Coating device, battery processing equipment, pole piece, battery monomer and battery

Abstract

The utility model relates to a coating device, battery processing equipment, a pole piece, a battery monomer and a battery. The coating device comprises a first roller, a second roller and a third roller, the second roller is axially parallel to the first roller, and a containing gap is formed between the second roller and the first roller in a spaced mode in the direction intersecting with the axial direction; the third roller is axially parallel to the first roller and the second roller, and a coating gap is formed between the third roller and the first roller and / or the second roller in the direction intersecting with the axial direction; and the surface roughness of the third roller is different from the surface roughness of the corresponding first roller or second roller. The surface roughness of the third roller is different from the surface roughness of the corresponding first roller or second roller, powder can be evenly flattened through the third roller, the first roller and / or the second roller are / is evenly covered with the powder, then the first roller and / or the second roller can transfer the powder on the roller face of the first roller and / or the second roller to a base material, and therefore the powder can be evenly flattened. And therefore, uniform coating of the powder on the base material is realized.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a coating device, battery processing equipment, pole pieces, battery cells and batteries. Background Art

[0002] The pole piece is an important component of the electrochemical reaction in the battery cell structure. During the production process, active materials need to be coated on the substrate to form the pole piece. However, when coating the active material on the substrate, the active material is often not evenly smoothed, resulting in uneven distribution of the active material on the substrate, thus affecting the performance of the pole piece finally formed. Utility Model Content

[0003] Based on this, it is necessary to provide a coating device, battery processing equipment, pole piece, battery cell and battery to address the problem that the active material is not evenly smoothed during the coating process, resulting in uneven distribution of the active material on the substrate.

[0004] In a first aspect, the present application provides a coating device for coating an active substance on a substrate, the coating device comprising:

[0005] First roller;

[0006] A second roller is arranged parallel to the axial direction of the first roller and is spaced from the first roller in a direction intersecting the axial direction to form a receiving gap for receiving the substrate; and

[0007] The third roller is arranged parallel to the axial direction of the first roller and the second roller, and is spaced from the first roller and / or the second roller in a direction intersecting the axial direction to form a coating gap for filling the powder;

[0008] The surface roughness of the third roller is different from the surface roughness of the corresponding first roller or second roller.

[0009] Through the above structure, since the surface roughness of the third roller is different from the surface roughness of the corresponding first roller or second roller, the powder can be evenly smoothed by the third roller so that the powder is evenly covered on the first roller and / or the second roller. Then, the first roller and / or the second roller can transfer the powder on its roller surface to the substrate, thereby achieving uniform coating of the powder on the substrate.

[0010] In some embodiments, the diameter of the third roller is smaller than the diameter of the corresponding first roller or second roller.

[0011] With the above structure, the powdered active material can be more evenly attached to the roller surface of the first roller or the second roller, thereby improving the uniformity of the powdered active material being transferred to the substrate.

[0012] In some embodiments, the difference between the surface roughness Ra2 of the third roller and the surface roughness Ra1 of the corresponding first roller or second roller is in the range of Ra1-Ra2≥0.05 μm.

[0013] By controlling the difference in surface roughness between the third roller and the first roller or the second roller, the powdered active material can be evenly and completely rolled onto the roller surface of the first roller or the second roller, reducing the probability of the powdered active material being adhered to the third roller, so that the powdered active material can be more thoroughly transferred to the substrate.

[0014] In some embodiments, the surface roughness of the first roller or the second roller corresponding to the third roller is less than or equal to 0.2 μm;

[0015] And / or, the surface roughness of the third roller is less than or equal to 0.07 μm.

[0016] By setting the surface roughness of the first roller, the second roller and the third roller within the above-mentioned ranges, respectively, the powdered active material can be evenly and completely rolled onto the roller surface of the first roller or the second roller, thereby reducing the probability of the powdered active material being adhered to the third roller, so that the powdered active material can be more thoroughly transferred to the substrate.

[0017] In some embodiments, the coating device further includes a first adjusting mechanism connected to the third roller, and the first adjusting mechanism is used to drive the third roller away from or close to the corresponding first roller or the second roller to adjust the size of the coating gap.

[0018] The size of the coating gap can be flexibly adjusted by the first adjustment mechanism to achieve different coating amounts of the powdered active substance.

[0019] In some embodiments, the first adjustment mechanism is rotatably connected to the first bracket and the second bracket around a rotating shaft, the first bracket and the second bracket both have a connecting end and an operating end, and the rotating shaft is located between the connecting end and the operating end;

[0020] The third roller is rotatably connected to the connecting end around its own axis, and the operating end is used to drive the first bracket and the second bracket to rotate relatively under the action of external force.

[0021] Through the above structure, the third roller can be more conveniently driven to move away from or closer to the corresponding first roller or second roller, and the size of the coating gap can be flexibly adjusted to achieve different coating amounts of the powdered active substance.

[0022] In some embodiments, the coating device further includes a second adjusting mechanism, at least a portion of which is disposed in the coating gap and is used to adjust a size of the coating gap in the axial direction of the third roller.

[0023] By setting up a second adjustment mechanism, the size of the coating gap in the axial direction of the third roller can be adjusted, thereby limiting the width of the powdered active material attached to the roller surface of the first roller or the second roller in the coating gap, so as to form coating areas of different widths on the substrate.

[0024] In some embodiments, the second adjustment mechanism includes a guide roller and at least two width limiting members, at least a portion of each width limiting member is disposed in the coating gap, and each width limiting member is movably disposed on the guide roller along the axial direction of the third roller to adjust the size of the coating gap in the axial direction of the third roller.

[0025] Through the above structure, the size of the coating gap in the axial direction of the third roller can be flexibly adjusted so that the width of the coating area formed by the powdered active material on the substrate meets the production requirements.

[0026] In some embodiments, the coating device also includes a first driving member and a second driving member, the first driving member is drivingly connected to the first roller and / or the second roller to drive the first roller and / or the second roller to rotate around their own axes, and the second driving member is drivingly connected to the third roller to drive the third roller to rotate around its own axes.

[0027] Through the above structure, the first roller, the second roller and the third roller can be driven to rotate independently, so as to adjust the rotation speed of the third roller relative to the first roller or the second roller, so that the third roller can better press the powdered active material onto the roller surface of the first roller or the second roller.

[0028] In a second aspect, the present application also provides a battery processing device, comprising a coating device as described above, the coating device being used to coat a powdered active substance on a substrate.

[0029] In a third aspect, the present application also provides a pole piece, which is manufactured by the coating device as described above.

[0030] In some embodiments, the pole piece includes a substrate, and the substrate is disposed through the receiving gap;

[0031] The surface roughness of the substrate is greater than the surface roughness of the first roller and / or the second roller.

[0032] In a fourth aspect, the present application also provides a battery cell, comprising the pole piece as described above.

[0033] In a fifth aspect, the present application also provides a battery, comprising the battery cell as described above.

[0034] The above-mentioned coating device, battery processing equipment, pole piece, battery cell and battery, the substrate is arranged in the accommodating gap between the first roller and the second roller, and the powder is first filled into the coating gap. Since the surface roughness of the third roller is different from the surface roughness of the corresponding first roller or second roller, the powder can be evenly smoothed by the third roller so that the powder is evenly covered on the first roller and / or the second roller. Then, the first roller and / or the second roller can transfer the powder on its roller surface to the substrate, thereby achieving uniform coating of the powder on the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG. 1 is a schematic diagram of the overall structure of a coating device according to one or more embodiments.

[0036] FIG. 2 is a schematic structural diagram of a first adjustment mechanism and a second adjustment mechanism in a coating device according to one or more embodiments.

[0037] FIG. 3 is a schematic structural diagram of a second adjustment mechanism in a coating device according to one or more embodiments.

[0038] FIG. 4 is a schematic structural diagram of a coating device according to one or more embodiments.

[0039] FIG. 5 is a schematic diagram of a battery processing device according to one or more embodiments.

[0040] Explanation of the accompanying drawings: 1000, battery processing equipment; 100, coating device; 200, substrate; 300, unwinding device; 400, unloading device; 500, winding device; 301, unwinding roller; 302, first tension roller; 501, second tension roller; 502, winding roller; 10, first roller; 20, second roller; 30, third roller; 40, accommodating gap; 50, coating gap; 60, first adjusting mechanism; 70, second adjusting mechanism; 80, first driving member; 90, second driving member; 61, first bracket; 62, second bracket; 63, connecting end; 64, operating end; 65, rotating shaft; 71, guide roller; 72, width limiting member. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0042] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0043] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0045] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0047] At present, 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 and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0048] The battery is composed of one or more battery cells. For each battery, the battery cells that make up the battery can be connected in series, in parallel, or in mixed connection. Mixed connection means that the battery cells are connected in series and in parallel.

[0049] A battery cell is the smallest unit that makes up a battery. The structure of a battery cell includes a shell, an electrolyte, and an electrode assembly. The electrode assembly is the part that undergoes electrochemical reactions in the battery cell. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. Both the positive electrode sheet and the negative electrode sheet are formed by coating an active material on a substrate. By providing the active material, the electrode assembly can smoothly undergo an electrochemical reaction.

[0050] Generally, the active material coated on the substrate is in a colloidal or liquid state, that is, the active material is an active material slurry. The active material slurry has good adhesion to the substrate, and can more easily achieve uniform distribution of the active material slurry on the substrate.

[0051] However, after the active material slurry is coated on the substrate and the electrode is formed, the electrode needs to be dried before it can be used. The size of the electrode roll is usually large, and the drying device is often large in size, which not only takes up a large installation space, but also increases the production time of the electrode.

[0052] Based on this, the active material is improved into a powdery material, and a binder can be added to the powder to achieve the adhesion of the powder to the substrate. After the powder is coated on the substrate, the formed pole piece can be directly used in the next process without drying treatment, which can effectively improve the production efficiency of the pole piece.

[0053] However, the current coating device cannot evenly smooth the powder when coating it on the substrate, which results in uneven distribution of the powdered active material on the substrate, affecting the performance of the final electrode.

[0054] Based on the above considerations, in order to solve the problem that the active substance is not evenly smoothed during the coating process, resulting in uneven distribution of the active substance on the substrate, a coating device is provided in one or more embodiments of the present application, and the substrate is passed through the accommodating gap between the first roller and the second roller. The powder is first filled into the coating gap. Since the surface roughness of the third roller is different from the surface roughness of the corresponding first roller or the second roller, the powder can be evenly smoothed by the third roller so that the powder is evenly covered on the first roller and / or the second roller. Then, the first roller and / or the second roller can transfer the powder on its roller surface to the substrate, thereby achieving uniform coating of the powder on the substrate.

[0055] Referring to FIG. 1 , an embodiment of the present application provides a coating device 100 for coating an active substance on a substrate 200. The coating device 100 includes a first roller 10, a second roller 20, and a third roller 30. The second roller 20 is arranged axially parallel to the first roller 10, and is spaced from the first roller 10 in a direction intersecting the axial direction to form a receiving gap 40 for accommodating the substrate 200. The third roller 30 is arranged axially parallel to the first roller 10 and the second roller 20, and is spaced from the first roller 10 and / or the second roller 20 in a direction intersecting the axial direction to form a coating gap 50 for filling powder. The surface roughness of the third roller 30 is different from the surface roughness of the corresponding first roller 10 or second roller 20.

[0056] It should be noted that the coating device 100 provided in the present application can be used to coat a powdered active material on a substrate 200, and can also be used to coat a slurry-like active material on a substrate 200. When the powdered active material is coated on the substrate 200, a binder can be added to the powdered active material so that the powdered active material can be stably attached to the substrate 200.

[0057] The first roller 10, the second roller 20 and the third roller 30 are all arranged as cylindrical rollers, and the axial directions of the first roller 10, the second roller 20 and the third roller 30 are all arranged in parallel, that is, the first roller 10, the second roller 20 and the third roller 30 are parallel to each other. The first roller 10 and the second roller 20 are arranged in a direction perpendicular to the axial direction, and a receiving gap 40 is formed between the first roller 10 and the second roller 20, and the substrate 200 can be passed through the receiving gap 40 and run in the receiving gap 40.

[0058] The third roller 30 can be spaced apart from one of the first roller 10 and the second roller 20 in a direction perpendicular to the axial direction to form a coating gap 50, or two third rollers 30 can be provided, and they can be spaced apart from the first roller 10 and the second roller 20 in a direction perpendicular to the axial direction to form a coating gap 50 between the third roller 30 and the first roller 10, and another coating gap 50 between the third roller 30 and the second roller 20.

[0059] When a coating gap 50 is formed between the third roller 30 and one of the first roller 10 and the second roller 20, single-sided coating of the substrate 200 can be achieved. For example, when the third roller 30 is spaced from the first roller 10 in a direction perpendicular to the axial direction to form a coating gap 50, the coating gap 50 is first filled with powdered active material, and the third roller 30 and the first roller 10 rotate relative to each other, so that the powdered active material is evenly smoothed by the third roller 30, so that the powdered active material can be evenly attached to the roller surface of the first roller 10.

[0060] Furthermore, the substrate 200 is inserted into the accommodation gap 40 between the first roller 10 and the second roller 20. As the first roller 10 and the second roller 20 rotate relative to each other, the powdered active material on the roller surface of the first roller 10 can be transferred to the substrate 200, so that the powdered active material can be evenly coated on the substrate 200, thereby achieving single-sided coating of the substrate 200.

[0061] When a coating gap 50 is formed between the third roller 30 and the first roller 10 and the second roller 20 respectively, the third roller 30 can evenly transfer the powdered active material to the first roller 10 and the second roller 20, and then evenly coat the powdered active material on the opposite side surfaces of the substrate 200 through the first roller 10 and the second roller 20, thereby achieving double-sided coating of the substrate 200.

[0062] In addition, since the surface roughness of the third roller 30 is different from the surface roughness of the corresponding first roller 10 or second roller 20, the third roller 30 can evenly and completely roll the powdered active material in the coating gap 50 onto the roller surface of the first roller 10 or the second roller 20, so that the powdered active material is evenly attached to the roller surface of the first roller 10 or the second roller 20, and then the powdered active material is evenly coated on the substrate 200 through the first roller 10 or the second roller 20.

[0063] Through the above structure, since the surface roughness of the third roller 30 is different from the surface roughness of the corresponding first roller 10 or second roller 20, the powder can be evenly smoothed by the third roller 30 so that the powder is evenly covered on the first roller 10 and / or the second roller 20. Then, the first roller 10 and / or the second roller 20 can transfer the powder on its roller surface to the substrate 200, thereby achieving uniform coating of the powder on the substrate 200.

[0064] In some embodiments, the diameter of the third roller 30 is smaller than the diameter of the corresponding first roller 10 or second roller 20 .

[0065] The diameter of the third roller 30 is set to be smaller than the diameter of the corresponding first roller 10 or second roller 20. When filling the powdered active material into the coating gap 50, the third roller 30 can smooth and roll the powdered active material more thoroughly, so that the powdered active material is more evenly adhered to the roller surface of the first roller 10 or the second roller 20.

[0066] Thus, through the above structure, the powdered active material can be more evenly attached to the roller surface of the first roller 10 or the second roller 20 , thereby improving the uniformity of the powdered active material being transferred to the substrate 200 .

[0067] In some embodiments, the difference between the surface roughness Ra2 of the third roller 30 and the surface roughness Ra1 of the corresponding first roller 10 or second roller 20 is in the range of Ra1-Ra2≥0.05 μm.

[0068] By controlling the difference in surface roughness between the third roller 30 and the first roller 10 or the second roller 20, the powdered active material can be evenly and completely rolled onto the roller surface of the first roller 10 or the second roller 20, thereby reducing the probability of the powdered active material being adhered to the third roller 30, so that the powdered active material can be more thoroughly transferred to the substrate 200.

[0069] In some embodiments, the surface roughness of the first roller 10 or the second roller 20 corresponding to the third roller 30 is less than or equal to 0.2 μm. And / or the surface roughness of the third roller 30 is less than or equal to 0.07 μm.

[0070] Specifically, the surface roughness of the third roller 30 is less than the surface roughness of the corresponding first roller 10 or second roller 20. In addition, by setting the surface roughness of the first roller 10, the second roller 20, and the third roller 30 within the above range, the powdered active material can be uniformly and completely rolled onto the roller surface of the first roller 10 or the second roller 20, reducing the probability of the powdered active material being adhered to the third roller 30, so that the powdered active material can be more thoroughly transferred to the substrate 200.

[0071] In some embodiments, the coating device 100 further includes a first adjustment mechanism 60 connected to the third roller 30 , and the first adjustment mechanism 60 is used to drive the third roller 30 away from or close to the corresponding first roller 10 or second roller 20 to adjust the size of the coating gap 50 .

[0072] When the first adjustment mechanism 60 drives the third roller 30 away from the corresponding first roller 10 or second roller 20, the size of the coating gap 50 increases, so that the filling amount of powdered active material that can be filled in the coating gap 50 increases, thereby achieving different coating amounts of powdered active material.

[0073] Specifically, the substrate 200 can be made of, but is not limited to, copper foil, aluminum foil or other composite materials. The size of the coating gap 50 can be flexibly adjusted according to the actual material of the substrate 200 or the degree of adhesion of the powdered active substance on the substrate 200 to achieve different coating amounts.

[0074] Thus, the size of the coating gap 50 can be flexibly adjusted through the first adjustment mechanism 60 to achieve different coating amounts of the powdered active material.

[0075] Please refer to FIG. 1 and FIG. 2 together. In some embodiments, the first adjustment mechanism 60 includes a first bracket 61 and a second bracket 62 rotatably connected around a rotating shaft 65. The first bracket 61 and the second bracket 62 both have a connecting end 63 and an operating end 64. The rotating shaft 65 is located between the connecting end 63 and the operating end 64. The third roller 30 is rotatably connected to the connecting end 63 around its own axis, and the operating end 64 is used to drive the first bracket 61 and the second bracket 62 to rotate relative to each other under the action of an external force.

[0076] Specifically, the first bracket 61 and the second bracket 62 are both configured to be long strips, and the rotating shaft 65 is connected to the midpoint of the longitudinal direction of the first bracket 61 and the second bracket 62. Therefore, when the first bracket 61 and the second bracket 62 are rotatably connected through the rotating shaft 65, the first bracket 61 and the second bracket 62 are combined to form a scissor-like structure.

[0077] At this time, the two opposite ends of the rotating shaft 65 on the first bracket 61 and the second bracket 62 are respectively formed as a connecting end 63 and an operating end 64. The connecting end 63 can be rotatably connected to the third roller 30 by setting a roller.

[0078] Applying external force to the operating end 64 can make the first bracket 61 and the second bracket 62 rotate relative to each other around the rotating shaft 65, so that the connecting end 63 of the first bracket 61 and the connecting end 63 of the second bracket 62 move away from or closer to each other. Therefore, the connecting end 63 of the first bracket 61 and the connecting end 63 of the second bracket 62 can drive the third roller 30 to move away from or closer to the corresponding first roller 10 or second roller 20, thereby achieving the purpose of adjusting the size of the coating gap 50.

[0079] In addition, it can be understood that the first adjustment mechanism 60 can also include other structures, such as a telescopic cylinder, wherein the telescopic end of the telescopic cylinder is connected to the third roller 30, and the third roller 30 is driven away from or close to the corresponding first roller 10 or second roller 20 by controlling the extension or contraction of the telescopic cylinder, thereby achieving the purpose of adjusting the size of the coating gap 50.

[0080] Therefore, through the above structure, the third roller 30 can be more conveniently driven to move away from or close to the corresponding first roller 10 or second roller 20, and the size of the coating gap 50 can be flexibly adjusted to achieve different coating amounts of the powdered active material.

[0081] In some embodiments, the coating device 100 further includes a second adjustment mechanism 70 , at least a portion of which is disposed in the coating gap 50 and is used to adjust the size of the coating gap 50 in the axial direction of the third roller 30 .

[0082] It should be noted that when coating is performed on different substrates 200 , the coating width on the substrate 200 is different. That is, it is necessary to form coating areas with different widths on the substrate 200 .

[0083] Thus, at least a portion of the second adjustment mechanism 70 is inserted into the coating gap 50, so that the second adjustment mechanism 70 limits the width of the coating gap 50 in the axial direction of the third roller 30, thereby limiting the width of the powdered active material in the coating gap 50 attached to the roller surface of the first roller 10 or the second roller 20, and finally forming coating areas of different widths on the substrate 200.

[0084] By setting up the second adjustment mechanism 70, the size of the coating gap 50 in the axial direction of the third roller 30 can be adjusted, thereby limiting the width of the powdered active material in the coating gap 50 attached to the roller surface of the first roller 10 or the second roller 20, so as to form coating areas of different widths on the substrate 200.

[0085] As shown in Figures 1, 2 and 3, in some embodiments, the second adjustment mechanism 70 includes a guide roller 71 and at least two width limiting members 72, at least a portion of each width limiting member 72 is disposed in the coating gap 50, and each width limiting member 72 is movably disposed on the guide roller 71 along the axial direction of the third roller 30 to adjust the size of the coating gap 50 in the axial direction of the third roller 30.

[0086] Specifically, the second adjustment mechanism 70 includes two width limiting members 72 . The two width limiting members 72 have insertion portions inserted into the coating gap 50 , and the shapes of the insertion portions are configured to match the shape of the coating gap 50 .

[0087] The two width limiting members 72 can be detachably arranged on the guide roller 71 by bolts, so as to adjust the position of the width limiting member 72 on the guide roller 71 along the axial direction of the third roller 30, thereby realizing the movable arrangement of the width limiting member 72 on the guide roller 71. Of course, the width limiting member 72 can also be movably arranged by other structures, such as adjusting cylinders or adjusting screws, which will not be described in detail here.

[0088] Thus, when the inserting portion is inserted into the coating gap 50 , the coating gap 50 can be limited in width along the axial direction of the third roller 30 so that the width of the coating gap 50 meets the coating requirements, so as to form a coating area that meets the requirements on the substrate 200 .

[0089] Of course, if it is necessary to form a plurality of coating areas spaced apart from each other on the substrate 200 , the second adjustment mechanism 70 may also include a plurality of width limiting members 72 to form two or more coating gaps 50 , thereby forming a plurality of coating areas on the substrate 200 .

[0090] Through the above structure, the size of the coating gap 50 in the axial direction of the third roller 30 can be flexibly adjusted so that the width of the coating area formed by the powdered active material on the substrate 200 meets the production requirements.

[0091] Please refer to Figures 1 and 4 together. In some embodiments, the coating device 100 also includes a first driving member 80 and a second driving member 90. The first driving member 80 is drivingly connected to the first roller 10 and / or the second roller 20 to drive the first roller 10 and / or the second roller 20 to rotate around their own axes. The second driving member 90 is drivingly connected to the third roller 30 to drive the third roller 30 to rotate around its own axes.

[0092] Specifically, the first driving member 80 and the second driving member 90 can be configured as driving motors, and the first driving member 80 is used to drive the first roller 10 and / or the second roller 20 to rotate, and the second driving member 90 is used to drive the third roller 30 to rotate. That is, the third roller 30 is independently controlled from the first roller 10 and the second roller 20, so as to adjust the rotation speed of the third roller 30 relative to the first roller 10 or the second roller 20, so that the third roller 30 can better calender the powdered active material onto the roller surface of the first roller 10 or the second roller 20.

[0093] Therefore, through the above structure, the first roller 10, the second roller 20 and the third roller 30 can be driven to rotate independently, so as to adjust the rotation speed of the third roller 30 relative to the first roller 10 or the second roller 20, so that the third roller 30 can better press the powdered active material onto the roller surface of the first roller 10 or the second roller 20.

[0094] As shown in FIG. 5 , based on the same concept as the above-mentioned coating device 100 , the present application also provides a battery processing device 1000 , including the coating device 100 as described above, and the coating device 100 is used to coat the powdered active material on the substrate 200 .

[0095] Specifically, the battery processing equipment 1000 also includes a unwinding device 300, a feeding device 400 and a winding device 500, wherein the unwinding device 300 includes a feeding roller 301 and a first tension roller 302, and the substrate to be coated is sequentially wound on the feeding roller 301 and the first tension roller 302, the substrate is transported by the feeding roller 301, the substrate is tensioned by the first tension roller 302, and the substrate is transported to the coating device 100.

[0096] Furthermore, the unloading device 400 is arranged above the first roller 10 or the second roller 20, and is used to transport powder to the surface of the first roller 10 or the second roller 20. After the powder is transferred to the surface of the first roller 10 or the second roller 20 by the unloading device 400, the powder can be evenly smoothed by the third roller 30.

[0097] The winding device 500 is arranged downstream of the coating device 100 along the conveying direction of the substrate, and the winding device 500 includes a second tension roller 501 and a receiving roller 502. The second tension roller 501 tensions the substrate after coating, and then the receiving roller 502 winds up the coated substrate.

[0098] Based on the same concept as the above-mentioned coating device 100 , the present application also provides a pole piece, which is manufactured by the above-mentioned coating device 100 .

[0099] In some embodiments, the pole piece includes a substrate 200, and the substrate 200 is disposed in the receiving gap 40, so that the powdered active material is coated on the substrate 200 by the coating device 100. The surface roughness of the substrate 200 is greater than the surface roughness of the first roller 10 and / or the second roller 20.

[0100] Specifically, the substrate 200 may be made of a suitable material according to the surface roughness of the first roller 10 and the second roller 20 , so that the surface roughness of the substrate 200 is greater than that of the first roller 10 and / or the second roller 20 .

[0101] Thus, the powdered active material can be transferred from the first roller 10 or the second roller 20 to the substrate 200 more thoroughly and completely.

[0102] Based on the same concept as the above-mentioned pole piece, the present application also provides a battery cell, including the pole piece as described above.

[0103] Based on the same concept as the above-mentioned battery cell, the present application also provides a battery, comprising the above-mentioned battery cell.

[0104] According to one or more embodiments, the third roller 30 may be spaced apart from the first roller 10 in a direction perpendicular to the axial direction to form a coating gap 50. The coating gap 50 is filled with powdered active material, and the third roller 30 and the first roller 10 are controlled to rotate relative to each other, and the rotation speeds of the third roller 30 and the first roller 10 are adjusted so that the third roller 30 evenly and completely rolls the powdered active material onto the roller surface of the first roller 10.

[0105] Furthermore, the substrate 200 is conveyed through the accommodation gap 40 between the first roller 10 and the second roller 20. At the same time, the first roller 10 rotates around its own axis and transfers the powdered active material on its roller surface to the substrate 200, so that the powdered active material is evenly coated on the substrate 200.

[0106] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A coating device, characterized in that: Used to coat active substances on a substrate, the coating device comprises: First roller; A second roller is arranged parallel to the axial direction of the first roller and is spaced from the first roller in a direction intersecting the axial direction to form a receiving gap for receiving the substrate; and A third roller is arranged axially parallel to the first roller and the second roller, and is spaced from the first roller and / or the second roller in a direction intersecting the axial direction to form a coating gap for filling powder; The surface roughness of the third roller is different from the surface roughness of the corresponding first roller or second roller.

2. The coating device according to claim 1, characterized in that: The diameter of the third roller is smaller than the diameter of the corresponding first roller or second roller.

3. The coating device according to claim 1 or 2, characterized in that: The difference between the surface roughness Ra2 of the third roller and the surface roughness Ra1 of the corresponding first roller or the second roller is in the range of Ra1-Ra2≥0.05 μm.

4. The coating device according to claim 3, characterized in that: The surface roughness of the first roller or the second roller corresponding to the third roller is less than or equal to 0.2 μm; And / or, the surface roughness of the third roller is less than or equal to 0.07 μm.

5. The coating device according to claim 1, characterized in that: The coating device further includes a first adjusting mechanism connected to the third roller, and the first adjusting mechanism is used to drive the third roller to move away from or closer to the corresponding first roller or the second roller to adjust the size of the coating gap.

6. The coating device according to claim 5, characterized in that: The first adjustment mechanism is rotatably connected to a first bracket and a second bracket around a rotating shaft, the first bracket and the second bracket both have a connecting end and an operating end, and the rotating shaft is located between the connecting end and the operating end; The third roller is rotatably connected to the connecting end around its own axis, and the operating end is used to drive the first bracket and the second bracket to rotate relative to each other under the action of external force.

7. The coating device according to claim 1, characterized in that: The coating device further comprises a second adjusting mechanism, at least a portion of which is disposed in the coating gap and is used to adjust a size of the coating gap in the axial direction of the third roller.

8. The coating device according to claim 7, characterized in that: The second adjustment mechanism includes a guide roller and at least two width limiting members, at least a portion of each of the width limiting members is arranged in the coating gap, and each of the width limiting members is movably arranged on the guide roller along the axial direction of the third roller to adjust the size of the coating gap in the axial direction of the third roller.

9. The coating device according to claim 1, characterized in that: The coating device also includes a first driving member and a second driving member, the first driving member is drivingly connected to the first roller and / or the second roller to drive the first roller and / or the second roller to rotate around their own axes, and the second driving member is drivingly connected to the third roller to drive the third roller to rotate around its own axes.

10. A battery processing device, characterized in that: The coating device comprises a coating device as described in any one of claims 1 to 9, wherein the coating device is used to coat a powdered active substance on a substrate.

11. A pole piece, characterized in that: It is made by the coating device as described in any one of claims 1 to 9.

12. The pole piece according to claim 11, characterized in that: The pole piece includes a substrate, and the substrate is arranged in the accommodation gap; The surface roughness of the substrate is greater than the surface roughness of the first roller and / or the second roller.

13. A battery cell, characterized in that: Comprising a pole piece as claimed in claim 11 or 12.

14. A battery, characterized in that: Comprising the battery cell as claimed in claim 13.

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