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Lithium battery aluminum-plastic film and preparation method thereof

A technology of aluminum-plastic film and lithium battery, which is applied in battery pack parts, battery box/coating, battery box/cover material, etc., can solve the problem of unsatisfactory electrolyte resistance, low heat-sealing strength, and restrict the development of aluminum-plastic film and other issues, to achieve the effect of improving corrosion resistance, safe and reliable use, and increasing the specific surface area of ​​heat sealing

Active Publication Date: 2014-03-19
MING CROWN ADVANCED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat-sealing layer is generally made of PP (polypropylene) material, and its function is to bond under a certain temperature and pressure during packaging or packaging to play a sealing role. However, under domestic technical conditions, the heat-sealing strength is low, and heat-sealing is usually Strength ≤ 20N / cm, and the effect of electrolyte resistance is not ideal, which restricts the development of aluminum-plastic film for lithium batteries in China to a certain extent

Method used

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  • Lithium battery aluminum-plastic film and preparation method thereof
  • Lithium battery aluminum-plastic film and preparation method thereof
  • Lithium battery aluminum-plastic film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] One side of the aluminum foil layer 2 is combined with the heat-resistant PI layer through the adhesive layer 4, and the corrosion-resistant coating 5 is first formed on the other side, and then the heat-sealing layer 3 is dry-type compounded through the adhesive layer 4. The thickness of the PI layer is 25 μm, the thickness of the aluminum foil is 20 μm, the heat-sealing layer is cast polypropylene (CPP) with a thickness of 20 μm, the corrosion-resistant coating 5 is 3 μm thick, the adhesive layer 4 is 3 μm thick, and the heat-sealing layer is The surface of the inner surface of 3 is provided with a rectangle (such as figure 2 Shown) the concave-convex grid structure AA, the density of the concave-convex grid structure is 2 cells / mm 2 , the depth of the concave part is 2μm, and the outer layer (adhesive bonding surface) is a smooth surface BB (such as Figure 5 shown), the initial heat-sealing strength of the tested product is 35N / cm (heat-sealing conditions: 190°C, ...

Embodiment 2

[0035] One side of the aluminum foil layer 2 is combined with the heat-resistant PI layer through the adhesive layer 4, and the corrosion-resistant coating 5 is first formed on the other side, and then the heat-sealing layer 3 is dry-type compounded through the adhesive layer 4. The thickness of the PI layer is 20 μm, the thickness of the aluminum foil is 25 μm, the heat-sealing layer is cast polypropylene (CPP) with a thickness of 30 μm, the corrosion-resistant coating 5 is 3 μm thick, the adhesive layer 4 is 5 μm thick, and the heat-sealing layer is 3 is provided with rhombus (such as image 3 Shown) the concave-convex grid structure AA, the density of the concave-convex grid structure is 6 cells / mm 2 , the depth of the concave part is 3μm, and the outer layer (adhesive bonding surface) is a smooth surface BB (such as Figure 5 shown), the initial heat-sealing strength of the tested product is 40N / cm (heat-sealing conditions: 190°C, 3s, 0.4Mpa).

Embodiment 3

[0037] One side of the aluminum foil layer 2 is combined with the heat-resistant PI layer through the adhesive layer 4, and the corrosion-resistant coating 5 is first formed on the other side, and then the heat-sealing layer 3 is dry-type compounded through the adhesive layer 4. The thickness of the PI layer is 15 μm, the thickness of the aluminum foil is 25 μm, the heat-sealing layer is cast polypropylene (CPP) with a thickness of 35 μm, the corrosion-resistant coating 5 is 3 μm thick, the adhesive layer 4 is 5 μm thick, and the heat-sealing layer 3 is provided with a hexagonal surface (such as Figure 4 Shown) the concave-convex grid structure AA, the density of the concave-convex grid structure is 10 cells / mm 2 , the depth of the concave part is 5μm, and the outer layer (adhesive bonding surface) is a smooth surface BB (such as Figure 5 shown), the initial heat-sealing strength of the tested product is 42N / cm (heat-sealing conditions: 190°C, 3s, 0.4Mpa).

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Abstract

The invention belongs to the field of an aluminum-plastic packaging film composite material, and particularly relates to a lithium battery aluminum-plastic film and a preparation method thereof. The lithium battery aluminum-plastic film sequentially comprises a heat-resisting polyimide (PI) layer, an adhesive layer, an aluminum foil layer, an anticorrosion coating, an adhesive layer and a heat-seal layer from outside to inside, and the lithium battery aluminum-plastic film is characterized in that the surface of the heat-seal layer is provided with a concave-convex gridding structure. Compared with the prior art, the specific surface area of heat sealing is greatly increased through the concave-convex gridding of the heat-seal layer, a powerful mechanical lock is formed in heat sealing, the high heat-seal strength can be realized, and the application safety of a lithium battery can be reliably guaranteed.

Description

technical field [0001] The invention belongs to the field of aluminum-plastic packaging film composite materials, in particular to an aluminum-plastic film for a lithium battery and a preparation method thereof. [0002] Background technique [0003] The aluminum-plastic composite film for lithium batteries is usually a multi-layer structure, and the structure from outside to inside is: protective layer, barrier layer, and heat-sealing layer. Layers are generally composited and formed by bonding resins in different processes. The protective layer must have excellent toughness and high temperature resistance. The barrier layer plays the role of blocking water vapor and oxygen. The heat-sealing layer is generally made of PP (polypropylene) material, and its function is to bond under a certain temperature and pressure during packaging or packaging to play a sealing role. However, under domestic technical conditions, the heat-sealing strength is low, and heat-sealing is usual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M50/126H01M50/128H01M50/145
CPCB32B3/30B32B15/08B32B15/085B32B15/20B32B2581/00B32B2369/00B32B2439/00B32B2307/304B32B2307/752B32B2255/26B32B2255/06H01M50/116Y02E60/10
Inventor 徐海燕张鹏徐涛
Owner MING CROWN ADVANCED MATERIAL CO LTD
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