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A kind of lithium battery steel-plastic film packaging material and preparation method thereof

A technology for film packaging and lithium batteries, which is applied in the field of lithium battery steel-plastic film packaging materials and its preparation, can solve problems such as the inability to achieve thinning, lightweight and special-shaped, aggravated battery polarization and aging, and insufficient hardness of packaging materials. Achieve the effects of improving insufficient hardness, slowing down battery polarization, and inhibiting volume expansion

Active Publication Date: 2018-02-13
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the first type, it is packaged in a square or cylindrical steel shell or aluminum shell. The battery using this type of material is packaged by laser welding. At the same time, the metal shell is thick and has high hardness, which can effectively prevent battery expansion and electrolyte production. Gas, but can not achieve thin, lightweight, special-shaped;
[0004] For the second type, aluminum-plastic composite film packaging is used. This material is generally composed of aluminum foil and PP material, which is easy to realize packaging, can be thinned and shaped, and will not cause safety problems such as explosion. The aluminum layer is relatively soft, and the hardness of the entire packaging material is not enough, so it cannot exert a certain pressure on the battery expansion and internal gas generation, which will easily aggravate the polarization and aging of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A steel-plastic film packaging material for lithium batteries, which sequentially includes a pp layer, a first adhesive layer, a stainless steel foil layer, a second adhesive layer, a nylon layer, a third adhesive layer, and a PET layer from outside to inside. The thickness is 20-100μm; the thickness of the stainless steel foil is 20-60μm; the thickness of the PET layer is 5-20μm; the first bonding layer, the second bonding layer and the third bonding layer are polyethyleneimine adhesives , polyurethane adhesive or melamine adhesive, and the thickness of the three bonding layers is 1-20 μm.

[0024] The preparation method of this lithium battery packaging material structure specifically comprises the following steps:

[0025] A. Use stainless steel foil with a thickness of 20 μm, wash it in pure water first, and then dry it;

[0026] B. Under the protective atmosphere of nitrogen or argon, the adhesive is evenly coated on the surface of the stainless steel foil in the ...

Embodiment 2

[0030] A steel-plastic film packaging material for lithium batteries, which sequentially includes a pp layer, a first adhesive layer, a stainless steel foil layer, a second adhesive layer, a nylon layer, a third adhesive layer, and a PET layer from outside to inside. The thickness is 20-100μm; the thickness of the stainless steel foil is 20-60μm; the thickness of the PET layer is 5-20μm; the first bonding layer, the second bonding layer and the third bonding layer are polyethyleneimine adhesives , polyurethane adhesive or melamine adhesive, and the thickness of the three bonding layers is 1-20 μm.

[0031] The preparation method of this lithium battery packaging material structure specifically comprises the following steps:

[0032] A. Use stainless steel foil with a thickness of 60 μm, wash it in pure water first, and then dry it;

[0033] B. Under the protective atmosphere of nitrogen or argon, the adhesive is evenly coated on the surface of the stainless steel foil in the ...

Embodiment 3

[0037] A lithium battery steel-plastic film packaging material, which sequentially includes a pp layer, an additional layer, a first bonding layer, a stainless steel foil layer, a second bonding layer, a nylon layer, a third bonding layer and a PET layer from outside to inside, The thickness of the pp layer is 20-100 μm; the thickness of the additional layer is 20-50 μm; the thickness of the stainless steel foil is 20-60 μm; the thickness of the PET layer is 5-20 μm; the first adhesive layer, the second adhesive layer and the third adhesive layer The bonding layer is polyethyleneimine adhesive, polyurethane adhesive or melamine adhesive, and the thickness of the three bonding layers is 1-20 μm.

[0038] The preparation method of this lithium battery packaging material structure specifically comprises the following steps:

[0039] A. Use stainless steel foil with a thickness of 40 μm, wash it in pure water first, and then dry it;

[0040] B. Under the protective atmosphere of ...

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Abstract

The invention relates to the field of battery preparation, in particular to a lithium battery steel-plastic film packaging material and a preparation method thereof. From outside to inside, it includes pp layer, first adhesive layer, stainless steel foil layer, second adhesive layer, nylon layer, third adhesive layer and PET layer. The invention uses stainless steel foil to replace the aluminum foil in the aluminum-plastic film, and uses a "steel-plastic film" as the packaging material for lithium batteries. On the basis of retaining the advantages of the aluminum-plastic composite film packaging material, the strength and hardness of the packaging material are further improved. On the one hand, it can effectively inhibit the volume expansion during the battery cycle, slow down the polarization of the battery, and thus improve the battery life; on the other hand, the new "steel-plastic film" is more conducive to the group assembly of power batteries due to the increased hardness of the shell.

Description

technical field [0001] The invention relates to the field of battery preparation, in particular to a lithium battery steel-plastic film packaging material and a preparation method thereof. Background technique [0002] At present, regarding the packaging of lithium batteries, one is to use metal steel or aluminum plates to form square or cylindrical packaging through welding processes; the other is to form aluminum-plastic composite film packaging by combining aluminum foil and polypropylene resin. [0003] For the first type, it is packaged in a square or cylindrical steel shell or aluminum shell. The battery using this type of material is packaged by laser welding. At the same time, the metal shell is thick and has high hardness, which can effectively prevent battery expansion and electrolyte production. Gas, but can not achieve thin, lightweight, special-shaped; [0004] For the second type, aluminum-plastic composite film packaging is used. This material is generally co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/02H01M10/058B32B15/085B32B15/088B32B15/20B32B27/08B32B27/32B32B27/34B32B27/36B32B7/12B32B37/06B32B37/10B32B37/12H01M50/119H01M50/121H01M50/126
CPCY02E60/10Y02P70/50
Inventor 李凡群朱修锋韩笑
Owner WANXIANG 123 CO LTD