by the active materials of the battery so as to form a larger current for external output.

[0003] In related technologies, current collectors typically use copper foil as the base foil, and then plate other metal layers on the base foil. In traditional current collector manufacturing processes, the base foil is usually processed on a foil-making machine. Due to the limitations of the foil-making machine's manufacturing process, if the base foil is too thin, it is prone to tape breakage. Therefore, the finished base foil is too thick, resulting in current collectors with two or more layers being generally thick. Utility Model Content

[0004] This application aims to address the problem that existing foil-making machines, limited by the thickness of the substrate foil, result in excessively thick multilayer current collectors, hindering the improvement of battery energy density. To this end, this application provides a stripping device, current collector fabrication equipment, and a battery production system.

[0005] In a first aspect, this application provides a stripping device, comprising:

[0006] A first unwinding mechanism is used to unwind a strip of material, the strip comprising a base foil and a current collector layer disposed on at least one surface of the base foil;

[0007] A first winding mechanism is used to wind up the base foil;

[0008] The peeling mechanism is used to guide the material strip along a first preset direction to the first winding mechanism, and is capable of peeling the current collector layer on the material strip that passes through it.

[0009] The stripping device according to the first aspect of this application has at least the following beneficial effects:

[0010] The stripping device of this application, through the coordinated arrangement of a first unwinding mechanism, a stripping mechanism, and a first winding mechanism, strips the current collector layer on the material strip as it is unwound from the first unwinding mechanism along a first preset direction to the first winding mechanism. Since the thinner current collector layer can be pre-plated onto the surface of the base foil on the material strip, and the base foil serves as a temporary substrate for the current collector layer, it does not constitute the structure of the current collector layer. Therefore, the current collector layer stripped by the stripping mechanism is not limited by the thickness of the base foil. Thus, after stripping the current collector layer from the material strip during the conveyor belt process, the stripping mechanism can directly obtain a thinner current collector layer. This thinner current collector layer, after being cut, can be directly used as a multi-layer current collector structure for battery fabrication, overcoming the problem of excessively thick multi-layer current collector structures caused by the thickness limitation of the base foil in traditional foil-making machines, effectively improving the energy density of the battery.

[0011] In some embodiments, the substrate foil includes a first surface and a second surface opposite to each other along its own thickness direction, and both the first surface and the second surface are provided with a current collector layer;

[0012] The peeling mechanism includes a first peeling unit and a second peeling unit, which are sequentially disposed on the conveyor path of the conveyor belt to peel off the current collector layer on the first surface and the second surface, respectively.

[0013] With this setup, during the conveyor belt process, the current collector layers on the two opposite surfaces of the substrate foil are peeled off one after the other to obtain two current collector layers. After being cut, both current collector layers can be used as current collectors for the multilayer structure of the battery, which helps to improve the production efficiency of the battery.

[0014] In some embodiments, a plurality of current collector layers are stacked on both the first surface and the second surface;

[0015] Both the first stripping unit and the second stripping unit are multiple. The multiple first stripping units are used to strip the multiple current collector layers on the first surface one by one, and the multiple second stripping units are used to strip the multiple current collector layers on the second surface one by one.

[0016] With this setup, during the conveyor belt process, multiple current collector layers on two opposing surfaces of the substrate foil are peeled off to obtain more than two current collector layers. All the peeled current collector layers can be used as current collectors for the multilayer structure of the battery after being cut, which helps to improve the production efficiency of the battery.

[0017] In some embodiments, all of the first stripping units and all of the second stripping units are alternately arranged along the conveyor belt path.

[0018] This configuration allows the two current collector layers, which are symmetrical on opposite surfaces of the substrate foil, to be peeled off sequentially. This reduces the probability of the substrate foil breaking during the conveyor belt process due to uneven stress on the two opposite surfaces. Furthermore, it enables more accurate classification and collection of the current collector layers on opposite surfaces of the substrate foil.

[0019] In some embodiments, the first stripping unit includes a first guide roller, a first stripping roller, and a first recovery roller, wherein a first roller gap is formed between the first guide roller and the first stripping roller for the material strip to pass through;

[0020] The first stripping roller is used to strip the current collector layer on the first surface and convey it to the first recovery roller, the first recovery roller is used to wind up the current collector layer, and the first guide roller is used to convey the material strip to the second stripping unit.

[0021] With this configuration, the current collector layer on the first surface of the substrate foil of the strip is accurately peeled off by means of the mutual and opposite rotation of the first guide roller and the first peeling roller. The first recycling roller then recycles the peeled current collector layer, thereby obtaining a thinner current collector layer.

[0022] In some embodiments, the surface linear velocity of the first guide roller is configured to be equal to and opposite in direction to the surface linear velocity of the first stripping roller.

[0023] This configuration ensures that the peeling length of the current collector layer on the first surface of the substrate foil by the first peeling roller is the same as the conveying length of the conveying belt by the first guide roller. This allows the current collector layer on the first surface of the substrate foil to be completely peeled off by the first peeling roller, and also reduces the probability of wrinkling of the current collector layer and the remaining material during the peeling process by the first peeling roller, thereby improving the stability of the peeling of the current collector layer on the first surface of the substrate foil by the first peeling roller.

[0024] In some embodiments, the radius of the first guide roller is larger than the radius of the first stripping roller.

[0025] This configuration increases the contact area between the material strip and the first guide roller, improves the surface tension of the material strip during its journey along the first preset direction, and allows the first peeling roller to peel the current collector layer from the corresponding surface of the base foil more smoothly. In addition, it enables the material strip to be conveyed more stably along the first preset direction.

[0026] In some embodiments, the second stripping unit includes a second guide roller, a second stripping roller, and a second recovery roller, wherein a second roller gap is formed between the second guide roller and the second stripping roller for the material strip to pass through;

[0027] The second peeling roller is used to peel the current collector layer on the second surface and convey it to the second recovery roller, the second recovery roller is used to wind up the current collector layer, and the second guide roller is used to convey the substrate foil to which the current collector layer has been peeled to the first winding mechanism.

[0028] With this configuration, the current collector layer on the second surface of the base foil of the strip is accurately peeled off by means of the mutual and opposite rotation of the second guide roller and the second peeling roller. The second recovery roller then winds up and recovers the peeled current collector layer, thereby obtaining a thinner current collector layer.

[0029] In some embodiments, the surface linear velocity of the second guide roller is configured to be equal to and opposite in direction to the surface linear velocity of the second stripping roller.

[0030] This configuration ensures that the peeling length of the current collector layer on the second surface of the substrate foil by the second peeling roller is the same as the conveying length of the conveyor belt by the second guide roller. This allows the current collector layer on the second surface of the substrate foil to be completely peeled off by the second peeling roller, and also reduces the probability of wrinkling of the current collector layer and the remaining substrate foil during the peeling process by the second peeling roller, thereby improving the stability of the peeling of the current collector layer on the second surface of the substrate foil by the second peeling roller.

[0031] In some embodiments, the radius of the second guide roller is larger than the radius of the second stripping roller.

[0032] This configuration increases the contact area between the material strip and the second guide roller, improves the surface tension of the material strip during its journey along the first preset direction, and allows the second peeling roller to peel the current collector layer more smoothly from the corresponding surface of the base foil. Furthermore, it enables the material strip to be conveyed more stably along the first preset direction.

[0033] Secondly, this application provides a current collector manufacturing device, which includes the stripping device described above.

[0034] The current collector fabrication apparatus according to the second aspect of this application has at least the following beneficial effects:

[0035] The current collector fabrication equipment of this application, due to the aforementioned stripping device, also has the same technical effect brought by the stripping device, that is, it can directly obtain a thin current collector layer. After being cut, the thin current collector layer can be directly used as a multi-layer current collector structure for battery fabrication, overcoming the problem that the multi-layer current collector structure prepared by traditional foil making machines is too thick due to the thickness limitation of the substrate foil, and effectively improving the energy density of the battery.

[0036] In some embodiments, the current collector fabrication apparatus further includes:

[0037] The second unwinding mechanism is used to unwind the base foil so that the base foil travels along a second preset direction.

[0038] An electroplating assembly includes multiple electroplating tanks, all of which are arranged in series along the conveyor path of the substrate foil to sequentially plate a metal layer on the surface of the substrate foil, so that a current collector layer is formed on at least one side surface of the substrate foil.

[0039] The second winding mechanism is used to wind up the substrate foil on which the current collector layer is formed.

[0040] In this configuration, metal layers of appropriate thickness are plated onto the surface of the substrate foil through various electroplating tanks of the electroplating assembly, forming a relatively thin current collector layer. The stacked current collector layers and the substrate foil together constitute a strip for subsequent peeling of the current collector layer by the stripping device. The substrate foil serves as a temporary substrate for the current collector layer and does not constitute the structure of the current collector layer, thus allowing the subsequent stripping device to peel the current collector layer from the substrate foil without being limited by the thickness of the substrate foil.

[0041] In this way, after the stripping mechanism peels off the current collector layer on the conveyor belt during the conveyor belt process, a thinner current collector layer can be directly obtained. This thinner current collector layer can be directly used as the multi-layer current collector structure for battery preparation after being cut. This overcomes the problem that the multi-layer current collector structure prepared by the traditional foil making machine is too thick due to the thickness limitation of the substrate foil, and effectively improves the energy density of the battery.

[0042] Thirdly, this application provides a battery production system, which includes the current collector fabrication equipment described above.

[0043] The battery production system according to the third aspect of this application has at least the following beneficial effects:

[0044] The battery production system of this application, being equipped with the aforementioned current collector fabrication equipment, also possesses the same technical effect brought by the current collector fabrication equipment, namely, it can directly obtain a thin current collector layer. This thin current collector layer, after being cut, can be directly used as a multi-layer current collector structure for battery fabrication, overcoming the problem that the multi-layer current collector structure produced by traditional foil-making machines is too thick due to the limitation of the thickness of the substrate foil, and effectively improving the energy density of the battery.

[0045] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0046] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0047] Figure 1 This is a schematic diagram of the stripping device according to an embodiment of this application.

[0048] Figure 2 This is an exploded view of the material strip structure according to an embodiment of this application.

[0049] Figure 3 This is a partial structural schematic diagram of the current collector fabrication device according to an embodiment of this application.

[0050] Explanation of reference numerals in the attached drawings: First unwinding mechanism 100; First winding mechanism 200; Peeling mechanism 300; First peeling unit 310; First guide roller 311; First peeling roller 312; First recovery roller 313; First roller gap 314; Second peeling unit 320; Second guide roller 321; Second peeling roller 322; Second recovery roller 323; Second roller gap 324; Tension roller 330; Second unwinding mechanism 400; Third guide roller 410; Electroplating assembly 500; Electroplating tank 510; Second winding mechanism 600; Strip 700; Base foil 710; First surface 711; Second surface 712; Current collector layer 720; Metal layer 721; First preset direction S1; Second preset direction S2. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0057] Current collectors are one of the indispensable electrode materials in lithium-ion batteries. They have the important functions of carrying active materials and collecting micro-currents. The main function of current collectors is to gather the current generated by the active materials of the battery so as to form a larger current for external output.

[0058] Currently, the preparation of multi-layer current collectors in batteries typically involves first producing a base foil on a foil-making machine, and then electroplating other functional coatings onto the surface of the base foil to obtain a multi-layer current collector.

[0059] In the fabrication process of the aforementioned multilayer current collector, to reduce the risk of tape breakage during the tape feeding process, the foil production machine typically needs to prepare a substrate foil with a thickness greater than or equal to 4 μm (micrometers) to ensure that the substrate foil has good structural strength, ductility, and brittleness. If other functional coatings are electroplated on the surface of the substrate foil of this thickness to obtain a multilayer current collector, and the number of functional coatings is required to be at least two, with one special functional coating having a thickness greater than 2 μm among all functional coatings, then the thickness of the final multilayer current collector will generally be greater than or equal to 7 μm. This results in an excessively thick multilayer current collector, making it difficult to improve the overall energy density of the battery.

[0060] To address the problem that current foil-making machines, limited by the thickness of the substrate foil, result in excessively thick multilayer current collectors, hindering the improvement of battery energy density, one or more embodiments of this application provide a peeling device. The peeling device includes a first unwinding mechanism 100, a first winding mechanism 200, and a peeling mechanism 300. The first unwinding mechanism 100 unwinds a strip 700, which includes a substrate foil 710 and a current collector layer 720 deposited on at least one surface of the substrate foil 710. The first winding mechanism 200 winds up the substrate foil 710. The peeling mechanism 300 guides the strip 700 along a first preset direction S1 to the first winding mechanism 200 and peels off the current collector layer 720 from the strip 700 as it passes through.

[0061] The peeling device in this embodiment is configured with the cooperation of a first unwinding mechanism 100, a peeling mechanism 300, and a first winding mechanism 200. During the process of the peeling mechanism 300 guiding the strip 700 unwound from the first unwinding mechanism 100 to the first winding mechanism 200 along the first preset direction S1, the current collector layer 720 on the strip 700 is peeled off. Since the relatively thin current collector layer 720 can be pre-plated onto the surface of the base foil 710 on the strip 700, the base foil 710 serves as a temporary substrate for the current collector layer 720 and does not constitute the structure of the current collector layer 720. The current collector layer 720 peeled off by the peeling mechanism 300 is not limited by the thickness of the base foil 710. Therefore, after the stripping mechanism 300 strips the current collector layer 720 on the material belt 700 during the conveying process, it can directly obtain a thinner current collector layer 720. This thinner current collector layer 720 can be directly used as a multi-layer current collector structure for battery preparation after being cut. In this way, the problem of excessively thick overall multi-layer current collector structure caused by the thickness limitation of the substrate foil in traditional foil making machines is overcome, and the energy density of the battery is effectively improved.

[0062] See Figure 1 and Figure 2 This application provides a peeling device, which includes a first unwinding mechanism 100, a first winding mechanism 200, and a peeling mechanism 300.

[0063] The first unwinding mechanism 100 is used to unwind the strip 700, which includes a base foil 710 and a current collector layer 720 disposed on at least one side surface of the base foil 710.

[0064] The first winding mechanism 200 is used to wind up the base foil 710. The peeling mechanism 300 is used to guide the strip 700 along the first preset direction S1 to the first winding mechanism 200, and can peel off the current collector layer 720 on the strip 700 that passes through it.

[0065] It should be noted that in the strip 700 of this application, the substrate foil 710 refers to the metal foil layer used to support the current collector layer 720. The substrate foil 710 can be, but is not limited to, stainless steel foil, titanium foil, or other metal foils. The thickness of the substrate foil 710 is set to a range of 4μm-20μm, specifically, a range of 5μm-15μm, preferably 10μm. It is easy to understand that the substrate foil 710 only serves as a temporary substrate and does not constitute the structure of the current collector layer 720. It does not affect the thickness of the current collector layer 720. Therefore, the substrate foil 710 can be made of a thicker material to improve structural strength.

[0066] The current collector layer 720 refers to a current collector formed by stacking multiple metal layers; that is, the current collector layer 720 includes multiple stacked metal layers. It can be understood that depositing multiple sequentially stacked metal layers on one surface of the substrate foil 710 forms the current collector layer 720. The specific method of depositing the metal layers on the substrate foil 710 is not limited; traditional methods such as roller plating lines, double-sided plating lines, vapor deposition equipment, and magnetron sputtering can all be used to process the various metal layers.

[0067] It should be noted that in the strip 700 of this application, at least one surface of the substrate foil 710 may be provided with multiple current collector layers 720. For example, one surface of the substrate foil 710 may have one current collector layer 720, and the opposite surface may have multiple current collector layers 720. Alternatively, one surface of the substrate foil 710 may have multiple current collector layers 720, and the opposite surface may also have multiple current collector layers 720. Yet another example is that one surface of the substrate foil 710 may have multiple current collector layers 720, while the opposite surface may not have any current collector layers 720.

[0068] The 700 material strip can be obtained through appropriate current collector fabrication equipment, specifically through the following steps:

[0069] Step S1: Prepare the substrate foil;

[0070] Step S2: Unwind the substrate foil. During the unwinding process, deposit multiple metal layers on the surface of the substrate foil to form at least one current collector layer 720 on the surface of the substrate foil.

[0071] Step S3: The substrate foil with the current collector layer 720 formed on its surface is wound up to obtain strip 700.

[0072] It should be noted that in step S1, the thickness of the substrate foil is generally selected as 4μm-20μm. It serves as a temporary substrate for the current collector layer 720 and does not constitute the structure of the current collector layer 720, that is, it does not affect the thickness of the current collector layer 720. Therefore, the substrate foil 710 can be made of a thicker material to improve the structural strength of the substrate foil 710 and reduce the probability of the substrate foil 710 breaking during the subsequent process of depositing multiple metal layers on the surface of the substrate foil 710 to form at least one current collector layer 720.

[0073] In step S2, multiple electroplating tanks connected in series can be set on the conveying path of the substrate foil. Each electroplating tank contains a plating solution. During the conveying process of the substrate foil, each electroplating tank deposits a metal layer on the surface of the substrate foil, thereby forming at least one current collector layer 720 on the surface of the substrate foil.

[0074] In one embodiment, two stacked current collector layers 720 need to be formed on one surface of the substrate foil, and each current collector layer 720 has three metal layers with a thickness of 1.5 μm. Based on this, six electroplating tanks can be provided, and the six electroplating tanks sequentially deposit a metal layer with a thickness of 1.5 μm on the surface of the substrate foil. In this way, two current collector layers 720 with a thickness of 4.5 μm (1.5 μm * 3) are formed on the corresponding surface of the substrate foil. Of course, the thickness of the metal layers can also be selectively set according to the actual thickness requirements of the current collector.

[0075] In step S3, after the substrate foil with the current collector layer 720 formed on its surface is wound up, the strip 700 is obtained.

[0076] The strip 700 to be stripped by the stripping device of this application can be obtained by the above method.

[0077] Additionally, it should be noted that in the stripping device of this application, the first unwinding mechanism 100 refers to a structure capable of unwinding and outputting the rolled material strip 700 so that the material strip 700 travels along the first preset direction S1. The first unwinding mechanism 100 can be configured as an unwinding roller.

[0078] The first winding mechanism 200 is a structure capable of winding and recovering the substrate foil 710 after the current collector layer 720 has been peeled off, and capable of providing traction force for the strip 700 to travel in the first preset direction S1. It is readily understood that the first winding mechanism 200 is located downstream of the first unwinding mechanism 100 along the travel direction of the strip 700. Similarly, the first winding mechanism 200 can be configured as a winding roller.

[0079] The first preset direction S1 can be set according to the actual site requirements. It can be a straight line trajectory or a curved trajectory, and there is no specific limitation.

[0080] The peeling mechanism 300 is capable of conveying and guiding the strip 700 unwound by the first unwinding mechanism 100 to the first winding mechanism 200 according to a preset belt travel trajectory. At the same time, it can perform a peeling operation on the strip 700 during the belt travel process to peel the current collector layer 720 on the strip 700 passing through the peeling mechanism 300 from the base foil 710 to obtain a thinner current collector layer 720.

[0081] It is easy to understand that the peeling device in this application embodiment is configured with the cooperation of the first unwinding mechanism 100, the peeling mechanism 300 and the first winding mechanism 200. During the process of the peeling mechanism 300 guiding the material strip 700 unwound from the first unwinding mechanism 100 to the first winding mechanism 200 along the first preset direction S1, the current collector layer 720 on the material strip 700 is peeled off. Since the relatively thin current collector layer 720 can be pre-plated onto the surface of the base foil 710 on the material strip 700, and the base foil 710 serves as a temporary substrate for the current collector layer 720, it does not constitute the structure of the current collector layer 720. The current collector layer 720 peeled off by the peeling mechanism 300 is not limited by the thickness of the base foil 710. Therefore, after the stripping mechanism 300 strips the current collector layer 720 on the material belt 700 during the conveying process, it can directly obtain a thinner current collector layer 720. This thinner current collector layer 720 can be directly used as a multi-layer current collector structure for battery preparation after being cut. In this way, the problem of excessively thick overall multi-layer current collector structure caused by the thickness limitation of the substrate foil in traditional foil making machines is overcome, and the energy density of the battery is effectively improved.

[0082] In addition, after the current collector layer 720 on the surface of the substrate foil 710 is peeled off, the substrate foil 710 is wound up by the first winding mechanism 200 to realize the recycling of the substrate foil 710, so that the substrate foil 710 can be used again as a temporary substrate for a thinner current collector layer 720, thereby reducing the battery production cost.

[0083] In some embodiments of this application, see Figure 1 and Figure 2The substrate foil 710 includes a first surface 711 and a second surface 712 opposite to each other along its own thickness direction, and both the first surface 711 and the second surface 712 are provided with a current collector layer 720.

[0084] The peeling mechanism 300 includes a first peeling unit 310 and a second peeling unit 320. The first peeling unit 310 and the second peeling unit 320 are sequentially disposed on the conveyor path of the conveyor belt 700 to peel off the current collector layer 720 on the first surface 711 and the second surface 712, respectively.

[0085] Specifically, the first peeling unit 310 can be configured as a pair of rollers consisting of a guide roller and an adhesive roller. The guide roller guides the material belt 700 to move along the belt, and the adhesive roller adheres to and winds up the current collector layer 720 on the first surface 711, thereby peeling off the current collector layer 720 on the first surface 711 of the substrate foil 710.

[0086] Similarly, the second peeling unit 320 can have the same structure as the first peeling unit 310. The specific structure will not be described in detail. It can peel off the current collector layer 720 on the second surface 712 of the substrate foil 710.

[0087] It should also be noted that during the preparation of the material strip 700 in the early stage, multiple metal layers can be deposited on the first surface 711 of the substrate foil 710 by electroplating to obtain a multi-layer current collector layer 720; similarly, multiple metal layers can be deposited on the second surface 712 of the substrate foil 710 by electroplating to obtain a multi-layer current collector layer 720.

[0088] Understandably, see Figure 1 and Figure 2 During the process of the material strip 700 traveling along the first preset direction S1, the first peeling unit 310 first peels off the current collector layer 720 on the first surface 711 of the substrate foil 710, and the second peeling unit 320 then peels off the current collector layer 720 on the second surface 712 of the substrate foil 710. The peeling actions of the two are independent of each other and do not interfere with each other, so that the current collector layer 720 on the corresponding surface of the substrate foil 710 can be accurately peeled off.

[0089] The substrate foil 710 that has been stripped of the current collector layer 720 is finally wound up by the first winding mechanism 200, realizing the recycling of the substrate foil 710, so that the substrate foil 710 can be used again as a temporary substrate for a thinner current collector layer 720, reducing the battery production cost.

[0090] Thus, during the conveying process of a material strip 700, the current collector layers 720 on the two opposite surfaces of the substrate foil 710 are peeled off one after another to obtain two current collector layers 720. After being cut, both current collector layers 720 can be used as current collectors for the multilayer structure of the battery, which is beneficial to improving the production efficiency of the battery.

[0091] In some embodiments of this application, a plurality of current collector layers 720 are stacked on both the first surface 711 and the second surface 712.

[0092] The first peeling unit 310 and the second peeling unit 320 are both multiple. The multiple first peeling units 310 are used to peel off the multiple current collector layers 720 on the first surface 711 one by one, and the multiple second peeling units 320 are used to peel off the multiple current collector layers 720 on the second surface 712 one by one.

[0093] It should be noted that during the preparation of the material strip 700 in the early stage, multiple metal layers can be deposited on the first surface 711 of the substrate foil 710 by electroplating. At least two adjacent metal layers form a current collector layer 720. In this way, multiple current collector layers 720 are formed on the first surface 711 of the substrate foil 710 in sequence.

[0094] Similarly, multiple metal layers can be deposited on the second surface 712 of the substrate foil 710 by electroplating, and at least two adjacent metal layers form a current collector layer 720. In this way, multiple current collector layers 720 are formed on the second surface 712 of the substrate foil 710 in sequence.

[0095] During the process of the material strip 700 traveling along the first preset direction S1, multiple first peeling units 310 sequentially peel off multiple current collector layers 720 on the first surface 711 of the substrate foil 710, and multiple second peeling units 320 sequentially peel off multiple current collector layers 720 on the second surface 712 of the substrate foil 710. The peeling actions of all the first peeling units 310 and all the second peeling units 320 are independent of each other and do not interfere with each other.

[0096] Thus, during the conveying process of a material strip 700, multiple current collector layers 720 on two opposing surfaces of the substrate foil 710 are peeled off to obtain two or more current collector layers 720. All the current collector layers 720 obtained after peeling can be used as current collectors for the multilayer structure of the battery after being cut, which is beneficial to improving the production efficiency of the battery.

[0097] Further, see Figure 1 All the first stripping units 310 and all the second stripping units 320 are alternately arranged along the conveyor belt path of the conveyor belt 700.

[0098] In one embodiment, the first surface 711 of the substrate foil 710 has two stacked current collector layers 720, and the second surface 712 of the substrate foil 710 has two stacked current collector layers 720.

[0099] Correspondingly, along the conveyor path of the conveyor belt 700, there are sequentially distributed a first stripping unit 310, a second stripping unit 320, a first stripping unit, and a second stripping unit 320.

[0100] As the tape 700 travels along the first preset direction S1, the first peeling unit 310, which is close to the first unwinding mechanism 100, firstly peels off the outer layer 720 of the current collector layer 710 on the first surface 711 of the substrate foil 710. As the tape 700 continues to travel, the second peeling unit 320, which is close to the first unwinding mechanism 100, then peels off the outer layer 720 of the current collector layer 710 on the second surface 712 of the substrate foil 710. As the tape 700 continues to travel, the first peeling unit 310, which is away from the first unwinding mechanism 100, then peels off the inner layer 720 of the current collector layer 710 on the first surface 711 of the substrate foil 710. As the tape 700 continues to travel, the second peeling unit 320, which is away from the first unwinding mechanism 100, then peels off the inner layer 720 of the current collector layer 710 on the second surface 712 of the substrate foil 710. Finally, the exposed substrate foil 710 is wound up by the first winding mechanism 200, thus realizing the recycling of the substrate foil 710.

[0101] It is easy to understand that by alternately arranging all the first stripping units 310 and all the second stripping units 320 along the conveyor belt 700, the two current collector layers 720 that are symmetrical on the two opposite surfaces of the substrate foil 710 can be stripped in sequence, reducing the probability of the substrate foil 710 breaking due to uneven force on the two opposite surfaces during the conveyor belt process. Moreover, the current collector layers 720 on the two opposite surfaces of the substrate foil 710 can be collected more accurately.

[0102] In some embodiments of this application, see Figure 1 The first stripping unit 310 includes a first guide roller 311, a first stripping roller 312 and a first recovery roller 313, and a first roller gap 314 is formed between the first guide roller 311 and the first stripping roller 312 through which the feed belt 700 passes.

[0103] The first peeling roller 312 is used to peel off the current collector layer 720 on the first surface 711 and convey it to the first recovery roller 313. The first recovery roller 313 is used to wind up the current collector layer 720. The first guide roller 311 is used to convey the material belt 700 to the second peeling unit 320.

[0104] Specifically, the first guide roller 311 and the first stripping roller 312 are arranged opposite each other along the height direction. The first stripping roller 312 is located above the first guide roller 311. The vertical projections of their axes in the height direction coincide. The axial lengths of both are greater than the width of the material strip 700, so that the material strip 700 will not protrude from both ends of the first guide roller 311 when it is wrapped around the outer peripheral surface of the first guide roller 311, so that the material strip 700 can travel more stably.

[0105] The first guide roller 311 and the first peeling roller 312 have the same surface linear velocity but rotate in opposite directions. The first peeling roller 312 can be configured as an adhesive roller so that the first peeling roller 312 can pre-adhere the head of the current collector layer 720 of the first surface 711 of the substrate foil 710.

[0106] The first recovery roller 313 is positioned above the first stripping roller 312 and is offset from the first stripping roller 312 in the height direction, so that the current collector layer 720 peeled off from the first surface 711 of the substrate foil 710 is carried along a meandering trajectory and finally wound up and recovered by the first recovery roller 313, thereby reducing the space occupied by the first recovery roller 313.

[0107] Understandably, when the strip 700 unwound by the first unwinding mechanism 100 passes around the first guide roller 311, the first peeling roller 312 adheres the head of the current collector layer 720 on the first surface 711 of the base foil 710. Under the opposite rotation of the first guide roller 311 and the first peeling roller 312, the first peeling roller 312 peels the corresponding current collector layer 720 from the first surface 711 of the base foil 710 and winds it onto the first take-up roller 313 under the traction of the first take-up roller 313.

[0108] During the process of peeling the current collector layer 720 on the first surface 711 of the substrate foil 710 of the strip 700, the strip 700 is simultaneously pulled and conveyed to the second peeling unit 320 by the first guide roller 311 so that the second peeling unit 320 can peel the current collector layer 720 on the second surface 712 of the substrate foil 710.

[0109] It is easy to understand that by setting the first peeling unit 310 as a cooperative structure of the first guide roller 311, the first peeling roller 312 and the first recovery roller 313, the current collector layer 720 of the first surface 711 of the substrate foil 710 of the strip 700 is accurately peeled off by means of the mutual and opposite rotation of the first guide roller 311 and the first peeling roller 312. The first recovery roller 313 then winds up and recovers the peeled current collector layer 720, thereby obtaining a thinner current collector layer 720.

[0110] Furthermore, the surface linear velocity of the first guide roller 311 is configured to be equal to and opposite in direction to the surface linear velocity of the first stripping roller 312.

[0111] It should be understood that the rotation of the first guide roller 311 and the first stripping roller 312 is driven by two independent drive mechanisms, such as two independent motors or two independent motors.

[0112] It should be noted that both the first guide roller 311 and the first stripping roller 312 are rotating rollers that rotate around their own axes. The linear velocity of the roller surface refers to the velocity of any point on the roller surface, and the rotational speed of the roller refers to the number of revolutions per minute. Given the same roller diameter, rollers with the same rotational speed will have the same linear velocity. Theoretically, the linear velocity of the roller surface and the rotational speed of the roller are related as follows: Linear velocity of roller surface = Roller surface length * Rotational speed * π ÷ 60, where the roller surface length refers to the contact length between the rotating roller and the material strip 700, which is usually the axial length of the rotating roller, and π is pi.

[0113] By setting the surface linear velocity of the first guide roller 311 to be equal to and opposite in direction to the surface linear velocity of the first peeling roller 312, the peeling length of the current collector layer 720 of the first surface 711 of the substrate foil 710 peeled by the first peeling roller 312 is the same as the conveying length of the conveying belt 700 of the first guide roller 311. This allows the current collector layer 720 of the first surface 711 of the substrate foil 710 to be completely peeled off by the first peeling roller 312, and also reduces the probability of wrinkling of the current collector layer 720 and the remaining belt 700 during the peeling process of the first peeling roller 312, thereby improving the stability of the peeling of the current collector layer 720 of the first surface 711 of the substrate foil 710 by the first peeling roller 312.

[0114] Further, see Figure 1 The radius of the first guide roller 311 is greater than the radius of the first stripping roller 312.

[0115] Specifically, the radius of the first guide roller 311 is R1, and the radius of the first stripping roller 312 is r1, where R1 is greater than r1. More specifically, R1 is greater than three times r1, and R1 is greater than 0.5m.

[0116] This configuration increases the contact area between the material strip 700 and the first guide roller 311, improves the surface tension of the material strip 700 during its travel along the first preset direction S1, and allows the first peeling roller 312 to peel the current collector layer 720 more smoothly from the corresponding surface of the base foil 710. In addition, it enables the material strip 700 to be conveyed more stably along the first preset direction S1.

[0117] In some embodiments of this application, see Figure 1The second stripping unit 320 includes a second guide roller 321, a second stripping roller 322 and a second recovery roller 323, and a second roller gap 324 is formed between the second guide roller 321 and the second stripping roller 322 through which the feed belt 700 passes.

[0118] The second peeling roller 322 is used to peel the current collector layer 720 on the second surface 712 and convey it to the second recovery roller 323. The second recovery roller 323 is used to wind up the current collector layer 720. The second guide roller 321 is used to convey the base foil 710 of the peeled current collector layer 720 to the first winding mechanism 200.

[0119] Specifically, see Figure 1 The second guide roller 321 and the second stripping roller 322 are arranged opposite each other along the height direction. The second stripping roller 322 is located below the second guide roller 321. The vertical projections of their axes in the height direction coincide. The axial lengths of both are greater than the width of the material strip 700, so that the material strip 700 will not protrude from both ends of the second guide roller 321 when it is wrapped around the outer peripheral surface of the second guide roller 321, so that the material strip 700 can travel more stably.

[0120] The second guide roller 321 and the second peeling roller 322 have the same surface linear velocity but rotate in opposite directions. The second peeling roller 322 can be configured as an adhesive roller so that the second peeling roller 322 can pre-adhere the head of the current collector layer 720 of the second surface 712 of the substrate foil 710.

[0121] The second recovery roller 323 is positioned below the second stripping roller 322 and is offset from the second stripping roller 322 in the height direction, so that the current collector layer 720 peeled off from the second surface 712 of the substrate foil 710 is carried along a meandering trajectory and finally wound up and recovered by the second recovery roller 323, reducing the space occupied by the second recovery roller 323.

[0122] Understandably, the material strip 700 conveyed by the first guide roller 311 passes around the second guide roller 321. At this time, the second peeling roller 322 adheres the head of the current collector layer 720 on the second surface 712 of the base foil 710. Under the opposite rotation of the second guide roller 321 and the second peeling roller 322, the second peeling roller 322 peels the corresponding current collector layer 720 from the second surface 712 of the base foil 710 and winds it onto the second recovery roller 323 under the traction of the second recovery roller 323.

[0123] During the process of peeling the current collector layer 720 of the second surface 712 of the base foil 710 of the strip 700, the base foil 710 is simultaneously pulled and conveyed to the first winding mechanism 200 by the second guide roller 321 so that the first winding mechanism 200 can rewind and recycle the base foil 710.

[0124] It is easy to understand that by setting the second peeling unit 320 as a cooperative structure of the second guide roller 321, the second peeling roller 322 and the second recovery roller 323, the current collector layer 720 of the second surface 712 of the substrate foil 710 of the material strip 700 is accurately peeled off by means of the mutual and opposite rotation of the second guide roller 321 and the second peeling roller 322. The second recovery roller 323 then winds up and recovers the peeled current collector layer 720, thereby obtaining a thinner current collector layer 720.

[0125] Furthermore, the surface linear velocity of the second guide roller 321 is configured to be equal to and opposite in direction to the surface linear velocity of the second stripping roller 322.

[0126] It should be understood that the rotation of the second guide roller 321 and the second stripping roller 322 is driven by two independent drive mechanisms, such as two independent motors or two independent motors.

[0127] It should be noted that both the second guide roller 321 and the second stripping roller 322 are rotating rollers that rotate around their own axes. Based on the above, the surface linear velocity of the rotating rollers will not be described again.

[0128] By setting the surface linear speed of the second guide roller 321 to be equal to and opposite in direction to the surface linear speed of the second peeling roller 322, the peeling length of the current collector layer 720 on the second surface 712 of the substrate foil 710 peeled by the second peeling roller 322 is the same as the conveying length of the conveying belt 700 of the second guide roller 321. This allows the current collector layer 720 on the second surface 712 of the substrate foil 710 to be completely peeled off by the second peeling roller 322. It also reduces the probability of wrinkling of the current collector layer 720 and the remaining substrate foil 710 during the peeling process of the second peeling roller 322, and improves the stability of the peeling of the current collector layer 720 on the second surface 712 of the substrate foil 710 by the second peeling roller 322.

[0129] Furthermore, the radius of the second guide roller 321 is larger than the radius of the second stripping roller 322.

[0130] Specifically, the radius of the second guide roller 321 is R2, and the radius of the second stripping roller 322 is r2, where R2 is greater than r2. More specifically, R2 is greater than three times r2, and R2 is greater than 0.5m.

[0131] This configuration increases the contact area between the material strip 700 and the second guide roller 321, improves the surface tension of the material strip 700 during its travel along the first preset direction S1, and allows the second peeling roller 322 to peel the current collector layer 720 more smoothly from the corresponding surface of the base foil 710. In addition, it enables the material strip 700 to be conveyed more stably along the first preset direction S1.

[0132] Furthermore, in some embodiments of this application, see Figure 1 At least one tensioning roller 330 is provided between the second guide roller 321 and the first winding mechanism 200 for the substrate foil 710 to be wound. The tensioning roller 330 guides and tensions the substrate foil 710, which has been stripped of the current collector layer 720, so that the substrate foil 710 is wound more stably on the first winding mechanism 200.

[0133] In some embodiments of this application, the strip 700 further includes an oxide layer (not shown in the figure), which is disposed between the substrate foil 710 and the current collector layer 720.

[0134] Specifically, the substrate foil 710 may be, but is not limited to, metal foils such as stainless steel foil and titanium foil, and the oxide layer is a metal oxide layer oxidized on the surface of the substrate foil 710.

[0135] The oxide layer can weaken the bonding force between the current collector layer 720 and the substrate foil 710, thereby reducing the difficulty of peeling the current collector layer 720 from the surface of the substrate foil 710 and making it easier to peel the current collector layer 720 from the surface of the substrate foil 710.

[0136] In addition, this application also provides a current collector fabrication device, which includes the stripping device of any of the above embodiments.

[0137] The current collector fabrication equipment of this application embodiment, due to the configuration of the above-mentioned stripping device, also has the same technical effect brought by the stripping device, that is, it can directly obtain a thinner current collector layer 720. After being cut, the thinner current collector layer 720 can be directly used as a multi-layer current collector structure for battery fabrication, overcoming the problem that the multi-layer current collector structure prepared by the traditional foil making machine is too thick due to the thickness limitation of the substrate foil, and effectively improving the energy density of the battery.

[0138] In some embodiments of this application, see Figure 1 and Figure 3 The current collector manufacturing equipment also includes a second unwinding mechanism 400, an electroplating assembly 500, and a second winding mechanism 600.

[0139] The second unwinding mechanism 400 is used to unwind the base foil 710 so that the base foil 710 travels along the second preset direction S2.

[0140] The electroplating assembly 500 includes a plurality of electroplating tanks 510, all of which are arranged in series along the conveyor path of the substrate foil 710 to deposit a metal layer 721 on the surface of the substrate foil 710 in sequence, so that a current collector layer 720 is formed on at least one side of the substrate foil 710.

[0141] The second winding mechanism 600 is used to wind up the substrate foil 710 on which the current collector layer 720 is formed.

[0142] Specifically, the second unwinding mechanism 400 refers to a structure that can unwind and output the substrate foil 710 in a roll so that the substrate foil 710 travels along the second preset direction S2. The second unwinding mechanism 400 can be configured as an unwinding roller.

[0143] Of course, in order to improve the stability of the substrate foil 710, the second unwinding mechanism 400 may also include a plurality of third guide rollers 410. The plurality of third guide rollers 410 are distributed at intervals along the belt path of the substrate foil 710. The third guide rollers 410 guide and tension the substrate foil 710, thereby stabilizing the belt path of the substrate foil 710.

[0144] The second winding mechanism 600 refers to a structure capable of winding up the substrate foil 710 on which the current collector layer 720 is formed. Similarly, the second winding mechanism 600 can be configured as a winding roller. It is easy to understand that the second winding mechanism 600 is located downstream of the electroplating assembly 500 along the belt travel direction of the substrate foil 710. After the current collector layer 720 is formed on the surface of the substrate foil 710, the current collector layer 720 and the substrate foil 710 together constitute the aforementioned strip 700.

[0145] In the electroplating assembly 500, each electroplating tank 510 contains a plating solution for forming a corresponding metal layer 721. After the substrate foil 710 is released from the second unwinding mechanism 400, it is guided by multiple third guide rollers 410 and sequentially immersed in each electroplating tank 510 to form multiple stacked metal layers 721 on the corresponding surface of the substrate foil 710, thereby forming at least one current collector layer 720 composed of multiple metal layers 721 on the corresponding surface of the substrate foil 710. The substrate foil 710 with the current collector layer 720 formed on its surface is wound onto the second winding mechanism 600.

[0146] It is easy to understand that the current collector fabrication equipment in this embodiment of the application, through the coordinated arrangement of the second unwinding mechanism 400, the electroplating assembly 500, and the second winding mechanism 600, deposits a metal layer 721 of appropriate thickness onto the surface of the substrate foil 710 through the electroplating tanks 510 of the electroplating assembly 500, forming a relatively thin current collector layer 720. The stacked current collector layer 720 and the substrate foil 710 together constitute the strip 700, which is then used by the peeling device to peel off the current collector layer 720. The substrate foil 710 serves as a temporary substrate for the current collector layer 720 and does not constitute the structure of the current collector layer 720, so that the subsequent peeling device is not limited by the thickness of the substrate foil 710 when peeling the current collector layer 720 from the substrate foil 710.

[0147] Thus, after the stripping mechanism 300 strips the current collector layer 720 on the material belt 700 during the conveying process, a thinner current collector layer 720 can be directly obtained. This thinner current collector layer 720 can be directly used as a multi-layer current collector structure for battery fabrication after being cut. In this way, the problem of excessively thick overall multi-layer current collector structure caused by the thickness limitation of the substrate foil in traditional foil making machines is overcome, and the energy density of the battery is effectively improved.

[0148] In addition, this application embodiment also provides a battery production system, which includes the current collector fabrication equipment of any of the above.

[0149] It is easy to understand that the battery production system of this application embodiment, due to the configuration of the above-mentioned current collector fabrication equipment, also has the same technical effect brought by the current collector fabrication equipment, that is, it can directly obtain a thin current collector layer 720. After being cut, the thin current collector layer 720 can be directly used as the multi-layer current collector structure for battery preparation, overcoming the problem that the multi-layer structure current collector prepared by the traditional foil making machine is too thick due to the thickness limitation of the substrate foil, and effectively improving the energy density of the battery.

[0150] See Figures 1 to 3 This application provides a stripping device, a current collector fabrication device, and a battery production system.

[0151] The peeling device includes: a first unwinding mechanism 100 for unwinding a strip 700, the strip 700 including a base foil 710 and a current collector layer 720 layered on at least one side surface of the base foil 710; a first winding mechanism 200 for winding the base foil 710; and a peeling mechanism 300 for guiding the strip 700 along a first preset direction S1 to the first winding mechanism 200, and capable of peeling the current collector layer 720 from the strip 700 passing through it.

[0152] The current collector manufacturing equipment includes the stripping device described above.

[0153] The battery production system includes the aforementioned current collector fabrication equipment.

[0154] The stripping device, current collector fabrication equipment, and battery production system of this application embodiment can directly obtain a thin current collector layer 720. After being cut, the thin current collector layer 720 can be directly used as a multi-layer current collector structure for battery fabrication, overcoming the problem that the multi-layer current collector structure prepared by traditional foil making machines is too thick due to the thickness limitation of the substrate foil, and effectively improving the energy density of the battery.

[0155] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0156] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A peeling device, characterized in that, include: A first unwinding mechanism is used to unwind a strip of material, the strip comprising a base foil and a current collector layer disposed on at least one surface of the base foil; A first winding mechanism is used to wind up the base foil; The peeling mechanism is used to guide the material strip along a first preset direction to the first winding mechanism, and is capable of peeling the current collector layer on the material strip that passes through it.

2. The stripping device according to claim 1, characterized in that, The substrate foil includes a first surface and a second surface opposite each other along its own thickness direction, and both the first surface and the second surface are provided with a current collector layer; The peeling mechanism includes a first peeling unit and a second peeling unit, which are sequentially disposed on the conveyor path of the conveyor belt to peel off the current collector layer on the first surface and the second surface, respectively.

3. The stripping device according to claim 2, characterized in that, Multiple current collector layers are stacked on both the first surface and the second surface; Both the first stripping unit and the second stripping unit are multiple. The multiple first stripping units are used to strip the multiple current collector layers on the first surface one by one, and the multiple second stripping units are used to strip the multiple current collector layers on the second surface one by one.

4. The peeling device according to claim 3, characterized in that, All of the first stripping units and all of the second stripping units are alternately arranged along the conveyor belt path.

5. The stripping device according to claim 2, characterized in that, The first stripping unit includes a first guide roller, a first stripping roller, and a first recovery roller, with a first roller gap formed between the first guide roller and the first stripping roller for the material strip to pass through; The first stripping roller is used to strip the current collector layer on the first surface and convey it to the first recovery roller, the first recovery roller is used to wind up the current collector layer, and the first guide roller is used to convey the material strip to the second stripping unit.

6. The stripping device according to claim 5, characterized in that, The linear velocity of the first guide roller is configured to be equal to, but opposite in direction to, the linear velocity of the first stripping roller.

7. The stripping device according to claim 5, characterized in that, The radius of the first guide roller is larger than the radius of the first stripping roller.

8. The stripping device according to claim 2 or 5, characterized in that, The second stripping unit includes a second guide roller, a second stripping roller, and a second recovery roller, with a second roller gap formed between the second guide roller and the second stripping roller for the material strip to pass through; The second peeling roller is used to peel the current collector layer on the second surface and convey it to the second recovery roller, the second recovery roller is used to wind up the current collector layer, and the second guide roller is used to convey the substrate foil to which the current collector layer has been peeled to the first winding mechanism.

9. The stripping device according to claim 8, characterized in that, The linear velocity of the second guide roller is configured to be equal to and opposite in direction to the linear velocity of the second stripping roller.

10. The peeling device according to claim 9, characterized in that, The radius of the second guide roller is larger than the radius of the second stripping roller.

11. A current collector manufacturing device, characterized in that, Includes the stripping device as described in any one of claims 1 to 10.

12. The current collector manufacturing equipment according to claim 11, characterized in that, Also includes: The second unwinding mechanism is used to unwind the base foil so that the base foil travels along a second preset direction. An electroplating assembly includes multiple electroplating tanks, all of which are connected in series along the conveyor path of the substrate foil to sequentially plate a metal layer on the surface of the substrate foil, so that a current collector layer is formed on at least one side surface of the substrate foil. The second winding mechanism is used to wind up the substrate foil on which the current collector layer is formed.

13. A battery production system, characterized in that, Includes the current collector fabrication equipment as described in claim 11 or 12.

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