Device for wrapping battery cell with Mylar film

Abstract

The utility model provides a device for wrapping a Mylar film on a battery cell, which comprises a portal frame, a Z-axis linear module and an X-axis linear module connected with the Z-axis linear module are arranged on the portal frame, a cross arm is arranged on the X-axis linear module, and a first finger cylinder and a second finger cylinder which are oppositely arranged are respectively arranged at two ends of the cross arm. The first finger air cylinder and the second finger air cylinder are jointly used for clamping a Mylar film in a tiled state and turning over the Mylar film by 180 degrees, a film pressing roller is arranged on one side of each finger air cylinder, and the film pressing rollers are used for smoothing warped edges of the Mylar film before the first finger air cylinder and the second finger air cylinder clamp the Mylar film. When the Mylar wrapping device is used for wrapping Mylar, the horizontal height of the Mylar film when the Mylar film is laid is adjusted to be equal to the horizontal height of the gap of the finger cylinder, so that the initial end position of the Mylar film and the clamping gap of the finger cylinder are positioned at the same height, and the Mylar film can be clamped conveniently. And manual adjustment intervention is reduced, so that the automation efficiency of the equipment is improved.

Description

Technical Field

[0001] This utility model generally relates to the field of lithium battery technology. More specifically, this utility model relates to a cell-wrapping Mylar membrane device. Background Technology

[0002] In the lithium-ion battery manufacturing process, the process of applying Mylar film is called Mylar film coating. Mylar film is a polyester film. Mylar film coating is an important step in lithium-ion battery assembly, typically performed after the bare cells have been stacked or wound. The main function of Mylar film coating is to protect and insulate the cells, preventing damage during subsequent processing.

[0003] Existing Mylar film wrapping equipment uses a three-axis module to pull the film onto the battery cell surface. However, the initial position of the Mylar film, i.e., the beginning of the clamped film, often exhibits an upward curl, significantly exceeding the horizontal height of the Mylar film when laid flat. This results in the initial position of the Mylar film not being at the same height as the clamping gap of the finger cylinder, making it impossible to clamp. Furthermore, existing wrapping equipment, by clamping the left and right ends of the Mylar film and covering it onto the battery cell surface, is only suitable for small cells. For longer cells, if only the left and right ends of the Mylar film are clamped, because Mylar film is a flexible polyester film, the middle section of the film, which is flipped onto the battery cell surface, experiences less force, while the left and right sides of the film, which contact the battery cell, experience greater force. This uneven force distribution across the entire film easily causes an arched upward bulge in the middle section, preventing it from adhering flat to the battery cell surface.

[0004] In view of this, there is an urgent need to provide a battery cell packing Mylar membrane device to solve the problem. Utility Model Content

[0005] To address at least one or more of the technical problems mentioned in the background section, this invention proposes a battery cell encapsulation device with Mylar membrane.

[0006] Therefore, the present invention provides the following technical solution.

[0007] This utility model discloses a battery cell packing Mylar film device, comprising: a gantry frame, on which a Z-axis linear module is provided, and an X-axis linear module connected to the Z-axis linear module. The X-axis linear module is provided with a cross brace, and at both ends of the cross brace are a first finger cylinder and a second finger cylinder arranged opposite to each other. The first finger cylinder and the second finger cylinder are used together to clamp the Mylar film in a flat state and flip the Mylar film 180 degrees. Each finger cylinder is provided with a film pressing roller on one side, and the film pressing roller is used to smooth the raised edge of the Mylar film before the first finger cylinder and the second finger cylinder clamp the Mylar film.

[0008] Preferably, vertical arms are provided at both ends of the cross brace, and the first finger cylinder and the second finger cylinder are rotatably located on the inner side of the two vertical arms. The rotation center lines of the first finger cylinder and the second finger cylinder when rotating relative to the vertical arms are perpendicular to the plane where the Z-axis and X-axis are located.

[0009] Preferably, the outer side of the pressing roller is covered with a silicone layer.

[0010] Preferably, a first pressing mechanism is provided at the middle position of the cross brace. When the Mylar film is rotated 180 degrees and is directly above the battery cell, the first pressing mechanism is used to tension the middle part of the Mylar film and make the middle part of the Mylar film first adhere to the upper surface of the battery cell; it also includes a second pressing mechanism for pressing the edge area of ​​the Mylar film to adhere to the upper surface of the battery cell.

[0011] Preferably, the first pressing mechanism includes a buffer cylinder and a pressure plate connected to the buffer cylinder, and the second pressing mechanism includes two horizontal pressure rollers respectively located at the end of the stroke of the two finger cylinders.

[0012] Preferably, the side of the pressure plate that contacts the Mylar film is covered with a silicone layer, and the outer side of the horizontal pressure roller is covered with a silicone layer.

[0013] Preferably, the two horizontal pressure rollers can rotate around a first and a second vertically oriented axis, respectively, so that when the two finger cylinders clamp the Mylar film and wrap it, the two horizontal pressure rollers rotate around the first and the second axes to move away from and avoid the two finger cylinders; after the pressure plate of the first film pressing mechanism makes the middle part of the Mylar film adhere to the upper surface of the battery cell, the two horizontal pressure rollers reciprocate around the first and the second axes to make the edge area of ​​the Mylar film adhere to the upper surface of the battery cell.

[0014] The technical solution provided in this application may include the following beneficial effects:

[0015] By utilizing the device described above and in several embodiments of this invention, namely, by respectively arranging pressure rollers on one side of two rotatably mounted finger cylinders, the pressure rollers are used to smooth the raised edges of the Mylar film before the first and second finger cylinders clamp the Mylar film, thereby flattening the upward-curving portion. This adjusts the horizontal height of the Mylar film when it is laid flat to be equivalent to the horizontal height of the gap between the finger cylinders, thus ensuring that the beginning position of the Mylar film is at the same height as the clamping gap of the finger cylinders for easy clamping. This reduces human intervention in adjustments, thereby improving the automation efficiency of the equipment. Attached Figure Description

[0016] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts wherein:

[0017] Figure 1 This shows the first perspective view of the present invention;

[0018] Figure 2 This is a second perspective view of the present invention;

[0019] Explanation of reference numerals in the attached drawings: 11. Gantry frame; 12. Z-axis linear module; 13. X-axis linear module; 14. Horizontal brace; 15. First finger cylinder; 16. Second finger cylinder; 17. Pressing roller; 21. Vertical arm; 51. Buffer cylinder; 52. Pressure plate; 53. Horizontal pressure roller. Detailed Implementation

[0020] Embodiments will now be described with reference to the accompanying drawings. It should be understood that, for the sake of simplicity and clarity, reference numerals may be repeated in the drawings to indicate corresponding or similar elements where deemed appropriate. Furthermore, numerous specific details are set forth in this invention to provide a thorough understanding of the embodiments described herein. However, those skilled in the art will understand that the embodiments described herein can be practiced without these specific details. In other instances, well-known methods, processes, and components have not been described in detail so as not to obscure the embodiments described herein. Moreover, this description should not be construed as limiting the scope of the embodiments described herein.

[0021] The term "Mylar film" refers to a polyester film. Developed by the chemical company DuPont in the 1950s, Mylar film is an essential step in the production of lithium-ion batteries, and the manufacturing process is called Mylar film coating.

[0022] like Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, a battery cell packing Mylar film device is provided, comprising: a gantry frame 11, a Z-axis linear module 12 provided on the gantry frame 11, and an X-axis linear module 13 connected to the Z-axis linear module 12. A cross brace 14 is provided on the X-axis linear module 13. The two ends of the cross brace 14 are respectively provided with a first finger cylinder 15 and a second finger cylinder 16 arranged facing each other. The first finger cylinder 15 and the second finger cylinder 16 are used together to clamp the Mylar film in a flat state and flip the Mylar film 180 degrees. A film pressing roller 17 is provided on one side of each finger cylinder. The film pressing roller 17 is used to smooth the curled edge of the Mylar film before the first finger cylinder 15 and the second finger cylinder 16 clamp the Mylar film.

[0023] In one embodiment, the Mylar membrane can be flipped 180 degrees by two finger cylinders. Specifically, vertical arms 21 can be provided at both ends of the cross brace 14. The first finger cylinder 15 and the second finger cylinder 16 are rotatably located on the inner side of the two vertical arms 21. The rotation center line of the first finger cylinder 15 and the second finger cylinder 16 when rotating relative to the vertical arms 21 is perpendicular to the plane where the Z-axis and X-axis are located.

[0024] The fixed ends of the two finger cylinders can be set on different rotating seats at both ends of the vertical arm 21. Each rotating seat is connected to a rotating shaft. By driving one rotating shaft to rotate through two driving devices, the rotation of the two finger cylinders can be controlled.

[0025] In one embodiment, the outer side of the pressure roller 17 is covered with a silicone layer. The silicone layer has good toughness, and when it acts directly on the film, it helps to smooth out any warped edges.

[0026] In some scenarios, the battery cell is relatively long. When the membrane is held by two finger cylinders, the membrane is subjected to force at the corners of the battery cell and the gripping points of the finger cylinders. Therefore, the middle part of the membrane arches slightly upward and is curved. When the membrane is pulled, the middle part of the membrane cannot be attached to the upper surface of the battery cell. Therefore, in some embodiments, a first pressing mechanism can be provided at the middle part of the cross brace 14. When the Mylar membrane is rotated 180 degrees and is directly above the battery cell, the first pressing mechanism is used to tension the middle part of the Mylar membrane and make the middle part of the Mylar membrane first attach to the upper surface of the battery cell. It also includes a second pressing mechanism for pressing the edge area of ​​the Mylar membrane to attach to the upper surface of the battery cell.

[0027] Specifically, the first pressing mechanism includes a buffer cylinder 51 and a pressure plate 52 connected to the buffer cylinder 51, and the second pressing mechanism includes two horizontal pressure rollers 53 respectively located at the end of the stroke of the two finger cylinders.

[0028] In the above embodiment, the side of the pressure plate 52 that contacts the Mylar film is covered with a silicone layer, and the outer side of the horizontal pressure roller 53 is covered with a silicone layer.

[0029] In the above embodiment, the two horizontal pressure rollers 53 can rotate around the first and second rotating axes arranged vertically. The function of the two horizontal pressure rollers 53 is that when the two finger cylinders clamp the Mylar film and wrap it, the two horizontal pressure rollers 53 rotate around the first and second rotating axes to move away from and avoid the two finger cylinders. After the pressure plate 52 of the first film pressing mechanism makes the middle part of the Mylar film adhere to the upper surface of the battery cell, the two horizontal pressure rollers 53 reciprocate around the first and second rotating axes to make the edge area of ​​the Mylar film adhere to the upper surface of the battery cell.

[0030] It should be understood that the possible terms "first" or "second," etc., in the claims, specification, and drawings disclosed in this utility model are used to distinguish different objects, rather than to describe a specific order. The terms "comprising" and "including" used in the specification and claims disclosed in this utility model indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0031] It should also be understood that the terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of the disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0032] Although the embodiments of this utility model are described above, the content is merely an example adopted for the purpose of facilitating understanding of this utility model and is not intended to limit the scope and application scenarios of this utility model. Any person skilled in the art can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this utility model; however, the patent protection scope of this utility model shall still be determined by the scope defined in the appended claims.

Claims

1. An electric cell pack Mylar film device, characterized by, The utility model relates to a kind of Mylar film automatic packaging equipment, including: Gantry (11), Z-axis linear module (12) is equipped on the gantry (11), and X-axis linear module (13) is connected with Z-axis linear module (12), X-axis linear module (13) is equipped with cross brace (14), the two ends of cross brace (14) are respectively with the first finger air cylinder (15) and the second finger air cylinder (16) being oppositely arranged, the first finger air cylinder (15) and the second finger air cylinder (16) are used for clamping Mylar film in flat state and turning over 180 degrees of Mylar film, one side of each finger air cylinder is equipped with film pressing roller (17), film pressing roller (17) is used to flatten the edge of Mylar film before the first finger air cylinder (15) and the second finger air cylinder (16) clamping Mylar film.

2. An electrical cell pack Mylar film apparatus as defined in claim 1, wherein, The two ends of the cross brace (14) are respectively provided with vertical arms (21), and the first finger air cylinder (15) and the second finger air cylinder (16) are rotatably arranged on the inner side of the two vertical arms (21). The rotation center line of the first finger air cylinder (15) and the second finger air cylinder (16) relative to the vertical arm (21) is perpendicular to the plane formed by the Z-axis and the X-axis.

3. An electrical cell pack Mylar film apparatus as defined in claim 1, wherein, The outer side of the film pressing roller (17) is covered with a silica gel layer.

4. An electrical cell pack Mylar film apparatus as defined in claim 1, wherein, A first film pressing mechanism is arranged at the middle position of the cross brace (14). When the Mylar film is turned over 180 degrees and is directly above the battery cell, the first film pressing mechanism is used to tension the middle part of the Mylar film and make the middle part of the Mylar film first adhere to the upper surface of the battery cell. A second film pressing mechanism is further arranged to press the edge region of the Mylar film to adhere to the upper surface of the battery cell.

5. An electrical cell pack Mylar film apparatus as defined in claim 4, wherein, The first film pressing mechanism includes a buffer cylinder (51) and a pressing plate (52) connected to the buffer cylinder (51). The second film pressing mechanism includes two horizontal pressure rollers (53) arranged at the end of the stroke of the two finger air cylinders, respectively.

6. An electrical cell pack Mylar film apparatus as defined in claim 5, wherein, The side of the pressing plate (52) in contact with the Mylar film is covered with a silica gel layer, and the outer side of the horizontal pressure roller (53) is covered with a silica gel layer.

7. An electrical cell pack Mylar film apparatus as defined in claim 5 wherein, The two horizontal pressure rollers (53) can rotate around the first and second vertical shafts, respectively. When the two finger air cylinders clamp the Mylar film and wrap the film, the two horizontal pressure rollers (53) rotate around the first and second vertical shafts, respectively, to move away from and avoid the two finger air cylinders. When the pressing plate (52) of the first film pressing mechanism makes the middle part of the Mylar film adhere to the upper surface of the battery cell, the two horizontal pressure rollers (53) rotate around the first and second vertical shafts, respectively, to make the edge region of the Mylar film adhere to the upper surface of the battery cell.

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