Coating device, coating method and battery manufacturing equipment

Abstract

The embodiment of the invention provides a coating device, a coating method and battery manufacturing equipment. The coating device sequentially comprises an unwinding unit, a laminating unit and a coating unit, the unwinding unit comprises a first unwinding unit and a second unwinding unit, the first unwinding unit is used for providing a pole piece, and the pole piece is provided with a coating surface; the second unwinding unit is used for providing an isolation belt, and the attaching unit is used for attaching the isolation belt to a pole piece; the coating unit is arranged at the downstream of the laminating unit along the belt running direction of the isolation belt, and the coating unit is used for coating slurry towards the isolation belt on the pole piece; hollowed-out holes are formed in the isolation belt, the isolation belt is used for preventing slurry from being coated on the coating surface of the pole piece, and the slurry coated by the coating unit is coated on the pole piece through the hollowed-out holes to form a film coating area. According to the technical scheme provided by the invention, the risks of coating bulge and tail trailing of the pole piece can be reduced, and the coating quality of the pole piece is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular, to a coating device, a coating method and a battery manufacturing equipment. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] During the manufacturing process of batteries, pole piece coating is an important process. At present, in the gap coating process of pole pieces, there are coating areas and blank areas on the pole pieces. The coating machine generally controls the gap of the blank area of ​​the pole piece through a gap valve, and the pole piece is prone to coating bulges and tail dragging. Summary of the invention

[0004] The present application provides a coating device, a coating method and a battery manufacturing device, which can reduce the risk of coating protrusions and tail dragging of the pole piece and improve the coating quality of the pole piece.

[0005] This application is achieved through the following technical solutions: In the first aspect, an embodiment of the present application provides a coating device, which comprises a unwinding unit, a bonding unit and a coating unit in sequence, the unwinding unit comprising a first unwinding unit and a second unwinding unit, the first unwinding unit being used to provide a pole piece, the pole piece having a coating surface; the second unwinding unit being used to provide an isolation tape, the bonding unit being used to bond the isolation tape to the pole piece; along the tape running direction of the isolation tape, the coating unit is arranged downstream of the bonding unit, the coating unit being used to coat slurry toward the isolation tape on the pole piece; wherein hollow holes are provided on the isolation tape, the isolation tape being used to block the slurry from being coated on the coating surface of the pole piece, the hollow holes being used for the slurry coated by the coating unit to be coated on the pole piece to form a coating area.

[0006] In the technical solution of the embodiment of the present application, an isolation tape is provided by a second unwinding unit, and a hollow hole is arranged on the isolation tape. Before coating the electrode, the coating unit bonds the isolation tape to the coating surface of the electrode through a bonding unit. The coating unit coats the isolation tape on the electrode, and the slurry coated by the coating unit at least covers the hollow holes of the isolation tape. The positions of the hollow holes correspond to the positions of the coating areas on the electrode. The isolation tape itself can block the slurry from being coated on the coating surface of the electrode, and the hollow holes can allow the slurry coated by the coating unit to be coated on the electrode. After separating the isolation belt from the pole piece, the area on the pole piece corresponding to the hollow holes on the isolation belt is the coating area of ​​the pole piece, that is, the shape of the hollow holes is the shape of the coating area, and the boundaries of the hollow holes on the isolation belt can limit the shape of the coating area on the pole piece. The hollow holes on the isolation belt can play a shaping role on the shape of the coating area of ​​the pole piece, so that the shape of the coating area on the pole piece and the slurry thickness are consistent, and the coating area on the pole piece is not prone to head bulges and tail tailing problems, which solves the problems of head bulges and tail tailing in the coating film area of ​​the existing conventional gap coating machine and improves the coating quality of the pole piece.

[0007] According to some embodiments of the present application, there are multiple hollow holes, and the multiple hollow holes are spaced apart along the length direction and / or width direction of the isolation zone.

[0008] In the above scheme, the number of hollow holes is set to be multiple, and the multiple hollow holes are spaced apart along the length direction and / or width direction of the isolation belt. After the coating unit applies slurry to the pole piece and the isolation belt, after the isolation belt is separated from the pole piece, multiple coating areas that match the shape of the hollow holes can be formed on the pole piece, realizing the assembly line coating operation. In addition, the spacing between two adjacent hollow holes on the isolation belt can be set according to the situation, so that the spacing of the coating areas coated on the pole piece by the coating unit can be set arbitrarily, thereby solving the problem that the spacing of the film areas of the pole piece in the prior art cannot be too small.

[0009] According to some embodiments of the present application, the shapes of the plurality of hollow holes are the same; or, the shapes of the plurality of hollow holes are partially the same.

[0010] In the above scheme, the shapes of the plurality of hollow holes may be the same or different, and the shape of the hollow holes on the isolation belt may be determined according to the actual situation and may be set according to the coating requirements of the coating area on the pole piece.

[0011] According to some embodiments of the present application, the coating device also includes an oven and a first winding unit. Along the conveying direction of the electrode sheet, the oven is arranged on the downstream side of the coating unit, and the oven is used to dry the slurry on the electrode sheet and / or the isolation belt after coating; the first winding unit is arranged on the downstream side of the oven, and the first winding unit is used to wind up the electrode sheet.

[0012] In the above scheme, the oven is arranged on the downstream side of the coating unit, and the oven can dry the slurry on the coated electrode and / or the isolation belt. The first winding unit is arranged on the downstream side of the oven, and the first winding unit can wind up the dried electrode to complete the winding process of the electrode.

[0013] According to some embodiments of the present application, the isolation tape is an adhesive tape, which includes adhesive paper and release paper along its thickness direction, the adhesive paper has an adhesive layer, and the release paper is attached to the adhesive layer of the adhesive paper; a second winding unit is arranged between the second unwinding unit and the laminating unit, and the second winding unit is used to separate the release paper on the isolation tape from the adhesive paper and to wind up the release paper.

[0014] In the above scheme, since the slurry has a certain fluidity after the coating unit coats the isolation tape on the pole piece, the rapid separation of the isolation tape from the pole piece may affect the molding quality of the coating area due to the flow of the slurry. The isolation tape is an adhesive tape, and a second winding unit is provided between the second unwinding unit and the laminating unit. After the second winding unit separates the release paper from the adhesive tape on the isolation tape, the adhesive tape is then fixed to the pole piece by the laminating unit. The bonding stability between the adhesive tape and the pole piece is higher, and the adhesive tape is not easy to fall off the pole piece. The coating unit coats the pole piece and the adhesive tape stably.

[0015] According to some embodiments of the present application, the laminating unit includes a laminating cylinder and a laminating roller. The laminating cylinder is used to drive the laminating roller to move closer to or away from the pole piece, and the laminating roller is used to laminating the adhesive paper separated from the release paper onto the pole piece.

[0016] In the above scheme, the glue pressing roller can stick the adhesive paper separated from the release paper on the coated surface of the electrode. Under the action of the glue sticking cylinder, the glue pressing roller can be driven close to or away from the electrode, so as to adjust the distance between the glue pressing roller and the roller for conveying the electrode, and then adjust the tightness of the fit between the adhesive paper and the electrode, so that the adhesive paper can be stuck to the electrode with a preset pressure, which can not only ensure the stability of the adhesive paper on the electrode, but also facilitate the subsequent separation of the adhesive paper and the electrode.

[0017] According to some embodiments of the present application, the coating device further includes a third winding unit, which is disposed between the oven and the first winding unit, and is used to separate the adhesive tape from the electrode and to wind up the adhesive tape.

[0018] In the above scheme, by arranging the third winding unit between the oven and the first winding unit, after the pole piece and the adhesive tape are dried in the oven, the slurry in the coating area on the pole piece has been solidified, and the third winding unit separates the adhesive tape dried in the oven from the pole piece, which will not affect the integrity of the slurry on the coating area of ​​the pole piece, and the forming quality of the coating area on the pole piece is better. The third winding unit can provide traction to the adhesive tape, separate the adhesive tape from the pole piece and rewind the adhesive tape.

[0019] According to some embodiments of the present application, the isolation tape has no adhesive layer, and the laminating unit is arranged adjacent to the coating unit; the coating device also includes a fourth winding unit, which is arranged between the coating unit and the oven, and is used to wind up the isolation tape on the electrode after coating.

[0020] In the above scheme, since the isolation tape is not sticky, the isolation tape cannot be transported for a long distance together with the pole piece. The laminating unit puts the isolation tape against the pole piece. By arranging the laminating unit and the coating unit adjacent to each other, the coating unit can immediately coat the isolation tape on the pole piece. The fourth winding unit is arranged between the coating unit and the oven. The fourth winding unit can directly wind up the coated isolation tape to complete the rapid separation of the isolation tape and the pole piece. The pole piece separated from the isolation tape then enters the oven for a drying process.

[0021] According to some embodiments of the present application, the laminating unit includes two relatively distributed clamping rollers, and the two clamping rollers are used to press the isolation tape against the coated surface of the pole piece.

[0022] In the above scheme, through the setting of two clamping rollers, the two clamping rollers can press the isolation tape against the coating surface of the pole piece, and can briefly press the isolation tape onto the pole piece, and then the coating unit coats the isolation tape on the pole piece to complete the coating of the coating area of ​​the pole piece.

[0023] According to some embodiments of the present application, the coating device further includes a first deviation correcting mechanism and a second deviation correcting mechanism, the first deviation correcting mechanism being arranged between the first unwinding unit and the laminating unit; the second deviation correcting mechanism being arranged between the second unwinding unit and the laminating unit.

[0024] In the above scheme, through the setting of the first correcting mechanism and the second correcting mechanism, the first correcting mechanism can center the pole piece and the second correcting mechanism can center the isolation belt. The first correcting mechanism and the second correcting mechanism cooperate with each other to align the isolation belt and the pole piece and center them, so that when the subsequent bonding unit bonds the isolation belt and the pole piece, the alignment accuracy of the isolation belt and the pole piece is high, and the isolation belt and the pole piece are not easily offset or misaligned.

[0025] In a second aspect, an embodiment of the present application further provides a battery manufacturing device, the battery manufacturing device comprising the coating device of any of the aforementioned embodiments.

[0026] On the third aspect, an embodiment of the present application further provides a coating method, which is based on the coating device of any of the aforementioned embodiments, and the coating method includes: attaching an isolation tape to the coating surface of the pole piece, coating slurry on the isolation tape of the pole piece, and separating the isolation tape from the pole piece.

[0027] In the above scheme, hollow holes are provided on the isolation belt. Before coating the electrode, the coating unit bonds the isolation belt to the coating surface of the electrode through the bonding unit. The coating unit coats the isolation belt on the electrode. The slurry coated by the coating unit at least covers the hollow holes of the isolation belt. The position of the hollow holes corresponds to the position of the coating area on the electrode. The isolation belt itself can block the slurry from being coated on the coating surface of the electrode, and the hollow holes can be used for the slurry coated by the coating unit to be coated on the electrode. After the isolation belt is separated from the electrode, the area on the electrode corresponding to the hollow holes on the isolation belt is the coating area of ​​the electrode, that is, the shape of the hollow holes is the shape of the coating area. The boundaries of the hollow holes on the isolation belt can limit the shape of the coating area on the electrode. The hollow holes on the isolation belt can play a role in shaping the shape of the coating area of ​​the electrode, so that the shape of the coating area on the electrode is consistent with the thickness of the slurry, and the coating area on the electrode is not prone to head bulges and tail dragging.

[0028] According to some embodiments of the present application, before the isolation tape is separated from the pole piece, the coated pole piece and the isolation tape are dried together in an oven, and then the isolation tape is separated from the pole piece.

[0029] In the above scheme, the electrode and the adhesive tape are dried in an oven together and then the adhesive tape is separated from the electrode. At this time, the slurry in the coating area of ​​the electrode has been solidified. In this way, the separation of the adhesive tape from the electrode will not affect the integrity of the slurry in the coating area of ​​the electrode, and the molding quality of the coating area of ​​the electrode is better.

[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the structure of a coating device provided in some embodiments of the present application; Figure 2 A schematic diagram of the structure of a coating device provided in some other embodiments of the present application; Figure 3 A schematic diagram of the structure of a pole piece provided by a first unwinding unit provided in some embodiments of the present application; Figure 4 A schematic diagram of the structure of an isolation belt provided by a first unwinding unit provided in some embodiments of the present application; Figure 5 A schematic diagram of a structure in which an isolation tape provided in some embodiments of the present application is attached to a pole piece; Figure 6 A schematic diagram of the structure after the coating unit according to some embodiments of the present application coats the isolation tape on the electrode piece; Figure 7 A schematic diagram of the structure of a pole piece after the isolation tape is separated from the pole piece after coating provided in some embodiments of the present application; Figure 8 A schematic diagram of the structure of an isolation belt provided by a first unwinding unit provided in some other embodiments of the present application; Fig. 9 A schematic diagram of a structure in which an isolation tape provided in some other embodiments of the present application is attached to a pole piece; Fig.10 A schematic diagram of the structure after coating the isolation tape on the electrode piece by the coating unit provided in other embodiments of the present application; Fig.11 A schematic diagram of the structure of a pole piece after the isolation belt is separated from the pole piece after coating provided in other embodiments of the present application; Fig.12 A schematic structural diagram of an isolation belt provided by a first unwinding unit provided in some further embodiments of the present application.

[0033] Icons: 100-coating device; 10-unwinding unit; 11-first unwinding unit; 111-first unwinding roller; 12-second unwinding unit; 121-second unwinding roller; 20-laminating unit; 21-gluing cylinder; 22-gluing roller; 23-nipping roller; 30-coating unit; 31-coating head; 32-back roller; 40-oven; 50-first winding unit; 51-second winding unit; 52-third winding unit Roll unit; 53-fourth winding unit; 54-first deviation-correcting mechanism; 55-second deviation-correcting mechanism; 56-dust collecting box; 57-glue-removing assembly; 60-pole piece; 61-film coating area; 70-isolation belt; 71-hollow hole; 72-adhesive tape; 721-adhesive paper; 722-release paper; 80-first over roller; 81-second over roller; 82-third over roller; 83-traction roller; X-width direction; Y-length direction. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0036] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0039] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0040] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0041] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0042] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0043] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material pole piece and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material pole piece (such as a pole piece of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0044] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0045] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0046] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used.

[0047] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0048] As an example, the negative electrode active material may adopt the negative electrode active material for the battery known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon pole flakes, tin pole flakes and lithium titanate, etc. The silicon pole flakes may be selected from at least one of elemental silicon, silicon oxide compounds, silicon carbon composites, silicon nitrogen composites and silicon alloys. The tin pole flakes may be selected from at least one of elemental tin, tin oxide compounds and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0049] In some embodiments, the separator is a membrane. The present application has no particular limitation on the type of the membrane, and any known porous membrane with good chemical stability and mechanical stability can be selected.

[0050] From the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0051] At present, in the gap coating process of the pole piece, the pole piece is spaced apart with a coating area and a blank area, the coating area of ​​the pole piece is coated with slurry, and the blank area of ​​the pole piece is not coated with slurry. Ordinary gap coating machines generally control and adjust the gap of the blank area of ​​the pole piece through a gap valve. Since the gap valve controls the slurry supply and interruption of the coating head, the slurry is prone to form an arc-shaped bulge at the head of the coating area of ​​the pole piece and a tail at the tail of the coating area. The thickness of the bulge and tail at the head of the coating area on the pole piece is inconsistent with the slurry thickness of the coating area of ​​the coating area itself. For the production requirements of pole pieces with higher production requirements, especially in the production of stacked battery cells, the traditional gap coating machine will affect the coating quality of the pole piece.

[0052] In view of this, in order to solve the problem of coating bulge and tail dragging of the pole piece during gap coating, some embodiments of the present application provide a coating device, which comprises a unwinding unit, a bonding unit and a coating unit in sequence, and the unwinding unit comprises a first unwinding unit and a second unwinding unit, the first unwinding unit is used to provide the pole piece, and the pole piece has a coating surface; the second unwinding unit is used to provide an isolation tape, and the bonding unit is used to bond the isolation tape to the pole piece to cover the coating surface of the pole piece; along the running direction of the isolation tape, the coating unit is arranged downstream of the bonding unit, and the coating unit is used to coat the slurry toward the isolation tape on the pole piece; wherein, the isolation tape is provided with hollow holes, the isolation tape is used to block the slurry from being coated on the coating surface of the pole piece, and the hollow holes are used for the slurry coated by the coating unit to be coated on the pole piece to form a coating area.

[0053] In such a coating device, the second unwinding unit provides an isolation tape with hollow holes. Before coating the electrode, the coating unit bonds the isolation tape to the coating surface of the electrode through the bonding unit. The coating unit coats the isolation tape on the electrode. The slurry coated by the coating unit at least covers the hollow holes of the isolation tape. The position of the hollow holes can be set corresponding to the position of the coating area on the electrode. The isolation tape itself can block the slurry from being applied to the coating surface of the electrode, and the hollow holes can allow the slurry coated by the coating unit to be applied to the electrode. After separating the isolation belt from the pole piece, the area on the pole piece corresponding to the hollow holes on the isolation belt is the coating area of ​​the pole piece, that is, the shape of the hollow holes is the shape of the coating area. The hollow holes on the isolation belt can play a shaping role on the shape of the coating area of ​​the pole piece, so that the shape of the coating area on the pole piece and the slurry thickness are consistent, and the coating area on the pole piece is not prone to head bulges and tail tailing problems, which solves the problems of head bulges and tail tailing in the coating film area of ​​the existing conventional gap coating machine and improves the coating quality of the pole piece.

[0054] The present application embodiment provides a coating device, please refer to Figures 1 to 7 The coating device 100 includes a reeling unit 10, a laminating unit 20 and a coating unit 30 in sequence. The reeling unit 10 includes a first reeling unit 11 and a second reeling unit 12. The first reeling unit 11 is used to provide a pole piece 60, and the pole piece 60 has a coating surface; the second reeling unit 12 is used to provide an isolation tape 70, and the laminating unit 20 is used to laminate the isolation tape 70 onto the pole piece 60; along the tape running direction of the isolation tape 70, the coating unit 30 is arranged downstream of the laminating unit 20, and the coating unit 30 is used to apply slurry toward the isolation tape 70 on the pole piece 60; wherein, a hollow hole 71 is provided on the isolation tape 70, and the isolation tape 70 is used to block the slurry from being coated on the coating surface of the pole piece 60, and the hollow hole 71 is used for the slurry coated by the coating unit 30 to be coated on the pole piece 60 to form a coating area 61. The pole piece 60 may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material pole piece 60 and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material pole piece 60 (such as a pole piece of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0055] The electrode sheet 60 is coated with active materials by the coating unit 30. For example, after coating at least one surface of the electrode sheet 60 with positive active materials, a positive electrode sheet can be obtained. For example, after coating at least one surface of the electrode sheet 60 with negative active materials, a negative electrode sheet can be obtained.

[0056] The material of the isolation tape 70 can be various, and the isolation tape 70 can be molded and rolled, and the isolation tape 70 is non-sticky. The laminating unit 20 can press the isolation tape 70 and the pole piece 60 together, and after being coated by the coating unit 30, the isolation tape 70 can be separated and rolled up separately. Of course, the isolation tape 70 can also be a sticky tape 72, and the laminating unit 20 can stick the tape 72 and the pole piece 60 together. After the coating unit 30 coats the pole piece 60 and the isolation tape 70, the isolation tape 70 is separated from the pole piece 60 after drying.

[0057] The thickness of the isolation belt 70 is consistent, and the thickness of the isolation belt 70 can be 10um-50um. The thickness of the isolation belt 70 itself is less than the slurry thickness of the coating area 61 on the pole piece 60. In this way, when the coating unit 30 coats the isolation belt 70 on the pole piece 60, the slurry effectively fills the area of ​​the hollow hole 71, and at least part of the slurry remains on the surface of the isolation belt 70, and the coating head 31 of the coating unit 30 will not scratch the isolation belt 70.

[0058] The width of the isolation tape 70 can be the same as the width of the pole piece 60, or can be slightly smaller than the width of the pole piece 60. However, after the isolation tape 70 is attached to the pole piece 60, the isolation tape 70 must at least cover the area on the pole piece 60 that needs to be coated. The width of the isolation tape 70 is adapted to the width of the pole piece 60, so that the isolation tape 70 can continuously cover at least the area of ​​the coating surface of the pole piece 60 that needs to be coated.

[0059] The hollow hole 71 refers to a hole structure provided on the isolation belt 70 and penetrating the isolation belt 70 in the thickness direction. In this way, when the coating unit 30 coats the isolation belt 70 on the pole piece 60, the slurry can be coated on the coating surface of the pole piece 60 through the hollow hole 71 of the isolation belt 70, and the slurry fills the area of ​​the hollow hole 71 of the isolation belt 70. The shape of the coating area 61 on the pole piece 60 is the same as the shape of the hollow hole 71, that is, the isolation belt 70 can make the shape of the coating area 61 of the pole piece 60 consistent with the thickness of the slurry. The shape of the hollow hole 71 can be designed according to the requirements of the coating area 61 of the pole piece 60. The shape of the hollow hole 71 can be various, and the shape of the hollow hole 71 can be rectangular, triangular or circular, etc. In the present embodiment, the shape of the hollow hole 71 is square.

[0060] The first unwinding unit 11 refers to an unwinding device capable of providing the pole piece 60 . The first unwinding unit 11 includes a first unwinding roller 111 , on which the pole piece 60 is wound. The first unwinding roller 111 rotates to continuously provide the pole piece 60 to the bonding unit 20 and the coating unit 30 .

[0061] The second unwinding unit 12 refers to an unwinding device capable of providing the isolation tape 70. The second unwinding unit 12 includes a second unwinding roller 121, on which the isolation tape 70 is wound. The second unwinding roller 121 rotates to continuously provide the isolation tape 70 to the laminating unit 20 and the coating unit 30. The unwinding speed of the second unwinding unit 12 is adapted to the unwinding speed of the first unwinding unit 11, so that the isolation tape 70 can be continuously disposed against the coating surface of the pole piece 60 under the action of the laminating unit 20.

[0062] The laminating unit 20 is capable of laminating the isolation tape 70 provided by the second unwinding unit 12 to the coating surface of the pole piece 60 provided by the first unwinding unit 11 before the coating unit 30 coats the pole piece 60, that is, pressing the isolation tape 70 against the pole piece 60. The laminating unit 20 can laminarly attach the isolation tape 70 and the pole piece 60 together, or can paste and fix the isolation tape 70 and the pole piece 60 together. The specific structure of the laminating unit 20 can be determined according to actual conditions, and it is only necessary to ensure that when the coating unit 30 coats the pole piece 60, the isolation tape 70 is in contact with and covers the coating surface of the pole piece 60.

[0063] A plurality of first rollers 80 are provided between the first unwinding unit 11 and the laminating unit 20, and the first rollers 80 are used to guide the pole piece 60 to pass through the laminating unit 20. A plurality of second rollers 81 are provided between the laminating unit 20 and the coating unit 30, and the second rollers 81 can guide the pole piece 60 and the isolation belt 70 to pass through the coating unit 30.

[0064] The coating unit 30 refers to a coating device capable of coating the pole piece 60 . The coating unit 30 includes a coating head 31 and a back roller 32 . The back roller 32 allows the pole piece 60 and the isolation belt 70 to pass through. The coating head 31 can coat the slurry toward the pole piece 60 and the isolation belt 70 on the pole piece 60 .

[0065] When the pole piece 60 is coated, if the viscosity of the slurry is too low or the solid content is too low, the slurry will be separated into solid and liquid. Because the fluidity of the liquid is better than that of the solid, when the solid stops flowing, the liquid part or the part with low solid content will still flow outward, forming a tail trailing phenomenon of the pole piece 60.

[0066] In the technical solution of the embodiment of the present application, an isolation tape 70 is provided by a second unwinding unit 12, and a hollow hole 71 is arranged on the isolation tape 70. Before coating the electrode 60, the coating unit 30 bonds the isolation tape 70 to the coating surface of the electrode 60 through the bonding unit 20. The coating unit 30 coats the isolation tape 70 on the electrode 60. The slurry coated by the coating unit 30 at least covers the hollow holes 71 of the isolation tape 70. The position of the hollow holes 71 corresponds to the position of the coating area 61 on the electrode 60. The isolation tape 70 itself can block the slurry from being coated on the coating surface of the electrode 60, and the hollow holes 71 can allow the slurry coated by the coating unit 30 to be coated on the electrode 60. After separating the isolation belt 70 from the pole piece 60, the area on the pole piece 60 corresponding to the hollow hole 71 on the isolation belt 70 is the coating area 61 of the pole piece 60, that is, the shape of the hollow hole 71 is the shape of the coating area 61, and the boundary of the hollow hole 71 on the isolation belt 70 can limit the shape of the coating area 61 on the pole piece 60. The hollow hole 71 on the isolation belt 70 can play a shaping role on the shape of the coating area 61 of the pole piece 60, so that the shape of the coating area 61 on the pole piece 60 and the slurry thickness are consistent, and the coating area 61 on the pole piece 60 is not prone to the problem of head bulge and tail tailing, which solves the problem of head bulge and tail tailing of the coating film area of ​​the existing conventional gap coating machine, and improves the coating quality of the pole piece 60.

[0067] Furthermore, the present solution does not require structural improvement of the original coating equipment, and only requires adding a second unwinding unit 12 and a laminating unit 20 to the original coating equipment. The improvement is easy to implement and has little difficulty.

[0068] According to some embodiments of the present application, there are multiple hollow holes 71 , and the multiple hollow holes 71 are distributed at intervals along the length direction Y and / or the width direction X of the isolation belt 70 .

[0069] The plurality of hollow holes 71 are spaced apart along the length direction Y and / or the width direction X of the isolation belt 70, and there are various situations. Figure 4 and Fig.12 As shown, the plurality of hollow holes 71 may be distributed at intervals along the length direction Y of the isolation belt 70, or may be distributed at intervals along the width direction X of the isolation belt 70. Figure 8 As shown, the plurality of hollow holes 71 are distributed along the length direction Y of the isolation belt 70 and are also distributed at intervals along the width direction X of the isolation belt 70. The length direction Y of the isolation belt 70 is also the conveying direction of the isolation belt 70. Taking a laminated battery cell as an example, Figure 4 As shown, the hollow holes 71 of the isolation belt 70 are in a square shape, and a plurality of hollow holes 71 are distributed at intervals along the length direction Y of the isolation belt 70 .

[0070] Taking the square shape of the hollow hole 71 of the isolation belt 70 as an example, after the coating unit 30 coats the isolation belt 70 on the pole piece 60 and separates the isolation belt 70 from the pole piece 60, the coating area 61 on the pole piece 60 is in the shape of a square tofu block. In the case where multiple hollow holes 71 are distributed along the length direction Y of the isolation belt 70, multiple coating areas 61 on the pole piece 60 are distributed at intervals along the length direction Y of the pole piece 60. Of course, according to the coating requirements, hollow holes 71 of any shape or size can be processed on the isolation belt 70 to meet the requirements of the coating area 61 of the pole piece 60.

[0071] The number of hollow holes 71 is set to be multiple, and the multiple hollow holes 71 are spaced apart along the length direction Y and / or the width direction X of the isolation belt 70. After the coating unit 30 applies slurry to the pole piece 60 and the isolation belt 70, after the isolation belt 70 is separated from the pole piece 60, multiple coating areas 61 that match the shape of the hollow holes 71 can be formed on the pole piece 60, thereby realizing the assembly line coating operation. In addition, the spacing between two adjacent hollow holes 71 on the isolation belt 70 can be set according to the situation, so that the spacing of the coating areas 61 coated on the pole piece 60 by the coating unit 30 can be set arbitrarily, thereby solving the problem that the film area spacing of the pole piece 60 in the prior art cannot be too small.

[0072] According to some embodiments of the present application, the shapes of the plurality of hollow holes 71 are the same; or, the shapes of the plurality of hollow holes 71 are partially the same.

[0073] The same shape of the multiple hollow holes 71 means that the multiple hollow holes 71 on the isolation belt 70 have the same shape. Then, after coating by the coating unit 30, multiple coating film areas 61 with the same shape and arranged at intervals will be formed on the pole piece 60. The shapes of the multiple hollow holes 71 are not completely the same, which means that some of the hollow holes 71 on the isolation belt 70 have the same shape, and another part of the hollow holes 71 have different shapes. In this embodiment, the multiple hollow holes 71 have the same shape, which are all square.

[0074] The shapes of the plurality of hollow holes 71 may be the same or different. The shape of the hollow holes 71 on the isolation belt 70 may be determined according to actual conditions and may be set according to the coating requirements of the coating area 61 on the pole piece 60 .

[0075] According to some embodiments of the present application, the coating device 100 also includes an oven 40 and a first winding unit 50. Along the conveying direction of the pole piece 60, the oven 40 is arranged on the downstream side of the coating unit 30, and the oven 40 is used to dry the slurry on the pole piece 60 and / or the isolation tape 70 after coating; the first winding unit 50 is arranged on the downstream side of the oven 40, and the first winding unit 50 is used to wind up the pole piece 60.

[0076] The oven 40 is a drying device that can dry the electrode piece 60 obtained after coating, and dry the slurry in the coating film area 61 on the electrode piece 60. The first winding unit 50 is a winding device that winds up the electrode piece 60 after drying.

[0077] A traction roller 83 and a plurality of third rollers 82 may be provided between the oven 40 and the first winding unit 50 . The traction roller 83 has a traction effect on the pole piece 60 , and the third rollers 82 have a guiding and directing effect on the pole piece 60 .

[0078] The oven 40 is arranged on the downstream side of the coating unit 30. The oven 40 can dry the slurry on the coated electrode piece 60 and / or the isolation tape 70. The first winding unit 50 is arranged on the downstream side of the oven 40. The first winding unit 50 can wind up the dried electrode piece 60 to complete the winding process of the electrode piece 60.

[0079] According to some embodiments of the present application, the isolation tape 70 is an adhesive tape 72, which includes an adhesive paper 721 and a release paper 722 along its thickness direction, the adhesive paper 721 has an adhesive layer, and the release paper 722 is attached to the adhesive layer of the adhesive paper 721; a second winding unit 51 is arranged between the second unwinding unit 12 and the laminating unit 20, and the second winding unit 51 is used to separate the release paper 722 on the isolation tape 70 from the adhesive paper 721 and to wind up the release paper 722.

[0080] The isolation tape 70 is an adhesive tape 72. The adhesive tape 72 refers to the isolation tape 70 with an adhesive layer. The adhesive tape 72 includes adhesive paper 721 and release paper 722. The side of the adhesive paper 721 facing the release paper 722 has an adhesive layer. Release paper 722 is also called silicone oil paper or anti-stick paper. It mainly plays the role of a sticky object of the isolation tape 70, such as adhesive tape 72. The release paper 722 is arranged on one side of the adhesive layer on the adhesive paper 721, and can isolate the adhesive layer of the adhesive paper 721. After separating the release paper 722 from the adhesive paper 721, the adhesive layer on the adhesive paper 721 is exposed to the outside, and the adhesive paper 721 can be adhered and fixed to the coated surface of the electrode 60 through the adhesive layer.

[0081] The second winding unit 51 refers to a winding device capable of separating the release paper 722 . The second winding unit 51 includes a second winding shaft. The second winding shaft can provide traction to separate the release paper 722 from the adhesive paper 721 and then rewind the release paper 722 for recycling.

[0082] Of course, the coating device can also include a glue peeling component 57, which can include a glue peeling cylinder and a glue peeling roller. The glue peeling cylinder can drive the glue peeling roller to move, open the gap between the adhesive paper 721 and the electrode 60, and facilitate the separation of the adhesive paper 721 and the electrode 60.

[0083] Since the slurry has a certain fluidity after the coating unit 30 coats the isolation tape 70 on the pole piece 60, the rapid separation of the isolation tape 70 from the pole piece 60 may affect the molding quality of the coating area 61 due to the flow of the slurry. The isolation tape 70 is an adhesive tape 72, and a second winding unit 51 is provided between the second unwinding unit 12 and the laminating unit 20. After the second winding unit 51 separates the release paper 722 from the adhesive paper 721 on the isolation tape 70, the adhesive paper 721 is fixed to the pole piece 60 through the laminating unit 20. The bonding stability of the adhesive paper 721 and the pole piece 60 is higher, and the adhesive paper 721 is not easy to fall off the pole piece 60. The coating unit 30 coats the pole piece 60 and the adhesive paper 721 stably.

[0084] According to some embodiments of the present application, the laminating unit 20 includes a laminating cylinder 21 and a laminating roller 22. The laminating cylinder 21 is used to drive the laminating roller 22 to move closer to or away from the pole piece 60. The laminating roller 22 is used to laminarly attach the adhesive paper 721 separated from the release paper 722 to the pole piece 60.

[0085] The glue cylinder 21 refers to a driving device that can drive the glue pressing roller 22 to move, and the glue cylinder 21 can be a conventional cylinder device. The glue cylinder 21 is installed on the frame, and the glue roller is rotatably installed on the glue rack. The driving end of the glue cylinder 21 is connected to the glue rack. The glue cylinder 21 can drive the glue rack to drive the glue roller to approach or move away from the pole piece 60 to adjust the tightness between the glue roller and the pole piece 60. The glue roller sticks the adhesive paper 721 on the coating surface of the pole piece 60.

[0086] The glue pressing roller 22 can stick the adhesive paper 721 separated from the release paper 722 on the coating surface of the electrode 60. Under the action of the glue sticking cylinder 21, the glue pressing roller 22 can be driven close to or away from the electrode 60, so that the distance between the glue pressing roller 22 and the roller for conveying the electrode 60 can be adjusted, and then the tightness of the fit between the adhesive paper 721 and the electrode 60 can be adjusted, so that the adhesive paper 721 can be stuck on the electrode 60 with a preset pressure, which can not only ensure the sticking stability of the adhesive paper 721 on the electrode 60, but also facilitate the subsequent separation of the adhesive paper 721 from the electrode 60.

[0087] According to some embodiments of the present application, the coating device 100 also includes a third winding unit 52, which is arranged between the oven 40 and the first winding unit 50, and the third winding unit 52 is used to separate the adhesive paper 721 from the electrode 60 and to wind up the adhesive paper 721.

[0088] The third winding unit 52 refers to a winding device capable of winding the adhesive tape 721 . Along the conveying direction of the electrode sheet 60 , the third winding unit 52 is disposed on the downstream side of the oven 40 .

[0089] By arranging the third winding unit 52 between the oven 40 and the first winding unit 50, after the pole piece 60 and the adhesive tape 721 are dried in the oven 40, the slurry in the coating area 61 on the pole piece 60 has been solidified, and the third winding unit 52 separates the adhesive tape 721 dried in the oven 40 from the pole piece 60, which will not affect the integrity of the slurry on the coating area 61 of the pole piece 60, and the molding quality of the coating area 61 on the pole piece 60 is better. The third winding unit 52 can provide traction to the adhesive tape 721, separate the adhesive tape 721 from the pole piece 60, and rewind the adhesive tape 721.

[0090] According to some embodiments of the present application, the isolation tape 70 has no adhesive layer, and the laminating unit 20 is arranged adjacent to the coating unit 30; the coating device 100 also includes a fourth winding unit 53, which is arranged between the coating unit 30 and the oven 40, and the fourth winding unit 53 is used to wind up the isolation tape 70 on the electrode 60 after coating.

[0091] The fourth winding unit 53 is disposed between the coating unit 30 and the oven 40, which means that the fourth winding unit 53 can wind up the isolation tape 70 on the coated pole piece 60. A dust collecting box 56 can also be disposed between the fourth winding unit 53 and the coating unit 30, and the dust collecting box 56 can receive the slurry on the isolation tape 70 to prevent the slurry from falling onto the coating area 61 on the pole piece 60.

[0092] Since the isolation tape 70 is non-sticky, the isolation tape 70 cannot be transported for a long distance together with the pole piece 60. The laminating unit 20 places the isolation tape 70 against the pole piece 60. By arranging the laminating unit 20 and the coating unit 30 adjacent to each other, the coating unit 30 can immediately coat the isolation tape 70 on the pole piece 60. The fourth winding unit 53 is arranged between the coating unit 30 and the oven 40. The fourth winding unit 53 can directly wind up the coated isolation tape 70 to complete the rapid separation of the isolation tape 70 and the pole piece 60. The pole piece 60 separated from the isolation tape 70 enters the oven 40 for a drying process.

[0093] According to some embodiments of the present application, the laminating unit 20 includes two relatively distributed clamping rollers 23 , and the two clamping rollers 23 are used to press the isolation tape 70 against the coated surface of the pole piece 60 .

[0094] The two rollers 23 are arranged opposite to each other on the frame, and the gap between the two rollers 23 allows the pole piece 60 and the isolation tape 70 to pass through. The isolation tape 70 can be placed against the pole piece 60 by the clamping force of the two rollers 23, so that the coating unit 30 can coat the isolation tape 70 on the pole piece 60.

[0095] By setting up two clamping rollers 23, the two clamping rollers 23 can abut the isolation tape 70 against the coating surface of the pole piece 60, and can briefly press the isolation tape 70 onto the pole piece 60, and then the coating unit 30 coats the isolation tape 70 on the pole piece 60 to complete the coating of the coating area 61 of the pole piece 60.

[0096] According to some embodiments of the present application, the coating device 100 also includes a first correcting mechanism 54 and a second correcting mechanism 55, the first correcting mechanism 54 is arranged between the first unwinding unit 11 and the laminating unit 20; the second correcting mechanism 55 is arranged between the second unwinding unit 12 and the laminating unit 20.

[0097] The first deflection correction mechanism 54 is a deflection correction structure capable of correcting the conveyance of the electrode sheet 60, and the second deflection correction mechanism 55 has the same structure as the first deflection correction mechanism 54. The deflection correction mechanism is a deflection correction structure provided in the existing coating equipment or coating production line, and the deflection correction mechanism can generally be corrected by a deflection correction roller, and the first deflection correction mechanism 54 and the second deflection correction mechanism 55 will not be described in detail here.

[0098] Of course, the coating device 100 can also include a CCD monitoring module, which can monitor the alignment accuracy of the pole piece 60 and the isolation belt 70. When the CCD monitoring module detects that the isolation belt 70 is misaligned with the pole piece 60, the CCD monitoring module can link the coating device to control the corresponding pole piece 60 / isolation belt 70 to loosen the clamping roller 23, adjust the running speed, and clamp the clamping roller 23 again after alignment to make the running speed of the pole piece 60 and the isolation belt 70 consistent in preparation for coating.

[0099] By setting the first deflection correcting mechanism 54 and the second deflection correcting mechanism 55, the first deflection correcting mechanism 54 can center the pole piece 60 while the second deflection correcting mechanism 55 can center the isolation belt 70. The first deflection correcting mechanism 54 and the second deflection correcting mechanism 55 cooperate with each other to align the isolation belt 70 and the pole piece 60 so that when the subsequent bonding unit 20 bonds the isolation belt 70 and the pole piece 60, the alignment accuracy of the isolation belt 70 and the pole piece 60 is high, and the isolation belt 70 and the pole piece 60 are not easily offset or misaligned.

[0100] An embodiment of the present application further provides a battery manufacturing device, which includes the coating device 100 of any of the aforementioned embodiments.

[0101] An embodiment of the present application also provides a coating method, which is based on the coating device 100 of any of the aforementioned embodiments. The coating method includes: attaching an isolation tape 70 to the coating surface of the pole piece 60, coating slurry on the isolation tape 70 of the pole piece 60, and separating the isolation tape 70 from the pole piece 60.

[0102] A hollow hole 71 is provided on the isolation tape 70. Before coating the electrode 60, the coating unit 30 bonds the isolation tape 70 to the coating surface of the electrode 60 through the bonding unit 20. The coating unit 30 coats the isolation tape 70 on the electrode 60. The slurry coated by the coating unit 30 at least covers the hollow holes 71 of the isolation tape 70. The position of the hollow holes 71 corresponds to the position of the coating area 61 on the electrode 60. The isolation tape 70 itself can block the slurry from being coated on the coating surface of the electrode 60, and the hollow holes 71 can allow the slurry coated by the coating unit 30 to be coated on the electrode 60. After separating the isolation tape 70 from the pole piece 60, the area on the pole piece 60 corresponding to the hollow hole 71 on the isolation tape 70 is the coating area 61 of the pole piece 60, that is, the shape of the hollow hole 71 is the shape of the coating area 61, and the boundary of the hollow hole 71 on the isolation tape 70 can limit the shape of the coating area 61 on the pole piece 60. The hollow hole 71 on the isolation tape 70 can play a shaping role on the shape of the coating area 61 of the pole piece 60, so that the shape of the coating area 61 on the pole piece 60 is consistent with the slurry thickness, and the coating area 61 on the pole piece 60 is not prone to problems such as head bulge and tail dragging, thereby improving the coating quality of the pole piece 60.

[0103] According to some embodiments of the present application, before the isolation tape 70 is separated from the pole piece 60 , the coated pole piece 60 and the isolation tape 70 are dried together in an oven 40 , and then the isolation tape 70 is separated from the pole piece 60 .

[0104] After the pole piece 60 and the adhesive paper 721 are dried in the oven 40 together, the adhesive paper 721 is separated from the pole piece 60. At this time, the slurry on the coating area 61 of the pole piece 60 has been solidified. In this way, the separation of the adhesive paper 721 from the pole piece 60 will not affect the integrity of the slurry on the coating area 61 of the pole piece 60, and the molding quality of the coating area 61 of the pole piece 60 is better.

[0105] Please combine Figures 3 to 11 The overall working process of the coating device is described in detail below, taking the isolation belt 70 as the adhesive belt 72 as an example: The first unwinding unit 11 and the second unwinding unit 12 unwind the materials at the same time, and the pole piece 60 and the isolation belt 70 are guided and transported by rollers and traction rollers. The first deviation correction mechanism 54 and the second deviation correction mechanism 55 monitor the running of the pole piece 60 and the isolation belt 70. The second winding unit 51 separates the release paper 722 on the adhesive tape 72. Under the action of the laminating unit 20, the laminating unit 20 attaches the adhesive paper 721 separated from the release paper 722 to the coating surface of the pole piece 60. Then the coating unit 30 continuously coats the pole piece 60 and the adhesive paper 721 on the pole piece 60, and then the adhesive paper 721 enters the oven 40 with the pole piece 60 for drying. The third winding unit 52 separates and rewinds the adhesive paper 721 from the pole piece 60, and multiple coating areas 61 distributed at intervals are formed on the coating surface of the pole piece 60 after the adhesive paper 721 is separated. The first winding unit 50 rewinds the pole piece 60 separated from the adhesive paper 721.

[0106] In some embodiments, the coating device 100 includes a unwinding unit 10, a bonding unit 20 and a coating unit 30 in sequence. The unwinding unit 10 includes a first unwinding unit 11 and a second unwinding unit 12. The first unwinding unit 11 is used to provide a pole piece 60, and the pole piece 60 has a coating surface; the second unwinding unit 12 is used to provide an isolation tape 70, and the bonding unit 20 is used to bond the isolation tape 70 to the pole piece 60 to cover the coating surface of the pole piece 60; along the running direction of the isolation tape 70, the coating unit 30 is arranged downstream of the bonding unit 20, and the coating unit 30 is used to coat the slurry toward the isolation tape 70 on the pole piece 60; wherein, a hollow hole 71 is provided on the isolation tape 70, and the isolation tape 70 is used to block the slurry from being coated on the pole piece 60, and the hollow hole 71 is used for the slurry coated by the coating unit 30 to be coated on the pole piece 60 to form a coating area 61. There are multiple hollow holes 71, and the multiple hollow holes 71 are spaced apart along the length direction Y and / or the width direction X of the isolation belt 70. The multiple hollow holes 71 have the same shape; or the multiple hollow holes 71 have partially the same shape.

[0107] A hollow hole 71 is provided on the isolation tape 70. Before coating the electrode 60, the coating unit 30 bonds the isolation tape 70 to the coating surface of the electrode 60 through the bonding unit 20. The coating unit 30 coats the isolation tape 70 on the electrode 60. The slurry coated by the coating unit 30 at least covers the hollow holes 71 of the isolation tape 70. The position of the hollow holes 71 corresponds to the position of the coating area 61 on the electrode 60. The isolation tape 70 itself can block the slurry from being coated on the coating surface of the electrode 60, and the hollow holes 71 can allow the slurry coated by the coating unit 30 to be coated on the electrode 60. After separating the isolation belt 70 from the pole piece 60, the area on the pole piece 60 corresponding to the hollow hole 71 on the isolation belt 70 is the coating area 61 of the pole piece 60, that is, the shape of the hollow hole 71 is the shape of the coating area 61, and the boundary of the hollow hole 71 on the isolation belt 70 can limit the shape of the coating area 61 on the pole piece 60. The hollow hole 71 on the isolation belt 70 can play a shaping role on the shape of the coating area 61 of the pole piece 60, so that the shape of the coating area 61 on the pole piece 60 and the slurry thickness are consistent, and the coating area 61 on the pole piece 60 is not prone to the problem of head bulge and tail tailing, which solves the problem of head bulge and tail tailing of the coating film area of ​​the existing conventional gap coating machine, and improves the coating quality of the pole piece 60. The number of the hollow holes 71 is set to be multiple, and the multiple hollow holes 71 are spaced apart along the length direction Y and / or the width direction X of the isolation belt 70. After the coating unit 30 applies the slurry to the pole piece 60 and the isolation belt 70, and the isolation belt 70 is separated from the pole piece 60, multiple coating areas 61 that match the shape of the hollow holes 71 can be formed on the pole piece 60. The shapes of the multiple hollow holes 71 can be the same or not completely the same. The shape of the hollow holes 71 on the isolation belt 70 can be determined according to the actual situation, and can be set according to the coating requirements of the coating area 61 on the pole piece 60.

[0108] In some embodiments, the coating device 100 further includes an oven 40 and a first winding unit 50. The oven 40 is disposed on the downstream side of the coating unit 30 along the conveying direction of the electrode piece 60. The oven 40 is used to dry the electrode piece 60 and / or the slurry on the isolation tape 70 after coating. The first winding unit 50 is disposed on the downstream side of the oven 40. The first winding unit 50 is used to wind up the electrode piece 60. The isolation tape 70 is an adhesive tape 72. The adhesive tape 72 includes an adhesive paper 721 and a release paper 722 along its thickness direction. The adhesive paper 721 has an adhesive layer. The release paper 722 is attached to the adhesive layer of the adhesive paper 721. A second winding unit 51 is disposed between the second unwinding unit 12 and the laminating unit 20. The second winding unit 51 is used to separate the release paper 722 on the isolation tape 70 from the adhesive paper 721. The laminating unit 20 includes a laminating cylinder 21 and a laminating roller 22. The laminating cylinder 21 is used to drive the laminating roller 22 to approach or move away from the electrode 60. The laminating roller 22 is used to laminating the adhesive paper 721 separated from the release paper 722 on the electrode 60. The coating device also includes a third winding unit 52, which is arranged between the oven 40 and the first winding unit 50, and is used to separate the adhesive paper 721 from the electrode 60.

[0109] The oven 40 is arranged at the downstream side of the coating unit 30. The oven 40 can dry the slurry on the electrode piece 60 and / or the isolation tape 70 after coating. The first winding unit 50 is arranged at the downstream side of the oven 40. The first winding unit 50 can wind up the electrode piece 60 after drying to complete the winding process of the electrode piece 60. The isolation tape 70 is an adhesive tape 72. A second winding unit 51 is arranged between the second unwinding unit 12 and the laminating unit 20. The second winding unit 51 separates the release paper 722 on the isolation tape 70 from the adhesive paper 721, and then fixes the adhesive paper 721 on the electrode piece 60 through the laminating unit 20. The adhesive paper 721 has a higher bonding stability with the electrode piece 60, and the adhesive paper 721 is not easy to fall off from the electrode piece 60. The coating unit 30 stably coats the electrode piece 60 and the adhesive paper 721. The glue pressing roller 22 can stick the adhesive paper 721 separated from the release paper 722 on the coating surface of the electrode 60. Under the action of the glue sticking cylinder 21, the glue pressing roller 22 can be driven close to or away from the electrode 60, so that the distance between the glue pressing roller 22 and the roller for conveying the electrode 60 can be adjusted, and then the tightness of the fit between the adhesive paper 721 and the electrode 60 can be adjusted, so that the adhesive paper 721 can be stuck on the electrode 60 with a preset pressure, which can not only ensure the sticking stability of the adhesive paper 721 on the electrode 60, but also facilitate the subsequent separation of the adhesive paper 721 from the electrode 60. By arranging the third winding unit 52 between the oven 40 and the first winding unit 50, after the pole piece 60 and the adhesive tape 721 are dried in the oven 40, the slurry in the coating area 61 on the pole piece 60 has been solidified, and the third winding unit 52 separates the adhesive tape 721 dried in the oven 40 from the pole piece 60, which will not affect the integrity of the slurry on the coating area 61 of the pole piece 60, and the molding quality of the coating area 61 on the pole piece 60 is better. The third winding unit 52 can provide traction to the adhesive tape 721, separate the adhesive tape 721 from the pole piece 60, and rewind the adhesive tape 721.

[0110] In some embodiments, the isolation tape 70 has no adhesive layer, and the laminating unit 20 is disposed adjacent to the coating unit 30; the coating device further comprises a fourth winding unit 53, which is disposed between the coating unit 30 and the oven 40, and is used to wind up the isolation tape 70 on the coated pole piece 60. The laminating unit 20 comprises two relatively distributed clamping rollers 23, and the two clamping rollers 23 are used to place the isolation tape 70 against the coated surface of the pole piece 60.

[0111] Since the isolation tape 70 is not sticky, the isolation tape 70 cannot be transported for a long distance together with the pole piece 60. The laminating unit 20 places the isolation tape 70 against the pole piece 60. By placing the laminating unit 20 adjacent to the coating unit 30, the coating unit 30 can immediately coat the isolation tape 70 on the pole piece 60. The fourth winding unit 53 is arranged between the coating unit 30 and the oven 40. The fourth winding unit 53 can directly roll up the coated isolation tape 70 to complete the rapid separation of the isolation tape 70 from the pole piece 60. The pole piece 60 separated from the isolation tape 70 then enters the oven 40 for a drying process. The two clamping rollers 23 can place the isolation tape 70 against the coating surface of the pole piece 60 and can briefly press the isolation tape 70 onto the pole piece 60. Then the coating unit 30 coats the isolation tape 70 on the pole piece 60 to complete the coating of the coating area 61 of the pole piece 60.

[0112] In some embodiments, the coating device 100 further includes a first deflection correction mechanism 54 and a second deflection correction mechanism 55. The first deflection correction mechanism 54 is disposed between the first unwinding unit 11 and the laminating unit 20; the second deflection correction mechanism 55 is disposed between the second unwinding unit 12 and the laminating unit 20. Through the arrangement of the first deflection correction mechanism 54 and the second deflection correction mechanism 55, the first deflection correction mechanism 54 can center the pole piece 60 for conveying, and the second deflection correction mechanism 55 can center the isolation belt 70 for conveying. The first deflection correction mechanism 54 and the second deflection correction mechanism 55 cooperate to align the isolation belt 70 and the pole piece 60 for conveying, so that when the subsequent laminating unit 20 laminates the isolation belt 70 and the pole piece 60, the isolation belt 70 and the pole piece 60 have high alignment accuracy, and the isolation belt 70 and the pole piece 60 are not easily offset and misaligned.

[0113] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A coating device, characterized in that: The device comprises an unwinding unit, a laminating unit and a coating unit in sequence, wherein the unwinding unit comprises a first unwinding unit and a second unwinding unit, wherein the first unwinding unit is used to provide a pole piece, wherein the pole piece has a coating surface; the second unwinding unit is used to provide an isolation tape, and the laminating unit is used to laminarize the isolation tape on the pole piece; along the running direction of the isolation tape, the coating unit is arranged downstream of the laminating unit, and the coating unit is used to coat the slurry toward the isolation tape on the pole piece; The isolation belt is provided with hollow holes, the isolation belt is used to block the slurry from being coated on the coating surface of the pole piece, and the hollow holes are used for the slurry coated by the coating unit to be coated on the pole piece to form a coating area.

2. The coating device according to claim 1, characterized in that: There are multiple hollow holes, and the multiple hollow holes are distributed at intervals along the length direction and / or width direction of the isolation belt.

3. The coating device according to claim 2, characterized in that: The shapes of the plurality of hollow holes are the same; or, the shapes of the plurality of hollow holes are partially the same.

4. The coating device according to claim 1, characterized in that: The coating device also includes: An oven, arranged on the downstream side of the coating unit along the conveying direction of the electrode piece, and used for drying the slurry on the electrode piece and / or the isolation belt after coating; The first winding unit is arranged at the downstream side of the oven, and is used for winding the pole piece.

5. The coating device according to claim 4, characterized in that: The isolation tape is an adhesive tape, and the adhesive tape includes adhesive paper and release paper along its thickness direction, the adhesive tape has an adhesive layer, and the release paper is attached to the adhesive layer of the adhesive tape; A second winding unit is provided between the second unwinding unit and the laminating unit, and the second winding unit is used for separating the release paper from the adhesive paper on the isolation tape and winding the release paper.

6. The coating device according to claim 5, characterized in that: The laminating unit comprises a laminating cylinder and a laminating roller, wherein the laminating cylinder is used to drive the laminating roller to be close to or away from the pole piece, and the laminating roller is used to laminating the adhesive paper separated from the release paper onto the pole piece.

7. The coating device according to claim 5, characterized in that: The coating device also includes: The third winding unit is arranged between the oven and the first winding unit, and the third winding unit is used to separate the adhesive tape from the electrode and to wind up the adhesive tape.

8. The coating device according to claim 4, characterized in that: The isolation tape has no adhesive layer, and the laminating unit is arranged adjacent to the coating unit; The coating device also includes: The fourth winding unit is arranged between the coating unit and the oven, and is used for winding the isolation tape on the electrode after coating.

9. The coating device according to claim 8, characterized in that: The laminating unit comprises two clamping rollers which are arranged opposite to each other, and the two clamping rollers are used to press the isolation tape against the coating surface of the pole piece.

10. The coating device according to claim 1, characterized in that: The coating device also includes: A first deviation-correcting mechanism is disposed between the first unwinding unit and the laminating unit; The second deviation-correcting mechanism is arranged between the second unwinding unit and the laminating unit.

11. A battery manufacturing device, characterized in that: Comprising a coating device according to any one of claims 1-10.

12. A coating method, based on the coating device according to any one of claims 1 to 10, characterized in that: include: The isolation tape is attached to the coating surface of the pole piece, slurry is coated on the isolation tape of the pole piece, and the isolation tape is separated from the pole piece.

13. The coating method according to claim 12, characterized in that: Before the isolation tape is separated from the pole piece, the coated pole piece and the isolation tape are dried in an oven together, and then the isolation tape is separated from the pole piece.

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