CN218558224U

CN218558224U - Lithium battery aluminum plastic film with good buffering performance

Info

Publication number: CN218558224U
Application number: CN202223162516.5U
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: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-03-03
Anticipated expiration: 2032-11-28

Abstract

The utility model relates to a better lithium cell plastic-aluminum membrane of shock-absorbing capacity, from outer to interior strengthening layer of including in proper order, the protective layer, the sandwich layer, PP drenches rete and heat-seal layer, from outer to interior isolation rete that has set gradually between protective layer and the sandwich layer, porous buffer film layer and spraying aluminium lamination, sandwich layer and PP drench and have set gradually the isolation rete from outer to interior between the rete, porous buffer film layer and spraying aluminium lamination, adjacent strengthening layer, the protective layer, the isolation rete, porous buffer film layer, spraying aluminium lamination, the sandwich layer, PP drenches and bonds together through the adhesive between rete and the heat-seal layer, the sandwich layer is from outer to interior aluminium foil layer and the aramid fiber layer of including in proper order. The utility model discloses an isolation rete, porous buffer film layer and the spraying aluminium lamination that sets gradually in the inside and outside of sandwich layer can effectively improve the buffer capacity, canned type and the separation nature of plastic-aluminum membrane, reduce the risk that aluminium foil layer crackle.

Description

Lithium battery aluminum plastic film with good buffering performance

Technical Field

The utility model relates to a lithium cell plastic-aluminum membrane correlation technique field especially relates to a better lithium cell plastic-aluminum membrane of shock-absorbing capacity.

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 massive search, the publication number of the prior art is CN211125701U, and a lithium ion battery aluminum-plastic film is disclosed, wherein the lithium ion battery aluminum-plastic film sequentially comprises from outside to inside: the upper surface layer is a nylon layer or a terylene layer; the sandwich layer comprises an aluminum foil layer and an aramid fiber layer, wherein the aramid fiber layer comprises aramid fiber or aramid fiber modified materials and a lower surface layer, and the lower surface layer is a polypropylene layer. The lithium ion battery aluminum-plastic film disclosed by the invention has the advantages that the aramid fiber layer is added on the core layer, so that the anti-needling strength of the lithium ion battery aluminum-plastic film is improved, and the guarantee is provided for the safe work of the lithium ion battery.

In summary, the conventional aluminum plastic film for the lithium battery has a risk of easily generating bubbles in a long-term use process, and cracks may be 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 lithium battery aluminum plastic film with better buffering performance, so that the lithium battery aluminum plastic film has more industrial utilization value.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing a better lithium cell plastic-aluminum membrane of shock-absorbing capacity.

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

the utility model provides a better lithium cell plastic-aluminum membrane of shock-absorbing capacity, from outer to interior strengthening layer that includes in proper order, the protective layer, the sandwich layer, PP drenches rete and heat-seal layer, from outer to interior isolation rete that has set gradually between protective layer and the sandwich layer, porous buffer film layer and spraying aluminium lamination, sandwich layer and PP drench and have set gradually the isolation rete from outer to interior between the rete, porous buffer film layer and spraying aluminium lamination, adjacent strengthening layer, the protective layer, the isolation rete, porous buffer film layer, the spraying aluminium lamination, the sandwich layer, PP drenches and bonds together through the adhesive between rete and the heat-seal layer, the sandwich layer includes aluminium foil layer and aramid fiber layer from outer to interior in proper order.

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 20-30 um.

As a further improvement of the utility model, the protective layer comprises a PET casting film outer protective layer and a PA casting film outer protective layer from outside to inside in sequence.

As a further improvement of the utility model, the thickness of the PET casting film outer protective layer is 10-25um, and the thickness of the PA casting film outer protective layer is 15-30 um.

As a further improvement of the utility model, the isolation film layer is a PE film, and the thickness of the isolation film layer is 5-10 um; the porous buffer film layer at least comprises two micro layers from top to bottom, the micro layers are distributed with through holes and are arranged in a staggered way, and the thickness of the porous buffer film layer is 5-15 um; the spraying aluminum layer is a plasma arc spraying aluminum layer, and the thickness of the spraying aluminum layer is 1-5 um; the thickness of the PP laminated film layer is 10-20 um.

As a further improvement, the thickness of the aluminum foil layer is 10-30 um, and the thickness of the aramid fiber layer is 10-20 um.

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

the utility model can effectively improve the buffering capacity, sealing type and separation performance of the aluminum plastic film and reduce the risk of cracks on the aluminum foil layer through the isolation film layer, the porous buffer film layer and the sprayed aluminum layer which are arranged in sequence on the inner side and the outer side of the core layer; the isolating membrane layer can inhibit glue from permeating into the porous buffer membrane layer, and the buffering capacity of the porous buffer membrane layer is further ensured.

The above description is only an outline of the technical solution of the present invention, and in order to make the technical means of the present invention more clearly understood and to be implemented in accordance with the content of the specification, the following detailed description will be given of preferred embodiments of the present invention in conjunction with the 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 diagram of an aluminum plastic film of a lithium battery with better buffering performance;

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

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

fig. 4 is a schematic view of the structure of the core layer in fig. 1.

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

1. Reinforcing layer 2 protective layer

3. Isolation film layer 4 porous buffer film layer

5. 6 core layers of sprayed aluminum layers

7 PP drenches rete 8 heat seal layers

11. Nylon film 12 polypropylene carbon fiber composite film

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

61. Aluminum foil layer 62 aramid fiber layer

Detailed Description

The following detailed description of the embodiments of the present invention is made 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 solution of the present invention better understood, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings 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 the person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

As shown in figures 1 to 4 of the drawings,

the utility model provides a better lithium cell plastic-aluminum membrane of shock-absorbing capacity, from outer to interior strengthening layer 1 that includes in proper order, protective layer 2, sandwich layer 6, PP drenches rete 7 and heat-seal layer 8, from outer to interior isolation rete 3 that has set gradually between protective layer 2 and the sandwich layer 6, porous buffer rete 4 and spraying aluminium lamination 5, sandwich layer 6 and PP drench rete 7 between from outer to interior isolation rete 3 that has set gradually, porous buffer rete 4 and spraying aluminium lamination 5, adjacent strengthening layer 1, protective layer 2, isolation rete 3, porous buffer rete 4, spraying aluminium lamination 5, sandwich layer 6, PP drenches and bonds together through the adhesive between rete 7 and the heat-seal layer 8.

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 20-30 um.

The 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 10-25um, and the thickness of the PA casting film outer protective layer 22 is 15-30 um.

The isolation film layer 3 is a PE film, and the thickness of the isolation film layer 3 is 5-10 um.

The porous buffer film layer 4 is formed by compounding at least two micro layers from top to bottom, the micro layers are distributed with through holes and are arranged in a staggered manner, and the thickness of the porous buffer film layer 4 is 5-15 um.

The aluminum spraying layer 5 is a plasma arc aluminum spraying layer, and the thickness of the aluminum spraying layer 5 is 1-5 um; thereby form plasma arc spraying aluminium lamination at the inside and outside of sandwich layer 4 through plasma arc, can effectively reduce the pinhole quantity of aluminium foil layer 41 to improve its barrier properties.

The thickness of the PP lamination layer 7 is 10-20 um. In some scenes, the PP laminated layer 7 can serve to connect the core layer and the heat seal layer, and can bond the core layer and the heat seal layer better than the adhesive.

The core layer 6 comprises an aluminum foil layer 61 and an aramid fiber layer 62 in sequence from outside to inside, and the aramid fiber layer 62 can be para-aramid fiber or meta-aramid fiber and the like. The thickness of aluminium foil layer 61 is 10 ~ 30um, and the thickness of aramid layer 62 is 10 ~ 20um.

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", etc. 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 indicated. 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 should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection: 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 better lithium cell plastic-aluminum membrane of shock-absorbing capacity includes strengthening layer (1), protective layer (2), sandwich layer (6), PP in proper order from outer to interior drenches rete (7) and heat-seal layer (8), its characterized in that, from outer to interior isolation film layer (3), porous buffer film layer (4) and spraying aluminium lamination (5) have set gradually between protective layer (2) and sandwich layer (6), it is adjacent that isolation film layer (3), porous buffer film layer (4) and spraying aluminium lamination (5) have set gradually from outer to interior between sandwich layer (6) and the PP drenches rete (7) bond together through the adhesive between rete (7) and the heat-seal layer (8) strengthening layer (1), protective layer (2), isolation film layer (3), porous buffer film layer (4), spraying aluminium lamination (5), sandwich layer (6), PP drenches the rete (7) and heat-seal layer (8) and is in the same place, sandwich layer (6) include aluminium foil layer (61) and aramid fiber layer (62) from outer to interior in proper order.

2. The lithium battery aluminum plastic film with better buffering performance 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 lithium battery aluminum plastic film with better buffering performance 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 20-30 um.

4. The lithium battery aluminum plastic film with better buffering performance as claimed in claim 1, characterized in that the 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 lithium battery aluminum plastic film with better buffering performance as claimed in claim 4, characterized in that the thickness of the PET casting film outer protection layer (21) is 10-25 um, and the thickness of the PA casting film outer protection layer (22) is 15-30 um.

6. The lithium battery aluminum plastic film with better buffering performance as claimed in claim 1, characterized in that the isolation film layer (3) is a PE film, and the thickness of the isolation film layer (3) is 5-10 um; the porous buffer film layer (4) is formed by compounding at least two micro layers from top to bottom, through holes are distributed on the micro layers and are arranged in a staggered mode, and the thickness of the porous buffer film layer (4) is 5-15 mu m; the spraying aluminum layer (5) is a plasma arc spraying aluminum layer, and the thickness of the spraying aluminum layer (5) is 1-5 um; the thickness of the PP laminated film layer (7) is 10-20 um.

7. The lithium battery aluminum-plastic film with better buffering performance as claimed in claim 1, wherein the thickness of the aluminum foil layer (61) is 10-30 um, and the thickness of the aramid fiber layer (62) is 10-20 um.