Soft package material for lithium battery

A technology for lithium batteries and soft packs, applied in lithium batteries, secondary batteries, battery pack components, etc., can solve the problem of not being able to display the actual temperature and curing uniformity of the aluminum-plastic film, and is conducive to product quality control and follow-up. Use, increase toughness, and uniform effect of aging

Pending Publication Date: 2022-05-06
HANGZHOU FIRST APPLIED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN211121361U installs several temperature and humidity sensors in the aluminum-plastic film curing thermostatic chamber, and outputs them to the outdoor temperature and humidity display box through the temperature and humidity sensors, thereby obtaining real-time temperature and humidity data, and controlling the temperature and humidity in the thermostatic chamber. However, it is still impossible to display the actual temperature and curing uniformity of the aluminum-plastic film itself.
Patent CN112745798A uses light-curing adhesive instead of conventional adhesive, and does not need to be cured in a drying room, but the drawing performance and thermal stability of the aluminum-plastic film obtained by bonding need to be further strengthened

Method used

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  • Soft package material for lithium battery

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preparation example Construction

[0038] In another typical embodiment of the present application, a method for preparing a soft package material for a lithium battery is provided, comprising the following steps: (1) providing a metal foil, and performing corrosion-resistant treatment on both sides thereof to obtain the metal foil Foil layer; (2) using the first adhesive layer to compound the protective layer and one side of the metal foil layer with a pressure roll, and aging to obtain a protective layer / first adhesive layer / metal foil layer laminate; ( 3) using the second adhesive layer to press the thermoplastic resin layer and the other side of the metal foil layer of the protective layer / first adhesive layer / metal foil layer laminate to be laminated and aged to obtain the Soft packaging materials for batteries.

[0039] Further, the metal foil is a single-sided light metal foil, which has undergone degreasing treatment.

[0040] Further, the protective layer is laminated with the dark side of the metal f...

Embodiment 1

[0043] The protective layer is a biaxially stretched nylon film with a thickness of 25 μm, and the manufacturer is Xiamen Changsu Industrial Co., Ltd.;

[0044] The first adhesive layer is a two-component polyurethane glue with a thickness of 4 μm and a main solid ratio of 100 / 16. The manufacturer is Japan Toyobo;

[0045] The metal foil layer is made of aluminum foil, which is a single-sided light aluminum foil with a thickness of 40 μm and has been treated with phosphochromate anticorrosion. The manufacturer is Henan Mingtai Aluminum Co., Ltd.;

[0046] The second adhesive layer is a two-component acid-modified polyolefin resin glue with a thickness of 4 μm and a main solid ratio of 100 / 12. The manufacturer is Japan Toyobo;

[0047] The thickness of the thermoplastic resin layer is 40 μm, the third adhesive layer and the heat-sealing layer are polyolefin elastomer (2% by mass fraction) as the dispersed phase, and polypropylene resin (98% by mass fraction, melting point 110-1...

Embodiment 2

[0052] Both the protective layer and the support layer contain 0.1% of thermochromic material 1, and the others are the same as in Example 1.

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Abstract

The invention discloses a soft package material for a lithium battery, the soft package material for the lithium battery comprises a metal foil layer, a protective layer located on one side of the metal foil layer and a thermoplastic resin layer located on the other side of the metal foil layer, and a bonding layer exists between the metal foil layer and the protective layer and / or between the metal foil layer and the thermoplastic resin layer; and the protective layer and / or the thermoplastic resin layer contain / contains a thermochromic material. According to the soft package material for the lithium battery, a temperature display function is realized by adding the thermochromic material, so that the temperature and curing uniformity of each part of the soft package material in a curing process can be indicated, the consistency of product performance is ensured, the product quality control and the use performance of subsequent products are facilitated, and the soft package material has a good application prospect.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a soft package material for lithium batteries. Background technique [0002] Soft packaging materials have the advantages of light weight, controllable shape and high safety factor, and are widely used lithium battery packaging materials. Soft packaging materials for lithium batteries are generally composed of an outer protective layer, an intermediate metal foil layer, an inner thermoplastic resin layer, and an interlayer adhesive layer. strong bond between. In the production process, the curing temperature is an extremely important indicator. The difference in curing temperature will cause different curing degrees, resulting in different bonding strengths and affecting the uniformity of product performance. At present, the curing temperature control method is relatively simple, mainly relying on thermometers to measure the air temperature in the curing room; the air temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/48H01M50/129H01M50/14
CPCH01M10/052H01M50/129H01M50/14H01M10/486
Inventor 范开成沈丽梅王恒旭余小玉
Owner HANGZHOU FIRST APPLIED MATERIAL CO LTD
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