CN106848111B

CN106848111B - Stack film and manufacturing method thereof

Info

Publication number: CN106848111B
Application number: CN201610037068.6A
Authority: CN
Inventors: 邓伊玲; 王博生; 萧钲谚; 洪子景; 阮泓宪
Original assignee: Taiflex Scientific Co Ltd
Current assignee: Taiflex Scientific Co Ltd
Priority date: 2015-12-04
Filing date: 2016-01-20
Publication date: 2020-02-14
Anticipated expiration: 2036-01-20
Also published as: CN106848111A; TW201721955A; TWI603520B

Abstract

The invention provides a stack film layer and a manufacturing method thereof. The metal layer has a first surface and a second surface opposite to each other. The first resin layer is configured on the first surface of the metal film. The second resin layer is configured on the second surface of the metal film. The adhesion layer is configured on the second resin layer and is positioned between the metal film and the second resin layer. The invention has simplified process steps, and can accurately control the thickness of the film layer and the process yield.

Description

Stack film and manufacturing method thereof

Technical Field

The present invention relates to a film stack and a method for manufacturing the same, and more particularly, to a film stack used as a packaging material and a method for manufacturing the same.

Background

Lithium batteries are used as batteries for portable devices such as notebook personal computers (personal computers) and cellular phones, and for hybrid vehicles and electric vehicles. With the increasing market demand for lithium batteries with the features of light weight, high voltage, and high energy density for repeated charging and discharging, the demands for lithium batteries with such properties as light weight, durability, high voltage, high energy density, and high safety have become higher and higher.

Generally, an aluminum plastic film for packaging a lithium battery is a laminated structure, wherein the simplest laminated structure includes a nylon film 11, a first adhesive layer 12, a metal aluminum foil layer 13, a second adhesive layer 14 and a sealing layer 15 in sequence from top to bottom as shown in fig. 1. The nylon film 11 as the outer layer has improved puncture resistance and moldability, but the nylon film 11 is produced by a complicated process including the steps of forming a film from nylon plastic pellets by an extruder and then forming a biaxially stretched nylon film 11 by a biaxial stretcher. In addition, in order to provide good adhesion strength between the nylon film 11 and the metal aluminum foil layer 13, a glue layer is further applied to form the first adhesive layer 12 to adhere the nylon film 11 to the metal aluminum foil layer 13. In addition, the nylon film 11 has poor chemical resistance, and the electrolyte may cause whitening marks on the surface of the nylon film 11, thereby causing defective products having appearance defects, and further reducing the yield of finished products.

Therefore, how to improve the insufficient chemical resistance of the outer layer of the aluminum plastic film to meet the requirements of the industry at present is a problem that those skilled in the art are demanding to solve.

Disclosure of Invention

The invention provides a stack film layer and a manufacturing method thereof. The stacked film layer has novel structure, high puncture resistance, chemical resistance and formability. The manufacturing method of the stack film layer can simplify the manufacturing steps, has high manufacturing efficiency, and can improve the manufacturing yield when the aluminum plastic film is used on the lithium battery.

The invention provides a stacked film layer, which comprises a metal layer, a first resin layer, a second resin layer and an adhesion layer. The metal layer has a first surface and a second surface opposite to each other. The first resin layer is configured on the first surface of the metal film. The second resin layer is configured on the second surface of the metal film. The adhesion layer is configured on the second resin layer and is positioned between the metal film and the second resin layer.

In one embodiment of the present invention, the material of the metal layer includes an aluminum film.

In one embodiment of the present invention, the thickness of the metal layer is 25 to 40 μm.

In one embodiment of the present invention, wherein the material of the first resin layer comprises polyvinyl butyral.

In one embodiment of the present invention, the thickness of the first resin layer is 5 to 30 μm.

In one embodiment of the present invention, the material of the second resin layer comprises polypropylene.

In one embodiment of the present invention, the thickness of the second resin layer is 30 to 80 μm.

In one embodiment of the present invention, the material of the adhesive layer comprises acid modified polyolefin or acid modified polypropylene.

In one embodiment of the present invention, the thickness of the adhesive layer is 3 to 15 μm.

The invention relates to a method for manufacturing a stack film, which comprises the following steps: providing a metal layer and a second resin layer, wherein the metal layer is provided with a first surface and a second surface which are opposite to each other; then, forming an adhesion layer between the second resin layer and the metal layer to make the second resin layer adhere to the second surface of the metal layer; finally, a first resin layer is formed on the first surface of the metal layer.

In an embodiment of the invention, the step of attaching the second resin layer to the second surface of the metal layer includes coating the adhesive layer on the second surface of the metal layer by a coating process, and attaching the adhesive layer to the second resin layer opposite to the surface of the metal layer to attach the second resin layer to the metal layer.

In an embodiment of the invention, the step of attaching the second resin layer to the second surface of the metal layer includes coating the adhesive layer on the second resin layer by a coating process, and attaching the adhesive layer to the second surface of the metal layer opposite to the surface of the second resin layer to attach the second resin layer to the metal layer.

In an embodiment of the present invention, the step of attaching the second resin layer to the second surface of the metal layer includes forming an adhesive layer on the second surface of the metal layer by a laminating process; the surface of the adhesion layer corresponding to the metal layer is placed on the second resin layer, and the second resin layer is bonded on the metal layer through a hot pressing process.

Based on the above, since the first resin layer in the stack structure of the present invention is disposed on the first surface of the metal film, the stack structure of the present invention has high puncture resistance, chemical resistance and moldability, in addition to having good adhesion between the first resin layer and the metal layer. In addition, based on the structure of the stack structure, the manufacturing method of the stack film layer has simplified manufacturing steps and can accurately control the thickness of the film layer and the manufacturing yield.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic cross-sectional view of a laminate of a known battery packaging material;

FIG. 2 is a schematic cross-sectional view of stacked layers according to one embodiment of the present invention;

fig. 3A to 3C are schematic cross-sectional views illustrating a process of fabricating a stacked film according to an embodiment of the invention.

Reference numerals:

11: nylon membrane

12: a first adhesive layer

13: metal aluminium foil layer

14: the second adhesive layer

15: sealing layer

110: metal layer

110 a: first surface

110 b: second surface

120: a first resin layer

130: adhesive layer

140: second resin layer

Detailed Description

In this context, a range denoted by "a numerical value to another numerical value" is a general expression avoiding a recitation of all numerical values in the range in the specification. Thus, recitation of a range of values herein is intended to encompass any value within the range and any smaller range defined by any value within the range, as if the range and smaller range were explicitly recited in the specification.

FIG. 2 is a schematic cross-sectional view of stacked layers according to one embodiment of the invention. Referring to fig. 2, a stacked film according to the present invention includes a metal layer 110, a first resin layer 120, an adhesion layer 130, and a second resin layer 140. In the present embodiment, the foregoing film layers will be described in detail below, taking as an example an aluminum plastic film in which a stack film layer is applied to a battery packaging material.

The metal layer 110 has a first surface 110a and a second surface 110b opposite to each other. In the present embodiment, the material of the metal layer 110 includes an aluminum film (aluminum film), which has the function of preventing moisture and blocking. In one embodiment, the thickness of the metal layer 110 is, for example, 25 to 40 microns. For example, in the following embodiments, the thickness of the metal layer 110 is, for example, 40 μm, but the invention is not limited thereto.

The first resin layer 120 is used as an outer layer of the stacked film and disposed on the first surface 110a of the metal layer 110. In addition, the first resin layer 120 is in direct contact with the first surface 110a of the metal layer 110, and functions as a protective film of the stacked film layers, so as to maintain the high puncture resistance of the aluminum plastic film and the formability of the battery, and further impart the aluminum plastic film with the characteristic of high chemical resistance. In the present embodiment, the material of the first resin layer 120 includes, for example, polyvinyl butyral (PVB). In one embodiment, the thickness of the first resin layer 120 is, for example, 5 to 30 micrometers.

The second resin layer 140 is disposed on the second surface 110b of the metal film 110 as an inner layer of the stacked film. The second resin layer 140 serves as an isolation layer for covering the battery core and isolating the metal layer 110 from the battery core. In the present embodiment, the material of the second resin layer 140 includes polypropylene (PP), for example. In one embodiment, the thickness of the second resin layer 140 is, for example, 30 to 80 micrometers, which is not limited in the invention.

The adhesive layer 130 is disposed on the second resin layer 140 and located between the metal film 110 and the second resin layer 140. In the present embodiment, the material of the adhesive layer 130 includes acid-modified polyolefin (mPO) or acid-modified polypropylene (mPP), for example. In one embodiment, the thickness of the adhesive layer 130 is, for example, 3 to 15 microns.

Hereinafter, a method for fabricating the stacked film will be described in detail. Fig. 3A to 3C are schematic cross-sectional views illustrating a process of fabricating a stacked film according to an embodiment of the invention.

First, referring to fig. 3A, a metal layer 110 is provided, wherein the metal layer 110 has a first surface 110a and a second surface 110b opposite to each other. In this embodiment, the material of the metal layer 110 includes an aluminum film. In one embodiment, the thickness of the metal layer 110 is, for example, 25 to 40 micrometers, which is not limited in the invention.

Next, an adhesive layer 130 is formed between the second resin layer 140 and the metal layer 110, so that the second resin layer 140 is attached to the second surface 110B of the metal layer 110, as shown in fig. 3B. For example, the material of the adhesion layer 130 is acid modified polyolefin or acid modified polypropylene. In one embodiment, the thickness of the adhesive layer 130 is, for example, 3 to 15 micrometers, which is not limited in the invention. In one embodiment, the material of the second resin layer 140 includes polypropylene, for example, and the thickness of the second resin layer 140 is 30 micrometers to 80 micrometers, for example, which is not limited in the invention.

Specifically, in one embodiment, when the material of the adhesive layer 130 is, for example, acid-modified polyolefin, the acid-modified polyolefin is coated on the second surface 110b of the metal layer 110 by a coating process to form the adhesive layer 130, and the adhesive layer 130 is directly placed on the second resin layer 140 opposite to the surface of the metal layer 110, so that the second resin layer 140 is attached to the metal layer 110. In another embodiment, when the material of the adhesive layer 130 is, for example, acid-modified polyolefin, the adhesive layer 130 is coated on the second resin layer 140 by a coating process to form the adhesive layer 130, and the surface of the adhesive layer 130 opposite to the second resin layer 140 is directly placed on the second surface 110b of the metal layer 110, so that the second resin layer 140 is attached to the metal layer 110. In addition, in another embodiment, when the material of the adhesive layer 130 is, for example, acid-modified polypropylene, the acid-modified polypropylene is coated on the second surface 110b of the metal layer 110 by a laminating process to form the adhesive layer 130, and then the adhesive layer 130 is directly placed on the second resin layer 140 opposite to the surface of the metal layer 110, and the second resin layer 140 is bonded to the metal layer 110 by a thermal compression process after the temperature and pressure are raised. The coating process includes roll coating (rolcoating), blade coating (blade coating), slide coating (slide coating), slot-die coating, or wire-bar coating.

Finally, a first resin layer 120 is formed on the first surface 110a of the metal layer 110, as shown in fig. 3C. Specifically, the first resin layer 120 is coated on the first surface 110a of the metal layer 110 by a coating process, and is completely cured by a thermosetting method (thermal curing) to form a film on the first surface 110a of the metal layer 110. In detail, the coating process includes roll coating, knife coating, slide coating, extrusion coating, or wire bar coating. In the present embodiment, the material of the first resin layer 120 includes, for example, polyvinyl butyral. In one embodiment, the thickness of the first resin layer 120 is, for example, 5 to 30 micrometers, which is not limited in the invention. Thus, the present invention has been completed. In addition, the above-mentioned manufacturing method is to form the second resin layer 140 first and then form the first resin layer 120, but the invention is not limited thereto; in yet other embodiments, the first resin layer 120 may be formed first, and then the second resin layer 140 may be formed.

It should be noted that the material of the first resin layer 120 of the present invention includes polyvinyl butyral, which is a cross-linked resin, and has characteristics of high puncture resistance, high moldability, and high chemical resistance. In addition, the first resin layer 120 and the metal layer 110 have good adhesion strength. The manufacturing process of the first resin layer 120 can be performed by a thermosetting method only through a single coating process step, so that the thickness of the film can be effectively controlled, and the additional adhesive material requirement (i.e., no adhesive layer is provided between the first resin layer 120 and the metal layer 110) can be saved, thereby ensuring the coating precision and the process yield. Since the main structure of the first resin layer 120 is a cross-linked resin, the use of the first resin layer 120 is not limited by the process of the second resin layer 140 (i.e., the second resin layer 140 is formed by directly bonding the adhesive layer 130 to the second surface 110b of the metal layer 110 or by thermally pressing the adhesive layer 130 to the second surface 110b of the metal layer 110).

Examples 1 to 4 and comparative examples 1 to 2 comprising the stacked film layer of the present invention are described below.

< example >

Please refer to the structure and the manufacturing method of the stacked film. The features of the present invention will be described more specifically below with reference to examples 1 to 4. Although the following examples 1 to 4 are described, the materials used, the film thickness, the process details, the process flow, and the like may be appropriately changed without departing from the scope of the present invention. Therefore, the present invention should not be construed restrictively by the examples described below.

Example 1

An acid-modified polyolefin (mPO) was applied to an aluminum film (aluminum film) having a film thickness of about 40 μm using a knife coating method at room temperature. Then, the surface of the aluminum layer having the acid-modified polyolefin is placed on a polypropylene (PP) film as an inner layer and attached, so that the polypropylene film is attached to the aluminum film by the acid-modified polyolefin, wherein the acid-modified polyolefin as an adhesive layer has a film thickness of about 3 to 5 micrometers and the polypropylene film has a film thickness of about 40 micrometers. Next, a resin layer having polyvinyl butyral (PVB) was directly coated on the other surface of the aluminum film using a knife coating method, and dried to form a film using a thermosetting method, so as to form an outer layer having a film thickness of 25 μm. The above steps are performed to complete the stacked film layer of the present invention.

Example 2

The stacked film layer of example 2 was prepared in the same procedure as in example 1. The difference lies in that: the outer layer film thickness was varied (as shown in table 1), with example 2 having an outer layer film thickness of 15 microns.

Example 3

An acid-modified polypropylene (mPP) was disposed to an aluminum film having a film thickness of about 40 μm using a film-coating process at room temperature. Then, the surface of the aluminum layer with the acid-modified polypropylene is placed on the polypropylene film as the inner layer, the temperature is raised to 150 ℃ and the pressure is raised to 5 kilogramme-force (kgf), the polypropylene film is attached to the aluminum film by the acid-modified polypropylene in a hot pressing manner, wherein the film thickness of the acid-modified polypropylene as the adhesion layer is about 10 to 15 micrometers, and the polypropylene film has a film thickness of about 30 to 35 micrometers. Next, the resin layer having PVB was directly coated on the other surface of the aluminum film using a knife coating method, and dried to form a film using a thermosetting method, so as to form an outer layer having a film thickness of 25 μm. The above steps are performed to complete the stacked film layer of the present invention.

Example 4

The stacked film layer of example 4 was prepared in the same procedure as in example 3. The difference lies in that: the film thickness of the outer layer was varied (as shown in table 1), with the film thickness of the outer layer of example 4 being 15 microns.

< comparative example >

The structure of the stacked film layers of comparative examples 1 to 2 can refer to the stacked structure of fig. 1, which includes a nylon film 11 as an outer layer, a first adhesive layer 12, a metal aluminum foil layer 13, a second adhesive layer 14, and a sealing layer 15 as an inner layer.

The manufacturing method of the stacked film layers of comparative examples 1 to 2 is the same as or similar to the manufacturing method of the conventional aluminum plastic film; briefly, after the nylon plastic particles are subjected to film forming by an extruding machine, a biaxial stretching machine is used for forming a biaxial stretching nylon film 11; a nylon layer 11 as an outer layer is bonded to a metal aluminum foil layer 13 through a first adhesive layer 12; and a sealing layer 15 as an inner layer is bonded to the other surface of the metal aluminum foil layer 13 via a second adhesive layer 14. Accordingly, the metal aluminum foil layer 13 is located between the nylon film 11 and the sealing layer 15.

In contrast, the difference between the stacked film of the present invention and the stacked film of comparative examples 1 to 2 is: in the stacked film of the present invention, the outer layer (e.g., the first resin layer 120) of the present invention is directly bonded to the metal layer 110.

Comparative example 1

The stacked film layer of comparative example 1 was Showa 113um (product name) and was manufactured by Showa corporation in japan, wherein the stacked film layer of comparative example 1 was prepared in a similar procedure to that of example 1. The difference lies in that: an additional first adhesive layer was provided between the outer layer and the metallic aluminum foil layer of comparative example 1. Therefore, please refer to the preparation steps of example 1 for the bonding process between the inner layer and the metal aluminum foil layer in comparative example 1, which will not be described herein again. The bonding process between the outer layer and the metal aluminum foil layer in comparative example 1 is described below.

At room temperature, the modified acrylic resin is coated on the surface of the metal aluminum foil layer with the film thickness of about 40 microns, and then the surface of the metal aluminum foil layer with the modified acrylic resin is attached to the nylon film with the film thickness of about 25 microns, so that the nylon film is attached to the metal aluminum foil layer through a first adhesion layer formed by the modified acrylic resin. The film thickness of the first adhesion layer is 3 micrometers to 5 micrometers. Accordingly, the stacked film layer of comparative example 1 was completed.

Comparative example 2

The film stack of comparative example 2 was DNP D-EL40H (product name) manufactured by japan printing company, wherein the film stack of comparative example 2 was prepared by a procedure similar to that of example 3. The difference lies in that: comparative example 2 has an additional first adhesive layer between the outer layer and the metallic aluminum foil layer. Therefore, please refer to the preparation steps of embodiment 3 for the bonding process between the inner layer and the metal aluminum foil layer in comparative example 2, which will not be described herein again. The bonding process between the outer layer and the metal aluminum foil layer in comparative example 2 is described below.

At room temperature, the modified acrylic resin is coated on the surface of the metal aluminum foil layer with the film thickness of about 40 microns, and then the surface of the metal aluminum foil layer with the modified acrylic resin is attached to the nylon film with the film thickness of about 25 microns, so that the nylon film is attached to the metal aluminum foil layer through a first adhesion layer formed by the modified acrylic resin. The film thickness of the first adhesion layer is 3 micrometers to 5 micrometers. Accordingly, the stacked film layer of comparative example 2 was completed.

PVB: polyvinyl butyral (polyvinyl butyl butyral)

mPO: acid-modified polyolefin (acid-modified polyolefin)

mPP: acid-modified polypropylene (acid-modified polypropylene)

PP: polypropylene (polypropylene)

A: product name Showa 113um, manufactured by Showa Co Ltd

B: product name DNP D-EL40H, manufactured by Dainippon printing Co

< measurement of peeling Strength >

First, the stacked film layers of examples 1 to 4 and comparative examples 1 to 2 were cut into test samples having a width of 15mm, and then, the peel strength test of an angle of 180 degrees was performed on the outer layer (i.e., the resin layer having PVB in the present invention/the nylon layer in the comparative example) and the metal layer of each test sample at a peel speed of 50mm/min using a universal tester (manufactured by SHIMADZU corporation, under the equipment name AG-1S), and the test samples were stretched to a tensile elongation of 50mm, wherein the tensile length was an intermediate value of 6 test samples, it is noted that in the standards set in the industry, the peel strength of the outer layer was at least greater than 4N/15mm, and therefore, the peel strength of the outer layer was greater than 4N/15mm, and "○" was described in table 2, and "x" was described in table 2 if the peel strength of the outer layer was less than or equal to 4N/15 mm.

Determination of puncture resistance

First, the stacked film layers of examples 1 to 4 and comparative examples 1 to 2 were fabricated into test samples having a length and width dimension of 10cm × 10cm, respectively. Then, a puncture test was performed using an intelligent electronic tensile tester (manufactured by Labthin) at a puncture speed of 50mm/min with a needle having a diameter of 2.03mm for the outer layer of each test sample at a needle R angle (Φ) of 0.5 degrees, and the puncture strength (N) at this time was determined, see table 2. It is worth mentioning that the greater the puncture strength of the outer layer, the less susceptible the outer layer is to be damaged by external force. That is, the outer layer has a strong puncture resistance.

Determination of depth of penetration

First, the stacked film layers of examples 1 to 4 and comparative examples 1 to 2 were each prepared as a test sample having a length and width of 8cm × 10cm, and then, each test sample was subjected to a cold punch test at a pressure of 6 kg, the test samples were punched out to a depth of more than 4mm, and after the cold punch test, the test samples were observed for the presence of a phenomenon such as a hole or delamination, and if no hole or delamination occurred, ○ was described in table 2, and if hole or delamination occurred, x was described in table 2.

Measurement of Heat resistance

First, the stacked film layers of examples 1 to 4 and comparative examples 1 to 2 were each prepared as a test sample having a length and width of 3cm × 15cm, and then, each test sample was subjected to a hot press test at a temperature of 220 ℃ and a pressure of 0.3MPa for 3 seconds, and after the hot press test, whether or not the outer layer of the test sample was broken was observed, and if the outer layer was not broken, "○" was described in table 2, and if the outer layer was broken, "x" was described in table 2.

Determination of solvent resistance

First, the stacked film layers of examples 1 to 4 and comparative examples 1 to 2 were each formed into a test specimen having a length and width of 10cm × 10cm, and then, the outer layer of each test specimen was wiped with ethyl ketone (MEK) and left for 1 minute, and after 1 minute, it was observed whether the outer layer of the test specimen was damaged (for example, the surface of the outer layer was corroded), and if the outer layer was not damaged, "○" was described in table 2, and if the outer layer was damaged, "×" was described in table 2.

Determination of electrolyte resistance

First, the stacked film layers of examples 1 to 4 and comparative examples 1 to 2 were fabricated into test samples having a length and width dimension of 10cm × 10cm, respectively. Next, an electrolyte (DEC/EMC/EC 1/1/1 (wt%) + LiPF was used₆) The outer layer of each test specimen was wiped off and left for 1 minute after 1 minute, the test specimens were observed for whether the outer layer was damaged (for example, the surface of the outer layer was corroded), and if the outer layer was not damaged, "○" was recorded in Table 2, if the outer layer was damagedWhen the sample was destroyed, "×" is shown in Table 2.

TABLE 2

As can be seen from table 2, the stacked film layers of examples 1-4 also maintained good performance in peel strength test, depth punch test, heat resistance test, and solution resistance test, compared to comparative examples 1-2, which indicates that the stacked film layers of examples 1-4 have good adhesion strength and moldability. In addition, it can be seen from table 2 that the stacked film layers of examples 1-4 indeed performed better in the puncture resistance test and the electrolyte resistance test than those of comparative examples 1-2, which indicates that the stacked film layers of examples 1-4 have good puncture resistance and chemical resistance.

In summary, since the first resin layer in the stack structure of the invention is disposed on the first surface of the metal film, the first resin layer and the metal layer have good adhesion; and the first resin layer can be used as an outer protective film of the metal layer, so that the stack structure has high puncture resistance, chemical resistance and formability. In addition, because the stack structure of the invention is different from the existing stack structure, compared with the existing manufacturing method of the stack structure, the manufacturing method of the stack film layer of the invention has simpler manufacturing steps, only needs a single coating processing step, can utilize the thermosetting method to carry out the drying film forming of the outer layer, can effectively control the film thickness, can save the extra glue material requirement (namely, the adhesive layer is not arranged between the first resin layer and the metal layer), and further ensure the precision of the coating processing and the process yield.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A stacked film, comprising:

a metal layer having a first surface and a second surface opposite to each other;

a first resin layer disposed on the first surface of the metal film, a material of the first resin layer including polyvinyl butyral;

a second resin layer disposed on the second surface of the metal film; and

and the adhesion layer is arranged on the second resin layer and is positioned between the metal film and the second resin layer.

2. The stacked film layer of claim 1, wherein the material of the metal layer comprises an aluminum film.

3. The stacked film layer of claim 1, wherein the metal layer has a thickness of 25 to 40 microns.

4. The stacked film layer of claim 1, wherein the first resin layer has a thickness of 5 to 30 microns.

5. The stacked film layer of claim 1, wherein the material of the second resin layer comprises polypropylene.

6. The stacked film layer of claim 1, wherein the thickness of the second resin layer is 30 to 80 microns.

7. The stacked film layer of claim 1, wherein the material of the adhesion layer comprises an acid modified polyolefin or an acid modified polypropylene.

8. The stacked film layers of claim 1 wherein the adhesion layer has a thickness of 3 to 15 microns.

9. A method for fabricating a stacked film, comprising:

providing a metal layer and a second resin layer, wherein the metal layer is provided with a first surface and a second surface which are opposite to each other;

forming an adhesive layer between the second resin layer and the metal layer to adhere the second resin layer to the second surface of the metal layer; and

and forming a first resin layer on the first surface of the metal layer, wherein the material of the first resin layer comprises polyvinyl butyral.

10. The method of claim 9, wherein the step of bonding the second resin layer to the second surface of the metal layer comprises:

coating the adhesive layer on the second surface of the metal layer by a coating process; and

and adhering the surface of the adhesion layer, which is opposite to the metal layer, to the second resin layer so as to adhere the second resin layer to the metal layer.

11. The method of claim 9, wherein the step of bonding the second resin layer to the second surface of the metal layer comprises:

coating the adhesive layer on the second resin layer by a coating process; and

and attaching the surface of the adhesive layer, which is opposite to the second resin layer, to the second surface of the metal layer, so that the second resin layer is attached to the metal layer.

12. The method of claim 9, wherein the step of bonding the second resin layer to the second surface of the metal layer comprises:

forming the adhesion layer on the second surface of the metal layer by a film coating process;

placing the adhesive layer on the second resin layer relative to the surface of the metal layer; and

and adhering the second resin layer to the metal layer by a hot pressing process.