A double-sided composite coating device for lithium battery current collector electrodes

Abstract

The present invention discloses a double-sided composite coating device for a current collector electrode of a lithium battery, which is provided with a discharge mechanism, a first coating module, a second coating module, a receiving mechanism, and a roller group unit for setting the travel path of the coating material roll in sequence from the coating material roll feeding position to the discharging position; the first coating module, the second coating module, the discharge mechanism and the receiving mechanism are arranged in a horizontal position, and the discharge mechanism and the receiving mechanism are respectively placed on the left side or / and right side of the two coating modules. The coating device coats both sides simultaneously, thereby improving the coating efficiency. The arrangement positions of the coating module, the receiving mechanism and the discharge mechanism are rationally arranged to reduce the overall height of the equipment, making maintenance easier and more convenient. The entire roller group system is arranged as an integrated assembly and adopts an integrated dragging movement form, which has high precision. The evaporation coating unit is designed as an independent detachable structure, which can be removed from the main vacuum chamber for easy processing and transportation.

Description

Technical Field

[0001] The present invention relates to the fields of lithium-ion batteries and coating equipment, and in particular to a double-sided composite coating equipment for lithium battery current collector electrodes. Background Art

[0002] Currently, the common positive and negative current collector coatings for lithium batteries mainly include extended copper foil, electrolytic copper foil, extended aluminum foil and sputtering coating; the existing technologies and existing problems are as follows: 1. Extended copper foil and aluminum foil are repeatedly rolled and pickled, and the equipment requirements are high. The thickness of 10 to 16 microns can be achieved, but it is difficult to continue to thin it and the quality of the finished product cannot be further improved; 2. Electrolytic copper solution can achieve mass production of 6 to 8 micron copper foil; however, the initial preparation of the electrolyte is cumbersome, and the characteristics of electrolysis will cause the surface roughness of both sides of the copper foil to be too large, requiring surface treatment of the burrs and heat-resistant layer treatment. 3. Sputtering coating bombards copper and aluminum metals with high-energy ions into gaseous particles, which are deposited on the molecular level of the film surface to form chemical bonds. The coating thickness can be controlled to nanometer-level precision, with a short coating time and high adhesion rate. However, the gas content of the produced metal film is too high, resulting in high overall cost and energy consumption. 4. Evaporation coating uses a certain heating evaporation method to evaporate copper and aluminum metals and vaporize them. The particles are deposited on the film surface and condensed into a metal film. The surface metal film has a low gas content and low energy consumption, making it suitable for large-scale thickening. However, the substrate adhesion strength of the evaporation coating is low and cannot meet industry requirements.

[0003] Therefore, developing a superior double-sided composite coating equipment for lithium battery current collector electrodes to overcome the shortcomings of existing processes and technologies is of great significance and has great application prospects for improving coating efficiency and reducing production costs during the thickening process. To further improve the applicability of the coating equipment, reducing the height of the double-sided composite coating equipment and reducing the difficulty of processing and transportation have become essential considerations. Summary of the Invention

[0004] To address the above-mentioned issues, the present invention provides a double-sided composite coating device for lithium battery current collector electrodes. The device comprises two coating modules, each of which coats both sides of a roll of film. This allows for simultaneous double-sided coating of the roll while it moves between the unwinding and rewinding mechanisms, thereby improving coating efficiency. Furthermore, by rationally arranging the coating modules, the rewinding and unwinding mechanisms, the device's height, floor space, and cost are effectively reduced, while also reducing the plant's height requirements and making maintenance easier and more convenient.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a double-sided composite coating device for a current collector electrode of a lithium battery. The double-sided composite coating device is provided with a discharge mechanism, a first coating module, a second coating module, a receiving mechanism, and a roller group unit for setting the travel path of the coating material roll in sequence from the coating material roll feeding position to the coating material roll discharging position; the first coating module, the second coating module, the discharge mechanism and the receiving mechanism are arranged in a horizontal position, and the discharge mechanism and the receiving mechanism are respectively placed on the left side and / or the right side of the two coating modules; the first coating module completes the coating on one side of the coating material roll, and the second coating module completes the coating on the other side of the coating material roll.

[0007] Furthermore, the first coating module and the second coating module both include a coating roller and a coating unit arranged around the roller; the coating unit is a combination of a sputtering coating unit and an evaporation coating unit.

[0008] Furthermore, the vacuum chamber where the evaporation coating unit is located is an independent detachable structure and can be removed from the main vacuum chamber.

[0009] Furthermore, the roller group unit includes a plurality of guide rollers distributed on the material roll travel path and a cantilever end panel at the cantilever end.

[0010] Furthermore, the roller group unit is assembled in an integrated manner and adopts an integrated dragging movement form.

[0011] Furthermore, the double-sided composite coating equipment also includes a swing arm mechanism, a correction mechanism, a tension roller, a film thickness detection unit, a flattening mechanism, a pre-treatment ion source, a post-treatment ion source, a vacuum pump unit and multiple cantilever supports connected to the equipment body.

[0012] The beneficial effects of the present invention are:

[0013] The present invention provides a double-sided composite coating device for lithium battery current collector electrodes, which is provided with two coating modules to respectively complete the coating of both sides of the coating material roll, so that the coating material roll can move between the unwinding mechanism and the receiving mechanism while the coating material roll can also run back and forth multiple times between the unwinding mechanism and the receiving mechanism, thereby achieving multiple coatings to achieve a multi-layer film or a film layer with a desired thickness, completing the double-sided coating of the coating material roll, and effectively improving the coating efficiency. Through a reasonable layout, the arrangement positions of the coating module, the receiving mechanism and the unwinding mechanism are arranged, that is, the first coating module, the second coating module, the unwinding mechanism and the receiving mechanism are arranged in a horizontal position, and the unwinding mechanism and the receiving mechanism are respectively placed on the left side or / and right side of the two coating modules; this arrangement further reduces the total height of the equipment, reduces the equipment's requirements for factory building height, and makes equipment maintenance simpler and more convenient. Furthermore, by setting up a swing arm mechanism, tension roller, flattening mechanism, and correction mechanism to better cooperate with the guide roller, it is further ensured that the coating material roll will not be loose, deformed, twisted, etc. during the entire movement process, reducing coating failures and improving coating uniformity. The entire roller group system is set as an integrated assembly, and adopts an integrated drag movement form with high precision. At the same time, the evaporation coating unit (that is, the vacuum chamber of the first evaporation source and the vacuum chamber of the second evaporation source at the bottom) is an independent detachable structure, which can be removed from the main vacuum chamber above it for easy processing and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings:

[0015] Figure 1 This is a schematic structural diagram of a double-sided composite coating device for a lithium battery current collector electrode provided by one embodiment of the present invention.

[0016] Figure 2 This is a schematic structural diagram of a double-sided composite coating device for a lithium battery current collector electrode provided by another embodiment of the present invention.

[0017] Explanation of the numbers: coating material roll 00, unwinding mechanism A01, swing arm mechanism A02, flattening roller A02-1, correcting mechanism A03, tension roller A04, film thickness detection unit A05, guide roller A06, flattening mechanism A07, pre-treatment ion source A08, first sputtering coating unit A09, coating roller A10, evaporation coating unit A11, second sputtering coating unit A012, post-treatment ion source A13, receiving mechanism A14, cantilever support A15, vacuum pump unit A16, cantilever end panel A17, upper vacuum main chamber A18, first evaporation source vacuum chamber A19, second evaporation source vacuum chamber A20. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] The present invention provides a double-sided composite coating device for a current collector electrode of a lithium battery. The double-sided composite coating device is provided with a discharge mechanism, a first coating module, a second coating module, a receiving mechanism, and a roller group unit for setting the travel path of the coating material roll in sequence from the coating material roll feeding position to the coating material roll discharging position; the first coating module, the second coating module, the discharge mechanism and the receiving mechanism are arranged in a horizontal position, and the discharge mechanism and the receiving mechanism are respectively placed on the left side and / or the right side of the two coating modules; the first coating module completes the coating on one side of the coating material roll, and the second coating module completes the coating on the other side of the coating material roll.

[0020] The first and second coating modules each include a coating roller and a coating unit disposed therearound; the coating unit is a combination of a sputtering coating unit and an evaporation coating unit. The combination coating arrangement is one of a sputtering coating unit-evaporation coating unit-sputtering coating unit, a sputtering coating unit-evaporation coating unit, a sputtering coating unit-sputtering coating unit, or a sputtering coating unit-sputtering coating unit-evaporation coating unit. The vacuum chamber housing the evaporation coating unit is an independent, detachable structure that can be removed from the main vacuum chamber for ease of processing and transportation.

[0021] The roller assembly unit comprises a plurality of guide rollers distributed on the material roll travel path and a cantilever end panel at the cantilever end. The roller assembly unit is assembled in an integrated manner and adopts an integrated dragging movement form, which has high precision.

[0022] The double-sided composite coating equipment also includes a swing arm mechanism, a correction mechanism, a tension roller, a film thickness detection unit, a flattening mechanism, a pre-treatment ion source, a post-treatment ion source, a vacuum pump unit and multiple cantilever supports connected to the equipment body.

[0023] The swing arm mechanism and the deviation correction mechanism are sequentially arranged after the unwinding mechanism and before the receiving mechanism to ensure that the coating material roll does not become loose, deformed, twisted, etc. during the unwinding and receiving process; a flattening roller is provided in the swing arm mechanism.

[0024] The tension roller and the flattening mechanism are arranged between the guide rollers as required to further ensure the flatness of the coating material roll when it travels along the guide roller path.

[0025] The film thickness detection unit and the pretreatment ion source are sequentially arranged before the first coating module and the second coating module, and respectively perform coating thickness detection and pretreatment on both sides of the coating material roll before coating.

[0026] The post-processing ion source is arranged after the first coating module and the second coating module to perform post-processing on the coating material roll after coating.

[0027] The vacuum pump unit is arranged in the corresponding space according to the process requirements to ensure the vacuum process requirements of the coating.

[0028] Example 1

[0029] like Figure 1 As shown, a double-sided composite coating device for lithium battery current collector electrodes, the double-sided composite coating device, the coating material roll 00 is sequentially provided with a feeding mechanism A01, a first coating module, a second coating module, a receiving mechanism A14, and a roller group unit for setting the travel path of the coating material roll 00 from the feeding position to the discharging position; the first coating module, the second coating module, the feeding mechanism and the receiving mechanism are arranged in a horizontal position, and the feeding mechanism A01 and the receiving mechanism A14 are respectively placed on the left side of the two coating modules; the first coating module and the second coating module are arranged in a horizontal position, and the feeding mechanism A01 and the receiving mechanism A14 are respectively placed on the left and right sides\left or right side of the two coating modules; the first coating module completes the coating on one side of the coating material roll, and the second coating module completes the coating on the other side of the coating material roll.

[0030] Both the first and second coating modules include a coating roller A10 and surrounding coating units. These units are arranged as a combined coating arrangement consisting of a first sputtering coating unit A09, an evaporation coating unit A11, and a second sputtering coating unit A12. The vacuum chambers A19 and A20 housing the evaporation coating unit A09 are independently removable and can be removed from the main vacuum chamber for ease of processing and transportation.

[0031] The roller assembly unit includes a plurality of guide rollers A06 distributed on the material roll travel path and a cantilever end panel A17 at the cantilever end. The roller assembly unit is an integrated assembly and adopts an integrated drag movement form with high precision.

[0032] The double-sided composite coating equipment also includes a swing arm mechanism A02, a correction mechanism A03, a tension roller A04, a film thickness detection unit A05, a flattening mechanism A07, a pre-treatment ion source A08, a post-treatment ion source A13, a vacuum pump unit A16 and multiple cantilever supports A15 connected to the equipment body.

[0033] The swing arm mechanism A02 and the correction mechanism A03 are arranged in sequence after the unloading mechanism A01 and before the receiving mechanism A14 to ensure that the coating material roll 00 does not become loose, deformed, twisted, etc. during the unloading and receiving process; a flattening roller A02-1 is provided in the swing arm mechanism A02.

[0034] The tension roller A04 and the flattening mechanism A07 are arranged between the guide rollers A06 as required to further ensure the flatness of the coating roll when it travels along the guide roller path.

[0035] The film thickness detection unit and the pretreatment ion source A07 are sequentially arranged before the first coating module and the second coating module, and respectively perform coating thickness detection and pretreatment on both sides of the coating material roll 00 before coating.

[0036] The post-processing ion source A13 is arranged after the first coating module and the second coating module to perform post-coating processing on the coating material roll 00.

[0037] The vacuum pump unit is arranged in the corresponding space according to the process requirements to ensure the vacuum process requirements of the coating.

[0038] The specific coating process of the double-sided composite coating equipment for the current collector electrode of a lithium battery is as follows: the coating material roll 00 is fixed on the unloading mechanism A01; the unloading mechanism A01 is connected to the swing arm mechanism A02, and the swing arm mechanism A02 is provided with a flattening roller A02-1, which plays the role of flattening the coating material roll while tensioning; after the coating material roll 00 is transmitted from the unloading mechanism A01, it first passes through the swing arm mechanism A02 so that it is always in an ideal state during the movement; then it passes through the correction mechanism A03, the guide roller A06, the film thickness detection unit A05, and the tension roller A04 in turn to perform corresponding surface treatment on it; then it passes through the flattening mechanism A07, the pretreatment ion source A08, the first The sputtering coating unit A09, the evaporation coating unit A11, the second sputtering coating unit A012, and the post-processing ion source A13 complete the coating on one side of the coating roll 00; thereafter, the coating roll 00 passes through the guide roller A06, the flattening mechanism A07, the tension roller A04, etc. in sequence according to the preset path to enter the second coating module, and passes through the film thickness detection unit A05, the tension roller A04, the flattening mechanism A07, the pre-processing ion source A08, the first sputtering coating unit A09, the evaporation coating unit A11, the second sputtering coating unit A12, and the post-processing ion source A13 in the same manner to complete the coating on the other side of the coating roll 00. At this time, double-sided coating is completed. Finally, the double-sided coated roll passes through guide rollers A06, a flattening mechanism A07, tension rollers A04, a vacuum pump unit A16, a deflection correction mechanism A03, and a swing arm mechanism A02, ensuring that it enters the reeling mechanism A14 under the preset tension for final collection. The equipment's support end is equipped with multiple cantilever supports A15 for docking with the main body of the device. The cantilever end panels A17, installed at the cantilever ends of the roller assembly units, ensure the strength of the roller assembly while improving the installation accuracy and operability of the entire machine. The entire roller assembly system is assembled as a single unit and uses a drag-and-tow mechanism for high precision. The main vacuum chamber A18, along with the bottom vacuum chambers A19 (where the first evaporation source resides) and A20 (where the second evaporation source resides) are independent, removable structures for ease of processing and transportation.

[0039] Example 2

[0040] The only difference between Example 2 and Example 1 is that the first coating module, the second coating module, the unloading mechanism and the receiving mechanism are arranged horizontally, and the unloading mechanism A01 and the receiving mechanism A14 are respectively placed on the right side of the two coating modules;

[0041] In summary, the present invention provides a double-sided composite coating device for lithium battery current collector electrodes, which completes the coating on both sides of the coating roll by setting two coating modules respectively, so that the coating roll can move between the unwinding mechanism and the receiving mechanism while the coating roll can also run back and forth multiple times between the unwinding mechanism to achieve multiple coatings to achieve a multi-layer film or a film layer with a desired thickness, thereby completing the double-sided coating of the coating roll and effectively improving the coating efficiency; through reasonable layout, the arrangement positions of the coating module, the receiving mechanism and the unwinding mechanism, that is, the first coating module and the second coating module are level The unloading and receiving mechanisms are positioned on either the left or right sides of the two coating modules. This arrangement effectively reduces the overall height of the equipment, lowering the building height requirement and making maintenance easier and more convenient. The compact layout also reduces volume, reducing equipment costs and floor space. Furthermore, the swing arm mechanism, tension roller, flattening mechanism, and deflection correction mechanism, which better coordinate with the guide rollers, further ensure that the coating material roll does not sag, deform, or twist during operation, minimizing coating failures and improving coating uniformity. The entire roller assembly is assembled as a single unit and uses a drag-and-tow mechanism for high precision. Furthermore, the main vacuum chamber and the vacuum chambers at the bottom containing the first and second evaporation sources are independently removable structures, facilitating processing and transportation.

Claims

1. A double-sided composite coating device for lithium battery current collector electrodes, characterized in that: The double-sided composite coating equipment is provided with a discharge mechanism, a first coating module, a second coating module, a receiving mechanism, and a roller group unit for setting the travel path of the coating material roll in sequence from the coating material roll feeding position to the discharging position; the first coating module, the second coating module, the discharge mechanism and the receiving mechanism are arranged in a horizontal position, and the discharge mechanism and the receiving mechanism are respectively placed on the left side or / and right side of the two coating modules; the first coating module completes the coating of one side of the coating material roll, and the second coating module completes the coating of the other side of the coating material roll; the evaporation coating The membrane unit is vertically arranged directly below the equipment. The vacuum chamber where the evaporation coating unit is located is an independent detachable structure and can be removed from the main vacuum chamber; the roller group unit includes multiple guide rollers distributed on the material roll walking path and a cantilever end panel at the cantilever end; the roller group unit is an integrated assembly and adopts an integrated dragging movement form; the double-sided composite coating equipment also includes a swing arm mechanism, a correction mechanism, a tension roller, a film thickness detection unit, a flattening mechanism, a pre-treatment ion source, a post-treatment ion source, a vacuum pump unit and multiple cantilever supports connected to the equipment body.

2. The double-sided composite coating device according to claim 1, further characterized in that: The first coating module and the second coating module both include a coating roller and coating units arranged around the roller; the coating units are a combination of sputtering coating units and evaporation coating units.

3. The double-sided composite coating device according to claim 2, characterized in that: The swing arm mechanism and the deviation-correcting mechanism are sequentially arranged behind the material-discharging mechanism and before the material-receiving mechanism; a flattening roller is also arranged in the swing arm mechanism.

4. The double-sided composite coating device according to claim 2, characterized in that: The tension roller and the flattening mechanism are arranged between the guide rollers as required.

5. The double-sided composite coating device according to claim 2, characterized in that: The film thickness detection unit and the pretreatment ion source are sequentially arranged before the first coating module and the second coating module, and respectively perform coating thickness detection and pretreatment on both sides of the coating material roll before coating.

6. The double-sided composite coating device according to claim 2, characterized in that: The post-processing ion source is arranged after the first coating module and the second coating module to perform post-processing on the coating material roll after coating.

7. The double-sided composite coating device according to claim 2, characterized in that: The vacuum pump unit is arranged in a corresponding space according to process requirements.

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