Puncture-resistant electrolyte-resistant casting polypropylene film, aluminum-plastic film and application of puncture-resistant electrolyte-resistant casting polypropylene film and aluminum-plastic film

A technology of casting polypropylene and electrolyte, which is applied in the field of aluminum-plastic film, can solve the problems of corroding aluminum-plastic film, accelerating electrolyte penetration rate, leakage, etc. The effect of abrasion resistance

Pending Publication Date: 2022-03-04
浙江华正能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the burr inside the cell penetrates to the heat-sealing layer, it will still cause defects in the electrolyte-resistant heat-sealing layer, thereby accelerating the penetration rate of the electrolyte, causing it to gradually corrode the aluminum-plastic film and cause leakage in a long-term environment. liquid and other safety hazards

Method used

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  • Puncture-resistant electrolyte-resistant casting polypropylene film, aluminum-plastic film and application of puncture-resistant electrolyte-resistant casting polypropylene film and aluminum-plastic film
  • Puncture-resistant electrolyte-resistant casting polypropylene film, aluminum-plastic film and application of puncture-resistant electrolyte-resistant casting polypropylene film and aluminum-plastic film
  • Puncture-resistant electrolyte-resistant casting polypropylene film, aluminum-plastic film and application of puncture-resistant electrolyte-resistant casting polypropylene film and aluminum-plastic film

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Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, the puncture-resistant and electrolyte-resistant cast polypropylene film of this embodiment includes a heat-sealing base layer A, a core layer B and a corona layer C that are sequentially stacked and distributed.

[0032] Wherein, the heat-sealing base layer A includes 20 parts by mass of random copolymerized heat-sealable polypropylene, 0.5 parts by mass of a slip agent and 0.1 parts by mass of an antistatic agent;

[0033] Core layer B comprises the nano-silicon nitride of the polypropylene copolymer of 80 mass parts and 0.5 mass part;

[0034] The corona layer C included 20 parts by mass of random copolymerized polypropylene.

[0035] In addition, the preparation process of the puncture-resistant and electrolyte-resistant cast polypropylene film of this embodiment includes:

[0036] Mix the materials of each layer with a high-speed mixer to disperse them evenly, and put them into three extruders for melting and plasticization. The heating...

Embodiment 2

[0040] The difference between the puncture-resistant and electrolyte-resistant cast polypropylene film of the present embodiment and that of Example 1 is:

[0041] Core layer comprises the nano-silicon nitride of the polypropylene copolymer of 80 mass parts and 2 mass parts;

[0042] Other components and technology are with embodiment 1;

[0043] The heat-sealing layer of the aluminum-plastic film of this embodiment adopts the puncture-resistant and electrolyte-resistant cast polypropylene film of this embodiment, and other structures are the same as that of Embodiment 1.

Embodiment 3

[0045] The difference between the puncture-resistant and electrolyte-resistant cast polypropylene film of the present embodiment and that of Example 1 is:

[0046] Core layer comprises the nano-silicon nitride of the polypropylene copolymer of 80 mass parts and 5 mass parts;

[0047] Other components and technology are with embodiment 1;

[0048] The heat-sealing layer of the aluminum-plastic film of this embodiment adopts the puncture-resistant and electrolyte-resistant cast polypropylene film of this embodiment, and other structures are the same as that of Embodiment 1.

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Abstract

The invention relates to a puncture-resistant electrolyte-resistant casting polypropylene film, an aluminum-plastic film and application of the puncture-resistant electrolyte-resistant casting polypropylene film and the aluminum-plastic film. The puncture-resistant electrolyte-resistant casting polypropylene film comprises a heat-sealing base layer, a core layer and a corona layer which are sequentially distributed in an overlapped mode, the corona layer is polypropylene random copolymer, and the core layer comprises polypropylene random copolymer and nano silicon nitride. According to the puncture-resistant electrolyte-resistant casting polypropylene film disclosed by the invention, nano silicon nitride is introduced into the core layer, so that the core layer polypropylene with higher nano hardness shows higher wear resistance; in addition, the nano silicon carbide can also be used as a nucleating agent to improve the crystallization property of polypropylene so as to enhance the mechanical property; besides, due to the addition of the nano silicon nitride, the heat sealing performance of the heat sealing layer of the aluminum-plastic film and the bonding performance between the corona layer and glue are not influenced, and the core layer with high puncture strength and the complete corona layer structure can still be kept while the CPP puncture performance is improved, so that the core layer has high puncture strength under the condition that the core layer is punctured and worn by burrs in a battery cell for many times, and the service life of the core layer is prolonged. And a relatively complete electrolyte-resistant casting polypropylene structure can still be kept.

Description

technical field [0001] The invention belongs to the technical field of aluminum-plastic films, and in particular relates to a puncture-resistant and electrolyte-resistant casting polypropylene film, an aluminum-plastic film and applications thereof. Background technique [0002] As the outer packaging material of soft-pack lithium batteries, aluminum-plastic film is mainly used in the packaging of soft-pack batteries in the fields of 3C digital, energy storage and power. [0003] At present, the dry-process aluminum-plastic film commonly used in the market is mainly composed of an outer protective layer, a middle aluminum foil layer and an inner heat-sealing layer, and the layers are bonded by adhesives. Among them, the outer protective layer mainly protects the middle aluminum foil layer from being scratched; the middle aluminum foil layer mainly acts as a barrier to prevent moisture intrusion and block oxygen; the inner heat-sealing layer is an electrolyte-resistant layer,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/417H01M50/124B32B27/32
CPCH01M50/449H01M50/403H01M50/417H01M50/1245B32B27/32Y02E60/10
Inventor 张潇夏旭峰雷中伟
Owner 浙江华正能源材料有限公司
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