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Preparation method of flexible package material of lithium ion battery

A lithium-ion battery and flexible packaging technology, which is applied in the direction of battery case/cover material, battery, battery case/cover, etc., can solve problems such as high brittleness, insufficient cold stamping performance, and insufficient mechanical properties, so as to achieve smooth surface and avoid thermal stress , to avoid uneven effects

Active Publication Date: 2015-09-23
湖北塑金复合材料有限责任公司
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  • Abstract
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Problems solved by technology

[0007] The invention proposes a method for preparing a flexible packaging material for lithium-ion batteries, which solves the problems of insufficient mechanical properties of lithium-ion battery flexible packaging materials in the prior art, especially insufficient cold stamping performance, high brittleness, and whitening phenomenon. On the basis of maintaining or improving the overall mechanical properties of lithium-ion battery flexible packaging materials, reduce brittleness, improve cold stamping performance, reduce whitening phenomenon, make the heat-sealing layer better combine with aluminum foil, and improve the product quality of lithium-ion battery flexible packaging materials

Method used

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preparation example Construction

[0039] see figure 1 As shown, the embodiment of the present invention provides a method for preparing a lithium-ion battery flexible packaging material, comprising the following steps:

[0040] S1. Clean the aluminum foil 3, and then perform pretreatment on the cleaned aluminum foil 3. The pretreatment includes forming an inner protective layer 4 on one side of the aluminum foil 3.

[0041] S2. Prepare the heat-sealing layer, the heat-sealing layer includes a cast polyolefin film layer 7 and a modified polyolefin film layer 5 arranged in a laminated manner, the modified polypropylene film layer 5 is arranged on the side of the inner protective layer 4 of the aluminum foil 3, heat The sealing layer is compounded together by co-extrusion at a temperature of 100-150 degrees.

[0042] S3. At a temperature of 140-160 degrees, the heat-sealing layer is heat-laminated on the side of the aluminum foil 3 provided with the inner protective layer 4 through a heat laminating machine to f...

Embodiment 1

[0063] This embodiment provides a method for preparing a lithium-ion battery flexible packaging material, wherein the selected aluminum foil 3 is a soft aluminum foil with a thickness of 40 microns and a width of 650 mm, which specifically includes the following steps:

[0064] Step 101, wash the aluminum foil 3 with water, and then perform pretreatment on the cleaned aluminum foil 3. The pretreatment includes preparing a passivation solution containing trivalent chromium ions. The mass fraction of the trivalent chromium salt in the solution is 0.3%. The aluminum foil 3 is soaked in the prepared trivalent chromium ion solution, and the chromium oxide is deposited on the surface of the aluminum foil 3 after drying, and a thin and dense outer protective layer of chromium oxide is formed on both sides of the aluminum foil 3 respectively. 3 and the inner protective layer 4. The thickness of the inner protective layer 4 is 0.1 micron, and the thickness of the outer protective layer...

Embodiment 2

[0073] This embodiment provides a method for preparing a lithium-ion battery flexible packaging material, wherein the selected aluminum foil 3 is a soft aluminum foil with a thickness of 100 microns and a width of 650 mm, which specifically includes the following steps:

[0074]Step 201, wash the aluminum foil 3 with water, and then perform pretreatment on the cleaned aluminum foil 3. The pretreatment includes preparing a passivation solution containing trivalent chromium ions. The mass fraction of the trivalent chromium salt in the solution is 3.3%. The aluminum foil 3 is soaked in the prepared solution of trivalent chromium ions. After drying, the chromium oxide is deposited on the surface of the aluminum foil 3, and at the same time, a thin and dense outer protective layer 3 of chromium oxide is formed on both sides of the aluminum foil 3. and inner protective layer 4. The thickness of the inner protective layer 4 is 1 micron, and the thickness of the outer protective layer...

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Abstract

The invention provides a preparation method of the flexible package material of a lithium ion battery, and relates to the technical field of the flexible package material of the lithium ion battery. The method comprises the following steps: cleaning an aluminum foil, forming an inner protection layer for aluminum foil preprocessing; preparing a heat-seal layer; at a temperature of 140-160DEG C, carrying out heat lamination on the heat-seal layer to cause the heat-seal layer to be formed on the side surface, which is provided with the protection layer, of the aluminum foil, and forming a first composite layer; at the temperature of 180-210DEG C, carrying out plasticization processing on the first composite layer, then, carrying out subsection cooling, keeping a first-section cooling temperature of 140-155DEG C for 1-5 minutes, and keeping a second-section cooling temperature of 100-130DEG C for 1-5 minutes; at a constant temperature of 20-70DEG C, rolling the first composite layer; and carrying out solidification after an outer protection layer is compounded to the aluminum foil of the first composite layer through dry method co-extrusion compounding. The heat-seal layer can be favorably directly bonded with the aluminum foil, on the basis that the integral mechanical property of the flexible package material can be kept or improved, brittleness is lowered, and cold stamping performance is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery flexible packaging materials, in particular to a preparation method of lithium-ion battery flexible packaging materials. Background technique [0002] Lithium-ion batteries are widely used in electronic equipment such as mobile phones and computers because they are safer and more environmentally friendly than traditional batteries, and are also used in electric transportation equipment such as electric vehicles. The external packaging material of lithium-ion battery cells is lithium-ion battery flexible packaging materials. The quality of lithium-ion battery flexible packaging materials determines the service life of lithium-ion batteries. Lithium-ion battery flexible packaging materials play a key role in the application of lithium-ion batteries. [0003] Lithium-ion battery flexible packaging materials basically include an outer protective layer facing the outside, an aluminum foil l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M50/126H01M50/128H01M50/129
CPCH01M2220/30H01M2220/20H01M50/116Y02E60/10
Inventor 吴文辉吴立则
Owner 湖北塑金复合材料有限责任公司
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