Coating device and battery production system

Abstract

The embodiment of the utility model provides a coating device and a battery production system.The coating device comprises a coating roller and a slurry storage unit, the coating roller comprises a roller body and a plurality of protruding strips arranged on the peripheral side of the roller body, the protruding strips are sequentially arranged at intervals, and the arrangement direction of the protruding strips intersects with the extending direction of the protruding strips; each raised line comprises a coating end deviating from the roller body; the slurry storage unit is used for storing slurry and providing the slurry for the coating end; wherein the coating end is provided with a plurality of concave parts, the concave parts are used for carrying slurry and coating the slurry on a target object, and a groove is defined by every two adjacent convex strips and the roller body, so that the target object is coated with the slurry at intervals. The infiltration effect of the electrode assembly can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a coating device and a battery production system. Background Art

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the development of battery technology, how to improve the wetting effect of electrode components is a research direction in battery technology. Utility Model Content

[0004] The present application provides a coating device and a battery production system, which can improve the wetting effect of an electrode assembly.

[0005] An embodiment of the present application provides a coating device, which includes a coating roller and a slurry storage unit. The coating roller includes a roller body and a plurality of convex strips arranged on the outer peripheral side of the roller body. The plurality of convex strips are arranged in sequence at intervals, and the arrangement direction of the plurality of convex strips intersects with the extension direction of the convex strips. The convex strips include a coating end that faces away from the roller body; the slurry storage unit is used to store slurry and provide slurry to the coating end; wherein the coating end is provided with a plurality of recesses, and the plurality of recesses are used to carry the slurry and apply the slurry to a target object, and a groove is formed between two adjacent convex strips and the roller body so that the slurry is applied to the target object at intervals.

[0006] In the above technical solution, the coating device of the embodiment of the present application is provided with a coating roller having convex strips, and the coating end of the convex strips is used to coat the target object, and a groove not used for coating is formed between two adjacent convex strips, so that the slurry is coated on the target object at intervals, that is, the slurry coatings formed on the target object are arranged at intervals, so that a fast penetration channel of the electrolyte can be formed between two adjacent slurry coatings, thereby improving the wetting effect of the electrode assembly. In addition, a plurality of recesses are provided on the coating end, and the recesses increase the contact area with the slurry, so that the slurry can be better carried for coating.

[0007] In some embodiments, an extending direction of the convex strips intersects with a circumferential direction of the roller body.

[0008] In the above technical solution, a wetting channel having an angle with the tape running direction is formed in the tape running direction of the target object. This wetting channel facilitates the rapid infiltration of the electrolyte for the electrode assembly wound along the tape running direction.

[0009] In some embodiments, the plurality of convex strips extend along the axial direction of the roller body and are arranged along the circumferential direction of the roller body.

[0010] In the above technical solution, the wetting channels formed between the coatings extend in the height direction for the wound electrode assembly, so as to facilitate faster wetting.

[0011] In some embodiments, the convex strips are arranged in a circle along the circumferential direction of the roller body.

[0012] In the above technical solution, for the laminated electrode assembly, the formed infiltration channel extends in the horizontal direction or the vertical direction, so the path is short, which is convenient for rapid infiltration.

[0013] In some embodiments, the plurality of convex strips are arranged at equal intervals, and / or the plurality of convex strips have the same protruding height relative to the roller body.

[0014] In the above technical solution, the multiple convex strips are arranged at equal intervals, so the widths of the multiple wetting channels formed are the same, thereby reducing the difference in wetting effects in different areas of the electrode assembly and facilitating the control of the wetting effect.

[0015] In the above technical solution, the protruding heights of the plurality of convex strips relative to the roller body are set to be the same, so that the thickness of the slurry coating formed on the target object is substantially the same, thereby improving the consistency of the coating.

[0016] In some embodiments, the coating end includes a plurality of first convex ribs disposed in parallel and a plurality of second convex ribs disposed in parallel, and the plurality of first convex ribs and the plurality of second convex ribs intersect to form a plurality of recesses.

[0017] In the above technical solution, a grid structure is formed at the coating end, so that the number of recesses can be increased and the material loading capacity of the coating end can be improved.

[0018] In some embodiments, the slurry storage unit comprises a storage tank, the storage tank is located below the coating roller, and the coating end is used to contact the slurry in the storage tank.

[0019] In the above technical solution, the storage tank is arranged below the coating roller. In this way, even if the bottom wall and side wall of the groove are in contact with the slurry, during the rotation of the coating roller, the residual slurry in the groove will be thrown out under the action of gravity, and it is difficult to coat it onto the target object, thus forming a relatively regular infiltration channel.

[0020] In some embodiments, the coating device further includes a conveying roller, and the conveying roller is used to drive the target object to move and make the target object move above the coating roller.

[0021] In the above technical solution, the slurry remaining in the groove can be thrown out as far as possible before coating, so as to form a more regular infiltration channel.

[0022] In some embodiments, the conveying roller and the coating roller are arranged to rotate in opposite directions.

[0023] In the above technical solution, since the coating roller and the target object move in different directions, shear force is generated, thereby reducing wire drawing and small droplets, making the coating surface more uniform.

[0024] In some embodiments, the convex strip includes a first inclined surface and a second inclined surface arranged opposite to each other on both sides of the coating end, and the distance between the first inclined surface and the second inclined surface gradually decreases in the direction from one end of the convex strip close to the roller body to one end away from the roller body.

[0025] In the above technical solution, the distance between the first inclined surface and the second inclined surface is set to gradually decrease in the direction away from the roller body, so that the slurry remaining in the groove can be easily thrown out along the first inclined surface and the second inclined surface before coating, reducing the possibility of contact with the target object.

[0026] In some embodiments, the coating device is configured to apply the slurry to the membrane.

[0027] In the above technical solution, the impact on the energy density of the positive electrode sheet or the negative electrode sheet can be reduced.

[0028] In a second aspect, an embodiment of the present application also provides a battery production system, including the above-mentioned coating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of a battery production system provided in some embodiments of the present application;

[0031] Figure 2 A schematic diagram of the structure of a coating device provided in some embodiments of the present application;

[0032] Figure 3 A front view of a coating roller in a coating device provided in some embodiments of the present application;

[0033] Figure 4 Another front view of a coating roller in a coating device provided in some embodiments of the present application;

[0034] Figure 5 for Figure 2 A magnified view at point A;

[0035] Figure 6 A schematic diagram of the partial structure of a coating roller in a coating device provided in some embodiments of the present application.

[0036] The reference numerals of the specific embodiments are as follows:

[0037] 100. Battery production system; 200. Coating device; 300. Pole coating device; 400. Drying device; 500. Winding device;

[0038] 1. coating roller; 11. roller body; 12. convex strip; 121. coating end; 122. concave portion; 123. first convex rib; 124. second convex rib; 125. first inclined surface; 126. second inclined surface; 13. groove;

[0039] 2. Slurry storage unit; 21. Slurry storage tank;

[0040] 3. Conveyor roller;

[0041] 4. Target object;

[0042] 5. Slurry. DETAILED DESCRIPTION

[0043] 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 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.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings 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.

[0045] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places 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.

[0046] 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.

[0047] 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.

[0048] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0049] The term “plurality” used in this application refers to two or more (including two).

[0050] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0051] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode ear connected to the positive coating area. The positive coating area is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

[0052] The electrode assembly of the battery cell needs to be hot-pressed and shaped before assembly. After shaping, the gaps between the positive electrode sheet, diaphragm and negative electrode sheet of the electrode assembly are very small. The small gap hinders the electrolyte from penetrating into the electrode sheet and diaphragm, resulting in poor wetting of the electrode assembly.

[0053] In view of this, the present application provides a coating device, which arranges a plurality of convex strips at intervals on the outer peripheral side of the roller body, and uses the coating ends of the convex strips to apply slurry to the diaphragm or the electrode piece, so that the coatings applied on the diaphragm or the electrode piece are arranged at intervals. In this way, a fast penetration channel of the electrolyte can be formed between the arranged coatings at intervals, thereby improving the wetting effect of the electrode assembly.

[0054] Figure 1 A schematic diagram of the structure of a battery production system provided in some embodiments of the present application, Figure 2 A schematic diagram of the structure of a coating device provided in some embodiments of the present application.

[0055] like Figure 1 and Figure 2 As shown, the battery production system 100 includes a coating device 200 for coating a slurry 5 onto a target object 4 .

[0056] Exemplarily, the battery production system 100 further includes a pole piece coating device 300, which is used to coat the active material on at least one side of the current collector.

[0057] Exemplarily, the battery production system 100 further includes a drying device 400 , which is located downstream of the electrode sheet coating device 300 and is used to dry the current collector coated with the active material to form a dried electrode sheet.

[0058] Exemplarily, the battery production system 100 further includes a winding device 500 or a stacking device. The winding device 500 is located downstream of the drying device 400 and is used to wind the positive electrode sheet, the separator and the negative electrode sheet to form an electrode assembly. The stacking device is used to stack the positive electrode sheet, the separator and the negative electrode sheet to form an electrode assembly.

[0059] The upstream or downstream mentioned above or below in the embodiments of the present application refers to the production sequence of battery cells, and is not limited to the spatial arrangement sequence.

[0060] like Figure 2 As shown, an embodiment of the present application provides a coating device 200, which includes a coating roller 1 and a slurry storage unit 2. The coating roller 1 includes a roller body 11 and a plurality of convex strips 12 arranged on the outer peripheral side of the roller body 11, the plurality of convex strips 12 are arranged in sequence at intervals, and the arrangement direction of the plurality of convex strips 12 intersects with the extension direction of the convex strips 12, and the convex strips 12 include a coating end 121 that is away from the roller body 11; the slurry storage unit 2 is used to store slurry 5 and provide slurry 5 to the coating end 121, wherein the coating end 121 is used to apply the slurry 5 to the target object 4, and a groove 13 is formed between two adjacent convex strips 12 and the roller body 11 so that the slurry is applied to the target object 4 at intervals.

[0061] The target object 4 of the embodiment of the present application may be a diaphragm, or a positive electrode sheet or a negative electrode sheet. Optionally, the target object 4 is a diaphragm, and the coating formed on the diaphragm may be a ceramic coating or a polymer coating.

[0062] The roller body 11 of the coating device 200 of the embodiment of the present application may be a cylindrical structure, and a plurality of convex strips 12 are arranged at intervals on the outer circumference of the roller body 11 .

[0063] The cross-section of the convex strip 12 in the extension direction of the embodiment of the present application may be in the shape of a rectangle or a trapezoid, etc. Optionally, the shapes and sizes of the plurality of convex strips 12 are the same.

[0064] The convex strips 12 of the embodiment of the present application may extend along the axial direction of the roller body 11 , or may form an angle with the axial direction of the roller body 11 , and extend in an arc shape, or extend in a spiral shape, or extend in other shapes.

[0065] The convex strips 12 of the embodiment of the present application may be provided on a portion of the roller body 11 in the axial direction, or may be provided on the entire roller body 11 in the axial direction.

[0066] The spacings between the plurality of ridges 12 in the embodiment of the present application may be the same or different.

[0067] In the embodiment of the present application, the protrusion heights of the plurality of protrusions 12 relative to the roller body 11 may be the same or different.

[0068] The slurry storage unit 2 of the embodiment of the present application can be located on the outside of the coating roller 1 to provide slurry 5 to the coating end 121; it can also be set inside the roller body 11 and communicated with the coating end 121 to directly provide slurry 5 to the coating end 121.

[0069] The coating end 121 of the embodiment of the present application coats the slurry 5 on the target object 4, while the groove 13 does not play a coating role. There is no slurry 5 in the groove 13 or a small amount of slurry 5 may remain in the process of contact with the slurry 5, but it can hardly play a coating role.

[0070] The shape of the groove 13 in the embodiment of the present application is determined according to the shapes of two adjacent convex strips 12 .

[0071] The coating device 200 of the embodiment of the present application is provided with a coating roller 1 having convex strips 12, and the coating end 121 of the convex strips 12 is used to coat the target object 4, and a groove 13 not used for coating is formed between two adjacent convex strips 12, so that the slurry is coated on the target object at intervals, that is, the slurry coatings formed on the target object 4 are arranged at intervals. In this way, a rapid penetration channel for the electrolyte can be formed between two adjacent slurry coatings, thereby improving the wetting effect of the electrode assembly.

[0072] Figure 3 A front view of a coating roller in a coating device provided in some embodiments of the present application.

[0073] See also Figure 3 In some embodiments, the extending direction of the convex strip 12 intersects with the circumferential direction of the roller body 11 .

[0074] The extending direction of the convex strip 12 of the embodiment of the present application may be perpendicular to the circumferential direction of the roller body 11, that is, the convex strip 12 extends along the axial direction of the roller body 11. The extending direction of the convex strip 12 may form an angle with the circumferential direction of the roller body 11, thereby extending in a spiral shape.

[0075] With such arrangement, a wetting channel having an angle with the tape-walking direction is formed in the tape-walking direction of the target object 4 . This wetting channel facilitates rapid infiltration of the electrolyte for the electrode assembly wound along the tape-walking direction.

[0076] In some embodiments, the plurality of convex strips 12 extend along the axial direction of the roller body 11 and are arranged along the circumferential direction of the roller body 11 .

[0077] The plurality of convex strips 12 in the embodiment of the present application all extend along the axial direction of the roller body 11 , that is, each convex strip 12 extends in a straight strip shape along the axial direction of the roller body 11 .

[0078] As a result, the wetting channels formed between the coatings extend in the height direction for the wound electrode assembly, further facilitating faster wetting.

[0079] Figure 4 Another front view of the coating roller in the coating device provided in some embodiments of the present application.

[0080] See also Figure 4 In some embodiments, the convex strips 12 are arranged in a circle along the circumferential direction of the roller body 11 .

[0081] The convex strips 12 of the embodiment of the present application are arranged in a circle along the circumferential direction of the roller body 11 , that is, the convex strips 12 surround the roller body 11 in a circle, and a plurality of convex strips 12 are arranged at intervals along the axial direction of the roller body 11 .

[0082] With such arrangement, for a laminated electrode assembly, the formed wetting channel extends in the horizontal direction or in the vertical direction, so the path is shorter, facilitating rapid wetting.

[0083] Figure 5 for Figure 2 Enlarged view at A.

[0084] See also Figure 5 In some embodiments, the plurality of convex strips 12 are arranged at equal intervals, and / or the protrusion heights of the plurality of convex strips 12 relative to the roller body 11 are the same.

[0085] The protruding height of the convex strip 12 relative to the roller body 11 in the embodiment of the present application refers to the height of the convex strip 12 protruding from the roller body 11 in the radial direction of the roller body 11, wherein Figure 5 The h1 in FIG. 1 represents the protruding height of one of the convex strips 12 relative to the roller body 11 .

[0086] The plurality of convex strips 12 in the embodiment of the present application are arranged at equal intervals, that is, the distance between any two adjacent convex strips 12 is equal.

[0087] Optionally, the shapes and sizes of the plurality of ridges 12 are the same.

[0088] By arranging the plurality of convex strips 12 at equal intervals, the widths of the plurality of wetting channels formed are the same, thereby reducing the difference in wetting effects in different regions of the electrode assembly and facilitating the control of the wetting effect.

[0089] By setting the protruding heights of the plurality of convex strips 12 relative to the roller body 11 to be the same, the thickness of the slurry coating formed on the target object 4 is substantially the same, thereby improving the coating consistency.

[0090] Figure 6 A schematic diagram of the partial structure of a coating roller in a coating device provided in some embodiments of the present application.

[0091] See also Figure 6 In some embodiments, the coating end 121 is provided with a plurality of recesses 122 , and the plurality of recesses 122 are used to carry the slurry 5 and coat the slurry 5 on the target object 4 .

[0092] The recesses 122 of the coating end 121 of the embodiment of the present application are relatively small in size and can be arranged in an array or in a random arrangement.

[0093] The shapes of the openings of the plurality of recesses 122 in the embodiment of the present application may be the same or different.

[0094] Optionally, the recessed depths of the plurality of recesses 122 are the same.

[0095] A plurality of recesses 122 are provided on the coating end 121 , and the recesses 122 increase the contact area with the slurry 5 , so that the slurry 5 can be better carried for coating.

[0096] In some embodiments, the coating end 121 includes a plurality of first convex ribs 123 disposed in parallel and a plurality of second convex ribs 124 disposed in parallel. The plurality of first convex ribs 123 and the plurality of second convex ribs 124 intersect to form a plurality of recesses 122 .

[0097] The plurality of first convex ribs 123 and the plurality of second convex ribs 124 of the embodiment of the present application cross to form a grid structure.

[0098] A grid structure is formed at the coating end 121 , so that the number of the recesses 122 can be increased, thereby improving the material loading capacity of the coating end 121 .

[0099] In some embodiments, the slurry storage unit 2 includes a storage tank 21 , the storage tank 21 is located below the coating roller 1 , and the coating end 121 is used to contact the slurry 5 in the storage tank 21 .

[0100] The storage tank 21 is arranged below the coating roller 1. In this way, even if the bottom wall and side wall of the groove 13 are in contact with the slurry 5, during the rotation of the coating roller 1, the residual slurry 5 in the groove 13 will be thrown out under the action of gravity, and it is difficult to be coated on the target object 4, thereby forming a relatively regular infiltration channel.

[0101] In some embodiments, the coating device 200 further includes a conveying roller 3 , which is used to drive the target object 4 to move and enable the target object 4 to move above the coating roller 1 .

[0102] The conveying roller 3 in the embodiment of the present application may be located above the target object 4 or below the target object 4 .

[0103] The conveying roller 3 and the coating roller 1 of the embodiment of the present application cooperate to make the target object 4 contact with the coating end 121. For example, the conveying roller 3 is used to determine the belt path of the target object 4, and then the coating roller 1 is pressed against the lower surface of the target object 4, so that the target object 4 contacts with the coating end 121 for easy coating.

[0104] The conveying roller 3 is arranged so that the target object 4 is located above the coating roller 1, so that the slurry 5 remaining in the groove 13 can be thrown out as far as possible before coating, thereby forming a more regular infiltration channel.

[0105] In some embodiments, the conveying roller 3 and the coating roller 1 rotate in opposite directions.

[0106] The conveying roller 3 of the embodiment of the present application rotates in opposite directions to the coating roller 1 , and the coating roller 1 rotates in opposite directions to the moving direction of the target object 4 .

[0107] Since the coating roller 1 and the target object 4 move in different directions, shear force is generated, thereby reducing wire drawing and small droplets, making the coating surface more uniform.

[0108] In some embodiments, the protruding height of the convex strip 12 relative to the roller body 11 is h1, and h1 satisfies: 5mm≤h1≤10mm.

[0109] Optionally, h1 can be 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0110] Limiting the value of h1 to be greater than or equal to 5 mm increases the depth of the groove 13 and reduces the possibility that the slurry 5 that may remain in the groove 13 contacts the target object 4. Limiting the value of h1 to be less than or equal to 10 mm reduces production costs.

[0111] In some embodiments, h1 satisfies: 7 mm ≤ h1 ≤ 9 mm.

[0112] Optionally, h1 can be 7mm, 7.5mm, 8mm, 8.5mm or 9mm.

[0113] Further limiting the value of h1 to greater than or equal to 7 mm further increases the depth of the groove 13, reducing the possibility of the slurry 5 remaining in the groove 13 contacting the target object 4. Further limiting the value of h1 to less than or equal to 9 mm reduces production costs.

[0114] In some embodiments, the convex strip 12 includes a first inclined surface 125 and a second inclined surface 126 relatively arranged on both sides of the coating end 121, and the distance between the first inclined surface 125 and the second inclined surface 126 gradually decreases in the direction from the end of the convex strip 12 close to the roller body 11 to the end away from the roller body 11.

[0115] The first inclined surface 125 of the embodiment of the present application can be a plane, a curved surface, or an irregularly shaped surface combining a plane and a curved surface; the second inclined surface 126 can be a plane, a curved surface, or an irregularly shaped surface combining a plane and a curved surface.

[0116] The distance between the first inclined surface 125 and the second inclined surface 126 is set to gradually decrease in the direction away from the roller body 11, so that the slurry 5 remaining in the groove 13 can be easily thrown out along the first inclined surface 125 and the second inclined surface 126 before coating, reducing the possibility of contact with the target object 4.

[0117] In some embodiments, the coating apparatus 200 is configured to apply the slurry to the membrane.

[0118] In this way, the impact on the energy density of the positive electrode or the negative electrode can be reduced.

[0119] In some embodiments, the coating device 200 is configured to coat the slurry on one side of the diaphragm.

[0120] Coating the slurry on one side of the separator can reduce the volume occupied by the slurry coated on the separator and increase the energy density of the battery cell.

[0121] The embodiment of the present application also provides a battery production system 100 , including the above-mentioned coating device 200 .

[0122] See also Figure 2-Figure 6The embodiment of the present application provides a coating device 200, which includes a coating roller 1 and a slurry storage unit 2. The coating roller 1 includes a roller body 11 and a plurality of convex strips 12 arranged on the outer peripheral side of the roller body 11. The plurality of convex strips 12 are arranged in sequence at intervals, and the arrangement direction of the plurality of convex strips 12 intersects with the extension direction of the convex strips 12. The convex strips 12 include a coating end 121 away from the roller body 11. The slurry storage unit 2 is used to store slurry 5 and provide slurry 5 to the coating end 121, wherein the coating end 121 is used to apply the slurry 5 to the target object 4. A groove 13 is formed between two adjacent convex strips 12 and the roller body 11, so that the slurry is applied to the target object 4 at intervals. The plurality of convex strips 12 extend along the axial direction of the roller body 11 and are arranged along the circumferential direction of the roller body 11. The plurality of convex strips 12 are arranged at equal intervals, and the protruding heights of the plurality of convex strips 12 relative to the roller body 11 are the same. The coating end 121 is provided with a plurality of recesses 122, and the plurality of recesses 122 are used to carry the slurry 5 and apply the slurry 5 to the target object 4. The slurry storage unit 2 includes a storage tank 21, and the storage tank 21 is located below the coating roller 1. The coating end 121 is used to contact the slurry 5 in the storage tank 21. The coating device 200 also includes a conveying roller 3, and the conveying roller 3 is used to drive the target object 4 to move, and make the target object 4 move above the coating roller 1.

[0123] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A coating device, characterized in that: include: A coating roller, the coating roller comprising a roller body and a plurality of convex strips arranged on the outer peripheral side of the roller body, the plurality of convex strips are arranged in sequence and spaced apart, the arrangement direction of the plurality of convex strips intersects with the extension direction of the convex strips, and the convex strips include a coating end away from the roller body; a slurry storage unit, used for storing slurry and providing slurry to the coating end; The coating end is provided with a plurality of recesses for carrying the slurry and coating the slurry on the target object, and a groove is formed between two adjacent convex strips and the roller body so that the slurry is coated on the target object at intervals.

2. The coating device according to claim 1, characterized in that: An extending direction of the convex strips intersects with a circumferential direction of the roller body.

3. The coating device according to claim 2, characterized in that: The plurality of convex strips extend along the axial direction of the roller body and are arranged along the circumferential direction of the roller body.

4. The coating device according to claim 1, characterized in that: The convex strips are arranged in a circle along the circumferential direction of the roller body.

5. The coating device according to claim 1, characterized in that: The plurality of convex strips are arranged at equal intervals, and / or the plurality of convex strips have the same protruding height relative to the roller body.

6. The coating device according to claim 1, characterized in that: The coating end includes a plurality of first convex ribs arranged in parallel and a plurality of second convex ribs arranged in parallel, and the plurality of first convex ribs and the plurality of second convex ribs are crossed to form a plurality of the concave portions.

7. The coating device according to any one of claims 1 to 6, characterized in that: The slurry storage unit comprises a storage tank, the storage tank is located below the coating roller, and the coating end is used to contact the slurry in the storage tank.

8. The coating device according to claim 7, characterized in that: The coating device further comprises a conveying roller, and the conveying roller is used to drive the target object to move and make the target object move above the coating roller.

9. The coating device according to claim 8, characterized in that: The conveying roller and the coating roller are arranged to rotate in opposite directions.

10. The coating device according to any one of claims 1 to 6, characterized in that: The convex strip includes a first inclined surface and a second inclined surface arranged opposite to each other on both sides of the coating end, and the distance between the first inclined surface and the second inclined surface gradually decreases in the direction from one end of the convex strip close to the roller body to one end away from the roller body.

11. The coating device according to claim 1, characterized in that: The coating device is configured to apply the slurry to the separator.

12. A battery production system, characterized in that: The coating device comprises the coating device described in any one of claims 1 to 11.

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