Aluminum-plastic film with non-curled punching pits

Abstract

The utility model belongs to the technical field of aluminum plastic films, and particularly relates to an aluminum plastic film with a non-curled punching pit, which comprises an outer layer, a first bonding layer, an aluminum foil layer, a second bonding layer and a CPP (casting polypropylene) film layer, and a PET (polyethylene terephthalate) film layer is arranged between the aluminum foil layer and the CPP film layer. The outer layer and the aluminum foil layer are bonded through a first bonding layer; the aluminum foil layer and the PET film layer are bonded through a second bonding layer; the PET film layer and the CPP film layer are bonded through a third bonding layer, after the aluminum plastic film with the uncurled punched pits is punched, a shell is curled outwards due to stress stretching, the PET film layer can effectively improve the tensile property, the stress distribution of the shell is uniform, and the punched pit curled phenomenon is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of aluminum-plastic films, in particular to an aluminum-plastic film with punched holes and no curling. Background Art

[0002] With the rapid development of the flexible packaging lithium-ion battery industry, the demand for aluminum-plastic films in the flexible packaging field is increasing.

[0003] The packaging of lithium batteries using aluminum-plastic film generally includes the following steps: 1. First, the aluminum-plastic film is punched / deepened to form a shell; 2. The battery cell is placed in the shell and the top side is heat-sealed (first seal); 3. After the heat sealing is completed, the battery cell is formed and the liquid is injected (second seal); 4. Curing.

[0004] In the relevant technology, although the existing aluminum-plastic film can meet the requirements of punching performance, the shell after punching is easy to curl toward the outer layer at the reserved heat-sealed edge; this curling will not only increase the difficulty of employees' operation during regular storage, trimming, discharging cores, top sealing, and side sealing, but the uneven heat-sealed edge will also affect the heat transfer effect of the heat-sealing head, resulting in reduced production efficiency and heat-sealing quality, and even affecting the battery yield.

[0005] Therefore, how to solve the technical problem that the reserved heat-sealed edge of the existing aluminum-plastic film is easily curled toward the outer layer after punching is urgently needed to be solved by those skilled in the art.

[0006] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Utility Model Content

[0007] The embodiments of the present disclosure at least provide an aluminum-plastic film that is punched without curling.

[0008] The embodiment of the present disclosure provides an aluminum-plastic film that is punched without curling, comprising: an outer layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer and a CPP film layer, wherein a PET film layer is arranged between the aluminum foil layer and the CPP film layer; wherein the outer layer and the aluminum foil layer are bonded by the first adhesive layer; the aluminum foil layer and the PET film layer are bonded by the second adhesive layer; and the PET film layer and the CPP film layer are bonded by the third adhesive layer.

[0009] In an optional embodiment, the thickness of the outer layer is 15 to 25 μm.

[0010] In an optional embodiment, the outer layer includes: a nylon film layer or a polyester film layer.

[0011] In an optional embodiment, the thickness of the aluminum foil layer is 44-55 μm.

[0012] In an optional embodiment, the thickness of the PET film layer is 6 to 12 μm.

[0013] In an optional embodiment, the thickness of the CPP film layer is 30 to 45 μm.

[0014] In an optional embodiment, the thickness of the first adhesive layer is 3 to 6 μm; the thickness of the second adhesive layer is 3 to 6 μm; and the thickness of the third adhesive layer is 3 to 6 μm.

[0015] In an optional embodiment, the first adhesive layer, the second adhesive layer and the third adhesive layer all include polyurethane glue.

[0016] The beneficial effect of the utility model is that the aluminum-plastic film that does not curl after the dents are punched is subjected to stress stretching, causing the shell to curl outward, and the PET film layer can effectively increase the tensile resistance, make the force distribution of the shell uniform, and improve the curling phenomenon of the dents.

[0017] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The objectives and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited herein and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of an aluminum-plastic film with punched holes and no curling provided in an embodiment of the present disclosure.

[0021] In the picture:

[0022] Outer layer 1, first adhesive layer 2, aluminum foil layer 3, second adhesive layer 4, PET film layer 5, third adhesive layer 6, CPP film layer 7. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0024] PET film: polyethylene terephthalate film.

[0025] CPP film: polypropylene film.

[0026] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, in the drawings, the thickness of components may be exaggerated or reduced in order to effectively describe the technical content.

[0027] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0028] like Figure 1 As shown, at least one embodiment provides an aluminum-plastic film that is punched without curling, comprising: an outer layer 1, a first adhesive layer 2, an aluminum foil layer 3, a second adhesive layer 4 and a CPP film layer 7, a PET film layer 5 is arranged between the aluminum foil layer 3 and the CPP film layer 7; wherein the outer layer 1 and the aluminum foil layer 3 are bonded by the first adhesive layer 2; the aluminum foil layer 3 and the PET film layer 5 are bonded by the second adhesive layer 4; and the PET film layer 5 and the CPP film layer 7 are bonded by the third adhesive layer 6.

[0029] Specifically, the aluminum-plastic film that does not curl after punching is composed of a seven-layer composite structure, which includes, from the outside to the inside, an outer layer 1, a first adhesive layer 2, an aluminum foil layer 3, a second adhesive layer 4, a PET film layer 5, a third adhesive layer 6 and a CPP film layer 7. After punching, the shell curls outward due to stress stretching, and the PET film layer 5 can effectively increase the tensile resistance, make the force distribution of the shell uniform, and improve the curling phenomenon after punching.

[0030] In some embodiments, the outer layer 1 plays a protective role and is composed of a nylon film layer or a polyester film layer; wherein the thickness of the outer layer 1 is 15 to 25 μm.

[0031] In some embodiments, the aluminum foil layer 3 serves to prevent external moisture from penetrating and internal electrolyte from overflowing; wherein, the thickness of the aluminum foil layer 3 is 44 to 55 μm.

[0032] In some embodiments, the PET film layer 5 plays a role in improving the curling of the aluminum-plastic film; wherein, the thickness of the PET film layer 5 is 6 to 12 μm.

[0033] In some embodiments, the CPP film layer 7 plays a decisive role in heat sealing the aluminum-plastic film, and heat sealing can form a battery shell; wherein, the thickness of the CPP film layer 7 is 30 to 45 μm.

[0034] In some embodiments, the thickness of the first adhesive layer 2 , the second adhesive layer 4 and the third adhesive layer 6 are all 3-6 μm, and are all made of polyurethane glue.

[0035] Optionally, the first adhesive layer 2 is made of polyurethane glue A, and the polyurethane glue A is a product produced by Suzhou Lithium Battery Adhesive Products Co., Ltd., with a model number of SG510.

[0036] Optionally, the second adhesive layer 4 is made of polyurethane glue B, and the polyurethane glue B is a product produced by Suzhou Lithium Battery Adhesive Products Co., Ltd., with a model number of LG880.

[0037] Optionally, the third adhesive layer 6 is made of polyurethane glue C, and the polyurethane glue C is a product produced by Suzhou Lithium Battery Adhesive Products Co., Ltd., with a model number of CG650.

[0038] The following is the data obtained from the specific test:

[0039] In the scenario where the PET film layer 5 is not set, the nylon film layer uses nylon with a thickness of 20μm, the first adhesive layer 2 has a coating thickness of 3μm, the aluminum foil layer 3 uses aluminum foil with a thickness of 40μm, the second adhesive layer 4 has a coating thickness of 6μm, and the CPP film layer 7 uses CPP with a thickness of 46μm; after punching, the maximum punching depth is 7.6mm, the maximum warping height is 35mm, and the overall curling height is 40°.

[0040] In the first application scenario of setting the PET film layer 5, optionally, the nylon film layer is made of nylon with a thickness of 20 μm, the first adhesive layer 2 is coated with a thickness of 3 μm, the aluminum foil layer 3 is made of aluminum foil with a thickness of 40 μm, the second adhesive layer 4 is coated with a thickness of 3 μm, the PET film layer 5 is made of PET with a thickness of 6 μm, the third adhesive layer 6 is coated with a thickness of 3 μm, and the CPP film layer 7 is made of CPP with a thickness of 40 μm; after punching, the maximum punching depth is 8.4 mm, the maximum warping height is 8 mm, and the overall curling height is 10°.

[0041] In the second application scenario of setting the PET film layer 5, optionally, the nylon film layer is made of nylon with a thickness of 15 μm, the first adhesive layer 2 is coated with a thickness of 3 μm, the aluminum foil layer 3 is made of aluminum foil with a thickness of 45 μm, the second adhesive layer 4 is coated with a thickness of 3 μm, the PET film layer 5 is made of PET with a thickness of 12 μm, the third adhesive layer 6 is coated with a thickness of 3 μm, and the CPP film layer 7 is made of CPP with a thickness of 34 μm; after punching, the maximum punching depth is 8.4 mm, the maximum warping height is 5 mm, and the overall curling height is 5°.

[0042] In the third application scenario of setting the PET film layer 5, the optional nylon film layer is 25μm thick nylon, the first adhesive layer 2 is 3μm thick, the aluminum foil layer 3 is 40μm thick aluminum foil, the second adhesive layer 4 is 3μm thick, the PET film layer 5 is 6μm thick PET, the third adhesive layer 6 is 3μm thick, and the CPP film layer 7 is 35μm thick CPP; after punching, the maximum punching depth is 8.2mm, the maximum warping height is 7mm, and the overall curling height is 10°.

[0043] In the fourth application scenario of setting the PET film layer 5, optionally, the nylon film layer is made of nylon with a thickness of 15 μm, the first adhesive layer 2 is coated with a thickness of 3 μm, the aluminum foil layer 3 is made of aluminum foil with a thickness of 55 μm, the second adhesive layer 4 is coated with a thickness of 3 μm, the PET film layer 5 is made of PET with a thickness of 6 μm, the third adhesive layer 6 is coated with a thickness of 3 μm, and the CPP film layer 7 is made of CPP with a thickness of 30 μm; after punching, the maximum punching depth is 8.8 mm, the maximum warping height is 8 mm, and the overall curling height is 9°.

[0044] Among them, when using the data from the second application scenario, the aluminum-plastic film has the best comprehensive performance.

[0045] In summary, after punching, the aluminum-plastic film that does not curl due to the dents is stretched under stress, causing the shell to curl outward, and the PET film layer 5 can effectively increase the tensile resistance, make the force distribution of the shell uniform, and improve the curling phenomenon after punching.

[0046] Herein, when it is mentioned that a first component is located on a second component, this may mean that the first component may be directly formed on the second component or a third component may be interposed between the first component and the second component.

[0047] As used herein, when an element or layer is referred to as being "located on," "engaged to," "connected to," "attached to," or "coupled to" another element or layer, it may be directly located on, engaged, connected, attached to, or coupled to the other element or layer, or there may be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly engaged to," "directly connected to," "directly attached to," or "directly coupled to" another element or layer, there may be no intervening elements or layers. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0048] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." when following a list of elements modify the entire list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0049] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an" and "the" may also be intended to include plural forms, unless otherwise clearly indicated herein. The terms "comprise", "include" and "have" are inclusive and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the particular order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0050] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0051] In the description of the embodiments of the present invention, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0052] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used herein unless expressly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0053] Spatially relative terms, such as "inside," "outside," "below," "beneath," "down," "above," "on," etc., may be used herein to describe the relationship of one element or feature to another element or feature as illustrated in the figures. In addition to the orientations depicted in the figures, spatially relative terms may be intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as being "below" or "below" other elements or features will be oriented to be "above" the other elements or features. Thus, the example term "below" may encompass both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0054] In the above discussion, unless otherwise indicated, the terms "about," "approximately," "substantially," etc., when used to describe a numerical value, mean a variation of + / - 10% of the value.

[0055] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. An aluminum-plastic film with a punched hole and no curling, comprising: An outer layer (1), a first adhesive layer (2), an aluminum foil layer (3), a second adhesive layer (4) and a CPP film layer (7), characterized in that a PET film layer (5) is provided between the aluminum foil layer (3) and the CPP film layer (7); wherein The outer layer (1) and the aluminum foil layer (3) are bonded together via a first adhesive layer (2); The aluminum foil layer (3) and the PET film layer (5) are bonded together via a second adhesive layer (4); The PET film layer (5) and the CPP film layer (7) are bonded together via a third adhesive layer (6).

2. The aluminum-plastic film with no curling after punching as claimed in claim 1, characterized in that: The thickness of the outer layer (1) is 15 to 25 μm.

3. The aluminum-plastic film with no curling after punching as claimed in claim 1, characterized in that: The outer layer (1) comprises: a nylon film layer or a polyester film layer.

4. The aluminum-plastic film with a punched hole and no curling according to claim 1, characterized in that: The thickness of the aluminum foil layer (3) is 44 to 55 μm.

5. The aluminum-plastic film with no curling after punching as claimed in claim 1, characterized in that: The thickness of the PET film layer (5) is 6 to 12 μm.

6. The aluminum-plastic film with no curling after punching as claimed in claim 1, characterized in that: The thickness of the CPP film layer (7) is 30 to 45 μm.

7. The aluminum-plastic film with no curling after punching as claimed in claim 1, characterized in that: The thickness of the first adhesive layer (2) is 3 to 6 μm; The thickness of the second adhesive layer (4) is 3 to 6 μm; The thickness of the third adhesive layer (6) is 3 to 6 μm.

8. The aluminum-plastic film with no curling after punching as claimed in claim 7, characterized in that: The first adhesive layer (2), the second adhesive layer (4) and the third adhesive layer (6) all comprise polyurethane glue.

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