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Novel safe aluminum-plastic film

An aluminum-plastic film, safe technology, applied in the direction of electrical components, circuits, layered products, etc., can solve the problems of lithium battery bulging, combustion, fire, accumulation, etc., to avoid excessive internal temperature, prevent fire, good heat conduction and absorption The effect of the heat function

Pending Publication Date: 2022-02-22
SUZHOU RDX NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three packaging forms of cylindrical, square and flexible packaging of lithium batteries mentioned above all have safety problems. During the charging or discharging process of lithium batteries, the electrolyte lithium hexafluorophosphate LiPF 6 A large amount of HF gas or other gases will be generated in the redox reaction, which will cause the lithium battery to bulge, and the bulge to the limit may cause an explosion; in addition, if the lithium battery encounters a failure, a short circuit occurs or is out of control When the internal temperature of the lithium battery is too high, a large amount of heat will be generated inside the lithium battery. When the internal temperature of the lithium battery is too high, it may burn and catch fire.
[0003] At present, when the lithium battery is packaged, the lithium battery is wrapped in a cylindrical, square or soft package by heat sealing. At present, the heat sealing temperature of the conventional packaging material is 180-200°C. The strength of tearing the packaging material is very high. After the conventional packaging material is cooled down after heat sealing, it needs 80 ~ 120N to tear it at room temperature, and the melting point of the conventional packaging material is between 215 ~ 230 ° C. Its heat-sealing strength is 80-100N, which makes the heat-sealing materials of conventional packaging materials very strong no matter at normal temperature or at higher temperature, and is not easily affected by the temperature and large amount of heat generated inside the lithium battery. HF damage, which will directly lead to the accumulation of a large amount of heat and gas, and when the volume expansion of the internal gas of the packaging material is excessive or the heat is too high, it may cause explosion or fire. These are very dangerous situations, so how It is particularly important to release the gas and heat inside the lithium battery gently

Method used

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Examples

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specific Embodiment example 1

[0026] A new type of safe aluminum-plastic film, characterized in that it includes an outer protective layer 1, a middle aluminum foil layer 2, and an inner heat-sealing layer 3 stacked in sequence, wherein the inner heat-sealing layer 3 includes an adhesive MPP layer 31, PP layer 32 and heat-sealed PP layer 33, and the side close to the lithium battery is a single-layer heat-sealed PP layer 33, the side away from the lithium battery is an adhesive MPP layer 31, and the outer protective layer 1 is nylon layer, the preparation method of the heat-sealed PP layer 33 comprises the following steps:

[0027] Step 1: Prepare the raw materials in the following proportions by weight: 90% of nano heat-conducting and heat-absorbing materials, 3% of coupling agent, and 7% of maleic anhydride are mixed and stirred at room temperature to obtain mixture A;

[0028] Step 2: mixing and stirring 5% of mixture A and 95% of low melting point PP to obtain mixture B;

[0029] Step 3: Add the mixtu...

specific Embodiment example 2

[0032] A new type of safe aluminum-plastic film, characterized in that it includes an outer protective layer 1, a middle aluminum foil layer 2, and an inner heat-sealing layer 3 stacked in sequence, wherein the inner heat-sealing layer 3 includes an adhesive MPP layer 31, PP layer 32 and heat-sealed PP layer 33, and the side close to the lithium battery is a single-layer heat-sealed PP layer 33, the side away from the lithium battery is an adhesive MPP layer 31, and the outer protective layer 1 is nylon layer, the preparation method of the heat-sealed PP layer 33 comprises the following steps:

[0033] Step 1: Prepare the following raw materials in parts by weight: 93% of nano heat-conducting and heat-absorbing materials, 2% of coupling agent, and 5% of maleic anhydride are mixed and stirred at room temperature to obtain mixture A;

[0034] Step 2: Mix and stir 3% mixture A and 97% low melting point PP to obtain mixture B;

[0035] Step 3: Add the mixture B to a reciprocating...

specific Embodiment example 3

[0038] A new type of safe aluminum-plastic film, characterized in that it includes an outer protective layer 1, a middle aluminum foil layer 2, and an inner heat-sealing layer 3 stacked in sequence, wherein the inner heat-sealing layer 3 includes an adhesive MPP layer 31, PP layer 32 and heat-sealed PP layer 33, and the side close to the lithium battery is a single-layer heat-sealed PP layer 33, the side away from the lithium battery is an adhesive MPP layer 31, and the outer protective layer 1 is nylon layer, the preparation method of the heat-sealed PP layer 33 comprises the following steps:

[0039] Step 1: Prepare the raw materials in the following proportions by weight: 95% of nano heat-conducting and heat-absorbing materials, 2% of coupling agent, and 3% of maleic anhydride are mixed and stirred at room temperature to obtain mixture A;

[0040] Step 2: mixing and stirring 2% of mixture A and 98% of low melting point PP to obtain mixture B;

[0041]Step 3: Add the mixtur...

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Abstract

The invention provides a novel safe aluminum-plastic film, which is of a flexible package structure of a lithium battery and comprises an external protection layer, a middle aluminum foil layer and an internal heat-sealing layer which are sequentially stacked, wherein the internal heat-sealing layer comprises an adhesive MPP layer, a PP layer and a heat-sealing PP layer which are sequentially stacked, the side, close to the lithium battery, of the internal heat-sealing layer is a single-layer heat-sealing PP layer, the adhesive MPP layer is arranged on one side far away from the lithium battery, and the heat-sealing PP layer is a low-melting-point PP layer. According to the invention, the melting point of the heat-sealing PP material modified by the technology is 100-110 DEG C; and when the heated temperature reaches 100-140 DEG C, the heat-sealing strength is 2-100 N, which is far lower than the heat-sealing strength 80-120 N of a conventional hot air material, so that the flexible package of the lithium battery is easily impacted open by internal gas at high temperature, the internal temperature of the lithium battery can be prevented from being too high, and fire is prevented.

Description

technical field [0001] The invention relates to the field of lithium electronic batteries, and more specifically, relates to a novel safe aluminum-plastic film. Background technique [0002] There are three main packaging forms of lithium batteries: cylinder, square and soft package. There are many types of cylindrical lithium batteries, such as 14650, 17490, 18650, 21700, 26650, etc., and square lithium batteries usually refer to square aluminum or steel shells. Battery, soft-pack lithium battery is a liquid lithium-ion battery covered with a polymer shell. The biggest difference from other batteries is the soft packaging material, usually aluminum-plastic composite film, which is also the most critical and technically difficult soft-pack lithium battery. The highest material, flexible packaging materials are usually divided into three layers, the first layer is the outer resistance layer located in the outermost layer, the outer layer is generally made of nylon BOPA or PET...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/085B32B15/088B32B15/20B32B27/08B32B27/32B32B27/34B32B7/12H01M50/119H01M50/128H01M50/131
CPCB32B15/085B32B15/088B32B15/20B32B27/08B32B27/32B32B27/34B32B7/12H01M50/119H01M50/128H01M50/131Y02E60/10
Inventor 张建林张黎明
Owner SUZHOU RDX NEW MATERIAL TECH CO LTD