Coating mechanism, device and method

Abstract

The invention discloses a coating mechanism, device and method. The coating mechanism comprises a coating roller which is provided with a coating channel communicating the interior and the surface of the coating roller; the paint supply assembly is used for supplying paint to the paint passage, so that the paint flows to the surface of the coating roller from the interior of the coating roller, and a first paint layer is formed; the coating scraper is used for enabling the thickness of the first coating layer to be within a preset range; the coating recycling assembly is used for collecting and recycling the coating on the coating scraper; the driving assembly is connected with the coating roller to drive the coating roller to rotate, after the coating scraper makes contact with the first coating layer, a second coating layer is formed on the surface of the coating roller, and the thickness of the second coating layer is smaller than that of the first coating layer; in a working state, the surface of the battery piece is in contact with the coating roller, and the second coating layer is separated from the coating roller and coats the surface of the battery piece to form the third coating layer. The contact time of the coating and air is shortened through the coating passage, so that the volatilization amount of the coating is reduced, and the service life of the coating is prolonged.

Description

Technical Field

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

[0002] The manufacturing process of solar cells involves a coating process, which mainly covers the coating to part or all of the surface of the cell so that the coating can be used in subsequent processes. For example, the coating is applied to the non-electroplated surface of the cell to protect the structure on the non-electroplated surface of the cell (pyramid velvet, etc.) to avoid damage to the structure in subsequent processes.

[0003] The coating process used in the photovoltaic field typically uses screen printing, where a prepared printing paste is placed on a screen template and then evenly pressed onto the cell surface using a squeegee or scraper. However, this method exposes the screen template to air, causing the coating to continuously come into contact with air. This volatilization reduces the coating's lifespan and increases production costs. Summary of the Invention

[0004] The purpose of this application is to provide a coating mechanism, device and method, which utilizes a coating passage to reduce the time the coating is in contact with air, thereby reducing the volatilization of the coating and increasing the life of the coating.

[0005] To achieve the above-mentioned purpose, the present application provides a coating mechanism, comprising: a coating roller having a coating passage connecting the interior and surface of the coating roller; a coating supply assembly for supplying coating to the coating passage so that the coating flows from the interior of the coating roller to the surface of the coating roller and forms a first coating layer; a coating scraper for making the thickness of the first coating layer within a preset range; a coating recovery assembly for collecting the coating on the coating scraper and recovering it; a driving assembly connected to the coating roller to drive the coating roller to rotate and pass through the coating scraper and the battery cell in sequence, after the coating scraper contacts the first coating layer, a second coating layer is formed on the surface of the coating roller, and the thickness of the second coating layer is less than the thickness of the first coating layer; in a working state, the surface of the battery cell contacts the coating roller, so that the second coating layer detaches from the coating roller and is applied to the surface of the battery cell, forming a third coating layer on the surface of the battery cell.

[0006] As a further improvement of the above technical solution: the paint supply assembly includes at least a feed barrel and a feed pipe; the paint passage includes a feed chamber and multiple feed channels arranged in the coating roller, and the two ends of the feed pipe are respectively connected to the feed chamber and the feed barrel, and the two ends of each of the feed channels are respectively connected to the surface of the coating roller and the feed chamber.

[0007] As a further improvement of the above technical solution: the coating roller is provided with a plurality of feed channel groups at intervals along the length, each feed channel group includes a plurality of feed channels, and the plurality of feed channels in the same group are equidistantly arranged along the circumference of the coating roller.

[0008] As a further improvement of the above technical solution: a wire mesh is provided on the coating roller, the wire mesh wraps the outer surface of the coating roller, and the first coating layer is formed on the surface of the wire mesh.

[0009] As a further improvement of the above technical solution: a mesh structure is provided in the coating roller, and the mesh structure is arranged along the inner wall of the feeding chamber, so that the coating flows through the feeding chamber, the mesh structure and the feeding channel in sequence.

[0010] As a further improvement of the above technical solution: the paint recovery component includes at least a recovery pipe, one end of which is connected to the surface of the coating scraper, and the other end is connected to the supply barrel or the storage barrel.

[0011] As a further improvement of the above technical solution: the coating scraper is set at an angle or horizontally; the end of the coating scraper in contact with the first coating layer is the highest point of the inclined position, the end of the coating scraper away from the first coating layer is funnel-shaped, and the width gradually decreases, and the end with the smallest width is connected to the recovery pipe; when the coating scraper is set horizontally, a recovery piece is provided under the coating scraper, the recovery piece is funnel-shaped, and the width gradually decreases, and the end with the smallest width is connected to the recovery pipe, and a plurality of recovery holes are opened on the coating scraper, and the plurality of recovery holes can all be covered by the end with the largest width of the recovery piece.

[0012] As a further improvement of the above technical solution: the coating mechanism can also adopt any of the following structures or a combination of two or more structures: (1) the coating recovery component at least includes a recovery pipe, one end of the recovery pipe is connected to the surface of the coating scraper, and the other end is connected to the feeding barrel or the storage barrel, and a vacuum pump is provided on the recovery pipe; (2) the coating mechanism also includes a storage barrel, and the feeding barrel and the storage barrel are connected through a storage pipe, and a filter is provided on the storage pipe; (3) one end of the feeding chamber is connected to the feeding pipe, and the other end is connected to the return pipe, and the return pipe is connected to the feeding barrel; The return pipe is provided with at least one selected from the group consisting of a valve, a pump body and a flow meter; the feed pipe is provided with at least one selected from the group consisting of a valve, a pump body and a flow meter As a further improvement of the above technical solution: both ends of the coating roller are provided with a delivery pipe connected to the feed chamber, and the ends of the two delivery pipes away from the coating roller are respectively connected to the return pipe and the feed pipe through quick connectors; a first gear is provided on the delivery pipe, and the drive assembly includes at least a drive motor and a second gear, the output shaft of the drive motor is connected to the second gear, and the first gear is meshed with the second gear.

[0013] To achieve the above-mentioned purpose, the present application provides a coating mechanism, comprising: a coating roller, wherein a feed chamber and a plurality of feed channels are provided in the coating roller, and both ends of each feed channel are respectively connected to the surface of the coating roller and the feed chamber; a coating supply assembly, comprising at least a feed barrel and a feed pipe, and both ends of the feed pipe are respectively connected to the feed barrel and the feed chamber; a coating scraper, located on one side of the coating roller, with a certain distance between the coating scraper and the coating roller; a coating recovery assembly, comprising at least a recovery pipe, and the recovery pipe is connected to the surface of the coating scraper; a drive assembly, connected to the coating roller and driving it to rotate; the coating mechanism has at least three working states, in a first working state, the surface of the coating roller is covered with coating to form a first coating layer; in a second working state, the coating scraper contacts the first coating layer and causes it to form a second coating layer, the thickness of the second coating layer being less than the thickness of the first coating layer; in a third working state, the coating roller contacts the surface of the battery cell, and the portion of the coating roller surface covered by the second coating layer is exposed.

[0014] To achieve the above-mentioned purpose, the present application also provides a coating device on the other hand, including: a pretreatment mechanism for pretreatment of the surface of the battery cell; a coating mechanism for forming a third coating layer on the surface of the battery cell; a post-treatment mechanism for post-treatment of the coating layer; a conveying mechanism for conveying the battery cell so that it passes through the pretreatment mechanism, the coating mechanism and the post-treatment mechanism in sequence; wherein the coating mechanism includes at least a coating roller, a coating supply assembly, a coating scraper, a coating recovery assembly and a drive assembly, the coating supply assembly is used to supply coating to the coating roller so that a first coating layer is formed on the surface of the coating roller; the coating scraper is used to make the thickness of the first coating layer within a preset range; the coating recovery assembly is connected to the coating scraper for collecting the coating on the coating scraper and recovering it; the drive assembly is connected to the coating roller to drive the coating roller to rotate and pass through the coating supply assembly and the coating scraper in sequence and contact the surface of the battery cell.

[0015] As a further improvement of the above technical solution: the pretreatment mechanism can adopt any of the following structures or a combination of two or more structures: (1) including a purge component, the purge component including a nozzle and a gas compressor, the nozzle and the gas compressor are connected through a purge pipe, the nozzle of the nozzle is directed toward the conveying mechanism to purge the surface of the battery cell; (2) including a spray component and a drying component arranged in sequence, the spray component including a cleaning tank and a spray head, the spray head is connected to the cleaning tank through a spray pipe, the nozzle of the spray head is directed toward the conveying mechanism to clean the surface of the battery cell, and the first drying component includes a heating element, the heating element is located above and / or below the conveying mechanism to dry the surface of the battery cell.

[0016] As a further improvement of the above technical solution: the post-processing mechanism includes a heat curing machine or a light curing machine, the heat curing machine is a hot air blower and a nozzle, the nozzle is connected to the hot air blower through a hot air duct, and the nozzle is provided with a plurality of spray holes facing the conveying mechanism to dry the third coating layer; or, the heat curing machine is a heating lamp tube, and the heating lamp tube is located above and / or below the conveying mechanism to dry the third coating layer.

[0017] To achieve the above-mentioned purpose, the present application also provides a coating device on the other hand, including the coating mechanism as described above, and also including: a pretreatment mechanism, including a purge component, or a spray component and a drying component, or a purge component, a spray component and a drying component; a post-processing mechanism, including a heat curing machine or a light curing machine; a conveying mechanism, the pretreatment mechanism, the coating mechanism and the post-processing mechanism are sequentially arranged on the conveying path of the conveying mechanism.

[0018] To achieve the above-mentioned purpose, the present application further provides a coating method, which includes providing a coating roller with a coating passage, wherein the coating passage is connected to the interior and surface of the coating roller; providing a valve on a feed pipe connected to the coating passage to control the flow direction of the coating; obtaining the time required from opening the valve to the coating passing through the coating passage to form a first coating layer on the surface of the coating roller, thereby determining the preset opening time of the valve; scraping off part of the first coating layer with a coating scraper and recovering it, so that a second coating layer is formed on the surface of the coating roller; controlling the conveying mechanism to convey the battery cells through the coating roller and the light curing device in sequence. machine, after the second coating layer contacts the battery cell, a battery cell with a third coating layer on the surface is obtained, and the third coating layer is transformed from a semi-solid state to a solid state by the light curing machine; the length of the third coating layer formed on the battery cell is a preset coating length, and the circumference of the coating roller is compared with the preset coating length to obtain a predetermined ratio, and the integer in the predetermined ratio is a preset coating quantity; the time required from forming the first coating layer to forming the third coating layer of the preset coating quantity is obtained, thereby determining the preset closing time of the valve, and the preset opening time and the preset closing time of the valve are operated alternately.

[0019] As a further improvement of the above technical solution: a silk screen is provided on the outer surface of the coating roller, the first coating layer has a first preset thickness range, when the thickness of the first coating layer is within the first preset thickness range, the first coating layer is formed on the silk screen, and the thickness of the first coating layer formed during the preset opening time is within the first preset thickness range.

[0020] As a further improvement of the above technical solution: the battery cells with a preset coating quantity are grouped together, the conveying mechanism conveys multiple groups of battery cells at intervals, the interval duration is equal to the preset opening duration, and multiple battery cells in the same group are conveyed continuously.

[0021] As a further improvement of the above technical solution: a gear pump is provided on the feed pipe to control the feed amount and flow rate of the paint; when the speed of the gear pump changes, the real-time flow rate of the paint is obtained, and the preset opening time is adjusted according to the flow rate.

[0022] Thus, the coating mechanism provided by the present application provides a coating channel connecting the interior and surface of the coating roller, so that the coating can be directly transported to the interior of the coating roller through the coating supply assembly, and then flow to the surface of the coating roller, forming a first coating layer on the surface of the coating roller. The coating scraper is used to change the thickness of the first coating layer to form a second coating layer. When the coating roller contacts the surface of the battery cell, the second coating layer can be applied to the surface of the battery cell. In this way, the time the coating is in contact with the air can be reduced during the process of coating the battery cell surface, thereby reducing the volatilization of the coating and increasing the service life of the coating.

[0023] The present application also provides a coating device, which sets a pre-treatment mechanism so that the surface of the battery cell can reach the state for coating, and sets a post-treatment mechanism so that the third layer of coating can reach the state for subsequent processes, thereby effectively improving the processing effect of the battery cell.

[0024] The present application also provides a coating method, which uses roller coating to apply the coating to the surface of the battery cell, and can control the flow direction of the coating by opening and closing the valve. In this way, the coating roller is alternately in two states: forming a first coating layer and applying a second coating layer to the surface of the battery cell to form a third coating layer, thereby achieving coating of large quantities of battery cells.

[0025] The coating device and the coating method include all technical solutions of the coating mechanism, and therefore also have all technical advantages of the coating mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. 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 these drawings without any creative work.

[0027] Figure 1 Schematic diagram of the planar structure of the coating mechanism provided in an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the planar structure of the coating mechanism provided in an embodiment of the present application when coating a battery cell;

[0029] Figure 3 This is a schematic diagram of the planar structure of the coating scraper and the coating recovery assembly provided in an embodiment of the present application, wherein the coating scraper is arranged at an angle and the recovery pipe is connected to the feed barrel;

[0030] Figure 4 This is a schematic plan view of the structure of a coating recovery assembly when the coating blade provided in an embodiment of the present application is tilted, wherein the recovery pipe is connected to the storage barrel;

[0031] Figure 5 This is a schematic plan view of the structure of the coating recovery assembly when the coating blade provided in an embodiment of the present application is horizontally arranged, wherein the recovery pipe is connected to the feed barrel;

[0032] Figure 6 The embodiment of this application provides Figure 5 A schematic cross-sectional view of a coating blade is shown;

[0033] Figure 7 This is a schematic plan view of the structure of the coating recovery assembly when the coating blade provided in an embodiment of the present application is horizontally arranged, wherein the recovery pipe is connected to the storage barrel;

[0034] Figure 8 This is a coating flow diagram of a coating mechanism provided in an embodiment of the present application;

[0035] Figure 9 This is a coating flow diagram of a coating mechanism provided in an embodiment of the present application, wherein a feed pipe is connected to a feed box, and the coating in the feed box falls onto a coating roller;

[0036] Figure 10 This is a coating flow diagram of the coating mechanism provided in an embodiment of the present application, wherein the feed pipe is connected to the feed box, and the coating in the feed box flows to the coating roller through the paint brush;

[0037] Figure 11 Schematic diagram of the planar structure of the coating roller provided in an embodiment of the present application, wherein a screen is provided on the surface of the coating roller;

[0038] Figure 12 Schematic diagram of the planar structure of the coating roller provided in an embodiment of the present application, wherein a mesh structure is provided inside the coating roller;

[0039] Figure 13 Schematic diagram of the planar structure of the coating device provided in an embodiment of the present application;

[0040] Figure 14 This is a schematic diagram of a planar structure in which a material delivery pipeline and a frame are connected via bearings according to an embodiment of the present application;

[0041] Figure 15 Schematic diagram of the planar structure of the pretreatment mechanism provided in an embodiment of the present application, wherein the pretreatment mechanism only includes a purge component;

[0042] Figure 16 Schematic diagram of the planar structure of the pretreatment mechanism provided in an embodiment of the present application, wherein the pretreatment mechanism includes a spraying component and a drying component arranged in sequence;

[0043] Figure 17Schematic diagram of the planar structure of the pretreatment mechanism provided in an embodiment of the present application, wherein the pretreatment mechanism includes a purge component, a spray component, and a drying component arranged in sequence;

[0044] Figure 18 Schematic diagram of the planar structure of the pretreatment mechanism provided in an embodiment of the present application, wherein the pretreatment mechanism includes a spraying component, a drying component, and a purge component arranged in sequence;

[0045] Figure 19 Schematic diagram of the planar structure of the post-processing mechanism provided in an embodiment of the present application, wherein the post-processing mechanism includes a hot air blower and a nozzle;

[0046] Figure 20 It is a planar structural schematic diagram of the post-processing mechanism provided in an embodiment of the present application, wherein the post-processing mechanism includes a heating lamp tube.

[0047] Reference numerals:

[0048] 10- coating mechanism; 101- coating roller; 1011- feeding chamber; 1012- feeding channel; 102- coating supply assembly; 1021- feeding barrel; 1022- feeding pipe; 103- coating scraper; 1031- recovery hole; 1032- recovery part; 1033- vacuum pump; 104- coating recovery assembly; 1041- recovery pipe; 1042- storage barrel; 105- driving assembly; 1051- bearing; 1052- first gear; 1053- second gear; 1054- driving motor; 1055- feeding pipe; 1056- quick connector; 106- return pipe; 107- first coating layer; 108- second coating layer; 109- feeding box; 110- coating brush; 111- screen; 112- mesh structure;

[0049] 20-cell; 201-third coating layer;

[0050] 30- pretreatment mechanism; 301- purge assembly; 302- spray assembly; 303- drying assembly;

[0051] 40- post-processing mechanism; 401- hot air blower; 402- nozzle; 403- heating lamp;

[0052] 50- conveying mechanism;

[0053] 60-rack;

[0054] 70-Detection board. DETAILED DESCRIPTION

[0055] To make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings. Terms such as "upper", "above", "lower", "below", "first end", "second end", "one end", "the other end" used in this application to express spatial relative positions are used to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings for the purpose of convenience of explanation. Terms of spatial relative position may be intended to include different orientations of the device in use or work other than the orientation shown in the figures. For example, if the device in the figure is turned over, the unit described as being "below" or "beneath" other units or features will be "above" the other units or features. Therefore, the exemplary term "below" can encompass both the above and below orientations. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially related descriptive terms used herein are interpreted accordingly.

[0056] Furthermore, the terms "installed," "disposed," "provided with," "connected," "slidingly connected," "fixed," and "socketed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0057] As pointed out in the background of this application, existing coating processes typically use screen printing to apply coating to the surface of a cell. Specifically, this process involves at least a screen and a scraper. The cell is placed on a workbench with the surface to be processed facing the screen. The coating is delivered to the edge of the screen manually or through automated equipment. The scraper then transfers the coating to the mesh, and the scraper is pushed to cause the coating on the mesh to flow through the mesh and onto the surface to be processed of the cell. However, under this method, the coating is exposed to air for a long time, causing the moisture in the coating to continue to evaporate, which can easily lead to accelerated solidification of the coating, shortening its service life and increasing manufacturing costs.

[0058] Based on this, the present application provides a coating mechanism, a coating device including the coating mechanism, and a method for using the coating device. The coating mechanism provides a coating channel connecting the interior and surface of the coating roller, allowing the coating to be directly transported to the interior of the coating roller through the coating supply assembly, and then flow to the surface of the coating roller, forming a first coating layer on the surface of the coating roller. The coating scraper is used to change the thickness of the first coating layer to form a second coating layer. When the coating roller contacts the surface of the battery cell, the second coating layer can be applied to the surface of the battery cell. In this way, the time the coating is in contact with the air can be reduced during the process of coating the battery cell surface, thereby reducing the volatilization of the coating and improving the coating life.

[0059] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described in this application are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of this application.

[0060] See attached Figure 1-2 As shown, the coating mechanism 10 provided in the embodiment of the present application includes a coating roller 101, a coating supply assembly 102, a coating scraper 103, a coating recovery assembly 104, and a drive assembly 105. The coating roller 101 has a coating passageway that connects the interior and surface of the coating roller 101; the coating supply assembly 102 is used to supply coating to the coating passageway so that the coating flows from the interior of the coating roller 101 to the surface of the coating roller 101 and forms a first coating layer 107; the coating scraper 103 is used to ensure that the thickness of the first coating layer 107 is within a preset range; the coating recovery assembly 104 is connected to the coating scraper 103 and is used to collect and recover the coating on the coating scraper 103; the drive assembly 105 is connected to the coating roller 101 to drive the coating roller 101 to rotate and pass through the coating scraper 103 and the battery cell 20 in sequence. Specifically, the coating scraper 103 is located on one side of the coating roller 101, and there is a certain distance between the coating scraper 103 and the coating roller 101, and the distance is smaller than the thickness of the first coating layer 107, so that after the coating scraper 103 contacts the first coating layer 107, a second coating layer 108 with a thickness smaller than the first coating layer 107 can be formed on the surface of the coating roller 101. The coating mechanism 10 has at least three working states. In the first working state, the surface of the coating roller 101 is covered with paint to form a first coating layer 107; in the second working state, the coating scraper 103 contacts the first coating layer 107 and forms a second coating layer 108; in the third working state, the coating roller 101 contacts the surface of the battery cell 20, so that the second coating layer 108 is detached from the coating roller 101 and coated on the surface of the battery cell 20, and the part of the surface of the coating roller 101 covered by the second coating layer 108 is exposed. Through the supply of the paint supply component 102, the paint will cover this part again and re-form the first coating layer 107. After the second coating layer 108 is coated on the surface of the battery cell 20, a third coating layer 201 will be formed on the surface of the battery cell 20.

[0061] It can be seen from the above embodiment that the third coating layer 201 coated on the surface of the battery cell 20 is formed by the second coating layer 108, that is, the thickness of the third coating layer 201 will be less than or equal to the second coating layer 108. Therefore, in actual application, the distance between the coating scraper 103 and the coating roller 101, that is, the thickness of the second coating layer 108 can be set accordingly as needed.

[0062] In one possible implementation, see the attached Figure 8 As shown, the paint supply assembly 102 includes at least a feed barrel 1021 and a feed pipe 1022. The paint passage includes a feed chamber 1011 and a plurality of feed channels 1012 arranged in the coating roller 101. Both ends of the feed pipe 1022 are connected to the feed chamber 1011 and the feed barrel 1021 respectively. Both ends of each feed channel 1012 are connected to the surface of the coating roller 101 and the feed chamber 1011 respectively. Specifically, the paint in the feed barrel 1021 enters the feed chamber 1011 through the feed pipe 1022. During the rotation of the coating roller 101, the paint in the feed chamber 1011 will flow to the feed channel 1012 under the action of centrifugal force, or enter the feed channel 1012 when the amount of paint in the feed chamber 1011 is too much, and flow to the surface of the coating roller 101 through the feed channel 1012. The paint used in the production process of the solar cell 20 has a certain viscosity, so that the paint flowing to the surface of the coating roller 101 will not directly leave the coating roller 101, but will adhere to the surface of the coating roller 101 to form a first paint layer 107.

[0063] Different from the above-mentioned method in which the coating material flows from the inside of the coating roller 101 to the outside surface to form the first coating layer 107, in another achievable embodiment, the coating material can be directly supplied to the surface of the coating roller 101 by the coating material supply assembly 102. Figure 9 As shown, the other end of the feeding pipe 1022 connected to the feeding barrel 1021 is communicated with the interior of the feeding box body 109. A feeding opening is provided at the bottom of the feeding box body 109, and both the feeding box body 109 and the feeding opening are located above the coating roller 101. The paint can enter the interior of the feeding box body 109 through the feeding channel 1022. Under the action of gravity, the paint flows to the surface of the coating roller 101 through the feeding opening and forms a first coating layer on the coating roller 101. The method of using the feeding box body 109 for feeding can also effectively prevent the paint from coming into contact with air during the process of flowing to the surface of the coating roller 101, thereby preventing the paint from volatilizing. Further, see the attached Figure 10As shown, a paint brush 110 is provided on the feeding opening, one end of the paint brush 110 is connected to the interior of the feeding box body 109, and the other end is located above the coating roller 101, or in contact with the surface of the coating roller 101. In this way, after the paint enters the interior of the feeding box body 109, it will flow to the end of the paint brush 110 connected to the interior of the feeding box body 109. Under the action of gravity, the paint located at one end of the paint brush 110 will flow to the other end of the paint brush 110. When the paint brush 110 is located above the coating roller 101, this method can guide the flow direction of the paint. When the paint brush 110 is in contact with the coating roller 101, the paint can be directly brushed to the surface of the coating roller 101 through the paint brush 110, thereby further improving the uniformity of the paint coating. Compared with the paint falling to the surface of the coating roller 101, brushing can also improve the stability of the paint coating, that is, the paint can be coated on the surface of the coating roller 101.

[0064] In one practicable embodiment, the coating roller 101 is provided with multiple feed channel groups spaced apart along its length, each feed channel group including multiple feed channels 1012, and the multiple feed channels 1012 in the same group are equidistantly arranged along the circumference of the coating roller 101. In other words, the multiple feed channels 1012 are evenly arranged in the coating roller 101, so that the coating material in the feed chamber 1011 can be evenly distributed on the surface of the coating roller 101 through the feed channels 1012. After the coating blade 103 contacts the first coating layer 107, the coating material on the coating roller 101 is redistributed under the thrust exerted by the coating blade 103, thereby further improving the uniformity of the second coating layer 108.

[0065] Furthermore, the widths of the plurality of feeding channels 1012 arranged along the length of the coating roller 101 gradually increase from close to the feeding pipe 1022 to away from the feeding pipe 1022 . Specifically, after the paint enters the feed chamber 1011 through the feed channel 1022, it will move in the direction away from the feed pipe 1022 under the push of the continuously entering paint. Since the paint will flow towards the feed channel 1022 it passes through during the movement, in order to improve the uniformity of the paint on the surface of the coating roller 101, the width of the feed channel 1022 through which the paint first flows is reduced, that is, the amount of paint flowing out through the feed channel 1022 is reduced, and the outflow pressure is increased at the same time, so that when the paint flows from one end to the other end of the feed chamber 1011, the amount of paint flowing out through multiple feed channels 1022 can be within the preset paint amount range, thereby avoiding uneven thickness of the first paint layer 107 formed on the surface of the coating roller 101. By improving the thickness uniformity of the first paint layer 107, it can be ensured that the second paint layer 108 formed after the coating scraper 103 contacts it has a certain uniformity.

[0066] In one feasible embodiment, the coating mechanism further includes several elastic plugs. These plugs are installed manually or automatically into the feed channel 1012 to change the direction of the coating flow and the range of the first coating layer 107, thereby affecting the range of the third coating layer 201 formed on the cell surface. In other words, if the size of the cell changes or the range of the cell to be coated changes, the coating range can be changed by adjusting the discharge range of the feed channel 1012, thereby improving the practicality of the coating mechanism.

[0067] In practical applications, see Appendix Figure 10 As shown, a screen 111 is provided on the coating roller 101, and the screen 111 wraps the outer surface of the coating roller 101, and the first coating layer 107 is formed on the surface of the screen 111. Specifically, after the coating flows to the surface of the coating roller 101 through the feeding channel 1012, it adheres to the surface due to its viscosity. In order to avoid the coating having insufficient viscosity and being unable to adhere to the surface of the coating roller 101, and directly falling after flowing to the surface of the coating roller 101, it is difficult to form the first coating layer 107, a screen 111 can be added to support the coating, so that the coating is prevented from directly falling under the support of the screen 111, and the first coating layer 107 can be formed on the surface of the screen 111. Under this structure, the second coating layer 108 is also formed on the surface of the screen 111. The battery cell contacts the screen 111 or directly contacts the second coating layer 108, so that the coating can adhere to the surface of the battery cell to form the third coating layer 201.

[0068] In one possible implementation, see the attached Figure 11 As shown, a mesh structure 112 is provided inside the coating roller 101. The mesh structure 112 is arranged along the inner wall of the feeding chamber 1011 so that the coating flows through the feeding chamber 1011, the mesh structure 112, and the feeding channel 1012 in sequence. Due to the production method, the use environment, and other reasons, bubbles may appear in the coating. These bubbles will cause the adhesion between the first coating layer 107, the second coating layer 108 and the coating roller 101, and between the third coating layer 201 and the battery cell 20 to decrease, reducing the durability and stability of the coating layer. In addition, the bubbles will also affect the surface quality of the coating layer, making the coating layer uneven and affecting its aesthetics. By providing the mesh structure 112 inside the coating roller 101, the bubbles in the coating can come into contact with the mesh structure 112 when the coating flows through it and be squeezed and broken by it, thereby improving the quality of the coating and the coating effect. During the use of the paint, bubbles may be generated due to volatilization. Under the condition of avoiding the contact between the paint and the air and reducing the chance of volatilization, the structure of the coating mechanism 10 can further improve the quality of the paint.

[0069] In one possible implementation, see the attached Figure 3-Figure 7As shown, the paint recovery assembly 104 includes at least a recovery pipe 1041, one end of which is connected to the surface of the coating scraper 103, and the other end is connected to the supply barrel 1021 or the storage barrel 1042. Specifically, when the coating scraper 103 contacts the first coating layer 107, since the distance between the coating scraper 103 and the coating roller 101 is less than the thickness of the first coating layer 107, a part of the coating scraper 103 contacts the first coating layer 107. During the rotation of the coating roller 101, the coating scraper 103 can separate the part of the first coating layer 107 that is in contact with it from the part that is not in contact with it. The paint remaining on the coating roller 101 forms the second coating layer 108. The paint on the coating scraper 103 is excess paint. The excess paint can be gradually moved into the recovery pipe 1041 by increasing the amount of paint, and finally enters the storage barrel 1042 or the supply barrel 1021 for storage. If the paint collected by the coating scraper 103 is determined to be of qualified quality by manual or equipment inspection and can be used directly, the recovery pipe 1041 can be directly connected to the storage barrel 1042. If the paint collected by the coating scraper 103 cannot be directly used for a second time, the recovery pipe 1041 can be connected to the storage barrel 1042, and then the paint in the storage barrel 1042 can be processed so that its quality can meet the usage standards.

[0070] Furthermore, the feed barrel 1021 and the storage barrel 1042 are connected by a storage pipe, which is equipped with a filter. If the paint collected by the coating scraper 103 can be filtered to meet the requirements of secondary use, a filter can be added to the storage pipe to filter the paint flowing through it, and the filtered paint will enter the feed barrel 1021. The filter and the storage pipe are detachably connected. In this way, after long-term use, the filter can be removed for cleaning or replacement to ensure that the filter on the storage pipe continues to filter.

[0071] Furthermore, a pump body can be added to the material storage pipeline to provide power to the paint in the material storage pipeline, so that the paint in the material storage barrel 1042 can be transported to the supply barrel 1021 through the material storage pipeline.

[0072] In this embodiment, the coating blade 103 is arranged at an angle or horizontally. Figure 3-4As shown, when the coating scraper 103 is tilted, the coating scraper 103 has a certain tilt angle relative to the horizontal plane, and the end of the coating scraper 103 that contacts the first coating layer 107 is the highest point of the tilt position. The end of the coating scraper 103 away from the first coating layer 107 is funnel-shaped, and the width gradually decreases. The end with the smallest width is connected to the recovery pipe 1041. Under this structure, the paint on the coating scraper 103 can slide to the lowest point under the action of gravity and enter the recovery pipe 1041. Since the width of the end of the coating scraper 103 away from the first coating layer 107 gradually decreases, the paint on the coating scraper 103 can be gathered and its sliding direction can be guided so that the paint can accurately enter the recovery pipe 1041, thereby realizing the recovery of excess paint. When the coating scraper 103 is set horizontally, see the attached Figure 5-7 As shown, the coating scraper 103 is parallel to the horizontal plane, and a recovery piece 1032 is provided under the coating scraper 103. The recovery piece 1032 is funnel-shaped, and its width gradually decreases. The end with the smallest width is connected to the recovery pipe 1041. A plurality of recovery holes 1031 are provided on the coating scraper 103, and the plurality of recovery holes 1031 can all be covered by the end with the largest width of the recovery piece 1032; under this structure, as the amount of paint on the coating scraper 103 increases, the newly scraped paint will push the paint already on the coating scraper 103 to move away from the first paint layer 107. During the movement, the paint will pass through the recovery hole 1031, fall into the recovery hole 1031, and flow to the recovery pipe 1041, thereby realizing the recovery of excess paint.

[0073] Furthermore, a vacuum pump 1033 is provided on the recovery pipe 1041. When in operation, the vacuum pump 1033 generates negative pressure, sucking the paint from the surface of the coating blade 103. This reduces the amount of paint remaining on the surface of the coating blade 103, preventing the paint from solidifying on the surface of the coating blade 103 after being left there for a long time, thereby affecting the subsequent use of the coating blade 103, and reducing paint waste.

[0074] Furthermore, limit plates can be provided on both sides of the coating scraper 103. By providing the limit plates, the coating on the coating scraper 103 is guided to move, and the coating can be prevented from falling off the edge of the coating scraper 103 and failing to accurately enter the recovery pipe 1041.

[0075] Conventional coating uses screen printing, which leaves paint residue on the scraper and screen that come into contact with the paint. The higher the viscosity of the paint, the greater the amount of residual paint. This can cause the paint remaining on the scraper and screen to clump after a long time, clogging the mesh and affecting the coating effect. Furthermore, large amounts of residual paint waste the paint, increasing the production cost of the solar cell 20. In this embodiment, the coating roller 101 continuously applies the paint on its surface to the surface of the solar cell 20, and the paint on the coating blade 103 is recovered by the paint recovery assembly 104. As a result, no paint residue remains on either the coating roller 101 or the coating blade 103 to affect the coating effect, and paint waste is effectively avoided.

[0076] In order to further improve the utilization rate of the paint, the paint recovery component 104 can also include any one or a combination of two or more components selected from the group consisting of a small vibrator, a paint blowing component, and a scraper cleaning component. The small vibrator can be installed on the coating scraper 103 to generate vibration to make the coating scraper 103 enter the recovery hole 1031 or move in a specific direction, thereby avoiding paint residue; the paint blowing component can use the combination of a compressed air machine and an air duct to blow the air flow to the surface of the coating scraper 103, so that the paint moves in a specific direction; the scraper cleaning component can use the combination of cleaning liquid and a cleaning nozzle to flush the surface of the coating scraper 103 with the cleaning liquid to remove the paint remaining on the surface of the coating scraper 103. It should be noted that the paint recovered in this way needs to be further processed before it can be recycled.

[0077] In one possible implementation, see the attached Figure 8 As shown, one end of the feed chamber 1011 is connected to the feed chamber 1011, and the other end is connected to the return pipe 106, and the return pipe 106 is connected to the feed barrel 1021. When the feed pipe 1022 continuously transports paint into the feed chamber 1011, there may be an excessive amount of paint in the feed chamber 1011, or when the coating roller 101 rotates and generates centrifugal force, the paint enters the feed pipe 1022. In order to prevent the paint on the surface of the coating roller 101 from being too much and unable to remain attached to the surface of the coating roller 101 and falling directly, the return pipe 106 can recover the paint in the feed chamber 1011 that exceeds its capacity or flows into the return pipe 106. Specifically, after the paint enters the feed chamber 1011 through the feed pipe 1022, it will move along the length of the feed pipe 1022 under the push of the continuously entering paint, and enter the feeding channel 1012 or the return pipe 106 along the way.

[0078] In a feasible embodiment, the return pipe 106 is provided with at least one selected from the group consisting of a valve, a pump body and a flow meter; the supply pipe 1022 is provided with at least one selected from the group consisting of a valve, a pump body and a flow meter.

[0079] Among them, valves are provided on the return pipe 106 and the supply pipe 1022 to control the flow direction of the paint in the return pipe 106 and the supply pipe 1022, and to prevent the paint in the supply chamber 1011 from continuously flowing out of the supply channel 1012 and merging with the second paint layer 108 after the coating scraper 103 contacts the first paint layer 107, causing the second paint layer 108 to form on the surface of the coating roller 101, resulting in a change in the thickness of the second paint layer 108. In addition, when the valves on the supply pipe 1022 and the return pipe 106 are both opened, the supply barrel 1021, the supply pipe 1022, the supply chamber 1011 and the return pipe 106 together form a paint loop, which can realize the recycling of excess paint. By providing pump bodies on both the return pipe 106 and the supply pipe 1022, power is provided to the paint flow in the return pipe 106 and the supply pipe 1022, so that the paint can flow along the paint loop. The flow meters installed on the return pipe 106 and the supply pipe 1022 are used to monitor the amount of paint flowing through the return pipe 106 and the supply pipe 1022 in real time, so as to adjust the valves on the return pipe 106 and the supply pipe 1022, thereby controlling the amount of paint in the supply chamber 1011.

[0080] Of course, the coating mechanism 10 can also include a controller, and there are communication lines (wired or wireless communication lines) between the valves, pump bodies and flow meters and the controller. The controller can receive signals sent by the valves, pump bodies and flow meters, and then monitor the real-time flow of the paint in the return pipe 106 and the supply pipe 1022 (if a non-communication line connection method is adopted, manual monitoring can be used), and regulate the flow direction of the paint in the return pipe 106 and the supply pipe 1022 (if a non-communication line connection method is adopted, manual regulation can be used).

[0081] In actual applications, a preset range of coating flow rates in the return pipe 106 and the supply pipe 1022 can be determined through experimentation. When the coating flow rate is within this preset range, the coating flowing through the supply channel 1012 onto the surface of the coating roller 101 will not fall directly from the coating roller 101 due to excessive flow, and the thickness of the formed first coating layer 107 will be greater than the desired thickness of the second coating layer 108. When the coating flow rate in the return pipe 106 and the supply pipe 1022 falls outside the preset range, the flow meter can provide feedback to the controller via the aforementioned communication line. The controller then issues an alert in the form of sound and light, and controls the valve to close and the pump to reduce its opening. The time required for the coating roller 101 to coat the surface of a battery cell 20 and the time interval between the contact between two adjacent battery cells 20 and the coating roller 101 can also be obtained. In this way, when the surface of the battery cell 20 contacts the coating roller 101, the controller can reduce the amount of coating flowing out through the feed channel 1012 by closing the valve of the feed pipe 1022, thereby avoiding the continuous increase in the thickness of the second coating layer 108 during the contact between the coating roller 101 and the battery cell 20.

[0082] Preferably, the pump body arranged on the feed pipe 1022 adopts a gear pump, and the rotational speed of the gear pump is in a linear relationship with the feed amount, and the feed amount can be changed by adjusting the rotational speed of the gear pump, thereby realizing accurate control of the feed amount and the feed speed. Further, the gear pump is connected to the servo motor, and the servo motor drives the gear pump to rotate, thereby accurately controlling the rotational speed and torque of the gear pump 20, which is conducive to improving the working performance and stability of the gear pump. In addition, the servo motor can reach the set speed in a short time and quickly adapt to the change of the load, which helps to improve the dynamic characteristics and response speed of the gear pump, and has higher reliability and stability. It should be noted that other types of power sources can also be used to drive the gear pump to rotate, as long as the requirements of driving the gear pump can be met, and no specific restrictions are made here.

[0083] Among them, the gear pump is configured to promote the flow of paint, increase pressure and adjust flow in this embodiment so that the paint in the feeding pipe 1022 can be accurately delivered to the feeding chamber 1011. The gear pump is any one of an external gear pump and an internal gear pump, which can be selected according to actual needs and is not specifically limited here. Paint usually has a certain viscosity, and the gear pump needs to have good sealing performance and stability to prevent leakage and pressure fluctuations. The internal gear pump has a simple structure and good sealing performance, which can meet the demand for paint discharge. In addition, the flow of the internal gear pump is stable and the pressure fluctuation is small, which is also conducive to the stable output of the paint. In this example, an internal gear pump is preferably used.

[0084] In one possible implementation, see the attached Figure 1As shown, both ends of the coating roller 101 are provided with a feeding pipe 1055 connected to the feeding chamber 1011, and the ends of the two feeding pipes 1055 away from the coating roller 101 are respectively connected to the return pipe 106 and the feeding pipe 1022 through a quick connector 1056; a first gear 1052 is provided on the feeding pipe 1055, and the driving assembly 105 includes at least a driving motor 1054 and a second gear 1053, and the output shaft of the driving motor 1054 is connected to the second gear 1053, and the first gear 1052 is meshed with the second gear 1053. Specifically, when the drive motor 1054 drives the second gear 1053 to rotate, it can drive the first gear 1052 meshing with it to rotate, thereby causing the material delivery pipe 1055 and the coating roller 101 to rotate in the same direction. Since the return pipe 106 and the supply pipe 1022 are both connected to the material delivery pipe 1055 via the quick connector 1056, the quick connector 1056 can achieve the connection and communication between the two components, and at least one component can rotate relative to the quick connector 1056. In this way, when the material delivery pipe 1055 rotates, the return pipe 106 and the supply pipe 1022 can both remain stationary, thereby ensuring the stability of the feeding and returning of materials.

[0085] Furthermore, the quick connector 1056 has a sealing ring to prevent the paint from leaking during the transportation process.

[0086] An embodiment disclosed in the present application further provides a coating device, which includes the coating mechanism 10 in the aforementioned embodiment.

[0087] In this embodiment, reference Figure 13 As shown, the coating device includes a pre-treatment mechanism 30, a coating mechanism 10, a post-treatment mechanism 40, and a conveying mechanism 50. The pre-treatment mechanism 30 is used to pre-treat the surface of the battery cell 20 so that the surface of the battery cell 20 is ready for coating; the coating mechanism 10 is used to form a third coating layer 201 on the surface of the battery cell 20; the post-treatment mechanism 40 is used to post-treat the coating layer so that the third coating layer is ready for subsequent processes; and the conveying mechanism 50 is used to convey the battery cell 20 along a conveying path so that the battery cell 20 can move through the pre-treatment mechanism 30, the coating mechanism 10, and the post-treatment mechanism 40.

[0088] In this embodiment, the conveying mechanism 50 adopts a roller conveyor. Of course, other conveyors with other structures that can achieve the purpose of conveying the battery cells 20 can also be adopted, and this application does not impose any restrictions on this.

[0089] In practical applications, see Appendix Figure 13-14As shown, the coating device also has a frame 60, and the pre-treatment mechanism 30, coating mechanism 10, post-treatment mechanism 40, and conveying mechanism 50 are all arranged on the frame 60 to improve the stability of the coating device. The coating mechanism 10 has a bearing 1051 installed on the material conveying pipe 1055, and the outer walls of the outer rings of the two bearings 1051 are both mounted on the frame 60, and the inner walls are connected to the material conveying pipe 1055. The coating blade 103 is detachably connected to the frame 60, and the coating blade 103 and the coating roller 101 are arranged in sequence along the conveying path and evenly positioned above the conveying mechanism 50. In this way, the coating roller 101 can coat the upper surface of the battery cell 20.

[0090] Furthermore, the coating device also includes a flip mechanism, which has two flip assemblies. The two flip assemblies are arranged opposite to each other and are respectively located on both sides of the conveying mechanism 50. The flip assembly includes a flip motor, a horizontal flip cylinder, a vertical flip cylinder and a mounting seat. The output shaft of the flip motor is connected to the mounting seat. The vertical flip cylinder is arranged on the mounting seat and the piston rod is connected to the horizontal flip cylinder. The piston rod of the horizontal flip cylinder is connected to the clamping plate. The horizontal flip cylinder and / or the vertical flip cylinder are provided with an in-position sensor to determine whether the battery cell 20 has moved into position. When the battery cell 20 moves into position, the horizontally arranged flip cylinder drives the clamping plate to approach and clamp the battery cell 20, and the vertical flip cylinder drives the horizontal flip cylinder to drive the battery cell 20 to move upward away from the conveying mechanism 50, so that the flip motor drives the mounting seat to drive the battery cell 20 to rotate. Under this structure, the pretreatment mechanism 30, the coating mechanism 10 and the post-treatment mechanism 40 are each provided with two to achieve double-sided coating of the battery cell 20. It should be noted that the coating of the non-electroplating surface of the battery cell 20 only needs to be performed on one side, so as to protect the structure of the non-electroplating surface of the battery cell 20 .

[0091] In order to avoid the third coating layer 201 having inconsistent thickness on the surfaces of the plurality of battery cells 20 after coating, or the thickness not meeting the set subsequent process processing standard, in an achievable embodiment, see the attached Figure 13As shown, the coating device also includes a detection plate 70, which is arranged on the frame 60 and is located above the conveying mechanism 50. The detection plate 70 is located between the coating mechanism 10 and the post-processing mechanism 40, so that after the third coating layer 201 reaches a height that meets the processing standards, the post-processing mechanism 40 will process it to prevent the battery cell 20 from being unable to undergo subsequent processing. Preferably, an in-place sensor is also provided at the end of the detection plate 70 away from the coating mechanism 10 to detect whether the third coating layer 201 reaches a preset thickness after moving through the detection plate 70. The in-place sensor is electrically connected to the controller so that the controller can obtain the detection result when the third coating layer 201 does not meet the standards. Specifically, the detection plate 70 is arranged horizontally, and the distance between the lower surface of the detection plate 70 and the upper surface of the conveying mechanism 50 is equal to the thickness of the battery cell 20 plus the preset thickness of the third coating layer 201. In this way, after the third coating layer 201 is formed on the surface of the battery cell 20, it moves through the detection plate 70. If the thickness of the third coating layer 201 is greater than the preset thickness, the end of the detection plate 70 will separate the third coating layer 201 into two parts after contacting the third coating layer 201. The part that meets the preset thickness will still be coated on the surface of the battery cell 20, and the part higher than the preset thickness will be separated; if the third coating layer 201 is less than the preset thickness, the controller will receive the detection information sent by the in-place sensor and issue a reminder in the form of sound, light and electricity.

[0092] In a feasible embodiment, the pre-processing mechanism 30 may adopt any one of the following structures or a combination of two or more structures:

[0093] (1) comprising a purge assembly 301, the purge assembly 301 comprising a nozzle and a gas compressor, the nozzle and the gas compressor being connected via a purge pipe, the nozzle of the nozzle facing the conveying mechanism 50 to purge the surface of the battery cell 20;

[0094] (2) It includes a spray component 302 and a drying component 303 arranged in sequence. The spray component 302 includes a cleaning tank and a spray head. The spray head is connected to the cleaning tank through a spray pipe. The nozzle of the spray head is directed toward the conveying mechanism 50 to clean the surface of the battery cell 20. The first drying component 303 includes a heating element. The heating element is located above and / or below the conveying mechanism 50 to dry the surface of the battery cell 20.

[0095] When only the purge assembly 301 is provided, see the attached Figure 15 As shown, the gas is blown toward the surface of the battery cell 20 through the nozzle, thereby blowing off the impurities on the surface of the battery cell 20, so that the surface of the battery cell 20 can be cleaned to improve the cleanliness and perform subsequent coating; when only the spray component 302 and the drying component 303 are provided, see the attached Figure 16As shown, the cleaning liquid in the cleaning tank is sprayed onto the surface of the battery cell 20 through the spray head to flush the impurities on the surface of the battery cell 20, so that the surface of the battery cell 20 can be cleaned to improve the cleanliness for subsequent coating; when the purge component 301, the spray component 302 and the drying component 303 are set at the same time, see the attached Figure 17 As shown, on the conveying path, the purge component 301 can be arranged before the spray component 302 and the drying component 303, that is, the surface of the battery cell 20 is first purged, and then sprayed and dried. Figure 18 As shown, it can also be arranged after the spraying component 302 and the drying component 303, that is, the surface of the battery cell 20 is sprayed and dried first, and then purged. The purging component 301 can also be arranged between the spraying component 302 and the drying component 303, that is, the surface of the battery cell 20 is sprayed first, and then purged and dried in sequence. The above three arrangements can further improve the cleanliness of the surface of the battery cell 20, thereby improving the processing quality of the battery cell 20. Among them, the heating element can be a hot air blower 401 or a heating lamp 403, so that the temperature of the surface of the battery cell 20 is increased and the residual cleaning liquid can evaporate to avoid affecting the subsequent coating.

[0096] In one possible implementation, see the attached Figure 19 As shown, the post-processing mechanism 40 includes a heat curing machine or a light curing machine. The heat curing machine is a hot air blower 401 and a nozzle 402. The nozzle 402 is connected to the hot air blower 401 through a hot air duct. The nozzle 402 is provided with a plurality of nozzle holes facing the conveying mechanism 50 to dry the third coating layer 201. Alternatively, see the attached Figure 20 As shown, the heat curing machine is a heating lamp 403, which is located above and / or below the conveying mechanism 50 to dry the third coating layer 201. The light curing machine includes an ultraviolet light source or a visible light source, which uses ultraviolet light or visible light of a specific wavelength to irradiate the third coating layer 201, thereby evaporating the moisture in the third coating layer 201 and solidifying it on the surface of the battery cell 20.

[0097] In one embodiment disclosed in the present application, a coating method is further provided, which is applied to the coating device in the aforementioned embodiment, comprising:

[0098] A valve is provided on the feed pipe 1022 connected to the paint passage to control the flow direction of the paint;

[0099] Obtaining the time required from the time the valve is opened to the time the paint passes through the paint passage and forms the first paint layer 107 on the surface of the coating roller 101, thereby determining the preset opening time of the valve;

[0100] The coating scraper 103 scrapes off part of the first coating layer 107 and recycles it, so that a second coating layer 108 is formed on the surface of the coating roller 101;

[0101] The conveying mechanism 50 is controlled to convey the cell 20 through the coating roller 101 and the light curing machine in sequence. After the second coating layer 108 contacts the cell 20, the cell 20 having the third coating layer 201 on the surface is obtained. The third coating layer 201 is transformed from a semi-solid state to a solid state by the light curing machine.

[0102] The length of the third coating layer 201 formed on the battery cell 20 is a preset coating length. The circumference of the coating roller 101 is compared with the preset coating length to obtain a predetermined ratio, and the integer in the predetermined ratio is a preset coating quantity.

[0103] The time required from forming the first coating layer 107 to forming the third coating layer 201 of the preset coating quantity is obtained to determine the preset closing time of the valve, and the preset opening time and the preset closing time of the valve are operated alternately.

[0104] Compared with the screen printing coating method in the prior art, this method coats the battery cell 20 by roller coating. Since the paint is transported to the paint passage of the coating roller 101, the time the paint is in contact with the air is reduced during the process of forming the first paint layer 107 on the surface of the coating roller 101, thereby avoiding the reduction of the paint life due to volatilization.

[0105] In addition, the method uses a valve to control the flow direction of the paint, and sets a preset opening time and a preset closing time of the valve. When the valve is in the preset opening time, the paint flows to the surface of the coating roller 101 through the feeding pipe 1022 and the paint passage, and forms a first paint layer 107 on the surface of the coating roller 101. After the first paint layer 107 contacts the coating scraper 103, a second paint layer 108 is formed. In order to avoid the coating roller 101 from being unable to carry more paint due to continued feeding and causing the paint to fall off, and to prevent the thickness of the second paint layer 108 from changing due to continued feeding after the second paint layer 108 is formed, After the first coating layer 107 is formed, the valve will be closed, that is, switched from the preset opening time to the preset closing time, so that the first coating layer 107 formed on the surface of the coating roller 101 can be completely converted into the second coating layer 108, and the second coating layer 108 is coated on the surface of the battery cell 20 at a certain thickness to form a third coating layer 201. After the first coating layer 107 formed by the coating roller 101 in a preset opening time is coated, the valve can be opened, that is, switched from the preset closing time to the preset opening time, so that the first coating layer 107 can be formed on the surface of the coating roller 101 again.

[0106] In one practicable embodiment, a screen 111 is provided on the outer surface of the coating roller 101. The first coating layer 107 has a first predetermined thickness range. When the thickness of the first coating layer 107 is within the first predetermined thickness range, the first coating layer 107 is formed on the screen 111, and the thickness of the first coating layer formed during the predetermined on-time is within the first predetermined thickness range. To ensure that the surfaces of the second coating layer 108 and the third coating layer 201 have a certain degree of flatness, the thickness of the first coating layer must be within the first predetermined thickness range so that the first coating layer 107 can contact the coating blade 103, thereby forming a smooth second coating layer 108. In addition, in this embodiment, a wire mesh 111 is added to support the paint, thereby improving the integrity of the first paint layer 107. That is, when the valve is in the preset opening time, the paint will flow out through the feed channel 1012 and will flow to the surface of the wire mesh 111, and form the first paint layer 107 on the surface of the wire mesh 111, and the first paint layer 107 is within the first preset thickness range, thereby improving the adhesion integrity of the first paint layer 107 and the flatness of the second paint layer 108 and the third paint layer 201.

[0107] In a feasible embodiment, a preset number of battery cells 20 to be coated are grouped together, and the conveying mechanism 50 conveys multiple groups of battery cells 20 at intervals, with the interval duration being equal to the preset opening duration, and multiple battery cells 20 in the same group are conveyed continuously. Specifically, when the valve is in a preset closing time, the first coating layer 107 formed on the coating roller 101 will all become the second coating layer 108, and the second coating layer 108 will be coated on the surface of a preset number of battery cells 20. After the preset number of battery cells 20 are coated, the second coating layer 108 on the coating roller 101 will be completely consumed, or a residual part (the circumference of the coating roller 101 is compared with the preset coating length to obtain a predetermined ratio, and the remainder in the predetermined ratio is the residual part). At this time, the valve will be opened again, and the coating after entering the feeding channel 1012 will form a first coating layer 107 with a thickness within the first preset thickness range on the coating roller 101, or be mixed with the residual part to form a first coating layer 107 exceeding the first preset thickness range. Since the amount of coating in the residual part is small, a second coating layer 108 meeting the preset thickness can still be formed under the scraping of the coating scraper 103.

[0108] Since the preset coating quantity is an integer in a predetermined ratio of the circumference of the coating roller 101 to the preset coating length, multiple battery cells 20 in the same group are continuously conveyed to achieve continuous coating of the coating roller 101, thereby achieving the maximum number of battery cells 20 that can be coated when the valve is opened once. If multiple battery cells 20 in the same group are conveyed at intervals, the interval distance will cause part of the first coating layer 107 to be wasted, resulting in a reduction in the number of coated battery cells 20 and a reduction in production efficiency.

[0109] In one feasible embodiment, a gear pump is provided on the feed pipe 1012 to control the feed amount and flow rate of the coating material; when the speed of the gear pump changes, the real-time flow rate of the coating material is obtained, and the preset opening time is adjusted according to the flow rate. When the flow rate of the coating material entering the feed chamber 1011 changes, the speed at which the coating material flows to the surface of the coating roller 101 will change accordingly. In other words, the speed at which the coating material reaches the first preset thickness range will change. Since the valve can be closed and enters the preset closing time after the thickness of the first coating layer 107 reaches the first preset thickness range, the change in the valve closing time will result in a change in the preset opening time. However, the circumference of the coating roller 101 and the preset coating length will not change due to the change in the coating material flow rate, that is, the preset closing time of the valve will not change.

[0110] Thus, the coating mechanism 10 provided in the present application, by providing a coating channel connecting the interior and surface of the coating roller 101, allows the coating to be directly transported to the interior of the coating roller 101 through the coating supply assembly 102, and then flows to the surface of the coating roller 101, forming a first coating layer 107 on the surface of the coating roller 101. The coating scraper 103 is used to change the thickness of the first coating layer 107 to form a second coating layer 108. When the coating roller 101 contacts the surface of the battery cell 20, the second coating layer 108 can be applied to the surface of the battery cell 20. In this way, the time the coating is in contact with the air can be reduced during the process of coating the surface of the battery cell 20, thereby reducing the volatilization of the coating and improving the life of the coating.

[0111] The present application also provides a coating device including a coating mechanism 10, which provides a pre-treatment mechanism 30 so that the surface of the battery cell 20 can reach a coating state, and provides a post-treatment mechanism 40 so that the third layer of coating can reach a state for subsequent processes, thereby effectively improving the processing effect of the battery cell 20.

[0112] The present application also provides a coating method, which uses roller coating to apply the coating to the surface of the battery cell, and can control the flow direction of the coating by opening and closing the valve. In this way, the coating roller is alternately in two states: forming a first coating layer and applying a second coating layer to the surface of the battery cell to form a third coating layer, thereby achieving coating of large quantities of battery cells.

[0113] It needs to be defined that the "vertical" or "parallel" mentioned in this application is not strictly vertical or parallel. For example, an angle of 92 degrees or 88 degrees between two components can be considered vertical, and an angle of 2 degrees between two components can be considered parallel. That is, within the scope of manufacturing tolerance or on the premise of meeting functional requirements, the two components remain "vertical" or "parallel".

[0114] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A coating mechanism, characterized in that: include: a coating roller having a coating passage communicating with the interior and surface of the coating roller; a coating supply assembly for supplying coating to the coating passage, so that the coating flows from the interior of the coating roller to the surface of the coating roller and forms a first coating layer; a coating scraper, used to ensure that the thickness of the first coating layer is within a preset range; A paint recovery component, used for collecting the paint on the coating blade and recycling it; A drive assembly connected to the coating roller to drive the coating roller to rotate and pass through the coating blade and the battery cell in sequence, so that after the coating blade contacts the first coating layer, a second coating layer is formed on the surface of the coating roller, and the thickness of the second coating layer is less than that of the first coating layer; In the working state, the surface of the battery cell contacts the coating roller, so that the second coating layer is separated from the coating roller and coated on the surface of the battery cell, forming a third coating layer on the surface of the battery cell.

2. The coating mechanism according to claim 1, characterized in that: The paint supply assembly at least includes a supply barrel and a supply pipe; The paint passage includes a feed chamber and multiple feed channels arranged in the coating roller. Both ends of the feed pipe are connected to the feed chamber and the feed barrel respectively, and both ends of each feed channel are connected to the coating roller surface and the feed chamber respectively.

3. The coating mechanism according to claim 2, characterized in that: The coating roller is provided with a plurality of feed channel groups at intervals along its length, each of the feed channel groups includes a plurality of the feed channels, and the plurality of feed channels in the same group are equidistantly arranged along the circumference of the coating roller.

4. The coating mechanism according to claim 1, characterized in that: The coating roller is provided with a screen, the screen wraps the outer surface of the coating roller, and the first coating layer is formed on the surface of the screen.

5. The coating mechanism according to claim 2, characterized in that: A mesh structure is provided in the coating roller, and the mesh structure is provided along the inner wall of the feeding chamber, so that the coating material flows through the feeding chamber, the mesh structure and the feeding channel in sequence.

6. The coating mechanism according to any one of claims 1 or 2, characterized in that: The paint recovery component at least includes a recovery pipe, one end of which is connected to the surface of the coating scraper, and the other end of which is connected to the supply barrel or the storage barrel.

7. The coating mechanism according to claim 6, characterized in that: The coating scraper is arranged obliquely or horizontally; When the coating scraper is tilted, the end of the coating scraper in contact with the first coating layer is the highest point of the tilt, and the end of the coating scraper away from the first coating layer is funnel-shaped, with a width gradually decreasing, and the end with the smallest width is connected to the recovery pipe; When the coating scraper is set horizontally, a recovery piece is set below the coating scraper. The recovery piece is funnel-shaped and its width gradually decreases. The end with the smallest width is connected to the recovery pipe. A plurality of recovery holes are opened on the coating scraper, and the plurality of recovery holes can all be covered by the end with the largest width of the recovery piece.

8. The coating mechanism according to claim 2, characterized in that: The coating mechanism may also adopt any one of the following structures or a combination of two or more structures: (1) The paint recovery assembly includes at least a recovery pipe, one end of which is connected to the surface of the coating scraper, and the other end is connected to the feed barrel or storage barrel, and a vacuum pump is provided on the recovery pipe; (2) The coating mechanism further includes a material storage barrel, the material supply barrel and the material storage barrel are connected via a material storage pipe, and a filter is provided on the material storage pipe; (3) One end of the feed chamber is connected to the feed pipe, and the other end is connected to the return pipe, and the return pipe is connected to the feed barrel; the return pipe is provided with at least one selected from the group consisting of a valve, a pump body and a flow meter; the feed pipe is provided with at least one selected from the group consisting of a valve, a pump body and a flow meter.

9. The coating mechanism according to claim 8, characterized in that: Both ends of the coating roller are provided with a feeding pipe connected to the feeding chamber, and the ends of the two feeding pipes away from the coating roller are connected to the return pipe and the feeding pipe respectively through quick connectors; A first gear is provided on the material conveying pipeline, and the driving assembly includes at least a driving motor and a second gear. The output shaft of the driving motor is connected to the second gear, and the first gear is meshed with the second gear.

10. A coating mechanism, characterized in that: include: A coating roller, wherein a feeding chamber and a plurality of feeding channels are provided in the coating roller, and both ends of each feeding channel are respectively connected to the surface of the coating roller and the feeding chamber; The paint supply assembly comprises at least a supply barrel and a supply pipe, wherein both ends of the supply pipe are connected to the supply barrel and the supply chamber respectively; A coating scraper is located on one side of the coating roller, with a certain distance between the coating scraper and the coating roller; A coating recovery assembly, comprising at least a recovery pipe, wherein the recovery pipe is in communication with the surface of the coating blade; a driving assembly connected to the coating roller and driving the coating roller to rotate; The coating mechanism has at least three working states. In the first working state, the surface of the coating roller is covered with coating to form a first coating layer. In the second working state, the coating scraper contacts the first coating layer and forms a second coating layer, and the thickness of the second coating layer is less than that of the first coating layer. In the third working state, the coating roller contacts the surface of the battery cell, and the portion of the coating roller surface covered by the second coating layer is exposed.

11. A coating device, characterized in that: include: A pretreatment mechanism, used for pretreatment of the cell surface; A coating mechanism, used for forming a third coating layer on the surface of the battery cell; A post-processing mechanism, for post-processing the coating layer; A conveying mechanism, used to convey the battery sheet so that it passes through the pre-treatment mechanism, the coating mechanism and the post-treatment mechanism in sequence; Among them, the coating mechanism includes at least a coating roller, a coating supply assembly, a coating scraper, a coating recovery assembly and a drive assembly, the coating supply assembly is used to supply coating to the coating roller so that a first coating layer is formed on the surface of the coating roller; the coating scraper is used to make the thickness of the first coating layer within a preset range; the coating recovery assembly is connected to the coating scraper, and is used to collect the coating on the coating scraper and recover it; the drive assembly is connected to the coating roller to drive the coating roller to rotate and pass through the coating supply assembly and the coating scraper in sequence, and contact the surface of the battery cell.

12. The coating device according to claim 11, characterized in that The pretreatment mechanism may adopt any one of the following structures or a combination of two or more structures: (1) comprising a purge assembly, the purge assembly comprising a nozzle and a gas compressor, the nozzle and the gas compressor being connected via a purge pipe, the nozzle of the nozzle facing the conveying mechanism to purge the surface of the battery cell; (2) It includes a spray component and a drying component arranged in sequence, the spray component includes a cleaning tank and a spray head, the spray head is connected to the cleaning tank through a spray pipe, the nozzle of the spray head is directed toward the conveying mechanism to clean the surface of the battery cell, and the first drying component includes a heating element, which is located above and / or below the conveying mechanism to dry the surface of the battery cell.

13. The coating device according to claim 11, characterized in that The post-processing mechanism includes a heat curing machine or a light curing machine, the heat curing machine includes a hot air blower and a nozzle, the nozzle is connected to the hot air blower through a hot air duct, and the nozzle is provided with a plurality of spray holes facing the conveying mechanism to dry the third coating layer; Alternatively, the heat curing machine is a heating lamp tube, and the heating lamp tube is located above and / or below the conveying mechanism to dry the third coating layer.

14. The coating device according to claim 11, characterized in that The coating device also includes a detection plate, which is located above the conveying mechanism and has a certain distance between it and the conveying mechanism. The distance is the sum of the third preset thickness of the battery cell and the third coating layer. The coating mechanism, the detection plate and the post-processing mechanism are arranged in sequence along the conveying direction of the conveying mechanism.

15. A coating device, characterized in that: The coating mechanism according to any one of claims 1 to 11 further comprises: A pretreatment mechanism, including a purge component, or a spray component and a drying component, or a purge component, a spray component and a drying component; Post-processing mechanism, including heat curing machine or light curing machine; The conveying mechanism, the pre-processing mechanism, the coating mechanism and the post-processing mechanism are sequentially arranged on a conveying path of the conveying mechanism.

16. A coating method, characterized in that: Providing a coating roller having a coating passage, wherein the coating passage communicates with the interior and the surface of the coating roller; A valve is provided on the material supply pipe connected to the paint passage to control the flow direction of the paint; Obtaining the time required from the time the valve is opened to the time the paint passes through the paint passage and forms a first paint layer on the surface of the coating roller, thereby determining a preset opening time of the valve; scraping off and recovering part of the first coating layer with a coating scraper, so that a second coating layer is formed on the surface of the coating roller; Controlling the conveying mechanism to convey the battery cell through the coating roller and the light curing machine in sequence, so that the second coating layer contacts the battery cell, thereby obtaining a battery cell having a third coating layer on the surface, and the third coating layer is transformed from a semi-solid state to a solid state by the light curing machine; The length of the third coating layer formed on the battery cell is a preset coating length, and the circumference of the coating roller is compared with the preset coating length to obtain a predetermined ratio, and the integer in the predetermined ratio is a preset coating quantity; The time required from forming the first coating layer to forming the third coating layer of the preset coating quantity is obtained to determine the preset closing time of the valve, and the preset opening time and the preset closing time of the valve are operated alternately.

17. The coating device according to claim 16, characterized in that A silk screen is provided on the outer surface of the coating roller, and the first coating layer has a first preset thickness range. When the thickness of the first coating layer is within the first preset thickness range, the first coating layer is formed on the silk screen, and the thickness of the first coating layer formed within the preset opening time is within the first preset thickness range.

18. The coating device according to claim 16, characterized in that The preset number of battery cells to be coated is a group, and the conveying mechanism conveys multiple groups of battery cells at intervals, with the interval length being equal to the preset opening time length, and multiple battery cells in the same group are conveyed continuously.

19. The coating device according to claim 16, characterized in that The feed pipe is provided with a gear pump to control the feed amount and flow rate of the coating; When the rotation speed of the gear pump changes, the real-time flow rate of the paint is obtained, and the preset opening time is adjusted according to the flow rate.

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