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Lithium battery insulating film and preparation method thereof

An insulating film and lithium battery technology, applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of increasing plasma cleaning stations, increasing plasma cleaning processes, and affecting production line efficiency, so as to avoid plasma Cleaning stations, eliminating the need for plasma cleaning processes, and improving production line efficiency

Active Publication Date: 2020-08-18
湖南领湃达志科技股份有限公司 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual production, it is necessary to increase the number of plasma cleaning stations, which increases the cost of the production line, and adds a step of plasma cleaning process, which affects the efficiency of the production line

Method used

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  • Lithium battery insulating film and preparation method thereof
  • Lithium battery insulating film and preparation method thereof
  • Lithium battery insulating film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] Based on the lithium battery insulating film, the technical solution of the present application also provides a method for preparing a lithium battery insulating film, including:

[0036] Step S1: preparing nano-titanium dioxide dispersion;

[0037] Step S2: mixing the polyester material and the thermally conductive material, mixing the polyester material and the thermally conductive material, melting the polyester material, and adding nano titanium dioxide dispersion liquid to the thermally conductive material and the melted polyester material;

[0038] Step S3: forming a film by cold casting, so that the nano-titanium dioxide in the nano-titanium dioxide dispersion liquid and the heat-conducting material are dispersed in the polyester material, and part of the nano-titanium dioxide is coated on the surface of the heat-conducting material.

[0039] In step S1, the nano-titanium dioxide dispersion can be self-made or commercially available. The nano-titanium dioxide in...

Embodiment 1

[0050] Mix nano-anatase particles, silane coupling agent (model KH-570), and ethylene glycol, and form nano-anatase dispersion liquid after ball milling, stirring and ultrasonic dispersion. Among them, the nano-anatase particles are non-agglomerated, narrow particle size distribution, high crystallinity and isotropic nanoparticles prepared by the hydrothermal method after ion doping modification, and the particle size is 3nm to 50nm.

[0051] Add the dried PET chip or PET base material and silicon nitride thermally conductive filler (particle size 5-30μm) into the high-speed mixer according to the mass ratio, and mix at high speed for 10 minutes. After pre-mixing, pass the mixed material through the blast drying box again Dry in medium for 2h.

[0052] Feed to the twin-screw disperser, control the heating temperature of each zone of the twin-screw between 210°C and 280°C, after the solid PET is gradually melted, add the nano anatase dispersion in two times at the liquid feed p...

Embodiment 2

[0056] The difference from Example 1 is that the mass fraction of PET in Example 2 is 90%, the mass fraction of nano anatase titanium dioxide is 5%, and the mass fraction of silicon nitride thermally conductive filler is 5%. The Tg of PET polyester is 205°C, and the Tm is 236°C.

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Abstract

The invention provides a lithium battery insulating film and a preparation method thereof, the lithium battery insulating film comprises a polyester film, which comprises uniformly distributed nano titanium dioxide and a heat conduction material, wherein a part of the nano titanium dioxide coats the surface of the heat conduction material. The preparation method comprises the following steps: preparing a nano titanium dioxide dispersion liquid; mixing a polyester material and a heat-conducting material to melt the polyester material, and adding a nano titanium dioxide dispersion liquid into the heat-conducting material and the molten polyester material; carrying out cold casting to form a film, so that the nano titanium dioxide and the heat conduction material in the nano titanium dioxidedispersion liquid are dispersed in the polyester material, and part of the nano titanium dioxide coats the surface of the heat conduction material. The lithium battery insulating film can prevent short circuit outside the lithium battery shell, has better heat conduction characteristic, can reduce the use of auxiliaries, can shorten the manufacturing process, and improves the production line efficiency.

Description

technical field [0001] The present application relates to the technical field of energy storage devices, in particular to a lithium battery insulating film and a preparation method thereof. Background technique [0002] With the increasing environmental pollution, the new energy industry has attracted more and more attention. Lithium batteries are an important part of many electronic products, energy storage products and electric vehicles, and their performance will directly affect the promotion and use of related products. According to the classification of lithium battery outsourcing materials, lithium batteries can be mainly divided into two types: metal shell lithium batteries and soft pack batteries. [0003] For metal-case lithium batteries, many issues need to be considered during design and manufacture, such as the need to prevent short-circuiting of the external casing of metal-case lithium batteries; metal-case lithium batteries must have better heat dissipation pe...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08K3/34C08K3/22C08J5/18C09J7/25C09J7/38B82Y30/00B82Y40/00H01M2/34H01M10/052
CPCC08J5/18C09J7/255C09J7/385H01M10/052B82Y30/00B82Y40/00C08J2367/02C08K3/34C08K2003/2241C08K2201/011C08K2201/005C09J2203/33C09J2467/006H01M50/572Y02E60/10
Inventor 冯成伟崔立丰
Owner 湖南领湃达志科技股份有限公司
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