Carbon-coated aluminum foil coating device and system

Abstract

The utility model relates to the technical field of aluminum foil coating, in particular to a carbon-coated aluminum foil coating device and system.The carbon-coated aluminum foil coating device comprises a coating and drying device, the coating and drying device is used for coating carbon layer slurry and positive electrode slurry on the surface of aluminum foil and drying the carbon layer slurry and the positive electrode slurry, and the coating and drying device comprises a carbon layer coating machine and a drying oven; the drying oven is used for changing rolling oil on the surface of an aluminum foil to be coated with slurry from a solid state to a liquid state, the carbon layer coating machine is used for coating the surface of the aluminum foil with carbon layer slurry, the carbon layer coating machine comprises a slurry tank, and oily conductive slurry is arranged in the slurry tank. Before slurry is coated, the aluminum foil is baked by the preheating oven, so that rolling oil on the surface of the aluminum foil is changed from a solid state to a liquid state, and meanwhile, the aluminum foil is coated with a carbon layer by adopting oily conductive slurry, so that the influence of oil stain on the coating of the carbon layer is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum foil coating, in particular to a carbon-coated aluminum foil coating device and system. Background Art

[0002] In order to achieve the performance requirements of lithium batteries such as high rate, high capacity, and long cycle, one of them is to significantly reduce the internal resistance of the battery cell, and carbon-coated aluminum foil is one of the means to reduce the internal resistance of the battery cell. In recent years, carbon-coated aluminum foil has gradually replaced aluminum foil as the only choice for lithium battery current collectors because it can reduce the internal resistance of the battery cell and improve the positive electrode stripping force.

[0003] The traditional production process of carbon-coated aluminum foil is gravure coating, and the slurry used is a water-based conductive slurry, that is, deionized water is used as the dispersion medium, polyacrylic acid is used as the adhesive, and one or more of graphite, acetylene black or graphene is used as the conductive agent. In order to remove the rolling oil on the surface of the aluminum foil, the gravure coater needs to be equipped with a corona machine or a plasma cleaning machine, and also needs to be equipped with an oven, an online CCD detection device, etc. Therefore, the production process of traditional carbon-coated aluminum foil requires that the workshop must have a certain scale and be equipped with a large number of equipment.

[0004] The Chinese invention patent application with application publication number CN117101980A discloses a battery aluminum foil coating device and coating method, which completes double-sided coating by passing the aluminum foil through an unwinding mechanism, a first-side coating assembly, a second-side coating assembly and a winding mechanism in sequence, thereby combining the aluminum foil carbon layer coating process with the electrode slurry coating process. However, the device uses a corona mechanism to treat the rolling oil on the surface of the aluminum foil, and needs to be equipped with two ovens, requiring the workshop to have a certain scale. Utility Model Content

[0005] The purpose of the utility model is to provide a carbon-coated aluminum foil coating device and system to address the defects of the prior art. Before coating the slurry, a preheating oven is used to bake the aluminum foil so that the rolling oil on the surface of the aluminum foil changes from solid to liquid. At the same time, an oily conductive slurry is used to coat the aluminum foil with a carbon layer, thereby avoiding the influence of oil pollution on the carbon layer coating.

[0006] In order to solve the above technical problems, in the first aspect, the utility model provides a carbon-coated aluminum foil coating device, including a coating and drying device, which is used to coat a carbon layer slurry and a positive electrode slurry on the surface of the aluminum foil and dry them, and the coating and drying device includes a carbon layer coater and an oven, and the oven is used to change the rolling oil on the surface of the aluminum foil to be coated with the slurry from a solid state to a liquid state, and the carbon layer coater is used to coat the carbon layer slurry on the surface of the aluminum foil, and the carbon layer coater includes a slurry tank, and an oily conductive slurry is arranged in the slurry tank.

[0007] Furthermore, the coating and drying device includes a first carbon layer coater, a first positive electrode slurry coater, a second carbon layer coater, and a second positive electrode slurry coater arranged in sequence, the first carbon layer coater and the first positive electrode slurry coater are used to coat the first side of the aluminum foil with carbon layer slurry and the positive electrode slurry, respectively, and the second carbon layer coater and the second positive electrode slurry coater are used to coat the second side of the aluminum foil with carbon layer slurry and the positive electrode slurry, respectively.

[0008] Furthermore, the oven includes a multi-layer oven, and the multi-layer oven is provided with a preheating inlet, a preheating outlet, a first inlet, a first outlet, a second inlet, and a second outlet. The aluminum foil passes through the preheating inlet, the preheating outlet, the first carbon layer coater, the first positive electrode slurry coater, the first inlet, the first outlet, the second carbon layer coater, the second positive electrode slurry coater, the second inlet, and the second outlet in sequence to complete double-sided coating.

[0009] Furthermore, the multi-layer oven is provided with three layers, namely a lower layer, a middle layer, and an upper layer, the preheating inlet and the preheating outlet are provided at the lower layer, the first inlet and the first outlet are provided at the middle layer, and the second inlet and the second outlet are provided at the upper layer.

[0010] Furthermore, the oven includes a preheating oven, which is provided with a preheating inlet and a preheating outlet, and the coating and drying device includes a double-layer oven, which is used to dry the slurry, and the double-layer oven is provided with a first inlet, a first outlet, a second inlet, and a second outlet. The aluminum foil passes through the preheating inlet, the preheating outlet, the first carbon layer coater, the first positive electrode slurry coater, the first inlet, the first outlet, the second carbon layer coater, the second positive electrode slurry coater, the second inlet, and the second outlet in sequence to complete double-sided coating.

[0011] Further, the first inlet and the second outlet are arranged at one end of the double-layer oven, and the first outlet and the second inlet are arranged at the other end of the double-layer oven.

[0012] Furthermore, the double-layer oven is provided with two layers, namely a lower layer and an upper layer, the first inlet and the first outlet are provided at the lower layer, and the second inlet and the second outlet are provided at the upper layer.

[0013] In a second aspect, the utility model provides a coating system, including an unwinding device, a carbon-coated aluminum foil coating device, and a winding device;

[0014] The unwinding device is used for unwinding aluminum foil;

[0015] The winding device is used to wind up the aluminum foil after coating;

[0016] The aluminum foil passes through the unwinding device, the coating and drying device, and the winding device in sequence to complete double-sided coating.

[0017] The beneficial effects of the utility model are:

[0018] 1. The utility model uses an oven to heat the aluminum foil before coating the aluminum foil, and the rolling oil solidified on the surface of the aluminum foil is changed from solid to liquid after high-temperature baking, making it fluid, thereby turning a large area of ​​oil stains into several small areas of oil stains. The carbon layer coating machine uses oily conductive slurry for coating, so that after the oily conductive slurry is applied, there will be no leakage due to large-area oil stains.

[0019] 2. The utility model can be configured as a multi-layer oven for preheating the aluminum foil and the oven for drying the coating on the surface of the aluminum foil. When configured as a multi-layer oven, the use efficiency of the oven is improved, which is conducive to reducing the scale of the workshop.

[0020] 3. Since the heating of the aluminum foil before coating only requires simple preheating of the aluminum foil, the utility model can separately set a preheating oven and a double-layer oven. The preheating oven is used to heat the aluminum foil before coating, and the double-layer oven can simultaneously dry the slurry on both sides of the aluminum foil, thereby improving the utilization rate of the double-layer oven and helping to reduce the scale of the workshop. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the structural layout diagram of the utility model.

[0022] Figure numerals: 1-unwinding device; 2-preheating oven; 3-first carbon layer coater; 4-first positive electrode slurry coater; 5-second carbon layer coater; 6-second positive electrode slurry coater; 7-double-layer oven; 8-winding device. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] like Figure 1 As shown, this embodiment provides a carbon-coated aluminum foil coating device, including a coating and drying device, which includes a preheating oven 2, a coater and a double-layer oven 7.

[0025] The preheating oven 2 is provided with a preheating inlet and a preheating outlet.

[0026] The coating machine includes a first carbon layer coating machine 3, a first positive electrode slurry coating machine 4, a second carbon layer coating machine 5, and a second positive electrode slurry coating machine 6 which are arranged in sequence. The first carbon layer coating machine 3 and the first positive electrode slurry coating machine 4 are used to coat the first side of the aluminum foil with carbon layer slurry and the positive electrode slurry, respectively. The second carbon layer coating machine 5 and the second positive electrode slurry coating machine 6 are used to coat the second side of the aluminum foil with carbon layer slurry and the positive electrode slurry, respectively. Among them, the first carbon layer coating machine 3 and the second carbon layer coating machine 5 both use oily conductive slurry for coating.

[0027] The double-layer oven 7 is used to dry the slurry, and the double-layer oven 7 is provided with a first inlet, a first outlet, a second inlet, and a second outlet. In this embodiment, the double-layer oven 7 is provided with two layers, namely a lower layer and an upper layer, the first inlet and the first outlet are provided at the lower layer, the second inlet and the second outlet are provided at the upper layer, the first inlet and the second outlet are arranged at one end of the double-layer oven 7, and the first outlet and the second inlet are arranged at the other end of the double-layer oven 7.

[0028] The aluminum foil passes through the preheating inlet, preheating outlet, first carbon layer coater 3, first positive electrode slurry coater 4, first inlet, first outlet, second carbon layer coater 5, second positive electrode slurry coater 6, second inlet, and second outlet in sequence to complete double-sided coating.

[0029] It is understandable that the aluminum foil is preheated by using the preheating oven 2 before coating, so that the rolling oil solidified on the surface of the aluminum foil can be changed from solid to liquid, making it fluid, thereby turning a large area of ​​oil stains into several small areas of oil stains. The first carbon layer coater 3 and the second carbon layer coater 5 use oily conductive slurry for coating, so that the oily conductive slurry will not be leaked due to large-area oil stains after coating. It should be noted that the first carbon layer coater 3 and the second carbon layer coater 5 must use oily conductive slurry, and water-based conductive slurry cannot be used, because the positive electrode slurry binder mostly uses PVDF, and PVDF cannot come into contact with water and is easily flocculated and ineffective, so oily conductive slurry must be used.

[0030] After the aluminum foil passes through the first carbon layer coating machine 3 and the first positive electrode slurry coating machine 4, the aluminum foil is coated on the first side, and then enters the double-layer oven 7 through the first entrance to dry the coating on the first side. After leaving the double-layer oven 7 through the first exit, the aluminum foil passes through the second carbon layer coating machine 5 and the second positive electrode slurry coating machine 6, and then enters the double-layer oven 7 again through the second entrance to dry the coating on the second side. Therefore, the double-layer oven 7 of this embodiment can dry both the first side and the second side of the aluminum foil, without using multiple ovens for slurry drying, thereby improving the utilization rate of the double-layer oven 7 and helping to reduce the scale of the workshop.

[0031] like Figure 1As shown, this embodiment provides another coating system, including an unwinding device 1, a carbon-coated aluminum foil coating device, and a winding device 8. The unwinding device 1 is used to unwind the aluminum foil, and the winding device 8 is used to wind up the aluminum foil after coating. The aluminum foil passes through the unwinding device 1, the coating and drying device, and the winding device 8 in sequence to complete double-sided coating.

[0032] This embodiment solves the major difficulty of oil leakage. The carbon layer coating machine uses oily conductive slurry, which can ignore the oil problem and does not need to be equipped with a corona machine or a plasma cleaning machine. In addition, the double-layer oven 7 is used to improve the utilization rate of the double-layer oven 7. This embodiment can greatly reduce the costs of equipment, plant, personnel, energy consumption, etc., and ensure the coating quality.

[0033] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A carbon-coated aluminum foil coating device, characterized in that: It comprises a coating and drying device, which is used to coat the carbon layer slurry and the positive electrode slurry on the surface of the aluminum foil and dry them. The coating and drying device comprises a carbon layer coater and an oven, and the oven is used to change the rolling oil on the surface of the aluminum foil to be coated with the slurry from solid to liquid. The carbon layer coater is used to coat the carbon layer slurry on the surface of the aluminum foil. The carbon layer coater comprises a slurry tank, and the oily conductive slurry is arranged in the slurry tank.

2. The carbon-coated aluminum foil coating device according to claim 1, characterized in that: The coating and drying device comprises a first carbon layer coater (3), a first positive electrode slurry coater (4), a second carbon layer coater (5), and a second positive electrode slurry coater (6) which are arranged in sequence, wherein the first carbon layer coater (3) and the first positive electrode slurry coater (4) are used to coat the first surface of the aluminum foil with carbon layer slurry and the positive electrode slurry respectively, and the second carbon layer coater (5) and the second positive electrode slurry coater (6) are used to coat the second surface of the aluminum foil with carbon layer slurry and the positive electrode slurry respectively.

3. The carbon-coated aluminum foil coating device according to claim 2, characterized in that: The oven comprises a multi-layer oven, and the multi-layer oven is provided with a preheating inlet, a preheating outlet, a first inlet, a first outlet, a second inlet, and a second outlet. The aluminum foil passes through the preheating inlet, the preheating outlet, the first carbon layer coater (3), the first positive electrode slurry coater (4), the first inlet, the first outlet, the second carbon layer coater (5), the second positive electrode slurry coater (6), the second inlet, and the second outlet in sequence to complete double-sided coating.

4. The carbon-coated aluminum foil coating device according to claim 3 is characterized in that: The multi-layer oven is provided with three layers, namely, a lower layer, a middle layer, and an upper layer. The preheating inlet and the preheating outlet are provided at the lower layer, the first inlet and the first outlet are provided at the middle layer, and the second inlet and the second outlet are provided at the upper layer.

5. The carbon-coated aluminum foil coating device according to claim 2, characterized in that: The oven comprises a preheating oven (2), the preheating oven (2) is provided with a preheating inlet and a preheating outlet, the coating and drying device comprises a double-layer oven (7), the double-layer oven (7) is used for drying the slurry, the double-layer oven (7) is provided with a first inlet, a first outlet, a second inlet, and a second outlet, and the aluminum foil passes through the preheating inlet, the preheating outlet, the first carbon layer coater (3), the first positive electrode slurry coater (4), the first inlet, the first outlet, the second carbon layer coater (5), the second positive electrode slurry coater (6), the second inlet, and the second outlet in sequence to complete double-sided coating.

6. The carbon-coated aluminum foil coating device according to claim 5, characterized in that: The first inlet and the second outlet are arranged at one end of the double-layer oven (7), and the first outlet and the second inlet are arranged at the other end of the double-layer oven (7).

7. The carbon-coated aluminum foil coating device according to claim 5, characterized in that: The double-layer oven (7) is provided with two layers, namely a lower layer and an upper layer, the first inlet and the first outlet are provided in the lower layer, and the second inlet and the second outlet are provided in the upper layer.

8. A coating system comprising the carbon-coated aluminum foil coating device according to any one of claims 1 to 7, characterized in that: It comprises an unwinding device (1) and a rewinding device (8); The unwinding device (1) is used for unwinding aluminum foil; The winding device (8) is used to wind up the aluminum foil after coating; The aluminum foil passes through the unwinding device (1), the coating and drying device, and the winding device (8) in sequence to complete double-sided coating.

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