Preparation method, pasting method and film wrapping method of mylar film with double-sided adhesive tape

Abstract

The application provides a preparation method of double-sided adhesive tape for Mylar film, a pasting method and a film wrapping method of a pole group. The preparation method of the double-sided adhesive tape for Mylar film comprises the following steps: coating an adhesive layer on a release paper in conveying, so that the release paper has a plurality of adhesive coating areas and a blank area between two adjacent adhesive coating areas; and then respectively cutting the adhesive coating areas and the blank area, cutting the adhesive coating areas into a plurality of bonding areas, and cutting the blank area into at least two separation areas, the bonding areas and the adjacent separation areas are connected one by one to form a bonding unit, the bonding unit is used for bonding the side of the Mylar film, and a plurality of bonding units connected along the length direction of the release paper are wound to obtain the double-sided adhesive tape. The preparation method of the double-sided adhesive tape for Mylar film is beneficial to improving the processing efficiency of the double-sided adhesive tape, the bonding unit is bonded to the Mylar film through the bonding area, and the release paper is easily torn off through the setting of the separation area, so that the bonding efficiency of the double-sided adhesive tape on the Mylar film is improved.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a method for preparing double-sided adhesive tape for Mylar films. This invention also relates to a method for applying adhesive to Mylar films and a method for coating them. Background Technology

[0002] Currently, blade batteries require Mylar films to be wrapped around their electrode arrays. When wrapping the Mylar film, a single piece of adhesive tape is wrapped around the outer perimeter of the electrode array and then secured by adhesive bonding at both ends. However, as blade batteries become increasingly longer, the traditional method of using double-sided adhesive tape on the Mylar film suffers from low production efficiency and low release paper removal efficiency, hindering the adhesive bonding cycle of the Mylar film and thus affecting the overall wrapping efficiency. Summary of the Invention

[0003] In view of this, the present invention aims to provide a method for preparing double-sided adhesive tape for Mylar film, so as to improve the preparation efficiency of double-sided adhesive tape and at the same time improve the adhesion efficiency of double-sided adhesive tape on Mylar film.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A method for preparing double-sided adhesive tape for Mylar film involves coating an adhesive layer onto release paper during transport, such that the release paper has multiple coated areas and blank areas located between adjacent coated areas.

[0006] The adhesive coating area and the blank area are then cut into multiple bonding areas, and the blank area is cut into at least two tear-off areas. Each bonding area is connected to an adjacent tear-off area to form a bonding unit. The bonding unit is used to bond to the side of the Mylar film. Multiple bonding units arranged together along the length of the release paper are wound up to form a roll of double-sided tape.

[0007] Furthermore, the plurality of adhesive coating areas and the blank areas are arranged alternately along the width direction of the release paper, and the portion of the release paper located outside the outermost adhesive coating area forms a tear-off area;

[0008] The adhesive area is cut into the bonding area along the length of the release paper, and the blank area is cut into the tear-off area, with the tear-off area located on one side of the bonding area.

[0009] Furthermore, the plurality of adhesive coating areas and the blank areas are arranged alternately along the length of the release paper;

[0010] The adhesive coating area and the blanking area are cut along the length of the release paper. In each bonding unit, the tear-off area is located at one end of the bonding area.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] The method for preparing double-sided tape for Mylar film according to the present invention involves coating release paper with adhesive, creating multiple coating areas and blank areas, and then slitting the coating areas and blank areas separately. This allows multiple bonding units, consisting of bonding areas and tear-off areas, to be rolled into a roll of double-sided tape, which improves the processing efficiency of the double-sided tape. Each bonding unit is bonded to the Mylar film through the bonding areas, and the tear-off area facilitates the removal of the release paper, thereby improving the bonding efficiency of the double-sided tape on the Mylar film and making it highly practical.

[0013] Furthermore, by arranging multiple adhesive application areas and blank areas at intervals along the width of the release paper, the tear-off area in each bonding unit can be located on one side of the bonding area. This not only facilitates the layout and implementation but also ensures good adhesion and tear-off performance of the bonding units on the Mylar film. The alternating arrangement of multiple adhesive application areas and blank areas along the length of the release paper, with the tear-off area located at one end of each bonding unit, also improves the forming efficiency of the double-sided tape and enhances its adhesion and tear-off performance on the Mylar film.

[0014] Another objective of this invention is to provide a method for applying adhesive to Mylar film, comprising unwinding a Mylar film and placing double-sided adhesive tapes, prepared by the method described above, on both sides of the Mylar film, and rolling each of the double-sided adhesive tapes and the Mylar film so that the adhesive areas of each adhesive unit on the double-sided adhesive tape are adhered to both sides of the Mylar film. Then, the Mylar film and the adhesive units are cut along the width direction of the Mylar film so that both sides of the Mylar film unit are adhered with the double-sided adhesive tape.

[0015] Furthermore, the Mylar membrane monomer is adsorbed by the adsorption unit, and then the release paper on both sides of the Mylar membrane monomer is torn off.

[0016] Furthermore, when the tear-off area is located on one side of the adhesive area, the release paper is torn off the Mylar film monomer along the length or width direction of the adhesive area.

[0017] Furthermore, when the tear-off area is located at one end of the adhesive area, the release paper is torn off from the Mylar film monomer along the width direction of the adhesive area.

[0018] Furthermore, the release paper is torn off from the adhesive area by gripping the tear-off area with claws; or, the release paper is torn off from the adhesive area by adsorbing the adsorption part of the release paper.

[0019] Furthermore, the width 'a' of the tear-off zone satisfies: 2mm ≤ a ≤ 3mm; and / or,

[0020] The thickness d of the adhesive layer satisfies: 0.02mm ≤ d ≤ 0.10mm, and the width b of the bonding area satisfies: 9mm ≤ b ≤ 11mm.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The adhesive application method for Mylar film described in this invention, through unwinding, rolling, and cutting of Mylar film and double-sided adhesive tape, can obtain Mylar film units with double-sided adhesive tape adhered to both sides, thus facilitating wrapping on the unit. Moreover, the adhesive application method is easy to implement, has high efficiency, and helps to improve production efficiency.

[0023] Furthermore, adsorbing Mylar film monomers through the adsorption unit helps prevent the release paper from affecting the Mylar film monomers during tearing, thereby improving the encapsulation effect of the Mylar film monomers on the electrode assembly. When the tear-off zone is located on one side of the adhesive zone, tearing the release paper along the length or width of the adhesive zone yields good tearing results and is easy to implement. When the tear-off zone is located at one end of the adhesive zone, tearing the release paper along the width of the adhesive zone also yields good tearing results. Holding the tear-off zone with grippers makes it easy to tear off the release paper; adsorbing the release paper with the adsorption unit and tearing it off also yields good tearing results. The settings of the tear-off zone width, adhesive layer thickness, and adhesive zone width all contribute to improving the adhesion of the double-sided tape to the Mylar film and facilitate the tearing off of the release paper.

[0024] In addition, another objective of the present invention is to provide a coating method for an electrode assembly, comprising bonding the two sides of the upper Mylar film monomer obtained by the adhesive bonding method described above to the two sides of the electrode assembly.

[0025] The two sides of the lower Mylar membrane monomer prepared by the adhesive bonding method described above are then bonded to the two sides of the upper Mylar membrane monomer.

[0026] The coating method for electrode groups described in this invention is beneficial for improving the coating efficiency of electrode groups. Attached Figure Description

[0027] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of one of the double-sided tapes described in Embodiment 1 of the present invention before slitting;

[0029] Figure 2 for Figure 1 A schematic diagram of the double-sided tape after slitting, as described above;

[0030] Figure 3 This is a schematic diagram of another structural form of the double-sided tape described in Embodiment 1 of the present invention before slitting;

[0031] Figure 4 for Figure 3 A schematic diagram of the double-sided tape after slitting, as described above;

[0032] Figure 5 This is a schematic diagram of one tearing method of the first type of release paper described in Embodiment 2 of the present invention;

[0033] Figure 6 This is a schematic diagram of the first type of release paper described in Embodiment 2 of the present invention in another tearing method;

[0034] Figure 7 This is a schematic diagram of one tearing method of the second type of release paper described in Embodiment 2 of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Blank area; 2. Coating area; 3. Mylar membrane; 4. Mylar membrane monomer;

[0037] 101, tear zone; 201, adhesive zone. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0039] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "back" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] This embodiment relates to a method for preparing double-sided adhesive tape for Mylar film 3. Generally speaking, the preparation method includes: coating an adhesive layer onto a release paper being transported, such that the release paper has multiple adhesive areas 2 and blank areas 1 located between two adjacent adhesive areas 2.

[0042] Next, the adhesive coating area 2 and the blank area 1 are cut separately. The adhesive coating area 2 is cut into multiple adhesive areas 201, and the blank area 1 is cut into at least two tear-off areas 101. Each adhesive area 201 is connected to an adjacent tear-off area 101 to form an adhesive unit. The adhesive unit is used to adhere to the side of the Mylar film 3. Multiple adhesive units connected together along the length of the release paper are wound up to form a roll of double-sided tape.

[0043] Based on the above overview, as a preferred implementation method, such as Figure 1 and Figure 2 As shown, multiple adhesive application areas 2 and blank areas 1 are arranged alternately along the width direction of the release paper, and the portion of the release paper outside the outermost adhesive application area 2 forms a tear-off area 101. Each adhesive application area 2 and the blank area 1 are cut along the length direction of the release paper, and in each bonding unit, the tear-off area 101 is located on one side of the bonding area 201.

[0044] Each adhesive application area 2 and all tear-off areas 101 except the two outermost tear-off areas 101 of the release paper are cut by a die-cutting mechanism, dividing the adhesive application area 2 into two left and right bonding areas 201, and dividing the blank area 1 into two left and right tear-off areas 101. Simultaneously, each bonding area 201 has a tear-off area 101 on one side, allowing the bonding unit to be bonded to the Mylar film 3 via the bonding area 201 and the release paper to be peeled off via the tear-off area 101. This improves the processing efficiency of the double-sided tape while also enhancing the adhesion of the double-sided tape to the Mylar film 3 and the tear-off efficiency of the release paper.

[0045] When tearing the release paper in a single bonding unit, the tearing area 101 can be clamped by external force and moved along the length or width of the release paper to tear it off. This provides good operational convenience and helps to improve the tearing efficiency of the release paper.

[0046] As another preferred implementation, such as Figure 3 and Figure 4As shown, multiple adhesive application areas 2 and blank areas 1 are arranged alternately along the length of the release paper. Each adhesive application area 2 and blank area 1 is cut along the length of the release paper. In each bonding unit, the tear-off area 101 is located at one end of the bonding area 201. At this time, after the bonding area 201 on each bonding unit is bonded to the Mylar film 3, the release paper can still be torn off along the length or width of the Mylar film 3 through the tear-off area 101 at the end. This not only facilitates the bonding of double-sided tape to the Mylar film 3 but also facilitates the tearing off of the release paper, resulting in good tearing efficiency.

[0047] In this embodiment, the adhesive is applied to the release paper using existing adhesive coating equipment, and the double-sided tape is wound around the roll. The double-sided tape is rolled together by winding the release paper, which facilitates the transportation and use of the double-sided tape.

[0048] The method for preparing double-sided tape for Mylar film 3 described in this embodiment involves coating the release paper with adhesive, creating multiple coating areas 2 and blank areas 1. The coating areas 2 and blank areas 1 are then cut separately, allowing multiple bonding units, consisting of bonding areas 201 and tear-off areas 101, to be rolled into a roll of double-sided tape. This improves the processing efficiency of the double-sided tape. Each bonding unit is bonded to the Mylar film 3 via the bonding areas 201, and the tear-off areas 101 facilitate the removal of the release paper, thereby improving the bonding efficiency of the double-sided tape on the Mylar film 3 and demonstrating good practicality.

[0049] Example 2

[0050] This embodiment relates to a method for applying adhesive to a Mylar film 3. The method includes: unwinding the Mylar film 3 and placing double-sided adhesive tapes prepared by the method of preparing double-sided adhesive tape in Embodiment 1 on both sides of the Mylar film 3, and rolling each double-sided adhesive tape and the Mylar film 3 so that the bonding areas 201 in each bonding unit on the double-sided adhesive tape are bonded to both sides of the Mylar film 3, and then cutting the Mylar film 3 and the bonding units along the width direction of the Mylar film 3 so that both sides of the Mylar film unit 4 are bonded with double-sided adhesive tape.

[0051] In this embodiment, both the Mylar film 3 and the double-sided adhesive tape are unwound by unwinding rollers. During unwinding, the bonding areas 201 of each double-sided adhesive tape are bonded to both sides of the Mylar film 3. In this embodiment, multiple pressure roller units arranged along the conveying direction are used for rolling to improve the bonding strength between the bonding areas 201 and the Mylar film 3. Specifically, each pressure roller unit includes pressure rollers rotatably positioned on the upper and lower sides of both the release paper and the Mylar film 3. These two pressure rollers can roll the double-sided adhesive tape and the Mylar film 3 during conveying, which improves production efficiency and provides a better rolling effect.

[0052] In this embodiment, the Mylar membrane 3 with double-sided adhesive tape is cut by a film cutting mechanism in the prior art to obtain multiple Mylar membrane monomers 4 that are separated from each other. The Mylar membrane monomers 4 are wrapped on the electrode assembly by double-sided adhesive tape on both sides.

[0053] To facilitate the removal of the release paper from the bonding area 201, in this embodiment, the Mylar membrane monomer 4 is adsorbed by an adsorption unit, and then the release paper on both sides of the Mylar membrane monomer 4 is torn off. Specifically, the adsorption unit here can be a vacuum adsorption unit used in the prior art for vacuum adsorption of the Mylar membrane monomer 4. For example, the vacuum adsorption unit includes an adsorption plate with a vacuum chamber, and the adsorption plate is provided with multiple adsorption holes communicating with the vacuum chamber. The vacuum chamber is connected to an external negative pressure device, so that the adsorption plate can adsorb and hold the Mylar membrane monomer 4 through the multiple adsorption holes. With this configuration, the Mylar membrane monomer 4 can remain flat during the process of external force tearing off the release paper, and is not affected by the tearing off of the release paper, thus facilitating its wrapping on the electrode assembly and achieving a better coating effect.

[0054] Furthermore, as a structural example, in this embodiment, the width 'a' of the tear-off area 101 in each adhesive unit satisfies the following condition: 2mm ≤ a ≤ 3mm. When the width 'a' of the tear-off area 101 is greater than 3mm, it will result in waste of release paper; when the width 'a' of the tear-off area 101 is less than 2mm, it will be difficult to operate the tear-off area 101 to tear off the release paper. In specific implementations, for example, the width 'a' of the tear-off area 101 is 2mm, 2.5mm, or 3mm.

[0055] In this embodiment, the thickness d of the adhesive layer satisfies the condition: 0.02mm ≤ d ≤ 0.10mm, to achieve a better bonding effect. Specifically, when the thickness d < 0.02mm, the adhesion of the double-sided tape to the Mylar film 3 is poor, thus affecting the coating effect of the electrode assembly. When the thickness d > 0.1mm, there will be waste of adhesive, which is not conducive to reducing production costs. In specific implementations, the thickness d of the adhesive layer can be 0.02mm, 0.025mm, 0.03mm, 0.05mm, 0.07mm, 0.09mm, or 0.10mm.

[0056] In addition, in this embodiment, the width b of the bonding area 201 satisfies: 9mm ≤ b ≤ 11mm, which is beneficial for meeting the bonding requirements of most Mylar films 3. In specific implementation, the width b of the bonding area 201 can be 9mm, 10mm, or 11mm. To prevent adhesive overflow from affecting the performance, the distance between the outer side of the adhesive layer on the bonding area 201 and the side edge of the Mylar film 3 on the same side is approximately 1mm.

[0057] The length L of each bonding unit satisfies the following condition: 600mm ≤ L ≤ 1000mm. This setting of the length L range for each bonding unit allows it to be adapted to longer blade batteries, improving the coating effect of the electrode assembly and shortening the travel distance when tearing off the release paper, thus significantly increasing production efficiency. Of course, the length of each bonding unit can be determined according to usage requirements and is not limited to the above range.

[0058] In a preferred embodiment, the release paper is peeled off from the adhesive area 201 by gripping the tear-off area 101 with claws. In practice, four or two claws can be used to peel the release paper horizontally. In this way, the claws only need to move 12-13mm when peeling the release paper, which is much shorter than the longitudinal stroke of double-sided tape (600mm-1000mm or even longer). This greatly shortens the peeling stroke of the release paper, thereby improving production efficiency.

[0059] For ease of description, the release paper when the tear-off area 101 is located on one side of the adhesive area 201 is referred to as the first type of release paper. The release paper when the tear-off area 101 is located at the end of the adhesive area 201 is referred to as the second type of release paper. Specifically, as... Figure 5 As shown, when the tear-off area 101 is located on one side of the adhesive area 201, the release paper is torn off the Mylar film monomer 4 along the length or width direction of the adhesive area 201. This facilitates the application of external force to the tear-off area 101 located on the side, thereby tearing off the release paper. Specifically, when tearing the release paper along the length direction of the Mylar film monomer 4, a set of grippers is sufficient. Two grippers in the set are located at the ends of each tear-off area 101, respectively clamping the ends of the tear-off area 101 and moving along the length direction of the Mylar film monomer 4, thereby tearing off the release paper.

[0060] like Figure 6 As shown, when the release paper is torn off along the width direction of the Mylar film monomer 4, two sets of grippers are used. Two grippers in one set are respectively located at the two ends of each tearing area 101, respectively gripping the corresponding ends of the tearing area 101 and moving along the width direction of the Mylar film monomer 4, thereby tearing off the release paper.

[0061] When the tear-off zone 101 is located at one end of the adhesive zone 201, the release paper is peeled off from the Mylar film monomer 4 along the width direction of the adhesive zone 201. Figure 7 As shown, in specific implementation, a set of grippers is sufficient. Each gripper is located at one end of each tear-off zone 101, clamping the corresponding end of the tear-off zone 101 and moving along the width direction of the Mylar film monomer 4, thereby tearing off the release paper.

[0062] It should be noted that, in addition to using grippers to hold the release paper in the tear-off area 101 to tear it off, in this embodiment, the release paper is peeled off from the adhesive area 201 by adsorbing the release paper's adsorption part. In specific implementation, a vacuum suction cup can be used to adsorb the release paper, and then the release paper can be peeled off by the action of the vacuum suction cup. The air pressure and other parameters of the vacuum suction cup can be determined according to the usage requirements.

[0063] The adhesive application method of the Mylar film 3 described in this embodiment, through unwinding, rolling, and cutting of the Mylar film 3 and double-sided adhesive tape, can obtain Mylar film monomers 4 with double-sided adhesive tape bonded to both sides, which is convenient for wrapping on the unit. Moreover, the adhesive application method is easy to implement, has high adhesive application efficiency, and helps to improve production efficiency.

[0064] Example 3

[0065] This embodiment relates to a coating method for an electrode assembly, comprising bonding the two sides of the upper Mylar membrane monomer obtained by the adhesive bonding method described in Embodiment 2 to the two sides of the electrode assembly; and bonding the two sides of the lower Mylar membrane monomer obtained by the adhesive bonding method described in Embodiment 2 to the two sides of the upper Mylar membrane monomer.

[0066] Specifically, the two sides of the upper Mylar membrane monomer are folded downwards to form upward folded edges. Double-sided adhesive tape is applied to the inside of these upward folded edges to bond the two sides of the upper Mylar membrane monomer to the sides of the electrode assembly. The two sides of the lower Mylar membrane monomer are folded upwards to form downward folded edges. Double-sided adhesive tape is applied to the inside of these downward folded edges to bond the two sides of the upper Mylar membrane monomer to the outside of these upward folded edges, thus completing the coating of the electrode assembly. Of course, the coating order of the upper and lower Mylar membrane monomers can be adjusted as needed.

[0067] The coating method for the electrode assembly described in this embodiment has high coating efficiency and good practicality.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a double-sided adhesive tape for Mylar film, characterized in that: This includes applying an adhesive layer to release paper during transport, such that the release paper has multiple adhesive areas and blank areas located between two adjacent adhesive areas; The adhesive coating area and the blank area are then cut into multiple bonding areas, and the blank area is cut into at least two tear-off areas. Each bonding area is connected to an adjacent tear-off area to form a bonding unit. The bonding unit is used to bond to the side of the Mylar film. Multiple bonding units connected along the length of the release paper are wound up to form a roll of double-sided tape. Multiple adhesive coating areas and blank areas are arranged alternately along the width direction of the release paper, and the portion of the release paper outside the outermost adhesive coating area forms a tear-off area; The adhesive application area and the blanking area are cut along the length of the release paper, and in each bonding unit, the tear-off area is located on one side of the adhesive area; The width a of the tear-off zone satisfies: 2mm≤a≤3mm; the thickness d of the adhesive layer satisfies: 0.02mm≤d≤0.10mm; the width b of the bonding zone satisfies: 9mm≤b≤11mm; and the length L of the bonding unit satisfies: 600mm≤L≤1000 mm.

2. A method for applying adhesive to Mylar film, characterized in that: The method includes unwinding a Mylar film and placing double-sided adhesive tapes, prepared by the method described in claim 1, on both sides of the Mylar film. The method involves rolling the double-sided adhesive tapes and the Mylar film together, such that the adhesive areas of each adhesive unit on the double-sided adhesive tape are bonded to both sides of the Mylar film. The Mylar film and the adhesive units are then cut along the width of the Mylar film, so that both sides of the Mylar film unit are bonded with the double-sided adhesive tape.

3. The adhesive application method for Mylar film according to claim 2, characterized in that: The Mylar membrane monomer is adsorbed by the adsorption unit, and then the release paper on both sides of the Mylar membrane monomer is torn off.

4. The adhesive application method for Mylar film according to claim 3, characterized in that: When the tear-off zone is located on one side of the adhesive zone, the release paper is torn off the Mylar film monomer along the length or width direction of the adhesive zone.

5. The adhesive application method for Mylar film according to claim 3, characterized in that: When the tear-off zone is located at one end of the adhesive zone, the release paper is torn off the Mylar film monomer along the width direction of the adhesive zone.

6. The method for applying adhesive to Mylar film according to claim 4 or 5, characterized in that: The release paper is torn off from the adhesive area by gripping the tear-off area with claws; or, the release paper is torn off from the adhesive area by adsorbing the adsorption part of the release paper.

7. A coating method for an electrode assembly, characterized in that: This includes bonding the two sides of the Mylar membrane monomer obtained by the adhesive bonding method according to any one of claims 2 to 6 to the two sides of the electrode assembly; The two sides of the lower Mylar film monomer obtained by the adhesive bonding method according to any one of claims 2 to 6 are bonded to the two sides of the upper Mylar film monomer.

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