Device for preparing current collector, current collector and battery device

Abstract

The embodiment of the utility model provides a device for preparing a current collector, the current collector and a battery device. The device comprises an unwinding roller, a first feeding device, a first transfer roller and a first preheating roller. The unwinding roller is used for providing a base film, and the base film comprises a first surface. The first feeding device is used for providing a first transfer printing film, the first transfer printing film comprises a first bottom film and a first metal layer, and the first metal layer is arranged on the side, facing the first surface, of the first bottom film. The first transfer roller is used for transferring the first metal layer to the first surface to form the current collector. The first preheating roller is arranged between the unwinding roller and the first transfer roller, and the first preheating roller is used for heating the first transfer printing film, so that the reliability of the battery device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, and more particularly, to an apparatus for preparing a current collector, a current collector, and a battery device. BACKGROUND

[0002] The current collector is an important component of a battery monomer, which plays a role of carrying active material and collecting and transmitting current generated by the electrode. The reliability of the current collector has a great influence on the overall reliability of the battery monomer. However, the current preparation process of the current collector is difficult to balance the reliability of the current collector in the case of improving the production capacity, and the reliability of the produced current collector is affected, thereby affecting the reliability of the battery device.

[0003] Therefore, how to improve the reliability of the battery device becomes a problem to be solved. Invention content

[0004] The embodiments of the present application provide an apparatus for preparing a current collector, a current collector, and a battery device, which can improve the reliability of the battery device.

[0005] In a first aspect, an apparatus for preparing a current collector is provided, which comprises a unwinding roller, a first feeding device, a first transfer roller and a first preheating roller. The unwinding roller is used to provide a base film, which comprises a first surface. The first feeding device is used to provide a first transfer film, which comprises a first base film and a first metal layer, and the first metal layer is arranged on a side of the first base film facing the first surface. The first transfer roller is used to transfer the first metal layer to the first surface to form the current collector. The first preheating roller is arranged between the unwinding roller and the first transfer roller, and is used to heat the first transfer film; wherein the first transfer roller is further used to heat the first transfer film.

[0006] In the technical scheme provided by the embodiments of the present application, the unwinding roller provides the base film, the first feeding device provides the first transfer film, and the first transfer film is preheated by the first preheating roller before transfer, so that the first transfer film has been raised to a certain temperature before transfer. When passing through the first transfer roller, the first transfer film is more likely to reach the predetermined temperature, so that the first transfer film can transfer the first metal layer to the base film at a faster speed and with stronger adhesion, thereby improving the reliability of the prepared current collector. Therefore, the reliability of the battery device can be improved.

[0007] In some embodiments, the diameter of the first transfer roller is greater than the diameter of the first preheating roller.

[0008] In the technical scheme provided in the embodiments of the present application, the roll diameter of the first transfer roller is larger than the roll diameter of the first preheating roller, the contact area of the current collector with the first transfer roller is increased, so that the adhesion between the first metal layer of the current collector and the base film can be improved, the reliability of the current collector can be improved, and the efficiency of producing the current collector can be improved.

[0009] In some embodiments, the device further comprises a coating roller arranged between the unwinding roller and the first preheating roller, the coating roller being configured to apply the adhesive to the first surface or the surface of the first metal layer.

[0010] In some embodiments, the base film further comprises a second surface opposite to the first surface, and the device further comprises a steel roller arranged opposite to the coating roller, the steel roller and the coating roller being configured to allow the base film to pass therebetween; when the base film passes, the first surface abuts against the surface of the coating roller, and the second surface abuts against the surface of the steel roller.

[0011] In the technical scheme provided in the embodiments of the present application, the steel roller and the coating roller are arranged opposite to each other, and the steel roller and the coating roller cooperate to apply the adhesive to the first surface, so that the adhesive can be more uniformly distributed on the first surface, thereby improving the uniformity of the adhesion between the first metal and the base film, and improving the reliability of the current collector.

[0012] In some embodiments, the device further comprises a first electric generator arranged between the unwinding roller and the first preheating roller, the first electric generator being configured to discharge electricity to the first surface.

[0013] In the technical scheme provided in the embodiments of the present application, the first electric generator discharges electricity to the first surface, so that the molecules of the first surface of the base film are polarized and ionized, thereby increasing the surface energy. At the same time, the active groups of the first surface are increased, thereby improving the adhesive adhesion of the first surface of the base film and the bonding strength between the base film and the first metal layer. Thus, the reliability of the current collector can be improved.

[0014] In some embodiments, the discharge power P1 of the first electric generator satisfies 700W≤P1≤2000W.

[0015] In the technical scheme provided in the embodiments of the present application, the discharge power P1 of the first electric generator satisfies 700W≤P1≤2000W. On the one hand, the discharge power of the first electric generator is not too high, thereby reducing the possibility of damage to the base film, and on the other hand, the discharge power of the first electric generator is not too low, thereby playing a good polarization and ionization effect on the first surface.

[0016] In some embodiments, the device further comprises a first winding roller configured to collect the current collector, and a second winding roller configured to collect the first base film.

[0017] In some embodiments, the base film further comprises a second surface opposite to the first surface, and the device further comprises: a second feeding device configured to provide a second transfer film, the second transfer film comprising a second base film and a second metal layer, the second metal layer being disposed on a side of the second base film facing the second surface; and a second transfer roller configured to transfer the second metal layer to the second surface.

[0018] In the technical scheme provided by the embodiments of the present application, the first transfer roller and the second transfer roller are respectively arranged on two sides of the base film, and the first feeding device and the second feeding device are respectively arranged to provide the metal layers to the first surface and the second surface of the base film, so that the efficiency of producing the current collector can be improved. The first transfer roller and the second transfer roller on the two sides of the base film can cooperate with each other to improve the pressure applied by the first transfer roller and the second transfer roller to the current collector, so that the adhesion between the metal layers and the base film can be further improved. Thus, the reliability of the current collector can be improved.

[0019] In some embodiments, the device further comprises: a second preheating roller arranged between the second feeding device and the second transfer roller, the second preheating roller being configured to heat the second transfer film.

[0020] In the technical scheme provided by the embodiments of the present application, the first transfer film and the second transfer film are heated by the first preheating roller and the second preheating roller respectively, so that the consistency of the adhesion between the first metal layer and the second metal layer and the base film can be improved, and thus the reliability of the current collector can be improved.

[0021] In some embodiments, the device further comprises: a second electric generator arranged between the unwinding roller and the first preheating roller, the second electric generator being configured to discharge electricity to the second surface.

[0022] In the technical scheme provided by the embodiments of the present application, the second electric generator discharges electricity to the second surface, so that the molecules of the second surface of the base film are polarized and ionized, and thus the surface energy is increased. At the same time, the active groups on the second surface are increased, and thus the adhesion of the adhesive on the second surface of the base film can be improved, and the bonding strength between the base film and the second metal layer can be improved. Further, since the first surface and the second surface are both subjected to electric treatment, the consistency of the adhesion between the base film and the metal layers on both sides can be improved. Thus, the reliability of the current collector can be improved.

[0023] In some embodiments, the working temperature t1 of the surface of the first preheating roller satisfies: 100℃≤t1≤170℃.

[0024] In the technical scheme provided by the embodiment of the present application, the working temperature t1 of the surface of the first preheating roller satisfies 100℃≤t1≤170℃. On the one hand, the working temperature of the surface of the first preheating roller can satisfy the temperature at which the binder softens, thereby improving the bonding performance of the binder. On the other hand, the working temperature of the surface of the first preheating roller is not too high, thereby reducing the possibility that the substrate film shrinks due to high temperature. Thus, the product quality of the current collector can be improved.

[0025] In some embodiments, the working temperature t2 of the surface of the first transfer roller satisfies 120℃≤t2≤200℃.

[0026] In the technical scheme provided by the embodiment of the present application, the working temperature t2 of the surface of the first transfer roller satisfies 120℃≤t2≤200℃. On the one hand, the working temperature of the surface of the first transfer roller can satisfy the temperature at which the binder is converted into a semi-liquid, thereby enabling the binder on the first surface to better bond the first metal layer. On the other hand, the working temperature of the surface of the first transfer roller is not too high, thereby reducing the possibility that the substrate film shrinks due to high temperature. Thus, the product quality of the current collector can be improved.

[0027] In some embodiments, the thickness d1 of the first metal layer satisfies 0.5μm≤d1≤2μm.

[0028] In the technical scheme provided by the embodiment of the present application, the current collector is preheated by the first preheating roller, which can increase the temperature of the binder when the first metal layer is transferred to the substrate film, thereby reducing the possibility that the binder is insufficiently heated and improving the thickness of the bonded first metal layer. Thus, the compatibility of the current collector production process with the thickness of the first metal layer in the produced current collector can be improved, and the device for preparing the current collector can be compatible with the current collector preparation process in which the thickness d1 of the first metal layer satisfies 0.5μm≤d1≤2μm.

[0029] In some embodiments, under the working condition, the linear speed v1 of the surface of the unwinding roller satisfies 30m / min≤v1≤160m / min.

[0030] In the technical scheme provided by the embodiment of the present application, the current collector is preheated by the first preheating roller, which can increase the temperature of the binder when the first metal layer is transferred to the substrate film, thereby reducing the possibility that the binder is insufficiently heated due to a too short heating time and improving the linear speed of the surface of the unwinding roller. Thus, the efficiency of producing the current collector can be improved, and the linear speed v1 of the surface of the unwinding roller can satisfy 30m / min≤v1≤160m / min.

[0031] In a second aspect, a current collector is provided, which is prepared by using the device according to any one of the first aspect.

[0032] Thirdly, a battery device is provided, including a current collector as described in the second aspect.

[0033] In some embodiments, the electrical device is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0034] Figure 1 A schematic diagram of the structure of a vehicle according to one embodiment of this application is shown;

[0035] Figure 2 A partial structural schematic diagram of the battery device according to an embodiment of this application is shown;

[0036] Figure 3 An exploded view of a battery cell provided in one embodiment of this application is shown;

[0037] Figure 4 A schematic diagram of an apparatus for preparing a current collector according to a certain embodiment of this application is shown;

[0038] Figure 5 This application shows Figure 4 An enlarged schematic diagram of part A of the apparatus for preparing current collectors provided in the image;

[0039] Figure 6 This application shows Figure 4 An enlarged schematic diagram of part B of the apparatus for preparing current collectors provided in the image;

[0040] Figure 7 A schematic diagram of an apparatus for preparing a current collector according to yet another embodiment of this application is shown;

[0041] Figure 8 This illustration shows another possible schematic diagram of an apparatus for preparing a current collector according to yet another embodiment of this application;

[0042] Figure 9 A schematic diagram of an apparatus for preparing a current collector according to another embodiment of this application is shown;

[0043] Figure 10 A schematic diagram of an apparatus for preparing a current collector according to another embodiment of this application is shown;

[0044] Figure 11 This application shows Figure 10 An enlarged schematic diagram of part D in the device for preparing current collectors provided in the image;

[0045] Figure 12 This application shows Figure 10 An enlarged schematic diagram of part C in the apparatus for preparing current collectors provided in the image;

[0046] Figure 13Other possible schematic diagrams of the apparatus for manufacturing the current collector provided by another embodiment of the present application are shown.

[0047] In the drawings, the drawings are not drawn according to the actual proportion.

[0048] Reference signs:

[0049] 1 - vehicle; 10 - battery device; 20 - battery cell; 21 - housing; 211 - case; 212 - end cover; 25 - electrode assembly; 30 - controller; 40 - motor; 11 - box; 111 - first box part; 112 - second box part; 310 - unwinding roller; 321 - first feeding device; 322 - second feeding device; 331 - first transfer roller; 332 - second transfer roller; 341 - first preheating roller; 342 - second preheating roller; 350 - first winding roller; 361 - second winding roller; 362 - third winding roller; 370 - coating roller; 380 - steel roller; 391 - first electric generator; 392 - second electric generator; 400 - current collector; 410 - base film; 421 - first transfer film; 422 - second transfer film; 4211 - first base film; 4212 - first metal layer; 4221 - second base film; 4222 - second metal layer. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0052] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of other embodiments. It is expressly understood that the embodiments described in this application can be combined with each other in their various permutations and combinations.

[0053] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0054] The term "and / or" in this application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0055] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0056] "Multiple" appearing in this application means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0057] Unless otherwise specified, all embodiments and optional embodiments of the application can be combined with each other to form new technical solutions.

[0058] In the embodiments of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to use.

[0059] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the application are not limited thereto.

[0060] A battery cell generally includes an electrode assembly. The electrode assembly includes a cathode, an anode, and a separator disposed between the cathode and the anode. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are intercalated and deintercalated between the cathode and the anode. The separator, which is disposed between the cathode and the anode, can function to prevent short circuiting of the cathode and the anode while allowing the active ions to pass through.

[0061] In some embodiments, the cathode can be a cathode sheet, which can include a cathode current collector and a cathode active material disposed on at least one surface of the cathode current collector.

[0062] As an example, the cathode current collector has two opposing surfaces in the thickness direction of itself, and the cathode active material is disposed on either one or both of the two opposing surfaces of the cathode current collector.

[0063] As an example, the cathode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0064] In some embodiments, the anode can be an anode sheet, which can include an anode current collector.

[0065] As an example, the anode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0066] As an example, the anode sheet can include an anode current collector and an anode active material disposed on at least one surface of the anode current collector.

[0067] A battery device referred to in embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0068] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells.

[0069] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells by a cable tie.

[0070] In some embodiments, the battery device can be a battery pack, which includes a case and one or more battery cell assemblies, the battery cell assemblies are accommodated in the case.

[0071] As an example, the battery cell assembly can be a battery module, which is accommodated in the case by fixing the battery module in the case.

[0072] As an example, the battery cell assembly can also be accommodated in the case by fixing a plurality of battery cells directly in the case.

[0073] As an example, the case can include a first case and a second case. The first case and the second case are buckled so that the inside of the case forms a closed space to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0074] As an example, the case can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that the inside of the case forms a closed space to accommodate the battery cell assembly.

[0075] In some embodiments, the case can be part of the chassis structure of the vehicle. For example, part of the case can be at least part of the floor of the vehicle, or part of the case can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0076] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes airplanes, rockets, space shuttles and spaceships, etc.

[0077] The embodiments of the present application provide a kind of energy storage device, including one or more battery clusters (Battery Cluster) to improve the voltage and capacity of energy storage device. The battery cluster can include a plurality of battery devices, a plurality of battery devices are connected in series by busbar component to improve the voltage of energy storage device. When the energy storage device includes a plurality of battery clusters, a plurality of battery clusters are connected in parallel to improve the capacity of energy storage device.

[0078] The energy storage device can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electric energy as needed and output the electric energy at an appropriate time. For example, the energy storage device can store electric energy during a low electricity consumption period, and provide electric energy for related users or electric devices during a high electricity consumption period. The energy storage system provided in the embodiments of the present application can be any power system that needs to use an energy storage device.

[0079] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0080] In some embodiments, the energy storage device can include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0081] At present, from the development of market situation, the application of power batteries is more and more extensive. The power batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0082] The current collector is an important component of the battery monomer, which plays a role in bearing active material and collecting and transmitting the current generated by the electrode. The reliability of the current collector has a great influence on the overall reliability of the battery monomer. However, the current preparation process of the current collector is difficult to balance the reliability of the current collector in the case of improving the production capacity, and the reliability of the produced current collector is affected, thereby affecting the reliability of the battery device.

[0083] Therefore, how to improve the reliability of the battery device becomes a problem to be solved.

[0084] The embodiments of the present application provide a device for preparing a current collector, which comprises a unwinding roller, a first feeding device, a first transfer roller and a first preheating roller. The unwinding roller is used to provide a base film, and the base film comprises a first surface. The first feeding device is used to provide a first transfer film, and the first transfer film comprises a first bottom film and a first metal layer, and the first metal layer is arranged on the side of the first bottom film facing the first surface. The first transfer roller is used to transfer the first metal layer to the first surface to form the current collector. The first preheating roller is arranged between the unwinding roller and the first transfer roller, and is used to heat the first transfer film; wherein the first transfer roller is also used to further heat the first transfer film.

[0085] In the technical scheme provided in the embodiments of the present application, the unwinding roller provides the base film, the first feeding device provides the first transfer film, and the first transfer film is preheated by the first preheating roller before being transferred, so that the first transfer film is raised to a certain temperature before being transferred, and the first transfer film is more likely to reach a predetermined temperature at the first transfer roller, so that the first transfer film can transfer the first metal layer to the base film at a faster speed and with stronger adhesion, thereby improving the reliability of the prepared current collector. Therefore, the reliability of the battery device can be improved.

[0086] The technical schemes described in the embodiments of the present application are applicable to various electric devices using battery devices.

[0087] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above electric devices.

[0088] The following embodiments take the vehicle as an example for convenient description.

[0089] For example, as shown in FIG. 1, Figure 1 Figure 1 FIG. 1 shows a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The vehicle 1 can be internally provided with a motor 40, a controller 30, and a battery device 10. The controller 30 is used to control the power supply of the battery device 10 to the motor 40. For example, the battery device 10 can be arranged at the bottom, the front, or the rear of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1, for example, the battery device 10 can be used as an operating power source of the vehicle 1, and is used for the circuit system of the vehicle 1, for example, is used for the working power demand of the vehicle 1 during starting, navigation, and running. In another embodiment of the present application, the battery device 10 can not only be used as an operating power source of the vehicle 1, but also can be used as a driving power source of the vehicle 1, to replace or partially replace the fuel or natural gas to provide driving power for the vehicle 1.

[0090] Figure 2 ​A partial structural schematic diagram of the battery device 10 of the embodiments of the present application is shown.

[0091] As shown in Figure 2 , the battery device 10 of the embodiments of the present application can include a battery cell assembly, which can include one or more battery cells 20 to meet different power requirements. The shape of the battery cell 20 of the embodiments of the present application can be set according to actual application. For example, the battery cell 20 can be a square cell as shown in Figure 2 , or can also be other shapes different from Figure 2 , and the embodiments of the present application are not limited thereto.

[0092] It should be understood that, as shown in Figure 2 , the battery device 10 of the embodiments of the present application can also include a box 11, which can be used to accommodate the battery cell assembly, which can include one or more battery cells 20. The box 11 of the embodiments of the present application is a hollow structure, and a plurality of battery cells 20 are accommodated in the box 11. The box 11 can include multiple parts, for example Figure 2 , the box 11 can include two parts, which are referred to as the first box part 111 and the second box part 112, respectively. These two parts are only illustrative and should not constitute an improper limitation on the present application, and in other embodiments, these two parts can also have other names. The first box part 111 and the second box part 112 are buckled together. The shape of the first box part 111 and the second box part 112 can be determined according to the shape of the components accommodated inside, for example, according to the shape of the combination of the plurality of battery cells 20 accommodated inside, at least one of the first box part 111 and the second box part 112 has an opening. For example, as shown in Figure 2 , the first box part 111 and the second box part 112 can both be hollow cuboids with one face as an opening face, the opening of the first box part 111 and the opening of the second box part 112 are oppositely arranged, and the first box part 111 and the second box part 112 are buckled to each other to form a box 11 with a closed cavity, which can be used to accommodate a plurality of battery cells 20. A plurality of battery cells 20 are placed in the box 11 formed after the buckling of the first box part 111 and the second box part 112 after being combined in parallel or in series or in a hybrid combination. In some embodiments, the box 11 can also include three parts, for example, including the first box part 111, the second box part 112 and the frame.

[0093] For another example, different from Figure 2As shown, only one of the first box part 111 and the second box part 112 can be a hollow cuboid with an opening, and the other can be a plate to cover the opening. For example, the second box part 112 is a hollow cuboid with an opening, and the first box part 111 is a plate. The first box part 111 covers the opening of the second box part 112 to form a box 11 with a closed cavity, which can be used to accommodate a plurality of battery cells 20.

[0094] The battery device 10 can also be integrated into a power consuming device. For example, the box 11 of the battery device 10 can be part of the power consuming device. The power consuming device can be a vehicle 1. The chassis of the vehicle 1 can be part of the box 11 of the battery device 10. The chassis can be provided with an accommodation cavity. The inner wall of the accommodation cavity can be used as other walls of the box 11 to accommodate the battery cells 20.

[0095] Some components of the battery device 10 are schematically shown in the figures. However, the battery device 10 can also include other components. For example, the battery device 10 can also include a partition to separate a part of the space in the battery device 10.

[0096] The battery device 10 can also be provided with a thermal management mechanism. The thermal management mechanism can provide thermal management for the battery cells 20 in the form of a cooling plate. The battery cells 20 can also be partially or entirely immersed in a thermal management medium. The thermal management mechanism can provide thermal management for the battery cells 20 through the thermal management medium.

[0097] By way of example and not limitation, a possible application scenario of the current collector 400 is given below. For example, the current collector 400 can be used as a positive electrode current collector or a negative electrode current collector of the battery cell 20.

[0098] Figure 3 An exploded view of the battery cell 20 is shown.

[0099] As Figure 3 As shown, in some embodiments, the battery cell 20 can include a shell 21, which can include a shell body 211 and an end cover 212. The shell body 211 can be a steel shell, an aluminum shell, a plastic shell (such as a polypropylene shell), a composite metal shell (such as a copper-aluminum composite shell 21), or an aluminum-plastic film, etc. In some embodiments, the shell body 211 is provided with an opening, and the end cover 212 is covered on the opening. The end cover 212 and the shell body 211 can form a sealed structure for packaging the electrode assembly 25 and other components such as electrolyte.

[0100] As an example, the battery cell 20 can be a cylindrical battery cell 20, a prismatic battery cell 20, or a battery cell 20 of other shapes, including a square battery cell 20, a blade battery cell 20, a multi-prismatic battery cell, such as a hexagonal battery cell, and the like, without particular limitation.

[0101] The housing 211 can be provided with one or more openings. The end cap 212 can also be provided with one or more openings. The electrode assembly 25 includes a positive electrode tab, a negative electrode tab, and a separator disposed between the negative electrode tab and the positive electrode tab. During charging and discharging of the battery cell 20, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode tab and the negative electrode tab. The separator disposed between the positive electrode tab and the negative electrode tab can function to prevent short-circuiting of the positive and negative electrodes while allowing the active ions to pass through.

[0102] In some embodiments, the positive electrode tab can include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0103] As an example, the positive current collector has two surfaces opposite in the thickness direction thereof, and the positive active material is disposed on either one or both of the two opposite surfaces of the positive current collector.

[0104] As an example, the positive current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector 400. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, and the like, can be employed. The composite current collector 400 can include a polymer material base layer and a metal layer. The composite current collector 400 can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0105] In some embodiments, the negative electrode tab can include a negative current collector.

[0106] As an example, the negative current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector 400. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, and the like, can be employed. The composite current collector 400 can include a polymer material base layer and a metal layer. The composite current collector 400 can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0107] As an example, the negative electrode tab can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0108] As an example, the negative electrode current collector has two surfaces opposite in a thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two surfaces of the negative electrode current collector.

[0109] As an example, the negative electrode active material can be a negative electrode active material for a battery cell 20 known in the art.

[0110] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0111] The following will be described in conjunction with Figures 4 to 6 An apparatus for preparing a current collector 400 according to an embodiment of the present application is described.

[0112] Figure 4 A schematic diagram of the apparatus for preparing a current collector 400 according to an embodiment of the present application is shown; Figure 5 An enlarged schematic diagram of part A of the apparatus for preparing a current collector 400 according to an embodiment of the present application is shown; Figure 4 An enlarged schematic diagram of part B of the apparatus for preparing a current collector 400 according to an embodiment of the present application is shown. Figure 6 An enlarged schematic diagram of part B of the apparatus for preparing a current collector 400 according to an embodiment of the present application is shown. Figure 4 An enlarged schematic diagram of part B of the apparatus for preparing a current collector 400 according to an embodiment of the present application is shown.

[0113] An apparatus for preparing a current collector 400 according to an embodiment of the present application is provided, which includes an unwinding roller 310, a first feeding device 321, a first transfer roller 331, and a first preheating roller 341. The unwinding roller 310 is configured to provide a base film 410 including a first surface. The first feeding device 321 is configured to provide a first transfer film 421 including a first base film 4211 and a first metal layer 4212 disposed on a side of the first base film 4211 facing the first surface. The first transfer roller 331 is configured to transfer the first metal layer 4212 to the first surface to form the current collector 400. The first preheating roller 341 is disposed between the unwinding roller 310 and the first transfer roller 331, and is configured to heat the first transfer film 421.

[0114] The current collector 400 can be a positive electrode current collector or a negative electrode current collector, and the embodiments of the present application are not limited in this regard.

[0115] The first feeding device 321 can be a feeding roller, which can provide a first transfer film 421 with a first base film and a first metal layer 4212. The first feeding device 321 can also include multiple components, for example, the first feeding device 321 can include a component for providing the first base film and a component for providing the first metal layer 4212, and the component for providing the first base film and the component for providing the first metal layer 4212 are combined to form the first transfer film 421. The above is only exemplary, and the embodiments of the present application are not limited thereto.

[0116] The base film 410 can be a polymer film, and the substrate of the polymer film can be, for example, a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.

[0117] The first base film 4211 can be a release film, also known as a peel film, an isolation film, a separation film, a glue-resistant film, a release film, a plastic film, a plastic film, a mask film, a silicone oil film, a silicone paper, an anti-adhesion film, a pattern paper, a slip film, a Teflon paper, a release paper, a non-woven fabric film. It is a functional film layer that does not produce adhesion or produces slight adhesion after contact with a specific material. In general, in order to increase the release force of the plastic film, the plastic film is subjected to plasma treatment, fluorine treatment, or silicon release agent is coated on the surface layer of the film material to make the release film exhibit stable release force.

[0118] The release film is selected from one or more of PE release film, PET release film, OPP release film, PC release film, PS isolation film, PMMA release film, BOPP release film, PE release film, plastic film, TPX release film, PVC release film, PTFE release film, PET release film, Teflon release film, composite release film, polyphenyl ether release film, polytetrafluoroethylene isolation film, polyethylene release film, and composite release film (release film composed of two or more materials).

[0119] In the process of preparing the current collector 400, first, the release film has high thermal stability and can generally withstand high temperatures above 100℃, so it can form a relatively thin metal layer thereon by various physical and chemical methods. Second, the release film has good release force, which facilitates the peeling of the first metal layer 4212 thereon and provides a good basis for the complete and efficient transfer of the first metal layer 4212.

[0120] The present application takes the first base film 4211 as an example of a release film, and the first base film 4211 can also be other film layers with smooth surface and high temperature resistance.

[0121] In the embodiments of the present application, the release film is used as the first base film 4211. The release film has a smooth surface and is resistant to high temperature, which facilitates the formation of the first metal layer 4212 on the release film and the transfer of the first metal layer 4212 by the release force of the release film, thereby improving the production efficiency and product quality of the current collector 400.

[0122] The first metal layer 4212 can be made of a suitable metal material according to requirements. For example, the metal material of the first metal layer 4212 of the positive electrode current collector can be aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, silver alloy, or the like. The metal material of the first metal layer 4212 of the negative electrode current collector can be copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, silver alloy, or the like. The embodiments of the present application are not limited in this regard.

[0123] The first preheating roller 341 can heat the first transfer film 421 in various ways, so that the first transfer film 421 has been raised to a certain temperature when reaching the first transfer roller 331.

[0124] The first transfer roller 331 can transfer the first metal layer 4212 on the first transfer film 421 to the first surface of the base film 410 by heating, roller pressing, or the like. The embodiments of the present application are not limited in this regard.

[0125] When the first transfer roller 331 transfers the first metal layer 4212 by roller pressing, the first transfer roller 331 can cooperate with a transfer roller, a pressure roller, or other pressure-bearing components on the other side of the base film 410 to increase the pressure on the current collector 400, thereby improving the adhesion between the first metal layer 4212 and the base film 410, and thus improving the product quality of the current collector 400.

[0126] The current collector 400 prepared by the above-mentioned device for preparing a current collector 400 can have a high level of peel strength between the first metal layer 4212 and the base film 410.

[0127] The peel strength between the first metal layer 4212 and the base film 410 can represent the adhesion strength between the first metal layer 4212 and the base film 410. The peel strength between the first metal layer 4212 and the base film 410 can be tested by a peel strength test. The embodiments of the present application are not limited in this regard.

[0128] For example, the peel strength between the first metal layer 4212 and the base film 410 can be 700 N / m2.

[0129] In the technical scheme provided by the embodiment of the application, the unwinding roller 310 provides the base film 410, the first feeding device 321 provides the first transfer film 421, and the first transfer film 421 is preheated by the first preheating roller 341 before being transferred, so that the first transfer film 421 is raised to a certain temperature before being transferred, and the first transfer film 421 is more likely to reach a predetermined temperature at the first transfer roller 331, so that the first transfer film 421 can transfer the first metal layer 4212 to the base film 410 at a faster speed and with stronger adhesion, thereby improving the reliability of the prepared current collector 400. Therefore, the reliability of the battery device 10 can be improved.

[0130] In some possible embodiments, the diameter of the first transfer roller 331 is greater than the diameter of the first preheating roller 341.

[0131] The diameter of the first transfer roller 331 is increased, and the contact area between the current collector 400 and the first transfer roller 331 is increased when the current collector 400 passes through the first transfer roller 331, so that the time of the current collector 400 being pressed and heated is increased.

[0132] In the technical scheme provided by the embodiment of the application, the diameter of the first transfer roller 331 is greater than the diameter of the first preheating roller 341, and the contact area between the current collector 400 and the first transfer roller 331 is increased, so that the adhesion between the first metal layer 4212 of the current collector 400 and the base film 410 is improved, the reliability of the current collector 400 is improved, and the efficiency of producing the current collector 400 is improved.

[0133] In combination Figure 7 and Figure 8 The device for preparing the current collector 400 provided by another embodiment of the application is described.

[0134] Figure 7 A schematic diagram of the device for preparing the current collector 400 provided by another embodiment of the application is shown; Figure 8 Another possible schematic diagram of the device for preparing the current collector 400 provided by another embodiment of the application is shown.

[0135] In some possible embodiments, the device further comprises a coating roller 370, the coating roller 370 is arranged between the unwinding roller 310 and the first preheating roller 341, and the coating roller 370 is used to coat an adhesive on the first surface or the surface of the first metal layer 4212.

[0136] The adhesive is coated on the first surface or the surface of the first metal layer 4212 by the coating roller 370, and the first metal layer 4212 can be pasted to the base film 410 by the adhesive when the current collector 400 passes through the first transfer roller 331.

[0137] In some possible embodiments, the base film 410 further includes a second surface opposite to the first surface, and the device further includes a steel roller 380 opposite to the coating roller 370, and a space for the base film 410 to pass between the coating roller 370 and the steel roller 380; when the base film 410 passes, the first surface abuts against the surface of the coating roller 370, and the second surface abuts against the surface of the steel roller 380.

[0138] When the coating roller 370 directly coats the adhesive, the coated adhesive can be unevenly distributed on the surface due to the flowability of the adhesive. The coating roller 370 and the steel roller 380 cooperate to improve the coating pressure, so that the adhesive can be evenly distributed on the surface.

[0139] In the technical scheme provided by the embodiments of the present application, the steel roller 380 is opposite to the coating roller 370, and the steel roller 380 and the coating roller 370 cooperate to coat the adhesive on the first surface, so that the adhesive can be more evenly distributed on the first surface, thereby improving the uniformity of the adhesion between the first metal and the base film 410, and thus improving the reliability of the current collector 400.

[0140] Figure 9 A schematic diagram of a device for preparing the current collector 400 provided by another embodiment of the present application is shown.

[0141] In some possible embodiments, the device further includes a first electric generator 391 disposed between the unwinding roller 310 and the first preheating roller 341, and the first electric generator 391 is configured to discharge electricity to the first surface.

[0142] The first electric generator 391 discharging electricity to the first surface can be that the first electric generator 391 releases a corona to the first surface.

[0143] The plasma generated by high-voltage discharge can excite the molecules on the surface of the material, increase the surface energy of the first surface, and thus make the base film 410 more easily combined with other materials.

[0144] High-energy electrons in the plasma induce molecular chain scission and recombination to form polar groups such as hydroxyl (-OH) and carbonyl (-COOH), thereby enhancing the polarity of the first surface of the base film 410.

[0145] The first surface is subjected to the electric shock, the first surface is micro-etched, the surface roughness of the first surface is increased, and better adhesion points are provided for the adhesive, thereby improving the adhesion of the adhesive.

[0146] The electric shock can promote the material of the first surface to form a cross-linked structure, reduce molecular migration, keep the surface stable, and long-term improve the adhesion of the first metal layer 4212 and the base film 410.

[0147] In the technical scheme provided by the embodiments of the present application, the first surface of the base film 410 is discharged by the first electric generator 391 to polarize and ionize the molecules of the first surface of the base film 410, thereby increasing the surface energy. At the same time, the active groups of the first surface are increased, thereby improving the adhesion of the first surface of the base film 410 and the bonding strength of the base film 410 and the first metal layer 4212. Thus, the reliability of the current collector 400 can be improved.

[0148] In some possible embodiments, the discharge power P1 of the first electric generator 391 satisfies: 700W≤P1≤2000W.

[0149] In the technical scheme provided by the embodiments of the present application, the discharge power P1 of the first electric generator 391 satisfies: 700W≤P1≤2000W. On the one hand, the discharge power of the first electric generator 391 is not too high, thereby reducing the possibility of damage to the base film 410, and on the other hand, the discharge power of the first electric generator 391 is not too low, thereby playing a better polarization and ionization effect on the first surface.

[0150] Further, the discharge power P1 of the first electric generator 391 satisfies: 800W≤P1≤1500W. The discharge power P1 of the first electric generator 391 is in this range. On the one hand, the integrity of the base film 410 can be further improved, and on the other hand, a better polarization and ionization effect can be played on the first surface, thereby improving the adhesion of the first metal layer 4212 and the base film 410.

[0151] The discharge power P1 of the first electric generator 391 can also be other values, for example, the discharge power P1 of the first electric generator 391 can be any value or a value between any two values in the following: 700.0W, 765.0W, 830.0W, 895.0W, 960.0W, 1025.0W, 1090.0W, 1155.0W, 1220.0W, 1285.0W, 1350.0W, 1415.0W, 1480.0W, 1545.0W, 1610.0W, 1675.0W, 1740.0W, 1805.0W, 1870.0W, 1935.0W and 2000.0W.

[0152] In some possible embodiments, the device further comprises a first winding roller 350 for collecting the current collector 400 assembly, and a second winding roller 361 for collecting the first base film 4211.

[0153] The following description will be made in conjunction with Figures 10 to 12 The device for manufacturing the current collector 400 provided by another embodiment of the present application is shown in the schematic diagram.

[0154] Figure 10 The device for manufacturing the current collector 400 provided by another embodiment of the present application is shown in the schematic diagram. Figure 11 The device for manufacturing the current collector 400 provided by another embodiment of the present application is shown in the schematic diagram. Figure 10 The device for manufacturing the current collector 400 provided by another embodiment of the present application is shown in the schematic diagram. Figure 12 The device for manufacturing the current collector 400 provided by another embodiment of the present application is shown in the schematic diagram. Figure 10 The device for manufacturing the current collector 400 provided by another embodiment of the present application is shown in the schematic diagram.

[0155] In some possible embodiments, the base film 410 further includes a second surface opposite to the first surface, and the device further includes a second feeding device 322 and a second transfer roller 332, the second feeding device 322 is configured to provide a second transfer film 422, the second transfer film 422 includes a second base film 4221 and a second metal layer 4222, the second metal layer 4222 is arranged on a side of the second base film 4221 facing the second surface. The second transfer roller 332 is configured to transfer the second metal layer 4222 to the second surface.

[0156] The two side surfaces of the base film 410 are simultaneously subjected to the transfer of the metal layer, and the efficiency of manufacturing the current collector 400 can be improved.

[0157] Meanwhile, the first transfer roller 331 and the second transfer roller 332 located on the two sides of the base film 410 can cooperate with each other to improve the pressure applied by the first transfer roller 331 and the second transfer roller 332 to the current collector 400.

[0158] In the technical scheme provided by the embodiments of the present application, the first transfer roller 331 and the second transfer roller 332 are arranged on the two sides of the base film 410 respectively, and the first feeding device 321 and the second feeding device 322 are configured to provide the metal layer to the first surface and the second surface of the base film 410 respectively, so that the efficiency of manufacturing the current collector 400 can be improved. The first transfer roller 331 and the second transfer roller 332 located on the two sides of the base film 410 can cooperate with each other to improve the pressure applied by the first transfer roller 331 and the second transfer roller 332 to the current collector 400, so that the adhesion between the metal layer and the base film 410 can be further improved. In this way, the reliability of the current collector 400 can be improved.

[0159] In some possible embodiments, the device further includes a second preheating roller 342 arranged between the second feeding device 322 and the second transfer roller 332, and the second preheating roller 342 is configured to heat the second transfer film 422.

[0160] In the case of transferring the metal layer on both sides of the base film 410 at the same time, the heat generated by the first preheating roller 341 is difficult to penetrate the thicker material, so that the temperature of both sides of the base film 410 can be inconsistent, which can affect the consistency of the adhesion of the metal layer on both sides of the current collector 400, resulting in the product quality of the current collector 400 being affected.

[0161] The first transfer film 421 and the second transfer film 422 are heated by the first preheating roller 341 and the second preheating roller 342 respectively, so that both sides of the base film 410 are heated, and the adhesion of the first metal layer 4212 and the second metal layer 4222 to the base film 410 is good.

[0162] Meanwhile, the first preheating roller 341 and the second preheating roller 342 on both sides of the base film 410 can cooperate with each other to increase the pressure applied by the first preheating roller 341 and the second preheating roller 342 to the current collector 400, which can pre-press the current collector 400.

[0163] In the technical scheme provided by the embodiment of the application, the first transfer film 421 and the second transfer film 422 are heated by the first preheating roller 341 and the second preheating roller 342 respectively, which can improve the consistency of the adhesion of the first metal layer 4212 and the second metal layer 4222 to the base film 410, thereby improving the reliability of the current collector 400.

[0164] In some possible embodiments, the device can further include a third winding roller 362, which is used to collect the second bottom film 4221.

[0165] Figure 13 Another possible schematic diagram of the device for preparing the current collector 400 provided by another embodiment of the application is shown.

[0166] In some possible embodiments, the device further includes a second electric generator 392, which is arranged between the unwinding roller 310 and the first preheating roller 341, and is used to discharge electricity to the second surface.

[0167] The second electric generator 392 can be arranged separately from the first electric generator 391, or the second electric generator 392 can be integrated with the first electric generator 391. In the figure, the second electric generator 392 is integrated with the first electric generator 391 as an example, but the embodiment of the application is not limited thereto.

[0168] In the technical scheme provided in the embodiments of the present application, the second surface is discharged by the second electric generator 392, so that the molecules of the second surface of the base film 410 are polarized and ionized, thereby increasing the surface energy. At the same time, the active groups of the second surface are increased, thereby improving the adhesion of the adhesive on the second surface of the base film 410 and improving the bonding strength between the base film 410 and the second metal layer 4222. Further, since the first surface and the second surface are both subjected to electric treatment, the consistency of the adhesion between the base film 410 and the metal layer on both sides can be improved. Therefore, the reliability of the current collector 400 can be improved.

[0169] In some possible embodiments, the working temperature t1 of the surface of the first preheating roller 341 satisfies 100℃≤t1≤170℃.

[0170] In the technical scheme provided in the embodiments of the present application, the working temperature t1 of the surface of the first preheating roller 341 satisfies 100℃≤t1≤170℃. On the one hand, the working temperature of the surface of the first preheating roller 341 can satisfy the temperature at which the adhesive is softened, thereby improving the adhesion of the adhesive. On the other hand, the working temperature of the surface of the first preheating roller 341 is not too high, thereby reducing the possibility that the base film 410 shrinks due to high temperature. Therefore, the product quality of the current collector 400 can be improved.

[0171] Further, the working temperature t1 of the surface of the first preheating roller 341 satisfies 120℃≤t1≤160℃. When the working temperature of the surface of the first preheating roller 341 is within the range, on the one hand, the adhesive is more softened, which is conducive to further improving the adhesion of the adhesive. On the other hand, the possibility that the base film 410 shrinks can be further reduced.

[0172] The working temperature t1 of the surface of the first preheating roller 341 can also be other values. For example, the working temperature t1 of the surface of the first preheating roller 341 can be any value or a value between any two values in the following values: 100.0℃, 103.5℃, 107.0℃, 110.5℃, 114.0℃, 117.5℃, 121.0℃, 124.5℃, 128.0℃, 131.5℃, 135.0℃, 138.5℃, 142.0℃, 145.5℃, 150.0℃, 152.5℃, 156.0℃, 159.5℃, 163.0℃, 166.5℃ and 170.0℃.

[0173] The working temperature of the second preheating roller 342 can refer to the first preheating roller 341, which will not be described herein in detail.

[0174] In some possible embodiments, the working temperature t2 of the surface of the first transfer roller 331 satisfies 120℃≤t2≤200℃.

[0175] In the technical scheme provided by the embodiment of the present application, the working temperature t2 of the surface of the first transfer roller 331 satisfies 120℃≤t2≤200℃. On the one hand, the working temperature of the surface of the first transfer roller 331 can satisfy the temperature at which the adhesive is converted into a semi-liquid, so that the adhesive on the first surface can better bond the first metal layer 4212. On the other hand, the working temperature of the surface of the first transfer roller 331 is not too large, so that the possibility of shrinkage of the base film 410 caused by high temperature can be reduced. In this way, the product quality of the current collector 400 can be improved.

[0176] Further, the working temperature t2 of the surface of the first transfer roller 331 satisfies 130℃≤t1≤180℃. When the working temperature of the surface of the first transfer roller 331 is within this range, on the one hand, the heat energy generated by the first transfer roller 331 can penetrate a thicker first metal layer 4212, further improving the efficiency of the adhesive bonding the first metal layer 4212. On the other hand, the possibility of shrinkage of the base film 410 caused by the heat energy penetrating the first metal layer 4212 can be reduced.

[0177] The working temperature t2 of the surface of the first transfer roller 331 can also be other values, for example, the working temperature t2 of the surface of the first transfer roller 331 can take any value or a value between any two values of the following values: 120.0℃, 124.0℃, 128.0℃, 130.0℃, 136.0℃, 140.0℃, 144.0℃, 148.0℃, 152.0℃, 156.0℃, 160.0℃, 164.0℃, 168.0℃, 172.0℃, 176.0℃, 180.0℃, 184.0℃, 188.0℃, 192.0℃, 196.0℃ and 200.0℃.

[0178] The working temperature of the second transfer roller 332 can refer to the first transfer roller 331, and the embodiment of the present application will not be described in detail here.

[0179] In some possible embodiments, the thickness d1 of the first metal layer 4212 satisfies 0.5μm≤d1≤2μm.

[0180] Since the adhesive is applied between the interface of the first metal layer 4212 and the base film 410 in the process of transferring the first metal layer 4212 to the base film 410, heat needs to penetrate the first metal layer 4212 to reach the adhesive in the process of transferring the first metal layer 4212 by the first transfer roller 331. In the case of a thicker first metal layer 4212, the adhesive may not be heated enough, which may reduce the adhesion of the first metal layer 4212 to the base film 410, and further affect the product quality of the current collector 400.

[0181] The above embodiment preheats the current collector 400 by the first preheating roller 341, thereby reducing the possibility of insufficient heating of the binder.

[0182] Further, the above embodiment can improve the adhesion between the first metal layer 4212 and the base film 410 by means of electric shock, pressure, etc.

[0183] In the technical solution provided by the embodiment, the current collector 400 is preheated by the first preheating roller 341, which can increase the temperature of the binder when the first metal layer 4212 is transferred to the base film 410, thereby reducing the possibility of insufficient heating of the binder and improving the thickness of the bonded first metal layer 4212. Thus, the compatibility of the current collector 400 production process with the thickness of the first metal layer 4212 in the produced current collector 400 is improved, so that the device for preparing the current collector 400 can be compatible with the current collector 400 preparation process in which the thickness d1 of the first metal layer 4212 satisfies 0.5 μm≤d1≤2 μm.

[0184] Further, the thickness d1 of the first metal layer 4212 satisfies 0.8 μm≤d1≤1.5 μm. When the thickness d1 of the first metal layer 4212 satisfies the range, on the one hand, the thickness of the first metal layer 4212 is higher, and the current collector 400 prepared has stronger flow capacity, which is beneficial to improve the product performance of the current collector 400. On the other hand, the upper limit of the thickness of the first metal layer 4212 is smaller, which can improve the heat penetration rate when the first metal layer 4212 is transferred, thereby improving the adhesion between the first metal layer 4212 and the base film 410.

[0185] The thickness d1 of the first metal layer 4212 can also be other values, for example, the thickness d1 of the first metal layer 4212 can take any value or a value between any two values of the following values: 0.5 μm, 0.57 μm, 0.65 μm, 0.72 μm, 0.8 μm, 0.88 μm, 0.95 μm, 1.0 μm, 1.1 μm, 1.17 μm, 1.25 μm, 1.32 μm, 1.4 μm, 1.48 μm, 1.5 μm, 1.62 μm, 1.7 μm, 1.77 μm, 1.85 μm, 1.93 μm and 2.0 μm.

[0186] In some possible embodiments, under the working condition, the linear speed v1 of the surface of the unwinding roller 310 satisfies 30 m / min≤v1≤160 m / min.

[0187] During the transfer of the first metal layer 4212 to the base film 410, if the linear speed of the unwinding roller 310 is too fast, the contact time between the current collector 400 and the first transfer roller 331 will be short. The heat of the first transfer roller 331 will not have enough time to be transferred to the adhesive through the first metal layer 4212, which may reduce the adhesion between the first metal layer 4212 and the base film 410, thereby affecting the product quality of the current collector 400.

[0188] The above embodiment uses the first preheating roller 341 to preheat the current collector 400, thereby reducing the possibility of insufficient heating of the adhesive.

[0189] Furthermore, the above embodiments can improve the adhesion between the first metal layer 4212 and the base film 410 through methods such as electric shock and pressure.

[0190] In the technical solution provided in this application embodiment, the current collector 400 is preheated by the first preheating roller 341, which can increase the temperature of the adhesive when the first metal layer 4212 is transferred to the base film 410. This can reduce the possibility of insufficient heating caused by the adhesive being heated for too short a time, and can increase the linear speed of the surface of the unwinding roller 310. As a result, the production efficiency of the current collector 400 can be improved, so that the linear speed v1 of the surface of the unwinding roller 310 can meet the following condition: 30m / min≤v1≤160m / min.

[0191] Furthermore, the linear velocity v1 of the surface of the unwinding roller 310 satisfies: 40 m / min ≤ v1 ≤ 80 m / min. Within this range, the linear velocity of the unwinding roller 310 allows for a higher unwinding speed of the base film 410, resulting in higher efficiency in producing the current collector 400. On the other hand, the production speed of the current collector 400 is not excessively fast, allowing sufficient heating time for the adhesive between the first metal layer 4212 and the base film 410, thereby improving the adhesion between the first metal layer 4212 and the base film 410.

[0192] The linear velocity v1 of the surface of the unwinding roll 310 can also be other values. For example, the linear velocity v1 of the surface of the unwinding roll 310 can take any of the following values ​​or any value between any two of them: 30.0 m / min, 36.5 m / min, 40.0 m / min, 49.5 m / min, 56.0 m / min, 62.5 m / min, 69.0 m / min, 75.5 m / min, 80.0 m / min, 88.5 m / min, 95.0 m / min, 101.5 m / min, 108.0 m / min, 114.5 m / min, 121.0 m / min, 127.5 m / min, 134.0 m / min, 140.5 m / min, 147.0 m / min, 153.5 m / min, and 160.0 m / min.

[0193] The embodiments of the present application also provide a current collector 400, which is prepared by the device for preparing the current collector 400 provided in any of the above embodiments.

[0194] The embodiments of the present application also provide an electrode assembly 25, which comprises the current collector 400 in any of the above embodiments.

[0195] The embodiments of the present application also provide a battery monomer 20, which comprises the current collector 400 in any of the above embodiments.

[0196] The embodiments of the present application also provide a battery device 10, which comprises the current collector 400 in any of the above embodiments.

[0197] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An apparatus for preparing a current collector, characterized in that, The device includes: An unwinding roller (310) is used to provide a base film (410), the base film (410) including a first surface; A first feeding device (321) is used to provide a first transfer film (421), the first transfer film (421) including a first base film (4211) and a first metal layer (4212), the first metal layer (4212) being disposed on the side of the first base film (4211) facing the first surface; A first transfer roller (331) is used to transfer the first metal layer (4212) to the first surface to form the current collector; The first preheating roller (341) is disposed between the unwinding roller (310) and the first transfer roller (331), and the first preheating roller (341) is used to heat the first transfer film (421). The first transfer roller (331) is also used to further heat the first transfer film (421).

2. The apparatus according to claim 1, characterized in that, The diameter of the first transfer roller (331) is larger than the diameter of the first preheating roller (341).

3. The apparatus according to claim 1, characterized in that, The device further includes: A coating roller (370) is disposed between the unwinding roller (310) and the first preheating roller (341), and the coating roller (370) is used to apply an adhesive to the first surface or the surface of the first metal layer (4212).

4. The apparatus according to claim 3, characterized in that, The base film (410) further includes a second surface opposite to the first surface, and the device further includes: A steel roller (380) is disposed opposite to the coating roller (370), and the base film (410) passes between the steel roller (380) and the coating roller (370); When the base film (410) passes through, the first surface abuts against the surface of the coating roller (370), and the second surface abuts against the surface of the steel roller (380).

5. The apparatus according to claim 1, characterized in that, The device further includes: A first electric generator (391) is disposed between the unwinding roller (310) and the first preheating roller (341), and the first electric generator (391) is used to discharge to the first surface.

6. The apparatus according to claim 5, characterized in that, The discharge power P1 of the first electric generator (391) satisfies: 700W≤P1≤2000W.

7. The apparatus according to claim 1, characterized in that, The device further includes: The first take-up roller (350) is used to collect the current collector; The second take-up roller (361) is used to collect the first bottom film (4211).

8. The apparatus according to claim 1, characterized in that, The base film (410) further includes a second surface opposite to the first surface, and the device further includes: The second feeding device (322) is used to provide a second transfer film (422), the second transfer film (422) including a second base film (4221) and a second metal layer (4222), the second metal layer (4222) being disposed on the side of the second base film (4221) facing the second surface; The second transfer roller (332) is used to transfer the second metal layer (4222) to the second surface.

9. The apparatus according to claim 8, characterized in that, The device further includes: The second preheating roller (342) is disposed between the second feeding device (322) and the second transfer roller (332), and the second preheating roller (342) is used to heat the second transfer film (422).

10. The apparatus according to claim 8, characterized in that, The device further includes: A second electric generator (392) is disposed between the unwinding roller (310) and the first preheating roller (341), and the second electric generator (392) is used to discharge to the second surface.

11. The apparatus according to any one of claims 1 to 10, characterized in that, The working temperature t1 on the surface of the first preheating roller (341) satisfies: 100℃≤t1≤170℃.

12. The apparatus according to any one of claims 1 to 10, characterized in that, The working temperature t2 on the surface of the first transfer roller (331) satisfies: 120℃≤t2≤200℃.

13. The apparatus according to any one of claims 1 to 10, characterized in that, The thickness d1 of the first metal layer (4212) satisfies: 0.5μm≤d1≤2μm.

14. The apparatus according to any one of claims 1 to 10, characterized in that, Under operating conditions, the linear velocity v1 on the surface of the unwinding roller (310) satisfies: 30m / min≤v1≤160m / min.

15. A current collector, characterized in that, The current collector is prepared using the apparatus as described in any one of claims 1 to 14.

16. A battery device, characterized in that, Includes the current collector as described in claim 15.

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