Apparatus and method for treating substrates

Abstract

The present application provides an apparatus and method for processing a substrate, which can effectively process the substrate, reduce the complexity of the apparatus, and improve the quality of the finished product. The substrate includes a first surface and a second surface perpendicular to its thickness direction, and the apparatus includes: a first coating device for coating a material on the first surface; a second coating device for coating a material on the roller surface of a first pressing roller, the material being used to form a first film material and a second film material on the first surface and the roller surface of the first pressing roller, respectively; a rolling device including a first pressing roller and a second pressing roller arranged opposite to each other, the first surface being arranged toward the roller surface of the second pressing roller, and the second surface being arranged away from the roller surface of the second pressing roller, the rolling device being used to transfer the substrate between the first pressing roller and the second pressing roller, so that when the substrate passes between the first pressing roller and the second pressing roller, the first film material is pressed against the first surface, and the second film material is transferred from the roller surface of the first pressing roller and pressed against the second surface.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an apparatus and method for processing a substrate. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] Typically, a battery consists of multiple cells, each of which includes an electrode assembly. The electrode assembly consists of a positive electrode sheet and a negative electrode sheet, generating electricity through the movement of metal ions between the positive and negative electrodes. A key step in the electrode sheet manufacturing process is double-coating a substrate with material and then roll-forming it to form the electrode sheet. Therefore, how to effectively process the substrate to produce the electrode sheet has become a pressing issue. Summary of the Invention

[0004] The present application provides an apparatus and method for processing a substrate, which can effectively process the substrate, reduce the complexity of the apparatus and improve the quality of the finished product.

[0005] In a first aspect, a device for processing a substrate is provided, wherein the substrate comprises a first surface and a second surface perpendicular to the thickness direction of the substrate, comprising:

[0006] A first coating device is used to coat a material on the first surface, wherein the material is used to form a first film material on the first surface;

[0007] a second coating device, configured to coat the material on the roller surface of the first pressing roller, wherein the material is used to form a second film material on the roller surface of the first pressing roller;

[0008] A rolling device is arranged downstream of the first coating device and the second coating device, and the rolling device includes the first pressing roller and the second pressing roller arranged opposite to each other, the first surface is arranged toward the roller surface of the second pressing roller, and the second surface is arranged away from the roller surface of the second pressing roller. The rolling device is used to transfer the substrate between the first pressing roller and the second pressing roller, so that when the substrate passes between the first pressing roller and the second pressing roller, the first film material is bonded to the first surface under the pressure between the first pressing roller and the second pressing roller, and the second film material is transferred from the roller surface of the first pressing roller and bonded to the second surface.

[0009] According to this technical solution, first, a first coating device and a second coating device coat the first surface of a substrate and the surface of a first roller, respectively, to form a first film material and a second film material on the first surface of the substrate and the surface of the first roller. Second, a rolling device presses the first film material and the second film material onto the first surface and the second surface, respectively. Specifically, the rolling device includes a first roller and a second roller arranged side by side. The substrate is conveyed between the first roller and the second roller, with the first surface of the substrate facing the surface of the second roller and the second surface of the substrate facing away from the surface of the second roller. As the substrate passes between the first roller and the second roller, the first film material previously coated on the first surface of the substrate is pressed onto the first surface under the pressure between the first roller and the second roller. Meanwhile, the second film material previously coated on the surface of the first roller is transferred to the second surface of the substrate due to the difference in adhesion between the roller surface and the substrate. There, the second film material is pressed onto the second surface of the substrate under the pressure between the first roller and the second roller. Since the first film material and the second film material are pressed onto the first surface and the second surface of the substrate at the same time, there is no need to repeatedly rewind and unwind during the entire substrate processing process, which reduces the complexity of the equipment. In addition, the force on the first surface and the second surface of the substrate is uniform, which reduces problems such as cracking caused by uneven stress and improves the quality of the finished product.

[0010] In some embodiments, the roller pressing device is used to transfer the substrate between the first pressing roller and the second pressing roller via the second pressing roller, thereby simplifying the roller system structure.

[0011] In some embodiments, the apparatus further includes: a first heating device for heating the material to form the first film material.

[0012] The first heating device can heat the material coated on the first surface of the substrate by, for example, infrared heating or hot oil medium heating, so as to melt the adhesive particles in the material and then make the dry powder in the material stick together to form a flaky coating with poor fluidity, i.e., the first film material.

[0013] In some embodiments, the apparatus further includes: a second heating device for heating the material to form the second film material.

[0014] The second heating device can, for example, use infrared heating or hot oil medium heating to heat the material coated on the roller surface of the first pressure roller, so that the adhesive particles in the material melt and then the dry powder in the material sticks together to form a flaky coating with poor fluidity, namely the second film material.

[0015] In some embodiments, the second heating device includes: a plurality of heating tubes arranged in an arc shape around the roller surface of the first pressing roller.

[0016] The heating tubes are arranged in an arc shape around the roller surface of the first pressing roller, so that the roller surface of the first pressing roller can be heated evenly, thereby improving the uniformity of the first film material and ensuring the consistency of the finished product.

[0017] In some embodiments, the first coating device includes: a first feeding unit, including a first feeding port; a first coating roller, arranged at the first feeding port; and a second coating roller, arranged opposite to the first coating roller, so as to coat the material delivered from the first feeding port on the first surface when the substrate passes between the first coating roller and the second coating roller.

[0018] In this way, when the material is transported from the first material outlet to the first surface of the substrate, the material will be evenly coated on the first surface of the substrate due to the pressure between the first coating roller and the second coating roller, thereby ensuring coating uniformity.

[0019] In some embodiments, the first feeding unit includes: a first baffle; and a first ultrasonic plate, which forms the first feeding opening with the first baffle. The first ultrasonic plate is configured to generate ultrasonic vibrations to uniformly feed the material through the first feeding opening. The first ultrasonic plate's ability to generate ultrasonic vibrations allows the material to be uniformly discharged from the first feeding opening, ensuring stable feeding.

[0020] In some embodiments, the second coating device includes: a second feeding unit, including a second blanking port; a third coating roller, located at the second blanking port and arranged opposite to the first pressure roller, so that when the first pressure roller and the third coating roller rotate relative to each other, the material conveyed from the second blanking port is coated on the roller surface of the first pressure roller.

[0021] In this way, when the material is transported from the second blanking port to the roller surface of the first pressing roller, due to the pressure between the first pressing roller and the third coating roller, the material will be evenly coated on the roller surface of the first pressing roller, ensuring the uniformity of coating.

[0022] In some embodiments, the second feeding unit includes: a second baffle; and a second ultrasonic plate, which forms the second feeding port with the second baffle. The second ultrasonic plate is configured to generate ultrasonic vibrations to uniformly feed the material through the second feeding port. The second ultrasonic plate's ability to generate ultrasonic vibrations allows the material to be uniformly discharged from the second feeding port, ensuring stable feeding.

[0023] In some embodiments, the apparatus further comprises: an unwinding roller for releasing the unprocessed substrate; a rewinding roller for rewinding the substrate processed by the rolling device; a traction roller disposed between the first coating device and the unwinding roller and configured to provide traction for conveying the substrate; and a tension roller disposed between the first coating device and the unwinding roller and configured to detect tension in the substrate during conveyance, the tension being used to adjust the rotational speed of at least one of the unwinding roller, the rewinding roller, and the traction roller. By detecting the tension of the substrate during conveyance via the tension roller, the rotational speeds of the unwinding roller, the rewinding roller, the traction roller, and the like can be adjusted based on the substrate tension as fed back by the tension roller, thereby ensuring smooth conveyance of the substrate, ensuring stability in the substrate coating and rolling processes, and improving the quality of the finished product.

[0024] In some embodiments, the apparatus further comprises: at least one roller disposed between the unwinding roller and the first coating device, and / or between the winding roller and the roller pressing device, for changing the conveying direction of the substrate. The position of the roller can be adjusted based on the roller system requirements, thereby optimizing the apparatus structure by changing the conveying direction of the substrate.

[0025] In a second aspect, a method for processing a substrate is provided, wherein the substrate includes a first surface and a second surface perpendicular to the thickness direction of the substrate, the method comprising:

[0026] coating the first surface with a material by a first coating device, wherein the material is used to form a first film material on the first surface;

[0027] The material is coated on the roller surface of the first pressing roller by a second coating device, and the material is used to form a second film material on the roller surface of the first pressing roller;

[0028] The substrate is subjected to a rolling process by a rolling device, wherein the rolling device includes the first pressing roller and the second pressing roller arranged opposite to each other, the first surface is arranged toward the roller surface of the second pressing roller, and the second surface is arranged away from the roller surface of the second pressing roller, and the rolling device is used to transfer the substrate between the first pressing roller and the second pressing roller, so that when the substrate passes between the first pressing roller and the second pressing roller, the first film material is pressed to the first surface under the pressure between the first pressing roller and the second pressing roller, and the second film material is transferred from the roller surface of the first pressing roller and pressed to the second surface.

[0029] In some embodiments, the roller pressing device is configured to transfer the substrate between the first pressing roller and the second pressing roller via the second pressing roller.

[0030] In some embodiments, the method further includes: heating the material coated on the first surface by a first heating device to form the first film material.

[0031] In some embodiments, the method further includes: heating the material coated on the roller surface of the first pressing roller by a second heating device to form the second film material.

[0032] In some embodiments, the second heating device includes a plurality of heating tubes arranged in an arc shape around the roller surface of the first pressing roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0034] Figure 1 It is a structural schematic diagram of a vehicle disclosed in an embodiment of the present application;

[0035] Figure 2 This is a schematic structural diagram of a battery disclosed in an embodiment of the present application;

[0036] Figure 3 This is a schematic structural diagram of a battery cell disclosed in an embodiment of the present application;

[0037] Figure 4 Schematic diagram of the structure of the substrate processing device disclosed in the embodiment of the present application;

[0038] Figure 5 is based on Figure 4 A structural diagram of a specific implementation of the device;

[0039] Figure 6 It is a schematic flow chart of the method for treating a substrate disclosed in the examples of the present application.

[0040] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0041] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0043] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0044] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0045] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0046] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0047] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

[0048] The battery referred to in this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. Batteries generally include a housing that encloses one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0049] In some embodiments, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., but the embodiments of the present application are not limited to this. Generally, a battery cell is also referred to as a battery cell. The battery cell may be cylindrical, flat, rectangular, or other regular or irregular shapes. The technical solutions of the embodiments of the present application can be applied to battery cells of any shape.

[0050] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer, and the current collector uncoated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer, and the current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure that high current can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together. The separator can be made of polypropylene (PP) or polyethylene (PE). In addition, the electrode assembly can be a wound structure or a laminated structure, but the embodiments of the present application are not limited to this.

[0051] The battery housing may also include a signal transmission component. The signal transmission component may be used to transmit signals such as the voltage and / or temperature of the battery cell. The signal transmission component may include a busbar component, which is used to achieve electrical connection between multiple battery cells, such as parallel, series or mixed connection. The busbar component can achieve electrical connection between battery cells by connecting the electrode terminals of the battery cells. In some embodiments, the busbar component can be fixed to the electrode terminals of the battery cell by welding. The busbar component transmits the voltage of the battery cell. When multiple battery cells are connected in series, a higher voltage will be obtained. Accordingly, the electrical connection formed by the busbar component can also be called a "high voltage connection."

[0052] In addition to the busbar assembly, the signal transmission assembly may also include a sensor device for sensing the status of the battery cells. For example, the sensor device may be used to measure and transmit sensor signals such as the temperature and state of charge of the battery cells. In the embodiment of the present application, the electrical connection components within the battery may include the busbar assembly and / or the sensor device.

[0053] The busbar assembly and sensor components can be encapsulated in an insulating layer to form a signal transmission assembly. Accordingly, the signal transmission assembly can be used to transmit the voltage and / or sensing signals of the battery cells. The signal transmission assembly is free of an insulating layer at the connection points with the battery cell electrode terminals. Instead, the insulating layer has openings at these locations, allowing for connection to the battery cell electrode terminals.

[0054] The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as energy density, cycle life, discharge capacity, charge / discharge rate, and safety. These factors are all related to the quality of the tabs in the electrode assemblies within the battery cells, necessitating optimization of the tab manufacturing process.

[0055] In view of this, the present application provides a technical solution. First, the first surface of the substrate and the roller surface of the first pressure roller are coated by the first coating device and the second coating device to form a first film material and a second film material on the first surface of the substrate and the roller surface of the first pressure roller respectively. Secondly, when the substrate is transferred between the first pressure roller and the second pressure roller, the first film material is pressed to the first surface by the pressure between the first pressure roller and the second pressure roller, and the second film material is transferred from the roller surface of the first pressure roller and pressed to the second surface. Since the first film material and the second film material are pressed to the first surface and the second surface of the substrate at the same time, the entire electrode production process does not require repeated winding and unwinding, which reduces the complexity of the equipment. In addition, the force on the first surface and the second surface of the electrode is uniform, which reduces problems such as cracking caused by uneven stress and improves the quality of the finished product.

[0056] The technical solutions described in the embodiments of the present application are applicable to various devices that use batteries, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0057] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0058] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 can be provided inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 40. For example, a battery 10 can be provided at the bottom, front or rear of the vehicle 1. The battery 10 can be used to power the vehicle 1. For example, the battery 10 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements of the vehicle 1 during startup, navigation and operation. In another embodiment of the present application, the battery 10 can not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0059] In order to meet different power requirements, the battery 10 may include multiple battery cells. Among them, multiple battery cells can be connected in series, in parallel, or in hybrid connection. Hybrid connection refers to a mixture of series and parallel connections. The battery can also be called a battery pack. In some embodiments, multiple battery cells can first be connected in series, in parallel, or in hybrid connection to form a battery module, and multiple battery modules can then be connected in series, in parallel, or in hybrid connection to form the battery 10. In other words, multiple battery cells can directly form the battery 10, or they can first form a battery module, and then the battery modules can form the battery 10.

[0060] For example, Figure 2 As shown in FIG. 1 , a schematic diagram of the structure of a battery 10 according to an embodiment of the present application is shown. The battery 10 may include at least one battery module 200. The battery module 200 includes a plurality of battery cells 20. The battery 10 may also include a housing 11, which has a hollow interior and houses the plurality of battery cells 20. Figure 2As shown, the box body 11 may include two parts, which are respectively referred to as a first box body portion 111 (upper box body) and a second box body portion 112 (lower box body). The first box body portion 111 and the second box body portion 112 are buckled together. The shapes of the first box body portion 111 and the second box body portion 112 may be determined according to the shapes of the combination of multiple battery cells 20. At least one of the first box body portion 111 and the second box body portion 112 may have an opening. For example, Figure 2 As shown, the first box body 111 and the second box body 112 can both be hollow rectangular parallelepipeds and each have only one open face. The opening of the first box body 111 and the opening of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box body 11 with a closed chamber. For another example, different from Figure 2 As shown, only one of the first and second housing portions 111, 112 may be a hollow rectangular parallelepiped with an opening, while the other may be plate-shaped to cover the opening. For example, in this example, the second housing portion 112 is a hollow rectangular parallelepiped with only one open face, and the first housing portion 111 is plate-shaped. In this example, the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 having a closed chamber, which can be used to accommodate multiple battery cells 20. Multiple battery cells 20 are connected in parallel, series, or in a mixed combination and placed within the housing 11 formed by the first and second housing portions 111, 112 being fastened together.

[0061] In some embodiments, the battery 10 may further include other structures, which will not be described in detail here. For example, the battery 10 may further include a busbar component, which is used to achieve electrical connection between multiple battery cells 20. Specifically, the busbar component can achieve electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. In some embodiments, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the box 11 through a conductive mechanism. The conductive mechanism can also be a busbar component.

[0062] As an example, Figure 3, which is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application, wherein the battery cell 20 includes one or more electrode assemblies 22, a shell 211 and an end cover 212. The shell 211 and the end cover 212 form an outer shell or battery box 21. The walls of the shell 211 and the end cover 212 are both referred to as the walls of the battery cell 20, wherein for a rectangular battery cell 20, the walls of the shell 211 include a bottom wall and four side walls. The shell 211 is determined according to the shape of the one or more electrode assemblies 22 after being combined. For example, the shell 211 can be a hollow cuboid, a cube or a cylinder, and one of the faces of the shell 211 has an opening so that one or more electrode assemblies 22 can be placed in the shell 211. For example, when the shell 211 is a hollow cuboid or a cube, one of the planes of the shell 211 is an open surface, that is, the plane has no wall, so that the inside and outside of the shell 211 are connected. When the housing 211 is a hollow cylinder, the end surface of the housing 211 is an open surface, that is, the end surface has no wall, so that the inside and outside of the housing 211 are connected. The end cap 212 covers the opening and is connected to the housing 211 to form a closed cavity for accommodating the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0063] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the end cap 212. The end cap 212 is typically flat, with the two electrode terminals 214 secured to the flat surface of the end cap 212. The two electrode terminals 214 are a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connecting member 23, also known as a current collecting member 23, located between the end cap 212 and the electrode assembly 22 to provide an electrical connection between the electrode assembly 22 and the electrode terminal 214.

[0064] like Figure 3 As shown, each electrode assembly 22 has a first electrode tab 221a and a second electrode tab 222a. The polarity of the first electrode tab 221a and the second electrode tab 222a are opposite. For example, when the first electrode tab 221a is a positive electrode tab, the second electrode tab 222a is a negative electrode tab. The first electrode tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal via a connecting member 23, and the second electrode tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal via another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive electrode tab via one connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab via another connecting member 23.

[0065] In the battery cell 20, the electrode assembly 22 can be provided as a single one or multiple ones according to actual use requirements, for example, Figure 3 As shown, four independent electrode assemblies 22 are provided in the battery cell 20 .

[0066] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is used to be activated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value.

[0067] The pressure relief mechanism 213 may be of various possible pressure relief structures, which are not limited in the present embodiment. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism configured to melt when the internal temperature of the battery cell 20 equipped with the pressure relief mechanism 213 reaches a threshold; and / or the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism configured to rupture when the internal pressure of the battery cell 20 equipped with the pressure relief mechanism 213 reaches a threshold.

[0068] It should be understood that the battery 10 in the embodiment of the present application includes a plurality of battery cells 20 that can be arranged and placed in any direction within the box 11. For example, Figure 3 Take the rectangular parallelepiped battery cell 20 as an example, Figure 2 As shown, multiple battery cells 20 can be arranged as follows Figure 3 The vertical direction shown is installed in the box body 11 so that the end caps 212 of the plurality of battery cells 20 after installation face the upper box body 111, and the bottom wall of the shell 211 of the battery cell 20 faces the lower box body 112. Figure 2 Different, you can also put multiple Figure 3 The battery cell 20 is shown to be disposed transversely in the box body 11 .

[0069] As described above, the electrode assembly 22 is composed of a positive electrode sheet, a negative electrode sheet, and a separator. Both the positive and negative electrode sheets are coated with an active material layer. During the electrode sheet manufacturing process, a key step is to coat the substrate with the active material on both sides and then roll-form the substrate to form the positive or negative electrode sheet.

[0070] Figure 4 The device 30 for processing a substrate according to an embodiment of the present application is shown. The substrate 40 is, for example, a substrate for a pole piece, used to manufacture the pole piece. The substrate 40 includes a first surface 41 and a second surface 42 perpendicular to its thickness direction. Figure 4 As shown, the apparatus 30 includes a first coating device 31 , a second coating device 32 , and a rolling device 33 .

[0071] The first coating device 31 is used to coat the first surface 41 with a material 50, which is used to form a first film 51 on the first surface 41. The second coating device 32 is used to coat the first roller 331 with a material 50, which is used to form a second film 52 on the roller surface of the first roller.

[0072] The rolling device 33 is arranged downstream of the first coating device 31 and the second coating device 32. The rolling device 33 includes a first pressing roller 331 and a second pressing roller 332 arranged opposite to each other. The first surface 41 is arranged toward the roller surface of the second pressing roller 332, and the second surface 42 of the substrate is arranged away from the roller surface of the second pressing roller 332.

[0073] The rolling device 33 is used to transfer the substrate 40 between the first pressing roller 331 and the second pressing roller 332, so that when the substrate 40 passes between the first pressing roller 331 and the second pressing roller 332, the first film material 51 is pressed to the first surface under the pressure between the first pressing roller 331 and the second pressing roller 332, and the second film material 52 is transferred from the roller surface of the first pressing roller 331 and pressed to the second surface 42.

[0074] like Figure 4 As shown, first, the first coating device 31 and the second coating device 32 apply material to the first surface 41 of the substrate 40 and the roller surface of the first pressing roller 331, respectively. This material is used to form a first film material 51 and a second film material 52 on the first surface 41 of the substrate 40 and the roller surface of the first pressing roller 331, respectively. Second, the first film material 51 and the second film material 52 are pressed onto the first surface 41 and the second surface 42, respectively, by the rolling device 33. In this application, the first film material 51 and the second film material 52 are simultaneously pressed onto both surfaces of the substrate 40 by the rolling device 33.

[0075] Specifically, the rolling device 33 includes a first pressing roller 331 and a second pressing roller 332 arranged side by side, and the substrate 40 is conveyed between the first pressing roller 331 and the second pressing roller 332, wherein the first surface 41 of the substrate 40 is arranged toward the roller surface of the second pressing roller 332, and the second surface 42 of the substrate 40 is arranged away from the roller surface of the second pressing roller 332, or in other words, the second surface 42 is arranged toward the roller surface of the first pressing roller 331. When the substrate 40 passes between the first pressing roller 331 and the second pressing roller 332, the first film material 51 on the first surface 41 of the substrate 40 is pressed to the first surface 41 under the pressure between the first pressing roller 331 and the second pressing roller 332, and the second film material 52 on the roller surface of the first pressing roller 331 is transferred to the second surface 42 of the substrate 40 due to the difference in bonding force between the roller surface 52 and the substrate 40 when the substrate 40 passes between the first pressing roller 331 and the second pressing roller 332, and is pressed to the second surface 42 of the substrate 40 under the pressure between the first pressing roller 331 and the second pressing roller 332. Since the first film material 51 and the second film material 52 are pressed onto the first surface 41 and the second surface 42 of the substrate 40 at the same time, the double-sided rolling of the substrate 40 is achieved. Therefore, there is no need for repeated winding and unwinding during the entire substrate processing process, which reduces the complexity of the equipment 30. In addition, since the force on the first surface 41 and the second surface 42 of the substrate 40 is uniform, this reduces problems such as cracking caused by uneven stress and improves the quality of the finished product.

[0076] In some embodiments, the roller pressing device 33 is used to transfer the substrate 40 between the first pressing roller 331 and the second pressing roller 332 via the second pressing roller 332 , thereby simplifying the roller system structure and making the structure of the device 30 more compact.

[0077] The larger the diameter of the first pressing roller 331 is, the more material can be covered by its roller surface. Therefore, in some implementations, the diameter of the first pressing roller 331 can be larger than the diameter of the second pressing roller 332 .

[0078] In some embodiments, the apparatus 30 further includes a first heating device 34 , which is configured to heat the material 50 to form a first film material 51 .

[0079] The first heating device 34 can be arranged between the first coating device 31 and the rolling device 33, so as to heat the material 50 coated on the first surface 41; or, the first heating device 34 can also be arranged inside the first coating device 31, for example, in the first feeding unit 311 of the first coating device 31, so that the first feeding unit 311 directly outputs the heated material 50. At this time, the first feeding unit 311 can also include a stirring element, etc.

[0080] The first heating device 34 can heat the material 50 by, for example, infrared heating or hot oil medium heating. In some embodiments, the first heating device 34 can include a plurality of heating tubes 341 for heating the material 50.

[0081] like Figure 4 As shown, when a substrate 40 passes through the first coating device 31, a material 50 is coated on its first surface 41. The material 50 may be, for example, a dry powder doped with adhesive particles. As the material 50 is conveyed from the first coating device 31 to the first heating device 34, the first heating device 34 heats the material 50 coated on the first surface 41 of the substrate 40, melting the adhesive particles doped in the material 50. This allows the dry powder in the material 50 to be bonded together by the adhesive particles, forming a flaky coating with poor fluidity, i.e., the first film material 51.

[0082] In some embodiments, the apparatus 30 further includes a second heating device 35 for heating the material 50 to form a second film material 52 .

[0083] The second heating device 35 is located on the periphery of the first pressing roller 331 and is used to heat the material 50 coated on the roller surface of the first pressing roller 331. The second heating device 35 can heat the material 50 using, for example, infrared heating or hot oil medium heating. In some embodiments, the second heating device 35 includes a plurality of heating tubes 351, which are arranged in an arc shape around the roller surface of the first pressing roller 331. When the plurality of heating tubes 351 are arranged in an arc shape around the roller surface of the first pressing roller, the roller surface of the first pressing roller 331 is evenly heated, thereby improving the uniformity of the formed first film material 51 and ensuring the consistency of the finished product.

[0084] like Figure 4 As shown, when the substrate 40 passes through the second coating device 32, the material 50 is coated on the roller surface of the first roller 331. As the first roller 331 rotates, the material 50 is conveyed to the second heating device 35. The second heating device 35 heats the material 50 coated on the roller surface of the first roller 331, melting the adhesive particles mixed in the material 50. This allows the dry powder in the material 50 to be bonded together by the adhesive particles, forming a flaky coating with poor fluidity, namely the second film material 52.

[0085] As can be seen, after passing through the first coating device 31, the material 50 is coated on the first surface 41 of the substrate 40. Next, the substrate 40 is conveyed to the first heating device 34. The material coated on the first surface 41 is heated by the first heating device 34 to form a first film 51 on the first surface 41. The first surface 41 of the substrate 40 is positioned toward the roller surface of the second pressing roller 332. When the substrate 40 passes through the second pressing roller 332 and arrives between the first pressing roller 331 and the second pressing roller 332, the first film 51 is pressed onto the first surface 41 under the pressure between the first pressing roller 331 and the second pressing roller 332. It can be understood that before the substrate 40 reaches the roller pressing device 33, the material 50 is merely applied or pre-pressed onto the first surface 41 of the substrate 40. Only after the substrate 40 passes through the roller pressing device 33 is the material 50 firmly pressed onto the first surface 41, thereby producing a finished product that meets quality requirements.

[0086] As for the second surface 42 of the substrate 40, after passing through the second coating device 32, the material 50 is coated on the roller surface of the first pressing roller 331, and under the heating of the second heating device 35, a second film material 52 is formed on the roller surface of the first pressing roller 331, and the second surface 42 of the substrate 40 is set toward the roller surface of the first pressing roller 331; then, as the first pressing roller 331 rotates, the second film material 52 on the roller surface of the first pressing roller 331 is conveyed to between the first pressing roller 331 and the second pressing roller 332. Under the pressure between the first pressing roller 331 and the second pressing roller 332, the second film material 52 is pressed onto the second surface 42 of the substrate 40. It can be understood that before the second film material 52 reaches between the first pressure roller 331 and the second pressure roller 332, the material 50 is only smeared or pre-pressed on the roller surface of the first pressure roller 331. After the second film material 52 passes between the first pressure roller 331 and the second pressure roller 332, due to the difference in adhesion between the roller surface and the substrate to the material 50, when the substrate 40 and the second film material 52 pass through the first pressure roller 331 and the second pressure roller 332 at the same time, the material 50 will be transferred from the roller surface of the first pressure roller 331 to the second surface 42 of the substrate 40, and under the pressure between the first pressure roller 331 and the second pressure roller 332, the second film material 52 is firmly pressed on the second surface 42, thereby obtaining a finished product that meets the quality requirements.

[0087] In some embodiments, as Figure 4 As shown, the first coating device 31 includes a first feeding unit 311, a first coating roller 312, and a second coating roller 313. The first feeding unit 311 includes a first drop opening 3113. The first coating roller 312 is disposed at the first drop opening 3113. The second coating roller 313 is disposed opposite the first coating roller 312 so that the material 50 fed from the first drop opening 3113 is coated on the first surface 41 of the substrate 40 when the substrate 40 passes between the first coating roller 312 and the second coating roller 313.

[0088] In this way, when the material 50 is transported from the first material outlet 3113 to the first surface 41 of the substrate 40, due to the pressure between the first coating roller 312 and the second coating roller 313, the material 50 will be evenly coated on the first surface 41 of the substrate 40, ensuring the uniformity of coating.

[0089] It should be understood that the second coating roller 313 can also be replaced with a flat plate, etc., to achieve coating of the substrate 40, and this application is not limited to this. However, compared to a flat plate, using the second coating roller 313 and positioning the second coating roller 313 opposite the first coating roller 312 can achieve symmetrical force on the substrate 40. Furthermore, using the second coating roller 313 provides a more flexible conveying path for the substrate 40.

[0090] like Figure 4 As shown, the first feeding unit 311 may include, for example, a first baffle 3111 and a first ultrasonic plate 3112. A first feeding opening 3113 is formed between the first ultrasonic plate 3112 and the first baffle 3111. The first ultrasonic plate 3112 is configured to generate ultrasonic vibrations to uniformly convey the material 50 through the first feeding opening 3113. Because the first ultrasonic plate 3112 generates ultrasonic vibrations, the amount of material 50 discharged can be controlled, ensuring uniform discharge of the material 50 from the first feeding opening 3113 and ensuring stable material delivery.

[0091] The material 50 can be stored in the accommodation space formed by the first baffle 3111 and the first ultrasonic plate 3112. For example, the diameter of the accommodation space toward the first blanking opening 3113 can be from large to small, so as to facilitate material discharge.

[0092] The end surface of the first ultrasonic plate 3112 facing the first blanking port 3113 can be an inclined surface, for example, an inclined surface with an angle of 45°. Since it is shaped like a blade, it can also be called a first ultrasonic knife 3112.

[0093] In some embodiments, as Figure 4 As shown, the second coating device 32 includes a second feeding unit 321 and a third coating roller 322. The second feeding unit 321 includes a second material dropout opening 3213. The third coating roller 322 is located at the second material dropout opening 3213 and is disposed opposite the first pressure roller 331. When the first pressure roller 331 and the third coating roller 322 rotate relative to each other, the material 50 fed from the second material dropout opening 3213 is coated on the roller surface of the first pressure roller 331.

[0094] In this way, when the material 50 is transported from the second blanking port 3213 to the roller surface of the first pressing roller 331, due to the pressure between the first pressing roller 331 and the third coating roller 322, the material 50 will be evenly coated on the roller surface of the first pressing roller 331, ensuring the uniformity of coating.

[0095] In fact, during the coating process, the first pressing roller 331 also acts as a coating roller, cooperating with the third coating roller 322 to coat the material 50 on the roller surface of the first pressing roller 331. In other words, when coating the roller surface of the first pressing roller 331, the first pressing roller 331 acts as a coating roller, and together with the third coating roller 322, smoothes the material 50 on the first surface 41 of the substrate 40. In the subsequent rolling process of the substrate 40, the first pressing roller 331 acts as a pressing roller, and together with the second pressing roller 332, rolls the substrate 40 on both sides.

[0096] It should be understood that in some embodiments, the pressure between the first coating roller 312 and the second coating roller 313, as well as the pressure between the third coating roller 322 and the first pressing roller 331, is less than the pressure between the first pressing roller 331 and the second pressing roller 332. Since the coating rollers are used to apply the material to the substrate surface, the required pressure is relatively low, i.e., light pressure, primarily to smooth the material. The pressing rollers, on the other hand, are used to transfer, press, or bond the film material to the substrate surface, requiring relatively high pressure, i.e., heavy pressure, thereby firmly forming the film material onto the substrate surface and producing a finished substrate, such as an electrode.

[0097] The embodiment of the present application does not limit the positional relationship between the third coating roller 322, the first pressing roller 331 and the second pressing roller 332. Figure 4 As shown, the centers of the third coating roller 322, the first pressing roller 331 and the second pressing roller 332 can be located on a straight line, which is convenient for arrangement and can fully utilize the roller surface of the first pressing roller 331, so that a larger area on the roller surface, such as half of the area, can be used to carry materials.

[0098] like Figure 4 As shown, the second feeding unit 321 may include, for example, a second baffle 3211 and a second ultrasonic plate 3212. A second feeding port 3213 is formed between the second baffle 3211 and the second ultrasonic plate 3212. The second ultrasonic plate 3212 is configured to generate ultrasonic vibrations to uniformly transport material through the second feeding port 3213. Because the second ultrasonic plate 3212 generates ultrasonic vibrations, the amount of material discharged can be controlled, ensuring uniform delivery of the material 50 from the second feeding port 3213 and ensuring stable material delivery.

[0099] The material 50 can be stored in the accommodation space formed by the second baffle 3211 and the second ultrasonic plate 3212. For example, the diameter of the accommodation space decreases from large to small along the direction toward the second blanking port 3213, thereby facilitating the blanking.

[0100] The end surface of the second ultrasonic plate 3212 facing the second blanking port 3213 can be an inclined surface, for example, an inclined surface with an angle of 45°. Since it is shaped like a blade, it can also be called a second ultrasonic knife 3212.

[0101] In some embodiments, as Figure 5 As shown, the apparatus 30 may also include other rollers to form a complete roller system.

[0102] For example, Figure 5 As shown, the device 30 further includes a unwinding roller 61 and a winding roller 62 , wherein the unwinding roller 61 is used to release the untreated substrate 40 , and the winding roller 62 is used to wind up the substrate 40 processed by the rolling device 33 .

[0103] For example, Figure 5 As shown, the apparatus 30 further includes a traction roller 70 , which is disposed between the first coating device 31 and the unwinding roller 61 and is configured to provide traction for transporting the substrate 40 .

[0104] For example, Figure 5 As shown, the apparatus 30 further includes a tension roller 80, which is disposed between the first coating device 31 and the unwinding roller 61 and is used to detect the tension of the substrate 40 during transport. This tension can be used to adjust the rotation speed of at least one of the unwinding roller 61, the winding roller 62, and the pulling roller 70.

[0105] The tension of the substrate 40 during the transmission process is detected by the tension roller 80. Based on the tension feedback from the tension roller 80, the parameters such as the rotation speed of the unwinding roller 61, the winding roller 62, the traction roller 70 and other rollers can be adjusted, so that the substrate 40 is smoothly transmitted, ensuring the stability of the coating and rolling process of the substrate 40 and improving the quality of the finished product.

[0106] In some embodiments, as Figure 5 As shown, the apparatus 30 further includes at least one roller 90 disposed between the unwinding roller 61 and the first coating device 31, and / or between the winding roller 62 and the roller pressing device 33. The roller 90 is used to change the conveying direction of the substrate 40. The position of the roller 90 can be set according to the requirements of the roller system, thereby optimizing the structure of the apparatus 30 by changing the conveying direction of the substrate 40.

[0107] This application does not limit the number and position of the rollers 90 . Figure 5 It is taken as an example that two rollers 90 are provided between the unwinding roller 61 and the first coating device 31 , and two rollers 90 are provided between the winding roller 62 and the roller pressing device 33 .

[0108] The above describes the substrate processing apparatus 30 according to the embodiment of the present application. The following describes the substrate processing method 100 according to the embodiment of the present application, wherein the parts not described in detail can be referred to the above embodiments.

[0109] Figure 6 1 shows a method 100 for processing a substrate according to an embodiment of the present application. The substrate 40 includes a first surface and a second surface perpendicular to its thickness direction. Figure 6 As shown, the method 100 includes some or all of the following steps.

[0110] In step 110 , a material 50 is coated on the first surface 41 by the first coating device 31 . The material 50 is used to form a first film 51 on the first surface 41 .

[0111] In step 120 , the second coating device 32 coats the material 50 on the roller surface of the first pressing roller 331 . The material 50 is used to form a second film material 52 on the roller surface of the first pressing roller 331 .

[0112] In step 130, the substrate 40 is subjected to a rolling process by the rolling device 33. The rolling device 33 includes a first pressing roller 331 and a second pressing roller 332 arranged opposite to each other, with the first surface 41 facing the roller surface of the second pressing roller 332, and the second surface 42 of the substrate 40 facing away from the roller surface of the second pressing roller 332. The rolling device 33 is used to transfer the substrate 40 between the first pressing roller 331 and the second pressing roller 332. When the substrate 40 passes between the first pressing roller 331 and the second pressing roller 332, the first film 51 is pressed against the first surface 41, and the second film 52 is transferred from the roller surface of the first pressing roller 331 and pressed against the second surface 42.

[0113] According to method 100, first, the first surface 41 of the substrate 40 and the roller surface of the first pressing roller 331 are coated by the first coating device 31 and the second coating device 32, thereby forming a first film material 51 and a second film material 52 on the first surface 41 of the substrate 40 and the roller surface of the first pressing roller 331, respectively. Then, the first film material 51 and the second film material 52 are pressed onto the first surface 41 and the second surface 42, respectively, by the rolling device 33. Specifically, the rolling device 33 includes a first pressing roller 331 and a second pressing roller 332 arranged side by side. The substrate 40 is conveyed between the first pressing roller 331 and the second pressing roller 332, wherein the first surface 41 of the substrate 40 is arranged toward the roller surface of the second pressing roller 332, and the second surface 42 of the substrate 40 is arranged away from the roller surface of the second pressing roller 332. When the substrate 40 passes between the first pressing roller 331 and the second pressing roller 332, the first film material 51 previously coated on the first surface 41 of the substrate 40 is pressed to the first surface 41 under the pressure between the first pressing roller 331 and the second pressing roller 332, and the second film material 52 previously coated on the roller surface of the first pressing roller 331 is transferred to the second surface 42 of the substrate 40 when the substrate 40 passes between the first pressing roller 331 and the second pressing roller 332 due to the difference in adhesion between the roller surface and the substrate 40 to the film material. It is pressed to the second surface 42 of the substrate 40 under the pressure between the first pressing roller 331 and the second pressing roller 332. Since the first film material 51 and the second film material 52 are pressed onto the first surface 41 and the second surface 42 of the substrate 40 at the same time, there is no need to repeatedly rewind and unwind during the entire substrate processing process, which reduces the complexity of the equipment 30. In addition, the force on the first surface 41 and the second surface 42 of the substrate 40 is uniform, which reduces problems such as cracking caused by uneven stress and improves the quality of the finished product.

[0114] In some embodiments, the roller pressing device 33 is configured to transfer the substrate 40 between the first pressing roller 331 and the second pressing roller 332 via the second pressing roller 332 .

[0115] In some embodiments, the method 100 further includes: heating the material 50 coated on the first surface 41 by a first heating device 34 to form a first film material 51 .

[0116] In some embodiments, the method 100 further includes: heating the material 50 coated on the roller surface of the first pressing roller 331 by a second heating device 35 to form a second film material 52 .

[0117] In some embodiments, the second heating device 35 includes a plurality of heating tubes 351 arranged in an arc shape around the roller surface of the first pressing roller 331 .

[0118] While this application has been described with reference to preferred embodiments, various modifications may be made thereto and equivalent components may be substituted without departing from the scope of this application. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. This application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A device for processing a substrate, wherein the substrate comprises a first surface and a second surface perpendicular to the thickness direction thereof, characterized in that: The device comprises: A first coating device is used to coat a material on the first surface, wherein the material is used to form a first film material on the first surface; a second coating device, configured to coat the material on the roller surface of the first pressing roller, wherein the material is used to form a second film material on the roller surface of the first pressing roller; A rolling device is arranged downstream of the first coating device and the second coating device, and the rolling device includes the first pressing roller and the second pressing roller arranged opposite to each other, the first surface is arranged toward the roller surface of the second pressing roller, and the second surface is arranged away from the roller surface of the second pressing roller. The rolling device is used to transfer the substrate between the first pressing roller and the second pressing roller, so that when the substrate passes between the first pressing roller and the second pressing roller, the first film material is pressed to the first surface under the pressure between the first pressing roller and the second pressing roller, and the second film material is transferred from the roller surface of the first pressing roller and pressed to the second surface.

2. The device according to claim 1, characterized in that The roller pressing device is used to transfer the substrate to between the first pressing roller and the second pressing roller through the second pressing roller.

3. The device according to claim 1 or 2, characterized in that The device further comprises: The first heating device is used to heat the material to form the first film material.

4. The device according to claim 1 or 2, characterized in that The device further comprises: The second heating device is used to heat the material to form the second film material.

5. The device according to claim 4, characterized in that The second heating device comprises: A plurality of heating tubes are arranged in an arc shape around the roller surface of the first pressing roller.

6. The device according to claim 1 or 2, characterized in that The first coating device comprises: A first feeding unit includes a first feeding port; A first coating roller is arranged at the first blanking port; The second coating roller is arranged opposite to the first coating roller to coat the material delivered from the first material outlet on the first surface when the substrate passes between the first coating roller and the second coating roller.

7. The device according to claim 6, characterized in that The first feeding unit comprises: First baffle; The first ultrasonic plate forms the first material drop opening with the first baffle, and the first ultrasonic plate is used to generate ultrasonic vibration so that the first material drop opening can evenly transport the material.

8. The device according to claim 1 or 2, characterized in that The second coating device comprises: A second feeding unit includes a second feeding port; The third coating roller is located at the second blanking port and is arranged opposite to the first pressing roller so that the material conveyed from the second blanking port is coated on the roller surface of the first pressing roller when the first pressing roller and the third coating roller rotate relative to each other.

9. The device according to claim 8, characterized in that The second feeding unit comprises: a second baffle; The second ultrasonic plate forms the second material drop opening with the second baffle, and the second ultrasonic plate is used to generate ultrasonic vibration so that the second material drop opening can evenly transport the material.

10. The device according to claim 1 or 2, characterized in that The device further comprises: a pay-off roller for releasing the untreated substrate; A winding roller, used for winding up the substrate after being processed by the rolling device; a traction roller, disposed between the first coating device and the unwinding roller, for providing traction for conveying the substrate; A tension roller is provided between the first coating device and the unwinding roller, and is used to detect the tension of the substrate during the conveying process. The tension is used to adjust the rotation speed of at least one of the unwinding roller, the winding roller, and the traction roller.

11. A method for treating a substrate, characterized in that: The substrate includes a first surface and a second surface perpendicular to the thickness direction of the substrate, and the method includes: coating the first surface with a material by a first coating device, wherein the material is used to form a first film material on the first surface; The material is coated on the roller surface of the first pressing roller by a second coating device, and the material is used to form a second film material on the roller surface of the first pressing roller; The substrate is subjected to a rolling process by a rolling device, wherein the rolling device includes the first pressing roller and the second pressing roller arranged opposite to each other, the first surface is arranged toward the roller surface of the second pressing roller, and the second surface is arranged away from the roller surface of the second pressing roller, and the rolling device is used to transfer the substrate between the first pressing roller and the second pressing roller, so that when the substrate passes between the first pressing roller and the second pressing roller, the first film material is pressed to the first surface under the pressure between the first pressing roller and the second pressing roller, and the second film material is transferred from the roller surface of the first pressing roller and pressed to the second surface.

12. The method according to claim 11, characterized in that The roller pressing device is used to transfer the substrate to between the first pressing roller and the second pressing roller through the second pressing roller.

13. The method according to claim 11 or 12, characterized in that The method further comprises: The material coated on the first surface is heated by a first heating device to form the first film material.

14. The method according to claim 11 or 12, characterized in that The method further comprises: The material coated on the roller surface of the first pressing roller is heated by a second heating device to form the second film material.

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