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CN111976175A - Preparation method of aluminum-plastic film for battery and aluminum-plastic film - Google Patents

Preparation method of aluminum-plastic film for battery and aluminum-plastic film Download PDF

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Publication number
CN111976175A
CN111976175A CN202010750785.XA CN202010750785A CN111976175A CN 111976175 A CN111976175 A CN 111976175A CN 202010750785 A CN202010750785 A CN 202010750785A CN 111976175 A CN111976175 A CN 111976175A
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Prior art keywords
layer
aluminum
aluminum foil
plastic film
film
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Pending
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CN202010750785.XA
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Chinese (zh)
Inventor
周婷
梁昌盛
晁承鹏
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Jiangyi Suda Huicheng Composite Material Co ltd
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Jiangyi Suda Huicheng Composite Material Co ltd
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Priority to CN202010750785.XA priority Critical patent/CN111976175A/en
Publication of CN111976175A publication Critical patent/CN111976175A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/10—Batteries

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a preparation method of an aluminum-plastic film for a battery and the aluminum-plastic film; step 1: pretreating an aluminum foil; taking an aluminum foil raw material, and passivating the aluminum foil raw material; step 2: compounding the outer layer; taking the aluminum foil material of the aluminum foil layer treated in the step (1) and the raw material of the outer layer, coating a proper amount of glue between the aluminum foil material and the raw material of the outer layer, and compounding to form an outer layer binder layer between the outer layer and the aluminum foil layer; forming a composite film consisting of an outer layer, an outer layer binder layer and an aluminum foil layer; and step 3: taking the composite film formed in the step 2, and carrying out film spraying on the inner layer of the aluminum foil layer to form an inner layer 4; and 4, step 4: heating to form an aluminum plastic film product for the battery; in the step 4, the heating is to perform non-contact heating on the film by adopting an electromagnetic induction heating mode. The invention adopts electromagnetic induction heating, greatly reduces heating power, particularly preheating and heating time and energy consumption, and reduces energy consumption.

Description

Preparation method of aluminum-plastic film for battery and aluminum-plastic film
Technical Field
The invention relates to a preparation method of an aluminum-plastic film for battery external wrapping and the aluminum-plastic film formed by the preparation method.
Background
In the production process of the lithium ion battery, the electrolyte needs to be sealed and packaged through a packaging film to form a battery pack; at present, an aluminum plastic film is generally adopted as a packaging material of a battery, and the aluminum plastic film has high requirements on strength and toughness of the material and has requirements on liquid resistance. At present, in order to improve the energy density of the lithium ion battery, the aluminum-plastic film needs to be punched with pits, and the mechanical performance brought by the punching depth performance of the aluminum-plastic film has higher requirements.
When the existing aluminum-plastic film product is applied to occasions with high requirements on punching depth performance, such as high multiplying power and electronic cigarettes, the phenomenon of whitening of the punching depth often occurs, and the reason for the whitening is that the toughness of the aluminum-plastic film is improved due to insufficient toughness, so that the method is a target always pursued by current manufacturers; for example, the Chinese patent publication No. CN111116875A discloses a high-toughness stamping-resistant polyester resin for compounding aluminum plastic films of lithium batteries, namely, the toughness is improved through the improvement of a formula process; the Chinese patent publication No. CN108565383A discloses a high-toughness lithium battery diaphragm and a preparation method thereof, and toughness is enhanced by specially arranging a high-toughness layer material.
However, how to reasonably adjust the preparation method is also the direction in which enterprises need efforts, besides improving the mechanical properties of the raw materials.
The invention aims to adopt the prior conventional raw materials and improve the preparation method to obtain the aluminum plastic film with more excellent drawing toughness; meanwhile, through the improvement of the preparation method, the production energy consumption is reduced, and the production efficiency is improved.
Disclosure of Invention
The invention aims to provide a preparation method of an aluminum-plastic film for a battery and the aluminum-plastic film, so as to improve the punching toughness of the aluminum-plastic film.
In order to achieve the above object, a first aspect of the present invention provides a method for preparing an aluminum plastic film for a battery, comprising the steps of:
step 1: pretreating an aluminum foil; taking an aluminum foil raw material, and passivating the aluminum foil raw material;
step 2: compounding the outer layer; taking the aluminum foil material of the aluminum foil layer treated in the step (1) and the raw material of the outer layer, coating a proper amount of glue between the aluminum foil material and the raw material of the outer layer, and compounding to form an outer layer binder layer between the outer layer and the aluminum foil layer; forming a composite film consisting of an outer layer, an outer layer binder layer and an aluminum foil layer;
and step 3: taking the composite film formed in the step 2, and carrying out film spraying on the inner layer of the aluminum foil layer to form an inner layer 4;
and 4, step 4: heating to form an aluminum plastic film product for the battery;
in the step 4, the heating is to perform non-contact heating on the film by adopting an electromagnetic induction heating mode.
As a further improvement of the invention, in the step 4, an electromagnetic induction heater is adopted for electromagnetic induction heating, and non-contact ultrasonic induction heating is carried out.
Further, more than 2 sets of electromagnetic induction heaters are adopted for electromagnetic induction heating in the step 4; and the electromagnetic induction heaters gradually increase the electromagnetic induction power and gradually increase the temperature and heat along the moving direction of the film.
In a second aspect of the invention, an aluminum plastic film for a battery is provided, which is produced by adopting the steps; wherein,
the outer layer is made of PA, and the thickness is 15-30 um;
the aluminum foil layer is made of aluminum foil with the thickness of 30-55 um;
the outer layer adhesive layer is made of dry glue and has the thickness of 4-6 um;
the inner layer is made of PP, and the thickness of the inner layer is 30-85 um.
As a further improvement of the invention, the inner layer PP material is added with an elastomer.
Further, the inner layer adopts more than 2 layers of laminating films; the innermost layer is a heat-seal bonding layer, and the thickness is 5-50 um; 2-40% of elastomer is added in the film material adjacent to the heat-seal bonding layer, and the thickness is 5-50 um.
Further, the inner layer adopts 3 layers of laminating films;
an adhesive layer is arranged close to the aluminum foil layer, the material is PPA, and the thickness is 5-30 um;
the middle layer is a supporting layer made of PPB (polypropylene-based) and has the thickness of 5-40 um;
the innermost side is a heat-seal bonding layer made of PPC with the thickness of 5-30 um;
2% -20% of elastomer is added into the supporting layer.
As a further improvement of the invention, the electromagnetic induction heating of step 4 adopts 3 sets of electromagnetic induction heaters; along the moving direction of the film, the heating output powers of the 3 sets of electromagnetic induction heaters are 5kw, 7kw and 10kw respectively.
Further, the elastomer is a polyolefin elastomer material.
Still further, the inner layer PP material combined with the aluminum foil layer is modified PP, and the modified PP is made of polypropylene grafted and modified by one or more than two monomers of acrylic acid, methacrylic acid, maleic anhydride, alpha-methacrylic acid, methyl methacrylate and glycidyl methacrylate.
According to the preparation method of the aluminum-plastic film for the battery and the aluminum-plastic film, the toughness of the inner layer material is improved by adopting the improved inner layer film structure and adding a proper amount of elastomer; meanwhile, electromagnetic induction heating is adopted, so that the heating efficiency is improved; the induction heating mode directly generates heat on the surface of the aluminum foil layer, so that the heating is more efficient, the bonding between the inner layer and the aluminum foil layer is more reliable, and the influence on the material of the inner layer is smaller; by adopting the induction heating mode, the film moves at high speed and does not contact with the heater, namely, the contact of the film in a high-temperature state is reduced, so that the scratch on the surface of the film is effectively avoided, and the surface quality of the product is further improved.
Compared with the prior art, the preparation method of the aluminum-plastic film for the battery and the aluminum-plastic film thereof have the following advantages:
(1) the structure of the raw materials is not changed, and the structure of the aluminum-plastic film is reliable;
(2) the electromagnetic induction heating is adopted, so that the heating power is greatly reduced, particularly the preheating time and energy consumption are reduced, and the energy consumption is reduced;
(3) the deep punching performance of the prepared film is improved, and the use requirement is better met.
Drawings
FIG. 1 is a schematic view of a laminated structure of an aluminum plastic film according to the present invention;
FIG. 2 is a schematic production diagram of the heating step of the present invention;
reference numerals: 1, an outer layer; 2, an aluminum foil layer; 3, an outer adhesive layer; 4, an inner layer; 5, compounding a film;
11, a transition roll; 12, a membrane spraying head; 13, a film spraying roller; 14, a guide roller; 15, a heater.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
As shown in fig. 1, which is a schematic view of a laminated structure of an aluminum-plastic film, the laminated structure sequentially comprises an outer layer 1, an outer layer adhesive layer 3, an aluminum foil layer 2, and an inner layer 4 from outside to inside.
Outer layer 1: PA, polyamide, nylon for short, with a thickness of 15-30um, preferably 25 um;
aluminum foil layer 2: aluminum foil with thickness of 30-55um, preferably 40 um;
outer layer adhesive layer 3: dry glue with thickness of 4-6um, preferably 5 um;
inner layer 4: PP, polypropylene, with a thickness of 30-85um, preferably 43 um.
The aluminum-plastic film is prepared by the following steps:
step 1: pretreating an aluminum foil; taking an aluminum foil raw material, passivating the aluminum foil raw material by adopting modes of spraying, dipping, coating and the like and passivating the aluminum foil by using a passivating reagent, so that the electrolyte resistance and the bonding property of the aluminum foil are improved;
step 2: compounding the outer layer; coating a proper amount of dry glue between the aluminum foil material of the aluminum foil layer 2 treated in the step (1) and the raw material of the outer layer 1, and compounding to form an outer-layer binder layer 3 between the outer layer 1 and the aluminum foil layer 2; forming a composite film 5;
and step 3: taking the composite film 5 formed in the step 2, and carrying out film spraying on the inner layer of the aluminum foil layer 2 to form an inner layer 4;
and 4, step 4: heating to form the aluminum plastic film.
The innovation point of the invention is that in the heating in the step 4, an electromagnetic induction heating mode is specifically adopted for heating and curing; specifically, as shown in fig. 2, the composite film 5 is introduced into a film-coating station from a transition roller 11, and after the raw material of the inner layer 4 is heated by a film-coating head 12, the raw material is uniformly coated on the inner layer surface of the aluminum foil layer 2 of the composite film 5 in the form of an inner layer film-coating liquid 4'; inputting the materials into a laminating roller 13 together for rolling and preforming; finally, the film is passed over a zone of heaters 15 by means of guide rollers 14 and heated. Specifically, the heater 15 is an electromagnetic induction heater, a superaudio induction heating power supply is adopted, and the heating mode is non-contact, so that the surface of a product cannot be damaged; the input power of the electromagnetic induction heater is 10-100kw and can be adjusted, and then the heating output power is adjusted.
In order to improve the heating efficiency, the electromagnetic induction heater is provided with a plurality of groups; as shown in fig. 2, the heater 15 adopts three sets of electromagnetic induction heaters to heat the film in a stepped manner, and finally, the temperature is raised to 170 ℃ or higher, so that efficient heating is realized.
The heating production process is different from the conventional process using thermal equipment, and has the characteristics of simple equipment, high safety, low energy consumption and the like. Meanwhile, the occupied space of the equipment is small, the temperature rise time of a hot roller is not needed, and the time is saved.
The existing hot method process generally uses a plurality of hot rollers to heat the aluminum plastic film, the hot rollers are heated to a higher temperature, the required time is longer, the occupied space of the hot rollers is larger, once glue overflow occurs, the glue is difficult to clean, personnel scald is easy to cause, and the danger is larger. The invention adopts electromagnetic induction heating, can reach the set temperature within a plurality of seconds, and has short required time, low energy consumption and high safety.
Further, in the step 3, the inner layer 4 is formed by laminating the inner side of the aluminum foil layer 2, and specifically:
(1) carrying out single-layer film coating, namely adding an elastomer to toughen the PPA by adopting PPA, and carrying out film coating;
(2) the double-layer laminating film is PPA close to the aluminum foil layer 2, has the thickness of 5-50um and plays a role in bonding; the innermost side is PPB, the thickness is 5-50um, and the heat sealing and bonding effects are achieved; the elastomer can be added into the PPA layer or the PPB layer or both the PPA layer and the PPB layer;
(3) the three layers of laminating films are PPA (polyphthalamide) close to the aluminum foil layer 2, are 5-30um thick and have a bonding effect; the middle layer is PPB with the thickness of 5-40um and plays a supporting role; the innermost side is PPC with the thickness of 5-30um, which plays a role in heat sealing and bonding; wherein, the elastomer can be added into one layer, two layers or three layers.
And the formula can be better regulated and controlled by adopting more layers, so that the performance of the aluminum-plastic film is better and excellent.
The elastomer is added into the PP material to improve the punching toughness of the material, and meanwhile, the heat sealing performance and the liquid resistance of the material are not influenced by the addition of the elastomer.
The used elastomer is a polyolefin elastomer, has excellent compatibility with polypropylene, and can improve the punching depth toughness of the aluminum plastic film and prevent whitening; the addition proportion of the elastomer is 2-40%.
The PPA, PPB and PPC are used to distinguish PP layers of different layers in the same embodiment.
The PPA layer is combined with the aluminum foil layer 2 as required, and in order to increase the combination viscosity, the material of the PPA layer is modified PP, and is specifically made of polypropylene grafted and modified by one or more than two monomers of acrylic acid, methacrylic acid, maleic anhydride, alpha-methacrylic acid, methyl methacrylate and glycidyl methacrylate.
Therefore, when the inner layer 4 adopts a three-layer laminating structure, the bonding layer PPA close to the aluminum foil layer is modified PP, so that the bonding layer PPA can be more firmly combined with the aluminum foil layer 2; the middle layer is a supporting layer, and an elastomer is added into the selected PPB to increase the punching toughness; the innermost side is the heat-seal tie coat, and PPC is ordinary PPC, improves heat-seal adhesive property. The three layers of laminating films are made of different materials, so that the comprehensive improvement of the performance of the inner layer 4 is realized.
Examples of the invention
Figure BDA0002609988540000051
Comparative example, production Process Using conventional roller heating
Figure BDA0002609988540000052
Testing of performance of aluminum plastic film
And (4) carrying out performance test on the finished product aluminum plastic film, and mainly testing the punching depth, the peeling strength and the heat sealing strength.
The test of the peeling strength and the heat sealing strength refers to the standard of aluminum-plastic composite film for lithium ion batteries T/CIAPS0001-2018 of the society of chemical and physical power supply industries of China.
The depth of penetration test refers to the standard of my department enterprise of aluminum plastic film for lithium batteries-EL 113Q/320281 HND 01-2018.
And (3) performance test comparison:
Figure BDA0002609988540000061
and (4) conclusion: as can be seen from the performance test, the comprehensive performance of the aluminum-plastic film formed by heating and producing in the heating mode of the invention is basically consistent with the performance of the existing product; but the preheating time of the heating device is greatly shortened, and the heating efficiency and the production efficiency are obviously improved.
Compared with the embodiment 3, the comparative example 2 has the advantages that a certain elastomer is added in the inner layer 4, so that the same punching depth can be kept, and the electromagnetic induction heating can achieve the same effect as that of heating by a hot roller;
in example 3, the addition amount of the elastomer in the PPB of the inner layer 4 intermediate layer is adjusted, and the addition amount of the elastomer is 10%, so that the drawing depth is improved better (compared with comparative example 3, the drawing depth is improved by 36%, and compared with comparative example 2, the drawing depth is improved by 15%), and the use requirement is better met.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The preparation method of the aluminum-plastic film for the battery is characterized by comprising the following preparation steps:
step 1: pretreating an aluminum foil; taking an aluminum foil raw material, and passivating the aluminum foil raw material;
step 2: compounding the outer layer; taking the aluminum foil material of the aluminum foil layer treated in the step (1) and the raw material of the outer layer, coating a proper amount of glue between the aluminum foil material and the raw material of the outer layer, and compounding to form an outer layer binder layer between the outer layer and the aluminum foil layer; forming a composite film consisting of an outer layer, an outer layer binder layer and an aluminum foil layer;
and step 3: taking the composite film formed in the step 2, and carrying out film spraying on the inner layer of the aluminum foil layer to form an inner layer 4;
and 4, step 4: heating to form an aluminum plastic film product for the battery;
in the step 4, the heating is to perform non-contact heating on the film by adopting an electromagnetic induction heating mode.
2. The method for preparing an aluminum plastic film for a battery according to claim 1, wherein the electromagnetic induction heating in step 4 is performed by a non-contact ultrasonic induction heating using an electromagnetic induction heater.
3. The method for preparing an aluminum-plastic film for a battery according to claim 2, wherein in the step 4, more than 2 sets of electromagnetic induction heaters are used for electromagnetic induction heating; and the electromagnetic induction heaters gradually increase the electromagnetic induction power and gradually increase the temperature and heat along the moving direction of the film.
4. An aluminum-plastic film for a battery, which is produced by the steps of claims 1 to 3; wherein,
the outer layer is made of PA, and the thickness is 15-30 um;
the aluminum foil layer is made of aluminum foil with the thickness of 30-55 um;
the outer layer adhesive layer is made of dry glue and has the thickness of 4-6 um;
the inner layer is made of PP, and the thickness of the inner layer is 30-85 um.
5. The aluminum-plastic film for batteries according to claim 4, wherein an elastomer is added in the inner PP material.
6. The aluminum-plastic film for the battery according to claim 5, wherein the inner layer is formed by more than 2 layers of laminating films; the innermost layer is a heat-seal bonding layer, and the thickness is 5-50 um; 2-40% of elastomer is added in the film material adjacent to the heat-seal bonding layer, and the thickness is 5-50 um.
7. The aluminum-plastic film for the battery according to claim 6, wherein the inner layer is a 3-layer laminated film;
an adhesive layer is arranged close to the aluminum foil layer, the material is PPA, and the thickness is 5-30 um;
the middle layer is a supporting layer made of PPB (polypropylene-based) and has the thickness of 5-40 um;
the innermost side is a heat-seal bonding layer made of PPC with the thickness of 5-30 um;
2% -20% of elastomer is added into the supporting layer.
8. The aluminum-plastic film for battery of claim 7, wherein the electromagnetic induction heating of step 4 is performed by using 3 sets of electromagnetic induction heaters; along the moving direction of the film, the heating output powers of the 3 sets of electromagnetic induction heaters are 5kw, 7kw and 10kw respectively.
9. The aluminum-plastic film for batteries according to any one of claims 5 to 7, wherein the elastomer is a polyolefin elastomer material.
10. The aluminum-plastic film for batteries according to any one of claims 6 and 7, wherein the inner layer PP material bonded to the aluminum foil layer is modified PP made of polypropylene graft-modified with one or more monomers of acrylic acid, methacrylic acid, maleic anhydride, alpha-methacrylic acid, methyl methacrylate and glycidyl methacrylate.
CN202010750785.XA 2020-07-30 2020-07-30 Preparation method of aluminum-plastic film for battery and aluminum-plastic film Pending CN111976175A (en)

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