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A kind of preparation method of lithium ion battery flexible packaging material

A lithium-ion battery and flexible packaging technology, which is applied in the direction of battery box/case materials, batteries, battery pack parts, etc., can solve the problems of insufficient cold stamping performance, insufficient mechanical properties, and high brittleness, so as to avoid thermal stress and unsatisfactory Smooth, smooth surface effect

Active Publication Date: 2018-05-04
湖北塑金复合材料有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of preparation method of lithium ion battery flexible packaging material
  • A kind of preparation method of lithium ion battery flexible packaging material
  • A kind of preparation method of lithium ion battery flexible packaging material

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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 soft packaging material, which includes the following steps:

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

[0041] S2. Prepare a heat-sealing layer. The heat-sealing layer includes a cast polyolefin film layer 7 and a modified polyolefin film layer 5 arranged in a stack. The modified polypropylene film layer 5 is arranged on the side of the inner protective layer 4 of the aluminum foil 3. 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 thermally laminated on the side surface of the aluminum foil 3 with the inner protective layer 4 by a heat laminator to form the first composite layer.

[0043] S...

Embodiment 1

[0063] This embodiment provides a method for preparing a lithium-ion battery soft 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, the aluminum foil 3 is washed with water, and then the cleaned aluminum foil 3 is pretreated. The pretreatment includes preparing a passivation solution containing trivalent chromium ions. The mass fraction of trivalent chromium salt in the solution is 0.3%. The aluminum foil 3 is immersed in a solution of configured trivalent chromium ions. After drying, the chromium oxide is deposited on the surface of the aluminum foil 3. At the same time, a thin and dense outer protective layer of chromium oxide is formed on both sides of the aluminum foil 3 3 and inner protective layer 4. The thickness of the inner protective layer 4 is 0.1 μm, and the thickness of the outer protective layer is 0.1 μm.

[0065] S...

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, the aluminum foil 3 is washed with water, and then the cleaned aluminum foil 3 is pretreated. The pretreatment includes preparing a passivation solution containing trivalent chromium ions. The mass fraction of trivalent chromium salt in the solution is 3.3%. The aluminum foil 3 is soaked in a solution of configured trivalent chromium ions. After drying, the chromium oxide is deposited on the surface of the aluminum foil 3. At the same time, a thin and dense outer protective layer of chromium oxide 3 is formed on both sides of the aluminum foil 3 And inner protective layer4. The thickness of the inner protective layer 4 is 1 micrometer, and the thickness of the outer protective layer is 1 microme...

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Abstract

The invention provides a method for preparing a lithium-ion battery flexible packaging material, which relates to the technical field of lithium-ion battery flexible packaging materials. The method includes cleaning the aluminum foil, and pretreating the aluminum foil to form an inner protective layer; preparing a heat-sealing layer; The heat-sealing layer is heat-laminated on the side of the aluminum foil with the inner protective layer to form the first composite layer; the first composite layer is plasticized at 180-210 degrees and then cooled in sections. The temperature of the first section of cooling is 140-155 degrees, keep warm for 1-5 minutes, the second cooling temperature is 100-130 degrees, keep warm for 1-5 minutes; wind the first composite layer at a constant temperature of 20-70 degrees; pass the outer protective layer through the dry Co-extruded and compounded on the aluminum foil of the first composite layer and then solidified. The invention not only enables the heat-sealing layer to be directly bonded to the aluminum foil, but also reduces the brittleness and improves the cold stamping performance on the basis of maintaining or improving the overall mechanical properties of the flexible packaging material.

Description

Technical field [0001] The invention relates to the technical field of lithium-ion battery soft packaging materials, in particular to a method for preparing lithium-ion battery soft packaging materials. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, computers and other electronic equipment because they have more superior performance than traditional batteries, such as being safer and more environmentally friendly, and are also used in electric vehicles and other electric transportation equipment. The external packaging material of lithium-ion battery cells is a lithium-ion battery flexible packaging material. The quality of the lithium-ion battery flexible packaging material determines the service life of the lithium-ion battery. The lithium-ion battery flexible packaging material plays a key role in the application of lithium-ion batteries. [0003] The lithium-ion battery soft packaging material basically includes an outer protective layer f...

Claims

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Application Information

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