Elastic aluminium-plastic film used for flexible package of lithium battery and production method

An aluminum-plastic film and flexible packaging technology, which is applied in the field of elastic aluminum-plastic film for lithium battery flexible packaging and its preparation, can solve problems such as affecting the safety and service life of lithium batteries, micro-cracks in the aluminum foil layer, and easy corrosion of the outer layer of the aluminum-plastic film. , to achieve the effect of improving safety and service life, improving corrosion resistance and good elasticity

Inactive Publication Date: 2020-02-04

CHENDU NEW KELI CHEM SCI CO LTD

7 Cites 4 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0007] According to the above, the outer layer of the aluminum-plastic film used for lithium batteries in the existing solutions is easy to corrode, and it is easy to generate bubbling and cause microcracks in the aluminum foil layer, which affects ...

Abstract

The invention relates to the field of lithium batteries, and discloses an elastic aluminium-plastic film used for a flexible package of a lithium battery and a production method. The production methodcomprises the following production process: (1) adding heat-resisting resin and a first binding material into a screw extruder, and conducting coextrusion casting and film-forming to obtain a nylon cast film outer protection layer; and (2) sequentially arranging the nylon cast film outer protection layer 1, a fluororubber microcellular foam layer 2, a first adhesive layer 3, an aluminium foil layer 4, a PP lamination layer 5 and a CPP film heat sealing layer 6 from outside in for lamination and compounding, and bonding the layers through an adhesive to produce the elastic aluminium-plastic film used for the flexible package of the lithium battery. Compared with an ordinary aluminium-plastic film, the produced elastic aluminium-plastic film has good elastic performance, bubbles on surfacesof the lithium battery are effectively avoided, micro-cracks of the aluminium foil layer in the aluminium-plastic package film are prevented, and meanwhile, the corrosion-resistant performance is good, so that the use safety of the aluminium-plastic film of the lithium battery is significantly improved, and the service life of the aluminium-plastic film of the lithium battery is significantly prolonged.

Application Domain

Synthetic resin layered productsCell component details +4

Technology Topic

Aluminium foilCorrosion resistant +9

Image

Examples

Experimental program(6)
Comparison scheme(1)

Example Embodiment

[0033] Example 1

[0034] (1) The heat-resistant resin and the first bonding material are added to the screw extruder, and the film is formed by co-extrusion casting to obtain the outer protective layer of the nylon cast film; the heat-resistant resin is nylon 6; the first bonding The material is epoxy resin; the added amount of the first bonding material is 10% of the mass of the heat-resistant resin;

[0035] (2) As attached figure 1 As shown, the nylon cast film outer protective layer 1, the fluorine rubber microporous foam layer 2, the first adhesive layer 3, the aluminum foil layer 4, the PP coating layer 5, the CPP film heat sealing layer are arranged in order from the outside to the inside The order of 6 is laminated and compounded, and the layers are bonded by adhesive to prepare an elastic aluminum-plastic film for flexible packaging of lithium batteries; fluorine rubber is fluorine rubber 26; fluorine rubber microporous foam layer contains zinc oxide; zinc oxide is added The amount is 3% of the fluorine rubber mass; the first adhesive layer is an epoxy resin layer; the adhesive is polymethyl acrylate.

[0036] The thickness of the outer protective layer 1 of the nylon cast film is 30μm, the thickness of the fluororubber microcellular foam layer 2 is 20μm, the thickness of the first adhesive layer 3 is 2μm, the thickness of the aluminum foil layer 4 is 30μm, and the PP coating layer 5 The thickness of the CPP film heat-sealing layer 6 is 5 μm, and the thickness of the CPP film heat-sealing layer 6 is 20 μm.

[0037] The aluminum-plastic film prepared in Example 1 was in contact with the deteriorated electrolyte for 60 days, and the corrosion area and surface blistering phenomenon are shown in Table 1. Attached figure 2 It is the aluminum plastic film after 60 days in contact with the degraded electrolyte, without corrosion points and bulges.

Example Embodiment

[0038] Example 2

[0039] (1) The heat-resistant resin and the first bonding material are added to the screw extruder, and the film is formed by co-extrusion casting to obtain the outer protective layer of the nylon cast film; the heat-resistant resin is nylon 12; the first bonding The material is silicone resin; the added amount of the first bonding material is 5% of the mass of the heat-resistant resin;

[0040] (2) Nylon cast film outer protective layer 1, fluorine rubber microporous foam layer 2, first adhesive layer 3, aluminum foil layer 4, PP coating layer 5, and CPP film heat sealing layer are arranged in order from outside to inside 6 is laminated and compounded in sequence, and the layers are bonded by adhesive to prepare an elastic aluminum-plastic film for lithium battery soft packaging; fluorine rubber is perfluoroether rubber; fluorine rubber microporous foam layer contains aluminum oxide; aluminum oxide The added amount is 4% of the mass of the fluorine rubber; the first adhesive layer is a silicone layer; the adhesive is polyethylmethacrylate.

[0041] The thickness of the outer protective layer 1 of the nylon cast film is 40μm, the thickness of the fluororubber microporous foam layer 2 is 30μm, the thickness of the first adhesive layer 3 is 1μm, the thickness of the aluminum foil layer 4 is 30μm, and the PP coating layer 5 The thickness of the CPP film heat-sealing layer 6 is 4 μm, and the thickness of the CPP film heat-sealing layer 6 is 20 μm.

[0042] Table 1 shows the corrosion area and surface bubbling of the aluminum plastic film prepared in Example 2.

Example Embodiment

[0043] Example 3

[0044] (1) The heat-resistant resin and the first bonding material are added to the screw extruder, and the film is formed by co-extrusion casting to obtain the outer protective layer of the nylon cast film; the heat-resistant resin is nylon 1010; the first bonding The material is epoxy resin; the added amount of the first bonding material is 15% of the mass of the heat-resistant resin;

[0045] (2) Nylon cast film outer protective layer 1, fluorine rubber microporous foam layer 2, first adhesive layer 3, aluminum foil layer 4, PP coating layer 5, and CPP film heat sealing layer are arranged in order from outside to inside Laminated and compounded in the order of 6, each layer is bonded by an adhesive to prepare an elastic aluminum-plastic film for lithium battery soft packaging; fluorine rubber is tetrapropylene fluorine rubber; fluorine rubber microporous foam layer contains magnesium oxide; magnesium oxide The added amount is 5% of the mass of the fluorine rubber; the first adhesive layer is an epoxy resin layer; the adhesive is polyethyl acrylate.

[0046] The thickness of the outer protective layer 1 of the nylon cast film is 10μm, the thickness of the fluororubber microporous foam layer 2 is 10μm, the thickness of the first adhesive layer 3 is 3μm, the thickness of the aluminum foil layer 4 is 50μm, and the PP coating layer 5 The thickness of the CPP film heat-sealing layer 6 is 3 μm, and the thickness of the CPP film heat-sealing layer 6 is 30 μm.

[0047] Table 1 shows the corrosion area and blistering phenomenon of the aluminum plastic film prepared in Example 3.

PUM

Property	Measurement	Unit
Melting point	165.0 ~ 280.0	°C
Thickness	10.0 ~ 50.0	µm
Thickness	10.0 ~ 30.0	µm

Description & Claims & Application Information

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Elastic aluminium-plastic film used for flexible package of lithium battery and production method

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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