Adhesive tape

Abstract

The utility model discloses gummed paper, and belongs to the technical field of batteries, and the gummed paper comprises a first film layer; the adhesive layer is arranged on the first film layer; the second film layer is arranged on the side, away from the first film layer, of the adhesive layer, the second film layer comprises a body part and a plurality of first protruding parts, the body part is attached to the adhesive layer, at least part of each first protruding part is embedded into the adhesive layer, and the second film layer is configured in the mode that the body part can be separated from the adhesive layer; the part, embedded into the adhesive layer, of the first lug boss is driven to move out of the adhesive layer, so that a plurality of exhaust channels which can be communicated with external air are formed in one side, far away from the first film layer, of the adhesive layer; according to the invention, the first protruding part is embedded into the adhesive layer, so that a plurality of exhaust channels can be formed after the second film layer is separated from the adhesive layer, and air can be exhausted through the exhaust channels in the process of attaching the adhesive layer to the battery cell, so that the adhesive layer can be fully attached to the surface of the battery cell, the generation of bubbles is reduced, and the product yield is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a kind of adhesive tape. Background Art

[0002] During the packaging of existing battery cells, insulating protective film is typically used to secure the cell or its connected components and ensure the insulation of the outer surface. However, during the bonding process, air between the insulating film and the cell often cannot be expelled in time, resulting in bubbles and affecting product yield. Utility Model Content

[0003] Purpose of the utility model: The embodiment of the present application provides an adhesive tape, which aims to solve the technical problem that when the insulating protective film is currently pasted, the air between it and the battery cell often cannot be discharged in time, thereby generating bubbles and affecting the product yield.

[0004] Technical solution: The adhesive tape described in the embodiment of the present application includes:

[0005] first film layer;

[0006] an adhesive layer, disposed on the first film layer;

[0007] The second film layer is arranged on a side of the adhesive layer away from the first film layer, the second film layer includes a main body and a plurality of first protrusions, the main body is attached to the adhesive layer, and the plurality of first protrusions are all connected to a side of the main body facing the adhesive layer, each of the first protrusions extends to the edge of the first film layer, and at least a portion of each of the first protrusions is embedded in the adhesive layer. The second film layer is configured so that the main body can be detached from the adhesive layer and drive the portion of the first protrusion embedded in the adhesive layer to move out of the adhesive layer, so that a plurality of exhaust channels that can communicate with the external air are formed on the side of the adhesive layer away from the first film layer.

[0008] In some embodiments, a plurality of the first protrusions are arranged at intervals along a first direction and extend along a second direction, and the first direction intersects with the second direction.

[0009] In some embodiments, it also includes a plurality of second protrusions, which are arranged at intervals along the second direction and extend along the first direction to the edge of the first film layer. The plurality of second protrusions are all connected to the main body, and each of the second protrusions is connected to the plurality of first protrusions. At least a portion of each second protrusion is embedded in the adhesive layer.

[0010] In some embodiments, the first film layer has a folding line, and the extension directions of the first protrusion and the second protrusion are both arranged at an angle to the folding line.

[0011] In some embodiments, the adhesive tape includes a plurality of adhesive layers, at least one adhesive layer is spaced apart from another adhesive layer to form an isolation portion;

[0012] The adhesive tape is configured to adhere the first film layer to a plurality of battery cells through the adhesive layer, and to arrange the isolation portion toward the gaps between the battery cells.

[0013] In some embodiments, the adhesive tape further includes an isolation film, and the isolation film is attached to a side of the adhesive layer away from the first film layer.

[0014] In some embodiments, the isolation film is disposed between the adhesive layer and the main body.

[0015] In some embodiments, a plurality of first protrusions are disposed on both sides of the isolation film.

[0016] In some embodiments, the second film layer includes a plurality of body portions, the plurality of body portions are disposed on both sides of the isolation film, and each of the body portions is provided with a plurality of first protrusions.

[0017] In some embodiments, the isolation film is made of a polyimide film, a polypropylene film, or a polyamide film.

[0018] Beneficial effect: When the adhesive tape of the present application is used, the second film layer is torn off, and the adhesive layer forms multiple exhaust channels due to the detachment of the first protrusion. During the process of attaching the adhesive layer to the battery cell, the air can be discharged through the exhaust channels, so that the adhesive layer can fully fit with the surface of the battery cell, reducing the generation of bubbles, thereby improving the product yield; the first protrusion has the effect of increasing the strength of the second film layer, so that the overall strength and bending strength of the adhesive tape are improved, which plays a protective role on the adhesive tape, so as to reduce the possibility of wrinkles on the adhesive tape due to external force when not in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A cross-sectional view of the adhesive tape provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the distribution of the first protrusion and the second protrusion provided in an embodiment of the present application;

[0022] Figure 3Another schematic diagram of the distribution of the first protrusion and the second protrusion provided in an embodiment of the present application;

[0023] Figure 4 Schematic diagram of the adhesive layer and the isolation portion provided in the embodiment of the present application;

[0024] Figure 5 Schematic diagram of the isolation membrane provided in the embodiment of the present application;

[0025] Figure 6 A schematic diagram of the distribution position of the first protrusions provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the distribution position of the second film layer provided in an embodiment of the present application;

[0027] Reference numerals: 1, first film layer; 2, adhesive layer; 21, isolation portion; 3, second film layer; 31, main body portion; 32, first protruding portion; 33, second protruding portion; 4, isolation film. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of this application.

[0029] In the description of this application, it should be understood that the terms "height", "thickness", "up", "down", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting this application. In the description of this application, "plurality" means two or more, and at least one means one, two, or more than two, unless otherwise clearly and specifically defined.

[0030] As a preface to the implementation of the present application, in the existing battery structure, a dual-cell layout is adopted, with PCM boards placed on the pole side of the two cells. During packaging, the two cells are glued and fixed with an insulating protective film. At the same time, in order to fix the PCM board and the cell, the PCM board is also wrapped with an insulating protective film, and the insulating protective film is folded, and the two sides of the insulating protective film are respectively glued to the two large surfaces of the cell, and the PCM board and the cell are glued together. Since the area of ​​the insulating protective film is relatively large, the air cannot be discharged in time during the pasting, and bubbles are easily generated on the outer surface of the battery body. In addition, since there is a gap between the two cells, when the whole machine is subjected to a bending test, the glue layer corresponding to the gap part will stick to or separate from the cell and / or PCM board, and the abnormal sound is obvious.

[0031] In view of this, an embodiment of the present application provides an adhesive tape, aiming to solve at least one of the above-mentioned technical problems.

[0032] Please combine Figure 1 and Figure 2 The adhesive tape of the embodiment of the present application includes a first film layer 1, an adhesive layer 2 and a second film layer 3; the adhesive layer 2 is coated on the base layer for bonding, and the adhesive layer 2 can also be formed on the surface of the first film layer 1 by bonding, spraying, dipping or other forms. The coverage area of ​​the adhesive layer 2 is not larger than the area of ​​the first film layer 1. The second film layer 3 is arranged on the side of the adhesive layer 2 away from the first film layer 1. The second film layer 3 includes a main body 31 and a plurality of first protrusions 32. The main body 31 is arranged opposite to the adhesive layer 2 and attached to the adhesive layer 2. The plurality of first protrusions 32 are arranged on the side of the main body 31 facing the adhesive layer 2 and are connected to the main body 31. Each first protrusion 32 extends to the edge of the first film layer 1, that is, the end faces of the first protrusion 32 at both ends along the extension direction are flush with the outer peripheral surface of the first film layer 1; at least part of each first protrusion 32 is embedded in the adhesive layer 2, and the second film layer 3 is configured so that the main body 31 can detach from the adhesive layer 2 and drive the part of the first protrusion 32 embedded in the adhesive layer 2 to move out of the adhesive layer 2, so that a plurality of exhaust channels that can be connected to the external air are formed on the side of the adhesive layer 2 away from the first film layer 1.

[0033] The plurality of first protrusions 32 separate the adhesive layer 2 into a plurality of area blocks, two adjacent area blocks are spaced apart and form an exhaust channel, and each first protrusion 32 extends to the edge of the first film layer 1, so that the first protrusion 32 can pass through the entire adhesive layer 2, thereby allowing the exhaust channel to communicate with the external air; The material of the body part 31 and the first protrusion 32 can be one of polyethylene (PE), polyester (PET), polypropylene (PP) or polyurethane. The surface of such material has a separation property, which can reduce the adhesion when the second film layer 3 is separated from the adhesive layer 2, so that the adhesive layer 2 maintains the state before being separated by the first protrusion 32, and the exhaust channel remains unobstructed. The body part 31 and the first protrusion 32 are integrally formed by stamping process or injection molding process, or are fixed by hot melting and pasting.

[0034] When pasting, the second film layer 3 is torn, and then the adhesive layer 2 is attached to the battery cell and / or PCM plate and is evenly smoothed. Due to the existence of the exhaust channel, the air between the first film layer 1 and the surface of the battery cell and / or PCM plate cannot be exhausted in time and can be exhausted through the exhaust channel, reducing the possibility of air bubbles caused by air residues, and facilitating the improvement of product yield. The exhaust channel is formed by extrusion of the first protrusion 32. Compared with removing a part of the adhesive layer 2 to form the exhaust channel by processes such as mechanical degumming, solvent degumming, laser degumming, etc., the process steps are relatively simple, which is beneficial to improve the processing efficiency.

[0035] Please refer to Figure 2 In some embodiments, the plurality of first protrusions 32 are spaced apart along a first direction and extend along a second direction, the first direction intersects the second direction, the first direction is the length direction of the adhesive paper, and the second direction is the width direction of the adhesive paper, or the first direction is the width direction of the adhesive paper, and the second direction is the length direction of the adhesive paper. The specific length direction and width direction will change due to the placement of the adhesive paper. In some other embodiments, especially when the adhesive paper is of an irregular shape, the first direction can also be a direction parallel or intersecting to one side of the adhesive paper, and the second direction is distributed at an angle with the first direction. By setting the spaced apart direction and the extending direction of the first protrusion 32, the first protrusion 32 is regularly arranged, so that the adhesive layer 2 can be separated into a plurality of area blocks which are relatively uniform, thereby increasing the uniformity of the force received by the adhesive layer 2 during the bonding process, which helps to reduce the generation of air bubbles.

[0036] Please refer to Figure 2In some embodiments, the second film layer 3 further includes a plurality of second protrusions 33, which are spaced apart along the second direction and extend along the first direction to the edge of the first film layer 1. The plurality of second protrusions 33 are connected to the main body 31, and each second protrusion 33 is connected to the plurality of first protrusions 32. At least a portion of each second protrusion 33 is embedded in the adhesive layer 2. The second protrusions 33 are connected to the second film layer 3 in the same manner as the first protrusions 32, and will not be further described here. The second protrusions 33 and the first protrusions 32 form a criss-cross grid pattern, further enhancing the overall strength and bending resistance of the adhesive tape. This also further separates the adhesive layer 2. This increases the number of separated regions of the adhesive layer 2, reducing the area of ​​each region, and facilitating air expulsion during bonding. Furthermore, this allows the adhesive layer 2 to conform to uneven surfaces on batteries and PCM boards, reducing the possibility of hollowing between the adhesive layer 2 and the bonded component.

[0037] Please refer to Figure 3 In some embodiments, the first film layer 1 has a fold line M, and the first and second raised portions 32, 33 extend at an angle to the fold line M. The fold line M is where the adhesive tape folds during application, and this position varies depending on the relative position of the adhesive tape and the object being applied. Having both the first and second raised portions 32, 33 intersecting at the fold line M allows them to maintain contact with the PCM board even in the folded position, reducing the likelihood of the PCM board being positioned precisely between the first and second raised portions 32, 33, thereby enhancing bonding stability.

[0038] Please refer to Figure 4 In some embodiments, the adhesive tape includes a plurality of adhesive layers 2, each of which is arranged on the first film layer 1, and at least one adhesive layer 2 is spaced apart from another adhesive layer 2 to form an isolation portion 21. The isolation portion 21 is the spacing area between two adjacent adhesive layers 2, that is, the first film layer 1 is not coated with glue here, or the glue at the isolation portion 21 is removed later by a debonding process. The adhesive tape is configured to adhere the first film layer 1 to a plurality of battery cells through the adhesive layer 2, and to arrange the isolation portion 21 toward the gap between the battery cells. When the adhesive tape is pasted, the isolation portion 21 is aligned with the gap between the battery cells, so that the adhesive layer 2 is separated from the battery cells and / or PCM board, so as to prevent the adhesive layer 2 from adhering to or separating from the battery cells and / or PCM board at the position corresponding to the gap between the battery cells during the bending test, thereby reducing the possibility of abnormal noise.

[0039] Please refer to Figure 5In some embodiments, the adhesive tape further includes a separator 4, which is attached to the side of the adhesive layer 2 away from the first film layer 1. The separator 4 partially covers the adhesive layer 2. During application, the separator 4 covers the gaps between the battery cells, while the remaining portion is adhered and fixed by the adhesive layer 2. This is simple and convenient. The separator 4 also increases the thickness of the first film layer 1 at the gaps between the battery cells, thereby improving the strength there.

[0040] Please refer to Figure 5 In some embodiments, the isolation film 4 is disposed between the adhesive layer 2 and the main body 31. The main body 31 covers the isolation film 4 to protect the isolation film 4.

[0041] Please refer to Figure 6 In some embodiments, multiple first protrusions 32 are disposed on both sides of the isolation membrane 4. These multiple first protrusions 32 are spaced apart from the isolation membrane 4, avoiding the isolation membrane 4. This prevents the first protrusions 32 from overlapping the isolation membrane 4, thereby reducing the overall thickness of the adhesive tape at the isolation membrane 4. Accordingly, multiple second protrusions 33 can also be disposed on both sides of the isolation membrane 4. In this case, the exhaust channel is also divided into two areas, distributed on both sides of the isolation membrane 4.

[0042] Please refer to Figure 7 In some embodiments, the second film layer 3 includes multiple main portions 31, which are arranged on both sides of the isolation film 4 and attached to the adhesive layer 2. Each main portion 31 is provided with multiple first protrusions 32. The isolation film 4 and the multiple main portions 31 are arranged side by side, reducing the distance between the surface of the isolation film 4 facing away from the adhesive layer 2 and the surface of the main portion 31 facing away from the adhesive layer 2, further reducing the overall thickness of the adhesive tape. During use, the two second film layers 3 can be torn off, leaving the isolation film 4 alone on the adhesive layer 2, which is convenient and quick. At the same time, the reduced area of ​​a single main portion 31 can reduce stress concentration and the tensile force exerted on the main portion 31 when it is separated from the adhesive layer 2, thereby maintaining the flatness of the first film layer 1. Accordingly, each main portion 31 is also provided with multiple second protrusions 33, which divide the first protrusions 32 and second protrusions 33 into areas, thereby avoiding the isolation film 4 and maintaining the flatness of the isolation film 4.

[0043] In some embodiments, the isolation film 4 is made of a polyimide film, a polypropylene film, or a polyamide film, which has excellent electrical insulation properties and chemical stability and can be selected according to design requirements to meet different packaging processes.

[0044] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0045] The above is a detailed introduction to the adhesive tape provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A tape, characterized in that: include: a first film layer (1); An adhesive layer (2) is provided on the first film layer (1); The second film layer (3) is arranged on the side of the adhesive layer (2) away from the first film layer (1), and the second film layer (3) includes a main body (31) and a plurality of first protrusions (32). The main body (31) is attached to the adhesive layer (2), and the plurality of first protrusions (32) are all connected to the side of the main body (31) facing the adhesive layer (2). Each first protrusion (32) extends to the edge of the first film layer (1), and at least a portion of each first protrusion (32) is embedded in the adhesive layer (2). The second film layer (3) is configured so that the main body (31) can be detached from the adhesive layer (2) and drive the portion of the first protrusion (32) embedded in the adhesive layer (2) to move out of the adhesive layer (2), so that a plurality of exhaust channels that can communicate with external air are formed on the side of the adhesive layer (2) away from the first film layer (1).

2. The adhesive tape according to claim 1, characterized in that: A plurality of the first protrusions (32) are arranged at intervals along a first direction and extend along a second direction, wherein the first direction intersects with the second direction.

3. The adhesive tape according to claim 2, characterized in that: The second film layer (3) further comprises a plurality of second protrusions (33), the plurality of second protrusions (33) being arranged at intervals along the second direction and extending along the first direction to the edge of the first film layer (1), the plurality of second protrusions (33) being connected to the main body (31), each of the second protrusions (33) being connected to the plurality of the first protrusions (32), and at least a portion of each of the second protrusions (33) being embedded in the adhesive layer (2).

4. The adhesive tape according to claim 3, characterized in that: The first film layer (1) has a folding line, and the extension directions of the first protrusion (32) and the second protrusion (33) are both arranged at an angle to the folding line.

5. The adhesive tape according to claim 1, characterized in that: The adhesive tape comprises a plurality of adhesive layers (2), at least one adhesive layer (2) is spaced apart from another adhesive layer (2), and an isolation portion (21) is formed; The adhesive paper is configured to adhere the first film layer (1) to a plurality of battery cells through the adhesive layer (2), and to arrange the isolation portion (21) toward the gaps between the battery cells.

6. The adhesive tape according to claim 1, characterized in that: The adhesive tape further comprises an isolation film (4), and the isolation film (4) is attached to the side of the adhesive layer (2) away from the first film layer (1).

7. The adhesive tape according to claim 6, characterized in that: The isolation film (4) is arranged between the adhesive layer (2) and the main body (31).

8. The adhesive tape according to claim 7, characterized in that: A plurality of the first protrusions (32) are arranged on both sides of the isolation membrane (4).

9. The adhesive tape according to claim 6, characterized in that: The second film layer (3) comprises a plurality of main body portions (31), the plurality of main body portions (31) being arranged on both sides of the isolation film (4), and each of the main body portions (31) being provided with a plurality of first protrusions (32).

10. The adhesive tape according to claim 6, characterized in that: The material of the isolation film (4) is one of a polyimide film, a polypropylene film or a polyamide film.

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