Film covering device and film covering system

Abstract

The utility model provides a laminating device and laminating system.The laminating device comprises a composite roller set, the composite roller set comprises a plurality of composite rollers, the multiple composite rollers are arranged in pairs, the peripheral face of at least one of the multiple composite rollers is provided with a first press-fit part and a second press-fit part, and the first press-fit part and the second press-fit part are arranged on the peripheral face of at least one of the multiple composite rollers; the first pressing part and the second pressing part are arranged in the circumferential direction of the composite roller, the first pressing part and the second pressing part extend along the axis of the composite roller, and the second pressing part is a concave part. According to the film laminating device, the high-pressure area and the low-pressure area can be formed on the composite roller, and the materials are discontinuously compacted on the second sheet to form the composite part, so that when the composite part is cut, the situation that the cutter is blunt due to the fact that the cutter adheres to the materials, and burrs are generated on the edge of the second sheet is avoided, and therefore the film laminating device can be better suitable for the lamination process.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, and more specifically, to a coating device. Background Art

[0002] In the related technology, the coating system can continuously press the lithium-rich film onto the copper foil current collector, and effectively increase the lithium ion content of the negative electrode plate through the continuous coating process, thereby effectively increasing the capacity of the overall battery cell. However, the negative electrode plates produced by the existing coating system can be used in the winding process, but when used in the lamination process, the cutter frequently cuts the negative electrode plate, which will cause the blade to stick to lithium, and then make the blade blunt, resulting in burrs on the cut edge of the copper foil, and the burrs can easily penetrate the diaphragm and cause a short circuit between the positive and negative electrodes, causing the battery to heat up or even explode, thereby endangering the personal safety of the user. Utility Model Content

[0003] The utility model provides a new technical solution for a coating device, which can at least solve the problem that when the negative electrode sheets produced by the coating device in the prior art are used in the lamination process, the cutter is prone to lithium adhesion, resulting in burrs on the edge of the copper foil.

[0004] The utility model also provides a film coating system, comprising the above-mentioned film coating device.

[0005] According to a first aspect of the utility model, a coating device is provided, comprising: a composite roller group, the composite roller group comprising a plurality of composite rollers, the plurality of composite rollers being arranged in pairs, a first pressing portion and a second pressing portion being provided on an outer peripheral surface of at least one of the plurality of composite rollers, the first pressing portion and the second pressing portion being arranged along the circumferential direction of the composite roller, the first pressing portion and the second pressing portion respectively extending along the axis of the composite roller, and the second pressing portion being a recessed portion.

[0006] Optionally, at least two of the first pressing parts are provided on the composite roller, the number of the second pressing parts is equal to the number of the first pressing parts, and at least two of the first pressing parts and at least two of the second pressing parts are staggered along the circumference of the composite roller.

[0007] Optionally, the arc lengths of at least two of the first pressing portions are equal, and the arc lengths of at least two of the second pressing portions are equal.

[0008] Optionally, the first pressing portion is the outer circumferential surface of the composite roller, and the recessed portion is a groove formed by the outer circumferential surface of the composite roller being recessed inward.

[0009] Optionally, the first lamination portion is an anti-sticking film, which is adhered to the outer circumferential surface of the composite roller. In the circumferential direction of the composite roller, two ends of the anti-sticking film are spaced apart to form the recessed portion, or two adjacent anti-sticking films are spaced apart to form the recessed portion.

[0010] Optionally, it also includes: a film sticking mechanism, which is arranged on the outer peripheral side of the composite roller and is used to stick the anti-sticking film on the outer peripheral surface of the composite roller; and a cutting mechanism, which is arranged on the outer peripheral side of the composite roller and is used to cut the anti-sticking film.

[0011] Optionally, the multiple composite rollers include a first roller and a second roller, the outer circumferential surface of the first roller is provided with the first pressing portion and the second pressing portion, the first pressing portion cooperates with the outer circumferential surface of the second roller to roll the composite part to composite the material on the first sheet to the second sheet, and the second pressing portion cooperates with the outer circumferential surface of the second roller to roll the part to be composited to retain the material on the first sheet.

[0012] Optionally, the first pressing portion and the second pressing portion are provided on the outer peripheral surface of each of the composite rollers, and the first pressing portions on the two composite rollers arranged in a pair are correspondingly arranged and cooperate to roll the composite part to composite the material on the first sheet to the second sheet, and the second pressing portions on the two composite rollers arranged in a pair are correspondingly arranged and cooperate to roll the composite part to retain the material on the first sheet.

[0013] Optionally, the laminating device also includes: a segmentation mechanism, which is arranged upstream of the composite roller group, and is used to segment the material on the first sheet into a first material segment 31 with a length of a and a second material segment 32 with a length of b. In the length direction of the first sheet, the first material segment 31 and the second material segment 32 are arranged alternately, and the arc length of the first pressing part is equal to a, and the arc length of the second pressing part is equal to b.

[0014] Optionally, the laminating device also includes: a first unwinding roller, which is used to release the first sheet covered with material to the composite roller group; a second unwinding roller, which is used to release the second sheet to the composite roller group; a first winding roller, which is used to wind up the first sheet; and a second winding roller, which is used to wind up the composite part after lamination.

[0015] Optionally, the number of the first unwinding roller and the first winding roller are two respectively, the second sheet released by the second unwinding roller is located between the first sheets released by the two first unwinding rollers, and the composite part wound up by the second winding roller is located between the first sheets wound up by the two first winding rollers.

[0016] According to a second aspect of the utility model, a coating system is provided, comprising the coating device described in any one of the above embodiments.

[0017] According to the laminating device of the utility model, a first pressing part and a second pressing part are arranged on at least one of the two composite rollers. By utilizing the larger pressure of the first pressing part during rolling and the smaller pressure of the recessed part as the second pressing part, a high-pressure area and a low-pressure area can be formed in the circumferential direction of the composite roller, so that the material on the first sheet can be compounded to the second sheet after the composite part is rolled by the first pressing part, and the material on the first sheet can be retained on the first sheet after the composite part is rolled by the second pressing part, so that the material can be intermittently compacted on the second sheet to form a composite part, so that when cutting the composite part, the cutter can be prevented from adhering to the material and causing the cutter to become blunt, thereby causing burrs to form on the edge of the second sheet, affecting the yield rate of the composite part, and thus can be better suitable for the lamination process.

[0018] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0020] Figure 1 It is a schematic diagram of preparing negative electrode plates by a coating system in the prior art;

[0021] Figure 2 It is a schematic diagram of preparing a negative electrode sheet according to a coating system of an embodiment provided by the utility model;

[0022] Figure 3 It is a schematic diagram of the first sheet after the segmentation mechanism in the laminating device according to an embodiment of the utility model is pressed;

[0023] Figure 4 is a schematic diagram of a laminating device according to an embodiment of the utility model;

[0024] Figure 5 It is a schematic diagram of two composite rollers rolling a composite member in a laminating device according to an embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of two composite rollers in a laminating device according to an embodiment of the utility model;

[0026] Figure 7 It is a schematic diagram of a first roller in a laminating device according to an embodiment of the utility model.

[0027] Reference numerals

[0028] Laminating device 100; first sheet material 1; second sheet material 2; material 3; first material section 31; second material section 32; composite part 4; existing composite part 4a; cutter 200; composite roller 10; first roller 11; second roller 12; first pressing part 13; second pressing part 14; laminating mechanism 20; cutting mechanism 30; segmenting mechanism 40; first unwinding roller 50; second unwinding roller 60; first winding roller 70; second winding roller 80; over roller 90. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] In the prior art, such as Figure 1 As shown, when the coating system prepares the negative electrode sheet, it will continuously coat the two sides of the copper foil to form a continuous lithium-rich layer on both sides of the copper foil, thereby forming the existing composite part 4a. When the existing composite part 4a is used in the lamination process, the cutter 200 frequently cuts off the negative electrode sheet, which will cause the cutter 200 to stick to lithium, and then make the blade blunt, resulting in burrs on the cut edge of the copper foil. For batteries produced from negative electrode sheets with burrs, when the burrs pierce the diaphragm, it will cause a short circuit between the positive and negative electrodes, causing the battery to heat up or even explode, thereby endangering the personal safety of the user. Therefore, the existing coating system cannot be used in the lamination process.

[0035] The following first describes in detail the coating device 100 according to the embodiment of the utility model with reference to the drawings.

[0036] like Figures 2 to 7 As shown, the laminating device 100 according to the embodiment of the present invention includes a composite roller set.

[0037] Specifically, the composite roller group includes a plurality of composite rollers 10, the plurality of composite rollers 10 are arranged in pairs, a first pressing portion 13 and a second pressing portion 14 are provided on the outer peripheral surface of at least one of the plurality of composite rollers 10, the first pressing portion 13 and the second pressing portion 14 are arranged along the circumferential direction of the composite roller 10, the first pressing portion 13 and the second pressing portion 14 extend along the axis of the composite roller 10 respectively, and the second pressing portion 14 is a recessed portion.

[0038] In other words, the laminating device 100 according to the embodiment of the utility model is mainly composed of a composite roller group. The composite roller group may include a plurality of composite rollers 10 arranged in pairs, and the composite rollers 10 arranged in pairs may roll the composite member. For example, the composite roller group may include two composite rollers 10, or may include four composite rollers 10, and the four composite rollers 10 may be arranged opposite to each other in pairs, so the number of composite rollers 10 in the composite roller group is not limited here.

[0039] The axes of the multiple composite rollers 10 can be parallel to each other, and the multiple composite rollers 10 can be arranged along their own radial direction, and the composite part can pass through the composite rollers 10 arranged in pairs. The two composite rollers 10 arranged in pairs can rotate in opposite directions around their own axes to roll the composite part.

[0040] The composite part may include a first sheet 1 and a second sheet 2. The first sheet 1 may be a material film, and the material film may be covered with a material 3, and the material 3 may be arranged on the side of the material film facing the second sheet 2. After the composite part is rolled by the composite roller 10, the material 3 on the material film may be separated from the first sheet 1 and composited with the second sheet 2 to form a composite part 4. For example, the material 3 may be metallic lithium, the material film may be a PET film, the metallic lithium may be carried on the PET film, and the second sheet 2 may be a copper foil. After being rolled by the composite roller group, the metallic lithium may be composited on the surface of the copper foil to form a lithium-rich layer.

[0041] Optionally, the composite member to be assembled may include a first sheet 1 and a second sheet 2, and the composite member 4 formed by rolling may include a copper foil and a lithium-rich layer. At this time, in order to generate a negative electrode sheet, the composite member 4 and another first sheet 1 may be rolled again through another composite roller group to coat the other side of the copper foil with lithium.

[0042] In some other optional embodiments, the composite member to be assembled may include two first sheets 1 and one second sheet 2, and the composite member 4 formed by rolling may include a layer of copper foil and lithium-rich layers disposed on both sides of the copper foil.

[0043] In addition, a first nip portion 13 and a second nip portion 14 are provided on the outer circumferential surface of one or more of the plurality of composite rollers 10. For the composite roller 10 provided with the first nip portion 13 and the second nip portion 14, the first nip portion 13 and the second nip portion 14 are arranged along the circumferential direction of the composite roller 10, and the first nip portion 13 and the second nip portion 14 extend along the circumferential direction of the composite roller 10 respectively.

[0044] In the axial direction of the composite roller 10, the length of the first pressing portion 13 is not less than the width of the material 3 on the first sheet 1, and the length of the second pressing portion 14 is not less than the width of the material 3 on the first sheet 1. The width of the material 3 on the first sheet 1 can be the distance between the two ends of the material 3 in the axial direction of the composite roller 10.

[0045] During the process of the composite roller group rolling the composite part, when the first pressing part 13 rolls the composite part, the pressure exerted by the first pressing part 13 on the composite part can be F1, and when the second pressing part 14 rolls the composite part, the pressure exerted by the second pressing part 14 on the composite part can be F2.

[0046] The second pressing portion 14 is a recessed portion, whereby the recessed portion can form a zero pressure zone on the surface of the composite roller 10. When the recessed portion rolls the component to be composited, the inner surface of the recessed portion can be spaced apart from the component to be composited, so that the pressure F2 applied by the recessed portion to the component to be composited is smaller than F1, so that a high pressure zone is formed at the composite roller 10 where the first pressing portion 13 is provided, and a low pressure zone is formed at the composite roller 10 where the second pressing portion 14 is provided.

[0047] The pressure F1 is relatively large, so that the material 3 on the first sheet 1 can be compounded to the second sheet 2. The pressure F2 is relatively small, which is not enough to compound the material 3 on the first sheet 1 to the second sheet 2, so that the material 3 on the first sheet 1 remains on the first sheet 1, and this part of the material 3 is prevented from being compounded to the second sheet 2. Therefore, under the rolling pressure of the compounding roller 10, the material 3 on the first sheet 1 can be intermittently compounded to the second sheet 2, thereby forming a composite member 4.

[0048] Optionally, the recessed portion can be directly formed by the outer circumferential surface of the composite roller 10 being recessed inwardly, or by adding an outwardly protruding structure on the surface of the composite roller 10 to form the first pressing portion 13, and then forming an inwardly recessed recessed portion on the first pressing portion 13, which is not limited here.

[0049] It should be noted that the size of F2 can be set according to actual needs, as long as the material 3 is not pressed on the surface of the second sheet 2. Optionally, F2 can be 0, so that a zero pressure zone is formed where the second pressing portion 14 of the composite roller 10 is provided.

[0050] like Figure 2As shown, in the composite part 4, the surface of the copper foil is provided with a plurality of materials 3 spaced apart along the length direction of the first sheet 1, and the cutter 200 can cut the first sheet 1 from between two adjacent materials 3 to meet the production requirements of the lamination process. In other words, the cutter 200 can cut the copper foil in the copper foil collector area not covered with lithium, avoiding the cutter 200 from sticking lithium, which is beneficial to improving the yield rate of the negative electrode sheet and improving the safety of the battery, while ensuring the lithium content of the negative electrode sheet, thereby ensuring the capacity of the battery.

[0051] It should be noted that the coating device 100 of this embodiment can be used not only in the lithium battery industry, but also in other film-forming related industries, and is applicable to composite parts 4 that require the material 3 to be composited from the first sheet 1 to the second sheet 2.

[0052] Therefore, according to the laminating device 100 of the embodiment of the utility model, a first pressing part 13 and a second pressing part 14 are arranged on at least one of the multiple composite rollers 10. By utilizing the larger pressure of the first pressing part 13 during rolling and the smaller pressure of the recessed part of the second pressing part 14, a high-pressure area and a low-pressure area can be formed in the circumferential direction of the composite roller 10, so that the material 3 on the first sheet 1 can be compounded to the second sheet 2 after the composite part is rolled by the first pressing part 13, and the material 3 on the first sheet 1 can remain on the first sheet 1 after the composite part is rolled by the second pressing part 14, so that the material 3 can be intermittently compacted on the second sheet 2 to form a composite part 4, so that when cutting the composite part 4, the cutter 200 is prevented from adhering to the material 3 and causing the cutter 200 to become blunt, thereby causing burrs to form on the edge of the second sheet 2, affecting the yield rate of the composite part 4, and therefore it can be better suitable for the lamination process.

[0053] In some optional embodiments, F2 can be 0, so the low pressure zone can be a zero pressure zone, and the second lamination section 14 can roll the composite part without applying pressure to the composite part, so that the material 3 on the first sheet 1 remains on the first sheet 1, avoiding this part of the material 3 from being compounded to the second sheet 2.

[0054] According to one embodiment of the utility model, at least two first pressing parts 13 are provided on the composite roller 10, the number of the second pressing parts 14 is equal to the number of the first pressing parts 13, and the at least two first pressing parts 13 and the at least two second pressing parts 14 are arranged alternately along the circumference of the composite roller 10.

[0055] Specifically, for the composite roller 10 provided with the first pressing part 13 and the second pressing part 14, the number of the first pressing part 13 and the second pressing part 14 on the outer circumferential surface thereof can be N respectively, and N can be an integer ≥ 2. The N first pressing parts 13 and the N second pressing parts 14 can be arranged alternately along the circumference of the composite roller 10. In other words, in the circumference of the composite roller 10, the second pressing part 14 is provided between two adjacent first pressing parts 13, and the first pressing part 13 is provided between two adjacent second pressing parts 14.

[0056] In this embodiment, a plurality of first pressing portions 13 and second pressing portions 14 are alternately arranged on the outer peripheral surface of the composite roller 10. During one rolling circle of the composite roller 10, the material 3 on the first sheet 1 can be intermittently compounded twice to form a composite part 4 that is sufficient to be cut into two negative electrode sheets, which is beneficial to improving the efficiency of the coating device 100.

[0057] In addition, the number of the first pressing part 13 and the second pressing part 14 is related to the length of the negative electrode sheet. The smaller the length of the negative electrode sheet, the more the number of the first pressing part 13 and the second pressing part 14 can be set on the single composite roller 10. The number of the first pressing part 13 and the second pressing part 14 is also related to the diameter of the composite roller 10. The larger the diameter of the composite roller 10, the more the number of the first pressing part 13 and the second pressing part 14 can be set on the single composite roller 10.

[0058] In some specific embodiments of the present invention, arc lengths of at least two of the first pressing portions 13 are equal, and arc lengths of at least two of the second pressing portions 14 are equal.

[0059] Specifically, the first lamination portion 13 and the second lamination portion can extend respectively along the circumference of the composite roller 10. For the composite roller 10 provided with the first lamination portion 13 and the second lamination portion 14, the arc lengths of the N first lamination portions 13 on the composite roller 10 are equal, and the arc lengths of the N second lamination portions 14 are also equal, so that under the action of the equal-length first lamination portions 13, the length of each section of the material laminated to the second sheet 2 in the composite part can be equal, and at the same time, under the action of the equal-length second lamination portions 14, the gaps between any two adjacent sections of the material in the composite part are also equal, which facilitates the subsequent equidistant cutting of the composite part.

[0060] In some specific embodiments of the present invention, the first pressing portion 13 is the outer peripheral surface of the composite roller 10 , and the recessed portion is a groove formed by the outer peripheral surface of the composite roller 10 being recessed inwardly.

[0061] Specifically, the outer circumference of the composite roller 10 can be formed as the first pressing portion 13, and the recessed portion can be a groove, which can be formed by directly recessing the outer circumference of the composite roller 10. Therefore, the composite device of this embodiment can be obtained by processing by grooving the outer circumference of the existing composite roller, and the structure is simple and easy to manufacture.

[0062] According to some optional embodiments of the utility model, the first lamination portion 13 is an anti-sticking film, which is adhered to the outer peripheral surface of the composite roller 10. In the circumferential direction of the composite roller 10, the two ends of the anti-sticking film are spaced apart to form a recessed portion, or two adjacent anti-sticking films are spaced apart to form a recessed portion.

[0063] Specifically, a release film may be attached to the outer circumferential surface of the composite roller 10, and the release film may be formed into the first lamination portion 13. In the axial direction of the composite roller 10, the width of the release film may be not less than the width of the material 3 on the first sheet 1. The release film may be wrapped around the composite roller 10 along its circumferential direction.

[0064] The anti-adhesive film can play a role of protection and isolation on the composite roller 10. During the composite process, the material will not adhere to the anti-adhesive film, thereby preventing the material from adhering to the composite roller 10 during the composite process, resulting in uneven composite of the material. When the material is metallic lithium, the anti-adhesive film can prevent lithium from sticking.

[0065] When the number of the first pressing parts 13 is one, an anti-sticking film can be provided on the outer circumferential surface of the composite roller 10, and the two ends of the anti-sticking film can be spaced apart in the circumferential direction of the composite roller 10, and the end surfaces at both ends of the anti-sticking film and the outer circumferential surface of the composite roller 10 can cooperate to form a recessed portion.

[0066] When there are multiple first pressing parts 13, multiple anti-sticking films can be provided on the outer circumferential surface of the composite roller 10. In the circumferential direction of the composite roller 10, two adjacent anti-sticking films can be spaced apart, and the end surface between the two adjacent anti-sticking films and the outer circumferential surface of the composite roller 10 can cooperate to form a recessed portion.

[0067] The curvature of the anti-sticking film is equal to the length of the negative electrode sheet cut by the lamination process, and the gaps at both ends of the anti-sticking film or between adjacent anti-sticking films are equal to the gaps between adjacent materials 3 on the composite part 4 .

[0068] In this embodiment, the first pressing portion 13 is set as an anti-sticking film. The existing coating device can be transformed into the coating device 100 of this embodiment by sticking the anti-sticking film on the outer peripheral surface of the existing composite roller. The structure is simple and will not cause damage to the composite roller 10. It has the advantages of low cost and easy implementation.

[0069] In some optional embodiments, the anti-adhesion film may include an adhesive tape, which may be bonded to the outer peripheral surface of the composite roller 10, and the outer surface of the adhesive tape may prevent lithium from sticking. The adhesive tape on the composite roller 10 may be torn off for conventional rolling, or replaced with an adhesive tape of other lengths to meet the length requirements of different negative electrode sheets.

[0070] According to some other embodiments of the present invention, the laminating device 100 further includes: a film laminating mechanism 20 and a cutting mechanism 30 .

[0071] The film sticking mechanism 20 is disposed on the outer peripheral side of the composite roller 10, and is used to stick the anti-adhesion film on the outer peripheral surface of the composite roller 10. The cutting mechanism 30 is disposed on the outer peripheral side of the composite roller 10, and is used to cut the anti-adhesion film.

[0072] Specifically, a film laminating mechanism 20 may be provided on the outer peripheral side of the composite roller 10, and the film laminating mechanism 20 may automatically apply film to the outer peripheral side of the composite roller 10, and the cutting mechanism 30 may cut the anti-sticking film at an appropriate position so that the curvature of the anti-sticking film on the composite roller 10 is equal to the length of the negative electrode sheet to be produced.

[0073] like Figure 4 As shown, the film laminating mechanism 20 may include an anti-sticking film unwinding assembly and a roller. The anti-sticking film unwinding assembly may unwind the anti-sticking film toward the composite roller 10, and the roller may press the anti-sticking film roller onto the outer peripheral surface of the composite roller 10. The cutting mechanism 30 may be arranged corresponding to the film laminating mechanism 20. The cutting mechanism 30 may include a blade, the tip of the blade may face the outer peripheral surface of the composite roller 10, and the blade may cut off the anti-sticking film.

[0074] In this embodiment, the film laminating mechanism 20 and the cutting mechanism 30 cooperate to automatically laminate the surface of the composite roller 10 , which is beneficial to improving the reliability of laminating, reducing the time of laminating and changing the glue, and improving the efficiency of the laminating device 100 .

[0075] In some optional embodiments, the blade in the cutting mechanism 30 can scrape off the anti-sticking film on the surface of the composite roller 10, and then re-attach the anti-sticking film on the surface of the composite roller 10 through the film pasting mechanism 20, thereby changing the curvature of the anti-sticking film on the composite roller 10, thereby adjusting the length of the negative electrode sheet at the generated location.

[0076] In some specific embodiments of the present invention, multiple composite rollers 10 include a first roller 11 and a second roller 12. The outer peripheral surface of the first roller 11 is provided with a first pressing portion 13 and a second pressing portion 14. The first pressing portion 13 cooperates with the outer peripheral surface of the second roller 12 to roll the composite part to be composited so as to composite the material 3 on the first sheet 1 to the second sheet 2. The second pressing portion 14 cooperates with the outer peripheral surface of the second roller 12 to roll the composite part to retain the material 3 on the first sheet 1.

[0077] Specifically, there are two composite rollers 10 in the coating device. For the sake of convenience, the two composite rollers 10 can be defined as a first roller 11 and a second roller 12. A first pressing portion 13 and a second pressing portion 14 are provided on the outer circumferential surface of the first roller 11, and the outer circumferential surface of the second roller 12 can be a smooth circular surface.

[0078] In the process of rolling the part to be composited by the first roller 11 and the second roller 12, when the first laminating section 13 cooperates with the second roller 12 to roll the part to be composited, the first laminating section 13 and the second roller 12 press the part to be composited to composite the material 3 on the first sheet 1 to the second sheet 2. When the second laminating section 14 cooperates with the second roller 12 to roll the part to be composited, the outer circumferential surfaces of the second laminating section 14 and the second roller 12 are spaced apart to form a zero pressure area, at which time the material 3 on the first sheet 1 corresponding to the second laminating section 14 can be retained on the first sheet 1 without being composited to the second sheet 2, thereby, by alternately rolling the part to be composited by the first laminating section 13 and the second laminating section 14, the material 3 can be intermittently composited on the second sheet 2 to generate a composite 4 suitable for the lamination process.

[0079] In this embodiment, the first pressing part 13 and the second pressing part 14 are only provided on one composite roller 10 , which is beneficial to reducing the cost of the laminating device 100 while enabling intermittent lamination.

[0080] According to some optional embodiments of the utility model, a first pressing portion 13 and a second pressing portion 14 are provided on the outer peripheral surface of each composite roller 10, and the first pressing portions 13 on the two composite rollers 10 arranged in a pair are correspondingly arranged and cooperate to roll the parts to be composited so as to composite the material 3 on the first sheet 1 to the second sheet 2, and the second pressing portions 14 on the two composite rollers 10 arranged in a pair are correspondingly arranged and cooperate to roll the parts to be composited so as to retain the material 3 on the first sheet 1.

[0081] Specifically, each composite roller 10 may be provided with a first pressing portion 13 and a second pressing portion 14. During the rotation of the two composite rollers 10 arranged in a pair, the first pressing portions 13 on the two composite rollers 10 are opposite to each other, and the second pressing portions 14 on the two composite rollers 10 are opposite to each other.

[0082] In the process of rolling the workpiece to be composited by the two composite rollers 10 arranged in a pair, the first pressing parts 13 on the two composite rollers 10 can roll the workpiece to be composited together, so as to composite the material 3 on the rolled first sheet 1 to the second sheet 2, and the second pressing parts 14 on the two composite rollers 10 can roll the workpiece to be composited together, so as to form zero pressure zones on both sides of the workpiece to be composited. In the case of composite material 3 on both sides of the second sheet 2, second pressing parts 14 are respectively provided on the two composite rollers 10 arranged in a pair, so as to avoid excessive pressure on any side of the workpiece to be composited, which may cause the material 3 to be composited to the second sheet 2, and is beneficial to improving the yield of the composite part 4.

[0083] According to some other embodiments of the utility model, the laminating device 100 also includes: a segmenting mechanism 40, which is arranged upstream of the composite roller group, and the segmenting mechanism 40 is used to segment the material on the first sheet 1 into a first material segment 31 with a length of a and a second material segment 32 with a length of b. In the length direction of the first sheet 1, the first material segment 31 and the second material segment 32 are arranged alternately, the arc length of the first pressing portion 13 is equal to a, and the arc length of the second pressing portion 14 is equal to b.

[0084] Specifically, in the conveying direction of the first sheet material 1 , a segmenting mechanism 40 may be provided upstream of the composite roller group. The segmenting mechanism 40 may be provided corresponding to the first sheet material 1 , and the first sheet material 1 may pass through the segmenting mechanism 40 .

[0085] The material strip is distributed in a strip shape on the first sheet 1, and the segmentation mechanism 40 can stagger the material on the first sheet 1 into two material segments, namely the first material segment 31 and the second material segment 32. The length of the first material segment 31 is a, and the length of the second material segment 32 is b. The first material segment 31 and the second material segment 32 can be staggered in the length direction of the first sheet 1, that is, the second material segment 32 can be arranged between adjacent first material segments 31.

[0086] The segmentation method of the segmentation mechanism 40 may include but is not limited to making indentations on the material of the first sheet 1 and cutting the material on the first sheet 1. After segmentation, the first material segment 31 and the second material segment 32 may be completely disconnected or not completely disconnected, which is not limited here.

[0087] like Figure 3 As shown, the segmentation mechanism 40 makes indentations on the first sheet 1, so that the material 3 on the first sheet 1 forms an indentation group at a distance a. In other words, the distance between two adjacent indentation groups is a, each indentation group may include two indentations, and the distance between the two indentations in each indentation group is b. The material 3 on the first sheet 1 is more easily separated at the indentations, the first material segment 31 and the second material segment 32.

[0088] The arc length of the first pressing part 13 can be equal to a, so the material 3 between adjacent pressing groups can be compounded to the second sheet 2. The arc length of the second pressing part 14 can be equal to b, so the material 3 on the first sheet 1 can be disconnected at the indentation, and the material 3 between two indentations in each indentation group can be retained on the first sheet 1 without being compounded to the second sheet 2. In the final compounded composite 4, the length of each section of the material 3 is a.

[0089] like Figure 6 As shown, two anti-sticking films may be provided on the outer circumferential surface of the first roller 11, the arc lengths of the two anti-sticking films are arc length AB and arc length CD respectively, arc length AB=arc length CD=a, and the gap between the two anti-sticking films is d, d=b.

[0090] In this embodiment, a segmentation mechanism 40 is provided to segment the material 3 on the first sheet 1 into two material segments, so that the material 3 on the first sheet 1 can be more easily disconnected at the junction of the first pressing portion 13 and the second pressing portion 14, thereby preventing the material 3 rolled by the second pressing portion 14 from being compounded with the second sheet 2, thereby preventing the material 3 from remaining at the cutting position when cutting the composite part 4 and adhering to the cutter 200, causing the cutter 200 to become blunt, thereby causing burrs to form on the edge of the second sheet 2, affecting the yield rate of the composite part 4, and thus being better suitable for the lamination process.

[0091] In some specific embodiments of the present invention, the laminating device 100 further includes: a first unwinding roller 50, a second unwinding roller 60, a first winding roller 70, and a second winding roller 80. The first unwinding roller 50 is used to release the first sheet material 1 coated with the material 3 to the composite roller group. The second unwinding roller 60 is used to release the second sheet material 2 to the composite roller group. The first winding roller 70 is used to wind up the first sheet material 1. The second winding roller 80 is used to wind up the composite member 4 after lamination.

[0092] Specifically, in the conveying direction, the first unwinding roller 50 and the second unwinding roller 60 may be disposed upstream of the composite roller group, and the first winding roller 70 and the second winding roller 80 may be disposed downstream of the composite roller group.

[0093] The first unwinding roller 50 can release the first sheet 1 downstream, the segmentation mechanism 40 can be arranged between the first unwinding roller 50 and the composite roller group, and the second unwinding roller 60 can release the second sheet 2 to the composite roller group. The first winding roller 70 can wind up the first sheet 1, and the wound first sheet 1 has residual material 3, which can be recycled after winding up. The second winding roller 80 can wind up the composite part 4, and the material 3 on the wound composite part 4 is intermittently arranged.

[0094] A passing roller 90 may also be provided between the first unwinding roller 50 and the composite roller group, between the second unwinding roller 60 and the composite roller group, between the first winding roller 70 and the composite roller group, and between the second winding roller 80 and the composite roller group for guiding the conveyance of the first sheet 1, the second sheet 2 or the composite part 4.

[0095] In this embodiment, two unwinding rollers and two winding rollers are provided to realize automatic lamination, which is beneficial to improving the lamination efficiency.

[0096] In some optional implementations, the number of the first unwinding roller 50 and the first winding roller 70 can be one, in which case the coating device 100 can perform single-sided lamination, that is, laminating materials on one side of the second sheet 2. When producing pole pieces, the coating device 100 can coat lithium on one side of the copper foil.

[0097] According to some optional embodiments of the present invention, the number of the first unwinding roller 50 and the first winding roller 70 are respectively two, the second sheet 2 released by the second unwinding roller 60 is located between the first sheets 1 released by the two first unwinding rollers 50, and the composite part 4 wound up by the second winding roller 80 is located between the first sheets 1 wound up by the two first winding rollers 70.

[0098] Specifically, the laminating device 100 of this embodiment may include two first unwinding rollers 50 and two first winding rollers 70 , the second unwinding roller 60 may be located between the two first unwinding rollers 50 , and the second winding roller 80 may be located between the two first winding rollers 70 .

[0099] The two first unwinding rollers 50 can release the first sheet 1 respectively, and the second sheet 2 can be located between the two first sheets 1. Thus, when the composite roller assembly 4 is composited, the two sides of the second sheet 2 can be composited with the material 3 respectively. After the composite is completed, the two first sheets 1 with the participating materials 3 can be respectively rolled up by the two first winding rollers 70.

[0100] In this embodiment, two first unwinding rollers 50 and two second unwinding rollers 60 are provided respectively, so that the material 3 can be intermittently compounded on both sides of the second sheet 2 at the same time, which is beneficial to improving production efficiency. A relatively set gap can also be formed on both sides of the second sheet 2. Therefore, when the cutter 200 cuts from the gap during the lamination process, the cutter 200 only cuts the second sheet 2 without sticking to the material 3.

[0101] The present invention also provides a coating system, which includes a coating device 100 according to any of the above embodiments. The coating system can cut the composite part 4 by a lamination process to support the negative electrode sheet.

[0102] Since the coating device 100 according to the embodiment of the utility model has the above-mentioned technical effects, the coating system according to the embodiment of the utility model also has the corresponding technical effects, that is, it can realize intermittently compacting the material 3 on the second sheet 2 to form a composite part 4, so as to avoid the cutter 200 sticking to the material 3 and causing the cutter 200 to become blunt when cutting the composite part 4, thereby causing burrs to form on the edge of the second sheet 2, affecting the yield rate of the composite part 4, and therefore can be better suitable for the lamination process.

[0103] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A coating device, characterized in that: include: A composite roller group, wherein the composite roller group comprises a plurality of composite rollers, wherein the plurality of composite rollers are arranged in pairs, and a first pressing portion and a second pressing portion are provided on the outer circumferential surface of at least one of the plurality of composite rollers, wherein the first pressing portion and the second pressing portion are arranged along the circumferential direction of the composite roller, and the first pressing portion and the second pressing portion extend respectively along the axis of the composite roller, and the second pressing portion is a recessed portion.

2. The coating device according to claim 1, characterized in that: At least two of the first pressing parts are provided on the composite roller, the number of the second pressing parts is equal to the number of the first pressing parts, and at least two of the first pressing parts and at least two of the second pressing parts are staggered along the circumference of the composite roller.

3. The coating device according to claim 2, characterized in that: The arc lengths of at least two of the first pressing parts are equal, and the arc lengths of at least two of the second pressing parts are equal.

4. The coating device according to claim 1, characterized in that: The first pressing portion is the outer circumferential surface of the composite roller, and the recessed portion is a groove formed by the outer circumferential surface of the composite roller being recessed inward.

5. The coating device according to claim 1, characterized in that: The first lamination portion is an anti-sticking film, which is adhered to the outer circumferential surface of the composite roller. In the circumferential direction of the composite roller, two ends of the anti-sticking film are spaced apart to form the recessed portion, or two adjacent anti-sticking films are spaced apart to form the recessed portion.

6. The coating device according to claim 5, characterized in that: Also includes: A film sticking mechanism, which is arranged on the outer peripheral side of the composite roller and is used to stick the anti-sticking film on the outer peripheral surface of the composite roller; A cutting mechanism is arranged on the outer peripheral side of the composite roller and is used for cutting the anti-sticking film.

7. The coating device according to claim 1, characterized in that: The multiple composite rollers include a first roller and a second roller, the first roller is provided with the first pressing portion and the second pressing portion on the outer peripheral surface, the first pressing portion cooperates with the outer peripheral surface of the second roller to roll the component to be composited so as to composite the material on the first sheet to the second sheet, and the second pressing portion cooperates with the outer peripheral surface of the second roller to roll the component to be composited so as to retain the material on the first sheet.

8. The coating device according to claim 1, characterized in that: The first pressing portion and the second pressing portion are arranged on the outer peripheral surface of each of the composite rollers. The first pressing portions on the two composite rollers arranged in a pair are arranged correspondingly and cooperate to roll the parts to be composited so as to composite the material on the first sheet to the second sheet. The second pressing portions on the two composite rollers arranged in a pair are arranged correspondingly and cooperate to roll the parts to be composited so as to retain the material on the first sheet.

9. The coating device according to claim 1, characterized in that: Also includes: A segmentation mechanism, the segmentation mechanism is arranged upstream of the composite roller group, and the segmentation mechanism is used to segment the material on the first sheet into a first material segment (31) with a length a and a second material segment (32) with a length b. In the length direction of the first sheet, the first material segment (31) and the second material segment (32) are arranged alternately, and the arc length of the first pressing part is equal to a, and the arc length of the second pressing part is equal to b.

10. The coating device according to claim 1, characterized in that: Also includes: A first unwinding roller, the first unwinding roller is used to release a first sheet covered with a material to the composite roller group; a second unwinding roller, the second unwinding roller being used for releasing a second sheet material to the composite roller group; a first winding roller, the first winding roller being used for winding up the first sheet; The second winding roller is used for winding the composite part after compounding.

11. The coating device according to claim 10, characterized in that: There are two first unwinding rollers and two first winding rollers respectively, the second sheet released by the second unwinding roller is located between the first sheets released by the two first unwinding rollers, and the composite part wound up by the second winding roller is located between the first sheets wound up by the two first winding rollers.

12. A film coating system, characterized in that: include: The coating device according to any one of claims 1 to 11.

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