CN221201343U

CN221201343U - Composite aluminum plastic film structure and battery

Info

Publication number: CN221201343U
Application number: CN202322497566.7U
Authority: CN
Inventors: 李姣姣; 肖池池; 安建; 于子龙
Original assignee: Zhejiang Liwei Energy Technology Co ltd
Current assignee: Zhejiang Liwei Energy Technology Co ltd
Priority date: 2023-09-14
Filing date: 2023-09-14
Publication date: 2024-06-21
Anticipated expiration: 2033-09-14

Abstract

The utility model belongs to the technical field of battery aluminum-plastic films, and in particular relates to a composite aluminum-plastic film structure and a battery, wherein the composite aluminum-plastic film structure comprises a supporting layer, a first hydrophobic layer, a substrate layer, a second hydrophobic layer and a corrosion-resistant layer; opposite end surfaces of the substrate layer are respectively connected with the first hydrophobic layer and the second hydrophobic layer; the supporting layer is connected to the first hydrophobic layer at one side far away from the substrate layer; the corrosion-resistant layer is connected to the second hydrophobic layer on the side far away from the substrate layer. The utility model can improve the protective performance of the substrate layer, and can also avoid the bad phenomena of electrolyte leakage and the like in the aluminum plastic film during use, thereby improving the use safety.

Description

Composite aluminum plastic film structure and battery

Technical Field

The utility model belongs to the technical field of battery aluminum-plastic films, and particularly relates to a composite aluminum-plastic film structure and a battery.

Background

Along with the development requirements of mobile or medium-sized energy storage devices, particularly the application development requirements of power lithium batteries with various appearance states, the general composite aluminum plastic film cannot meet the following requirements. Since the electrolyte used in the polymer lithium battery contains lithium hexafluorophosphate; the compound is unstable and decomposes strong acid upon external heating, moisture intrusion, etc. Therefore, the material has strong requirements on the overall isolation performance and the corrosion resistance of the inner layer. Meanwhile, because the electrolyte of the battery core exists in a liquid state and contains small molecular solvents such as dimethyl carbonate and the like, the electrolyte has strong swelling capacity on common polyester materials, and the composite strength of the inner layer can be gradually reduced and even separated; thus, leakage and the like can occur.

However, the existing part of aluminum-plastic film structure is provided with a separation layer on the surface of nylon; the mode increases the thickness of the aluminum plastic film, is not beneficial to the exertion of the energy density of the battery, and cannot avoid the outward infiltration of the internal electrolyte to corrode the aluminum foil; thereby reducing the safety of use.

Disclosure of utility model

The utility model aims at: aiming at the defects of the prior art, the composite aluminum-plastic film structure is provided, and aims to improve the protection performance of the composite aluminum-plastic film structure and ensure the use safety.

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

A composite aluminum plastic film structure comprises a supporting layer, a first hydrophobic layer, a substrate layer, a second hydrophobic layer and a corrosion resistant layer; opposite end surfaces of the substrate layer are respectively connected with the first hydrophobic layer and the second hydrophobic layer; the supporting layer is connected to the first hydrophobic layer at one side far away from the substrate layer; the corrosion-resistant layer is connected to the second hydrophobic layer on the side far away from the substrate layer.

Preferably, the first hydrophobic layer includes a first superhydrophobic adhesive part, and the first superhydrophobic adhesive part is adhered to the substrate layer.

Preferably, the first superhydrophobic adhesive part is of a first epoxy structure.

Preferably, the second hydrophobic layer includes a second superhydrophobic adhesive part, and the second superhydrophobic adhesive part is adhered to the substrate layer.

Preferably, the second superhydrophobic adhesive part is of a second epoxy structure.

Preferably, a relation between the thickness L1 of the first hydrophobic layer and the thickness L2 of the second hydrophobic layer satisfies: l1 is less than or equal to L2.

Preferably, the relation between the sum of the thicknesses of the first hydrophobic layer and the second hydrophobic layer and the total thickness L3 of the composite aluminum plastic film structure satisfies the following formula: l1+l2=a×l3; wherein, A=1/16-1/10.

Preferably, the supporting layer is a nylon layer or a polyester nylon co-extrusion layer; and/or, the substrate layer is an aluminum substrate layer; and/or, the corrosion-resistant layer is a cast polypropylene layer.

Preferably, the end face of the supporting layer is provided with a bulge; the protrusions are arranged along one side away from the first hydrophobic layer in a protruding manner.

The utility model also discloses a battery, which comprises the composite aluminum-plastic film structure.

The utility model has the beneficial effects that the technical scheme can avoid corrosives such as external liquid from penetrating and corroding the substrate layer and electrolyte inside from penetrating and corroding the substrate layer outwards through the second hydrophobic layer by adopting the first hydrophobic layer, thereby improving the protective performance of the substrate layer, and also avoiding bad phenomena such as leakage of the electrolyte inside when the aluminum plastic film is used, and further improving the use safety; besides, the first hydrophobic layer and the second hydrophobic layer are respectively adhered to the two end surfaces of the substrate layer, so that the thickness of the aluminum plastic film can be effectively reduced, the energy density of the battery can be improved, and the use stability is improved; and the supporting stability of the aluminum plastic film is guaranteed through the supporting layer, and the corrosion resistance of the aluminum plastic film to the inside can be improved through the corrosion-resistant layer, so that the use stability is improved, and the service life of the aluminum plastic film is prolonged.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to fig. 1 to 3.

FIG. 1 is a schematic structural diagram of a composite aluminum plastic film according to an embodiment of the present utility model;

FIG. 2 is a schematic structural diagram of a composite aluminum plastic film according to an embodiment of the present utility model;

Fig. 3 is a schematic structural diagram of a composite aluminum plastic film structure according to an embodiment of the utility model.

In the figure: 1-a support layer; 11-protrusions; 111-a first guiding oblique side; 112-a second guiding oblique side; 2-a first hydrophobic layer; 21-a first superhydrophobic adhesive means; 3-a substrate layer; 4-a second hydrophobic layer; 41-a second superhydrophobic adhesive means; 5-corrosion resistant layer.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiment of the present application, the term "and/or" is merely a relationship between a composite aluminum-plastic film structure and a battery description association object, which indicates that three relationships may exist, for example, a and/or B may indicate: a alone, both a and B, and a plurality of cases alone. In addition, the character "/" herein generally indicates that the front and rear related objects are in a relationship of a composite aluminum plastic film structure and a battery or.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

The present utility model will be described in further detail with reference to fig. 1 to 3, but the present utility model is not limited thereto.

As shown in fig. 1, in an embodiment of the present utility model, the composite aluminum plastic film structure; comprises a supporting layer 1, a first hydrophobic layer 2, a substrate layer 3, a second hydrophobic layer 4 and a corrosion resistant layer 5; the opposite end surfaces of the substrate layer 3 are respectively bonded with the first hydrophobic layer 2 and the second hydrophobic layer 4; the support layer 1 is adhered to the first hydrophobic layer 2 on the side far away from the substrate layer 3; the corrosion resistant layer 5 is bonded to the second hydrophobic layer 4 on the side remote from the substrate layer 3.

According to the technical scheme, the first hydrophobic layer is adopted, so that corrosions such as external liquid and the like can be prevented from penetrating and corroding the substrate layer, and the electrolyte in the second hydrophobic layer can be prevented from penetrating and corroding the substrate layer outwards, thereby improving the protective performance of the substrate layer, avoiding bad phenomena such as leakage of the electrolyte in the aluminum plastic film during use, and further improving the use safety; besides, the first hydrophobic layer and the second hydrophobic layer are respectively adhered to the two end surfaces of the substrate layer, so that the thickness of the aluminum plastic film can be effectively reduced, the energy density of the battery can be improved, and the use stability is improved; and the supporting stability of the aluminum plastic film is guaranteed through the supporting layer, and the corrosion resistance of the aluminum plastic film to the inside can be improved through the corrosion-resistant layer, so that the use stability is improved, and the service life of the aluminum plastic film is prolonged.

Specifically, in some embodiments, as shown in fig. 2, the first hydrophobic layer 2 includes a first superhydrophobic adhesive part 21, and the first superhydrophobic adhesive part 21 is adhered to the substrate layer 3. The substrate layer and the rapid assembly function thereof can be effectively enabled through the adhesion function of the first superhydrophobic adhesion component 21, and the additional addition of the adhesion structure can be avoided, so that the thickness of the aluminum plastic film is effectively reduced, the energy density of the battery is improved, and the use stability is improved. Wherein in some embodiments, the first superhydrophobic adhesive part 21 is a first epoxy structure. The stability of adhesion and installation between the first epoxy resin structure and the outer surface of the substrate layer can be guaranteed, and corrosion of the substrate layer caused by penetration of external corrosive substances such as liquid can be effectively prevented.

Specifically, in some embodiments, as shown in fig. 2, the second hydrophobic layer 4 includes a second superhydrophobic adhesive part 41, and the second superhydrophobic adhesive part 41 is adhered to the substrate layer 3. The second superhydrophobic adhesive part 41 can effectively realize the rapid assembly of the substrate layer and the substrate layer, and can avoid additionally arranging an adhesive structure, thereby effectively reducing the thickness of the aluminum plastic film, being beneficial to improving the energy density of the battery and improving the use stability. Wherein in some embodiments the second hydrophobic layer 41 is a second epoxy structure. The second epoxy resin structure can ensure the stability of adhesion and installation between the second epoxy resin structure and the inner surface of the substrate layer, and can also effectively prevent the phenomena of corrosion or leakage of the substrate layer caused by penetration of substances such as internal moisture, electrolyte and the like.

And under the condition that the spraying distance is 10-15 cm and the spraying pressure is 0.3-0.5 MPa, the first epoxy resin structure and the second epoxy resin structure are sprayed on the two opposite surface super-hydrophobic bonding layers of the substrate layer, so that the convenience and stability of assembly are ensured.

Specifically, in some embodiments, as shown in fig. 2, the thickness L1 of the first hydrophobic layer 2 is less than or equal to the thickness L2 of the second hydrophobic layer 41. Wherein the thickness L1 of the first hydrophobic layer 2 is 3 to 5 μm, the thickness L2 of the second hydrophobic layer 41 is 3 to 5 μm, and the thickness L1 of the first hydrophobic layer 2 is less than or equal to the thickness L2 of the second hydrophobic layer 41. The stability of the assembly support of the support layer 1 can be ensured through the first hydrophobic layer 2 with relatively smaller or equal thickness dimension, the use of materials can be effectively reduced, the overall thickness of the composite aluminum plastic film can be effectively reduced, and the improvement of the energy density of the battery is facilitated.

Specifically, in some embodiments, as shown in fig. 2, the relation between the sum of the thicknesses L1 and L2 of the first and second hydrophobic layers 2 and 41 and the total thickness L3 of the composite aluminum plastic film structure satisfies the following formula: l1+l2=a×l3; wherein, A=1/16-1/10. The structure can realize the functions of separating water or electrolyte and other substances of the composite aluminum-plastic film through the first hydrophobic layer 2 and the second hydrophobic layer 41 in reasonable proportion, and can effectively reduce the whole thickness of the composite aluminum-plastic film, thereby being beneficial to improving the energy density of the battery.

Specifically, in some embodiments, the support layer 1 is a Nylon layer (Nylon) or a polyester Nylon co-extruded layer; the substrate layer 3 is an aluminum substrate layer; the corrosion resistant layer 5 is a cast polypropylene layer (CPP layer). The structure can improve the extremely high barrier property, puncture resistance, electrolyte stability and electrical property (including insulation) of the composite aluminum plastic film through the support layer 1 of the nylon layer or the polyester nylon co-extrusion layer, the substrate layer 3 of the aluminum substrate layer and the corrosion resistant layer 5 of the casting polypropylene layer.

Wherein, in some embodiments, the total thickness L3 of the composite aluminum plastic film structure is 91-115 μm; the thickness of the aluminum substrate layer is 30-35 mu m; the thickness of the nylon layer or the polyester nylon co-extrusion layer is 15-20 mu m; the thickness of the casting polypropylene layer is 40-50 mu m; the thickness L1 of the first hydrophobic layer 2 is 3-5 mu m; the thickness L2 of the second hydrophobic layer 41 is 3 to 5. Mu.m. Wherein the thickness L1 of the first hydrophobic layer 2 is 3 μm, and the thickness L2 of the second hydrophobic layer 41 is 3 μm; the thickness of the aluminum base material layer is 32 mu m, the thickness of the nylon layer is 18 mu m, the CPP layer thickness is 45 mu m, and the total thickness L3 of the composite aluminum plastic film structure is 101 mu m.

Specifically, in some embodiments, as shown in fig. 3, the end surface of the supporting layer 1 is provided with a protrusion 11; the bulge 11 is arranged along the side away from the first hydrophobic layer 2 in a protruding way; and the relation between the coverage area S1 of the protrusion 11 and the area S2 of the end face of the support layer 1 satisfies: s1= (80% -100%) S2. Through the effect of the diversion liquid of the bulge 11, excessive liquid residue on the end face of the supporting layer 1 can be avoided, so that the hydrophobic protection effect is realized.

Specifically, in some embodiments, as shown in fig. 3, the projection 11 includes a first guide inclined edge 111 and a second guide inclined edge 112 that are disposed obliquely to each other; and the inclination angle α between the first guide inclined side 111 and the second guide inclined side 112 is 120 to 150 degrees. That is, the protrusion 11 is a protrusion having a triangular cross section. The residual liquid can be further guided to two sides through the bulges with relatively large included angles, so that excessive liquid can be prevented from remaining on the end face of the supporting layer 1, and the hydrophobic protection effect is realized.

The utility model also provides a battery, which comprises a composite aluminum plastic film structure, and the specific structure of the composite aluminum plastic film structure refers to the embodiment, and because the battery adopts all the technical schemes of all the embodiments, the battery at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

Wherein, a Battery (Battery) refers to a device which contains electrolyte solution and metal electrode to generate current in a cup, a groove or other container or partial space of a composite container and can convert chemical energy into electric energy; the battery has a positive electrode and a negative electrode. With the advancement of technology, batteries generally refer to small devices capable of generating electrical energy, such as solar cells. The performance parameters of the battery are mainly electromotive force, capacity, specific energy and resistance. The battery principle: in a chemical cell, the direct conversion of chemical energy into electrical energy is a result of spontaneous oxidation, reduction, etc. chemical reactions within the cell, which are carried out on two electrodes, respectively. The negative electrode active material is composed of a reducing agent having a relatively negative potential and being stable in an electrolyte, such as an active metal of zinc, cadmium, lead, or the like, and hydrogen or a hydrocarbon, or the like. The positive electrode active material is composed of an oxidizing agent which is potential-corrected and stable in the electrolyte, such as metal oxides of manganese dioxide, lead dioxide, nickel oxide, etc., oxygen or air, halogen and salts thereof, oxy-acid and salts thereof, etc. The electrolyte is a material having good ionic conductivity, such as an aqueous solution of an acid, a base, a salt, an organic or inorganic nonaqueous solution, a molten salt, a solid electrolyte, or the like.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the embodiments of the disclosure may be suitably combined to form other embodiments as will be understood by those skilled in the art.

Variations and modifications of the above embodiments will occur to those skilled in the art to which the utility model pertains from the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims

1. A composite aluminum plastic film structure is characterized in that: comprises a supporting layer, a first hydrophobic layer, a substrate layer, a second hydrophobic layer and a corrosion-resistant layer; opposite end surfaces of the substrate layer are respectively connected with the first hydrophobic layer and the second hydrophobic layer; the supporting layer is connected to the first hydrophobic layer at one side far away from the substrate layer; the corrosion-resistant layer is connected to the second hydrophobic layer on the side far away from the substrate layer.

2. The composite aluminum plastic film structure of claim 1, wherein: the first hydrophobic layer includes a first superhydrophobic adhesive component, and the first superhydrophobic adhesive component is adhered to the substrate layer.

3. The composite aluminum plastic film structure of claim 2, wherein: the first superhydrophobic adhesive component is of a first epoxy resin structure.

4. The composite aluminum plastic film structure of claim 1, wherein: the second hydrophobic layer includes a second superhydrophobic adhesive component, and the second superhydrophobic adhesive component is adhered to the substrate layer.

5. The composite aluminum plastic film structure according to claim 4, wherein: the second superhydrophobic adhesive component is of a second epoxy resin structure.

6. The composite aluminum plastic film structure according to any one of claims 1 to 5, wherein: the relation between the thickness L1 of the first hydrophobic layer and the thickness L2 of the second hydrophobic layer satisfies: l1 is less than or equal to L2.

7. The composite aluminum plastic film structure of claim 1, wherein: the relation between the thickness L1 of the first hydrophobic layer and the thickness L2 of the second hydrophobic layer and the total thickness L3 of the composite aluminum-plastic film structure satisfies the following formula: l1+l2=a×l3; wherein, A=1/16-1/10.

8. The composite aluminum plastic film structure of claim 1, wherein: the supporting layer is a nylon layer or a polyester nylon co-extrusion layer; and/or, the substrate layer is an aluminum substrate layer; and/or, the corrosion-resistant layer is a cast polypropylene layer.

9. The composite aluminum plastic film structure of claim 1, wherein: the end face of the supporting layer is provided with a bulge; the protrusions are arranged along one side away from the first hydrophobic layer in a protruding manner.

10. A battery, characterized in that: comprising a composite aluminium-plastic film structure according to any one of claims 1 to 9.