Preparing method for aluminum plastic film for lithium battery packaging

A technology for aluminum-plastic film and packaging, which is applied in the field of preparation of aluminum-plastic film for lithium battery packaging, and can solve problems such as volatile environments, high production costs, and lithium battery leakage

Inactive Publication Date: 2017-06-09
SUZHOU DUCHAMPS ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above two methods have the following problems: the adhesive used in the dry composite method contains a large amount of organic solvents, which are extremely volatile and cause environmental pollution, and once the electrolyte penetrates through the inner layer material during the use of lithium batteries, strong corrosion The electrolyte will decompose the adhesive, and then corrode the aluminum foil and the outer material, causing the lithium battery to leak
However, thermal compounding requires multiple membrane material guiding devices and a complicated membrane preheating process. The process is complicated, which increases production costs and prolongs the production cycle.
In addition, whether it is dry lamination or thermal lamination, ready-made inner and outer film layers need to be purchased separately, so the production cost is relatively high
[0005] In view of the above technical problems, the Chinese invention patent CN104241556 discloses a kind of aluminum-plastic film for flexible packaging of lithium batteries produced by a new multi-layer co-extrusion casting technology. Homopolypropyl

Method used

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  • Preparing method for aluminum plastic film for lithium battery packaging
  • Preparing method for aluminum plastic film for lithium battery packaging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A preparation method of an aluminum-plastic film for lithium battery packaging, comprising the steps of:

[0072] 1. Select a soft aluminum foil with a thickness of 40 microns. First, perform degreasing and annealing treatment to remove the grease on the surface of the aluminum foil; then use chromium phosphate, chromium nitrate, etc. to perform conversion treatment to improve the corrosion resistance of the aluminum foil; finally use silane coupling The aluminum foil is treated with an agent to improve the bonding performance of the aluminum foil; the treated aluminum foil is passed between a rubber roller and a cooling roller, and the outer layer is cast and co-extruded to form a film;

[0073]2. Put nylon 6 and ethylene-methyl acrylate copolymer into the A screw and B screw of the two-layer co-extrusion sheet unit respectively, and control the temperature at 170-280°C; make the ethylene-methyl acrylate copolymer extruded by the B screw The material faces the side of ...

Embodiment 2

[0078] The treatment process of the aluminum foil layer is the same as in Embodiment 1.

[0079] The aluminum foil layer and the outer layer are composited by a multi-layer co-extrusion casting process, the method is the same as in Example 1, and the set conditions are shown in Table 1.

[0080] The aluminum foil layer and the inner layer are compounded by a dry compounding process. The other side of the aluminum foil that has been co-extruded and cast on the outer layer is sprayed or scraped with a layer of polyurethane adhesive, which is directly laminated and bonded with the cast polypropylene film CPP.

[0081] The above-mentioned aluminum-plastic film is subjected to post-processing, and laminated by two lamination rollers to further bond the layers of the aluminum-plastic film.

[0082] Finished product S2 is obtained by cooling, pulling, and coiling the bonded aluminum-plastic film.

Embodiment 3

[0084] The treatment process of the aluminum foil layer is the same as in Embodiment 1.

[0085] The aluminum foil layer and the outer layer are composited by a multi-layer co-extrusion casting process, the method is the same as in Example 1, and the set conditions are shown in Table 1.

[0086] The aluminum foil layer and the inner layer are compounded by a thermal compounding process. The ethylene-acrylic acid copolymer is added to the single-screw extruder, and the temperature of the screw extruder is controlled at 170-250°C, and the aluminum foil on the opposite side of the outer layer is directly melted and extruded. Between the cast polypropylene film CPP, the inner layer is hot-pressed and laminated.

[0087] The above-mentioned aluminum-plastic film is subjected to post-processing, and laminated by two lamination rollers to further bond the layers of the aluminum-plastic film.

[0088] Finished product S3 is obtained by cooling, pulling, and coiling the bonded aluminu...

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Abstract

The invention discloses a preparing method for an aluminum plastic film for lithium battery packaging. The method comprises the following steps that firstly, an outer layer material and a first bonding material are added in a screw A and a screw B of a two-layer co-extrusion sheet unit and are melted and co-extruded in a screw extruder to be in tape casting to one side of aluminum foil to become a film; secondly, an inner layer material and a second bonding material are added in the screw A and the screw B of the two-layer co-extrusion sheet unit and are melted and co-extruded in the screw extruder to be in tape casting to the other side of the aluminum foil to become a film; and then the aluminum plastic film for lithium battery packaging can be obtained. The outer layer material or the inner layer material is melted and co-extruded to be in tape casting to the surface of the aluminum foil to become the film in the screw extruder melting, co-extrusion and tape casting manner; the outer layer material (or the inner layer material) in the molten state and the bonding material can seep into each other among the layers, and when the outer layer material (or the inner layer material) and the bonding material are in tape casting to the surface of the aluminum foil to be laminated, interlayer bonding is firmer, and the interlayer bonding strength is further improved.

Description

technical field [0001] The invention relates to a preparation method of an aluminum-plastic film for lithium battery packaging, and relates to the technical field of aluminum-plastic film for lithium battery packaging. Background technique [0002] In recent years, with the development of polymer lithium-ion battery technology, the application of aluminum-plastic packaging film (also known as aluminum-plastic film) has become more and more extensive. Using aluminum-plastic packaging film to replace the original steel structure packaging material can effectively prevent The explosion accident caused by the high temperature and high pressure generated by the violent chemical reaction inside the battery improves the safety of lithium-ion batteries. [0003] At present, the aluminum-plastic film for lithium battery packaging in the international and domestic markets has been monopolized by Japanese companies in terms of production and technology. In recent years, many domestic c...

Claims

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Application Information

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IPC IPC(8): B29C47/06B29C47/02B29C47/08B32B15/088B32B15/09B32B15/20B32B7/12B32B27/08B29L7/00
CPCB29C48/27B29C48/0011B29C48/08B29C48/154B29C48/18B29L2007/00B32B7/12B32B15/088B32B15/09B32B15/20B32B27/08B32B2307/714
Inventor 罗吉江符书臻郭海涛
Owner SUZHOU DUCHAMPS ADVANCED MATERIALS CO LTD
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