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CN117712579A - Packaging material for lithium battery, preparation method and application thereof - Google Patents

Packaging material for lithium battery, preparation method and application thereof Download PDF

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Publication number
CN117712579A
CN117712579A CN202311713724.6A CN202311713724A CN117712579A CN 117712579 A CN117712579 A CN 117712579A CN 202311713724 A CN202311713724 A CN 202311713724A CN 117712579 A CN117712579 A CN 117712579A
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CN
China
Prior art keywords
layer
packaging material
adhesive
resin layer
polyester resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311713724.6A
Other languages
Chinese (zh)
Inventor
付绪望
宋阳
范开成
李雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangzhou Foster Functional Membrane Materials Co ltd
Original Assignee
Hangzhou Foster Functional Membrane Materials Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangzhou Foster Functional Membrane Materials Co ltd filed Critical Hangzhou Foster Functional Membrane Materials Co ltd
Priority to CN202311713724.6A priority Critical patent/CN117712579A/en
Publication of CN117712579A publication Critical patent/CN117712579A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/121—Organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • 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
    • B32B27/08—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 of synthetic resin
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • 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
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • 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
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention provides a packaging material for a lithium battery, a preparation method and application thereof. The packaging material for lithium batteries comprises: the protective layer, the first adhesive layer, the base material layer and the thermoplastic resin layer are sequentially laminated; the substrate layer comprises a polyester resin layer and a plating layer arranged on the surface of the polyester resin layer. By applying the technical scheme of the invention, the packaging material for the lithium battery uses the non-conductive polyester resin layer to replace the traditional metal foil layer, no potential difference exists between the packaged packaging material and the tab metal sheet, the problem of edge voltage can be completely avoided, and meanwhile, the plating layer is arranged on the surface of the polyester resin layer, so that the barrier property of the polyester resin layer is improved, and the safety of the lithium battery is improved.

Description

Packaging material for lithium battery, preparation method and application thereof
Technical Field
The invention relates to the technical field of lithium battery packaging materials, in particular to a packaging material for a lithium battery, a preparation method and application thereof.
Background
The soft package lithium battery has the characteristics of high safety performance, low internal resistance, high cycle performance, large battery capacity, diversified design and the like, is widely applied to the field of lithium battery materials, and an external package film for the soft package lithium battery is an aluminum-plastic composite film formed by a multi-layer structure, wherein the most common basic structure of the aluminum-plastic composite film is that a protective layer, an adhesive layer, a metal foil layer and a thermoplastic resin layer are sequentially laminated from outside to inside, and due to the existence of the metal foil layer, potential difference exists between the metal foil layer and a tab metal sheet after the aluminum-plastic film is packaged, and the battery is corroded when the potential difference is overlarge (commonly called as edge voltage), so that the battery is damaged. And along with the application of energy storage power, the energy storage power battery has large capacity and high voltage, the potential difference between the metal foil layer and the tab metal sheet is easier to generate, and the battery has potential safety hazard.
Meanwhile, the packaging strength of the soft package lithium battery is one of important indexes considering the safety of the lithium battery, various materials are modified on the thermoplastic resin layer for improving the packaging strength, and when in hot-pressing packaging, the packaging temperature is usually improved for improving the packaging effect, the temperature is overhigh, the melting deformation is large, the edge voltage is easier to generate, and meanwhile, the thermoplastic resin at the packaging position is also easy to melt. However, the addition of conventional modifying materials causes the melt deformation to become large, resulting in a larger side voltage of the battery.
Disclosure of Invention
The invention mainly aims to provide a packaging material for a lithium battery, and a preparation method and application thereof, so as to solve the problem that the lithium battery in the prior art has potential safety hazards in side voltage.
In order to achieve the above object, according to one aspect of the present invention, there is provided a packaging material for a lithium battery, the packaging material comprising: the protective layer, the first adhesive layer, the base material layer and the thermoplastic resin layer are sequentially laminated; the substrate layer comprises a polyester resin layer and a plating layer arranged on the surface of the polyester resin layer.
Further, the plating layer includes any one or more of a silicon oxide plating layer and an aluminum oxide plating layer; preferably, the thickness of the plating layer is 0.01-1 mu m;
preferably, the thickness of the substrate layer is 50 to 120. Mu.m.
Further, the protective layer includes any one or both of a polyester resin film and a polyamide resin film; preferably, the thickness of the protective layer is 10 to 30 μm.
Further, the thermoplastic resin layer contains a thermoplastic elastomer, preferably a thermoplastic elastomer of any one or more of styrenes, olefins, dienes, vinyl chlorides and polyurethanes, preferably a thermoplastic elastomer having a melting point of 60 to 90 ℃, preferably a particle diameter of 0.1 to 10 μm, more preferably a number average molecular weight of 80000 to 150000.
Further, the thermoplastic resin of the thermoplastic resin layer includes any one or more of polyethylene, polypropylene, an olefin copolymer, and an acid-modified olefin copolymer; preferably, the thickness of the thermoplastic resin layer is 20 to 80. Mu.m.
Further, the first adhesive layer includes any one or more of polyurethane-based adhesives, polyester-based adhesives, ethylene copolymer-based adhesives, silicone-based adhesives, epoxy-based adhesives, and elastomer-based adhesives.
Further, a second adhesive layer is further included between the base material layer and the thermoplastic resin layer, and preferably, the second adhesive layer includes any one or more of polyurethane-based adhesives, polyester-based adhesives, ethylene copolymer-based adhesives, silicone-based adhesives, epoxy-based adhesives, and elastomer-based adhesives.
According to another aspect of the present application, there is provided a method for preparing a packaging material for a lithium battery of any one of the above, the method comprising: step S1, coating glue of a first adhesive layer on one surface of a substrate layer, drying to form the first adhesive layer, and laminating a protective layer resin film and the first adhesive layer to obtain a first laminated body; step S2, placing a thermoplastic resin layer on the surface of the substrate layer of the first laminated body opposite to the first adhesive layer, and pressing to obtain a second laminated body; and step S3, curing the second laminated body to obtain the packaging material for the lithium battery.
Further, step S2 includes: and coating glue of a second adhesive layer on the surface of the substrate layer of the first laminated body opposite to the first adhesive layer, drying to form a second adhesive layer, and pressing the thermoplastic resin layer and the second adhesive layer.
According to still another aspect of the present application, there is provided an application of the packaging material for a lithium battery or the packaging material for a lithium battery obtained by any one of the above preparation methods in a soft-pack lithium battery.
By applying the technical scheme of the invention, the packaging material for the lithium battery uses the non-conductive polyester resin layer to replace the traditional metal foil layer, no potential difference exists between the packaged packaging material and the tab metal sheet, the problem of edge voltage can be completely avoided, and meanwhile, the plating layer is arranged on the surface of the polyester resin layer, so that the barrier property of the polyester resin layer is improved, and the safety of the lithium battery is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 shows a schematic structural view of a packaging material for lithium batteries according to embodiment 1 of the present invention; and
fig. 2 shows a schematic circuit connection diagram of the voltage rating of the present invention.
Wherein the above figures include the following reference numerals: 1. a thermoplastic resin layer; 2. a second adhesive layer; 3. a polyester resin base material layer; 4. a first adhesive layer; 5. a polyamide resin film; 6. a third adhesive layer; 7. a polyester resin film.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
As analyzed in the background art of the present application, there is a problem of potential safety hazard in the side voltage of the lithium battery in the prior art, and in order to solve the problem, the present application provides a packaging material for a lithium battery, and a preparation method and an application thereof.
According to an exemplary embodiment of the present application, there is provided a packaging material for a lithium battery, including: the protective layer, the first adhesive layer, the base material layer and the thermoplastic resin layer are sequentially laminated; the substrate layer comprises a polyester resin layer and a plating layer arranged on the surface of the polyester resin layer.
The packaging material for the lithium battery uses the non-conductive polyester resin layer to replace the traditional metal foil layer, no potential difference exists between the packaging material and the tab metal sheet, the problem of edge voltage can be completely avoided, and meanwhile, a plating layer is arranged on the surface of the polyester resin layer, so that the barrier property of the polyester resin layer is improved, and the safety of the lithium battery is improved.
The plating layer provided on the surface of the base material layer may be provided on both sides of the polyester resin layer, or may be provided only on the side facing the thermoplastic resin layer.
To further increase the barrier properties of the polyester resin layer, in some embodiments of the present application, the coating comprises any one or more of a silicon oxide coating and an aluminum oxide coating. The thickness of the plating layer is preferably 0.01-1 μm, and the mechanical property and the barrier property of the substrate layer are better combined. In some preferred embodiments of the present application, the thickness of the substrate layer is 50-120 μm, and the packaging material containing the same is useful in applications. Illustratively, the substrate layer has a thickness of 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, or a range between any two.
The material constituting the protective layer may be selected from the prior art. In some embodiments of the present application, the protective layer includes any one or both of a polyester resin film and a polyamide resin film, which may perform a better protective function; preferably, the thickness of the protective layer is 10-30 mu m, and the comprehensive effect is better.
In some exemplary embodiments of the present application, the thermoplastic resin layer contains a thermoplastic elastomer, which can reduce the packaging temperature, increase the heat seal strength, and significantly improve the packaging effect of the product. The thermoplastic elastomer may be selected from the prior art, and particularly when the thermoplastic elastomer is a thermoplastic elastomer of any one or more of styrenes, olefins, dienes, vinyl chlorides and polyurethanes, the improvement in heat seal strength and packaging effect is more remarkable. It is further preferable that the melting point of the thermoplastic elastomer is 60 to 90 ℃, and the melting point of the thermoplastic elastomer is too high, and the fluidity during processing thereof is poor, and the wettability and dispersibility between the thermoplastic resin interfaces are poor, adversely affecting the uniformity and the overall strength of the thermoplastic resin layer. Preferably, the thermoplastic elastomer has a melting point of 70 to 90 ℃.
In some preferred embodiments of the present application, the thermoplastic elastomer has a particle size in the range of 0.1 to 10 μm, which can further improve the encapsulation effect. Preferably, the thermoplastic elastomer has a number average molecular weight of 80000 to 150000.
In order to better exert the effect of improving the encapsulation effect of the thermoplastic elastomer with respect to the packaging material for lithium batteries, in some embodiments of the present application, the thermoplastic elastomer accounts for 0.1wt% to 15wt%, preferably 0.1wt% to 10wt%, and more preferably 0.1wt% to 5wt% of the thermoplastic resin layer. The thermoplastic elastomers having the above characteristics may be prepared by methods known in the art, and in some embodiments of the present application are made on a coextrusion casting apparatus.
The thermoplastic resin of the above thermoplastic resin layer may be selected from the prior art without particular requirements, such as any one or more of polyethylene, polypropylene, olefin copolymer and acid-modified olefin copolymer. In some preferred embodiments of the present application, the thermoplastic resin layer has a thickness of 20 to 80 μm. Illustratively, the thermoplastic resin layer has a thickness in the range of 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, or any two thereof.
The material of the first adhesive layer described above may be selected from the prior art, and is not particularly limited. In some embodiments of the present application, the first adhesive layer includes any one or more of polyurethane adhesive, polyester adhesive, ethylene copolymer adhesive, silicone adhesive, epoxy resin adhesive and elastomer adhesive, and has a better stretch-resistant effect. Preferably, the thickness of the first adhesive layer is 3-5 μm.
In some embodiments of the present application, a second adhesive layer is further included between the substrate layer and the thermoplastic resin layer, preferably, the second adhesive layer includes any one or more of polyurethane-based adhesives, polyester-based adhesives, ethylene copolymer-based adhesives, silicone-based adhesives, epoxy-based adhesives, and elastomer-based adhesives, which have a role of small molecule corrosion resistance. Preferably, the thickness of the second adhesive layer is 3-5 μm.
The packaging material for the lithium battery can be prepared by a conventional preparation method in the prior art, and is not particularly required.
According to another exemplary embodiment of the present application, there is provided a method for preparing a packaging material for a lithium battery according to any one of the above, including: step S1, coating glue of a first adhesive layer on one of the plating surfaces of a substrate layer, drying to form the first adhesive layer, and laminating a protective layer resin film with the first adhesive layer; step S2, placing a thermoplastic resin layer on the surface of the substrate layer of the first laminated body opposite to the first adhesive layer, and pressing to obtain a second laminated body; and step S3, curing the second laminated body to obtain the packaging material for the lithium battery.
According to the preparation method, the non-conductive polyester resin layer is used for replacing the traditional metal foil layer, no potential difference exists between the packaging material for the lithium battery and the tab metal sheet after the packaging material is packaged, the problem of edge voltage can be completely avoided, meanwhile, a plating layer is arranged on the surface of the polyester resin layer, the barrier property of the polyester resin layer is improved, and the safety of the lithium battery is improved.
In some embodiments of the present application, step S2 includes: and coating glue of a second adhesive layer on the surface of the substrate layer of the first laminated body opposite to the first adhesive layer, drying to form a second adhesive layer, and pressing the thermoplastic resin layer and the second adhesive layer.
The drying temperature and time in the steps S1 and S2 may be determined according to the type and thickness of the adhesive selected, and in some embodiments of the present application, the drying temperature in the step S1 is 80-150 ℃, and the drying temperature in the step S2 is 110-180 ℃, so that the obtained packaging material has higher strength and better comprehensive performance. In some embodiments of the present application, in the step S3, the curing temperature is 50-80 ℃ and the curing time is 3-7 days, which helps to further improve the service performance of the material.
According to yet another exemplary embodiment of the present application, there is provided a use of any of the above-described packaging materials for lithium batteries in soft-pack lithium batteries.
The advantages that can be achieved by the present application will be further described below in connection with examples and comparative examples.
Example 1
The present embodiment provides a packaging material for lithium batteries, the schematic structural diagram of which is shown in fig. 1, comprising a thermoplastic resin layer 1, a second adhesive layer 2, a polyester resin base material layer 3, a first adhesive layer 4, a polyamide resin film 5, a third adhesive layer 6, and a polyester resin film 7, which are laminated in this order, wherein the polyester resin base material layer 3 has an alumina-plated layer in contact with the first adhesive layer 4.
The preparation method comprises the following steps:
(a) Coating polyurethane glue (Toyo-spinning RV 550) on one surface of an alumina-coated layer (single-surface coated alumina layer, coating thickness of 0.1-1 μm) of a polyester resin substrate (80 μm) layer 3, oven drying at 80 ℃ to form a first bonding layer 4, and compounding a polyamide FILM (KOHJIN FILM RX-FW) 5 with thickness of 15 μm with the first bonding layer 4 by a compression roller;
(b) Coating polyurethane glue (Toyo-spinning RV 550) on the laminated polyamide film, drying in an oven at 80 ℃ to form a third bonding layer 6, and compositing a polyester resin film 7 with the thickness of 6 mu m and the third bonding layer 6 through a compression roller;
(c) Coating acrylic glue (Toyo PMA-T) on the other side of the polyester resin substrate layer 3, drying in an oven at 110 ℃ to form a second bonding layer 2, and compounding a polypropylene film, namely a thermoplastic resin layer 1, which is 80 mu m in thickness and added with 5wt% of low-melting thermoplastic olefin elastomer (the melting point is 80 ℃, the particle size is 1 mu m and the molecular weight is 100000) with the second bonding layer 2 through a compression roller;
(d) Curing the laminated body for 6 days at 60 ℃ to obtain the novel lithium battery flexible package aluminum-plastic composite film shown in figure 1.
Example 2
The difference from example 1 is that the thickness of the polyester resin base material layer 3 was 50 μm.
Example 3
The difference from example 2 is that the thickness of the polyester resin base material layer was 120 μm.
Example 4
The difference from example 1 is that the thickness of the thermoplastic resin layer 1 is 50 μm.
Example 5
The difference from example 2 is that the thickness of the thermoplastic resin layer 1 is 50 μm.
Example 6
The difference from example 2 is that the thickness of the thermoplastic resin layer 1 is 20 μm.
Example 7
The difference from example 1 is that the packaging material for lithium battery does not contain the third adhesive layer 6 and the polyester resin film 7, and in the corresponding production method, step (b) is skipped.
Example 8
The difference from example 6 is that the polyamide film was replaced with a polyester resin film (SK SKYBON ES-370US polyester film) of the same thickness.
Example 9
The difference from example 1 is that the surface plating layer of the polyester resin base material layer 3 in the step (a) is a silicon oxide plating layer, and the thickness of the plating layer is 0.5 μm.
Example 10
The difference from example 1 is that the polyester resin base material layer 3 has an alumina-plated layer in contact with the second adhesive layer 2 and the first adhesive layer 4.
Example 11
The difference from example 1 is that in step (c), the polypropylene film is free of a low melting thermoplastic polyolefin elastomer.
Example 12
The difference from example 1 is that in the step (c), the thermoplastic elastomer added to the polypropylene film is an olefinic thermoplastic elastomer, the melting point is 70 ℃, the particle size is 0.5 μm, and the molecular weight is 120000.
Example 13
The difference from example 1 is that in the step (c), the thermoplastic elastomer added to the polypropylene film is a polyurethane-based thermoplastic elastomer, the melting point is 110 ℃, the particle size is 10 μm, and the molecular weight is 94000.
Example 14
The difference from example 1 is that in the step (c), the thermoplastic elastomer added to the polypropylene film is an ethylene-octene based thermoplastic elastomer (Exxon Mobil), the melting point is 99 ℃, the particle size is 0.5 μm, and the molecular weight is 150000.
Example 15
The difference from example 1 is that the content of the thermoplastic olefin-based elastomer is 0.1% by weight.
Example 16
The difference from example 1 was that the content of the thermoplastic olefin-based elastomer was 2.5% by weight.
Example 17
The difference from example 1 is that the content of the thermoplastic olefin-based elastomer is 8% by weight.
Example 18
The difference from example 1 is that the content of the thermoplastic olefin-based elastomer is 10% by weight.
Comparative example 1
The soft package aluminum-plastic composite film of the lithium battery is prepared by the following method:
(a) Coating the inner and outer surfaces of an aluminum foil layer having a thickness of 50 μm with a chromate treatment solution (solid mass fraction of about 3%), oven-drying at 180deg.C to form a metal foil layer having a chromium content of 10mg/m on both surfaces 2 Is a chemical treatment layer of (a);
(b) Coating polyurethane glue on one side of the metal foil layer, drying in an oven at 80 ℃ to form a bonding layer, and compositing a polyamide film with the thickness of 15um with the bonding layer through a compression roller;
(c) Coating polyurethane glue on the laminated polyamide film, drying in an oven at 80 ℃ to form a bonding layer, and compositing a 6 mu m polyester resin film and the bonding layer through a compression roller;
(d) Coating acrylic glue (Toyobo PMA-T) on the other side of the metal foil layer, drying in a baking oven at 110 ℃, and compositing a polypropylene film with the thickness of 80 mu m with the bonding layer 2 through a compression roller;
(e) And curing the laminated body for 6 days at the temperature of 60 ℃ to obtain the lithium battery flexible package aluminum-plastic composite film.
Comparative example 2
The difference from comparative example 1 is that the polypropylene film has a thickness of 50. Mu.m.
The lithium battery packaging materials prepared in the above examples and comparative examples were subjected to evaluation of side voltage, packaging strength, and unpackaged position as follows.
Comparative example 3
The difference from example 1 is that in step (a), both surfaces of the polyester resin base material layer 3 are not plated.
Evaluation method 1: evaluation of side Voltage
1260110 cells (voltage 3.7V,10000 mA) are manufactured by using the novel packaging material for the lithium battery, the cells are manufactured according to the manufacturing flow of the lithium battery cells (shell punching, top side sealing, baking, liquid injection, formation and secondary sealing), 1000 cells are manufactured by using each material, and the manufactured cells are tested by using a universal meter for the edge voltage of the edges of the negative electrode of the cell and the edges of the material two, as shown in figure 2.
Preferably: testing 1000 battery core side voltages to be 0V;
good: testing 1000 cell side voltages, wherein the cell side voltages are less than 10 and less than 0.6V;
the difference is: testing 1000 cell side voltages, more than 10 cell side voltages less than 0.6V, or cell side voltages more than 0.6V; evaluation method 2: evaluation of packaging Strength
The novel packaging material for the lithium battery is cut into a sample with the thickness of 80Mm (MD) multiplied by 60mm (TD), the sample is folded inwards along the MD direction and the CPP layer, a heat sealing machine is used for heat sealing along the TD direction, the heat sealing deformation of a polypropylene film is 30% by controlling the temperature, the heat sealing strength is tested under the same heat sealing deformation, the heat sealing strength test is carried out according to QB/T2358-1998 regulation, the sample is opened to be in a T shape by taking the heat sealing position as the center, two ends of the sample are clamped on a tension machine clamp, the axis of the sample coincides with the center line of an upper clamp and the center line of a lower clamp, the clamp distance is 50mm, the stretching speed is (300+/-20) mm/min, and after the sample is completely stripped, the maximum load in the stretching process is read to be the heat sealing strength of the sample.
Preferably: the heat sealing strength is more than or equal to 120N/15mm.
Good: the heat sealing strength is more than or equal to 80N/15mm.
The difference is: the heat sealing strength is less than 80N/15mm.
Evaluation method 3: packaging at high temperature, evaluation of unpackaged position
Cutting the novel packaging material for the lithium battery into a sample with the thickness of 80Mm (MD) multiplied by 60mm (TD), folding the sample inwards along the MD direction and the CPP layer, heat-sealing the sample along the TD direction by using a heat sealing machine, controlling the heat-sealing temperature to ensure that the heat-sealing deformation of the polypropylene film is 50%, manually tearing the unencapsulated position of the polypropylene film, and observing whether the inner layer has adhesive force and whitening condition;
preferably: the unpackaged position has no adhesive force and no blushing.
Good: the unpackaged locations had slight adhesion and no blushing.
The difference is: the unpackaged locations had adhesive and slightly blunted.
The comparative results are shown in table 1 below:
TABLE 1
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the packaging material for the lithium battery uses the non-conductive polyester resin layer to replace the traditional metal foil layer, no potential difference exists between the packaging material and the tab metal sheet, the problem of edge voltage can be completely avoided, and meanwhile, a plating layer is arranged on the surface of the polyester resin layer, so that the barrier property of the polyester resin layer is improved, and the safety of the lithium battery is improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A packaging material for a lithium battery, comprising: the protective layer, the first adhesive layer, the base material layer and the thermoplastic resin layer are sequentially laminated; the substrate layer comprises a polyester resin layer and a plating layer arranged on the surface of the polyester resin layer.
2. The packaging material for lithium batteries according to claim 1, wherein the plating layer comprises any one or more of a silicon oxide plating layer and an aluminum oxide plating layer; preferably, the thickness of the plating layer is 0.01-1 μm;
preferably, the thickness of the base material layer is 50 to 120 μm.
3. The packaging material for lithium batteries according to claim 1, wherein the protective layer comprises any one or both of a polyester resin film and a polyamide resin film;
preferably, the thickness of the protective layer is 10 to 30 μm.
4. The packaging material for lithium batteries according to claim 1, wherein said thermoplastic resin layer contains a thermoplastic elastomer, preferably said thermoplastic elastomer is a thermoplastic elastomer of any one or more of styrene-based, olefin-based, diene-based, vinyl chloride-based and polyurethane-based, preferably said thermoplastic elastomer has a melting point of 60 to 90 ℃, preferably said thermoplastic elastomer has a particle diameter in the range of 0.1 to 10 μm, more preferably said thermoplastic elastomer has a number average molecular weight of 80000 to 150000.
5. The packaging material for lithium batteries according to claim 1, wherein the thermoplastic resin of said thermoplastic resin layer comprises any one or more of polyethylene, polypropylene, olefin copolymer and acid-modified olefin copolymer;
preferably, the thickness of the thermoplastic resin layer is 20 to 80 μm.
6. The packaging material for lithium batteries according to claim 1, wherein the first adhesive layer comprises any one or more of a polyurethane-based adhesive, a polyester-based adhesive, an ethylene copolymer-based adhesive, a silicone-based adhesive, an epoxy-based adhesive, and an elastomer-based adhesive.
7. The packaging material for lithium batteries according to any one of claims 1 to 6, further comprising a second adhesive layer between the base material layer and the thermoplastic resin layer, preferably, the second adhesive layer comprises any one or more of a polyurethane-based adhesive, a polyester-based adhesive, an ethylene copolymer-based adhesive, a silicone-based adhesive, an epoxy-based adhesive, and an elastomer-based adhesive.
8. A method for producing the packaging material for lithium batteries according to any one of claims 1 to 7, characterized by comprising:
step S1, coating glue of a first adhesive layer on one surface of a substrate layer, drying to form the first adhesive layer, and laminating a protective layer resin film and the first adhesive layer to obtain a first laminated body;
step S2, placing a thermoplastic resin layer on the surface of the substrate layer of the first laminated body opposite to the first adhesive layer, and pressing to obtain a second laminated body;
and step S3, curing the second laminated body to obtain the packaging material for the lithium battery.
9. The method according to claim 8, wherein the step S2 comprises: and coating glue of a second adhesive layer on the surface, opposite to the first adhesive layer, of the substrate layer of the first laminated body, drying to form the second adhesive layer, and pressing the thermoplastic resin layer and the second adhesive layer.
10. Use of the packaging material for lithium batteries according to any one of claims 1 to 7 or obtained according to the preparation method of any one of claims 8 to 9 in soft-pack lithium batteries.
CN202311713724.6A 2023-12-12 2023-12-12 Packaging material for lithium battery, preparation method and application thereof Pending CN117712579A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311713724.6A CN117712579A (en) 2023-12-12 2023-12-12 Packaging material for lithium battery, preparation method and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311713724.6A CN117712579A (en) 2023-12-12 2023-12-12 Packaging material for lithium battery, preparation method and application thereof

Publications (1)

Publication Number Publication Date
CN117712579A true CN117712579A (en) 2024-03-15

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Country Status (1)

Country Link
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