CN210200765U

CN210200765U - Colored aluminum plastic film

Info

Publication number: CN210200765U
Application number: CN201920918743.5U
Authority: CN
Inventors: Taijun Wang; 王泰钧; Zhongwei Lei; 雷中伟; Chuxuan Zhang; 张楚萱; Xufeng Xia; 夏旭峰; Jianfei Sun; 孙剑飞
Original assignee: Zhejiang Huazheng Energy Materials Co Ltd
Current assignee: Zhejiang Huazheng Energy Materials Co Ltd
Priority date: 2019-06-18
Filing date: 2019-06-18
Publication date: 2020-03-27
Anticipated expiration: 2029-06-18

Abstract

The utility model relates to a colored aluminum-plastic film, which comprises a cast polypropylene film layer, an aluminum foil layer and an outer protective layer which are arranged in sequence; a first bonding layer is coated between the aluminum foil layer and the cast polypropylene film layer; a second bonding layer is coated between the aluminum foil layer and the outer protection layer; the cast polypropylene film layer, the aluminum foil layer and the nylon layer are compounded by heating and pressurizing; the second adhesive layer is a colored protective layer; the second bonding layer of the utility model is a colored aluminum plastic film of the colored bonding layer, which effectively prevents the slipping agent from separating out in the high-temperature processing process of the aluminum plastic film, increases the slip degree of the surface of the aluminum plastic film and is beneficial to the deep punching forming performance of the aluminum plastic film; in the use process after the cell is manufactured by processing and forming the aluminum-plastic film, the colored bonding layer effectively prevents water vapor from permeating, and the humidity and heat resistance of the aluminum-plastic film are improved. Meanwhile, the common black aluminum plastic film has the disadvantages of complicated processing technology, higher cost and poor actual utility, while the colored aluminum plastic film has the advantages of simple and convenient technology, lower cost and obvious actual utility.

Description

Colored aluminum plastic film

Technical Field

The utility model belongs to the technical field of soft packet of lithium ion battery, concretely relates to coloured plastic-aluminum membrane.

Background

Lithium batteries are widely used in the 3C and electronic fields with high energy density and excellent stability. With the development of science and technology, the external packaging material of the lithium battery is changed from a hard steel shell with poor stability to a soft aluminum-plastic composite film with lighter weight and more environmental protection. The aluminum-plastic film has excellent ductility, barrier property, puncture resistance and humidity resistance, and when the battery core in the soft package generates a gas expansion phenomenon in the use process, the aluminum-plastic film can generate enough buffer space for gas due to the excellent ductility, so that the battery explosion is effectively prevented. The aluminum-plastic film is generally formed by stacking five layers, including a cast polypropylene film layer (heat seal layer), a first adhesive layer, an aluminum foil layer, a second adhesive layer, a polyethylene terephthalate layer or a nylon layer (protective layer).

Aluminum plastic films have many advantages in lithium ion battery packaging, but have many disadvantages in the production and use processes:

firstly, the temperature requirement of the aluminum plastic film is higher in the processing process, and the slipping agent in the nylon layer and the cast polypropylene film layer is separated out at a high temperature, so that the surface slipping degree of a processed finished product is reduced, and the friction coefficient is increased. The surface smoothness of the aluminum-plastic film can influence the punch forming performance of the aluminum-plastic film, and poor smoothness can cause lower punch forming depth of the aluminum-plastic film and reduction of yield in a severe punch environment.

Secondly, after the aluminum-plastic film is processed into the battery cell, the battery cell is in a high-temperature high-humidity state for a long time in the actual use process. The requirements of high-temperature and high-humidity environment on the barrier property of the outer layer material of the aluminum-plastic film are very strict, the outer layer material of the aluminum-plastic film with poor barrier property and poor water vapor permeability is easy to bubble, delaminate and shrink, and meanwhile, moisture in the environment can permeate into the battery core to cause safety accidents.

Thirdly, black carbon black is mixed into the outer-layer adhesive to form a black bonding layer in the outer-layer structure of the black aluminum-plastic film on the market at present.

The test result shows that after the carbon black is added into the outer layer adhesive, the properties of the aluminum-plastic film, such as deep drawing forming property, humidity and heat resistance, outer layer peeling strength and the like, are reduced.

In view of the above technical problems, it is desirable to improve the same.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome the defect among the above-mentioned prior art, provide a coloured plastic-aluminum membrane that technology is simplified, it can effectively solve the loaded down with trivial details defect of current black plastic-aluminum membrane technology, effectively improves the weak point of the outer performance of black plastic-aluminum membrane simultaneously.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a colored aluminum-plastic film comprises a cast polypropylene film layer, an aluminum foil layer and an outer protection layer which are sequentially arranged; a first bonding layer is coated between the aluminum foil layer and the cast polypropylene film layer; a second bonding layer is coated between the aluminum foil layer and the outer protection layer; the cast polypropylene film layer, the aluminum foil layer and the nylon layer are compounded by heating and pressurizing; the second adhesive layer is a colored protective layer.

As an optimized scheme of the utility model, first adhesive linkage is the epoxy glue film, and the second adhesive linkage is the polyurethane glue film, and the thickness of first adhesive linkage and second adhesive linkage is 3 mu m.

As a preferred scheme of the utility model, the thickness of the aluminum foil layer is 35-40 μm.

As a preferred scheme of the utility model, outer protective layer includes polyethylene terephthalate layer or nylon layer, and wherein, outer protective layer's thickness is 15-25 mu m.

As a preferred embodiment of the present invention, the thickness of the cast polypropylene film layer is 30 to 40 μm.

As an optimized proposal of the utility model, the cast polypropylene film layer is formed by compounding three-layer polypropylene.

As a preferred scheme of the utility model, the cast polypropylene film layer comprises a corona layer, a middle layer and a heat sealing layer which are compounded together; the corona layer, the middle layer and the heat sealing layer are alternately arranged at an angle of 0 degree and an angle of 90 degrees.

As a preferred scheme of the utility model, the corona layer is paved in 45 degrees; paving the middle layer in 90 degrees; the heat sealing layer is paved at a angle of-45 degrees.

As an optimized scheme of the utility model, the thickness ratio on corona layer, intermediate level and heat-seal layer is: 1: 10: 2.

as a preferred embodiment of the present invention, the corona layer is a polypropylene copolymer; the middle layer comprises homopolymerized polypropylene containing a nucleating agent, and the heat sealing layer is ternary copolymer polypropylene.

The utility model has the advantages that:

1. the second bonding layer of the utility model is a colored aluminum plastic film of the colored bonding layer, which effectively prevents the slipping agent from separating out in the high-temperature processing process of the aluminum plastic film, increases the slip degree of the surface of the aluminum plastic film and is beneficial to the deep punching forming performance of the aluminum plastic film; in the use process after the cell is manufactured by processing and forming the aluminum-plastic film, the colored bonding layer effectively prevents water vapor from permeating, and the humidity and heat resistance of the aluminum-plastic film are improved. Meanwhile, the common black aluminum plastic film has the disadvantages of complicated processing technology, higher cost and poor actual utility, while the colored aluminum plastic film has the advantages of simple and convenient technology, lower cost and obvious actual utility.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of a cast polypropylene film layer of the present invention;

reference numbers in the figures: the adhesive comprises a cast polypropylene film layer 10, a corona layer 11, an intermediate layer 12, a heat sealing layer 13, a first adhesive layer 20, an aluminum foil layer 30, a second adhesive layer 40 and an outer protective layer 50.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the accompanying drawings.

Example (b): as shown in fig. 1, a colored aluminum-plastic film comprises a cast polypropylene film layer 10, an aluminum foil layer 30 and an outer protective layer 50 which are sequentially arranged; a first bonding layer 20 is coated between the aluminum foil layer 30 and the cast polypropylene film layer 10; a second bonding layer 40 is coated between the aluminum foil layer 30 and the outer protection layer 50; the cast polypropylene film layer 10, the aluminum foil layer 30 and the outer protection layer 50 are compounded by heating and pressurizing; the first adhesive layer 20 is an epoxy resin adhesive layer, the second adhesive layer 40 is a polyurethane adhesive layer, and the thicknesses of the first adhesive layer 20 and the second adhesive layer 40 are both 3 micrometers.

The outer protective layer 50 includes a polyethylene terephthalate layer or a nylon layer, wherein the thickness of the outer protective layer 50 is 15 to 25 μm.

The second adhesive layer 40 is a colored protective layer; the second adhesive layer 40 is prepared by mixing non-benzene and halogen-free compound ink with polyurethane adhesive, and the hue of the ink is set as follows: 92 ink color, 89 dark brown color and matte ink; the lower surface of the aluminum foil layer 30 is coated with a second adhesive layer 40, and the lower surface of the colored adhesive layer 40 is adhered to the nylon layer.

The second bonding layer of the utility model is a colored aluminum plastic film of the colored bonding layer, which effectively prevents the slipping agent from separating out in the high-temperature processing process of the aluminum plastic film, increases the slip degree of the surface of the aluminum plastic film and is beneficial to the deep punching forming performance of the aluminum plastic film; in the use process after the cell is manufactured by processing and forming the aluminum-plastic film, the colored bonding layer effectively prevents water vapor from permeating, and the humidity and heat resistance of the aluminum-plastic film are improved. Meanwhile, the common black aluminum plastic film has the disadvantages of complicated processing technology, higher cost and poor actual utility, while the colored aluminum plastic film has the advantages of simple and convenient technology, lower cost and obvious actual utility.

As shown in fig. 2, the thickness of the cast polypropylene film layer 10 is 30 to 40 μm, and the cast polypropylene film layer 10 is compounded by three polypropylene layers; the cast polypropylene film layer 10 comprises a corona layer 11, an intermediate layer 12 and a heat seal layer 13 which are compounded together;

the outermost heat-sealing layer 13 is terpolymer polypropylene, has good heat-sealing performance and forms good cohesive force with a tab material, the middle layer 12 comprises homopolymer polypropylene containing a nucleating agent, plays a role in electrolyte resistance and resists corrosion of hydrofluoric acid to a battery cell to a certain extent, and the innermost corona layer 11 is a polypropylene copolymer; is overlapped with the aluminum foil layer 30; the thickness of the aluminum foil layer 30 is 35-40 μm; the aluminum foil layer 30 plays a role in shielding electromagnetic waves and blocking moisture, can ensure that transmission signals are stable and reliable, reduces interference, and simultaneously blocks water vapor from entering the battery core to a certain extent.

The corona layer 11, the intermediate layer 12 and the heat seal layer 13 are alternately arranged at an angle of 0 degree and 90 degrees, and the corona layer 11 is layered at an angle of 45 degrees; the middle layer 12 is laid in 90 degrees; the heat sealing layer 13 is paved at an angle of-45 degrees; the thickness ratio of the corona layer 11, the intermediate layer 12 and the heat-seal layer 13 is as follows: 1: 10: 2; specifically, the stretching directions of the adjacent corona layer 11, the intermediate layer 12 and the heat sealing layer 13 are crossed, so that the stretching strength in all directions and the flexibility of the aluminum plastic film are enhanced, the heat sealing performance and the anti-buffering effect are good, the fracture is not easy to occur, and the service life is long.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Although the reference numerals in the figures are used more here: cast polypropylene film layer 10, corona layer 11, intermediate layer 12, heat seal layer 13, first adhesive layer 20, aluminum foil layer 30, second adhesive layer 40, outer protective layer 50, and the like, but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. A colored aluminum-plastic film is characterized in that: comprises a cast polypropylene film layer (10), an aluminum foil layer (30) and an outer protection layer (50) which are sequentially arranged; a first bonding layer (20) is coated between the aluminum foil layer (30) and the cast polypropylene film layer (10); a second bonding layer (40) is coated between the aluminum foil layer (30) and the outer protection layer (50); the cast polypropylene film layer (10), the aluminum foil layer (30) and the outer protection layer (50) are compounded by heating and pressurizing; the second adhesive layer (40) is a colored protective layer.

2. A colored aluminum-plastic film according to claim 1, wherein: the first bonding layer (20) is an epoxy resin adhesive layer, the second bonding layer (40) is a polyurethane adhesive layer, and the thicknesses of the first bonding layer (20) and the second bonding layer (40) are both 3 micrometers.

3. A colored aluminum-plastic film according to claim 1, wherein: the thickness of the aluminum foil layer (30) is 35-40 μm.

4. A colored aluminum-plastic film according to claim 1, wherein: the outer layer protection layer (50) comprises a polyethylene terephthalate layer or a nylon layer, wherein the thickness of the outer layer protection layer (50) is 15-25 mu m.

5. A colored aluminum-plastic film according to claim 1, wherein: the cast polypropylene film layer (10) has a thickness of 30-40 μm.

6. The colored aluminum-plastic film of claim 5, wherein: the cast polypropylene film layer (10) is formed by compounding three polypropylene layers.

7. The colored aluminum-plastic film of claim 6, wherein: the cast polypropylene film layer (10) comprises a corona layer (11), an intermediate layer (12) and a heat sealing layer (13) which are compounded together; the corona layer (11), the middle layer (12) and the heat sealing layer (13) are alternately arranged at an angle of 0 degree and 90 degrees.

8. The colored aluminum-plastic film of claim 7, wherein: the corona layer (11) is paved in 45 degrees; the middle layer (12) is paved in 90 degrees; the heat sealing layer (13) is paved in a-45-degree layer.

9. The colored aluminum-plastic film of claim 8, wherein: the thickness ratio of the corona layer (11), the middle layer (12) and the heat sealing layer (13) is as follows: 1: 10: 2.

10. a colored aluminum-plastic film according to claim 9, wherein: the corona layer (11) is a polypropylene copolymer; the middle layer (12) comprises homopolymerized polypropylene containing a nucleating agent, and the heat sealing layer (13) is ternary copolymerized polypropylene.