Film coating device and film coating method

Abstract

The present application provides a film coating device and a film coating method. The film coating device comprises: a feeding mechanism, used for conveying battery cells in the process of coating the battery cells, the feeding mechanism comprising a conveying platform used for placing and conveying the battery cells to move towards the film coating position; a pushing mechanism, used for pushing the battery cells to move towards the film coating position relative to the conveying platform; and a film stretching and coating mechanism, arranged on the tail end side of the moving direction of the conveying platform and used for carrying out film stretching and coating on the battery cells.

Description

Coating device and coating method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410056392.7, filed on January 15, 2024, entitled “Encapsulation Device and Encapsulation Method,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery production and manufacturing, and in particular to a coating device and a coating method. Background Art

[0004] With the rapid development of the lithium-ion battery industry, applying blue film to battery cell surfaces is a crucial method for insulating the cell surface. The process of pushing the battery cell material at the front of the film wrapping station is a crucial factor affecting the quality and cycle time of the film wrapping. Furthermore, the action of the adhesive puller plays a crucial role in the speed of the entire film wrapping process and the quality of the blue adhesive after the film is pulled.

[0005] Currently, the front and rear wrapping stations of film wrapping machines are typically fixed across the industry. Limited by the movement space of the central adhesive puller, the distance between the front and rear wrapping stations is often quite large, making it easy for cells to fall off when wrapping smaller cells. Furthermore, due to the distance between the front and rear wrapping stations, the cells are prone to shaking during the transition from the front to the rear wrapping station, thus affecting the wrapping effect. Furthermore, after wrapping one battery, the adhesive puller must perform complex movements before the next battery can be started, affecting the overall wrapping cycle.

[0006] Therefore, there is an urgent need to develop a safe and efficient coating device to ensure production safety while improving production efficiency and enhancing product competitiveness.

[0007] Summary of the Invention

[0008] In view of the above problems, the present application provides a coating device and a coating method, which can solve the core falling problem and improve the coating effect. It can also simplify the glue pulling action of the glue pulling rod and improve the overall rhythm of the coating mechanism.

[0009] In a first aspect, the present application provides a coating device, wherein the coating device includes: a feeding mechanism for conveying the battery cell during the coating process, the feeding mechanism including: a conveying table for carrying and conveying the battery cell to a coating position; and a pushing mechanism for pushing the battery cell to move relative to the conveying table to a coating position; and a glue pulling and coating mechanism, which is arranged at the end side of the moving direction of the conveying table and is used to perform glue pulling and coating on the battery cell.

[0010] With this arrangement, when wrapping smaller cells, the push rod pushes the cell toward the cell wrapping position relative to the conveyor platform to the front wrapping position. Even if the distance between the front and rear wrapping positions is large, the conveyor platform can be moved toward the rear wrapping position as the pull rod descends, allowing the cell placed on the conveyor platform to move further toward the rear wrapping position, thereby shortening the distance between the front and rear wrapping positions. This prevents the cell from falling during transport between the front and rear wrapping positions.

[0011] In some embodiments, the feeding mechanism includes a conveyor rail for guiding the movement of the conveyor.

[0012] In some embodiments, the feeding mechanism includes a conveying table driver for driving the conveying table to move.

[0013] In some embodiments, a workpiece placement portion extending along a moving direction of the conveying platform is provided on an upper surface of the conveying platform for placing the battery cell.

[0014] In some embodiments, the feeding mechanism includes a pair of guide members, which are respectively arranged on both sides of the workpiece loading portion on the upper surface of the conveying table. The spacing between the pair of guide members can be adjusted, and the battery cell is guided by abutting against the battery cell.

[0015] In some embodiments, the feeding mechanism includes a position detection mechanism, and the position detection mechanism is used to detect the position of the battery cell on the workpiece mounting portion.

[0016] In some embodiments, the feeding mechanism includes a pushing mechanism driver for driving the pushing mechanism to move.

[0017] In some embodiments, the glue pulling and coating mechanism includes: a glue pulling rod for pulling glue; and an upper pressure roller and a lower pressure roller for coating the battery cell. The lower pressure roller is located above the upper pressure roller, and an opening is formed between the lower pressure roller and the upper pressure roller for the battery cell to pass through.

[0018] In some embodiments, the initial position of the lower pressing roller is closer to the initial position of the battery cell in the moving direction of the conveying platform than that of the upper pressing roller.

[0019] By positioning the initial position of the lower pressure roller closer to the initial position of the battery cell in the direction of conveyor movement than the upper pressure roller, this reduces the time required for the pull rod to retract and extend, compared to conventional coating devices where the lower and upper pressure rollers are equidistant from the battery cell in the direction of cell conveyance. This improves the overall coating cycle and makes the entire coating process more efficient.

[0020] In some embodiments, the initial position of the lower pressing roller is located at a position capable of abutting against the glue pulling rod in the direction in which the conveying platform moves.

[0021] By arranging the initial position of the lower pressure roller so that it can contact the rubber pulling rod in the direction of the conveyor platform's movement, the rubber pulling rod's retraction and extension actions can be saved, thereby further improving the overall film wrapping cycle and making the overall film wrapping action more efficient.

[0022] In some embodiments, the glue-pulling and film-wrapping mechanism includes a pressing mechanism that is disposed on the initial position side of the battery cell of the glue-pulling rod and presses the battery cell conveyed by the feeding mechanism.

[0023] In some embodiments, the glue-pulling and film-wrapping mechanism includes a glue-pulling rod slide rail for guiding the sliding of the glue-pulling rod.

[0024] In some embodiments, the rubber-drawing and film-wrapping mechanism includes an upper pressure roller driver for driving the upper pressure roller and a lower pressure roller driver for driving the lower pressure roller.

[0025] In some embodiments, an upper pressing roller connecting portion is provided between the upper pressing roller and the upper pressing roller driver, and a lower pressing roller connecting portion is provided between the lower pressing roller and the lower pressing roller driver.

[0026] In some embodiments, the rubber-drawing and film-wrapping mechanism includes a pressure roller connecting portion guide rail for guiding the movement of the upper pressure roller connecting portion and the lower pressure roller connecting portion.

[0027] In some embodiments, the adhesive film drawing mechanism includes an adhesive rod driver for driving the adhesive rod.

[0028] In some embodiments, the glue-drawing and film-wrapping mechanism includes a pair of cutters for cutting the film, and the pair of cutters are arranged between the lower pressure roller and the upper pressure roller in the up and down directions, and are arranged on both sides of the opening in a direction orthogonal to the up and down directions and the direction of transport of the battery cells.

[0029] In some embodiments, the pair of cutters are respectively disposed in cutter covers.

[0030] In some embodiments, the glue-pulling and film-wrapping mechanism includes a detection portion for detecting whether the battery cell passes through an area between the pair of cutters.

[0031] In some embodiments, the detection portion is a photoelectric sensor, and the photoelectric sensor is disposed on a side opposite to the opening in a direction in which the pair of cutters are arranged.

[0032] In a second aspect, the present application provides a coating method for coating battery cells, wherein the coating method includes the following processes: a pre-coating process, in which a pushing mechanism pushes the battery cell to move toward a coating position relative to a conveyor platform carrying the battery cell, and uses a glue pulling rod to adhere the film to be coated and pull the glue downward to the coating position; a main coating process, in which when the pushing mechanism pushes the battery cell to the front coating position of the glue pulling coating mechanism, the conveyor platform starts to move toward the rear coating position of the glue pulling coating mechanism until the upper end face of the battery cell abuts against the lower pressure roller located at the initial position, and the front end of the lower end face of the battery cell abuts against the upper pressure roller, thereby using the lower pressure roller and the upper pressure roller to coat the front end face and the upper and lower large surfaces of the battery cell; and a retraction process, in which after the main coating process is completed, the conveyor platform and the pushing mechanism are simultaneously retracted toward the front coating position, so that the glue pulling rod abuts against the lower pressure roller located at the initial position.

[0033] When wrapping smaller cells, even if the distance between the front and rear wrapping stations is large, the conveyor platform can be moved toward the rear wrapping station as the pull rod descends. This allows the cells placed on the conveyor platform to move further toward the rear wrapping station, thereby shortening the distance between the front and rear wrapping stations. This prevents cells from falling during transport between the front and rear wrapping stations.

[0034] In some embodiments, in the main wrapping process, when the pushing mechanism pushes the battery cell to the front wrapping position of the glue-pulling wrapping mechanism, the pressing mechanism located at the front wrapping position presses the battery cell. When the pressing mechanism presses the battery cell, the conveying platform moves toward the rear wrapping position.

[0035] In some embodiments, during the retraction process, the rubber pulling rod is only moved vertically upward until it abuts against the lower pressure roller located at the initial position.

[0036] Since the rubber pulling rod can abut against the lower pressing roller at the initial position by simply moving the rubber pulling rod vertically upward, the rubber pulling rod retraction and extension actions can be saved, thereby further improving the overall film wrapping rhythm and making the overall film wrapping action more efficient.

[0037] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the drawings without inventive effort. In addition, it should be noted that the drawings are not drawn according to the actual scale.

[0039] FIG1 is an overall front view of a coating device disclosed in one embodiment of the present application;

[0040] FIG2 is a top view of the front film wrapping position of the rubber-drawing film wrapping mechanism included in the film wrapping device disclosed in one embodiment of the present application;

[0041] FIG3 is a perspective view showing a portion of the coating device of FIG1 located on the left side of the rubber pulling rod;

[0042] FIG4 is a rear view of a coating device disclosed in an embodiment of the present application;

[0043] FIG5 is a schematic diagram showing the positional relationship between the glue pulling rod and the lower pressing roller in the film coating device disclosed in one embodiment of the present application.

[0044] Description of reference numerals:

[0045] Coating device 1000;

[0046] Feeding mechanism 100, glue drawing and film wrapping mechanism 200, film (blue film) 300;

[0047] Conveyor table 101, conveyor table guide rail 102, conveyor table driver (conveyor table drive cylinder) 103, pushing mechanism (push rod) 104, workpiece loading section (loading rail) 105, guide member 106, position detection mechanism 107;

[0048] Glue pulling rod 201, upper pressure roller 202, lower pressure roller 203, opening part 204, clamping mechanism 205, glue pulling rod slide rail 206, upper pressure roller driver 207, lower pressure roller driver 208, upper pressure roller connecting part (upper pressure roller connecting plate) 209, lower pressure roller connecting part (lower pressure roller connecting plate) 210, pressure roller connecting part guide rail 211, glue pulling rod driver 212, cutter cover 213, detection part (photoelectric sensor) 214; light 215. DETAILED DESCRIPTION

[0049] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "include", "including" and "have" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0051] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0052] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0054] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0055] In the description of the embodiments of the present application, the technical 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., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do 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 embodiments of the present application.

[0056] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0057] At present, with the rapid development of the lithium battery industry, the production efficiency requirements for power batteries are getting higher and higher, the production safety requirements for lithium batteries are getting higher and higher, and the production costs need to be significantly reduced.

[0058] The inventors have noted that applying blue film to the surface of battery cells is an important method for insulating the cell surface. The process of pushing the cell material at the front filming position is a relatively important factor affecting the filming quality and cycle time. Furthermore, the glue pulling action of the glue pulling rod also plays a crucial role in the speed of the entire filming process and the quality of the blue glue after the glue is pulled.

[0059] Currently, the front and rear film wrapping stations of film wrapping machines are typically fixed throughout the industry. Limited by the movement space of the central film-pulling rod, the distance between the front and rear film-pulling stations is often far apart, making it easy for cells to fall off when wrapping smaller cells. Furthermore, the film-pulling operation for lithium batteries is a bottleneck within the film-wrapping equipment. Its complex operation significantly impacts machine cycle time, requiring significant investment to purchase equipment that meets this cycle time requirement.

[0060] To solve the problem of battery cells falling during the coating process, the inventors discovered that the conveyor platform used to transport the battery cells can be set to be movable. Specifically, when the glue pulling rod is lowered, the conveyor platform can move further forward, shortening the distance between the front and rear coating positions. In addition, to improve the overall coating rhythm, the position of the lower pressure roller in the direction of battery cell transportation can be changed. Specifically, the initial position of the lower pressure roller is closer to the initial position of the battery cell in the direction of movement of the conveyor platform than the upper pressure roller.

[0061] Based on the above considerations, in order to solve the above problems, a coating device was designed. By enabling the conveying platform for conveying the battery cells to be movable and making the initial position of the lower pressure roller closer to the initial position of the battery cells compared with the upper pressure roller, the battery cells can be prevented from shaking or even falling during the coating process, and the overall coating rhythm is improved.

[0062] The coating device disclosed in the embodiments of this application can be used, but is not limited to, for coating power batteries for automobiles, ships, aircraft, and the like, and can also be applied to other workpieces that require coating. By using the feed mechanism and coating device disclosed in this application, it is possible to prevent battery cells from shaking or even falling when passing through the transition zone between the front and rear coating positions, and to simplify the coating action of the coating rod, thereby improving the overall cycle time of the coating mechanism.

[0063] For the convenience of description, the following embodiments are described by taking a film coating device 1000 according to an embodiment of the present application as an example.

[0064] The coating device 1000 of the present application is a device for transporting and coating battery cells. As shown in FIG1 , in this embodiment, the coating device 1000 includes a feeding mechanism 100 and a glue-pulling and coating mechanism 200 .

[0065] The feeding mechanism 100 is used to transport the battery cells during the process of coating the battery cells. The feeding mechanism 100 includes: a conveying table 101, which is used to load and transport the battery cells (not shown) as the coating objects to the coating position; and a push rod 104 as a pushing mechanism, which is used to push the battery cells relative to the conveying table 101 to the coating position.

[0066] The adhesive-extracting and film-extracting mechanism 200 is disposed at the end side of the conveying platform 101 in the moving direction, and is used for applying adhesive-extracting and film-extracting to the battery cells.

[0067] In this embodiment, the conveyor platform 101 can move forward or backward relative to the cell wrapping position. This arrangement allows smaller cells to be wrapped, and when the push rod 104 pushes the cell toward the cell wrapping position relative to the conveyor platform 101 to the front wrapping position, even if the distance between the front and rear wrapping positions is large, the conveyor platform 101 can be moved toward the rear wrapping position as the pull rod 201 descends. This allows the cell carried by the conveyor platform 101 to be moved further toward the rear wrapping position (to the right in the figure), thereby shortening the distance between the front and rear wrapping positions. This prevents the cell from falling during transport between the front and rear wrapping positions.

[0068] Here, the so-called front and back wrapping positions refer to the two workstations of the glue-pulling and wrapping mechanism 200 for wrapping the battery cells. The so-called front and back are relative to the glue-pulling rod 201. In the process of transporting the battery cells for wrapping, in the direction of the battery cells moving from the initial position to the final wrapping completion position, the wrapping position that has not reached the glue-pulling rod 201, that is, the wrapping position on the initial position side of the battery cells of the glue-pulling rod 201 is called the front wrapping position, and the wrapping position after passing the glue-pulling rod 201, that is, the wrapping position on the opposite side of the initial position side of the battery cells of the glue-pulling rod 201 is called the rear wrapping position. For ease of understanding, the portion of the glue-pulling and wrapping mechanism 200 located on the left side of the glue-pulling rod 201 in Figure 1 is called the front wrapping position, and the portion of the glue-pulling and wrapping mechanism 200 located on the right side of the glue-pulling rod 201 is called the rear wrapping position.

[0069] In addition, the initial position of the battery cell refers to the position where the battery cell is placed on the conveyor table 101 and the conveyor table 101 has not started to move and has not started to be pushed by the push rod 104 .

[0070] According to some embodiments of the present application, the feeding mechanism 100 includes a conveying platform guide rail 102 for guiding the movement of the conveying platform 101 .

[0071] Since the feeding mechanism 100 includes the conveying platform guide rail 102 , the conveying platform 101 can be guided to move more efficiently and smoothly.

[0072] According to some embodiments of the present application, the feeding mechanism 100 includes a conveyor table driver 103 for driving the conveyor table 101 to move. In FIG1 , a cylinder is used as the conveyor table driver, which is sometimes also referred to as the conveyor table driving cylinder 103 hereinafter.

[0073] The feeding mechanism 100 includes a conveyor table driving cylinder 103 disposed on the left side of the conveyor table 101, which enables bidirectional movement of the conveyor table 101. That is, by extending the cylinder rod, the conveyor table 101 moves to the right in Figure 1, and conversely, by retracting the cylinder rod, the conveyor table 101 moves to the left in Figure 1. In this way, bidirectional movement of the conveyor table 101 and the battery cells, such as forward and backward movement, can be achieved with a simple structure.

[0074] According to some embodiments of the present application, a workpiece loading portion 105 extending along the moving direction of the conveyor 100 is provided on the upper surface of the conveyor 101 for loading battery cells. In FIG2 , the workpiece loading portion 105 is a pair of loading rails for loading battery cells.

[0075] By providing a pair of loading rails, the push rod 104 can be used to push the battery cell to move between the pair of loading rails. Of course, the workpiece loading portion 105 is not limited to a pair of rails. As long as it is convenient for the push rod 104 to push the battery cell to move on the workpiece loading portion, it can also be any structure such as a groove or a protrusion.

[0076] According to some embodiments of the present application, as shown in FIG2 , the feeding mechanism 100 includes a pair of guide members 106 , which are disposed on either side of a workpiece loading portion (loading rail) 105 on the upper surface of the conveyor table 100 . The spacing between the pair of guide members 106 is adjustable, and the pair of guide members 106 guide the battery cells by contacting the battery cells loaded on the loading rail 105 . In FIG2 , the pair of guide members 106 is a pair of guide roller walls.

[0077] Here, the guide roller wall is a sidewall formed by a set of rotating rollers. As shown in Figure 2, each set of rotating rollers is arranged along the extension direction of the carrier rail 105, and each rotating roller is positioned perpendicular to the upper surface of the conveyor table 100. The rotation of each rotating roller guides the battery cells. In addition, the spacing between the pair of guide roller walls 106 can be adjusted to accommodate battery cells of different widths. Of course, the guide member 106 is not limited to a guide roller wall and can be any structure as long as it can guide the battery cells.

[0078] According to some embodiments of the present application, as shown in FIG. 2 , the feeding mechanism 100 includes a position detection mechanism 107 , which is used to detect the position of the battery cell on the workpiece mounting portion 105 .

[0079] In Figure 2, the position detection mechanism 107 uses a photoelectric sensor, but other position detection mechanisms can also be used. By providing the photoelectric sensor, it is possible to monitor whether the battery cell has left the loading track 105, especially when the battery cell passes through a blind spot.

[0080] According to some embodiments of the present application, the feeding mechanism 100 includes a driving mechanism driver (not shown) for driving the driving mechanism 104. As long as the driving mechanism driver can drive the driving mechanism 104, there is no special requirement for its driving type and location.

[0081] According to some embodiments of the present application, as shown in Figures 1, 3, and 4, the glue pulling and film coating mechanism 200 includes: a glue pulling rod 201 for pulling glue; and an upper pressure roller 202 and a lower pressure roller 203 for coating the battery cell. The lower pressure roller 203 is located above the upper pressure roller 202, and an opening 204 for the battery cell to pass through is formed between the lower pressure roller 203 and the upper pressure roller 202.

[0082] According to some embodiments of the present application, the initial position of the lower pressing roller 203 is closer to the initial position of the battery cell in the moving direction of the conveying platform 101 than that of the upper pressing roller 202 .

[0083] In this embodiment, the upper pressing roller 202 does not translate as a whole, but rotates only around the roller center. In contrast, the lower pressing roller 203 has two positions: an initial position and a front-end contact position. When rolling against the front end of a cell, the lower pressing roller 203 descends from the initial position and rolls against the front end of the cell, after which it returns to the initial position. In other words, the lower pressing roller 203 is always in the initial position except when rolling against the front end of the cell.

[0084] As described above, by positioning the initial position of the lower pressing roller 203 closer to the initial position of the battery cell in the direction of conveyor table 101 relative to the initial position of the upper pressing roller 202, the time required for the retraction and extension of the adhesive rod 201 can be reduced compared to conventional coating devices in which the lower pressing roller 203 and the upper pressing roller 202 are positioned at the same distance from the battery cell in the direction of cell conveyance. This improves the overall coating cycle and makes the entire coating process more efficient.

[0085] According to some embodiments of the present application, the initial position of the lower pressing roller 203 is located at a position capable of abutting against the glue pulling rod 201 in the direction of movement of the conveying platform.

[0086] By making the initial position of the lower pressing roller 203 in the direction of the conveyor moving direction so as to be in contact with the rubber pulling rod 201, the rubber pulling rod 201 can be saved from retracting and extending, thereby further improving the overall film wrapping rhythm and making the overall film wrapping action more efficient.

[0087] According to some embodiments of the present application, the glue-pulling and film-wrapping mechanism 200 includes a pressing mechanism 205 which is arranged on the initial position side of the battery cell of the glue-pulling rod 201 and presses the battery cell delivered by the feeding mechanism 100 .

[0088] By providing a clamping mechanism 205, when a cell reaches the clamping mechanism 205 located at the front wrapping position shown in FIG3 , the clamping mechanism 205 compresses the cell, and the conveyor platform driving cylinder 103 shown in FIG1 extends. With the clamping mechanism 205 pressing the cell, the cell moves forward as a whole, following the front wrapping position. This prevents the cell from bouncing during the wrapping process, which could lead to poor wrapping.

[0089] According to some embodiments of the present application, as shown in FIG3 , the adhesive film drawing and coating mechanism 200 includes an adhesive rod slide rail 206 for guiding the adhesive rod 201 to slide.

[0090] By providing the glue pulling rod slide rail 206 , the glue pulling rod 201 can be moved on the glue pulling rod slide rail 206 .

[0091] According to some embodiments of the present application, as shown in FIG. 4 , the rubber-drawing and film-wrapping mechanism 200 includes an upper pressure roller driver 207 for driving the upper pressure roller 202 and a lower pressure roller driver 208 for driving the lower pressure roller 203 .

[0092] According to some embodiments of the present application, as shown in FIG4 , an upper pressure roller connection portion 209 is provided between the upper pressure roller 202 and the upper pressure roller driver 207 , and a lower pressure roller connection portion 210 is provided between the lower pressure roller 203 and the lower pressure roller driver 208 .

[0093] As shown in FIG4 , in this embodiment, the upper pressure roller driver 207 and the lower pressure roller driver 208 are both servo motors, and the upper pressure roller connecting portion 209 and the lower pressure roller connecting portion 210 are both connecting plates. That is, the upper pressure roller servo motor 207 is connected to the upper pressure roller 202 via the upper pressure roller connecting plate 209 to drive the upper pressure roller 202, and the lower pressure roller servo motor 208 is connected to the lower pressure roller 203 via the lower pressure roller connecting plate 210 to drive the lower pressure roller 203.

[0094] According to some embodiments of the present application, as shown in FIG. 4 , the rubber-drawing and film-wrapping mechanism 200 includes a roller connection guide rail 211 for guiding the movement of the upper roller connection 209 and the lower roller connection 210 .

[0095] According to some embodiments of the present application, as shown in FIG3 , the adhesive film drawing and coating mechanism 200 includes an adhesive rod driver 212 for driving the adhesive rod 201 .

[0096] According to some embodiments of the present application, referring to FIG. 4 , the adhesive-drawing and film-wrapping mechanism 200 includes a pair of cutters (not shown) for cutting the film. The pair of cutters are disposed vertically between the lower pressing roller 203 and the upper pressing roller 202 and are arranged on both sides of the opening 204 in a direction perpendicular to the vertical direction and the direction in which the battery cells are transported. Furthermore, according to some embodiments of the present application, the pair of cutters are respectively disposed in a cutter cover 213 .

[0097] The pair of cutters can cut the film between the lower pressing roller 203 and the upper pressing roller 202 .

[0098] According to some embodiments of the present application, the adhesive-drawing and film-wrapping mechanism 200 includes a detection unit 214 for detecting whether the battery cell passes through the area between the pair of cutters. Furthermore, according to some embodiments of the present application, the detection unit 214 is a photoelectric sensor, which is disposed on the side opposite to the opening 204 in the direction in which the pair of cutters are arranged.

[0099] As shown in FIG4 , a pair of photoelectric sensors 214 are provided to detect the presence of film between the lower pressing roller 203 and the upper pressing roller 202. When the pair of photoelectric sensors 214 detect the presence of film between the lower pressing roller 203 and the upper pressing roller 202, the pair of cutters are driven to cut the film if cutting is required.

[0100] According to some embodiments of the present application, the present application also provides a coating method for coating a battery cell, wherein the coating method includes the following steps: a pre-coating step, in which the pushing mechanism 104 pushes the battery cell to move toward the coating position relative to the conveyor platform 101 carrying the battery cell, and uses the glue pulling rod 201 to adhere the film to be coated and pull the glue downward to the coating position; a main coating step, in which when the pushing mechanism 104 pushes the battery cell to the front coating position of the glue pulling and coating mechanism 200, the conveyor platform starts to move to the rear coating position of the glue pulling and coating mechanism 200. The battery cell moves in the direction of the film position until the upper end face of the battery cell abuts against the lower pressure roller 203 located at the initial position, and the front end of the lower end face of the battery cell abuts against the upper pressure roller 202, thereby utilizing the lower pressure roller 203 and the upper pressure roller 202 to cover the front end face and the upper and lower large faces of the battery cell; and a returning process, after the main film coating process is completed, the conveying platform 101 and the pushing mechanism 104 are simultaneously returned toward the direction of the front film coating position, so that the glue pulling rod 201 abuts against the lower pressure roller 203 located at the initial position.

[0101] Here, the lower pressing roller 203 and the upper pressing roller 202 are used to cover the front end face and the upper and lower large surfaces of the battery cell. Specifically, when the conveyor starts to move toward the rear wrapping position of the glue pulling and wrapping mechanism 200, until the upper end face of the battery cell abuts against the lower pressing roller 203 located at the initial position and the front end of the lower end face of the battery cell abuts against the upper pressing roller 202, the lower pressing roller 203 is used to roll the entire front end face of the battery cell, and then the pushing mechanism 104 continues to push the battery cell forward, and the lower pressing roller 203 and the upper pressing roller 202 are used to complete the covering of the upper and lower large surfaces of the battery cell.

[0102] When wrapping smaller cells, even if the distance between the front and rear wrapping locations is large, by enabling the conveyor platform 101 to move toward the rear wrapping location as the glue pulling rod 201 descends, the cells placed on the conveyor platform 101 can be moved further toward the rear wrapping location (to the right in the figure), thereby shortening the distance between the front and rear wrapping locations. This prevents the cells from falling during transport between the front and rear wrapping locations.

[0103] According to some embodiments of the present application, in the main wrapping process, when the pushing mechanism 104 pushes the battery cell to the front wrapping position of the glue-pulling wrapping mechanism 200, the pressing mechanism 205 located at the front wrapping position presses the battery cell. When the pressing mechanism 205 presses the battery cell, the conveying platform 101 moves toward the rear wrapping position.

[0104] By providing a clamping mechanism 205, when a cell reaches the clamping mechanism 205 located at the front wrapping position shown in FIG3 , the clamping mechanism 205 clamps the cell, and the conveyor platform driving cylinder 103 shown in FIG1 extends, causing the cell to move forward as a whole along with the front wrapping position while the clamping mechanism 205 clamps the cell. This prevents the cell from bouncing during the wrapping process, which could cause wrapping defects.

[0105] According to some embodiments of the present application, in the retracting process, the glue pulling rod is only moved vertically upward until it abuts against the lower pressure roller located at the initial position.

[0106] Since the rubber pulling rod can abut against the lower pressing roller in the initial position by simply moving the rubber pulling rod upward vertically, the retraction and extension of the rubber pulling rod 201 can be saved. As a result, the overall film wrapping rhythm can be further improved, making the overall film wrapping action more efficient.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A film wrapping device, wherein, the film wrapping device includes: a feeding mechanism for conveying the battery cell during the film wrapping process of the battery cell. The feeding mechanism includes: a conveying table for placing and conveying the battery cell to move towards the film wrapping position; and a pushing mechanism for pushing the battery cell relative to the conveying table towards the film wrapping position; and a glue pulling and film wrapping mechanism provided at the end side in the moving direction of the conveying table for performing glue pulling and film wrapping on the battery cell.

2. The film wrapping device according to claim 1, wherein, the feeding mechanism includes a conveying table guide rail for guiding the movement of the conveying table.

3. The film wrapping device according to claim 1 or 2, wherein, the feeding mechanism includes a conveying table driver for driving the movement of the conveying table.

4. The film wrapping device according to any one of claims 1 to 3, wherein, a workpiece placement portion extending in the moving direction of the conveying table is provided on the upper surface of the conveying table for placing the battery cell.

5. The film wrapping device according to claim 4, wherein, the feeding mechanism includes a pair of guide members which are respectively provided on both sides of the workpiece placement portion on the upper surface of the conveying table, and the distance between the pair of guide members can be adjusted to guide the battery cell by abutting against the battery cell.

6. The film wrapping device according to any one of claims 4 or 5, wherein, the feeding mechanism includes a position detection mechanism for detecting the position of the battery cell on the workpiece placement portion.

7. The film wrapping device according to any one of claims 1 to 6, wherein, the feeding mechanism includes a pushing mechanism driver for driving the movement of the pushing mechanism.

8. The film wrapping device according to any one of claims 1 to 7, wherein, the glue pulling and film wrapping mechanism includes: a glue pulling rod for pulling glue; and an upper pressing roller and a lower pressing roller for performing film wrapping on the battery cell. The lower pressing roller is located above the upper pressing roller, and an opening portion for the battery cell to pass through is formed between the lower pressing roller and the upper pressing roller.

9. The film wrapping device according to claim 8, wherein, the initial position of the lower pressing roller is closer to the initial position of the battery cell in the moving direction of the conveying table compared to the upper pressing roller.

10. The film wrapping device according to claim 9, wherein, the initial position of the lower pressing roller is located at a position where it can abut against the glue pulling rod in the moving direction of the conveying table.

11. The film wrapping device according to any one of claims 8 to 10, wherein, the glue pulling and film wrapping mechanism includes a pressing mechanism provided on the initial position side of the battery cell of the glue pulling rod for pressing the battery cell conveyed by the feeding mechanism.

12. The film wrapping device according to any one of claims 8 to 11, wherein, the glue pulling and film wrapping mechanism includes a glue pulling rod slide rail for guiding the sliding of the glue pulling rod.

13. The film wrapping device according to any one of claims 8 to 12, wherein, The glue-pulling film wrapping mechanism includes an upper pressure roller driver for driving the upper pressure roller and a lower pressure roller driver for driving the lower pressure roller.

14. The film wrapping device according to claim 13, wherein, An upper pressure roller connection part is provided between the upper pressure roller and the upper pressure roller driver, and a lower pressure roller connection part is provided between the lower pressure roller and the lower pressure roller driver.

15. The film wrapping device according to claim 14, wherein, The glue-pulling film wrapping mechanism includes a pressure roller connection part guide rail for guiding the movement of the upper pressure roller connection part and the lower pressure roller connection part.

16. The film wrapping device according to any one of claims 8 to 15, wherein, The glue-pulling film wrapping mechanism includes a glue-pulling rod driver for driving the glue-pulling rod.

17. The film wrapping device according to any one of claims 8 to 16, wherein, The glue-pulling film wrapping mechanism includes a pair of cutting knives for cutting the film. The pair of cutting knives are arranged between the lower pressure roller and the upper pressure roller in the up-down direction, and are arranged on both sides of the opening part in a direction orthogonal to the up-down direction and the direction of the battery cell conveyance.

18. The film wrapping device according to any one of claim 17, wherein, The pair of cutting knives are respectively arranged in cutting knife covers.

19. The film wrapping device according to claim 17 or 18, wherein, The glue-pulling film wrapping mechanism includes a detection part for detecting whether the battery cell passes through the area between the pair of cutting knives.

20. The film wrapping device according to any one of claim 19, wherein, The detection part is a photoelectric sensor, and the photoelectric sensor is arranged on the side opposite to the opening part in the direction where the pair of cutting knives are arranged.

21. A film wrapping method for wrapping a battery cell, wherein, This film wrapping method includes the following processes: Pre-film wrapping process: The pushing mechanism pushes the battery cell relative to the conveyance table on which the battery cell is placed to move to the film wrapping position, and uses the glue-pulling rod to adhere to the film to be wrapped and pull the glue downward to the film wrapping position; Main film wrapping process: When the pushing mechanism pushes the battery cell to the front film wrapping position of the glue-pulling film wrapping mechanism, the conveyance table starts to move in the direction of the rear film wrapping position of the glue-pulling film wrapping mechanism until the upper end surface of the battery cell abuts against the lower pressure roller at the initial position, and the front end of the lower end surface of the battery cell abuts against the upper pressure roller, thereby using the lower pressure roller and the upper pressure roller to wrap the front end surface and the upper and lower large surfaces of the battery cell; and Retracting process: After the main film wrapping process is completed, the conveyance table and the pushing mechanism are simultaneously retracted in the direction of the front film wrapping position, so that the glue-pulling rod abuts against the lower pressure roller at the initial position.

22. The film wrapping method according to claim 21, wherein, In the main film wrapping process, when the pushing mechanism pushes the battery cell to the front film wrapping position of the glue-pulling film wrapping mechanism, the pressing mechanism at the front film wrapping position presses the battery cell, and in the state where the pressing mechanism presses the battery cell, the conveyance table moves in the direction of the rear film wrapping position.

23. The film wrapping method according to claim 21 or 22, wherein, In the return process, the rubber pulling rod is only moved vertically upward until it abuts against the pressing roller at the initial position.

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