CN216359831U

CN216359831U - Packaging film for lithium battery without aluminum foil

Info

Publication number: CN216359831U
Application number: CN202120881091.XU
Authority: CN
Inventors: 李志嘉; 张武林; 刘剑光
Original assignee: Liyang Zhuoyue New Material Technology Co ltd
Current assignee: Liyang Zhuoyue New Material Technology Co ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2022-04-22
Anticipated expiration: 2031-04-26

Abstract

The utility model discloses an aluminum foil-free packaging film for a lithium battery, which sequentially comprises a first PET (polyethylene terephthalate) film layer, a first adhesive layer, a PA (polyamide) film layer, a second adhesive layer, a second PET film layer, a third adhesive layer and a polypropylene film layer from top to bottom, wherein an aluminum-plated layer is formed on at least one side surface of the second PET film layer. According to the utility model, the aluminum foil layer is replaced by the aluminum-plated PET film layer, so that the barrier property of the packaging film is improved, and the lithium battery can obtain higher energy density; meanwhile, an aluminum foil layer with higher density is eliminated, so that the aim of lightening the lithium battery is fulfilled; by arranging the first PET film layer, the packaging film obtains better heat resistance and electrolyte resistance functions; through setting up the PA thin layer, effectively improved the deep punching performance of packaging film.

Description

Packaging film for lithium battery without aluminum foil

Technical Field

The utility model relates to the technical field of lithium battery packaging materials, in particular to a packaging film for a lithium battery without aluminum foil.

Background

At present, the technology of the lithium ion battery is mature day by day, and the soft package aluminum plastic film is widely applied to the fields of 3C electronic products, power batteries, energy storage and the like due to the advantages of light weight, safety and the like. With the progress of social technology and the development of lithium ion battery electric vehicles, the requirements for light weight and energy density of batteries are higher and higher while the manufacturing cost of lithium batteries is required to be reduced.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides the packaging film for the lithium battery without the aluminum foil, which can reduce the production cost of enterprises, improve the energy density of the battery and lighten the weight of the packaging film for the lithium battery.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a no aluminium foil's packaging film for lithium cell includes first PET thin layer, first adhesive layer, PA thin layer, second adhesive layer, second PET thin layer, third adhesive layer and polypropylene thin layer from top to bottom in proper order, at least one side surface on second PET thin layer is formed with the aluminizing layer.

As a preferred scheme, the thickness of the first PET film layer is 15-30 mu m, and the thickness of the second PET film layer is 15-30 mu m.

Preferably, the total thickness of the first PET film layer and the second PET film layer is more than or equal to 40 μm.

As a preferable scheme, the thickness of the PA film layer is 15-60 mu m, and the thickness of the polypropylene film layer is 30-80 mu m.

As a preferred scheme, the total thickness of the first PET film layer, the PA film layer and the second PET film layer is less than or equal to the thickness of the polypropylene film layer.

As a preferable scheme, the thickness of the first adhesive layer is 3-6 μm, the thickness of the second adhesive layer is 2-5 μm, and the thickness of the third adhesive layer is 3-6 μm.

Preferably, the first adhesive layer is a two-component polyurethane adhesive containing black ink, the second adhesive layer is a two-component polyurethane adhesive, and the third adhesive layer is an acid-modified polyolefin adhesive.

Preferably, an aluminum plating layer is formed on the side of the second PET film layer facing the third adhesive layer, the thickness of the aluminum plating layer is 500-1000 angstroms, and a passivation solution treatment layer is formed on the side of the aluminum plating layer facing the third adhesive layer.

As a preferred scheme, the polypropylene film layer is a three-layer co-extrusion film and comprises a glue layer, a base material layer and a heat sealing layer.

Preferably, the glue layer is maleic anhydride modified polyolefin resin, the base material layer is polypropylene resin, and the heat seal layer is ethylene-propylene copolymer resin.

Compared with the prior art, the packaging film has obvious advantages and beneficial effects, and particularly, the aluminum foil layer is replaced by the aluminum-plated PET film layer, so that the barrier property of the packaging film is improved, and the lithium battery obtains higher energy density; meanwhile, an aluminum foil layer with higher density is eliminated, so that the aim of lightening the lithium battery is fulfilled; by arranging the first PET film layer, the packaging film obtains better heat resistance and electrolyte resistance functions; through setting up the PA thin layer, effectively improved the deep punching performance of packaging film.

To more clearly illustrate the structural features and technical means of the present invention and the specific objects and functions attained thereby, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:

drawings

FIG. 1 is an assembled structure diagram of an embodiment of the present invention.

The attached drawings indicate the following:

10. a first PET film layer; 20. a first adhesive layer 30, a PA film layer,

40. A second adhesive layer; 50. A second PET film layer; 60. A third adhesive layer;

70. a polypropylene film layer; 80. And (6) plating an aluminum layer.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the positions or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

As shown in fig. 1, the packaging film for an aluminum-foil-free lithium battery comprises a first PET film layer 10, a first adhesive layer 20, a PA film layer 30, a second adhesive layer 40, a second PET film layer 50, a third adhesive layer 60 and a polypropylene film layer 70 in sequence from top to bottom, wherein an aluminum-plated layer 80 is formed on at least one side surface of the second PET film layer 50.

In the utility model, the thickness of the first PET film layer 10 is 15-30 μm, the thickness of the second PET film layer 50 is 15-30 μm, the thickness of the PA film layer 30 is 15-60 μm, the thickness of the polypropylene film layer 70 is 30-80 μm, the total thickness of the first PET film layer 10 and the second PET film layer 50 is more than or equal to 40 μm, and the total thickness of the first PET film layer 10, the PA film layer 30 and the second PET film layer 50 is less than or equal to the thickness of the polypropylene film layer 70.

The thickness of the first adhesive layer 20 is 3-6 μm, the thickness of the second adhesive layer 40 is 2-5 μm, and the thickness of the third adhesive layer 60 is 3-6 μm. The first adhesive layer 20 is a two-component polyurethane adhesive containing black ink, so that the purpose of bonding can be achieved and the effect of shading is achieved at the same time, the second adhesive layer 40 is a two-component polyurethane adhesive, and the third adhesive layer 60 is an acid-modified polyolefin adhesive.

An aluminum plating layer 80 is formed on one side of the second PET film layer 50 facing the third adhesive layer 60, the thickness of the aluminum plating layer is 500-1000 angstroms, and a passivation solution treatment layer is formed on one side of the aluminum plating layer 80 facing the third adhesive layer 60.

The polypropylene film layer 70 is a three-layer co-extruded film, and comprises a glue layer, a substrate layer and a heat sealing layer. The glue layer is maleic anhydride modified polyolefin resin, the base material layer is polypropylene resin, and the heat sealing layer is ethylene-propylene copolymer resin.

In conclusion, the aluminum foil layer is replaced by the aluminized PET film layer, so that the barrier property of the packaging film is improved, and the lithium battery obtains higher energy density; meanwhile, an aluminum foil layer with higher density is eliminated, so that the aim of lightening the lithium battery is fulfilled; by arranging the first PET film layer, the packaging film obtains better heat resistance and electrolyte resistance functions; through setting up the PA thin layer, effectively improved the deep punching performance of packaging film.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the present invention, so that any modifications, equivalents, improvements, etc. made to the above embodiment according to the present invention are within the scope of the present invention.

Claims

1. The utility model provides a no aluminium foil's packaging film for lithium cell which characterized in that includes first PET film layer (10), first adhesive layer (20), PA film layer (30), second adhesive layer (40), second PET film layer (50), third adhesive layer (60) and polypropylene film layer (70) from top to bottom in proper order, at least one side surface of second PET film layer (50) is formed with aluminizing layer (80).

2. The aluminum foil-free packaging film for lithium batteries as claimed in claim 1, wherein the thickness of the first PET film layer (10) is 15-30 μm, and the thickness of the second PET film layer (50) is 15-30 μm.

3. The packaging film for the lithium battery without the aluminum foil as claimed in claim 2, wherein the total thickness of the first PET film layer (10) and the second PET film layer (50) is not less than 40 μm.

4. The packaging film for the lithium battery without the aluminum foil as claimed in claim 3, wherein the thickness of the PA film layer (30) is 15-60 μm, and the thickness of the polypropylene film layer (70) is 30-80 μm.

5. The packaging film for lithium battery without aluminum foil as claimed in claim 4, wherein the total thickness of the first PET film layer (10), the PA film layer (30) and the second PET film layer (50) is less than or equal to the thickness of the polypropylene film layer (70).

6. The packaging film for an aluminum foil-free lithium battery as claimed in any one of claims 1 to 5, wherein the first adhesive layer (20) has a thickness of 3 to 6 μm, the second adhesive layer (40) has a thickness of 2 to 5 μm, and the third adhesive layer (60) has a thickness of 3 to 6 μm.

7. The aluminum foil-free packaging film for lithium batteries according to claim 6, wherein the first adhesive layer (20) is a two-component polyurethane adhesive containing black ink, the second adhesive layer (40) is a two-component polyurethane adhesive, and the third adhesive layer (60) is an acid-modified polyolefin adhesive.

8. The packaging film for an aluminum-foil-free lithium battery as claimed in any one of claims 1 to 5, wherein an aluminum-plated layer (80) is formed on the side of the second PET film layer (50) facing the third adhesive layer (60), the aluminum-plated layer has a thickness of 500-1000 angstroms, and a passivation solution treatment layer is formed on the side of the aluminum-plated layer (80) facing the third adhesive layer (60).

9. The packaging film for lithium battery without aluminum foil as claimed in any one of claims 1 to 5, wherein the polypropylene film layer (70) is a three-layer co-extruded film comprising a glue layer, a base material layer and a heat sealing layer.

10. The packaging film for a lithium battery without an aluminum foil as claimed in claim 9, wherein the glue layer is a maleic anhydride modified polyolefin resin, the base material layer is a polypropylene resin, and the heat seal layer is an ethylene-propylene copolymer resin.