Continuous coating equipment

Abstract

The utility model provides continuous coating equipment which comprises an unwinding device, a positive / negative electrode coating device, a drying oven, an electrolyte coating device and a winding device, the drying oven is provided with an upper-layer drying device and a lower-layer drying device, and the unwinding device and the positive / negative electrode coating device are sequentially arranged on the upstream of the upper-layer drying device. The electrolyte coating device is arranged at the downstream of the upper-layer drying device and at the upstream of the lower-layer drying device, the winding device is arranged at the downstream of the lower-layer drying device, and one or more tensioning devices are arranged at the upstream and the downstream of the drying oven. According to the continuous coating device, all links of continuous coating are integrated, continuous coating equipment only needs to be arranged in one glove box, and the whole process is covered with inert atmosphere; only one-time unwinding and winding are needed in the whole production link, the pole roll does not need to be wound, unwound and transferred for multiple times, the film roll cannot deviate, the production link can be simplified, the stability of the pole roll can be guaranteed, and therefore the precision of the battery cell is improved, the production efficiency is improved, and large-scale mass production is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to solid battery technical field, specifically, relate to a continuous coating equipment. BACKGROUND

[0002] In the solid-state battery industrialization process, the preparation process of electrode and electrolyte is the core link to determine whether it can realize large-scale and low-cost production. Solid-state battery needs to form an integrated composite structure of "electrode-electrolyte" by coating the positive and negative active materials and solid-state electrolyte.

[0003] The existing Chinese patent with publication number CN208839883U discloses a solid-state battery coating machine, which comprises a feeding mechanism, a coating mechanism and a winding mechanism. The coating mechanism comprises a rack, a coating roller, a coating back roller and a driving mechanism for driving the coating roller and the coating back roller. The coating roller and the coating back roller are installed on the rack and arranged side by side. One side of the coating roller is also provided with a laying mechanism, which comprises a feeding plate and an arc-shaped laying press plate. The feeding plate is connected with the laying press plate. The laying press plate and the surface of the coating roller form a laying cavity. The laying press plate is provided with a plurality of partition walls in the laying cavity along the axial direction of the coating roller. The partition walls divide the laying cavity into a plurality of coating guide grooves. The partition walls are in sealing contact with the surface of the coating roller.

[0004] The continuous coating in the prior art needs to realize "unwinding-coating-drying-winding". It is usually implemented in a "multiple single machines in series" mode, i.e. the first device coats the positive electrode, the second device dries, the third device coats the electrolyte, the fourth device dries, and the fifth device coats the negative electrode. However, this mode has high transfer loss. The transfer and re-clamping of the electrode roll are required between each process, which not only increases the risk of damage to the inert atmosphere required by the electrode roll, but also causes coating deviation due to clamping deviation, greatly affecting the precision of the battery cell.

[0005] Therefore, it is necessary to provide a continuous coating equipment that integrates each link of continuous coating and realizes continuous coating in one glove box without the need for transferring the electrode roll, which can not only simplify the production process, but also ensure the stability of the electrode roll, thereby improving the precision of the battery cell and improving the production efficiency and realizing mass production. UTILITY MODEL CONTENTS

[0006] In view of the defects in the prior art, the utility model aims to provide a continuous coating equipment.

[0007] According to the continuous coating equipment provided by the utility model, including: unwinding device, positive / negative electrode coating device, oven, electrolyte coating device and winding device, the oven is provided with two layers of drying devices, the upper layer drying device and the lower layer drying device are independently provided with import and export located at both sides of the oven, and the import and export of the upper layer drying device and the lower layer drying device are oppositely arranged, the unwinding device, the positive / negative electrode coating device are sequentially arranged at the upstream of the upper layer drying device, the electrolyte coating device is arranged at the downstream of the upper layer drying device and the upstream of the lower layer drying device, the winding device is arranged at the downstream of the lower layer drying device, and one or more tensioning devices are arranged at the upstream and downstream of the oven;

[0008] The unwinding device is provided with a coiled substrate, the substrate is conveyed to the input end of the positive / negative electrode coating device through the unwinding device, the positive / negative electrode slurry is coated on the substrate through the positive / negative electrode coating device to form a to-be-dried positive / negative electrode film, the to-be-dried positive / negative electrode film is horizontally conveyed to the working area of the upper layer drying device in the oven through the tensioning device from the output end of the positive / negative electrode coating device to form a positive / negative electrode film, the positive / negative electrode film is conveyed to the input end of the electrolyte coating device through the tensioning device, the electrolyte slurry is coated on the positive / negative electrode film through the electrolyte coating device to form a to-be-dried battery core layer film, the to-be-dried battery core layer film is horizontally conveyed to the working area of the lower layer drying device in the oven through the tensioning device from the output end of the electrolyte coating device to form a battery core layer film, and the battery core layer film is conveyed to the winding device for winding through the tensioning device.

[0009] Preferably, a first tensioning roller is arranged between the unwinding device and the positive / negative electrode coating device, the height of the first tensioning roller is higher than that of the unwinding device and the positive / negative electrode coating device, the positive / negative electrode coating device comprises a coating roller, the substrate enters the positive / negative electrode coating device from below the positive / negative electrode coating device for coating and is output from above the positive / negative electrode coating device.

[0010] Preferably, a second tensioning roller is arranged between the positive / negative electrode coating device and the oven, the second tensioning roller is arranged obliquely above the positive / negative electrode coating device, and the upper end of the second tensioning roller is aligned with the import of the upper layer drying device.

[0011] Preferably, a temperature control system is arranged in the oven, and the temperature of the upper layer drying device and the lower layer drying device can be independently adjusted.

[0012] Preferably, a third tensioning roller, a fourth tensioning roller and a fifth tensioning roller are sequentially arranged between the oven and the electrolyte coating device, the upper end of the third tensioning roller is aligned with the export of the upper layer drying device, the height of the fourth tensioning roller is lower than that of the third tensioning roller and the fifth tensioning roller, and the fifth tensioning roller is arranged directly above the electrolyte coating device.

[0013] Preferably, the electrolyte coating device comprises a coating roller, the positive / negative electrode film enters the electrolyte coating device from above the electrolyte coating device for coating, and is output from below the electrolyte coating device, and the lower end of the electrolyte coating device is aligned with the inlet of the lower drying device.

[0014] Preferably, a sixth tensioning roller is arranged between the oven and the winding device, the upper end of the sixth tensioning roller is aligned with the outlet of the lower drying device, and the winding device is arranged obliquely below the sixth tensioning roller.

[0015] Preferably, the positive / negative electrode coating device, the oven and the electrolyte coating device are each provided with a collecting device below.

[0016] Preferably, the upper drying device and the lower drying device are respectively arranged in two ovens, and the inlets and outlets of the two ovens are arranged at the same height.

[0017] Preferably, a tensioning device is arranged between the electrolyte coating device and the oven, and the to-be-dried electrode core layer film is kept in a tensioned state by the tensioning device.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] The utility model discloses a continuous coating equipment for the production of lithium battery electrode core, which comprises a glove box, a positive / negative electrode coating device, an oven, an electrolyte coating device and a winding device. BRIEF DESCRIPTION OF DRAWINGS

[0020] Other features, objects and advantages of the utility model will become more apparent through reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1 The structure diagram of the continuous coating equipment is mainly embodied in the utility model;

[0022] The drawing label: unwinding device 1, positive / negative electrode coating device 2, oven 3, electrolyte coating device 4, winding device 5, first tensioning roller 6, second tensioning roller 7, third tensioning roller 8, fourth tensioning roller 9, fifth tensioning roller 10, sixth tensioning roller 11. DETAILED DESCRIPTION

[0023] The utility model will be instructed in detail below in combination with specific embodiments. The following embodiments will help the person skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the utility model, a number of changes and improvements can be made. These all belong to the protection scope of the utility model.

[0024] As Figure 1 The utility model provides a kind of continuous coating equipment, including: unwinding device 1, positive / negative pole coating device 2, oven 3, electrolyte coating device 4 and winding device 5, oven 3 is provided with two layers of drying device up and down, upper layer drying device and lower layer drying device are independently provided with import and export located at the both sides of oven 3, and the import and export of upper layer drying device and lower layer drying device are oppositely arranged, unwinding device 1, positive / negative pole coating device 2 are sequentially arranged in the upstream of upper layer drying device, electrolyte coating device 4 is arranged in the downstream of upper layer drying device and is arranged in the upstream of lower layer drying device, winding device 5 is arranged in the downstream of lower layer drying device, and one or more tensioning devices are arranged in the upstream and downstream of oven 3;Coiled substrate is provided on unwinding device 1, substrate is conveyed to the input end of positive / negative pole coating device 2 by unwinding device 1, positive / negative pole slurry is coated on substrate by positive / negative pole coating device 2 to form to-be-dried positive / negative pole film, to-be-dried positive / negative pole film is horizontally conveyed to the working area of upper layer drying device in oven 3 from the output end of positive / negative pole coating device 2 by tensioning device to form positive / negative pole film, positive / negative pole film is conveyed to the input end of electrolyte coating device 4 by tensioning device, electrolyte slurry is coated on positive / negative pole film by electrolyte coating device 4 to form to-be-dried battery core layer film, to-be-dried battery core layer film is horizontally conveyed to the working area of lower layer drying device in oven 3 from the output end of electrolyte coating device 4 by tensioning device to form battery core layer film, and battery core layer film is conveyed to winding device 5 for winding by tensioning device.

[0025] First tensioning roller 6 is arranged between unwinding device 1 and positive / negative pole coating device 2, and the height of first tensioning roller 6 is higher than that of unwinding device 1 and positive / negative pole coating device 2, so that the substrate roll is always in tension when being conveyed from unwinding device 1 to positive / negative pole coating device 2 through first tensioning roller 6.

[0026] Positive / negative pole coating device 2 includes coating roller, substrate enters positive / negative pole coating device 2 from below for coating, and is output from above. Positive / negative pole coating device 2 generally adopts double-roller cooperative design, that is, double-roller combination of "coating roller + back pressure roller" is adopted, back pressure roller adopts elastic material (such as polyurethane), and the deflection of coating roller is passively offset by adjusting the pressure distribution of back pressure roller, so as to guarantee the uniformity of coating thickness.

[0027] The second tension roller 7 is arranged obliquely above the positive / negative electrode coating device 2, so that the positive / negative electrode film to be dried is always in a tension state when it is transported from the positive / negative electrode coating device 2 to the oven 3 via the second tension roller 7. The upper end of the second tension roller 7 is aligned with the inlet of the upper drying device. In order to ensure uniform heating during the drying process, the positive / negative electrode film to be dried in the oven 3 generally needs to be kept in a horizontal state. The positive / negative electrode film to be dried is transported from the upper end of the second tension roller 7 to the oven 3, which can well maintain the horizontal state.

[0028] The oven 3 is provided with a temperature control system. Since there is a difference in the optimal drying temperature of the positive / negative electrode slurry and the solid-state electrolyte slurry, the temperature of the upper drying device and the lower drying device needs to be independently adjustable. The temperature control system can adopt the method of hot air circulation drying, or the method of electric heating pipe heating, or the method of light curing, which can be adjusted according to actual application.

[0029] The oven 3 and the electrolyte coating device 4 are sequentially provided with a third tension roller 8, a fourth tension roller 9 and a fifth tension roller 10. The upper end of the third tension roller 8 is aligned with the outlet of the upper drying device, that is, the upper end of the second tension roller 7 and the upper end of the third tension roller 8 are maintained at the same height. Through the tension of the two tension rollers, it can be ensured that the film is always in a horizontal state.

[0030] The heights of the fourth tension roller 9 and the fifth tension roller 10 are lower than that of the third tension roller 8. The fifth tension roller 10 is arranged directly above the electrolyte coating device 4. In order to adjust the direction of the film roll, so that the film roll can return to the oven 3, the turning is realized by multiple tension rollers. In actual application, the arrangement of these tension rollers can be adjusted.

[0031] The electrolyte coating device 4 includes a coating roller. The positive / negative electrode film enters the electrolyte coating device 4 from above the electrolyte coating device 4 for coating, and is output from below the electrolyte coating device 4. The lower end of the electrolyte coating device 4 is aligned with the inlet of the lower drying device. Similarly, the electrolyte coating device 4 also adopts a double-roller cooperative design, that is, a double-roller combination of “coating roller + back pressure roller” is adopted to ensure the uniformity of the coating thickness.

[0032] The oven 3 and the winding device 5 are provided with a sixth tension roller 11, and the upper end of the sixth tension roller 11 is aligned with the outlet of the lower drying device. Similarly, the positive / negative electrode film to be dried in the oven 3 also needs to be kept in a horizontal state. Therefore, the lower end of the electrolyte coating device 4 is aligned with the inlet of the lower drying device, the upper end of the sixth tension roller 11 is aligned with the outlet of the lower drying device, and the upper end of the sixth tension roller 11 is maintained at the same height as the upper end of the sixth tension roller 11. Through the tension of the roller of the electrolyte coating device 4 and the sixth tension roller 11, it can be ensured that the film is always in a horizontal state.

[0033] The winding device 5 is arranged obliquely below the sixth tensioning roller 11, so that the electrode layer film is always in a tensioned state when being conveyed to the winding device 5 through the sixth tensioning roller 11, thereby ensuring the stability of winding.

[0034] The positive / negative electrode coating device 2, the oven 3 and the electrolyte coating device 4 are all provided below with a collecting device, which can recycle the dropped slurry and avoid polluting the operating environment.

[0035] In another specific embodiment, the upper layer drying device and the lower layer drying device are respectively arranged in the two ovens 3, and the inlets and outlets of the two ovens 3 are arranged at the same height. That is, continuous coating is realized by the two ovens, which requires that the tensioning device arranged above and below the electrolyte coating device 4 and the oven 3, and the electrode layer film to be dried is kept in a tensioned state by the tensioning device.

[0036] The center axes of the various rollers in the present application are all arranged in parallel, and the centers of the various rollers are arranged in the same vertical plane, which ensures that the movement and stress of the electrode roll in each link are consistent, thereby ensuring uniform coating. Further, a deviation correcting device can be arranged on each roller to ensure that the position of the film will not deviate. Still further, a hot press roller can be added in some links to make the structure more stable.

[0037] The present application can greatly improve production efficiency and reduce transfer loss between processes while ensuring the interface bonding strength and consistency of the composite structure by sequentially completing the coating and drying of the positive / negative electrode slurry and the solid-state electrolyte slurry on the continuously running current collector or substrate.

[0038] The continuous coating equipment of the present application integrates each link of continuous coating, and only needs to be arranged in one glove box, and the whole process is covered by an inert atmosphere. The whole production link of the present application only has one winding and winding, and does not need to wind and unwind the electrode roll multiple times and transfer it, and the film roll will not deviate, which can not only simplify the production link, but also ensure the stability of the electrode roll, thereby improving the accuracy of the electrode and improving the production efficiency and realizing mass production.

[0039] In the description of the present application, it should be understood that the terms “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A continuous coating apparatus characterized by, The application relates to a battery electrode drying device, which comprises a unwinding device (1), a positive / negative electrode coating device (2), an oven (3), an electrolyte coating device (4) and a winding device (5), the oven (3) is provided with two layers of drying devices, the upper drying device and the lower drying device are independently provided with inlets and outlets on both sides of the oven (3), the inlets and outlets of the upper drying device and the lower drying device are oppositely arranged, the unwinding device (1) and the positive / negative electrode coating device (2) are sequentially arranged on the upstream side of the upper drying device, the electrolyte coating device (4) is arranged on the downstream side of the upper drying device and on the upstream side of the lower drying device, and the winding device (5) is arranged on the downstream side of the lower drying device, and one or more tensioning devices are arranged on the upstream and downstream sides of the oven (3). The battery electrode drying device is characterized in that a rolled base material is arranged on the unwinding device (1), the base material is conveyed to the input end of the positive / negative electrode coating device (2) through the unwinding device (1), positive / negative electrode paste is coated on the base material through the positive / negative electrode coating device (2) to form a to-be-dried positive / negative electrode film, the to-be-dried positive / negative electrode film is horizontally conveyed to the working area of the upper drying device in the oven (3) through the tensioning device to form a positive / negative electrode film, the positive / negative electrode film is conveyed to the input end of the electrolyte coating device (4) through the tensioning device, electrolyte paste is coated on the positive / negative electrode film through the electrolyte coating device (4) to form a to-be-dried battery core layer film, the to-be-dried battery core layer film is horizontally conveyed to the working area of the lower drying device in the oven (3) through the tensioning device to form a battery core layer film, and the battery core layer film is conveyed to the winding device (5) through the tensioning device for winding. ​ The first tensioning roller (6) is arranged between the unwinding device (1) and the positive / negative electrode coating device (2), the height of the first tensioning roller (6) is higher than that of the unwinding device (1) and the positive / negative electrode coating device (2), the second tensioning roller (7) is arranged between the positive / negative electrode coating device (2) and the oven (3), the second tensioning roller (7) is arranged obliquely above the positive / negative electrode coating device (2), the upper end of the second tensioning roller (7) is aligned with the inlet of the upper drying device, the third tensioning roller (8), the fourth tensioning roller (9) and the fifth tensioning roller (10) are sequentially arranged between the oven (3) and the electrolyte coating device (4), the upper end of the third tensioning roller (8) is aligned with the outlet of the upper drying device, the height of the fourth tensioning roller (9) is lower than that of the third tensioning roller (8) and the fifth tensioning roller (10), the fifth tensioning roller (10) is arranged directly above the electrolyte coating device (4), the lower end of the electrolyte coating device (4) is aligned with the inlet of the lower drying device, the sixth tensioning roller (11) is arranged between the oven (3) and the winding device (5), the upper end of the sixth tensioning roller (11) is aligned with the outlet of the lower drying device, the winding device (5) is arranged obliquely below the sixth tensioning roller (11), the tensioning device arranged in up-down staggered mode is arranged between the electrolyte coating device (4) and the oven (3), the film of the battery cell to be dried is kept in a tensioned state by the tensioning device. The oven (3) is provided with a temperature control system, and the temperature of the upper drying device and the lower drying device can be independently adjusted.

2. The continuous coating apparatus according to claim 1, wherein The positive / negative electrode coating device (2) comprises a coating roller, the substrate enters the positive / negative electrode coating device (2) from below the positive / negative electrode coating device (2) for coating, and is output from above the positive / negative electrode coating device (2).

3. The continuous coating apparatus of claim 1, wherein The electrolyte coating device (4) comprises a coating roller, the positive / negative electrode film enters the electrolyte coating device (4) from above the electrolyte coating device (4) for coating, and is output from below the electrolyte coating device (4).

4. The continuous coating apparatus according to claim 1, wherein The lower part of the positive / negative electrode coating device (2), the oven (3) and the electrolyte coating device (4) is provided with a collecting device.

5. The continuous coating apparatus of claim 1, wherein The upper drying device and the lower drying device are arranged in two ovens (3) respectively, and the inlet and outlet of the two ovens (3) are arranged at the same height.

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