CN218558222U

CN218558222U - Novel aluminum plastic film for lithium battery

Info

Publication number: CN218558222U
Application number: CN202223041778.6U
Authority: CN
Inventors: 付有虎; 董青山
Original assignee: Kunshan Zhixin Tiancheng Electronic Material Co ltd
Current assignee: Kunshan Zhixin Tiancheng Electronic Material Co ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-03-03
Anticipated expiration: 2032-11-16

Abstract

The utility model relates to a novel plastic-aluminum membrane for lithium cell includes the strengthening layer from outer to interior in proper order, outer protective layer, aluminium foil layer and heat-seal layer, from outer extremely interior heat shrink rete and the aluminizing rete of having set gradually between outer protective layer and the aluminium foil layer, adjacent strengthening layer, outer protective layer, heat shrink rete, the aluminizing rete, bond together through the adhesive between aluminium foil layer and the heat-seal layer, heat shrink rete from outer to interior PA microlayer of including in proper order, EVA microlayer, PVDC microlayer, EVA microlayer and PA microlayer, the aluminizing rete includes the substrate layer from outer to interior in proper order, aluminize layer and corona layer. The utility model discloses a thermal contraction rete and the aluminizing rete that set gradually between outer protective layer, aluminium foil layer can reduce the risk that produces the tympanic bulla and aluminium foil layer crackle. In addition, the barrier property and the sealing property of the aluminum plastic film are simultaneously enhanced.

Description

Novel aluminum plastic film for lithium battery

Technical Field

The utility model relates to a relevant technical field of plastic-aluminum membrane especially relates to a novel plastic-aluminum membrane for lithium cell.

Background

In recent years, with the development of miniaturization, thinning, large capacity and high power charging and discharging of lithium batteries, aluminum plastic films which are light, thin, flexible and high in mechanical strength become one of the important points of research and development in related fields. And cladding the bare cell by adopting an aluminum-plastic composite film, and performing hot-press packaging on the two layers of aluminum-plastic composite films on the top surface and the side surface.

Through the massive search, the publication number of the prior art is CN208400892U, and the prior art discloses a coating film structure for a lithium battery, which comprises a nylon film, a polypropylene carbon fiber composite film, an aluminum foil, a polypropylene cast film, a polytetrafluoroethylene activated film, an activated layer, a first thermocementing layer, a first dry cementing layer, a second dry cementing layer and a second thermocementing layer, wherein the nylon film is the outermost layer of the coating film and is a reinforced layer, the polypropylene carbon fiber composite film is a reinforced layer, the aluminum foil is a soft metal aluminum layer, the polypropylene cast film is a bonding layer, the polytetrafluoroethylene activated film is the innermost layer of the coating film and is directly contacted with electrolyte, the coating film structure has good electrical insulation, high temperature resistance and corrosion resistance, the activated layer is arranged on one surface of the polytetrafluoroethylene activated film, which is close to the polypropylene cast film, the activated layer is subjected to activation treatment, the second thermocementing layer is coated between the nylon film and the polypropylene carbon fiber composite film for bonding, and the first thermocementing layer is coated between the polytetrafluoroethylene activated film and the polypropylene cast film for bonding.

In summary, the aluminum plastic film of the conventional lithium battery has a risk of easily generating bubbles in a long-term use process, and a crack is generated on an aluminum foil layer in the aluminum plastic film.

In view of the above-mentioned defects, the present designer actively makes research and innovation to create a novel aluminum plastic film for lithium battery, so that the aluminum plastic film has industrial value.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing a novel plastic-aluminum membrane for lithium cell.

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

the utility model provides a novel aluminium-plastic membrane for lithium cell, from outer to interior strengthening layer, outer protective layer, aluminium foil layer and heat-seal layer of including in proper order, from outer to interior heat shrinkage rete and aluminizing rete have set gradually between outer protective layer and the aluminium foil layer, adjacent strengthening layer, outer protective layer, heat shrinkage rete, aluminizing rete, bond together through the adhesive between aluminium foil layer and the heat-seal layer, heat shrinkage rete includes PA microlayer, EVA microlayer, PVDC microlayer, EVA microlayer and PA microlayer in proper order from outer to interior, aluminizing rete includes the substrate layer in proper order from outer to interior, aluminizing layer and corona layer.

As a further improvement of the utility model, the strengthening layer comprises a nylon film layer and a polypropylene carbon fiber composite film layer from outside to inside in sequence.

As a further improvement, the thickness of the nylon film layer is 10-20 um, and the thickness of the polypropylene carbon fiber composite film layer is 30-40 um.

As a further improvement of the utility model, the outer protective layer comprises a PET curtain coating film outer protective layer and a PA curtain coating film outer protective layer from outside to inside in proper order.

As a further improvement of the utility model, the thickness of the external protection layer of the PET casting film is 15-30um, and the thickness of the external protection layer of the PA casting film is 10-30 um.

As a further improvement, the thickness of the aluminum foil layer is 10-40 um, and the heat-sealing layer is a CPP cast film heat-sealing layer and the thickness thereof is 20-40 um.

As a further improvement of the utility model, the thickness of the heat shrinkable film layer is 20-60um, and the thicknesses of the PA microlayer, the EVA microlayer and the PVDC microlayer are the same.

As a further improvement, the thickness of the aluminizing film layer is 10-20 um, and the substrate layer is a BOPP evaporation substrate layer.

Borrow by above-mentioned scheme, the utility model discloses at least, have following advantage:

the utility model discloses a thermal contraction rete and the aluminizing rete that set gradually between outer protective layer, aluminium foil layer can reduce the risk that produces the tympanic bulla and aluminium foil layer crackle. In addition, the barrier property and the sealing property of the aluminum plastic film are simultaneously enhanced.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a novel aluminum-plastic film for a lithium battery of the present invention;

FIG. 2 is a schematic diagram of the structure of the enhancement layer of FIG. 1;

FIG. 3 is a schematic structural diagram of the outer protective layer of FIG. 1;

FIG. 4 is a schematic view of the construction of the heat shrinkable film layer of FIG. 1;

fig. 5 is a schematic structural view of the aluminum plating film layer in fig. 1.

In the drawings, the meanings of the reference numerals are as follows.

1. Outer protective layer of strengthening layer 2

3. Thermal contraction membrane layer 4 aluminized membrane layer

5. 6 heat-sealing layer of aluminum foil layer

11. Nylon membrane 12 polypropylene carbon fiber composite membrane

21 PET casting film outer protective layer 22 PA casting film outer protective layer

31 PA microlayer 32 EVA microlayer

33 PVDC microlayer 41 substrate layer

42. Corona layer of aluminized layer 43

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In order to make the technical solutions of the present invention better understood, the attached drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

Examples

As shown in figures 1 to 5 of the drawings,

a novel aluminum plastic film for a lithium battery sequentially comprises a strengthening layer 1, an outer protection layer 2, an aluminum foil layer 5 and a heat sealing layer 6 from outside to inside, a heat shrinkage film layer 3 and an aluminum plating film layer 4 are sequentially arranged between the outer protection layer 2 and the aluminum foil layer 5 from outside to inside, and the adjacent strengthening layer 1, the outer protection layer 2, the heat shrinkage film layer 3, the aluminum plating film layer 4, the aluminum foil layer 5 and the heat sealing layer 6 are bonded together through a bonding agent which can be a polyurethane adhesive, an epoxy resin adhesive and the like.

The strengthening layer 1 comprises a nylon film layer 11 and a polypropylene carbon fiber composite film layer 12 from outside to inside in sequence. The thickness of the nylon film layer 11 is 10-20 um, and the thickness of the polypropylene carbon fiber composite film layer 12 is 30-40 um.

The outer protective layer 2 includes a PET casting film outer protective layer 21 and a PA casting film outer protective layer 22 in this order from the outside to the inside. The thickness of the PET casting film outer protective layer 21 is 15-30um, and the thickness of the PA casting film outer protective layer 22 is 10-30 um.

The heat shrinkable film layer 3 sequentially comprises a PA micro layer 31, an EVA micro layer 32, a PVDC micro layer 33, an EVA micro layer 32 and the PA micro layer 31 from outside to inside, the thickness of the heat shrinkable film layer 3 is 20-60um, and the thicknesses of the PA micro layer 31, the EVA micro layer 32 and the PVDC micro layer 33 are the same. The heat shrinkable film layer 3 adopts a multi-layer structure, and forms a structure similar to a co-extruded film together, when the lithium battery is heated, the heat shrinkable film layer 3 of the multi-layer structure thermally shrinks and generates a shrinking force, and the stress from the aluminum-plastic film can be counteracted to a certain degree, so that bubbling of the aluminum-plastic film is inhibited.

The aluminized film layer 4 includes a base material layer 41, an aluminized layer 42, and a corona layer 43 in this order from the outside to the inside. The thickness of the aluminized film layer 4 is 10-20 um, and the substrate layer 41 is a BOPP evaporation substrate layer. The surface of the base material layer 41 for vapor deposition of metal is formed into a corona layer 43 by corona, and the aluminum plating layer 42 is vapor deposited on the corona layer 43. Form the separation structure through aluminized film layer 4 and aluminium foil layer 5, can improve the separation nature and the leakproofness of 5 structure plastic-aluminum membranes of independent aluminium foil layer to a certain extent.

The thickness of aluminium foil layer 5 is 10 ~ 40um, and heat-seal layer 6 is CPP curtain coating film heat-seal layer and its thickness is 20 ~ 40um.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. 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, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly referring to the number of technical features being grined. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected: either mechanically or electrically: the terms may be directly connected or indirectly connected through an intermediate member, or may be a communication between two elements.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a novel aluminium-plastic membrane for lithium cell, includes strengthening layer (1), outer protective layer (2), aluminium foil layer (5) and heat-seal layer (6) in proper order from outer to interior, its characterized in that, from outer to interior heat-shrinkable film layer (3) and aluminize rete (4) have set gradually between outer protective layer (2) and aluminium foil layer (5), and be adjacent strengthening layer (1), outer protective layer (2), heat-shrinkable film layer (3), aluminize rete (4), aluminium foil layer (5) and heat-seal layer (6) between bond together through the adhesive, heat-shrinkable film layer (3) include PA microlayer (31), EVA microlayer (32), PVDC microlayer (33), EVA microlayer (32) and PA microlayer (31) from outer to interior in proper order, aluminize rete (4) include substrate layer (41), aluminize layer (42) and corona layer (43) from outer to interior in proper order.

2. The novel aluminum plastic film for the lithium battery as claimed in claim 1, wherein the strengthening layer (1) comprises a nylon film layer (11) and a polypropylene carbon fiber composite film layer (12) in sequence from outside to inside.

3. The novel aluminum plastic film for the lithium battery as claimed in claim 2, wherein the thickness of the nylon film layer (11) is 10-20 um, and the thickness of the polypropylene carbon fiber composite film layer (12) is 30-40 um.

4. The novel aluminum plastic film for the lithium battery as claimed in claim 1, wherein the outer protective layer (2) comprises a PET casting film outer protective layer (21) and a PA casting film outer protective layer (22) in sequence from outside to inside.

5. The novel aluminum plastic film for the lithium battery as recited in claim 4, wherein the thickness of the PET casting film outer protection layer (21) is 15-30 um, and the thickness of the PA casting film outer protection layer (22) is 10-30 um.

6. The novel aluminum plastic film for the lithium battery as claimed in claim 1, wherein the aluminum foil layer (5) has a thickness of 10-40 um, and the heat-sealing layer (6) is a CPP cast film heat-sealing layer having a thickness of 20-40 um.

7. The novel aluminum plastic film for the lithium battery as claimed in claim 1, wherein the thickness of the heat shrinkable film layer (3) is 20-60 um, and the thicknesses of the PA microlayer (31), the EVA microlayer (32) and the PVDC microlayer (33) are the same.

8. The novel aluminum plastic film for the lithium battery as claimed in claim 1, wherein the thickness of the aluminum-plated film layer (4) is 10-20 um, and the substrate layer (41) is a BOPP vapor-deposited substrate layer.