A gold-plastic composite film for battery outer packaging, secondary battery

Abstract

The application relates to the field of battery outer packaging, in particular to a gold-plastic composite film for battery outer packaging and a secondary battery. The gold-plastic composite film for battery outer packaging comprises an outer base resin layer, an intermediate metal layer, an inner adhesive layer and an inner hot melting resin layer which are sequentially stacked; wherein the outer base resin layer comprises resin; the dynamic thermal mechanical analysis spectrum of the resin has a first characteristic peak in the range of 60 DEG C to 120 DEG C, a second characteristic peak in the range of 0 DEG C to 50 DEG C and a third characteristic peak in the range of -30 DEG C to -90 DEG C; the peak height of the first characteristic peak is <0.5, the peak height of the second characteristic peak is <0.2, and the peak height of the third characteristic peak is <0.2. The application designs the molecule of the resin for preparing the outer base resin layer, the molecular chain movement temperature and the ratio of storage modulus and loss modulus, thereby obtaining an outer base resin layer with extremely high forming property; after the outer base resin layer is compounded into the gold-plastic composite film, the forming capacity is significantly improved, and the requirement of the soft package lithium battery on the high forming property of the outer packaging material can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery outer packaging, in particular to a gold-plastic composite film for battery outer packaging and a secondary battery. BACKGROUND

[0002] At present, lithium ion batteries are mainly divided into three categories according to the packaging shape: square, cylindrical and soft package. The soft package type shell adopts a gold-plastic composite film, which is a composite film material formed by bonding a metal foil and a resin film through a specific adhesive, so it has the characteristics of light weight and strong plasticity.

[0003] The gold-plastic composite film is composed of an outer base resin layer, a middle metal layer, an inner adhesive layer and an inner hot melting resin layer from outside to inside. As a lithium battery outer packaging material, the function of the outer base resin layer is to improve the formability, so the film used for the outer base resin layer must have certain strength and tensile properties. In order to meet this requirement, the film used for the outer base resin layer is stretched and oriented by double-stretching or blown film process. Because the film is stretched, the molecules and molecular chains will be aligned in the stretching direction, so the thermal motion performance and thermal motion law of the molecules and molecular chains will change compared with before stretching and orientation. The thermal motion performance and thermal motion law of the molecules and molecular chains of the film are very important in actual use, which is reflected in the formability of the lithium battery outer packaging material. Therefore, the design of the thermal motion performance of the outer base resin layer film material for soft package lithium battery outer packaging material is very important.

[0004] In the past, the influence of film thermal motion performance on formability was not usually concerned, and the film thermal motion performance was not usually confirmed and managed. The formability of the film was usually adjusted by controlling the stretching ratio during film production, and the control of the stretching ratio was reflected in the confirmation and management of the stress-strain curve (hereinafter referred to as SS curve test) of the outer base resin layer film on the lithium battery outer packaging material in actual application. However, the stretching ratio cannot be used as a representative index of formability, especially it cannot represent the formability of the material at different temperatures, speeds and pressures. The results of SS curve test are also limited by sample preparation, and the formability of the film, especially the formability of the material at different temperatures, speeds and pressures, cannot be accurately reflected.

[0005] The rupture of the gold-plastic composite film will occur when the deformation exceeds the deformation limit of the gold-plastic composite film, and the deformation limit depends on the outer base resin layer, the middle metal layer and the resin used to prepare the outer base resin layer. With the pursuit of energy density of soft package lithium battery, the forming depth of the gold-plastic composite film is also required to be improved, and the existing outer base resin layer material cannot meet the requirement of high formability of soft package lithium battery. SUMMARY

[0006] The present application aims to solve at least one of the technical problems in the related art. To this end, the present application provides a gold-plastic composite film for battery outer packaging, a secondary battery. The gold-plastic composite film for battery outer packaging includes an outer base material resin layer containing a resin, and by designing the molecule, the molecular chain movement temperature, and the ratio of storage modulus and loss modulus of the resin, an outer base material resin layer with extremely high formability is prepared. After the outer base material resin layer is compounded into a gold-plastic composite film, the formability is significantly improved, and the requirement of high formability of the outer packaging material for soft package lithium batteries can be met.

[0007] To this end, the present application provides a gold-plastic composite film for battery outer packaging, a secondary battery. The gold-plastic composite film for battery outer packaging includes an outer base material resin layer containing a resin, and by designing the molecule, the molecular chain movement temperature, and the ratio of storage modulus and loss modulus of the resin, an outer base material resin layer with extremely high formability is prepared. After the outer base material resin layer is compounded into a gold-plastic composite film, the formability is significantly improved, and the requirement of high formability of the outer packaging material for soft package lithium batteries can be met.

[0008] The outer base material resin layer includes a resin; the dynamic thermal mechanical analysis spectrum of the resin has a first characteristic peak in the range of 60-120℃, a second characteristic peak in the range of 0-50℃, and a third characteristic peak in the range of -30- -90℃.

[0009] The peak height of the first characteristic peak is <0.5, the peak height of the second characteristic peak is <0.2, and the peak height of the third characteristic peak is <0.2.

[0010] When the resin is subjected to dynamic thermal mechanical analysis, the analyzer sets a temperature change program, and the real-time temperature displayed by the analyzer is the current movement temperature of the resin molecule and molecular chain. The peak height of the characteristic peak can be considered as the ratio of storage modulus and loss modulus. By designing the molecule, the molecular chain movement temperature, and the ratio of storage modulus and loss modulus of the resin for preparing the outer base material resin layer, an outer base material resin layer with extremely high formability is prepared. After the outer base material resin layer is compounded into a gold-plastic composite film, the formability of the gold-plastic composite film can be significantly improved, thereby solving the problem of insufficient formability of soft package lithium batteries in the prior art.

[0011] According to an embodiment of the present application, the dynamic thermal mechanical analysis spectrum of the resin has a first characteristic peak in the range of 80-100℃.

[0012] According to an embodiment of the present application, the peak height of the first characteristic peak is <0.3, preferably <0.2.

[0013] According to an embodiment of the present application, the dynamic thermal mechanical analysis spectrum of the resin has a second characteristic peak in the range of 20-40℃.

[0014] According to an embodiment of the present application, the dynamic thermal mechanical analysis spectrum of the resin has a third characteristic peak in the range of -60--80℃.

[0015] According to an embodiment of the present application, the peak height of the third characteristic peak is <0.15.

[0016] According to an embodiment of the present application, the resin comprises a polyamide, and the polyamide comprises an aliphatic polyamide.

[0017] According to an embodiment of the present application, the aliphatic polyamide comprises at least one of nylon 6, nylon 66, nylon 610, nylon 12, and nylon 46.

[0018] According to an embodiment of the present application, the resin comprises a copolymer of nylon 6 and nylon 66.

[0019] According to an embodiment of the present application, the ratio of nylon 6 to nylon 66 in the copolymer of nylon 6 and nylon 66 is (100-1):(1-100).

[0020] The second aspect of the present application provides a secondary battery, which comprises the gold-plastic composite film for battery outer packaging.

[0021] The outer substrate resin layer provided by the present application has extremely high formability, and after being compounded into a gold-plastic composite film, the formability of the gold-plastic composite film is significantly improved, which can meet the requirements of soft-pack lithium batteries on high punching depth and improve the punching depth capability, especially the punching depth capability under different temperatures, speeds and pressures, thereby solving the problem of insufficient formability of soft-pack lithium batteries in the prior art.

[0022] The present application has the following beneficial effects compared with the prior art:

[0023] The present application provides an outer substrate resin layer, which is prepared by designing the molecules of the resin of the outer substrate resin layer, the molecular chain movement temperature, and the ratio of storage modulus and loss modulus, thereby obtaining an outer substrate resin layer with extremely high formability. After being compounded into a gold-plastic composite film, the formability of the gold-plastic composite film is significantly improved, which can meet the requirements of soft-pack lithium batteries on high formability of outer packaging materials, and has high industrial utilization value.

[0024] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0026] Figure 1 The structure of the gold-plastic composite film for battery outer packaging according to the present application is shown.

[0027] Reference Signs:

[0028] Outer base material resin layer 1, outer adhesive layer 2, intermediate metal layer 3, inner adhesive layer 4, inner hot melt resin layer 5. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below. The embodiments described below are exemplary only and are not intended to be limiting of the present application.

[0030] It should be noted that the terms "first", "second", and the like, do not denote any quantity or order but are used to distinguish one element from another, and are not necessarily used in a sequence. It should be further noted that the terms "comprises", "comprising", "includes", "including" and the like, are open-ended and are intended to mean that the elements listed thereafter can be included or comprised in the process, composition or method, but are not limited thereto.

[0031] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The endpoints of the ranges and any values are provided as approximate descriptions of the range and are accomplished by varying the values within the range. Each numerical value should be read and interpreted as "about" that value in light of the number of reported significant digits and the application's teaching. Any numerical value, however, can include the recited value plus or minus 10% of the recited value.

[0032] In order that the present application can be more readily understood, certain technical and scientific terms are specifically defined below. Unless specifically defined herein, all other technical and scientific terms used in this document connotate the meanings that are commonly understood by one of ordinary skill in the art in the field of the application.

[0033] In this document, the terms "comprises", "comprising", "includes", "including" or "has", "having" etc. are to be construed as open-ended terms, i.e. meaning "including, but not limited to", and thus should be interpreted to cover the terms as purely optional alternatives, such that any numbered list of items separately recited as "comprised of" or "comprising" or "including" or "having" one or more members would be construed as consisting of those numbered items individually, as well as any combination of those numbered items.

[0034] In this document, the terms "optionally", "optional", or "may" generally mean that the subsequently described event or circumstance can or can not occur or that the subsequently described event or circumstance is optional, and thus the description includes instances where the event or circumstance occurs and instances where it does not.

[0035] According to embodiments of the present application, a first aspect of the present application provides a gold-plastic composite film for battery outer packaging, the gold-plastic composite film for battery outer packaging comprising an outer base material resin layer, an intermediate metal layer, an inner adhesive layer, and an inner hot melt resin layer which are sequentially stacked.

[0036] The outer base material resin layer comprises resin, and the dynamic thermal mechanical analysis spectrum of the resin has a first characteristic peak in the range of 60-120 DEG C, a second characteristic peak in the range of 0-50 DEG C, and a third characteristic peak in the range of -30- -90 DEG C.

[0037] The peak height of the first characteristic peak is less than 0.5, the peak height of the second characteristic peak is less than 0.2, and the peak height of the third characteristic peak is less than 0.2.

[0038] The present application designs the molecule of the resin for preparing the outer base material resin layer, the molecular chain movement temperature, and the ratio of storage modulus and loss modulus, thereby preparing an outer base material resin layer with extremely high formability. After the outer base material resin layer is compounded into a gold-plastic composite film, the formability of the gold-plastic composite film can be significantly improved, thereby solving the problem of insufficient formability of soft package lithium batteries in the prior art.

[0039] According to a specific embodiment of the present application, the gold-plastic composite film for battery outer packaging further comprises an outer adhesive layer, which is located between the outer base material resin layer and the intermediate metal layer.

[0040] According to a specific embodiment of the present application, the dynamic thermal mechanical analysis spectrum of the resin has a first characteristic peak in the range of 80-100 DEG C.

[0041] According to a specific embodiment of the present application, the peak height of the first characteristic peak is less than 0.3, preferably less than 0.2, and as some specific examples, the peak height of the first characteristic peak can be 0.22, 0.18, 0.16, 0.15, 0.14, etc.

[0042] According to a specific embodiment of the present application, the dynamic thermal mechanical analysis spectrum of the resin has a second characteristic peak in the range of 20-40 DEG C.

[0043] According to a specific embodiment of the present application, the dynamic thermal mechanical analysis spectrum of the resin has a third characteristic peak in the range of -60- -80 DEG C.

[0044] According to a specific embodiment of the present application, the peak height of the third characteristic peak is less than 0.15, and as some specific examples, the peak height of the third characteristic peak can be 0.16, 0.12, 0.1, 0.09, 0.08, etc.

[0045] According to a specific embodiment of the present application, the resin comprises a polyamide, and the polyamide comprises an aliphatic polyamide, which is not particularly limited in kind, and as some specific examples, the aliphatic polyamide comprises at least one of nylon 6, nylon 66, nylon 610, nylon 12, and nylon 46.

[0046] According to a specific embodiment of the present application, the resin comprises a copolymer of nylon 6 and nylon 66.

[0047] According to a specific embodiment of the present application, the ratio of nylon 6 to nylon 66 in the copolymer of nylon 6 and nylon 66 is (100-1):(1-100), and as some specific examples, the ratio of nylon 6 to nylon 66 in the copolymer of nylon 6 and nylon 66 can be 100:1, 1:1, 1:100, etc.

[0048] According to an embodiment of the present application, the second aspect of the present application provides a secondary battery, which comprises the gold-plastic composite film for battery outer packaging according to the first aspect.

[0049] The outer substrate resin layer provided by the present application has very high formability, and after being compounded into a gold-plastic composite film, the formability of the gold-plastic composite film is significantly improved, which can meet the requirements of soft-pack lithium batteries on high punching depth and improve the punching depth capability, especially the punching depth capability under different temperatures, speeds and pressures, thereby solving the problem of insufficient formability of soft-pack lithium batteries in the prior art.

[0050] The solutions of the present application will be explained below in combination with embodiments. Those skilled in the art will understand that the following embodiments are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. If the specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in the art or according to the product instructions are used. If the reagents or instruments are not specified by the manufacturer, they are all conventional products that can be obtained by purchase.

[0051] Embodiment 1

[0052] The present embodiment provides a gold-plastic composite film for battery outer packaging, which has a structure from outside to inside comprising an outer substrate resin layer 1, an outer adhesive layer 2, an intermediate metal layer 3, an inner adhesive layer 4 and an inner hot melt adhesive layer 5, wherein the material of the outer substrate resin layer 1 comprises nylon 6, the dynamic mechanical analysis spectrum of the nylon 6 has a first characteristic peak in the range of 80℃-100℃, the peak height is <0.2; has a second characteristic peak in the range of 20℃-40℃, the peak height is <0.2; has a third characteristic peak in the range of -60℃- -80℃, the peak height is <0.15.

[0053] Embodiment 2

[0054] The embodiment provides a gold-plastic composite film for battery outer packaging, the structure of the gold-plastic composite film comprises from outside to inside: an outer base resin layer 1, an outer adhesive layer 2, an intermediate metal layer 3, an inner adhesive layer 4 and an inner hot melt resin layer 5, wherein the material of the outer base resin layer 1 comprises nylon 66, the dynamic mechanical analysis spectrum of the nylon 66 has a first characteristic peak in the range of 80-100 DEG C, the peak height is less than 0.2; the second characteristic peak in the range of 20-40 DEG C, the peak height is less than 0.2; the third characteristic peak in the range of -60- -80 DEG C, the peak height is less than 0.15.

[0055] Example 3

[0056] The embodiment provides a gold-plastic composite film for battery outer packaging, the structure of the gold-plastic composite film comprises from outside to inside: an outer base resin layer 1, an outer adhesive layer 2, an intermediate metal layer 3, an inner adhesive layer 4 and an inner hot melt resin layer 5, wherein the material of the outer base resin layer 1 comprises nylon 66, the dynamic mechanical analysis spectrum of the nylon 66 has a first characteristic peak in the range of 80-100 DEG C, the peak height is less than 0.2; the second characteristic peak in the range of 20-40 DEG C, the peak height is less than 0.2; the third characteristic peak in the range of -60- -80 DEG C, the peak height is less than 0.15.

[0057] Example 4

[0058] The embodiment provides a gold-plastic composite film for battery outer packaging, the structure of the gold-plastic composite film comprises from outside to inside: an outer base resin layer 1, an outer adhesive layer 2, an intermediate metal layer 3, an inner adhesive layer 4 and an inner hot melt resin layer 5, wherein the material of the outer base resin layer 1 comprises nylon 66, the dynamic mechanical analysis spectrum of the nylon 66 has a first characteristic peak in the range of 80-100 DEG C, the peak height is less than 0.2; the second characteristic peak in the range of 20-40 DEG C, the peak height is less than 0.2; the third characteristic peak in the range of -60- -80 DEG C, the peak height is less than 0.15.

[0059] Comparative Example 1

[0060] The comparative example provides a gold-plastic composite film for battery outer packaging, the structure of the gold-plastic composite film comprises from outside to inside: an outer base resin layer 1, an outer adhesive layer 2, an intermediate metal layer 3, an inner adhesive layer 4 and an inner hot melt resin layer 5, wherein the material of the outer base resin layer 1 comprises Polyester-based compounds, specifically polyethylene terephthalate, the dynamic mechanical analysis spectrum of the polyethylene terephthalate has a first characteristic peak in the range of 80-100℃, peak height >0.2; a second characteristic peak in the range of 20-40℃, peak height >0.2; a third characteristic peak in the range of -60--80℃, peak height >0.15.

[0061] Comparative Example 2

[0062] The present comparative example provides a gold-plastic composite film for battery outer packaging, the structure of the gold-plastic composite film from outside to inside includes: outer substrate resin layer 1, outer adhesive layer 2, intermediate metal layer 3, inner adhesive layer 4 and inner hot melt adhesive resin layer 5, wherein the material of the outer substrate resin layer 1 comprises a mixed resin of polyethylene terephthalate and nylon 6, the ratio of polyethylene terephthalate and nylon 6 in the mixed resin is 100:50, the dynamic mechanical analysis spectrum of the mixed resin has a first characteristic peak in the range of 80-100℃, peak height <0.2; a second characteristic peak in the range of 20-40℃, peak height >0.2; a third characteristic peak in the range of -60--80℃, peak height >0.15.

[0063] Comparative Example 3

[0064] The present comparative example provides a gold-plastic composite film for battery outer packaging, the structure of the gold-plastic composite film from outside to inside includes: outer substrate resin layer 1, outer adhesive layer 2, intermediate metal layer 3, inner adhesive layer 4 and inner hot melt adhesive resin layer 5, wherein the material of the outer substrate resin layer 1 comprises a mixed resin of polyethylene terephthalate and nylon 6, the ratio of polyethylene terephthalate and nylon 6 in the mixed resin is 50:100, the dynamic mechanical analysis spectrum of the mixed resin has a first characteristic peak in the range of 80-100℃, peak height >0.2; a second characteristic peak in the range of 20-40℃, peak height <0.2; a third characteristic peak in the range of -60--80℃, peak height >0.15.

[0065] For convenience of comparison, the temperature at which the characteristic peak appears in the dynamic mechanical analysis spectrum of the resin material of the outer substrate resin layer 1 in Examples 1-4 and Comparative Examples 1-3 and the corresponding peak height are listed in Table 1.

[0066] Table 1

[0067]

[0068] Test Example

[0069] The depth limit of the gold-plastic composite film for battery outer packaging provided by the examples and comparative examples is tested, and the test method is as follows:

[0070] (1) Punching limit test:

[0071] The test was performed using a molding machine with the following parameters:

[0072] Shell size: 57mm*98mm

[0073] R angle: 1.5

[0074] Pressure: 0.4Mpa

[0075] Pressurization time: 0.1s / 1s

[0076] Mold core residence: 1.5s

[0077] The gold-plastic composite film for battery outer packaging provided by Examples 1-4 and Comparative Examples 1-3 was tested according to the above-mentioned punching limit test method, and the test results are shown in Table 2.

[0078] Table 2

[0079]

[0080]

[0081] The test results of Comparative Example 1 show that when the material of the outer substrate resin layer 1 is a polyester compound, specifically polyethylene terephthalate, the dynamic mechanical analysis spectrum of the polyethylene terephthalate has a first characteristic peak in the range of 80℃-100℃, the peak height is >0.2; has a second characteristic peak in the range of 20℃-40℃, the peak height is >0.2; has a third characteristic peak in the range of -60℃- -80℃, the peak height is >0.15, at this time, the punching limit of the gold-plastic composite film under the condition of pressurization time of 1s is low, and the punching limit under the condition of pressurization time of 0.1s is also low.

[0082] The test results of Comparative Example 2 show that when the material of the outer substrate resin layer 1 is a mixed resin of polyethylene terephthalate and nylon 6 and the ratio of polyethylene terephthalate and nylon 6 in the mixed resin is (1-100):1, the dynamic mechanical analysis spectrum of the mixed resin has a first characteristic peak in the range of 80℃-100℃, the peak height is <0.2; has a second characteristic peak in the range of 20℃-40℃, the peak height is >0.2; has a third characteristic peak in the range of -60℃- -80℃, the peak height is >0.15, at this time, the punching limit of the gold-plastic composite film under the condition of pressurization time of 1s is low, and the punching limit under the condition of pressurization time of 0.1s is also low.

[0083] The test result of Comparative Example 3 shows that when the material of the outer substrate resin layer 1 is a mixed resin of polyethylene terephthalate and nylon 6 and the ratio of polyethylene terephthalate and nylon 6 in the mixed resin is 1:(1-100), the dynamic mechanical analysis spectrum of the mixed resin has a first characteristic peak in the range of 80-100℃, the peak height is >0.2; has a second characteristic peak in the range of 20-40℃, the peak height is <0.2; has a third characteristic peak in the range of -60--80℃, the peak height is >0.15, at this time, the limit of the punch depth of the gold-plastic composite film under the condition of 1s of the pressurization time is low, and the limit of the punch depth under the condition of 0.1s of the pressurization time is also low.

[0084] The test result of Examples 1-4 shows that when the material of the outer substrate resin layer 1 is polyamide or its copolymer, the dynamic mechanical analysis spectrum of the mixed resin has a first characteristic peak in the range of 80-100℃, the peak height is <0.2; has a second characteristic peak in the range of 20-40℃, the peak height is <0.2; has a third characteristic peak in the range of -60--80℃, the peak height is <0.15, at this time, the gold-plastic composite film shows excellent forming ability under the conditions of 0.1s and 1s of the pressurization time.

[0085] It can be known from the data of Examples 1-4 that the gold-plastic composite film for battery outer packaging provided by the present application shows excellent forming ability under the conditions of 0.1s and 1s of the pressurization time, effectively overcomes the limitation of high punch depth (especially the punch depth under high speed) of the soft-pack lithium battery in the prior art, and has high industrial utilization value.

[0086] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and modified by those skilled in the art without contradiction.

[0087] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A gold-plastic composite film for battery outer packaging, characterized in that, The battery outer packaging gold-plastic composite film includes an outer substrate resin layer, an intermediate metal layer, an inner adhesive layer and an inner heat-fusion resin layer stacked in sequence. The outer substrate resin layer comprises resin; the dynamic thermomechanical analysis spectrum of the resin has a first characteristic peak in the range of 60℃~120℃, a second characteristic peak in the range of 0℃~50℃, and a third characteristic peak in the range of -30℃~-90℃. The peak height of the first characteristic peak is <0.2, the peak height of the second characteristic peak is <0.2, and the peak height of the third characteristic peak is <0.15; wherein, the peak height of the characteristic peak is the ratio of the storage modulus of the resin to the loss modulus of the resin; The resin includes polyamide, and the polyamide includes aliphatic polyamide.

2. The gold-plastic composite film for battery outer packaging according to claim 1, characterized in that, The dynamic thermomechanical analysis spectrum of the resin exhibits a first characteristic peak in the range of 80℃ to 100℃.

3. The gold-plastic composite film for battery outer packaging according to claim 1, characterized in that, The dynamic thermomechanical analysis spectrum of the resin exhibits a second characteristic peak in the range of 20℃ to 40℃.

4. The gold-plastic composite film for battery outer packaging according to claim 1, characterized in that, The dynamic thermomechanical analysis spectrum of the resin exhibits a third characteristic peak in the range of -60℃ to -80℃.

5. The gold-plastic composite film for battery outer packaging according to claim 1, characterized in that, The aliphatic polyamide includes at least one of nylon 6, nylon 66, nylon 610, nylon 12, and nylon 46.

6. The gold-plastic composite film for battery outer packaging according to claim 5, characterized in that, The resin includes a copolymer of nylon 6 and nylon 66.

7. The gold-plastic composite film for battery outer packaging according to claim 6, characterized in that, The ratio of nylon 6 to nylon 66 in the copolymer of nylon 6 and nylon 66 is (100-1):(1-100).

8. A secondary battery, characterized in that, The secondary battery includes the gold-plastic composite film for battery packaging as described in any one of claims 1-7.

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